CN219245686U - Leakage test circuit - Google Patents
Leakage test circuit Download PDFInfo
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- CN219245686U CN219245686U CN202320008757.XU CN202320008757U CN219245686U CN 219245686 U CN219245686 U CN 219245686U CN 202320008757 U CN202320008757 U CN 202320008757U CN 219245686 U CN219245686 U CN 219245686U
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Abstract
The utility model relates to the technical field of low-voltage appliances, in particular to a leakage test circuit which comprises a test switch, a test resistor, a diode, a zero sequence transformer, a leakage protection device, a release and a circuit breaker, wherein the zero sequence transformer comprises a test winding and a leakage inductance winding; the alternating current loop passes through the zero sequence transformer, a leakage inductance winding of the zero sequence transformer is connected with the leakage protection device, the leakage protection device is connected with the alternating current loop, the leakage protection device is also connected with the release, and the release is connected with the circuit breaker; wherein the circuit breaker is arranged on the alternating current loop; the test switch and the diode isolate the interference of the alternating current loop to the zero sequence transformer, so that the anti-interference capability of the leakage test circuit is improved.
Description
Technical Field
The utility model relates to the technical field of piezoelectric devices, in particular to a leakage test circuit.
Background
With the development of technology, the circuit breaker with residual current protection is increasingly widely applied in the field of piezoelectric devices, not only voltage distribution systems, but also industrial and charging systems. As the application of the circuit breaker is more and more widespread, the technical requirement for residual current protection is also more and more high, and the circuit breaker can malfunction if the anti-interference circuit is not properly processed. The leakage test circuit is used as a part of the protection circuit with the residual current protection circuit breaker, and a proper leakage test circuit plays a vital role in the anti-interference capability of the protection circuit breaker with the residual current protection circuit breaker, so that the misoperation of the protection circuit breaker with the residual current protection circuit breaker can be effectively prevented.
Disclosure of Invention
Therefore, the present utility model is directed to a leakage test circuit to overcome the problem of poor anti-interference capability of the current leakage test circuit.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the leakage test circuit comprises a test switch, a test resistor, a diode, a zero sequence transformer, a leakage protection device, a release and a circuit breaker;
the zero sequence transformer comprises a test winding and a leakage inductance winding;
one end of the test switch is connected to one branch of the alternating current loop, the other end of the test switch is connected with the test resistor, the test resistor is connected with one end of the test winding, the other end of the test winding is connected with the anode of the diode, and the cathode of the diode is connected to the other branches of the alternating current loop; wherein the alternating current loop passes through the zero sequence transformer;
the leakage inductance winding of the zero sequence transformer is connected with the leakage protection device, the leakage protection device is connected with the alternating current loop, the leakage protection device is also connected with the release, and the release is connected with the circuit breaker; wherein the circuit breaker is disposed on the ac circuit.
Further, in the circuit described above, the test resistor includes: resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, resistor R7, and resistor R8;
the resistor R1 and the resistor R2 are connected in parallel to form a first resistor group, the resistor R3 and the resistor R4 are connected in parallel to form a second resistor group, the resistor R5 and the resistor R6 are connected in parallel to form a third resistor group, and the resistor R7 and the resistor R8 are connected in parallel to form a fourth resistor group;
the first resistor group is connected in series with the second resistor group, the third resistor group and the fourth resistor group in sequence.
Further, in the above circuit, the test switch includes: toggle switch, push button switch and push button switch.
Further, in the above circuit, the leakage protection device includes: and a controller.
The beneficial effects of the utility model are as follows:
the zero sequence transformer comprises a test winding and a leakage inductance winding, wherein one end of the test switch is connected to one branch of an alternating current loop, the other end of the test switch is connected with the test resistor, the test resistor is connected with one end of the test winding, the other end of the test winding is connected with an anode of the diode, and a cathode of the diode is connected to other branches of the alternating current loop; the alternating current loop passes through the zero sequence transformer, a leakage inductance winding of the zero sequence transformer is connected with the leakage protection device, the leakage protection device is connected with the alternating current loop, the leakage protection device is also connected with the release, and the release is connected with the circuit breaker; wherein the circuit breaker is arranged on the ac loop. In this application, test switch and the isolated alternating current return circuit of diode are to zero sequence transformer's interference, have promoted the interference killing feature of electric leakage test circuit, prevent that electric leakage circuit breaker from producing the false tripping operation because of test circuit receives the interference.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of an embodiment of a leakage test circuit according to the present utility model.
Detailed Description
In order to make the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions of the present utility model will be described in detail below. It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. All other embodiments, based on the examples herein, which are within the scope of the utility model as defined by the claims, will be within the scope of the utility model as defined by the claims.
With the development of technology, the circuit breaker with residual current protection is increasingly widely applied in the field of piezoelectric devices, not only voltage distribution systems, but also industrial and charging systems. Along with the wider and wider application, the technical requirements on residual current protection are higher and higher, and particularly, the requirements on the anti-interference capability of the circuit breaker with the residual current protection are higher and higher on occasions with large harmonic interference such as charging piles, industry and the like, and the misoperation of the circuit breaker can be caused if the anti-interference circuit is not properly processed. The leakage test circuit is used as a part of the protection circuit with the residual current protection circuit breaker, and a proper leakage test circuit plays a vital role in the anti-interference capability of the protection circuit breaker with the residual current protection circuit breaker, so that the misoperation of the protection circuit breaker with the residual current protection circuit breaker can be effectively prevented.
Therefore, the present utility model is directed to a leakage test circuit to overcome the problem of poor anti-interference capability of the current leakage test circuit.
As shown in fig. 1, fig. 1 is a block diagram of an embodiment of a leakage test circuit according to the present utility model, where the embodiment includes:
the device comprises a test switch 8, a test resistor 4, a diode 9, a zero sequence transformer 2, a leakage protection device 5, a release 3 and a circuit breaker 1;
the zero sequence transformer 2 comprises a test winding 6 and a leakage inductance winding 7;
one end of the test switch 8 is connected to one branch of the alternating current loop, the other end of the test switch is connected with the test resistor 4, the test resistor 4 is connected with one end of the test winding 6, the other end of the test winding 6 is connected with the anode of the diode 9, and the cathode of the diode 9 is connected to the other branches of the alternating current loop; wherein the alternating current loop passes through the zero sequence transformer 2;
the leakage inductance winding 7 of the zero sequence transformer 2 is connected with the leakage protection device 5, the leakage protection device 5 is connected with an alternating current loop, the leakage protection device 5 is also connected with the release 3, and the release 3 is connected with the circuit breaker 1; wherein the circuit breaker 1 is arranged on the ac circuit.
It can be understood that the embodiment is provided with a test switch 8, a test resistor 4, a diode 9, a zero sequence transformer 2, a leakage protection device 5, a release 3 and a circuit breaker 1, wherein the zero sequence transformer 2 comprises a test winding 6 and a leakage inductance winding 7, one end of the test switch 8 is connected to one branch of an alternating current loop, the other end of the test switch is connected with the test resistor 4, the test resistor 4 is connected with one end of the test winding 6, the other end of the test winding is connected with an anode of the diode 9, and a cathode of the diode 9 is connected to other branches of the alternating current loop; the alternating current loop passes through the zero sequence transformer 2, a leakage inductance winding 7 of the zero sequence transformer 2 is connected with the leakage protection device 5, the leakage protection device 5 is connected with the alternating current loop, the leakage protection device 5 is also connected with the release 3, and the release 3 is connected with the circuit breaker 1; wherein the circuit breaker 1 is arranged on the ac circuit. In the embodiment, the test switch 4 and the diode 9 isolate the interference of the alternating current loop to the zero-sequence transformer, so that the anti-interference capability of the leakage test circuit is improved, and the leakage circuit breaker is prevented from generating false tripping caused by the interference of the test circuit.
The reverse non-conductive nature of the diode 9 suppresses the effect of the ac circuit to which it is connected on the zero sequence transformer 2.
It should be noted that, the connection of the test switch 8 with one main line in the ac loop may disconnect the influence of the loop connected with the test switch 8 on the zero sequence transformer 2, and the connection of the cathode of the diode 9 with the other loop in the ac loop may suppress the influence of the ac loop connected with the test switch 9 on the zero sequence transformer 2 by using the characteristic that the diode 9 is non-conductive in the reverse direction. In this embodiment, when the test switch 8 is pressed, a half-wave analog leakage current is generated, and the zero sequence transformer 2 controls the breaker to open through the leakage protection circuit after sensing the analog leakage current.
Preferably, the test resistor 4 includes: resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, resistor R7, and resistor R8;
the resistor R1 and the resistor R2 are connected in parallel to form a first resistor group, the resistor R3 and the resistor R4 are connected in parallel to form a second resistor group, the resistor R5 and the resistor R6 are connected in parallel to form a third resistor group, and the resistor R7 and the resistor R8 are connected in parallel to form a fourth resistor group;
the first resistor group is sequentially connected with the second resistor group, the third resistor group and the fourth resistor group in series.
It can be understood that the power shared by each resistor is lower by connecting the resistors in series and then in parallel, so that the temperature of the resistor is lower, and the normal operation of the resistor is ensured.
It is understood that the test resistor 4 includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, and a resistor R8, but the same test resistance effect can be achieved by changing the resistance value or the number of the resistors.
Preferably, the test switch 8 includes: toggle switch, push button switch and push button switch.
Preferably, the earth leakage protection device 5 includes: and a controller.
It can be understood that the controller judges whether the ac circuit is in leakage or not according to the magnitude of the induced current obtained through the leakage induction winding 7, and when detecting that the induced current reaches the preset current magnitude, the controller controls the breaker 1 to perform emergency breaking on the ac circuit through the trip unit 3. When the circuit breaker 1 is in a closing state, the leakage protection device 5 takes electricity from a A, B, C three-phase loop, leakage current in the main loop is monitored through a leakage inductance winding 7 of the zero sequence transformer 2, and when a test switch 8 is closed, current flows through a test resistor 4 and a diode 9, so that a simulated leakage current is generated, and after the leakage protection device 5 senses the leakage current, the circuit breaker 1 is controlled to trip through a release 3; if the main loop voltage is isolated by the diode 9 and the test switch 8, when the main loop has an interference signal, the test winding 6 of the zero sequence transformer 2 can introduce the interference signal from the phase line of the main loop, and the interference signal can enable the leakage protection device to trigger the release 3 to control the circuit breaker 1 to trip.
It is to be understood that the same or similar parts in the above embodiments may be referred to each other, and that in some embodiments, the same or similar parts in other embodiments may be referred to.
It should be noted that in the description of the present utility model, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, in the description of the present utility model, unless otherwise indicated, the meaning of "plurality" means at least two.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.
Claims (4)
1. The leakage test circuit is characterized by comprising a test switch, a test resistor, a diode, a zero sequence transformer, a leakage protection device, a release and a circuit breaker;
the zero sequence transformer comprises a test winding and a leakage inductance winding;
one end of the test switch is connected to one branch of the alternating current loop, the other end of the test switch is connected with the test resistor, the test resistor is connected with one end of the test winding, the other end of the test winding is connected with the anode of the diode, and the cathode of the diode is connected to the other branches of the alternating current loop; wherein the alternating current loop passes through the zero sequence transformer;
the leakage inductance winding of the zero sequence transformer is connected with the leakage protection device, the leakage protection device is connected with the alternating current loop, the leakage protection device is also connected with the release, and the release is connected with the circuit breaker; wherein the circuit breaker is disposed on the ac circuit.
2. The circuit of claim 1, wherein the test resistor comprises: resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, resistor R7, and resistor R8;
the resistor R1 and the resistor R2 are connected in parallel to form a first resistor group, the resistor R3 and the resistor R4 are connected in parallel to form a second resistor group, the resistor R5 and the resistor R6 are connected in parallel to form a third resistor group, and the resistor R7 and the resistor R8 are connected in parallel to form a fourth resistor group;
the first resistor group is connected in series with the second resistor group, the third resistor group and the fourth resistor group in sequence.
3. The circuit of claim 1, wherein the test switch comprises: toggle switch, push button switch and push button switch.
4. The circuit of claim 2, wherein the leakage protection device comprises: and a controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320008757.XU CN219245686U (en) | 2023-01-03 | 2023-01-03 | Leakage test circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320008757.XU CN219245686U (en) | 2023-01-03 | 2023-01-03 | Leakage test circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219245686U true CN219245686U (en) | 2023-06-23 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320008757.XU Active CN219245686U (en) | 2023-01-03 | 2023-01-03 | Leakage test circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219245686U (en) |
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2023
- 2023-01-03 CN CN202320008757.XU patent/CN219245686U/en active Active
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