1
1.
summary
Main Application
Gas relay is a kind of protective devices used for oil-immersed transformers and oil-immersed on
Load tap changers.Gas relay(hereinafter referred to as the relay) is installed in the pipe connector
Between a transformer cover and a conservator and may be fitted with an air duct box to real-ize ground
exhaustion and sampling. The relay is contacts act to make connect with control loop
designated and signal in time or automatically cut off the transformer in the case of oil decomposed and gasified
or oil flow implusion caused by internal failure of the transformer.
2.
Model
3.Service Conditions
3.1.Permissible operating temperatures:-30~+95
3.2Assembling method: the relayis pipe axis should be parallel to the transformer case cover,
And it is allowed for the end leading to the conservator id higher, however the inclination between
The axis and level surface may not exceed 4%.
4.Structure & Operating Principle
Structure of the Gas Relay
QJ series of relays are basically in similar structure.the relay’ s core structure is shown in
Fig.1
, and the relay’
supper core consists of gas lock 1,gas lock nut 2,probe 3, blocking 4, snap ring(float)5, weights drop 6, guard
board7, magnet 8, connecting terminal9, spring 10, regulating rod11, and dry reed contact12, forming a flow
device that acts on tripping. Gas lock 1 in the cover is used for exhaustion in the case of assembly and extracting
gas out of order. Probe 3 is used to check flexibility and reliability of the tripping mechanism.
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2
3
4
5
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7
8
12
11
10
9
Fig.1
5.Operating Principle of Gas Relay
In the case of normal operation it is full of transformer oil inside the relay
．
The snap ring(float) is in inclined
QJ
Serial number designed
Gas relay
Pipe diameter
(nominal valve) mm
A-with waterproof covers
and gas-collecting box
