XMR-A OVERCURRENT AND EARTH FAULT PROTECTION RELAYS
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MORE eXtended MOdular RElays MORE ADVANCED, HIGH-END IEDs FOR PROTECTING, MONITORING AND CONTROLLING ELECTRIC POWER SYSTEMS.

XMR-A OVERCURRENT AND EARTH FAULT PROTECTION RELAYS XMR-A is a part of XMORE platform, the complete range of IEDs for Medium Voltage application including feeder, motor, generator, transformer and capacitor bank. Thanks to Hardware and Software modularity XMR-A is flexible and scalable in term of application and performance as: ► Overcurrent and Earth fault protection (Standard SW configuration) ► Additional double Earth Fault input for two-side Transformer protection (SW PAC Xtra Current) ► Additional Earth Fault Directional Overcurrent (SW PAC Xtra Voltage) ACCURATE MEASUREMENTS...

Thermal with Pt100 probes Undercurrent Negative sequence overcurrent Negative sequence overcurrent Thermal image Thermal image Max ratio Negative/ Positive Current Phase overcurrent Residual overcurrent Residual overcurrent Locked rotor Residual overvoltage Low impedance restricted earth fault Maximum number of startings (Restart inhibition) Ground directional overcurrent Reclosing relay Circuit breaker failure CT supervision Trip circuit supervision Lock-out Arcflash MEASURING INPUTS WITH INDUCTIVE CTS AND VTS ► Three phase current inputs and one residual current input, with nominal...

BLOCKING INPUT/OUTPUTS The output blocking circuits of one or several XMore relays, shunted together, must be connected to the input blocking circuit of the protection relay, which is installed upstream in the electric plant. The output circuit works as a simple contact, whose condition is detected by the input circuit of the upstream protection relay. CONTROL AND MONITORING Several predefined functions are implemented: Activation of four set point profiles Phase CTs monitoring (74CT) Logic selectivity Cold load pickup (CLP) with block or setting change Trip circuit supervision (74TCS)...

Automatic reclosing The automatic reclosure function is well-used on overhead lines (when faults are self-extinguish after tripping of protection relays). The following sequences may be selected: Rapid reclosure Rapid reclosure followed by one slow reclosure Rapid reclosure followed by one slow reclosure and one or more delayed reclosures (1...5) Starting of the automatic reclosing function can be raised by internal protective elements or externally by means binary input signals (eg: external protection device contacts or switches). Second harmonic restraint To prevent unwanted tripping of...

BLOCK INPUT (LOGIC SELECTIVITY) INPUT CIRCUITS Quantity 1 Type optocoupler AUXILIARY POWER SUPPLY UAUX Nominal value (range) PHASE CURRENT INPUTS WITH INDUCTIVE CTS Rated current In Permanent overload Thermal overload (1 s) Rated consumption (for any phase) Connections BLOCK OUTPUT (LOGIC SELECTIVITY) Quantity 1 Type optomosfet LEDS Quantity 21 ON/fail (green) 1 Start (yellow) 1 Trip (red) 1 Local 1 Remote 1 Allocatable (green/yellow/red) 16 RESIDUAL CURRENT INPUT Rated current IEn 1 A or 5 A selectable by sw Permanent overload 25 A Thermal overload (1 s) 500 A Rated consumption ≤ 0.006 VA...

P ROT E C T I O N FU N C T I O N S Full description about parameters, thresholds and timings ranges is available in relevant equipment documentation. BASE CURRENT IB [1] Base current (IB) For the CTs versions the basic current IB represents the rated current of the protected device (line, transformer, motor...) referred to the nominal current of the CT’s. If the secondary rated current of the line CT’s equals the rated current oft he relay, as usually happens, the IB value is the ratio between the rated current of the protected element and the CT’s primary rated current. STARTING CONTROL...

Definite time ► 51LR Second threshold definite time (ILR>>def) ► ILR>>def Operating time (tLR>>def) RESIDUAL OVERCURRENT - 50N/51N IE> Element ► IE> Curve type (IE>Curve) ► ICLP> Activation time (tECLP>) ► IE> Reset time delay (tE>RES) Definite time for CTs versions ► 50N/51N First threshold definite time (IE>def) ► IE>def Operating time (tE>def) Inverse time ► 50/51 First threshold inverse time (IE>inv) ► IE>inv Operating time (tE>inv) IE>> Element ► IE>> Reset time delay (tE>>RES) Definite time ► 50N/51N Second threshold definite time (IE>>def) ► IE>>def Operating time (tE>>def) IE>>>...

SECOND HARMONIC RESTRAINT - 2ndh-REST 79 Function mode (79 Mode) Rapid/Rapid+Slow Number of delayed reclosures (N.DAR) 0...5 Rapid reclosure dead time (trdt) 0.1...60 s Slow reclosure dead time (tsdt) 1...200 s Reclaim time (tr) 1...200 s Slow reclosure fault discrimination time (td1) 0...10 s Delayed reclosure fault discrimination time (td2) 0...10 s Manual close (R+S only) fault discrimination time (td) 1...10 s 79_X delayed timer 0.00...10.00 s 79_FR delayed timer 0.00...10.00 s Second harmonic restraint threshold (I2ndh>) I2ndh> Reset time delay (t2ndh>RES) BREAKER FAILURE - BF BF Phase...

BINARY INPUTS CURRENT INPUTS BINARY INPUTS OUTPUT RELAYS ANALOG INPUTS (Alternative) Note [1] two redundant ports with hw-sw switching selectable from TX + TX or FX + FX BINARY INPUTS

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VOLTAGE INPUTS Local Ethernet LINE SIDE

Factory: 35127 Padova IT Z.I. Sud - Via dell’artigianato, 48 T. +39 0498947701 F. +39 0498701390 Proudly made in Italy by Thytronic S.p.A.