Protection Relays: All Thytronic Systems for Electrical System Protection

Thytronic protection relays provide a wide range of solutions for protection and monitoring of electrical power systems, ensuring the necessary safety, reliability, and efficiency for secure operation. Engineered with advanced technology, they respond promptly to faults or anomalies in the electrical network, preventing interruptions caused by untimely interventions and avoiding subsequent materialand economic damages. This ensures the safety of both personnel and equipment.

Thytronic relays are designed and manufactured to adapt to various power levels: reliable, efficient, and safe, they represent the complete solution to ensure the safety and efficiency of power electrical systems, for both industrial plants and distribution and transmission networks.

FEEDER PROTECTION RELAYS

Protection relays for distribution plants and transmission lines.

MOTOR PROTECTION RELAYS

Protection and control relays for asynchronous motors of all power levels, for any driving logic.

TRANSFORMER PROTECTION

Protection relays for power and distribution transformers with two or three windings.

GENERATOR PROTECTION RELAYS

Protection and control relays for generators of any power level in hydroelectric, steam, and thermal plants.

GRID INTERCONNECTION PROTECTION

Protection relays for connecting active and passive users to the distribution network, compliant with CEI 0-16 italian technical standards.

CAPACITOR BANK PROTECTION RELAYS

The specific solution for single or double capacitor banks with Wye grounding (or isolated from ground) and harmonic filters.

SECONDARY MEDIUM VOLTAGE PROTECTION RELAYS

Self-powered protection relays and advanced fault detectors designed for the protection and automation of medium voltage networks with any type of grounding.

EXPLORE THE UNIQUE FEATURES AND PRODUCTS OF THE XMORE FAMILY.

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Feeder protection Motor protection Transformer protection Generator protection General protection Capacitor bank protection Secondary MV protection Loss of mains protection

Feeder protection

NA011

The NA011 is a feeder protection relay that can be utilized in radial networks for protecting feeders or power transformers.
In solidly grounded systems, the Thytronic NA011 residual overcurrent protection relay can be used on feeders of any length. However, in ungrounded systems or those with a Petersen coil and/or resistance grounded systems, the residual overcurrent protection can be used on shorter feeders to prevent unwanted trippings due to the capacitive current contribution of the feeder during external ground faults.

The Thytronic NA011 feeder protection relay can be supplied with traditional CTs or low power (LPCT) current inputs. For both versions, the residual current can be directly measured (using CTs or a balanced transformer) or calculated via vector sum of the three-phase currents.

Features of the NA011 Protection Relay


The Thytronic NA011 protection relay offers a range of features to ensure optimal safety and control. These include automatic reclosure for a timely and efficient handling of interruption events, supervision of circuit breaker failure, and monitoring of maximum residual and phase overcurrents to guarantee comprehensive and reliable protection. Additionally, the relay is equipped with the Modbus RTU RS232 protocol. The use of Thyvisor software ensures quick and easy programming, setting, and management of the relay.

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NA11

The NA011 is a feeder protection relay that can be utilized in radial networks for protecting feeders or power transformers.
In solidly grounded systems, the Thytronic NA011 residual overcurrent protection relay can be used on feeders of any length. However, in ungrounded systems or those with a Petersen coil and/or resistance grounded systems, the residual overcurrent protection can be used on shorter feeders to prevent unwanted trippings due to the capacitive current contribution of the feeder during external ground faults.
The Thytronic NA011 feeder protection relay can be supplied with traditional CTs or low power (LPCT) current inputs. For both versions, the residual current can be directly measured (using CTs or a balanced transformer) or calculated via vector sum of the three-phase currents.

Features of the NA011 Protection Relay


The Thytronic NA011 protection relay offers a range of features to ensure optimal safety and control. These include automatic reclosure for a timely and efficient handling of interruption events, supervision of circuit breaker failure, and monitoring of maximum residual and phase overcurrents to guarantee comprehensive and reliable protection. Additionally, the relay is equipped with the Modbus RTU RS232 protocol. The use of Thyvisor software ensures quick and easy programming, setting, and management of the relay.

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NA20

The NA20 protection relay ensures ssafety of radial networks. In solidly grounded systems, it provides protection against faults on lines of any length. In isolated or Petersen coil and/or resistance grounded systems, it ensures protection on shorter lenghts, to avoid unwanted trippings due to the capacitive current contribution of the feeder on external ground fault.

Features of the NA20 Protection Relay


Thytronic NA20 protection relay provides advanced protection features such as thermal imaging to ensure the safety of lines and power transformers, Undercurrent protection for monitoring of circuit breaker opening,, and negative sequence protection against asymmetrical short circuits and unbalanced loads,. Additionally, the I2/I1 protection functions allow intervention in phase interruptions under low-load conditions.

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NA21

The NA21 protection relay ensures safety of radial networks In solidly grounded systems, it provides reliable protection against faults on lines of any length. In isolated or Petersen coil and/or resistance grounded systems, it offers protection on shorter lenghtsto avoid unwanted interventions to the
capacitive current contribution of the feeder on external ground fault.


Features of the NA21 Protection Relay


In addition to phase and residual overcurrent protection, the following features are included:
  • Thermal imaging for line and transformer protection,
  • Undercurrent protection for monitoring of Circuit Breaker opening.
  • Negative sequence protection against asymmetrical short circuits and unbalance loads.,
  • I2/I1 protection against phase interruptions (interruption with reduced load line),
  • Automatic Reclosing

The NA21 relay also integrates thermal imaging for the protection of lines and transformers. With optional hardware and software configurations, features such as temperature measurement using Pt100 thermometric probes can be included. For communication and configuration, the NA21 relay is equipped with a Type B USB port to connect to the ThyVisor configuration software, allowing easy and fast configuration and system management.

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XMR-A

XMR-A is part of the XMORE platform, the comprehensive range of IEDs for medium voltage applications that includes protection for feeders, motors, generators, transformers, and capacitor banks. The Thytronic XMR-A IED complies with CEI-016 standards. Thanks to its hardware and software modularity, XMR-A is flexible and scalable in terms of applications and performance. 

Features of the XMR-A Protection Relay

The XMR-A relay is used in power distribution grids with any state of the neutral (insulated, earthed with high or low resistance, earthed with Petersen coil (compensated neutral) and any resistance, directly connected to earth) for the following typical applications:
  • protecting radial lines, transformers
  • as a CEI 0-16 certified General Protection System (SPG) for active or passive users connected to the public distribution network, with possible directional earth protection 67N (with optional HW package).
The following measurement circuits are present:
  • Versions with inputs from CT
  • Three phase currents with rated current independently selectable at 1A or 5 A via software
  • One residual current input with rated current selectable at 1A or 5 A via software.
Optionally:
  • One additional residual current input with rated current selectable at 1A or 5 A via software.
Or
  • A residual voltage input, with rated voltage programmable in the range 50...130V (UEn = 100V)
To integrate the protection functions, there are the functions of failure to open the circuit-breaker (BF), CT monitoring (74CT), VT monitoring (74VT), trip circuit monitoring (74TCS), synchronism control and programmable logic (PLC).
The methods of calibration, programming and reading of the measurements and recordings can be implemented through Personal Computer with Software support ( ThyVisor) or via bus RS485 or Ethernet communication; all the above operations are possible using the keyboard frontal view (MMI). 

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XMR-P

XMR-P is part of the XMORE platform, a complete range of IEDs for medium voltage applications that includes feeders, motors, generators, transformers, and capacitor banks. Thanks to its hardware and software modularity, XMR-P is flexible and scalable in terms of applications and performance.
 

Features of the XMR-P Protection Relay

The XMR-P multifunction relay is used in power grids with any neutral state (isolated, earthed with high or low value resistance, earthed with Petersen coil (compensated neutral) and any resistance, directly connected to earth) for the following typical applications:
  • Protection of radial lines, transformers
  • As a CEI 0-16 certified General Protection System ( SPG), with measurement inputs from inductive CT-VT or from ThySensor
  • Disconnection of self-producers from the electrical distribution network (LoM - Loss of Main); in particular, the version with inputs from ThySensor, is CEI 0-16 certified as SPG (general protection system) and integrated SPI (interface protection system).
With optional SW package, it is also possible to extend its application to:
  • Loop lines or long radial lines, generators or transformers in parallel, thanks to directional phase (67) and ground (67N) protections
  • For directional monitoring of active and/or reactive power
  • As multifunctional motor or generator protection.

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DMC900A3S0

Thytronic Protection and Control Panels can be mounted both on the MV section supports and on the HV user line of Primary Substations. These devices are applicable not only in medium voltage nodes but also in primary substations with a grounded neutral or with a very low-value neutral resistor in foreign countries where ENEL is present.

Features of the DMC900A3S0 Automatic Control Panel

In addition to protection functions, the DMC900A3S0 automatic control panel provides monitoring and control funcionts such as CT Supervision(74CT),  VT supervision (74VT), trip circuit supervision (74TCS), Syncrocheck function, frequency protection EAC (Automatic Load Balancer), programmable logic (PLC), and automatic reclosing (79).
Calibration, programming, and reading of measurements and recordings can be managed via a PC with ThyVisor support software or through an Ethernet communication bus. All these operations can also be performed through the front keyboard (MMI). Additionally, up to 2 external RIO DMRIS0 modules can be integrated. The system complies with ENEL DMI 900016 and GSTP101 standards, as well as cybersecurity standards. Moreover, an upgrade kit is available for ENEL panels,  to comply  with the latest Enel specifications.

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Motor protection

NM10

The NM10 protection relay is ideal for protecting small and medium-sized motors on radial MT and BT networks. It can be used on lines of varying length in systems with solidly grounded or low-resistance grounded neutrals, as well as on shorter lines in systems with isolated neutrals, Petersen coils, or high-resistance grounding.

Features of the NM10 Motor Protection Relay


The Thytronic NM10 protection relay offers a comprehensive set of features to ensure the safety and reliability of motors and generators. Its standard protection and control characteristics include monitoring of under current, maximum reverse sequence current, as well as a specific thermal image function for motors and generators. Additionally, it includes monitoring of maximum phase and residual overcurrent, the ability to lock the rotor, and management of the maximum number of starting with the possibility of inhibiting restart. The device includes functions such as management of circuit breaker failure, CT supervision, and supervision of the trip circuit. Hardware and software configuration options also offer the possibility of integrating the thermal protection function for measuring machine temperature via Pt100 thermometric probes.

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NM20

The NM20 protection relay can be used for protecting large asynchronous and synchronous motors on MT networks, applicable for lines of any length in systems with isolated neutrals, solidly grounded, Petersen coil and/or resistance grounded.

Features of the NM20 Motor Protection Relay

Its standard and control features include management of undervoltage and positive sequence undervoltage, directional active underpower, and regulation of under current It also offers detection of loss offield, Negative sequence overvoltagefor motors and generators, control of the maximum number of startings with the possibility of inhibiting restart, and ground directionality.
Thytronic's NM20 relay also monitors over- and underfrequency, breaker operation, and the trip circuit. Additionally, it provides the option to integrate thermal protection function 26 for measuring machine temperature via Pt100 thermometric probes. Hardware and software configuration options offer further customization possibilities.

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XMR-A

XMR-A is part of the XMORE platform, the comprehensive range of IEDs for medium voltage applications that includes protection for feeders, motors, generators, transformers, and capacitor banks. The Thytronic XMR-A IED complies with CEI-016 standards. Thanks to its hardware and software modularity, XMR-A is flexible and scalable in terms of applications and performance. 

Features of the XMR-A Protection Relay

The XMR-A relay is used in power distribution grids with any state of the neutral (insulated, earthed with high or low resistance, earthed with Petersen coil (compensated neutral) and any resistance, directly connected to earth) for the following typical applications:
  • protecting radial lines, transformers
  • as a CEI 0-16 certified General Protection System (SPG) for active or passive users connected to the public distribution network, with possible directional earth protection 67N (with optional HW package).
The following measurement circuits are present:
  • Versions with inputs from CT
  • Three phase currents with rated current independently selectable at 1A or 5 A via software
  • One residual current input with rated current selectable at 1A or 5 A via software.
Optionally:
  • One additional residual current input with rated current selectable at 1A or 5 A via software.
Or
  • A residual voltage input, with rated voltage programmable in the range 50...130V (UEn = 100V)
To integrate the protection functions, there are the functions of failure to open the circuit-breaker (BF), CT monitoring (74CT), VT monitoring (74VT), trip circuit monitoring (74TCS), synchronism control and programmable logic (PLC).
The methods of calibration, programming and reading of the measurements and recordings can be implemented through Personal Computer with Software support ( ThyVisor) or via bus RS485 or Ethernet communication; all the above operations are possible using the keyboard frontal view (MMI). 

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XMR-P

XMR-P is part of the XMORE platform, a complete range of IEDs for medium voltage applications that includes feeders, motors, generators, transformers, and capacitor banks. Thanks to its hardware and software modularity, XMR-P is flexible and scalable in terms of applications and performance.
 

Features of the XMR-P Protection Relay

The XMR-P multifunction relay is used in power grids with any neutral state (isolated, earthed with high or low value resistance, earthed with Petersen coil (compensated neutral) and any resistance, directly connected to earth) for the following typical applications:
  • Protection of radial lines, transformers
  • As a CEI 0-16 certified General Protection System ( SPG), with measurement inputs from inductive CT-VT or from ThySensor
  • Disconnection of self-producers from the electrical distribution network (LoM - Loss of Main); in particular, the version with inputs from ThySensor, is CEI 0-16 certified as SPG (general protection system) and integrated SPI (interface protection system).
With optional SW package, it is also possible to extend its application to:
  • Loop lines or long radial lines, generators or transformers in parallel, thanks to directional phase (67) and ground (67N) protections
  • For directional monitoring of active and/or reactive power
  • As multifunctional motor or generator protection.

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Transformer protection

XMR-T

The XMR-T relay is part of the XMORE platform, the complete range of IEDs for medium voltage applications. Thytronic's XMR-T is the complete solution for the protection of two or three winding transformers.

Features of the XMR-T Protection Relay for Transformers


The Thytronic XMR-T transformer protection relay is an advanced solution designed to ensure the safety of transformers. Its features include remarkable accuracy in measurements, allowing up to 12 analog inputs and detailed recording of 32 samples per cycle during faults, ensuring reliable protection under disturbance conditions. Communication security is assured through redundancy protocols such as HSR, PRP, and RSTP, along with robust integrated cybersecurity measures. An advanced time synchronization solution, including the PTP protocol as per IEC1588 and SNTP, provides high precision in event logging. The relay is broadly compatible with Smart Grid networks and substation automation systems, adopting protocols such as IEC61850, IEC 870-5-103, Modbus, and DNP3.
Its protection and control functions include a wide range of parameters, including maximum and minimum currents and voltages, frequency monitoring, remote trip, ensuring complete and customized protection. Thanks to hardware and software modularity, different functionalities can be integrated according to specific needs

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Generator protection

NG20

The digital NG20 protection relay includes several functions required for the protection of synchronous generators or non-self-starting synchronous motors.

Features of the NG20 Generator Protection Relay


The Thytronic NG20 protection relay for generators offers several fundamental functions to ensure the safety of generators. Among its standard protection and control functions are the monitoring of phase overcurrent, overfrequency, and residual overvoltage, ensuring the stability of key parameters. Voltagecontrolled / restraint supervision , along with residual current monitoring, guarantees comprehensive protection.

The detection of minimum and maximum voltages, frequencies, and currents, along with the control of directional active underpower and loss offield, ensures optimal generator operation. Optionally, the relay offers advanced hardware and software configurations, such as thermal measurement of machine temperature via Pt100 thermometric probes. Communication is simplified through a type B USB port, allowing easy configuration via the ThyVisor software, ensuring effective monitoring and control of the system.

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XMR-D

The XMR-D is part of the XMORE platform, a comprehensive range of IEDs for medium voltage applications that includes power supplies, motors, generators, transformers, and capacitor banks. The Thytronic IED XMR-D is a complete multifunctional relay for the protection of motors and generators, including the differential element. Thanks to its hardware and software modularity, the XMR-D is flexible and scalable in terms of applications and performance.

Features of the XMR-D Protection Relay for Generators


Equipped with a wide range of standard features, the XMR-D relay for generator protection provides complete protection through the supervision and control of crucial parameters such as maximum phase current, frequency, residual voltage, and many other variables essential for the proper functioning of the generator. This relay also integrates an advanced communication security system, utilizing redundancy protocols and built-in cybersecurity to ensure high reliability and data protection. Moreover, with an advanced time synchronization solution, it allows accurate recording of event sequences (SOE).

Network connectivity includes various implementations of protocols widely used in Smart Grids and substations, making it compatible with multiple environments and automation systems. The protection and control functionalities are extremely detailed and include various measures, such as maximum directional active power, trip circuit supervision, and many others, providing complete and customized protection for the generator. Additional hardware and software configuration options offer further levels of control and customization, including thermal functions through Pt100 thermal probes, the Arc Flash function, and other optional elements to enhance the safety and efficiency of the system.

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XMR-P

XMR-P is part of the XMORE platform, a complete range of IEDs for medium voltage applications that includes feeders, motors, generators, transformers, and capacitor banks. Thanks to its hardware and software modularity, XMR-P is flexible and scalable in terms of applications and performance.
 

Features of the XMR-P Protection Relay

The XMR-P multifunction relay is used in power grids with any neutral state (isolated, earthed with high or low value resistance, earthed with Petersen coil (compensated neutral) and any resistance, directly connected to earth) for the following typical applications:
  • Protection of radial lines, transformers
  • As a CEI 0-16 certified General Protection System ( SPG), with measurement inputs from inductive CT-VT or from ThySensor
  • Disconnection of self-producers from the electrical distribution network (LoM - Loss of Main); in particular, the version with inputs from ThySensor, is CEI 0-16 certified as SPG (general protection system) and integrated SPI (interface protection system).
With optional SW package, it is also possible to extend its application to:
  • Loop lines or long radial lines, generators or transformers in parallel, thanks to directional phase (67) and ground (67N) protections
  • For directional monitoring of active and/or reactive power
  • As multifunctional motor or generator protection.

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General protection

NA016

The Thytronic NA016 relay, which meets the requirements of the Italian standard CEI 0-16, is typically used in HV, MV and LV radial networks as protection of power supplies or power transformers. In solidly grounded systems the residual overcurrent protection can be used on lines of any length, while in systems with an isolated neutral, i.e., connected to ground via Petersen coil and/or resistor, residual overcurrent protection can be used on lines of limited length so as to avoid untimely tripping due to capacitive current contribution of the feeder on external ground fault.

Features of the NA016 general protection relay


Thytronic NA016 relay monitors maximum residual and phase current, ensuring system safety against overloads. It is for users who do not require directional protections (51-50-51N-50N) and logic selectivity, itoffers trip circuit supervision. In addition, a version equipped with a shunt trip release with built-in DATA LOGGER is available. As for communication functions, the device is equipped with Modbus RTU RS232 protocol.

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NA10

Thytronic's NA10 relay is used on radial-type networks to protect power lines and transformers and can be used as general protection forusers connected to the MV distribution network in accordance with CEI 0-16, in applications where maximum current and ground fault protection functions are provided. In systems with a grounded neutral, it provides reliable protection against ground faults on lines of any length. In systems with an isolated neutral, where the connection to ground is made through Petersen coil or resistor, ground-fault protection, on the other hand, is employed only on lines of limited length. This approach avoids untimely tripping due to the contribution of the line's capacitive current to external faults.

Features of the NA10 general protection relay


Standard protection and control functions of the Thytronic NA10 relay include maximum phase current and residual current monitoring, ensuring complete protection against overloads and faults. The breaker failureand phase overcurrent funtions  contribute to system safety and control. In addition, the relay offers trip circuit supervision and meets the requirements of the Italian standard CEI 0-16, ensuring operation in accordance with safety standards.

Optionally, the integration of protection function 26 for machine temperature measurement using Pt100 thermometer probes is available. Regarding communication functions, the relay is equipped with a USB type B port, facilitating communication with ThyVisor configuration software for easy configuration and effective system monitoring.

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NA30

The NA30 protection relay is used in radial MV networksas feeder or power transformer protection. . It is suitable for long feeders in ungrounded systems or with  Petersen coil and/or high resistance grounded systems, while, on the LV side of transformers in parallel, with any neutral grounding system.
Relay NA30 can be used as general protection of users connected to the MV distribution network in accordance with the Italian standard CEI 0-16in applications where the functions of maximum current and directional earth protection are provided. 

Features of the NA30 general protection relay


Standard protection functions and control elements of the Thytronic NA30 protection relay include thermal imaging for Line/Transformer, phase overcurrent, maximun residual overcurrent and residual overvoltage, along with ground directional overcurrent. In addition, the relay offers breaker failure detection, phase current transformer monitoring, and trip circuit supervision. 

Optionally, a hardware package is available for protection function 26 for machine temperature measurement via Pt100 thermometer probes. Additional hardware and software configurations can be integrated according to specific requirements. The relay is also equipped with a USB Type B port for easy connection to ThyVisor configuration software, simplifying system management and monitoring.

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NA60

The NA60 protection relay can be used on radial and/or meshed MV and LV networks, providing reliable protection for power lines and transformers. It offers protection on radial, ring or parallel lines of any length in systems with a grounded, ungrounded, Petersen coil and/resistance grounded systems.
It also provides effective ground fault protection for generators connected directly to the same busbar. Undervoltage and overvoltage functions are integrated as voltage protection or control, ensuring optimal system operation. The relay can be supplied with phase current input circuits suitable for both conventional CT and TV or combined Thysensor devices. Both versions are certified for use as general protection of users connected to the MV distribution network in accordance with the Italian standards CEI 0-16 in applications where maximum directional and non-directional phase and directional earth current protection functions are provided.

Features of the NA60 general protection relay


The Thytronic NA60 protection relay has several functions designed to ensure the safety of power lines and transformers. These standard protection and control functions include under voltage monitoring, thermal imaging for Line/Transformer, and phase overcurrent, residual overvoltage and overcurrent monitoring. The relay is also capable of handling directional phase overcurrent, as well as offering ground directional overcurrent and detecting failure to open the breaker.

In addition, the NA60 relay provides CT and VT  phase line monitoring, as well as trip circuit supervision. Optionally, a hardware package is available for protection function 26 to measure machine temperature using Pt100 thermometer probes.  The relay also has a USB type B port to facilitate communication with ThyVisor configuration software.

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NV10B

The Thytronic NV10B relay is typically used in HV, MV, and LV for the protection of networks and electrical machines, load shedding, and loss of main protection

Features of the NV10B General Protection Relay


The standard protection and control functions of the Thytronic NV10B protection relay include detection of circuit breaker failure, monitoring of residual overvoltage and overvoltage, supervision of the trip circuit, control of under voltage, and thermal function with Pt100 thermometric probes.
Optionally, the relay offers software (SW PACK) and hardware (HW PACK) packages and is equipped with a type B USB port that allows connection with the ThyVisor configuration software.

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MODEM GSM-4

M-GSM4 modems enable the implementation of remote control of Thytronic protection relays via GSM/GPRS/LTE mobile network up to and including 4G technology. Specifically, in combination with NV10P protection relay,they enable control of the opening and closing of interface devices installed via digital I/Os. Modem GMS-4 can be installed on photovoltaic and wind renewable generation systems having a total rated power greater than or equal to 100 kW, in compliance with the provisions contained in Annex M of CEI 0-16 Standard ed. 09-2014, CEI 0-16 Standard ed. 12-2014 V1, Resolution 421/2014/R/EEL 07-8-2014 and Annex A72 8-2014 and subsequent editions.

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Capacitor bank protection

NC020

In recent years, the portion of the total load that produces harmonics has steadily increased due to the massive use of power electronics at all voltage levels. Thyristor converters, frequency converters, switching thyristors, and static compensators, such as Thyristor-Controlled Reactors (TCR) and Thyristor-Switched Capacitors (TSC), are commonly adopted in industrial applications and electrical utilities.


Capacitor bank filters consist of capacitor batteries and an air core connected in series, whose task is to absorb the harmonic currents generated by loads and all the above-mentioned power electronic devices. The purpose of the NC020 protection relay is to provide reliable protection for such an application, ensuring the system's safety.

Features of the NC020 Capacitor Bank Protection Relay


The Thytronic NC020 protection relay is designed to ensure reliable protection for capacitor banks. Its key functions include detection of breaker failure, monitoring of negative sequence overcurrent of the transformer, and control of the maximum voltage and phase current. This relay supports the Modbus RTU RS232 communication protocol.

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NC20

The NC20 protection relay can be used to protect shunt capacitor banks and harmonic filter circuits. The capacitor banks can have the following configuration:

  • Single Wye grounded.
  • Single Wye ungrounded (with a resistor on the output of the neutral unbalance voltage transformer in order to develop the appropriate input current for the unbalance protection)
  • Double Wye ungrounded.
The capacitor banks may be: internally/externally fused or fuseless capacitor units.The protections are equipped with a system for compensating inherent unbalance neutral current
  • Protections 37, 49, and 50/51 (RMS) are based on the measurement of the true RMS value of the three phase currents (fundamental and harmonics up to the11th). 

Features of the NC20 Capacitor Bank Protection Relay


Among the functions of the Thytronic NC20 relay, we find the monitoring of under voltage and under current, along with the control of the negative sequence overcurrent r, phase overcurrent, and maximum residual overcurrent, in addition to the supervision of overvoltage and detection of breaker failure.

The relay is capable of monitoring the phase current transformers and supervising the trip circuit to ensure reliable operation. Additionally, it optionally offers a hardware (HW PACK) and software (SW PACK) package for advanced configurations.
Regarding communication functions, it is equipped with a type B USB port for easy connection to the ThyVisor configuration software.

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XMR-C

The XMR-C relay is designed for the protection, measurement, and supervision of capacitor banks and harmonic filters. Capacitor bank filters consist of capacitor batteries and air-core inductors connected in series, with the function of absorbing harmonic currents generated by loads and power electronic devices.
  • Possible configurations for capacitor banks are:
  • Single with star grounded or ungrounded 
  • Double with star grounded or ungrounded
  • Delta
  • H configuration 
The capacitor banks may be equipped with internally externally fused or unfused capacitor units.

A suitable compensation method is provided by the protection relay to compensate the inherent unbalance neutral current, while protections 37, 49, 59H, and 50(rms)/51(rms) are based on the RMS measurement of the three phase currents ( fundamental and harmonics up to the 50th).

  • The measuring circuits present are:
  • Three phase currents and one neutral imbalance current input, with nominal current selectable at 1A or 5A via software programming.
Three phase voltages, with nominal voltage programmable in the range 50...130V (UR=100V) and one residual voltage input with nominal voltage programmable in the range 50...130V (UER=100V).

In addition to protection functions, the device offers breaker failure (BF) functions, CT supervision (74CT), VT supervision (74VT), trip circuit monitoring (74TCS), and programmable logic control (PLC).

Calibration, programming, and reading of measurements and recordings can be performed via a PC with ThyVisor software through the front or rear Ethernet communication bus. All operations can also be executed via the front keyboard (MMI).

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Secondary MV protection

SME2-IS (RGDM-I)

Fault detection device for indoor use with functions of maximum current, earth directional, maximum active power directional , reclosing, presence/absence of voltage, and synchronized control. Compliant with ENEL GSTP011 standards and cybersecurity.
H2: Features of the Secondary Protection System MT SME2-IS (RGDM-I)
The SME2-IS fault detectors are designed in compliance with ENEL GETP011 specification (Protection and control device for MV substation – RGDM control unit). They are installed in remotely controlled secondary substations to detect phase-to-phase and ground faults in both isolated and compensated neutral networks without needing configuration changes when switching network setups and independently of the power feed direction. Specifically, they enable:
  • Detection of multi-phase and single-phase ground faults 
  • Detection of line undervoltage
  • Measurement of voltage and active/reactive power on the MV line 
  • Control of DY800 opening and closing during faults or remotely from UP 
  • Interface with generators present on the MV network to coordinate voltage regulation along the line and remote disconnection signals 
  • Coil current measurement
The input circuits are suitable for measurement acquisition via integrated phase current/voltage sensors. The device can, through software selection, acquire current measurement signals from active sensors (signal proportional to the current value transduced by the sensor) or passive sensors (DJ 5400 and GSTC005 - signal proportional to the current derivative value over time). The device allows current and voltage measurements through Low Power sensors compliant with IEC 61869-10 and IEC 61869-11.

The homopolar values are calculated vectorially from the measured phase currents and voltages. Voltage measurement inputs are available with capacitive voltage dividers.

Additionally, two Ethernet communication ports are available, one with IEC61850 protocol.
To ensure full compatibility with RTUs already present in secondary installations, the SME2-IS device is equipped with a dual interface, capable of communicating with both the UP (DX1215) and future communication devices. Calibration, programming, and reading of measurements and recordings can be done through a Personal Computer or via Ethernet communication port with software (ThyVisor) available for free. All the above operations are also possible using the front keyboard (MMI).

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SME70 (RGDAT INDOOR)

The SME71R fault detection system is designed in compliance with the ENEL GSTP001 specification and is installed in indoor applications to provide local and remote signaling of short circuits and earth  faults that may occur in medium voltage distribution networks. The SME71R quickly locates the faulted line section, thereby reducing power outages.

Features of the Medium Voltage Secondary Protection Device SME71R (RGDAT INDOOR)


The SME71R devices are installed in remotely controlled secondary stations to provide local and remote signaling of short circuit and earth faults that may occur in medium voltage distribution networks. These devices quickly identify the line section affected by faults, thus reducing power outages.
The SME71 INDOOR family of devices can operate with:
  • Insulated neutral
  • Grounded neutral through an inductor with a parallel resistor
  • Grounded neutral through a resistor
  • Directly grounded neutral
The SME71 INDOOR family detects faults between faults  and earth faults in both isolated and compensated neutral networks without needing to change settings between different configurations and independently of the power feed direction. Accurate fault direction detection occurs even with intermittent faults. The SME71 INDOOR family monitors the voltage of the three phases of the medium voltage line and signals whether it is ON or OFF. A current converter with a 4...20 mA output is also available to send the phase current measurement to the remote control terminal.

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SME70-O (RGDAT OUTDOOR)

The SME71-O fault detection system is designed in compliance with the ENEL GSTP001 specification and is installed in outdoor applications to provide local and remote signaling of short circuits and earthfaults that may occur in medium voltage distribution networks. The SME71-O quickly locates theline section affected by faults, thereby reducing power outages.

Features of the Medium Voltage Secondary Protection Device SME70-O (RGDAT OUTDOOR)


The SME71-O can operate with:
  • Insulatedneutral
  • Grounded neutral through an inductor with a parallel resistor
  • Grounded neutral through a resistor
  • Directly grounded neutral
The SME71-O device detects faults between phases  and earthfaults in both isolated and compensated neutral networks without needing to change settings between different configurations and independently of the power feed direction. Accurate fault direction detection occurs even with intermittent faults. The SME71-O device monitors the voltage of the three phases of the medium voltage line and signals whether it is ON or OFF. A current converter with a 4...20 mA output is also available to send the phase current measurement to the remote control terminal.

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Loss of mains protection

NV10P

The Thytronic NV10P protection relay, compliant with CEI-016 standards, can be typically used in HV, MV, and LV distribution systems, on transformers or for electric machines. It can be used for system decoupling, load shedding, and loss of main protection. 

Features of the NV10P Interface Protection Relay


The Thytronic NV10P interface protection relay has various functions to ensure reliable and precise protection in electrical systems. It fulfills functions of monitoring over- and undervoltage, measures residual overvoltage, negative sequence overvoltage, and frequency, both minimum and maximum, including frequency rate of change. This relay ensures the detection of circuit breaker failure and accurate supervision of the trip circuit, providing protection in compliance with CEI 0-16 standards. For communication functions, it is equipped with a type B USB port to facilitate connection and configuration via the ThyVisor software.

In combination with the NV10P relay, as an alternative to 
traditional voltage
transformers and insulators with capacitor divider, , V-Sensor can be installed in Medium Voltage Electric Panels for phase voltage measurement. These devices include the functions of:
  • Electronic Voltage Transformer
  • Capacitive divider for voltage presence lamps 
  • Insulator.
The sensor is offered in a single model suitable for installations with nominal voltage 10...24 kV and does not require the installation of  anti-ferroresonance resistors. 
Furthermore, for the remote control of the relay, it is possible to install the M-GSM4 modem with mobile GSM technology up to and including 4G, GPRS, and LTE, which allows for the command of opening and closing of the interface devices installed on generation plants with a total nominal power ≥ 100 kW.

Moreover, in plants where automatic reclosing (ARF) is active, by connecting the M-GSM4 Thytronic modem to the NV10P protection relay via ThyBus, the interventions for modification on the plant are minimized.

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XMR-V

The Thytronic XMR-V protection relay, compliant with the Italian CEI-016 regulations, is part of the XMORE platform, the complete range of IEDs for medium voltage applications. XMR-V is ideal for protection against power supply failure from the distribution network and Loss of Main voltage.. Thanks to the modularity of the hardware and software, the XMR-V is flexible and scalable in terms of applications and performance.

Features of the XMR-V Interface Protection Relay


The Thytronic XMR-V interface protection relay offers a range of high-precision features, with recording capabilities in Oscillography of up to 32 samples per cycle during faults and 64 samples per cycle, enhancing the accuracy of protection elements. It is widely implemented in Smart Grids and substation automation systems, supporting communication standards such as IEC61850 Ed.1/Ed.2, IEC 870-5-103, Modbus (Serial/TCP), and DNP3 (Serial/TCP).

Communication security is ensured through redundancy protocols such as HSR and PRP, along with advanced integrated cybersecurity to protect networks. The solution also provides enhanced time synchronization for SOE logging, supporting precision protocols such as PTP according to IEC1588 and SNTP. XMR-V performs synchronization control, monitors voltage, frequency and frequency rate of change , detectsbreaker failure, offers remote tripping functionality, multiple regulation profiles, and vectorjump. Optionally, hardware and software packages are available for custom configurations and additional functionalities.

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NV021

The Thytronic NV021 protection relay, compliant with the Italian standard CEI 0-21 is typically used in LV distribution systems, on transformers, or for electric machines. It can be used for system decoupling, load shedding, and loss of main protection.

Features of the NV021 Interface Protection Relay


The Thytronic NV021 interface protection relay offers a range of advanced features to ensure reliable and precise protection in electrical systems. It monitors both under-  and over voltage, along with residual overvoltage and negative sequence voltage, ensuring accurate measurement of frequencies, both minimum and maximum, and the frequency derivative. The relay is designed to detect breaker gailure  and to accurately supervise the trip circuit for reliable operation.

The NV021 relay also provides a protection function 26 for measuring machine temperature via Pt100 thermometric probes. For communication purposes, the NV021 is equipped with a type B USB port for connection with the ThyVisor configuration software, simplifying the management and configuration of the relay.

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