What do you mean by auxiliary relay?
[ȯg′zil·yə·rē ′rē‚lā] (electricity) Relay that operates in response to the opening or closing of its operating circuit to assist another relay or device in performing a function.
What is the function of the auxiliary relay?
An auxiliary relay is a relay that assists another relay or device in performing an action. It does this when its operating circuit is opened or closed. These relays are used in nearly all electronic devices to assist them in functioning correctly.
What is transformer auxiliary relay?
Auxiliary current transformers are used in protective relaying circuits for a multitude of applications. The auxiliary CT provides isolation between primary and secondary current circuits. This feature can be used to increase the insulation level between current circuits.
How do you test an auxiliary relay?
Pick Up & Drop Off Timing Test
- For timing test we will use one pole of MCB series with Ammeter to cut dc supply off.
- Use the other pole of MCB for starting sverker timer.
- Use any contact from the aux.
- Inject 125V directly to the relay coil.
- Energize the relay with 125V then switch the supply off.
What is auxiliary contact?
Auxiliary contacts, also known as auxiliary contactors are electromechanical devices used in conjunction with primary switching equipment such as contactors, circuit breakers, switches, and relays. These secondary switching devices are physically connected to the main switching equipment and work at the same time.
Which is called Rated burden of relay?
Burden of a protective relay is the power.
Why the auxiliary relay is required along with the main relay?
Auxiliary relays are used in protection system to provide isolation of primary and back-up relaying. This is to isolate them from unnecessary signals in the form of current especially during tripping.
What auxiliary means?
(Entry 1 of 2) 1a : offering or providing help. b : functioning in a subsidiary capacity an auxiliary branch of the state university. 2 of a verb : accompanying another verb and typically expressing person, number, mood, or tense In “I will go,” the word “will” is an auxiliary verb.
Which relay is used in transformer?
Relays for Transformer Protection
| SL | Voltage Ratio and Capacity of Transformer | Common Relays |
|---|---|---|
| 9 | 400/220KV 315MVA | Differential Relay Overflux Relay Buchholz Relay OLTC Buchholz Relay PRV Relay OT Trip Relay WT Trip Relay Over Load (Alarm) Relay |
Which contact is used in auxiliary switch?
There are two types of contact, contacts that are closed in a non-activated state and those that are open. They will be described as N/C (normally closed) and N/O (normally open). NC contacts are used as interlocks. NO contacts are used for switching on other components such as status indication lamps.
What is the code for an auxiliary relay?
An important type of “accessory” relay, especially for legacy electromechanical protective relays, is the so-called auxiliary or lockout relay, designated by the ANSI/IEEE number code 86.
Which is the correct position for a lockout relay?
This photograph shows a lockout relay actuated by a breaker fault (BF) function, requiring manual intervention before the system may be returned to service: This lockout relay is shown in the “Reset” position, having been placed in that state by someone rotating the handle clockwise until it points vertically.
What is the purpose of an 86 relay?
The purpose of an 86 relay is to serve as an intermediary element between one or more protective relays and one or more control devices, both expanding the number of control elements actuated by any one protective function and also providing a “latching” function which must be intentionally reset in order to resume normal operation of the system.
When does differential lockout ( 86 ) relay pick up?
If any of the differential (87) relays pick up, the lockout (86) relay’s trip coil will become energized through one or more of the 87 contacts.