Metal bellows compensator products for high-voltage combined electrical appliances are mainly used in high-voltage power transmission and transformation systems. A set of high-voltage power transmission and transformation system has several combined electrical stations, and each combined electrical station uses dozens of metal bellows compensators.

The construction and renovation of high-voltage power transmission and transformation systems is the focus of national power construction. The annual domestic demand for metal bellows compensators for high-voltage combined electrical appliances is about 200 million yuan.

The metal corrugated compensator for high-voltage combined electrical appliances is used as the connecting part of the connecting part between the two adjacent equipment shells of the GIS system. It is mainly used for installation and adjustment, absorbing the relative displacement between the foundations, and absorbing the displacement caused by the expansion and contraction of thermal expansion and contraction. .

This compensator is different from the compensator for ordinary pipelines. The ordinary compensator is mostly used under high stress and low cycle times, while the metal bellows compensator for high-voltage combined electrical appliances is used under low stress and high cycle times, and the number of cycles is more than 1000 times. above.

Therefore, there are different requirements for the pressure resistance, compensation amount and fatigue life of metal corrugated compensators for high-voltage combined electrical appliances. Because it works in a high electric field gradient environment, the compensator is not only a mechanical component, but also an electrical component. In addition to meeting the general performance of ordinary compensators, the inner surface of the compensator is also required to be smooth and free of sharp corners, otherwise it will produce Discharge, affecting the insulation of the product.

Since the internal medium of the entire combined electrical appliance is air gas or other arc extinguishing and insulating gas, the tightness of the compensator is very high, and the corrugated compensator for ordinary pipelines is difficult to meet the above requirements. At the same time, because the support capacity of the high-voltage combined electrical appliance is small, and the internal pressure thrust of the corrugated compensator is relatively large, it is easy to have an adverse effect on the connected equipment. The pressure-balanced corrugated compensator balances the thrust caused by the internal pressure through its own structure, the thrust does not act or acts less on the connected equipment, and can ensure its own axial compensation function.

The pressure balance type corrugated compensator of this structure is composed of 4 flanges, 2 working bellows, 1 balance bellows and balance tie rods. The three bellows are connected by the flange and the connecting pipe. The balance rod passes through the rod hole on the flange and is fixed on the three flanges by nuts. The left and right numbers are equal. It should be evenly arranged in the circumferential direction. The key to the design of the corrugated compensator of this structure is that the effective area of the balancing bellows is twice that of the working bellows, so that the thrust to the outside caused by the internal pressure of the working bellows is passed through the balance rod by the balance bellows due to the internal pressure. Thrust is counteracted instead of acting on the equipment connected to the compensator

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