MMLG01 ALSTOM Standard Test Block For Midos Protection Relay System

Short Description:

ALSTOM MMLG01 multi-circuit secondary test block, dedicated auxiliary component

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Product Detail

ALSTOM MMLG01 multi-circuit secondary test block, dedicated auxiliary component for power system protection relays, supports secondary injection testing and circuit isolation without rewiring.

Product Overview

Part No: MMLG01
Brand: ALSTOM (Grid Solutions)
Category: Protection Relay Test BlockMMLG01 is a standard multi-circuit test block belonging to ALSTOM Midos modular protection series. It serves as an interface terminal unit installed between protection relays and secondary wiring circuits. Equipped with built-in make-before-break contact structure, it can safely isolate current transformer (CT) and voltage transformer (VT) loops. Cooperated with MMLB01 multi-finger test plug, technicians can conduct secondary injection testing, circuit monitoring and fault inspection directly without disconnecting field wiring, effectively avoiding CT open-circuit safety risks during maintenance. It is widely adopted as standard spare component for substation relay protection cabinet renovation and routine overhaul.

Core Features

Make-before-break internal contact design, prevent CT open-circuit hazards during testing operation
14 independent signal circuits integrated, supports multi-channel secondary signal access
Compatible with MMLB01 multi-finger test plug and MMLB02 single-finger test plug
No need to disassemble secondary wiring, greatly simplify protection equipment debugging and maintenance
Robust insulated housing, anti-arc and anti-vibration design adapting substation cabinet environment
Standard mounting dimension, easy installation adjacent to Midos series modular relays
Passed high voltage insulation and long-term mechanical endurance testing, stable continuous operation

Technical Specifications

Rated Insulation Voltage: 300 V AC/DC
Operating Temperature: -20°C ~ +70°C
Storage Temperature: -40°C ~ +85°C
Installation: DIN rail or fixed mounting inside protection cabinet
Protection Class: IP20

Compatibility & Application

Matched with ALSTOM Midos series modular protection relays
Widely applied in high-voltage substations, thermal power and hydropower plant relay protection cabinets
Used for protection function secondary injection test, secondary circuit inspection, equipment commissioning and maintenance