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A thermal magnetic tripper

A technology of thermal magnetic release and tripping, which is applied in the direction of protection switch operation/release mechanism, etc. It can solve the problems of unreliable action, complex structure, cumbersome tripping process, etc., and achieve the effect of reliable action and simple tripping process

Active Publication Date: 2012-02-15
CHANGSHU SWITCHGEAR MFG CO LTD (FORMER CHANGSHU SWITCHGEAR PLANT)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, this structure is more complicated, and the process of jumping buttons is cumbersome.
Moreover, in the thermal-magnetic release structure with thermal-magnetic fault indication (display) of the circuit breaker, the drawbar of the circuit breaker is divided into two shaft-connected thermal adjustment drawbars and magnetic trip drawbars, which are used for thermal overload protection respectively. And short-circuit and overload play a protective role. If the above-mentioned push rod structure is used again, after the subsequent functional module (which can provide a tripping signal such as a leakage functional module) of the circuit breaker detects the working current, the functional module release will strike The push rod installed in the upper cover of the circuit breaker, and then the push rod hits the draw rod of the thermal magnetic tripper, but no matter whether the thermal adjustment draw rod or the magnetic trip draw rod is hit, a false indication will be generated, and the action is unreliable, so that the above-mentioned The situation that the push rod of the thermal magnetic release of the structure directly hits the drawbar is no longer applicable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: The push rod 6 is installed between the bracket 2 and the base 1.

[0024] The thermal-magnetic trip unit of this embodiment is suitable for circuit breakers with adjustable and non-adjustable thermal and magnetic fields, as well as circuit breakers with fault indication.

[0025] Please see figure 1 with figure 2 , The base 1 on which four thermomagnetic protection devices 4 can be installed is given, specifically: on the side of the length of the base 1 that is currently figure 1 The front side of the position shown is divided into four thermo-magnetic protection device accommodating cavities 14, and the four thermo-magnetic protection devices 4 are arranged in the four thermo-magnetic protection device accommodating cavities 14, thereby forming a four-pole circuit breaker Based on this principle, if three thermomagnetic protection devices 4 are used, they will behave as a three-pole circuit breaker. Therefore, this embodiment does not constitute a limitation...

Embodiment 2

[0030] The second embodiment: the push rod 6 is installed on the base 1.

[0031] Please see Figure 4 with Image 6 , This embodiment is applicable both with the bracket 2 and without the bracket 2. The barrier 13 on the base 1 for separating the thermomagnetic protection device 4 is extended with a section of boss 131, on the boss 131 A guide protrusion 1311 is additionally provided, and the guide hole 621 of the push rod 6 is matched with the guide protrusion 1311.

[0032] When the circuit breaker has a bracket or does not have a bracket 2, the upper limit of the push rod 6 can be limited by a stop 91 in the upper cover 9 of the circuit breaker, and the upper cover 9 is closed with the base 1 Afterwards, the stop protrusion 91 and the guide chute 11 on the base 1 are combined to form a guide chute hole, so that the push rod 6 can be restricted. When the push rod 6 is reset, it moves to the stop protrusion 611 and the push rod 6 The stop protrusion 91 in the upper cover 9 stops...

Embodiment 3

[0034] Embodiment 3: The push rod 6 is installed on the bracket 2.

[0035] Please see Figure 5 with Figure 7 In the bracket 2 of this embodiment, on the structure of the bracket 2 of the first embodiment, a sliding guide hole 216 is opened in the corresponding part of the notch stop protrusion 211, so that the push rod 6 is installed in the guide sliding hole 216 of the bracket 2, and the push rod A boss 623 is additionally provided on the 6 to limit the resetting of the push rod 6. When the push rod 6 is reset, it moves until the boss 623 contacts the side wall 92 of the upper cover 9 ( Figure 7 Show), that is, stop moving, so that the push rod 6 will not fall off from the sliding guide hole 216.

[0036] The thermal-magnetic trip unit of this embodiment is suitable for circuit breakers with thermal-magnetic adjustable and thermal-magnetic non-adjustable, and also suitable for circuit breakers with fault indication.

[0037] Please combine Figure 1 to Figure 5 , The thermal-ma...

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Abstract

A thermal magnetic tripper is arranged on a molded case circuit breaker and is used to directly hit the tripper of the locking device of the operating mechanism of the molded case circuit breaker. It includes a base, a drawbar on the base and a set of thermal magnetic protection devices installed on the base, and is characterized in that it also includes a The push rod corresponding to the locking device of the mechanism is used to actuate the locking device of the operating mechanism of the circuit breaker. Advantages: Since there is no intermediate transition link, the tripping process is simple, and there will be no false indication in the structure of the thermal magnetic release of the circuit breaker with thermal magnetic fault indication, ensuring reliable operation.

Description

Technical field [0001] The invention relates to a thermal-magnetic trip device, which is arranged on a plastic case circuit breaker and is used to directly strike a trip device of a locking device of an operating mechanism of the plastic case circuit breaker. Background technique [0002] Molded case circuit breakers are suitable for distribution networks with AC 50Hz, insulation voltage of 800V, and rated operating current of 690A and below, to distribute electrical energy and protect circuits, power supplies and electrical equipment. The circuit breaker has overload, short circuit and undervoltage protection functions to avoid damage to the circuit and power equipment. [0003] The protection functions of molded case circuit breakers mainly include thermal overload protection, short circuit protection, delay protection, electronic protection, and leakage protection. When implementing protection, circuit breakers with traditional mechanical structures generally focus on thermal o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H71/40
Inventor 唐维春吴海霞陈志刚王炯华管瑞良
Owner CHANGSHU SWITCHGEAR MFG CO LTD (FORMER CHANGSHU SWITCHGEAR PLANT)