Description: The ANSI 295 Supervision Relay is designed to monitor critical circuits, power supplies, and protection elements to ensure reliable system performance. It detects faults such as wiring issues, voltage drops, or device failures and provides early warning to prevent major equipment damage.
Where is the ANSI 295 Relay Used?
The 295 Supervision Relay is commonly used in:
✅ Line Panels → For trip circuit supervision.
✅ Busbar Panels → To monitor DC control supply or critical signals.
✅ Transformer Panels → To supervise key protection devices.
✅ Breaker Panels → For breaker coil supervision and alarm triggering.
Key Functions of the ANSI 295 Relay:
- Trip Circuit Supervision:
- Ensures the trip circuit wiring, coil, and control supply are intact and functioning properly.
- Detects issues such as loose connections, open circuits, or voltage drops.
- DC Power Supply Monitoring:
- Monitors the DC supply voltage to ensure reliable operation of relays, breakers, and alarms.
- Protection Relay Supervision:
- Verifies the availability and healthy status of primary protection relays like 87L, 87B, or 21 Distance Relays.
- Alarm and Indication:
- Provides visual/audible alerts if faults are detected, allowing maintenance teams to respond before a major issue arises.
Example Scenario 1: Trip Circuit Supervision in Line Panel
In a 220kV transmission line panel, the 295 relay supervises the breaker trip circuit.
➡️ If a loose wire disconnects the trip coil, the 295 relay immediately triggers an alarm, ensuring the operator is alerted before the breaker fails to trip during an actual fault.
Example Scenario 2: DC Supply Monitoring in Bus Coupler Panel
In a bus coupler panel, the 295 relay monitors the DC supply for breaker controls.
➡️ If the DC voltage drops due to a battery failure or wiring fault, the 295 relay will indicate the issue, allowing operators to restore power before system protection is compromised.
Key Benefits:
- Ensures continuous monitoring of critical circuits.
- Provides early warning to prevent breaker or relay failures.
- Improves system reliability by detecting faults before they affect protection performance.
Want to explore more exciting content? Click here to dive in!