Connection structure of tension spring type balance spring of double-arm folding type high-voltage alternating current isolating switch

Abstract

The invention relates to a connection structure of a tension spring type balance spring of a double-arm folding type high-voltage alternating current isolating switch. The connection structure comprises a crank arm, a tension spring, an adjusting joint, an adjusting screw rod and the like, wherein the adjusting joint is an 'n'-shaped frame; the opening end of the adjusting joint is hinged with the crank arm through an axle pin; a through hole for the rod part of the adjusting screw rod to pass through is formed at the other end, opposite to the opening end, of the adjusting joint; the head part of the adjusting screw rod is positioned in the 'n'-shaped frame; an axial gap is reserved between the head part of the adjusting screw rod and the adjusting joint; the rod part of the adjusting screw rod extends out of the through hole of the adjusting joint to be spirally connected with the tension spring; and the other end of the tension spring is hinged with a fixed support. The connection structure effectively avoids the rebound phenomenon in the on / off process of a main knife switch, balances the applied force of the tension spring and is stretched stably. The connection structure hasthe characteristics of reasonable structure, good balance effect of the tension spring, stable action, high reliability and the like.

Description

technical field [0001] The invention relates to a connection structure of a tension spring balance spring of a double-arm folding high-voltage AC isolating switch. Background technique [0002] The high-voltage isolating switch is a power device used to separate and close the circuit with voltage and no load in the power system. It plays an isolation role in the circuit. During maintenance, the high-voltage isolating switch can be used to form a clear disconnection point between the equipment under maintenance and the live equipment. , to ensure the safe operation and maintenance of personnel; in the closed state, it can reliably pass the normal working current and withstand the short-circuit fault current. In addition, the high-voltage isolating switch and the switch can also change the load operation mode of the power grid. It is widely used in the power system, and it has a great influence on the design, establishment and safe operation of substations and power plants, so...

AI Technical Summary

Problems solved by technology

However, in the operation of the current double-arm folding high-voltage isolating switch, it is found that when the switch is opened and closed, because the conductive tube, that is, the folded arm, is affected by the tension spring balance spring and the transmission mechanism, its operating force is relatively large, and the speed is relatively fast. In addition to the gravity moment of the folding arm itself, especially at the moment when the opening or closing action of the main switch blade is just completed, the folding arm is prone to a rebound action, which will lead to arcing, which will burn the dynamic and static contacts. In addition, the crank arm on the folding arm is directly connected to the tension spring. When the switch is opened and closed, the crank arm is in a rotational motion, and the crank arm directly pulls the tension spring. The force of the tension spring is not linear. Force, the operating force is large, the stability of the action is poor, and the anti-fatigue life of the extension spring is affected, so the failure of the extension spring balance spring will cause the disconnector to fail

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