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XMR-A OVERCURRENT AND EARTH FAULT PROTECTION RELAYS

XMR-A OVERCURRENT AND EARTH FAULT PROTECTION RELAYS

Product catalog summary

Overview: The XMR-A is a component of the XMORE platform, tailored for medium voltage applications such as feeder, motor, generator, transformer, and capacitor bank protection. It features modular hardware and software for adaptable overcurrent and earth fault protection.

Key Features:

Protection Functions: Offers standard and directional overcurrent protection, along with motor protection options.
Modularity: Expandable hardware with plug-in modules and customizable software packs.
Time Synchronization: Utilizes Precision Time Protocol (PTP) and SNTP for precise event logging.
Communication Security: Includes redundancy protocols and advanced cybersecurity measures, compliant with NERC CIP and ISO/IEC 27001:2013.
Network Connectivity: Supports IEC61850, Modbus, and DNP3 protocols for smart grid and substation automation integration.
Automation and Monitoring: Provides tools for grid automation, switchgear control, and health monitoring of circuit breakers and CTs.

Specifications:

Mechanical Data: Suitable for flush or rack mounting, with a mass of 5 kg for flush mounting cases.
Insulation and EMC Tests: Meets standards for high voltage, impulse voltage, and electromagnetic compatibility.
Environmental Conditions: Operates between -25 to +70°C, with storage temperatures from -40 to +85°C.
Certifications: CE conformity and compliance with EMC and Low Voltage Directives.

Advanced Features:

Automatic Reclosing: Supports multiple reclosing sequences for overhead lines.
Second Harmonic Restraint: Prevents unwanted tripping during transformer inrush currents.
Self Diagnostics: Continuously monitors hardware and software, reporting anomalies through various interfaces.
Event Storage: Non-volatile memory for storing events and faults for diagnostics.
Cybersecurity: Implements secure communication and access control to mitigate cyber threats.

Power Supply Specifications: Operative range: 19...132 V AC/DC, 75 V AC/DC to 300 V AC. Maximum power consumption: 25 W (35 VA) for energized relays and Ethernet FX.

Phase Current Inputs: Rated current: 1 A or 5 A, selectable by software. Permanent overload: 25 A; Thermal overload (1 s): 500 A. Rated consumption: ≤ 0.002 VA (In = 1 A), ≤ 0.04 VA (In = 5 A).

Residual Current Input: Rated current: 1 A or 5 A, selectable by software. Permanent overload: 25 A; Thermal overload (1 s): 500 A. Rated consumption: ≤ 0.006 VA (IEn = 1 A), ≤ 0.012 VA (IEn = 5 A).

Residual Voltage Input: Reference voltage: 100 V; Nominal voltage: 50...130 V adjustable via software. Permanent overload: 1.3 UEn; 1s overload: 2 UEn. Rated consumption: ≤ 0.5 VA.

Binary Inputs: Quantity: 7 to 53; Type: dry inputs. Max permissible voltage: 19...265 Vac/19...300 Vdc. Max consumption when energized: 3 mA.

Output Circuits: Output relays quantity: 7 to 31. Rated current: 8 A; Rated voltage/max switching voltage: 250 Vac/400 Vac. Short duration current (0.5 s): 30 A; Minimum switching load: 300 mW (5 V/5 mA).

Relay Settings: Nominal frequency: 50, 60 Hz. Residual nominal current: 1 A, 5 A. Nominal voltage (phase-to-phase): 50...130 V or 200...520 V. Nominal voltage (phase-to-ground): En = Un/√3.

Protection Functions: Thermal protection with PT100 thermometric probes. Undercurrent detection with adjustable thresholds. Negative sequence protection for line-transformer, generator, and motor. Phase overcurrent protection with definite and inverse time settings. Locked rotor protection with inverse time settings. Residual overcurrent and overvoltage protection with definite and inverse time settings. Directional earth fault protection with inverse time settings.

Event and Fault Recording: Event recording: 1000 events, circular mode. Fault recording: 20 faults, circular mode.

Circuit Breaker Supervision: Number of CB trips: 0...10000. Cumulative CB tripping currents: 0...5000 In. CB opening time for I²t calculation: 0.05...1.00 s.

Demand Measures: Fixed demand period: 1...60 min. Rolling demand period: 1...60 min.

Metering & Recording: Measures include RMS values, thermal image, sequence currents, and harmonic analysis.

Phase Currents and Harmonics: Details the measurement of phase currents IL1 to IL3, including the 5th harmonic, and specifies demands for fixed, rolling, peak, and minimum phase currents.

Temperature Monitoring: Utilizes PT100 sensors for temperature monitoring, with eight channels labeled Pt1 to Pt8.

Digital Fault Recorder (DFR): Operates in a circular recording mode with a sampling rate of 32 samples per cycle, using COMTRADE file format. Includes pre-trigger and post-trigger times, and can set up to 12 analogue and digital channels.

Auto-Reclose Function (79): Supports rapid and slow modes with configurable dead times and fault discrimination times, allowing up to five delayed reclosures.

Breaker Failure (BF): Includes thresholds for phase and residual currents and a time delay setting.

Pilot Wire Diagnostic: Configurable diagnostic pulses with various periods and control time intervals.

Second Harmonic Restraint: Features a threshold and reset time delay for the second harmonic restraint.

CT Supervision (74CT): Specifies thresholds and operating times for CT supervision.

Input/Output Configuration: Details various input and output configurations, including current and binary inputs, output relays, and Ethernet connections.

Additional Features: Includes ArcFlash, antiferrorisonance, and various protection schemes.

Manufacturer Information: Manufactured by Thytronic S.p.A., with contact details for their headquarters and factory in Italy.

Catalog excerpts

XMR-A OVERCURRENT AND EARTH FAULT PROTECTION RELAYS-1

MORE eXtended MOdular RElays MORE ADVANCED, HIGH-END IEDs FOR PROTECTING, MONITORING AND CONTROLLING ELECTRIC POWER SYSTEMS.

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XMR-A OVERCURRENT AND EARTH FAULT PROTECTION RELAYS-2

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 Enhancements...

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XMR-A OVERCURRENT AND EARTH FAULT PROTECTION RELAYS-3

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 currents...

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XMR-A OVERCURRENT AND EARTH FAULT PROTECTION RELAYS-4

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) Second...

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XMR-A OVERCURRENT AND EARTH FAULT PROTECTION RELAYS-5

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 the...

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XMR-A OVERCURRENT AND EARTH FAULT PROTECTION RELAYS-6

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 (IEn...

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XMR-A OVERCURRENT AND EARTH FAULT PROTECTION RELAYS-7

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 SET...

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XMR-A OVERCURRENT AND EARTH FAULT PROTECTION RELAYS-8

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>>> Element...

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XMR-A OVERCURRENT AND EARTH FAULT PROTECTION RELAYS-9

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 current...

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XMR-A OVERCURRENT AND EARTH FAULT PROTECTION RELAYS-10

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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