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Overvoltage and electric leakage integrated protection circuit breaker

An overvoltage protection and comprehensive protection technology, which is applied in the protection of overvoltage response, emergency protection circuit devices, circuit devices, etc., can solve the problems of high product cost, burning of electromagnetic relay coils, and no overvoltage protection. To achieve the effect of high working life and reliability

Active Publication Date: 2015-03-04
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to power supply network failure, equipment switching, phase error, line resonance and other reasons, power frequency overvoltage faults often occur on power supply lines, and power frequency overvoltage will overload or even burn electrical equipment
[0004] General leakage circuit breakers do not have the function of overvoltage protection. There are several open technologies to realize the function of overvoltage protection on leakage circuit breakers, but all of them have defects and deficiencies: for example, a piezoresistor is used alone or a current-limiting resistor is connected in series. The method (utility model patent 200520075916.x; 200520075915.5, etc.), when the overvoltage of the input power line reaches the breakdown voltage of the varistor, the resistance of the varistor decreases, and a current flows, which makes the zero-sequence current mutual inductance The voltage signal is generated on the secondary side of the device, and the electronic switch (silicon controlled rectifier or other switching circuit) is activated to make the relay act and push the circuit breaker to switch.
This technology not only has complex structure and high product cost, but also the added electronic circuit itself is extremely vulnerable to overvoltage damage, so the leakage circuit breaker made by this technology has low reliability
In addition, the leakage circuit breaker products manufactured by the prior art have a high failure rate, and the failures are mainly as follows: 1) no tripping due to leakage (the leakage fault occurs in the equipment connected to the load end, but the leakage circuit breaker does not operate); 2) tripping without leakage (even if Disconnect the load end, it will jump when it is closed, and it cannot be closed)
The main reasons for the failure are: 1) The electromagnetic relay coil in the leakage circuit breaker is burned due to the overvoltage of the power supply; 2) The trigger circuit of the leakage protection is destroyed due to the overvoltage of the power supply and other reasons

Method used

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  • Overvoltage and electric leakage integrated protection circuit breaker

Examples

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Embodiment 1

[0031] Such as figure 1 As shown, the overvoltage and leakage comprehensive protection circuit breaker of this embodiment includes a single-phase power supply disconnect switch 8 and a leakage / overvoltage protection part, and the leakage / overvoltage protection part includes a first overvoltage protection component 1, a zero-sequence Current transformer 2 (L / N in the figure is the power supply terminal, L1 / N is the load terminal), electromagnetic relay 3, leakage protection trigger circuit 4 and trip linkage mechanism 5, and also includes test resistor 6 and test button 7.

[0032] Such as figure 2 As shown, the first overvoltage protection component includes a zinc oxide varistor (MOV) 11 and a PTC thermistor (PTCR) 12 located in the encapsulation layer, and one side electrode of the varistor 11 is connected to the The electrodes on one side of the PTC thermistor sheet 12 are closely connected together, and the lead wires are welded to form a common terminal lead-out 15, and...

Embodiment 2

[0046] Such as image 3 As shown, the overvoltage and leakage comprehensive protection circuit breaker of the present embodiment includes a three-phase power supply circuit breaker 8 (A, B, and C in the figure are three phase wires at the power supply end, and U, V, and W are three phase wires at the load end. ) and the leakage / overvoltage protection part, the leakage / overvoltage protection part includes a first overvoltage protection component 1, a zero-sequence current transformer 2, an electromagnetic relay 3, a leakage protection trigger circuit 4 and a tripping linkage mechanism 5, test Resistor 6, test button 7 and two second overvoltage protection components 9.

[0047] The first overvoltage protection component includes a zinc oxide varistor (MOV) and a PTC thermistor (PTCR) located in the encapsulation layer, one side electrode of the varistor and the PTC thermistor The electrodes on one side are closely connected together and lead wires are welded to form a common t...

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Abstract

The invention discloses an overvoltage and electric leakage integrated protection circuit breaker, comprising a shutdown switch, a first overvoltage protection component, a second overvoltage protection component, a zero-sequence current transformer, an electromagnetic relay, a tripping linkage mechanism and an electric leakage protection triggering circuit; the first overvoltage protection component comprises a voltage dependent resistor chip and a PTC thermistor chip located in an encapsulating layer and has three leading-out terminals; the second overvoltage protection component comprises a voltage dependent resistor chip and a PTC thermistor chip located in an encapsulating layer and has two leading-out terminals; when the shutdown switch is a single-phase power switch, only one first overvoltage protection component is installed; when the shutdown switch is a three-phase power switch, one overvoltage protection component and two overvoltage protection components are installed; when the electric leakage or the overvoltage in any phase of the three-phase power supply occurs, the shutdown switch can trip off immediately. The circuit breaker has an overvoltage and electric leakage integrated protection function; and the safety and the reliability of the circuit breaker are much better than that of the present electric leakage circuit breaker.

Description

technical field [0001] The invention relates to a circuit breaker, in particular to a circuit breaker with comprehensive overvoltage and leakage protection. Background technique [0002] Leakage circuit breakers (or leakage switches) are commonly used low-voltage power distribution switching devices to protect personal safety and equipment and property safety. [0003] Due to power supply network failure, equipment switching, phase error, line resonance and other reasons, power frequency overvoltage faults often occur on power supply lines, and power frequency overvoltage will overload or even burn electrical equipment. [0004] General leakage circuit breakers do not have the function of overvoltage protection. There are several open technologies to realize the function of overvoltage protection on leakage circuit breakers, but all of them have defects and deficiencies: for example, a piezoresistor is used alone or a current-limiting resistor is connected in series. The me...

Claims

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Application Information

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IPC IPC(8): H02H3/20H02H3/32
Inventor 卢振亚
Owner SOUTH CHINA UNIV OF TECH
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