NA11

NA011 Feeder Protection Relay

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.

FUNCTIONS


STANDARD PROTECTIVE & CONTROL ELEMENTS

  • Phase overcurrent side H and side L - 50/51
  • Maximum Residual Overcurrent - 50N/51N(1)
  • Automatic Recloser - 79
  • Breaker Failure - BF
  • CT Supervision - 74CT
  • Trip Circuit Supervision - 74TCS
  • Sequence of event Recorder (SER)
  • Sequence of Fault Recorder (SFR)

SW PACK OPTIONAL CONFIGURATION

  • Digital Fault Recorder (DFR)
HW PACK OPTIONAL CONFIGURATION
  • Thermal with Pt100 Probes - 26

COMMUNICATION FUNCTIONS

  • Modbus TCP-IP
  • One USB Type B local port for communication with ThyVisor setup software
  • Modbus protocol RTU RS485 / IEC 870-5-103 / DNP3

DOWNLOADS

Flyer NA11
NA11 Coding
Manual NA11

RELATED PRODUCTS

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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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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