The Alstom MCVG61H1ADC1001D (part number 1K016061/001) is a high-precision static voltage protection relay from the renowned Midos range. This relay is specifically designed for overvoltage and undervoltage monitoring in electrical power systems. It provides essential protection for generators, motors, and transformers by ensuring that system voltage remains within safe operating limits, preventing damage caused by voltage surges or brownout conditions.

 

Product Technical Description

The MCVG61 is a single-phase voltage relay that utilizes high-reliability solid-state technology. It can be configured for either overvoltage or undervoltage operation through internal settings. The “H1ADC” designation refers to its specific hardware build, which includes high-accuracy measurement circuits and stabilized auxiliary power supplies. The relay is housed in a standard Midos size 2 draw-out case, allowing for easy maintenance and testing without disconnecting the terminal wiring. It features adjustable time delays and pick-up levels to ensure coordination with other protection devices in the network.

Product Datasheet & Parameters

• Model Number: MCVG61H1ADC1001D
• Legacy Part Number: 1K016061/001
• Series: MCVG (Midos Protection)
• Relay Type: Single-Phase Voltage Protection (Over/Under)
• Rated Voltage (Un): 110V AC or 240V AC (Nominal input)
• Auxiliary Supply: 24V – 125V DC or 110V – 250V AC/DC (Wide-range)
• Frequency: 50Hz / 60Hz (Universal)
• Setting Range: 0.1 to 1.5 x Un (depending on specific configuration)
• Time Delay: Adjustable Definite Time (DT) or Instantaneous
• Case Size: Midos Size 2 Draw-out
• Output Contacts: 2 Normally Open (NO) and 2 Normally Closed (NC) contacts

 

Country of Origin

This protection relay was manufactured by Alstom (formerly GEC Alsthom) in the United Kingdom (UK) or France.

 

Application Fields

• Generator Protection: Monitoring for overvoltage conditions during load shedding.
• Motor Control: Protecting industrial motors from undervoltage-induced overheating.
• Substation Automation: Busbar voltage monitoring and interlocking logic.
• Transformer Protection: Ensuring tap-changer operations remain within safe voltage windows.
• Renewable Energy: Voltage synchronization and protection for wind and solar grid tie-ins.

 

Product Usage Instructions

When installing the MCVG61, ensure the auxiliary supply voltage matches the rating on the relay serial plate. The relay should be mounted in a clean, vibration-free environment, typically within a protection cubicle. Use the front-panel potentiometers to set the “V>” (Overvoltage) or “V<” (Undervoltage) threshold and the desired time delay. Before commissioning, a secondary injection test should be performed using a calibrated voltage source to verify the trip points. The draw-out feature allows the module to be removed; ensure the “shorting links” are in place if CT circuits are integrated into the same panel.

 

Common Questions & Answers (Q&A)

Q: Can this relay be used for both overvoltage and undervoltage simultaneously? A: The MCVG61 is typically configured for one primary function (either Over or Under). For dual protection on a single phase, two units are often used, or a multi-function relay like the MCVG62/63 series is selected.

Q: Does this relay require a neutral connection? A: It monitors the voltage applied to its input terminals. In a three-phase system, it is usually connected phase-to-neutral or phase-to-phase via a Voltage Transformer (VT).

Q: How do I identify a “Trip” condition? A: A mechanical flag indicator (usually red) will drop on the front panel when a trip occurs. This flag must be manually reset using the button on the front cover once the fault is cleared.

Q: Is it compatible with older GEC Midos cases? A: Yes, the MCVG series is fully compatible with standard Midos type cases, making it an ideal drop-in replacement for older static relays of the same size.

 

Similar Model Recommendations

1. Alstom MCVG61H1BA0002D
2. Alstom MCVG62H1ADC1001D (Three-phase version)
3. GEC Alsthom MCVG63 series
4. Alstom MiCOM P120 (Modern digital equivalent)
5. Alstom METI series (Time-delay relays)