86 Relay Wiring Diagram

The 86 relay, or lockout relay, plays a critical role in electrical protection systems. Understanding the 86 relay wiring diagram is essential for ensuring proper operation of equipment and preventing extensive damage during fault conditions. This guide provides a detailed overview of the 86 relay, its function, wiring, applications, and troubleshooting.

Benefits and Purpose of an 86 Relay

The primary function of the 86 relay is to provide a maintained trip signal to isolate faulty equipment or circuits from the power system. Key benefits and purposes include:. For more related activities, check out our 2 Prong Switch Wiring Diagram.

• Equipment Protection: Prevents further damage to expensive electrical equipment by isolating it during fault conditions.
• Personnel Safety: Enhances safety by removing dangerous voltages and currents from the system.
• System Stability: Helps maintain system stability by preventing cascading failures.
• Remote Indication: Provides remote indication of a fault condition, allowing for quick assessment and response.
• Maintained Trip Signal: Once tripped, the 86 relay remains tripped until manually reset, ensuring the issue is addressed.

Understanding the Key Components in an 86 Relay Wiring Diagram

An 86 relay wiring diagram will typically include the following components:

• 86 Relay Device: The electromechanical or solid-state relay itself, which contains the trip coil and contacts.
• Trip Coil: The coil that, when energized, causes the relay to trip.
• Seal-in Contacts: Contacts that latch the relay in the tripped position.
• Auxiliary Contacts: Contacts used for remote indication, alarms, or other control functions.
• Reset Mechanism: A manual or electrical reset button to return the relay to its normal state.
• Power Supply: Source of power for the relay’s operation.
• Input Signals: Signals from protective relays (e.g., overcurrent, differential, voltage) that trigger the 86 relay.

Practical Applications and How the 86 Relay Works

The 86 relay finds application in various electrical systems:

• Transformer Protection: Tripping the transformer circuit breaker upon detection of internal faults.
• Generator Protection: Isolating the generator from the grid during faults or abnormal conditions.
• Busbar Protection: Clearing faults on busbars to prevent extensive damage.
• Motor Protection: Protecting large motors from overload, short circuits, or other faults.
• Feeder Protection: Quickly isolating a feeder to prevent further system disturbances.

When a protective relay detects a fault, it sends a signal to the 86 relay’s trip coil. The trip coil energizes, causing the relay contacts to change state. The seal-in contacts latch the relay in the tripped position, maintaining the trip signal. Auxiliary contacts provide remote indication of the fault. The relay remains tripped until manually reset, prompting investigation and correction of the underlying issue.

1. Troubleshooting Common Issues with 86 Relays

Common problems encountered with 86 relays include:

• Failure to Trip: Possible causes include a faulty trip coil, open circuit in the wiring, or insufficient voltage to the trip coil.
• Failure to Reset: May be due to a stuck reset mechanism, faulty seal-in contacts, or continued presence of the fault signal.
• Spurious Tripping: Can be caused by electrical noise, vibration, or a faulty relay.
• Incorrect Wiring: Incorrect connections in the 86 relay wiring diagram leading to maloperation.

2. Tips for Working with 86 Relays

• Refer to the Manufacturer’s Manual: Always consult the manufacturer’s manual for specific wiring diagrams and operating instructions.
• Verify Wiring: Double-check all wiring connections to ensure they match the 86 relay wiring diagram.
• Test Regularly: Perform routine testing to verify the relay’s operation.
• Use Proper Tools: Use insulated tools and wear appropriate personal protective equipment (PPE) when working with electrical equipment.
• Implement Redundancy: In critical applications, consider using redundant relays for increased reliability.

Frequently Asked Questions (FAQs)

Here are some common questions about 86 relays:

• Q: What is the difference between an 86 relay and a standard protective relay?
  A: The 86 relay is a lockout relay that provides a maintained trip signal, while a standard protective relay detects a fault and initiates the trip signal to the 86 relay.
• Q: Can an 86 relay be reset remotely?
  A: Yes, some 86 relays have provisions for remote reset.
• Q: What type of power supply is required for an 86 relay?
  A: The power supply voltage depends on the specific relay model, but commonly used voltages are 125 VDC, 250 VDC, and 120 VAC.
• Q: What are the different types of 86 relays?
  A: Electromechanical and solid-state versions are available. Solid-state relays offer faster response times and greater reliability.

Conclusion

Understanding and correctly implementing an 86 relay wiring diagram is crucial for the reliable protection of electrical equipment and systems. By adhering to best practices, performing regular testing, and promptly addressing any issues, engineers and technicians can ensure the 86 relay effectively protects the electrical infrastructure.