QJ 25 series double float ball gas relay
The QJ-25 series dual float gas relay (dual float structure) is a protective device used in the on-load tap changer of oil-immersed transformers. The gas relay is installed on the connecting pipe between the transformer tank cover and the oil tank, and a vent pipe can be installed to achieve ground venting and sampling. When an internal fault in the transformer causes gas to be generated due to oil decomposition or causes oil surge, the relay contacts will operate to connect the specified control circuit and promptly issue a signal or automatically cut off the transformer switch.
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Product Description
Product Introduction
The QJ-25 series dual float gas relay (dual float structure) is a protective device used in the on-load tap changer of oil-immersed transformers. The gas relay is installed on the connecting pipe between the transformer tank cover and the oil tank, and a vent pipe can be installed to achieve ground venting and sampling. When an internal fault in the transformer causes gas to be generated due to oil decomposition or causes oil surge, the relay contacts will operate to connect the specified control circuit and promptly issue a signal or automatically cut off the transformer switch.
Model Description
Example 1: QJ9-25A-J indicates a gas relay with a pipe diameter of 25mm, designed for the 9th time, with a gas sampling box and memory function.
Example 2: QJ35-25 indicates a gas relay with a pipe diameter of 25mm, designed for the 35th time.
Conditions of Use
Operating temperature: -45℃~100℃
Installation method: The relay pipeline axis should be parallel to the transformer tank cover. The end leading to the oil tank is allowed to be slightly higher, but the inclination of its axis to the horizontal plane should not exceed 4%.
Product Model and Wiring Diagram
| Accumulated Gas Volume (mL) | Oil Speed Setting Range (m/s) | Factory Setting Value of Oil Flow Rate (m/s) | Number of Output Terminals |
| 200-250 | 1.0±0.1 | 1.0±0.1 | 2 |
| Model | Contact Description | Wiring Diagram |
| QJ9-25 | 1 Alarm 2 Trip 1 Low Oil (4 pairs of normally open contacts, Dual Float) |
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| QJ13-25 | 2 Alarm 2 Trip (4 pairs of normally open contacts, Single Float) |
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| QJ15-25 | 1 Alarm 1 Trip 1 Low Oil (2 pairs of normally open contacts, Dual Float) |
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| QJ16-25 | 2 Alarm 2 Trip 1 Low Oil (5 pairs of normally open contacts, Dual Float) |
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| QJ17-25 | 1 Alarm 1 Trip (2 pairs of normally open contacts, Single Float) |
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| QJ19-25 | 1 Alarm 1 Trip 1 Low Oil (3 pairs of normally open contacts, Dual Float) |
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| QJ20-25 | 1 Alarm 2 Trip (3 pairs of normally open contacts, Single Float) |
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| QJ21-25 | 3 Alarm 3 Trip (6 pairs of normally open contacts, Single Float) |
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| QJ22-25 | 3 Alarm 2 Trip (5 pairs of normally open contacts, Single Float) |
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| QJ23-25 | 1 Trip 1 Low Oil (2 pairs of normally open contacts, Single Float) |
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| QJ24-25 | 2 Trip 1 Low Oil (3 pairs of normally open contacts, Single Float) |
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| QJ26-25 | 2 Alarm 3 Trip (5 pairs of normally open contacts, Single Float) |
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| QJ30-25 | 3 Trip (3 pairs of normally open contacts) |
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| QJ31-25 | 1 Alarm 3 Trip 1 Low Oil (5 pairs of normally open contacts, Dual Float) |
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| QJ32-25 | 2 Alarm 1 Trip (2 pairs of normally open contacts, 1 pair of normally closed contacts, Single Float) |
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| QJ33-25 | 2 Alarm 2 Trip (4 pairs of normally open contacts, 4 pairs of normally closed contacts, Single Float) |
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| QJ35-25 | 1 Alarm 3 Trip (4 pairs of normally open contacts, Dual Float) |
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| Power Supply Type | Operating Voltage | Operating Current | Description |
| DC | 220V | 0.3A | Time Constant S≤5×10⁻³ -3 S |
| AC | Power Factor Cos φ≤0.6 |
Appearance and Installation Dimensions
Unit (mm)
| D1 | D2 | D3 | D4 | D5 | D6 | H1 | H2 | H3 | L1 | L2 | L3 | L4 |
| φ25 | φ36 | φ64 | φ85 | φ115 | φ14 | 206.5 | 150 | 290 | 200 | 170 | 15 | 470 |
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