CN207572951U - Three-phase and four-line leakage switch - Google Patents
Three-phase and four-line leakage switch Download PDFInfo
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- CN207572951U CN207572951U CN201721675713.3U CN201721675713U CN207572951U CN 207572951 U CN207572951 U CN 207572951U CN 201721675713 U CN201721675713 U CN 201721675713U CN 207572951 U CN207572951 U CN 207572951U
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Abstract
The utility model discloses three-phase and four-line leakage switch, including zero sequence current mutual inductor, its input terminal is connected with all phases and zero curve of monitored circuit, for detecting the current phasor of monitored circuit and whether being zero, when the current phasor of the monitored circuit of detection is with being not zero, zero sequence current mutual inductor output mutual voltage signal；The output terminal of controller, signal input part and zero sequence current mutual inductor is connected, for receiving mutual voltage signal；Buckle releaser is connected with the signal output end of controller, and when controller receives the mutual voltage signal of zero sequence current mutual inductor output, controller is then outputed signal in buckle releaser so that buckle releaser acts, and cuts supply network；Three phase mains is connected respectively with zero sequence current mutual inductor, controller and buckle releaser.This switch can detect insulation fault automatically and cut supply network, electric shock accidents caused by so as to prevent electrical equipment and electric wiring electric leakage.
Description
Technical Field
The utility model relates to a leakage switch, concretely relates to three-phase four-wire leakage switch.
Background
Along with the continuous improvement of the living standard of human beings, the popularization degree of household appliances is also greatly improved, great convenience is brought to our life, and meanwhile, electric shock accidents caused by electric leakage of electrical equipment and an electric circuit are increased day by day. According to statistics, the number of people who die by electric shock is about 8000 every year, and the life and property safety of human beings are seriously threatened by electric leakage! The main cause of the electrical leakage is the occurrence of an electric shock accident due to the occurrence of electrical leakage caused by poor circuit contact, damage and aging, short circuit of the circuit, and the like.
Disclosure of Invention
An object of the utility model is to overcome above-mentioned prior art not enough, provide a three-phase four-wire leakage switch to reduce the power consumption potential safety hazard.
In order to achieve the above purpose, the technical scheme of the utility model is that:
the three-phase four-wire leakage switch comprises a zero-sequence current transformer, a controller, a tripper and a three-phase power supply; wherein,
the input end of the zero-sequence current transformer is connected with all phases and zero lines of the monitored line and used for detecting whether the sum of the current vectors of the monitored line is zero or not, and when the sum of the current vectors of the monitored line is not zero, the zero-sequence current transformer outputs a mutual inductance voltage signal;
the signal input end of the controller is connected with the output end of the zero sequence current transformer and is used for receiving mutual inductance voltage signals;
the tripper is connected with the signal output end of the controller, and when the controller receives a mutual inductance voltage signal output by the zero sequence current transformer, the controller outputs a signal to the tripper so that the tripper acts to cut off a power supply network;
and the three-phase power supply is respectively connected with the zero-sequence current transformer, the controller and the tripper to provide voltage for the work of the zero-sequence current transformer, the controller and the tripper.
The three-phase four-wire leakage switch further comprises an alarm, the alarm is connected with the signal output end of the controller, when the controller receives a mutual inductance voltage signal output by the zero sequence current transformer, the controller outputs a signal to the alarm, and the alarm sends alarm information.
The three-phase four-wire leakage switch further comprises a communication unit and a terminal, wherein the communication unit is connected with a signal output end of the controller and is used for transmitting a result of whether the controller receives a voltage signal output by the zero sequence current transformer to the terminal.
The communication unit is a GSM communication unit.
The controller is a CATCSC54123A chip.
The alarm is an acousto-optic alarm lamp.
Compared with the prior art, the utility model, its beneficial effect lies in:
the three-phase four-wire leakage switch provided by the embodiment can automatically detect the insulation fault and cut off the power supply network, thereby preventing electric shock accidents caused by electric leakage of electrical equipment and electrical lines. The three-phase four-wire leakage switch is powered by a three-phase power supply, and the protection function of the leakage switch can still normally act due to the lack of any one-phase or two-phase power supply.
Drawings
Fig. 1 is a schematic diagram of a three-phase four-wire leakage switch provided in embodiment 1 of the present invention;
FIG. 2 is a schematic diagram of the circuit of FIG. 1;
fig. 3 is a schematic diagram of a three-phase four-wire leakage switch provided in embodiment 2 of the present invention;
FIG. 4 is a schematic circuit diagram of a GSM communication unit;
in the figure: 1. a zero sequence current transformer; 2. a controller; 3. a release; 4. a three-phase power supply; 5. an alarm; 6. a communication unit; 7. and (4) a terminal.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example 1:
referring to fig. 1, a schematic diagram of a three-phase four-wire leakage switch provided in this embodiment is shown, where the three-phase four-wire leakage switch includes a zero-sequence current transformer 1, a controller 2, a release 3, and a three-phase power supply 4.
The input end 1 of the zero sequence current transformer is connected with all phases and zero lines of a monitored circuit to form a primary side of the zero sequence current transformer 1, and the primary side is used for detecting whether the sum of current vectors of the monitored circuit is zero or not, when the monitored circuit is detected to have an insulation fault, the load side has earth leakage current, the vector of the zero sequence transformer 1 is not zero, mutual induction voltage is generated in a secondary winding of the zero sequence transformer 1, and therefore mutual induction voltage signals are output. The signal input end of the controller 2 is connected with the output end of the zero sequence current transformer 1 and is used for receiving mutual inductance voltage signals; the signal output end of the controller 2 is connected with the release 3, when the controller 2 receives a mutual inductance voltage signal output by the zero sequence current transformer 1, the controller 2 outputs a signal to the release 3, so that the release 3 acts to cut off a power supply network, and a protection effect is achieved; the three-phase power supply 4 is respectively connected with the zero-sequence current transformer 1, the controller 2 and the tripper 3 to provide voltage for the work of the zero-sequence current transformer 1, the controller 2 and the tripper 3, and the protection function of the leakage switch can still normally act due to the fact that any one-phase or two-phase power supply is lacked because the three-phase power supply 4 is adopted for supplying power.
As shown in fig. 2, for the circuit schematic diagram of the three-phase four-wire leakage switch provided in this embodiment, ABC three-phase power supply is adopted, and P2 is a zero-sequence transformer. The protection function of the leakage switch can still normally operate due to the lack of any one-phase or two-phase power supply, and when the P2 detects the occurrence of an insulation fault, the controller U1 controls the action of a release.
From the above analysis, the three-phase four-wire leakage switch provided by the embodiment can automatically detect the insulation fault and cut off the power supply network, thereby preventing the electric shock accident caused by the leakage of the electrical equipment and the electrical line. The three-phase four-wire leakage switch is powered by a three-phase power supply, and the protection function of the leakage switch can still normally act due to the lack of any one-phase or two-phase power supply.
Specifically, in the present embodiment, the controller described above employs a cattsc 54123A chip. That is, in the present application, the controller is prior art, and the present application does not relate to any improvement of the control program.
Example 2
The embodiment is basically the same as the embodiment 1, except that the embodiment further comprises an alarm 5, as shown in fig. 3, the alarm 5 is connected with a signal output end of the controller 2, and when the controller 2 receives a mutual inductance voltage signal output by the zero sequence current transformer 1, the controller 2 outputs a signal to the alarm 5, so that the alarm sends out alarm information to remind related workers in time. Specifically, in the present embodiment, the alarm 5 is an audible and visual alarm lamp to further prompt the relevant staff in time.
As a preferred embodiment, the three-phase four-wire leakage switch further includes a communication unit 6 and a terminal 7, as shown in fig. 3, the communication unit 6 is connected to a signal output end of the controller 2, and is configured to transmit a result of whether the controller 2 receives the output voltage signal of the zero-sequence current transformer to the terminal 7. That is, the insulation fault condition can be timely transmitted to the terminal 7 through the communication unit 6, so that even if the operator is far away from the switch, the operator can know the relevant detection result at the first time.
Specifically, the communication unit 5 is a GSM communication unit, and a schematic circuit diagram is shown in fig. 4.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Claims (6)
1. The three-phase four-wire leakage switch is characterized by comprising a zero sequence current transformer, a controller, a tripper and a three-phase power supply; wherein,
the input end of the zero-sequence current transformer is connected with all phases and zero lines of the monitored line and used for detecting whether the sum of the current vectors of the monitored line is zero or not, and when the sum of the current vectors of the monitored line is not zero, the zero-sequence current transformer outputs a mutual inductance voltage signal;
the signal input end of the controller is connected with the output end of the zero sequence current transformer and is used for receiving mutual inductance voltage signals;
the tripper is connected with the signal output end of the controller, and when the controller receives a mutual inductance voltage signal output by the zero sequence current transformer, the controller outputs a signal to the tripper so that the tripper acts to cut off a power supply network;
and the three-phase power supply is respectively connected with the zero-sequence current transformer, the controller and the tripper to provide voltage for the work of the zero-sequence current transformer, the controller and the tripper.
2. The three-phase four-wire leakage switch according to claim 1, further comprising an alarm, wherein the alarm is connected to a signal output end of the controller, and when the controller receives a mutual-inductance voltage signal output by the zero-sequence current transformer, the controller outputs a signal to the alarm, so that the alarm sends an alarm message.
3. A three-phase four-wire residual-current switch according to claim 1 or 2, further comprising a communication unit and a terminal, wherein the communication unit is connected with a signal output end of the controller for transmitting a result of whether the controller receives the output voltage signal of the zero sequence current transformer to the terminal.
4. A three-phase four-wire residual-current switch according to claim 3, wherein said communication unit is a GSM communication unit.
5. The three-phase four-wire bleeder switch of claim 1, wherein the controller is a catsc 54123A chip.
6. The three-phase four-wire residual-current switch according to claim 2, wherein the alarm is an audible and visual alarm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721675713.3U CN207572951U (en) | 2017-12-04 | 2017-12-04 | Three-phase and four-line leakage switch |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721675713.3U CN207572951U (en) | 2017-12-04 | 2017-12-04 | Three-phase and four-line leakage switch |
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| Publication Number | Publication Date |
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| CN207572951U true CN207572951U (en) | 2018-07-03 |
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| CN201721675713.3U Active CN207572951U (en) | 2017-12-04 | 2017-12-04 | Three-phase and four-line leakage switch |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112736846A (en) * | 2019-10-28 | 2021-04-30 | 株洲中车机电科技有限公司 | Integrated mutual inductor with leakage protection and zero sequence protection functions and application method |
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2017
- 2017-12-04 CN CN201721675713.3U patent/CN207572951U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112736846A (en) * | 2019-10-28 | 2021-04-30 | 株洲中车机电科技有限公司 | Integrated mutual inductor with leakage protection and zero sequence protection functions and application method |
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