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Description
Product Overview: ALSTOM MVAJM25LA1010A Motor Protection Relay
1. General Description
The MVAJM25LA1010A is a member of the Micom P14x family of advanced, numeric protection relays manufactured by ALSTOM (now part of GE Grid Solutions). This specific model is engineered primarily for the comprehensive protection, control, and monitoring of medium-voltage asynchronous motors.
It is a versatile and robust device designed to maximize motor availability, prevent damage from electrical faults, and reduce downtime through advanced monitoring features. The relay integrates multiple protection functions, metering, and control logic into a single, compact unit, making it a cornerstone for industrial motor protection schemes.
2. Key Features and Functions
- Advanced Motor Protection: Includes a full suite of protection functions tailored for motors, such as:
- Thermal Overload Protection (49RMS): Models the motor’s thermal capacity based on measured current, accounting for heating and cooling times.
- Stall Protection (14): Detects and trips for locked rotor conditions during start-up or running.
- Short Circuit Protection (50/51): Phase and neutral timed and instantaneous overcurrent.
- Earth Fault Protection (50N/51N, 50G/51G): Sensitive protection for ground faults.
- Start-up Supervision / Excessive Start Time: Monitors the duration of the motor start.
- Undercurrent (37) & Underpower (37P): For pump clogging or load loss detection.
- Negative Sequence / Unbalance (46): Protects against motor heating due to phase unbalance.
- Number of Starts Inhibition: Prevents excessive consecutive starts or restarts.
- Under-voltage (27) & Over-voltage (59): Protects the motor from abnormal supply conditions.
- Control and Automation:
- Programmable Logic Controller (PLC) functionality for customizing control sequences.
- Multiple configurable inputs (digital) and outputs (relay contacts).
- Direct control of the motor breaker or contactor.
- Monitoring and Metering:
- Real-time measurement of Ia, Ib, Ic, In, Vab, Vbc, Vca, frequency, power (kW, kVAR), power factor, and energy.
- Records motor thermal capacity used.
- Monitoring of motor starts and run hours.
MVAJ205
- Communication and Integration:
- Equipped with multiple communication ports.
- Supports standard industrial protocols like IEC 60870-5-103, Modbus® RTU (serial), and often Profibus-DP or Modbus TCP/IP (depending on the specific hardware configuration).
- Facilitates integration into SCADA, DCS, and Plant Management Systems.
- Human-Machine Interface (HMI):
- A backlit graphical LCD display for clear data visualization.
- Intuitive keypad and navigation menu for local configuration and access to measured values, fault records, and event logs.
- Event Recording and Oscillography:
- Detailed sequence of events (SOE) recorder with time-tagging.
- Fault record (oscillography) capture for post-fault analysis.
3. Technical Specifications
| Parameter | Specification |
|---|---|
| Standard | IEC 60255, IEC 60947, IEEE C37.90 |
| Auxiliary Supply (Vs) | A common range is 48 – 250 V DC or 48 – 265 V AC, 50/60 Hz. (Note: The “LA” in the code may specify a low-power AC/DC supply variant. Exact value must be confirmed from the nameplate.) |
| Rated Input Current (In) | Typically 1 A or 5 A (configurable via CT settings). |
| Current Inputs | 4 analog inputs (3 phase + 1 neutral). |
| Voltage Inputs | Up to 3 phase-to-phase voltages (optional). |
| Binary Inputs | Typically 5 to 7 programmable digital inputs. |
| Output Relays | Typically 5 to 7 programmable changeover (CO) relay contacts. |
| Communication Ports | • 1x Front port (RS485 for PC connection) • 1x Rear port (RS485 for SCADA, e.g., Modbus RTU) • Optional rear communication modules (e.g., Profibus, Ethernet). |
| Protective Functions | As listed in Key Features (Thermal, Stall, Overcurrent, Earth Fault, etc.). |
| Ambient Temperature | Operation: -25°C to +70°C (-13°F to +158°F). Storage: -40°C to +85°C. |
| Mounting | Panel-mounted, designed for standard 19″ rack or flush mounting. |
4. Ordering Code Breakdown: MVAJM25LA1010A
- M: Micom family
- VAJ: Specific series/model (P14x platform for motor protection)
- M: Hardware variant/package style
- 25: Software option (specific firmware version & function set)
- L: Power supply code (likely Low-power AC/DC)
- A: Communication option (e.g., Base model with RS485 ports)
- 1010: Case style and CT rating (e.g., 1A or 5A)
- A: Version or revision
5. Typical Applications
The MVAJM25LA1010A is ideally suited for protecting critical motors in various industrial sectors, including:
- Oil & Gas (pumps, compressors)
- Mining (conveyors, crushers)
- Water and Wastewater Treatment (pumps)
- Power Generation (auxiliary motors, boiler feed pumps)
- Chemical and Petrochemical plants
- Manufacturing and Heavy Industry
6. Important Note
- ALSTOM’s grid business was acquired by General Electric and is now known as GE Grid Solutions. This product is part of the legacy ALSTOM portfolio now supported by GE.
- For absolute precision regarding configuration, firmware, and specifications for a specific unit, it is essential to refer to the official product manual, nameplate, or data sheet from GE Grid Solutions. The information provided here is a general overview based on the standard features of the Micom P14x series.
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