What is a 25 relay?
This relay monitors the voltages on both sides of a circuit breaker and determines the existence of proper phase angle and voltage before allowing the breaker to close.
What is a 49 relay?
49 Machine or transformer thermal relay A relay that functions when the temperature of a machine armature winding or other load-carrying winding or element of a machine or power transformer exceeds a predetermined value.
What is a 69 relay?
66 – Notching or jogging device. 67 – AC Directional Overcurrent Relay. 68 – Blocking or “out of step” Relay. 69 – Permissive Control Device. 74 – Alarm Relay.
What is 86 lockout relay?
Introduction. Many utilities employ lockout relays (ANSI device number 86, electrically operated, hand or electrically reset) that function to shut down and hold equipment out of service on the occurrence of abnormal conditions.
What is a 74 relay?
Intro to Relays #2 – ANSI/IEEE Relay Numbers
| # | Name |
|---|---|
| 52 | Circuit Breaker |
| 59 | Overvoltage |
| 74 | Alarm |
| 79 | AC Reclosing |
What is a 50 relay?
On electromechanical relays, the 50 function can be added as an instantaneous attachment to a 51 time-overcurrent relay. If a relay has both 50 and 51 functions present and enabled is referred to as a 50/51 relay. This relay is referred to as a residual ground overcurrent or 51N (or 50/51N) relay.
What is a 21 relay?
The goal of a distance relay (ANSI/IEEE code 21) is to trip its circuit breaker(s) if a fault occurs within its programmed “reach” and to ignore both normal operating loads and faults lying outside its reach.
What is a 59 relay?
Intro to Relays #2 – ANSI/IEEE Relay Numbers
| # | Name |
|---|---|
| 50 | Instantaneous Overcurrent |
| 51 | Inverse-Time Overcurrent |
| 52 | Circuit Breaker |
| 59 | Overvoltage |
What does an 86 relay do?
Defination: Master trip relay is a contact multiplication or an Auxillary relay, which operates on the command from Multiple protection relays and gives a Single Commmand to the Breaker Trip Coil. ANSI Code: Its ANSI Code is 86. Remarks: Master Trip Relay (86) cannot Sense Faults.