QJ-40 type gas relayDetailed product description：

Product Structure Features
When the transformer is running normally, the interior of the gas relay is filled with transformer oil. When there is a fault inside the transformer, the gas generated by the decomposition of transformer oil accumulates in the relay's gas collection chamber. The air pressure forces the oil level to drop, and the float ball drops with the oil level, and the magnetic switch A or B is linked to close. When the gas reaches 170mI, the magnetic switch A is attracted, the signal circuit is connected, and an alarm signal is issued. If the oil level in the fuel tank drops due to other reasons (such as electrical leakage, etc.), it will also act on the signal circuit to issue an alarm signal. When a serious fault occurs inside the transformer, a large amount of gas will be generated. When the gas reaches 260mI or more, magnetic switch B will be closed, triggering a trip device to disconnect the transformer from the power grid, thus achieving the purpose of protecting the transformer.

Technical parameters of QJ-40 gas relay

Manufacture according to the drawings and technical specifications
Pipeline diameter: ф 40mm
Alarm signal gas volume: 170mL ± 10%
Cut off (trip) signal gas volume: 260mL ± 10%
Contact capacity: DC/AC 220V 0.3A
Sealing test pressure: 200kPa
Insulation withstand voltage test: 2000V
Anti water spray test: protection level IPX5
Seismic resistance test: frequency 4-20Hz, speed 40M/S2

QJ-40 gas relay