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Fluid pressure driving device for circuit breaker

A fluid pressure and driving device technology, which is applied to fluid pressure actuating devices, power devices inside switches, portable mobile devices, etc., can solve problems such as the inability of the pilot valve to act, the change of the opening time and closing time of the circuit breaker, etc.

Inactive Publication Date: 2006-05-10
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the circuit breaking device described in the above-mentioned Japanese Patent Application Laid-Open No. 7-217401, if some abnormality occurs in one of the pilot valves, so that the pilot valve cannot operate, only the other pilot valve operates, resulting in the disconnection time of the circuit breaker. and the problem of closure time variation

Method used

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  • Fluid pressure driving device for circuit breaker
  • Fluid pressure driving device for circuit breaker
  • Fluid pressure driving device for circuit breaker

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Experimental program
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Embodiment Construction

[0024] Next, use Figure 1 to Figure 8 , an embodiment of the fluid pressure driving device of the circuit breaker of the present invention will be described. figure 1 It is a longitudinal sectional view showing a fluid pressure driving device of a circuit breaker. The circuit breaker is in a closed state (state being energized). figure 2 The following is also with figure 1 The same longitudinal sectional view has different operating states. figure 2 is the initial state of the usual open circuit operation, image 3 This is the initial state of the open-circuit operation when one of the open-circuit pilot valves does not operate. in addition, Figure 4 is the late state of the open circuit action, Figure 5 is an open circuit state (open circuit state), Figure 6 is the initial state in normal closed-circuit operation, Figure 7 It is the initial state of the closed-circuit operation when one of the closed-circuit pilot valves does not operate. Figure 8 is the late...

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PUM

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Abstract

The object of the present invention is to prevent the operating time from being affected even if there is a problem with the pilot valve in the fluid pressure drive device of the circuit breaker. The contact of the circuit breaker has a movable contact (1) and a fixed contact (2) that allow current to flow or break. A piston (5) is provided at the other end of the shaft on which the movable contact is installed. This piston is housed in the cylinder (4). The switching valve (13) switches the oil pressure of the driving piston. In order to switch this switching valve, pilot valves (50, 60) are provided. Each pilot valve has a pair of oppositely arranged valve bodies (53, 55, 63, 65) and springs (54, 64) connecting the valve bodies. One valve body can stroke until it comes into contact with the other valve body.

Description

technical field [0001] The present invention relates to a fluid pressure driving device for a circuit breaker, in particular to a fluid pressure driving device suitable for an electric circuit breaker. technical background [0002] In a conventional circuit breaker, as described in Japanese Patent Application Laid-Open No. 7-217401, for example, the hydraulic device of the high-voltage circuit breaker has a driving piston for a movable contact. In the closed state, the movable contact has two pistons connected to the high pressure tank, and the two pistons are driven by the high pressure fluid acting on it. When the circuit is blocked, the switching valve operates to form a circulation circuit on the low pressure side of the piston. The pilot valve for closing and the pilot valve for opening drive the switching valve. Then, the pilot valves for two circuit interruptions are connected to the switching valves. [0003] Patent Document 1: Japanese Patent Application Laid-Ope...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H33/34H01H3/24F15B11/00F15B15/00
CPCB25F1/02B25F3/00
Inventor 濑户信治武田康秀海老泽大辅内山正之渡边笃司河本英雄
Owner HITACHI LTD