ALSTOM

1. Full Brand Name

ALSTOM: Alstom Grid. The grid business division of Alstom (France). This division was acquired by General Electric in 2015 and renamed GE Grid Solutions, currently under GE Vernova. Early‑generation units are marked ALSTOM, later‑generation units carry GE branding, hence the market name ALSTOM‑GE.

Full Manufacturer Name: Alstom Grid / General Electric Grid Solutions (GE Vernova)

Product Family: Midos accessory series, compatible with MiCOM protection relays.

ALSTOM‑GE MMLG02 MMLG02R1AA0001E Protection Relay Test Block Module

2. Main Functions

Model: MMLG02R1AA0001E, MMLG‑series test block with 14 independent test circuits.

1. Safe Circuit Isolation: Internal spring‑loaded contacts stay closed during normal operation, passing CT current, PT voltage and DC control signals to protection relays. When mating MMLB01 multi‑finger test plug is inserted, internal contacts open automatically. It safely isolates protection relays from primary‑side CT / PT secondary circuits without removing any back‑panel wiring, eliminating severe safety hazards caused by CT open‑circuit high‑voltage.
2. Secondary‑Injection Test Interface: After isolation, connect protective‑relay test sets via MMLB01 test plug. Inject simulated fault current & voltage to verify relay setting values and protection logic.
3. On‑line Signal Monitoring: Measure and monitor secondary current, voltage and trip‑control circuits without wire disconnection.
4. Safety Protection: Housing cover provides electric‑shock prevention; partial terminals will be auto‑disconnected when cover is removed for extra maintenance safety. Standard 4U vertical rack mounting fits standard substation protection cabinets perfectly.More products: www.plcva.com

⚠️This module does NOT execute protection logic. Protection logic is implemented by MiCOM series protection relays.

ALSTOM‑GE MMLG02 MMLG02R1AA0001E Protection Relay Test Block Module

3. Applications & Usage

1. Substation Busbar‑Protection Panels: Standard test interface for busbar differential‑protection schemes, its primary application.
2. Periodic Maintenance & Calibration of Protection Relays: Perform secondary‑injection tests without wire removal, greatly shortening maintenance downtime.
3. Line Protection & Generator‑Protection Panels: Works with MiCOM P‑series relays (P14x / P44x / P74x etc.) for current‑voltage loop isolation & commissioning.
4. Industrial High‑Voltage Power Distribution Systems: Used in factory & mine high‑voltage switchgear panels for relay commissioning, fault reproduction and circuit troubleshooting.
5. Retrofit Projects: Serves as standardized test interface for legacy‑panel renovation, minimizing secondary‑circuit modification and human‑wiring errors.

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