QJ20-80A Transformer Gas Relay Transformer Buchholz Relay
QJ Series Gas Relay
Gas relay is a main protection device for internal failures of oil-immersed transformers and oil-immersed on-load tap-changers. The gas relay (gas relay) is installed on the connecting pipeline between the transformer and the oil conservator. When the internal fault of the transformer causes the oil to decompose to produce gas or cause the oil flow impulse, the contact of the gas relay is activated to connect the designated control circuit. And send a signal in time or automatically cut off the transformer.
Note: Code of special use environment
TH-Humid tropical zone TA-Dry tropical zone General type without indication
Supply Model List：
| Model | Pipe Diamete（mm） | Gas Volume（ml） | Flow Rate Setting（m/s） | Reed Contact Characteristics | Wiring diagram No. |
| QJ4-25 | 25 | 200~250 | 1.0 | Single signal,Single trip | 4 |
| QJ4G-25 | ∕ | Single trip | 5 | ||
| QJ6-25 | Double trip | 6 | |||
| QJ1-50 | 50 |
250~300 |
0.6～1.2 | Single signal
Double trip with common point |
7 |
| QJ1-80 | 80 | 0.7～1.5 | |||
| QJ2-50 | 50 | 0.6～1.2 | |||
| QJ2-80 | 80 | 0.7～1.5 | |||
| QJ3-50 | 50 | 0.6～1.2 | Single signal, double independent tripping | 8 | |
| QJ3-80 | 80 | 0.7～1.5 | |||
| QJ4-50 | 50 | 0.6～1.2 | Single signal
Double trip with common point |
7 |
|
| QJ4-80 | 80 | 0.7～1.5 | |||
| QJ5-50 | 50 | 0.6～1.2 | Single signal, double independent tripping |
8 |
|
| QJ5-80 | 80 | 0.7～1.5 | |||
| QJ6-50 | 50 | 0.6～1.2 | |||
| QJ6-80 | 80 | 0.7～1.5 | |||
| QJ7-50 | 50 | 0.6～1.2 | Single signal
Double trip with common point |
7 |
|
| QJ7-80 | 80 | 0.7～1.5 | |||
| QJ8-50 | 50 | 0.6～1.2 | Dual signal with common points,
Double trip with common point |
9 |
|
| QJ8-80 | 80 | 0.7～1.5 | |||
| QJ9-50 | 50 | 0.6～1.2 | |||
| QJ9-80 | 80 | 0.7～1.5 | |||
| QJ10-50 | 50 | 0.6～1.2 | Single signal
Double trip with common point |
7 |
|
| QJ10-80 | 80 | 0.7～1.5 | |||
| QJ11-50 | 50 | 0.6～1.2 |
Single signal, double independent tripping |
8 |
|
| QJ11-80 | 80 | 0.7～1.5 | |||
| QJ12-50 | 50 | 0.6～1.2 | |||
| QJ12-80 | 80 | 0.7～1.5 | |||
| QJ13-50 | 50 | 0.6～1.2 | |||
| QJ13-80 | 80 | 0.7～1.5 | |||
| QJ14-50 | 50 | 0.6～1.2 | Dual signal with common point
Double trip with common point |
9 | |
| QJ14-80 | 80 | 0.7～1.5 | |||
| QJ15-50 | 50 | 0.6～1.2 | Single signal, double independent tripping | 8 | |
| QJ15-80 | 80 | 0.7～1.5 | |||
| QJ16-50 | 50 | 0.6～1.2 | Dual signal with common point
Double trip with common point |
9 | |
| QJ16-80 | 80 | 0.7～1.5 | |||
| QJ17-50 | 50 | 0.6～1.2 | Double independent signal single trip | 10 | |
| QJ17-80 | 80 | 0.7～1.5 | |||
| QJ18-50 | 50 | 0.6～1.2 | |||
| QJ18-80 | 80 | 0.7～1.5 | |||
| QJ19-50 | 50 | 0.6～1.2 | Dual independent signal
Double independent tripping |
11 | |
| QJ19-80 | 80 | 0.7～1.5 |
