The numerical relay provides that provide overcurrent and earth fault protection functionality for medium voltage substations and backup protection for feeders, transformers, generators, motors, and busbars.

The devices include a comprehensive functional software package which provides a range of protection, control and supervision functions aimed at reducing installation, wiring, and engineering time.

Features

• User Programmable Logic.
• Two programmable fascia function keys.
• Four function setting groups.
• Password protection – Maintenance/Connection.
• Confirmation ID protection – Setting/Control/Security Log
• Self-monitoring.
• Circuit Breaker Trip and Maintenance Counters
• Trip Timer
• Up to 100 Fault Records
• Up to 5,000 Event Records with 1ms resolution
• Up to 200 seconds of Waveform Records.
• Demand/data logs.

Device design

• Size 6, 8 or 12, 4U high housing, withdrawable devices.
• Large backlit display, 128 x 128 pixels. Text and graphical display.
• Operation keypad with 7 keys - 5x navigation and 2x function keys.
• 28 user programmable LEDs with three selectable colours.

Languages

User selectable English, French, German, Portuguese, Spanish, Turkish.

Binary inputs and outputs

X 8 binary inputs, 6 binary outputs

O Up to 39 binary inputs, 20 binary outputs, 3 high speed binary outputs.

Measuring inputs

X 4 x CT inputs 1A & 5A, 50/60 Hz.

O Up to 5 x CT inputs, 4 x VT inputs (40 to 160V).

Auxiliary voltages

X Auxiliary supply 24 to 250V DC, 100 to 230V AC.

X Binary input user selectable thresholds 24 or 110 or 220V DC.

Communication interfaces

X Front interface: USB

X Rear RS485 serial comms port: IEC 60870-5-103, Modbus RTU, DNP 3.0.

O Rear 2 x RJ45 or 2 x Optical LC ethernet ports.

X Ethernet protocols: IEC 61850 (HSR, PRP, RSTP), Modbus TCP, DNP3 TCP.

X SNTP, IEEE 1588 PTP.

Arc Flash Detector Inputs

X Without

O 3 x AFD inputs (includes 3 high speed binary outputs)

Temperature Sensor Inputs

X Without

O 8x Temperature Sensor inputs

Functionality

X Basic functions

• Undercurrent (37)
• Negative Sequence Overcurrent protection (46)
• Broken Conductor detection (46BC)
• Thermal Overload (49)
• Instantaneous Overcurrent protection (50)
• Instantaneous Calculated/Measured Earth Fault protection (50N/G)
• High Speed Earth Fault protection (50GHS)
• Time Delayed Overcurrent protection (51)
• Intermittent Earth Fault protection (50GI)
• Sensitive Earth Fault instantaneous/time delayed protection (50/51GS)
• High Speed Overcurrent protection (50HS)
• Time Delayed Calculated/Measured Earth Fault protection (51N/G)
• Cold Load Overcurrent (51CL)
• Switch onto Fault (50SOTF)
• Circuit Breaker Failure (50BF)
• CT Supervision (60CTS)
• Trip and Close Circuit Supervision (74TC/CC)
• Automatic Reclosing (79)
• Backspin monitor (81B)
• Inrush Current detection (81HB2)
• Lockout (86)
• Restricted Earth Fault protection – high impedance (87GH)
• Restricted Earth Fault protection – low impedance (87NL)
• CB Control

O Optional functions

• Fault Locator (21FL)
• Load Blinder (21LB)
• Synchro-check function (25)
• Undervoltage protection (27)
• Power protection (32)
• Sequence Overvoltage protection (47)
• Temperature Sensor supervision (49TS)
• Arc Flash detection (50AFD)
• Voltage Dependent Overcurrent (51V)
• Power Factor (55)
• Overvoltage protection (59)
• Neutral Voltage Displacement (59N)
• VT Supervision (60VTS)
• Directional overcurrent (67)
• Directional Calculated/Measured Earth Fault protection (67N/G)
• Voltage Vector Shift (78VS)
• Frequency protection (81)

Conformal coating

X No conformal coating

O Conformally coated PCBAs