ALSTOM

1. Full Brand Name

GEC‑Alsthom

Full historical corporate name: GEC‑Alsthom, a joint‑venture power‑grid entity formed by UK General Electric Company (GEC) and French Alsthom. Later the brand spelling was updated to GEC‑Alstom.

Business evolution: Its grid‑solutions division was acquired by General Electric, later rebranded GE Grid Solutions, now part of GE Vernova. The MVTT14 series is a classic static time‑delay relay for power‑system secondary circuits and is now end‑of‑life (EOL); available units are spare‑stock components onlyGE Vernova.

Brand background: GEC‑Alsthom specialized in transmission‑and‑substation secondary control components, widely deployed alongside MiCOM protection relays.

Model: MVTT14B1BA0772B, MVTT14B series, time‑delayed pick‑up function, thumbwheel‑switch time setting, with non‑volatile trip‑indication latch featureGE Vernova.

Alsthom MVTT14B1BA0772B

2. Main Functions

1. Digital Time‑delayed Pick‑up Operation When triggered by an external contact input, the internal CMOS oscillator starts timing. Delay value is preset via front‑panel thumbwheel switches. Once the preset time expires, output contacts operate. Instant reset occurs when the external contact opens. Wide timing adjustment ratio up to 1000:1 with high timing accuracy, superior to traditional electromechanical time‑delay relaysGE Vernova.
2. Non‑volatile Trip Indication (MVTT14 exclusive) After relay operation, the trip status is latched. Fault indication is retained even if the triggering input disappears, helping maintenance staff trace event sequence; manual reset is required to clear the flagGE Vernova.
3. Isolated Contact Output Independent passive relay contacts are provided for trip‑circuit drive, alarm‑signal output and interlock logic. Galvanic isolation exists between auxiliary‑supply input and output contacts for high immunity against substation secondary‑circuit interference.
4. Wide‑range Auxiliary‑supply Compatibility Multiple DC auxiliary‑supply ranges are supported, matching common substation control voltages 24 V / 48 V / 110 V / 220 V DC. Solid‑state static circuitry enables long‑term continuous energized operation without mechanical timing‑element wear.
5. Cabinet DIN‑rail mounting Standard‑form‑factor housing for direct DIN‑rail installation inside protection panels, co‑deployable with MiCOM protection relays.

Distinction note: MVTT14 = Time‑delayed pick‑up; MVTT15 = Time‑delayed drop‑off. Identical mechanical housing, different internal logic firmwareGE Vernova.More products: www.plcva.com

3. Applications & Usage

1. Substation protection‑panel auxiliary timing element Provides delayed fault‑signal extension, delayed alarm output and protection‑logic time‑coordination; frequently paired with MiCOM series protection relays.
2. HV circuit‑breaker & disconnector control circuits Implements closing/tripping interlock delay to suppress nuisance mis‑operation caused by contact bounce.
3. Generator & station‑service high‑voltage power systems Realizes time‑sequence logic for bus‑transfer (BZT) schemes, motor‑start delay and delayed fault‑alarm output.
4. Industrial HV distribution & power‑plant auxiliary‑machine control systems Applied for pumps, fans and high‑voltage motor control: start‑up delay, delayed fault‑signal reset, filtering transient interference to prevent false alarms and false tripping.
5. Spare‑part replacement for legacy power‑plants and substations This model is end‑of‑life. It is used as critical replacement spare parts for numerous in‑service aging power‑system installations.

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