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Ground-fault circuit interrupter

A technology of leakage circuit breaker and main circuit, which is applied in the direction of circuits, electrical components, switches operated by ground fault current, etc., and can solve problems such as inability to switch

Inactive Publication Date: 2012-09-19
FUJI ELECTRIC FA COMPONENTS & SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in the JIS standard (JIS C 8371) that the domestic type complies with, in the case of high sensitivity (30mA sensitivity), for the purpose of human body protection, it is limited to non-delay type (high-speed operation type)
In other words, for the purpose of human body protection, the earth leakage circuit breaker 10 that can be set to delay cannot be switched to high sensitivity (30mA sensitivity)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0063] refer to Figure 1 to Figure 6 Embodiments of the present invention will be described. Such as figure 1 As shown, the earth leakage circuit breaker 100 has a zero-phase current transformer 110, a setting part 120 for sensitivity switching, a filter circuit 130, an electric leakage detection part 140, a setting part 150 for delay switching, a trip driving part 160 and a limit setting Section 170. Although the earth leakage circuit breaker 100 of this form has the same point as the conventional art, it demonstrates again for convenience of description.

[0064] The earth leakage circuit breaker 100 of such a circuit structure operates as follows.

[0065] In the zero-phase converter 110, the main circuit conductor (not shown) penetrates the iron core 110a, and if the load current flowing through the main circuit conductor includes an unbalanced current, 2 proportional to the unbalanced current is output from its output coil 110b. Secondary output current signal. The...

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Abstract

Disclosed is a ground-fault circuit interrupter that has been developed in a manner so as to be forcibly set to high speed operation at the same time that detection sensitivity is set from low sensitivity to high sensitivity by means of a mechanical setup with a simple configuration. In the ground-fault circuit interrupter, when a sensitivity changeover setting unit (120) is set to high sensitivity (30mA) by operating the sensitivity changeover extending slide switch (171b) of a constraint setting unit (170), a projecting part (171a) pushes out a time-delay changeover extending slide switch (172b), and a time-delay changeover setting unit (150) is forcibly set to high speed operation (0ms time delay).

Description

technical field [0001] The invention relates to a leakage circuit breaker for overcurrent protection and ground current protection in a low-voltage power distribution system. Background technique [0002] Leakage circuit breakers have the function of cutting off the AC circuit in the event of leakage to prevent accidents in the AC circuit. This earth leakage circuit breaker can switch the sensitivity current which is the value of the leakage current which performs its breaking (opening) operation, or can switch the delay time which is the set value of the delay operation time. [0003] Such earth leakage circuit breakers are roughly classified into Japanese domestic type earth leakage circuit breakers and foreign type (European and American type) earth leakage circuit breakers. First, an earth leakage circuit breaker of a domestic type in Japan will be described with reference to the drawings. Figure 7 It is a block diagram of a domestic type earth leakage circuit breaker ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H83/02
CPCH01H71/74H01H83/02H01H71/44H01H83/144
Inventor 浅野久伸冈本泰道
Owner FUJI ELECTRIC FA COMPONENTS & SYST CO LTD