Application Scenarios
In a recent upgrade at a combined heat and power (CHP) plant in Northern Europe, engineers needed to enhance the protection of their generator sets against voltage fluctuations caused by grid disturbances. The WOODWARD MRU3-11D was integrated into the protection scheme to monitor terminal voltage and trip the generator breaker in case of abnormal conditions. The relay’s fast response time and adjustable settings allowed for tailored protection, preventing potential damage to the generator and connected equipment.
Another typical application involves a water treatment facility in the Middle East, where reliable power is crucial for continuous operation. The site uses multiple generators in parallel, and the WOODWARD MRU3-11D plays a key role in monitoring voltage levels to ensure stable power distribution. By detecting and responding to voltage anomalies, the relay helps maintain consistent power quality, protecting sensitive equipment and preventing costly downtime.
Parameter
| Main Parameters | Value/Description |
|---|---|
| Product Model | MRU3-11D |
| Manufacturer | WOODWARD |
| Product Category | Voltage Relay |
| Function | Under-voltage and over-voltage protection |
| Voltage Setting Range | Adjustable via front-panel potentiometer |
| Accuracy | ±1% of setpoint |
| Pickup Time | Adjustable, typically 0.1 to 10 seconds |
| Dropout Time | Adjustable, typically 0.1 to 10 seconds |
| Input Voltage | 100-240 V AC/DC |
| Output Contacts | SPDT (Single Pole Double Throw) |
| Contact Rating | 5 A at 250 V AC resistive |
| Operating Temperature | -40°C to +70°C (industrial grade) |
| Storage Temperature | -55°C to +85°C |
| Humidity Range | 5% to 95% non-condensing |
| Dimensions (WxHxD) | 90 mm x 70 mm x 50 mm (approx.) |
| Mounting | Panel mount |
| Certifications | CE, UL, IEC 60255 compliant |
Technical Principles and Innovative Values
- Innovation Point 1: Precision Voltage Monitoring
The WOODWARD MRU3-11D utilizes high-accuracy voltage sensing technology to monitor electrical systems in real time. Its ±1% accuracy ensures reliable detection of voltage anomalies, protecting equipment from potential damage. - Innovation Point 2: Adjustable Pickup and Dropout Times
The relay features adjustable pickup and dropout times, allowing for customization to specific application requirements. This flexibility ensures optimal protection without nuisance tripping, enhancing overall system reliability. - Innovation Point 3: Robust Electromagnetic Design
Engineered with a rugged electromagnetic design, the WOODWARD MRU3-11D provides reliable operation even in electrically noisy environments. Its shielded construction minimizes interference from adjacent equipment, ensuring accurate voltage monitoring. - Innovation Point 4: Versatile Output Contacts
The relay’s SPDT output contacts offer flexibility in control schemes, allowing for direct interfacing with alarm systems, circuit breakers, or other protective devices. This versatility simplifies integration into existing protection systems. - Innovation Point 5: Wide Operating Temperature Range
Designed for extreme environments, the WOODWARD MRU3-11D operates reliably across a wide temperature range (-40°C to +70°C). Its robust construction ensures consistent performance in harsh industrial conditions, from freezing cold to scorching heat.
