Installation Manual for DEIF MVR-200 Series Medium Voltage Protection Device

Installation Manual for DEIF MVR-200 Series Medium Voltage Protection Device

Basic Information

Name: MVR-200 Series Medium Voltage Relay Installation Manual for Medium Voltage Relay Protection Device

Applicable products: MVR-21x (compact) and MVR-25x (wide body) hardware platforms, with multiple protection models for feeder lines, motors, generators, transformers, and bus voltages

Applicable industries: Land substations, ship power systems, meeting classification society and industrial EMC, safety regulations

Installation Specification for the Whole Machine (Hole Opening, Installation Dimensions, Wiring Requirements)

2.1 Installation specifications for two models

MVR-21x (Narrow 1/4 19 inch Rack)

Panel opening: 106 ± 3mm wide; Depth dimension of the whole machine; Support cabinet embedded openings/standard 19 inch rack side by side installation, up to 4 units in the same cabinet.

MVR-25x (Wide 1/2 19 inch rack)

Panel opening width of 220mm, with a maximum of 2 units arranged side by side on the same rack; Both models are equipped with sealing gaskets, and the panel protection can reach IP66.

Install fasteners: M5 locking nut, sealing washer, tightening torque specification.

2.2 Wiring Hard Standards

The terminal tightening torque should be uniformly 0.5~0.6 N · m, and only the original matching terminal block should be used;

Protective grounding: The minimum grounding wire is 2.5mm ², with a dedicated grounding terminal for the grounding device. The grounding wire cannot be removed when the power is cut off;

Power circuit: L-type (24/48VDC), H-type (100~125VDC) dual specifications, two redundant power supplies with 4A slow melting fuse, connected in series with anti reverse diodes above 100V;

Voltage transformer circuit: 2A series near VT slow melting fuse for each phase;

The output relay load shall not exceed the rated capacity of the module (220VAC maximum 3A, 220DC only 0.2A).

Modular System of Whole Machine Hardware (Detailed Explanation of Core Hardware Terminals)

The MVR-200 adopts a CPU main module+pluggable expansion option architecture. All models come standard with a CPU/IO/power motherboard, while others are used for measurement, communication, and other functions DI/DO、 Arc protection and analog signals are both optional plug-in cards.

3.1 CPU/IO/Power Basic Motherboard (MVR-21x, 25x Universal Architecture)

communication interface

COM A (RJ45 Ethernet): IEC61850, Modbus TCP, IEC104, DNP, upper software debugging;

COM B（RS485）：Modbus RTU、SPA、IEC101/103， Onboard terminal resistor jumper;

Digital input DI: standard 2/3 channels, software can set normally open/normally closed, action/return delay, AC filtering 30ms, scanning cycle 5ms, voltage specifications 24/110/220V optional;

Output relay DO: 5-way normally open+1-way fault conversion contact (SF, contact switching in case of power loss/fault), contact 250VAC/DC universal;

Power supply terminals X19/X20: distinguish between high and low voltage DC power supply; The overall power consumption is ≤ 15W, the power supply can withstand 15% ripple, and the startup time is ＜ 5ms.

3.2 Standard Measurement Card (Universal for All Models)

CT current measurement module

3-phase current+coarse/fine residual zero sequence current input; Secondary 1A/5A CT compatibility; Measurement range: 0~250A phase current, 0~150A coarse zero sequence, 0~75A fine zero sequence; 18 bit AD sampling, 64 points per cycle, wide frequency range of 6-1800Hz, phase error<± 0.5 °.

VT voltage measurement module

4 independent voltage channels, supporting 3-phase four wire, two-phase Aron connection, and synchronous voltage acquisition; Input 0~480V, compatible with 100/400V VT secondary, accuracy ± 0.2%. Provide troubleshooting methods for wiring faults (amplitude, phase, and zero sequence abnormality troubleshooting).

3.3 Optional Expansion Function Modules

Option D Arc Flash Protection Card

4 optical sensing channels, with a maximum of 3 arc sensors per channel; Equipped with two<1ms high-speed DC trip outputs and one DI, with dual criteria of light and overcurrent to prevent misoperation, suitable for rapid removal of arc faults in switchgear.

Option B DI8 Digital Input Expansion Card

Add 8 isolated DI channels, with a voltage threshold of 16~200V that can be adjusted by software, and an independent common ground for circuit breaker auxiliary and fault external signal acquisition.

Option C DO5 Relay Output Card

Add 5 independent normally open relays for multi group tripping, sound and light alarm, and remote signal output.

Option L/M/N/O RS232/Fiber Optic Serial Port Card

ST fiber optic serial communication+RS232, supports IRIG-B clock synchronization input, 3.3V auxiliary power output.

Option J LC100 Fiber Ethernet Card

Dual LC 100Mbps fiber optic ports, supporting HSR/PRP redundant networking and IEEE1588 timing, fully compliant with IEC61850 substation redundant bus.

Option I 4~20mA Analog Input/Output Card

4-channel isolated mA output and 1-channel isolated mA input, used for external instruments, speed regulation and voltage setting acquisition.

Wiring and Application Solutions for All Series Models (the largest chapter in the book)

According to the protected objects, it is divided into five series: feeder F, motor M, generator G, transformer T, and bus voltage V. Each model provides a terminal diagram, functional block diagram, typical primary and secondary wiring examples, and also explains the 2CT two-phase Aron simplified wiring scheme.

4.1 Feedline Protection Series (F201/F205/F210/F215/F255)

Suitable for factory power supply and busbar outgoing line protection, with standard overcurrent, zero sequence, direction, circuit breaker failure, and arc protection; Support 2CT Alon three-phase three wire simplified connection method (defect: unable to detect L2 grounding).

4.2 Motor Protection Series (M210/M215/M255/M257)

Specially designed for high-power high and low voltage motors, it integrates locked rotor, overheating RTD, negative sequence, differential (M257), start monitoring, grounding protection, and supports CT differential wiring diagrams on both sides of the motor.

4.3 Generator Protection Series (G215/G257)

Complete protection for ship/industrial generators, including stator differential, demagnetization, reverse power, overvoltage/low frequency, rotor temperature measurement, and synchronous voltage detection logic, providing differential wiring for generator+step-up transformer combination.

4.4 Transformer Protection Series (T215/T216/T256/T257)

Dual winding transformer differential, high and low voltage side zero sequence, overheating, and voltage regulation tap control, T257 supports bilateral CT differential protection scheme.

4.5 Bus Voltage Protection V211

Monitoring of bus overvoltage, undervoltage, zero sequence overvoltage, frequency abnormality, PT disconnection alarm.

4.6 General matching: Trip circuit monitoring TCS

An independent section will explain the wiring of trip circuit monitoring: there are two types of circuits: non self-locking and self-locking trip relays. DI is equipped with a 1-second anti shake delay to distinguish the auxiliary contact wiring logic for circuit breaker opening and closing, in order to prevent disconnection and coil burnout that prevent tripping.