CN210724191U

CN210724191U - Leakage open-phase protection circuit breaker

Info

Publication number: CN210724191U
Application number: CN201922048703.2U
Authority: CN
Inventors: 陈丰余
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-11-22
Filing date: 2019-11-22
Publication date: 2020-06-09
Anticipated expiration: 2029-11-22

Abstract

The utility model provides an electric leakage lacks looks protection circuit breaker belongs to circuit breaker technical field. The technical problems that the existing circuit breaker generally has the functions of leakage and open circuit, but cannot realize the functions of leakage and open circuit due to phase failure and the like are solved. The zero sequence current transformer is sleeved on a connecting line of a disconnecting switch and a leading-out terminal of the leakage open-phase circuit breaker and a connecting line of a zero line, the zero sequence current transformer is connected with the electronic control module, the electronic control module can control the electrification or the outage of the first electromagnet, the disconnecting switch can be switched off through the tripper after the first electromagnet is electrified, the three live wires between the disconnecting switch and the zero sequence current transformer are respectively connected with the electric reactors, and the other ends of the three electric reactors are connected with the leading-out terminal of the zero line. The utility model discloses can realize lacking the phase protection on earth leakage protection's basis to whole electric leakage lacks the simple structure of looks circuit breaker, and stability is higher, only need increase three reactor can, the cost is lower.

Description

Leakage open-phase protection circuit breaker

Technical Field

The utility model belongs to the technical field of the circuit breaker, refer in particular to an electric leakage open-phase protection circuit breaker.

Background

The open phase of the circuit breaker is caused by two aspects of the external reason and the internal reason of the circuit breaker, wherein, the single-phase grounding short circuit fault of the circuit breaker accounts for more than ninety percent of the total class of all open phase faults, because the proportion of the short circuit in the phase is smaller, the fault generated by the unidirectional grounding is mostly caused by misoperation or a series of line short circuits, in addition, the open phase fault can be generated due to the asynchronous opening and closing of the switch, and the open phase fault can be also caused due to the refusing of the switch.

If the phase-loss fault occurs in the circuit breaker, the circuit breaker can have an unforeseen effect on a whole set of power supply system, and even a lot of negative sequence voltage or zero sequence voltage can be generated in the power grid, so that the power grid device is seriously damaged. When the circuit breaker is not switched on together, the whole power system generates a phase-loss fault in a short time and generates zero-sequence current in a short time, so that the sensitivity of the power system is shortened; the voltage generated by simultaneous closing is much lower than that generated by non-simultaneous closing, so that the damage of the non-simultaneous closing is not only terrible, but also has very serious consequences.

At present, the existing circuit breakers generally have the function of leakage circuit breaking, but no circuit breaker capable of realizing leakage and open-phase circuit breaking simultaneously exists.

Disclosure of Invention

The utility model aims at providing a circuit breaker that can respond to electric leakage and lack the looks homoenergetic.

The purpose of the utility model is realized like this:

the utility model provides an electric leakage open-phase circuit breaker, includes the inlet wire end of being connected with three-phase circuit and the leading-out terminal of being connected with the load, be connected with the knife switch between inlet wire end and the leading-out terminal, the cover is equipped with zero sequence current transformer on the connecting wire of knife switch and leading-out terminal, connecting wire between the inlet wire end of zero line and the leading-out terminal passes zero sequence current transformer, zero sequence current transformer is connected with electronic control module, electronic control module can control the circular telegram or the outage of first electro-magnet, can make the disconnection of knife switch through the release after the circular telegram of first electro-magnet, its characterized in that: and three live wires between the disconnecting switch and the zero sequence current transformer are respectively connected with reactors, and the other ends of the three reactors are connected with the wire outlet end of the zero line.

In the aforementioned leakage-phase-loss circuit breaker, the reactor is a resistor, and the three resistors have the same resistance value. The reactor can be an inductor, a resistor or a capacitor, wherein the cost of the selected resistor is the minimum.

In the above-mentioned leakage phase-loss circuit breaker, the three wiring ports at the rear side of the disconnecting link switch are respectively connected with a second electromagnet, and when the current passing through the second electromagnet exceeds a rated value, the tripping device can be driven to work to disconnect the disconnecting link switch.

In the above-mentioned leakage phase-loss circuit breaker, the release is a hydraulic release or a bimetallic release.

In foretell electric leakage open-phase circuit breaker, including test resistance and the button switch who establishes ties and set up, test resistance's one end with one of the three wiring port of disconnecting switch rear side is connected, button switch's one end is connected with the leading-out terminal of zero line.

The working principle of the utility model is as follows: when the protected circuit has electric leakage or human body electric shock, as long as the leakage current reaches the rated current value, the zero sequence current transformer senses the current and sends a signal to the electronic control module, and the electronic control module receives the signal and then energizes the first electromagnet to drive the release to release, so that the disconnecting switch is disconnected to realize the circuit breaking function; when no phase loss occurs in the protected circuit, the voltages acting on the ends of the three reactors connected with the zero line are all 0, no current passes through the reactors, and the tripper does not work; when one or two phases are absent in a protected circuit, voltage is applied to one or two corresponding reactors, current passes through the reactors, a secondary winding of the zero-sequence current transformer generates current after the zero-sequence current transformer senses the current and sends a signal to the electronic control module, and the electronic control module receives the signal and then energizes the first electromagnet to drive the release to release, so that the disconnecting switch is disconnected to realize the function of circuit breaking; the utility model discloses can realize lacking the phase protection on earth leakage protection's basis to whole electric leakage lacks the simple structure of looks circuit breaker, and stability is higher, only need increase three reactor can, the cost is lower.

Compared with the prior art, the utility model outstanding and profitable technological effect is:

the utility model discloses can realize lacking the phase protection on earth leakage protection's basis to whole electric leakage lacks the simple structure of looks circuit breaker, and stability is higher, only need increase three reactor can, the cost is lower.

Drawings

Fig. 1 is a schematic circuit diagram of the present invention.

In the figure, 1, a zero sequence current transformer; 2. a first electromagnet; 3. a knife switch; 4. a release; 5. a reactor; 6. a second electromagnet; 7. testing the resistance; 8. a push button switch; 9. and an electronic control module.

Detailed Description

The invention will be further described in the following with specific embodiments in conjunction with the drawings, see fig. 1:

this electric leakage open-phase circuit breaker includes the inlet wire end of being connected with three-phase circuit and the leading-out terminal of being connected with the load, be connected with the knife switch between inlet wire end and the leading-out terminal, the cover is equipped with zero sequence current transformer 1 on the connecting wire of knife switch and leading-out terminal, connecting wire between the inlet wire end of zero line and the leading-out terminal passes zero sequence current transformer 1, zero sequence current transformer 1 is connected with electronic control module 9, electronic control module 9 can control the circular telegram or the outage of first electro-magnet 2, can make the knife switch disconnection through release 4 after first electro-magnet 2 circular telegram, be connected with reactor 5 on three live wires between knife switch and the zero sequence current transformer 1 respectively, the other end of three reactor 5 all is connected with the leading-out terminal of zero line.

Further, the reactor 5 is a resistor, and the three resistors have the same resistance value; the three wiring ports on the rear side of the disconnecting link switch are respectively connected with a second electromagnet 6, and when the current passing through the second electromagnet 6 exceeds a rated value, the tripper 4 can be driven to work to disconnect the disconnecting link switch; the release 4 is a hydraulic release 4 or a bimetallic release 4.

Furthermore, this electric leakage phase-lack circuit breaker is including the test resistance 7 and the button switch 8 that establish ties and set up, and one end and the knife switch rear side of test resistance 7 one of three wiring port are connected, and button switch 8's one end is connected with the leading-out terminal of zero line.

When the leakage circuit breaker works, when leakage exists in a protected circuit or a person gets an electric shock, as long as the leakage current reaches a rated current value, the zero sequence current transformer 1 senses the current and sends a signal to the electronic control module 9, and the electronic control module 9 receives the signal and then energizes the first electromagnet 2 to drive the release 4 to release, so that the disconnecting switch is disconnected to realize a circuit breaking function, wherein the working principle of the leakage circuit breaking is the same as that of a common leakage circuit breaker on the market, and detailed description is omitted; when no phase loss occurs in the protected circuit, the voltages acting on the ends, connected with the zero line, of the three reactors 5 are all 0, no current passes through the reactors 5, and the tripper 4 does not work; when one or two phases are absent in a protected circuit, voltage is applied to one or two corresponding reactors 5, current passes through the reactors 5, a secondary winding of the zero-sequence current transformer 1 generates current after sensing the current and sends a signal to the electronic control module 9, and the electronic control module 9 receives the signal and then energizes the first electromagnet 2 to drive the release 4 to release, so that the disconnecting switch is disconnected to realize a circuit breaking function; the utility model discloses can realize lacking the phase protection on earth leakage protection's basis to whole electric leakage lacks the simple structure of looks circuit breaker, and stability is higher, only need increase three reactor 5 can, the cost is lower.

The above-mentioned embodiment is only the preferred embodiment of the present invention, and does not limit the protection scope of the present invention according to this, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. The utility model provides an electric leakage open-phase protection circuit breaker, includes the inlet wire end of being connected with three-phase circuit and the leading-out terminal of being connected with the load, be connected with the knife switch between inlet wire end and the leading-out terminal, the cover is equipped with zero sequence current transformer on the connecting wire of knife switch and leading-out terminal, and the connecting wire between the inlet wire end of zero line and the leading-out terminal passes zero sequence current transformer, zero sequence current transformer is connected with electronic control module, electronic control module can control the circular telegram or the outage of first electro-magnet, can make the disconnection of knife switch through the release after the circular telegram of first electro-magnet, its characterized in that: and three live wires between the disconnecting switch and the zero sequence current transformer are respectively connected with reactors, and the other ends of the three reactors are connected with the wire outlet end of the zero line.

2. An earth leakage open-phase protection circuit breaker according to claim 1, characterized in that: the reactor is a resistor, and the resistance values of the three resistors are the same.

3. An earth leakage open-phase protection circuit breaker according to claim 1, characterized in that: and the three wiring ports at the rear side of the disconnecting link switch are respectively connected with a second electromagnet, and when the current passing through the second electromagnet exceeds a rated value, the second electromagnet can drive a release to work to disconnect the disconnecting link switch.

4. An earth leakage open-phase protection circuit breaker according to claim 1, characterized in that: the tripper is a hydraulic tripper or a bimetallic tripper.

5. An earth leakage open-phase protection circuit breaker according to claim 1, characterized in that: including the test resistance and the button switch that establish ties and set up, the one end of test resistance with one of the three wiring port of switch rear side is connected, button switch's one end is connected with the leading-out terminal of zero line.