CN220795410U - Fault detection circuit and fault detection system - Google Patents
Fault detection circuit and fault detection system Download PDFInfo
- Publication number
- CN220795410U CN220795410U CN202322046165.XU CN202322046165U CN220795410U CN 220795410 U CN220795410 U CN 220795410U CN 202322046165 U CN202322046165 U CN 202322046165U CN 220795410 U CN220795410 U CN 220795410U
- Authority
- CN
- China
- Prior art keywords
- contactor
- detection circuit
- fault detection
- tested
- switch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 121
- 238000010586 diagram Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 4
- 239000003086 colorant Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Landscapes
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The utility model discloses a fault detection circuit and a fault detection system, comprising a first detection circuit and a second detection circuit; the first detection circuit is used for being connected with the contactor to be detected in parallel and detecting whether a coil of the contactor to be detected is faulty or not; and the second detection circuit is used for being connected in series with the contactor to be detected and detecting whether the contact of the contactor to be detected fails. According to the technical scheme, whether the coil and the contact of the contactor to be tested are faulty or not is detected through the first detection circuit and the second detection circuit respectively, so that fault detection of the contactor to be tested is realized.
Description
Technical Field
The present utility model relates to the field of electronic circuits, and in particular, to a fault detection circuit and a fault detection system.
Background
The conventional contactor detection device can only be used for testing whether the response time of the contactor meets the standard, namely, when the contactor is damaged, whether the response time of the contactor is overtime can only be judged, but can not be judged whether the contactor is damaged, and the fault detection of the contactor can not be realized.
Disclosure of Invention
The embodiment of the utility model provides a fault detection circuit and a fault detection system, which are used for solving the problem that a contactor detection device cannot realize contactor fault detection.
A fault detection circuit includes a first detection circuit and a second detection circuit; the first detection circuit is used for being connected with a contactor to be detected in parallel and detecting whether a coil of the contactor to be detected is faulty or not;
the second detection circuit is used for being connected with the contactor to be detected in series and is used for detecting whether the contact of the contactor to be detected is faulty or not.
Further, the fault detection circuit further comprises a switch control module;
the switch control module is used for being connected with the power input end and the contactor to be tested and used for switching on or switching off the power input end and the contactor to be tested.
Further, the switch control module comprises an air switch;
the air switch is arranged between the power input end and the contactor to be tested in series; when the air switch is turned on, the fault detection circuit is in a fault detection state, and when the air switch is turned off, the fault detection circuit is in a non-fault detection state.
Further, the contactor to be tested comprises at least two contactors;
the switch control module comprises at least one selection circuit; an input of each of the selection circuits is coupled to the power supply input, and an output of each of the selection circuits is adapted to be connected to one of the two contactors.
Further, the selection circuit comprises a selection switch, wherein the selection switch comprises a first normally open contact and a second normally open contact;
the first normally open contact is connected with one of the two contactors in series; the second normally open contact is connected in series with the other of the two contactors.
Further, the contactor to be tested comprises at least one contactor; the switch control module comprises a first switch circuit; the first end of the first switch circuit is coupled to the power input end, and the second end of the first switch circuit is connected with at least one contactor and used for switching on or off the power input end and at least one contactor.
Further, the first detection circuit comprises a first indicator light; the second detection circuit comprises a second indicator lamp;
if the coil of the contactor to be tested does not have a fault, the first indicator lamp works normally, and if the coil of the contactor to be tested has a fault, the first indicator lamp does not work;
and if the contact of the contactor to be tested has no fault, the second indicator lamp works normally, and if the contact of the contactor to be tested has fault, the second indicator lamp does not work.
Further, the fault detection circuit further comprises an oscilloscope; the oscilloscope comprises a first channel and a second channel; the first channel is connected with the coil of the contactor to be tested; and the second channel is connected with the contact of the contactor to be detected and is used for detecting the response time of the contactor to be detected when the fault detection result is normal.
Further, the fault detection circuit further comprises a first switching power supply, and the first switching power supply is connected with the power input end and the switch control module and is used for receiving a first voltage signal input by the power input end and outputting a second voltage signal to the switch control module.
Further, the fault detection circuit includes a second switching power supply;
the switch control module is connected with the coil of the contactor to be tested in series;
the second switching power supply is connected in series with the power input end and the contact of the contactor to be tested and is used for receiving the first voltage signal input by the power input end and outputting a third voltage signal.
A fault detection system comprises a contactor to be detected and the fault detection circuit.
The fault detection circuit comprises a first detection circuit and a second detection circuit; the first detection circuit is connected in parallel with the contactor to be detected and is used for detecting whether the coil of the contactor to be detected fails or not; the second detection circuit is connected in series with the contactor to be detected and is used for detecting whether the contact of the contactor to be detected fails or not; therefore, whether the coil and the contact of the contactor to be tested are faulty or not is detected through the first detection circuit and the second detection circuit respectively, and fault detection of the contactor to be tested is achieved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments of the present utility model will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present 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 schematic diagram of a fault detection circuit according to an embodiment of the present utility model;
FIG. 2 is another schematic circuit diagram of a fault detection circuit according to an embodiment of the present utility model;
FIG. 3 is another schematic circuit diagram of a fault detection circuit according to an embodiment of the present utility model;
FIG. 4 is another schematic diagram of a fault detection circuit according to an embodiment of the present utility model;
FIG. 5 is another schematic circuit diagram of the fault detection circuit in an embodiment of the present utility model.
In the figure: 11. a switch control module; 111. at least one selection circuit; 112. a first switching circuit; 113. an air switch: 121. a first detection circuit; 122. a second detection circuit; 123. an oscilloscope; 20. a contactor to be tested; 21. at least two contactors; 30. a first switching power supply; 40. and a second switching power supply.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be understood that the present utility model may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art.
In the following description, for the purpose of providing a thorough understanding of the present utility model, detailed structures and steps are presented in order to illustrate the technical solution presented by the present utility model. Preferred embodiments of the present utility model are described in detail below, however, the present utility model may have other embodiments in addition to these detailed descriptions.
The present embodiment provides a fault detection circuit, which is applied to a fault detection system including a contactor 20 to be tested and the fault detection circuit. The fault detection circuit is connected to the contactor 20 to be tested and is used for detecting whether the contactor to be tested is faulty.
The present embodiment provides a fault detection circuit, as shown in fig. 1, including a first detection circuit 121 and a second detection circuit 122; a first detection circuit 121 connected in parallel with the contactor 20 to be tested, for detecting whether the coil of the contactor 20 to be tested is faulty; the second detection circuit 122 is connected in series with the contactor 20 to be tested, and is used for detecting whether the contact of the contactor 20 to be tested is faulty.
In the present embodiment, by connecting the first detection circuit 121 in parallel with the contactor 20 to be tested, it is detected whether the coil of the contactor 20 to be tested is faulty; the second detection circuit 122 is connected in series with the contactor 20 to be detected, and is used for detecting whether the contact of the contactor 20 to be detected is faulty, so as to respectively detect whether the coil and the contact of the contactor 20 to be detected are faulty, thereby realizing the fault detection of the contactor to be detected.
In one embodiment, as shown in fig. 3, the fault detection circuit further includes a switch control module 11. The switch control module 11 is used for being connected with the power input end and the contactor 20 to be tested, and is used for switching on or switching off the power input end and the contactor 20 to be tested.
In a specific embodiment, the switch control module 11 is configured to be connected to the power input terminal and the contactor 20 to be tested, and is configured to turn on or off the power input terminal and the contactor 20 to be tested. In this embodiment, the power input terminal is configured to receive a power supply signal. The switch control circuit comprises an on state and an off state, and is used for switching on or off the power input end and the contactor 20 to be tested. In this embodiment, when the switch control circuit is turned on, a power supply signal is input to the contactor 20 to be tested through the power input terminal to supply power to the contactor 20 to be tested, so as to perform fault detection on the contactor 20 to be tested. When the switch control circuit is turned off, the power supply signal cannot supply power to the contactor 20 to be tested, and the fault detection is stopped. The user can control the on/off of the switch control module 11 according to the actual requirement. Alternatively, the control may be performed by physical contact or by voice.
In one embodiment, as shown in FIG. 3, the switch control module 11 includes an air switch (C16-2P) 113; an air switch 113 disposed in series between the power input terminal and the contactor 20 to be tested; wherein, when the air switch 113 is turned on, the fault detection circuit is in a fault detection state, and when the air switch 113 is turned off, the fault detection circuit is in a non-fault detection state.
In one embodiment, the input of the air switch 113 is connected to the power input, and the output of the air switch 113 is connected to the contactor 20 to be tested. Illustratively, the positive input 23 of the air switch 113 is connected to the positive electrode 24+ of the power input, the negative input 13 of the air switch 113 is connected to the negative electrode 24-of the power input, and the positive output 24 of the air switch 113, the negative output 14 of the air switch 113, and the contactor 20 to be tested are connected in series.
In this embodiment, the switch control module 11 includes an air switch 113, where the air switch 113 is serially connected between the power input end and the contactor 20 to be tested, and when a user needs to perform fault detection on the contactor 20 to be tested, the air switch 113 is switched on by a physical contact manner, so that the fault detection circuit is in a fault detection state. When the user does not need to perform fault detection on the contactor 20 to be detected, the air switch 113 is switched off by means of physical contact, so that the fault detection circuit is in a non-fault detection state. By providing the air switch 113 in series between the power input terminal and the contactor 20 to be tested, it is possible to ensure that the contactor 20 to be tested is not burned out by a short circuit.
In one embodiment, as shown in fig. 3, the contactor 20 to be tested includes at least two contactors 21; the switch control module 11 includes at least one selection circuit 111; an input of each selection circuit is coupled to the power supply input, and an output of each selection circuit is adapted to be connected to one of the two contactors. In this embodiment, the input end of each selection circuit is coupled to the power input end, and the output end of each selection circuit is connected to one of the two contactors, so that the contactors can be selected to flexibly test whether faults exist in different contactors.
In a particular embodiment, the at least one selection circuit 111 includes a first selection circuit and a second selection circuit, and the at least two contactors 21 include a first contactor-KA 1, a second contactor-KA 2, a third contactor-KA 3, and a fourth contactor-KA 4. Illustratively, an input of the first selection circuit is coupled to the power supply input, and an output of the first selection circuit is switchably connected to one of the first contactor-KA 1 and the second contactor-KA 2. An input of the second selection circuit is coupled to the power input, and an output of the second selection circuit is connected to one of the third contactor-KA 3 and the fourth contactor-KA 4 by a switching manner. The first detection circuit 121 is connected in parallel with coils of the first contactor-KA 1, the second contactor-KA 2, the third contactor-KA 3 and the fourth contactor-KA 4, respectively, and the second detection circuit 122 is connected in series with contacts of the first contactor-KA 1, the second contactor-KA 2, the third contactor-KA 3 and the fourth contactor-KA 4, respectively. In the present embodiment, when the first selection circuit selectively connects the first contactor-KA 1 and the second selection circuit selectively connects the third contactor-KA 3, it is possible to perform fault detection on the first contactor-KA 1 and the third contactor-KA 3. When the first selection circuit is selectively connected with the second contactor-KA 2 and the second selection circuit is selectively connected with the fourth contactor-KA 4, the fault detection can be performed on the second contactor-KA 2 and the fourth contactor-KA 4.
In one embodiment, as shown in FIG. 3, the selection circuit includes a selection switch (-SA 1, -SA 2) that includes a first normally open contact and a second normally open contact; the first normally open contact is connected in series with one contactor of the two contactors; and the second normally open contact is connected in series with the other contactor of the two contactors.
The selection switch is a knob switch, and is preferably a three-gear two-normally-open self-locking switch.
In a specific embodiment, the selector switch includes a first normally open contact and a second normally open contact. The first normally open contact is connected in series with one contactor of the two contactors; and the second normally open contact is connected in series with the other contactor of the two contactors. In this embodiment, the contact connected to the circuit may be selected by selecting the closing and opening of the first normally open contact and the second normally open contact to perform fault detection on the contact.
In one embodiment, as shown in FIG. 4, the contactor 20 to be tested includes at least one contactor; the switch control module 11 includes a first switch circuit 112; a first terminal of the first switching circuit 112 is coupled to the power input terminal and a second terminal of the first switching circuit 112 is connected to the at least one contactor for switching on or off the power input terminal and the at least one contactor.
In one embodiment, the first switch circuit 112 is coupled to the power input via an air switch 113, and the second terminal of the first switch circuit 112 is connected to at least one contactor. When the air switch 113 is turned on and the first switch circuit 112 is turned on, a fault detection can be performed for at least one contactor. When the air switch 113 is turned off and the first switch circuit 112 is turned off, the fault detection of at least one contactor is stopped. Can be flexibly selected according to actual demands. Further, the first switch circuit 112 comprises a push button switch, a first end of which is coupled to the power input through an air switch 113, and a second end of which is connected to at least one contactor. The push button switch is a normally open push button switch-SB 1.
In the present embodiment, the contactor 20 to be tested includes at least one contactor; the switch control module 11 includes a first switch circuit 112; the first end of the first switch circuit 112 is coupled to the power input terminal, the second end of the first switch circuit 112 is connected to the at least one contactor for switching on or off the power input terminal and the at least one contactor, and the first switch circuit 112 can ensure that the contactor 20 to be tested is not burned out by a short circuit.
In one embodiment, as shown in FIG. 3, the first detection circuit 121 includes a first indicator lamp (e.g., -R1, -R2, -R3, and-R4 in FIG. 3); the second detection circuit 122 includes a second indicator light (e.g., -G1, -G2, -G3, and-G4 in FIG. 3); if the coil of the contactor 20 to be tested has no fault, the first indicator lamp works normally, and if the coil of the contactor 20 to be tested has fault, the first indicator lamp does not work; if the contact of the contactor 20 to be tested has no fault, the second indicator lamp works normally, and if the contact of the contactor 20 to be tested has fault, the second indicator lamp does not work.
The first indicator light and the second indicator light are two different indicator lights. Optionally, the first indicator light and the second indicator light are indicator lights with different colors. Illustratively, the first indicator light is a red light and the second indicator light is a green light. Alternatively, the contact may be a normally open contact or a normally closed contact. As shown in fig. 4, the coil of the contactor 20 to be tested is connected in parallel with the first indicator lamp-R1, the normally open contact of the contactor 20 to be tested is connected in series with the second indicator lamp-G1-1, and the normally open contact of the contactor 20 to be tested is connected in series with the second indicator lamp-G1-2.
In this embodiment, the first indicator light works normally, and the second indicator light works normally, so that the contactor 20 to be tested works normally. The first indicator lamp works normally, and the second indicator lamp does not work, so that the coil of the contactor 20 to be tested is normal, and the contact of the contactor 20 to be tested fails. The first indicator lamp does not work, and the second indicator lamp works normally, so that the coil of the contactor 20 to be tested fails, and the contact of the contactor 20 to be tested is normal. And if the first indicator lamp does not work and the second indicator lamp does not work, the coil of the contactor 20 to be tested fails, and the contact of the contactor 20 to be tested fails. Thereby intuitively judging whether the coil or the contact of the contactor 20 to be tested is faulty.
In one embodiment, as shown in fig. 3, the fault detection circuit further includes an oscilloscope 123; oscilloscope 123 includes a first channel and a second channel; a first channel connected to the coil of the contactor 20 to be tested; and a second channel connected to the contact of the contactor 20 to be tested, for detecting the response time of the contactor 20 to be tested when the fault detection result is normal.
In one embodiment, the specific method of detecting the response time of the contactor 20 to be tested using the oscilloscope 123 may employ a test method known to those skilled in the art. Illustratively, the power supply of the oscilloscope 123 is plugged in, self-calibration and setting are performed, and the oscilloscope 123 is adjusted to an automatic triggering sampling working mode; connecting the first channel of the oscilloscope 123 with the coil of the contactor 20 to be tested; connecting the second channel with the contact of the contactor 20 to be tested, closing the air switch 113, switching the selection circuit or conducting the first switch circuit 112, and observing a voltage waveform diagram in the oscilloscope 123; observing whether the first indicator lamp and the second indicator lamp work normally or not; when the first indicator lamp and the second indicator lamp are not working normally, the best making cursor in the oscilloscope 123 is adjusted, and X1 and X2 are adjusted to the voltage steady-state moment point, so that the response time of the contactor 20 to be measured is calculated automatically.
As shown in fig. 3, X and Y are respectively a coil input loop test terminal row of the contactor 20 to be tested and a contact output terminal test terminal row of the contactor 20 to be tested, X0 and Y0 are negative electrode measurement terminals of a first channel and a second channel of the oscilloscope 123, and a negative electrode output end of the air switch 113 is connected. X1 to X4 are measurement nodes of the positive measurement terminal of the first channel, and Y1 to Y4 are measurement nodes of the positive measurement terminal of the second channel.
In this embodiment, the first channel and the second channel are included by the oscilloscope 123; a first channel connected to the coil of the contactor 20 to be tested; and the second channel is connected with the contact of the contactor 20 to be tested and is used for detecting the response time of the contactor 20 to be tested when the fault detection result is normal, so that the response time of the contactor 20 to be tested can be detected while detecting whether the contactor 20 to be tested is faulty or not.
In an embodiment, as shown in fig. 3, the fault detection circuit further includes a first switching power supply 30, where the first switching power supply 30 is connected to the power input terminal and the switch control module 11, and is configured to receive a first voltage signal input by the power input terminal and output a second voltage signal to the switch control module 11.
The first voltage signal may be an ac voltage signal, i.e. the supply signal in the above-described embodiments, and the second voltage signal may be a dc voltage signal, for example. Alternatively, the ac voltage signal may be a three-phase ac voltage signal (L, N and PE) or a two-phase ac voltage signal.
In one embodiment, the first switching power supply 30 is an AC-DC switching power supply. The AC-DC switching power supply converts a first voltage signal to a second voltage signal.
In this embodiment, the first switching power supply 30 is connected to the power input terminal and the switch control module 11, and is configured to receive the first voltage signal input by the power input terminal, and output the second voltage signal to the switch control module 11, so that power can be supplied to the contactor 20 to be tested through the switch control module 11.
In one embodiment, as shown in fig. 5, the fault detection circuit includes a second switching power supply 40; the switch control module 11 is connected in series with the coil of the contactor 20 to be tested; the second switching power supply 40 is connected in series with the power input terminal and the contact of the contactor 20 to be tested, and is configured to receive the first voltage signal input by the power input terminal and output a third voltage signal.
In one embodiment, the second switching power supply 40 is an AC-DC switching power supply. The voltage values of the third voltage signal and the second voltage signal may be the same or different.
Preferably, the third voltage signal and the second voltage signal have different voltage values.
In the present embodiment, the switch control module 11 is connected in series with the coil of the contactor 20 to be tested; the second switching power supply 40 is connected in series with the power input end and the contact of the contactor 20 to be tested, and is used for receiving the first voltage signal input by the power input end and outputting the third voltage signal, so that the withstand voltage limit of the coil and the contact of the contactor 20 to be tested can be tested respectively.
The present embodiment provides a fault detection system including the contactor 20 to be tested and the fault detection circuit described above.
The above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model, and are intended to be included in the scope of the present utility model.
Claims (11)
1. A fault detection circuit comprising a first detection circuit and a second detection circuit; the first detection circuit is used for being connected with a contactor to be detected in parallel and detecting whether a coil of the contactor to be detected is faulty or not;
the second detection circuit is used for being connected with the contactor to be detected in series and is used for detecting whether the contact of the contactor to be detected is faulty or not.
2. The fault detection circuit of claim 1, wherein the fault detection circuit further comprises a switch control module;
the switch control module is used for being connected with the power input end and the contactor to be tested and used for switching on or switching off the power input end and the contactor to be tested.
3. The fault detection circuit of claim 2, wherein the switch control module comprises an air switch;
the air switch is arranged between the power input end and the contactor to be tested in series; when the air switch is turned on, the fault detection circuit is in a fault detection state, and when the air switch is turned off, the fault detection circuit is in a non-fault detection state.
4. The fault detection circuit of claim 2, wherein the contactor to be tested comprises at least two contactors;
the switch control module comprises at least one selection circuit; an input of each of the selection circuits is coupled to the power supply input, and an output of each of the selection circuits is adapted to be connected to one of the two contactors.
5. The fault detection circuit of claim 4, wherein the selection circuit comprises a selection switch comprising a first normally open contact and a second normally open contact;
the first normally open contact is connected with one of the two contactors in series; the second normally open contact is connected in series with the other of the two contactors.
6. The fault detection circuit of claim 2, wherein the contactor to be tested comprises at least one contactor; the switch control module comprises a first switch circuit; the first end of the first switch circuit is coupled to the power input end, and the second end of the first switch circuit is connected with at least one contactor and used for switching on or off the power input end and at least one contactor.
7. The fault detection circuit of claim 1, wherein the first detection circuit comprises a first indicator light; the second detection circuit comprises a second indicator lamp;
if the coil of the contactor to be tested does not have a fault, the first indicator lamp works normally, and if the coil of the contactor to be tested has a fault, the first indicator lamp does not work;
and if the contact of the contactor to be tested has no fault, the second indicator lamp works normally, and if the contact of the contactor to be tested has fault, the second indicator lamp does not work.
8. The fault detection circuit of any one of claims 1 to 7, wherein the fault detection circuit further comprises an oscilloscope; the oscilloscope comprises a first channel and a second channel; the first channel is connected with the coil of the contactor to be tested; and the second channel is connected with the contact of the contactor to be detected and is used for detecting the response time of the contactor to be detected when the fault detection result is normal.
9. The fault detection circuit of claim 2, further comprising a first switching power supply coupled to the power input and the switch control module for receiving the first voltage signal input from the power input and outputting a second voltage signal to the switch control module.
10. The fault detection circuit of claim 9, wherein the fault detection circuit comprises a second switching power supply;
the switch control module is connected with the coil of the contactor to be tested in series;
the second switching power supply is connected in series with the power input end and the contact of the contactor to be tested and is used for receiving the first voltage signal input by the power input end and outputting a third voltage signal.
11. A fault detection system comprising a contactor to be tested and a fault detection circuit as claimed in any one of claims 1 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322046165.XU CN220795410U (en) | 2023-07-31 | 2023-07-31 | Fault detection circuit and fault detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322046165.XU CN220795410U (en) | 2023-07-31 | 2023-07-31 | Fault detection circuit and fault detection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220795410U true CN220795410U (en) | 2024-04-16 |
Family
ID=90657386
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322046165.XU Active CN220795410U (en) | 2023-07-31 | 2023-07-31 | Fault detection circuit and fault detection system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220795410U (en) |
-
2023
- 2023-07-31 CN CN202322046165.XU patent/CN220795410U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20140229126A1 (en) | Fault detection method and device | |
| CN110673054B (en) | DC/DC power supply test system and aging test method of DC/DC power supply | |
| CN110031756B (en) | DC contactor performance test conversion circuit and service life test method | |
| CN113206660B (en) | Circuit channel switching circuit and method | |
| CN220795410U (en) | Fault detection circuit and fault detection system | |
| CN108226846B (en) | General polarity test circuit | |
| CN112986815B (en) | Circuit and method for testing anti-tripping loop of circuit breaker | |
| CN115993474A (en) | High-low voltage separation test circuit, wire tester and test method | |
| CN213933938U (en) | Well low-voltage plate cabinet secondary circuit test interface switching circuit | |
| CN112230106B (en) | Detection device and method for switch external local switching-on/off controller | |
| CN116106731B (en) | Relay testing device | |
| CN113900003A (en) | Chip pin disconnection detection device and detection method | |
| CN109375095B (en) | Signal machine monitoring system | |
| CN111812478A (en) | Device for selecting rectifier bridge diode during rectifier bridge detection and rectifier bridge detection system | |
| KR200240856Y1 (en) | Apparatus for judging faults of contact point in relay | |
| CN213210208U (en) | A wiring conversion equipment for circuit breaker characteristic test | |
| CN216771920U (en) | Pull electronic isolator divide-shut brake circuit detection device of power supply | |
| CN220961727U (en) | Working condition simulation test device based on electronic and electric products | |
| CN219695278U (en) | Detection device for auxiliary switch node and switch equipment | |
| CN213658939U (en) | Calibration equipment for automatic power supply switching device | |
| CN221326678U (en) | Multistage multichannel high-voltage automatic switching device and test system | |
| CN220289724U (en) | Voltage sensing equipment for detecting switching-on and switching-off performance of contact equipment | |
| CN214845642U (en) | Shutdown circuit breaker system and electrical test device applied to shutdown circuit breaker | |
| CN210720542U (en) | Improved universal meter | |
| CN220584322U (en) | Low-voltage contactor testing device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |