Relay TWG-50, TWG-80, PCT-25

Gas relay designed for the protection of oil-filled equipment - transformers, auto-transformers and shunt reactors - from internal injuries, accompanied by evolution of gas, the decline in oil from the tank to the conservator. It is known that the only protection that responds to a series of dangerous damage inside the tank of the protected device is a gas. Inkjet relays used for protection of contactors oil-filled switches branches transformers and autotransformers from damage, accompanied by the appearance of accelerated oil flow from the tank to the conservator.

The last 20 years of power transformers in our country was equipped with mainly gas and jet relay production GDR.; To supply the relay from the GDR Zaporozhye transformer plant produced gas relay RGCS-66, which was also used as a jet to protect the switches branches transformers. By the beginning of the supply relay RGCS-66 in critical power systems have already been operated about 10 different types of gas relay domestic and foreign production. ; ; A significant portion of these relays, for a long time outdated and worn out, nevertheless, maintained and up to the present time. ; With the cessation of activity of the CMEA has created certain difficulties in the acquisition of relays German production. However, the experience of the operation of the relay BF series and URF showed that, despite an elaborate overall design, they have major drawbacks. ; Thus, the embedded device testing of the relay BF series can be tested only floats, responsive to the lowering of the oil level, and check the pressure plate, responsive to the speed of oil flow from the tank to the conservator and acting on the disconnection of the transformer, the design of the relay is not provided. Another disadvantage of relay BF and URF is unsatisfactory depreciation of the switches in the holders in the oil inside the switch housing, rotating on an axis. ; In some cases it was observed cracks and even the destruction of the glass body of the reed switch, which was discovered after transportation, and in the process of operation of the relay, and could cause failure protection. ; Finally, all used up to the present time the relay is allowed to perform only one tripping and alarm circuits that do not meet modern requirements for relay protection of electric equipment.