QJ3-40 Gas relay used for oil transformer

This product is mainly used to protect various types of oil-immersed fully sealed transformers. 1. Working principle: During normal operation of the transformer, the internal part of the gas relay is filled with transformer oil. When there is a fault in the transformer, the transformer oil decomposes to produce gas or the temperature drops and the oil is less. At this time, the gas collects in the air chamber of the relay, forcing the oil level to drop, and the float drops with the oil level. When the oil level drops to a certain level, the alarm signal contact is connected first, and the alarm signal occurs. If the oil level continues to drop, when it reaches a certain level, the cut-off signal contact is connected, and the cut-off signal is sent to cut the transformer from the power grid, so as to protect the transformer. 2. Main parameters 2.1 Working temperature: - 30-95 ℃ 2.2 Pipe diameter: 40mm 2.3 Sealing test pressure: 0.2Mpa 20min 2.4 Wiring terminal to ground: AC 2KV 1min 2.5 Contact capacity: DC/AC 220V 0.3A