XMR-A

XMR-A Motor and Feeder Protection Relay

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). 

TIME SYNCRONIZATION

Enhanced Time synchronization solution for SOE recording:

  • Precision Time Protocol PTP according to IEC1588
  • SNTP

COMMUNICATION SECURITY

Communication Security through redundancy protocol and Cyber Security package :

  • High available Seamless Redundancy support HSR
  • Parallel Redundancy Protocol support PRP
  • Rapid Spanning Tree Protocol RSTP
  • Advanced built in Cyber Security

NETWORK CONNECTIVITY

Widely implemented in Smart Grid and Substation Automation System:

  • IEC61850 Ed.1/Ed.2
  • IEC 870-5-103
  • Modbus (Serial/TCP)
  • DNP3 (Serial/TCP)

ACCURATE MEASUREMENT

Enhancements to protect and analyze power system operation in disturbance conditions:

  • Up to 5 analogue inputs
  • 32 sample for cycle Oscillography fault recording
  • 64 sample for cycle measurement for accuracy of protection element

FUNCTIONS


STANDARD PROTECTIVE & CONTROL ELEMENTS

  • Under Current - 37
  • Negative sequence overcurrent - 46LT
  • Negative /positive sequence current ratio - I2/I1
  • Thermal Image Transformer - 49LT
  • Phase overcurrent side H and side L - 50/51
  • Maximum Residual Overcurrent - 50N/51N(1)
  • Calculated Residual Overcurrent - 50N/51N (Comp)
  • Low impedance restricted earth fault - 64REF
  • Automatic Recloser - 79
  • Breaker Failure - BF
  • CT Supervision - 74CT
  • Trip Circuit Supervision - 74TCS
  • Remote TRIP
  • Second Harmonic Restraint
  • Multiple Profiles (A, B, C, D)
  • CEI 0-16

SW PACK OPTIONAL CONFIGURATION

  • Negative sequence overcurrent Motor/Generator - 46MG
  • Maximum Residual Overcurrent - 50N/51N(2)
  • Locked Rotor - 51LR(48)/14
  • Thermal Image Motor/Generator - 49MG
  • Maximum number of startings (Restart inhibition) - 66
HW PACK OPTIONAL CONFIGURATION
  • Thermal with Pt100 Probes - 26
  • Arc flash
  • Residual Overvoltage - 59N
  • Ground directional overcurrent - 67N

COMMUNICATION FUNCTIONS

  • Modbus TCP-IP
  • One Fibre Optic Ethernet port dedicated to IEC 61850
  • One Ethernet local RJ45 port for communication with ThyVisor setup software
  • DNP3 TCP-IP
  • IEC60870-5-103
  • IEC61850 Ed.1 & Ed. 2

DOWNLOADS

DNV XMR-P, XMR-A, XMR-D, XMR-T, XMR-V Server Ed2 Certificate
Brochure XMORE
Modules-XMore-Flyer_03-2025_EN
XMR - Dimensions and Cutout
XMR-A Coding Table
Flyer XMR-A

RELATED PRODUCTS

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.

...

> discover more