CN215833542U - Insulation detection device and system - Google Patents
Insulation detection device and system Download PDFInfo
- Publication number
- CN215833542U CN215833542U CN202121803208.9U CN202121803208U CN215833542U CN 215833542 U CN215833542 U CN 215833542U CN 202121803208 U CN202121803208 U CN 202121803208U CN 215833542 U CN215833542 U CN 215833542U
- Authority
- CN
- China
- Prior art keywords
- equivalent
- unit
- insulation
- module
- judging
- 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
Images
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The utility model discloses an insulation detection device and system, wherein an input unit receives a control signal and then sends the control signal to an equivalent unit, the control signal comprises a self-checking signal and an insulation detection signal, the equivalent unit conducts equivalent conduction, wherein the equivalent conduction is to conduct a corresponding equivalent resistor and output a feedback signal to a judgment unit, the judgment unit carries out comparison judgment according to the feedback signal of the equivalent unit to determine whether current detection is normal or not, and a display unit displays the current detection state according to the detection result of the judgment unit; the equivalent unit judges whether the difference between the equivalent resistance and the target to be tested accords with a preset standard or not through judging the difference between the equivalent resistance and the target to be tested and then judging whether the difference between the equivalent resistance and the target to be tested accords with the preset standard or not through the judging module, so that whether the insulation degree of the target to be tested withstands a preset condition or not is judged, and the effect of judging the insulation degree of the target to be tested is achieved through setting the preset condition.
Description
Technical Field
The utility model belongs to the technical field of testing, and particularly relates to an insulation detection device and system.
Background
At present, electricity is an essential element in life. In some occasions where there is no power supply or the power supply is required to be not interrupted, some devices are inevitably used to convert other energy sources into alternating current to supply power to electric equipment, such as an uninterruptible power supply vehicle-mounted inverter. In order to avoid electric shock accidents caused by insulation failure when the equipment is used, the insulation performance of each equipment needs to be detected, and corresponding processing means needs to be made in time when insulation failure is found;
the insulation detection means in the prior art usually judges whether a certain voltage is input, and then collects whether conduction current exists or not, so as to realize the effect of insulation detection.
SUMMERY OF THE UTILITY MODEL
In order to overcome the above disadvantages of the prior art, the present invention provides an insulation detection device, which aims to solve the technical problem that the insulation degree of the test object is difficult to judge in the conventional test device.
In order to achieve the purpose, the technical scheme adopted by the utility model is as follows:
an insulation detection device comprising:
an input unit for inputting a control signal;
the equivalent unit is used for carrying out equivalent conduction;
the judging unit is used for judging whether the current detection is normal or not;
the display unit is used for displaying the current detection state;
the output end of the input unit is connected with the first end of the equivalent unit, the second end of the equivalent unit is connected with the input end of the judging unit, the third end of the equivalent unit is connected with an external insulation resistor, and the output end of the judging unit is connected with the input end of the display unit.
Further, the input unit comprises a square wave generating module and a frequency dividing module, wherein the square wave generating module is used for outputting square wave signals, and the frequency dividing module is used for processing the square wave signals output by the square wave generating module; the output end of the square wave generation module is connected with the input end of the frequency division module, and the output end of the frequency division module is connected with the first end of the equivalent unit.
Further, the equivalent unit comprises an analog switch, an equivalent module and a relay;
the analog switch is used for switching and conducting the equivalent module; the relay is used for connecting an external insulation resistor; the equivalent module is used for determining the equivalent resistance of the external insulation resistance;
the first end of the module switch is connected with the input unit, the second end of the analog switch is connected with the equivalent module, the third end of the analog switch is connected with the first end of the relay, the second end of the relay is connected with the external insulation resistor, and the third end of the relay is connected with the input end of the judging unit.
Further, the judging unit comprises a comparing module and a triggering module; the comparison module is used for judging high and low levels, and the trigger module is used for generating a judging signal;
the input end of the comparison module is connected with the input end of the equivalent unit, the output end of the comparison module is connected with the input end of the trigger module, and the output end of the trigger module is connected with the input end of the display unit.
Furthermore, the display unit comprises a self-checking display module and an insulating display module;
the self-checking display module is used for displaying whether the self-checking state is normal or not, and the insulation display module is used for displaying whether the insulation state is normal or not;
the input ends of the self-checking display module and the insulation display module are connected with the output end of the judging unit.
Further, the equivalent module includes a first equivalent resistor and a second equivalent resistor, one end of the first equivalent resistor is connected to the analog switch, the other end of the first equivalent resistor is grounded, one end of the second equivalent resistor is connected to the analog switch, and the other end of the second equivalent resistor is grounded.
Further, the display unit comprises an insulation resistance judgment circuit and a fault self-checking judgment circuit; the input ends of the insulation resistance judging circuit and the fault self-checking judging circuit are connected with the output end of the judging unit, and the insulation resistance judging circuit and the fault self-checking judging circuit carry out corresponding indicator light prompting according to the output signal of the judging unit.
Furthermore, the device also comprises a control circuit, wherein the input end of the control circuit is used for receiving a self-checking control signal and an insulation monitoring control signal, and the output end of the control circuit is connected with the equivalent unit.
The operation mainboard comprises a plurality of input switches, and the input units of one group and the plurality of groups are connected in a one-to-one correspondence manner.
Correspondingly, the utility model also provides an insulation detection system which comprises the insulation detection device.
Compared with the prior art, the utility model has the beneficial effects that:
the insulation detection device provided by the utility model receives a control signal through an input unit and then sends the control signal to an equivalent unit, the equivalent unit conducts equivalent conduction, wherein the equivalent conduction is to conduct a corresponding equivalent resistor and output a feedback signal to a judgment unit, the judgment unit carries out comparison judgment according to the feedback signal of the equivalent unit to determine whether current detection is normal, and a display unit displays the current detection state according to the detection result of the judgment unit; the equivalent unit judges whether the difference between the equivalent resistance and the target to be tested accords with a preset standard or not through judging the difference between the equivalent resistance and the target to be tested and then judging whether the difference between the equivalent resistance and the target to be tested accords with the preset standard or not through the judging module, so that whether the insulation degree of the target to be tested withstands a preset condition or not is judged, and the effect of judging the insulation degree of the target to be tested is achieved through setting the preset condition.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an insulation detecting apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an insulation detecting apparatus according to another embodiment of the present invention.
Description of reference numerals:
1. an input unit; 2. an equivalent unit; 21. an analog switch; 22. an equivalent module; 23. a relay; 3. a judgment unit; 31. a comparison module; 32. a triggering module; 4. a display unit; 41. a self-checking display module; 42. an insulating display module; 5. a control circuit.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, an embodiment of the present invention provides an insulation detecting apparatus, including:
an input unit for inputting a control signal;
the equivalent unit is used for carrying out equivalent conduction;
the judging unit is used for judging whether the current detection is normal or not;
the display unit is used for displaying the current detection state;
the output end of the input unit is connected with the first end of the equivalent unit, the second end of the equivalent unit is connected with the input end of the judging unit, the third end of the equivalent unit is connected with an external insulation resistor, and the output end of the judging unit is connected with the input end of the display unit.
Specifically, in an insulation detection means in the prior art, usually, a certain voltage is input, and then whether a conduction current exists is acquired, so that an insulation detection effect is realized, although the method can achieve the insulation detection effect, the input voltage is received, the conduction current belongs to insulation, and the like, and the standard of the conduction current is difficult to measure, so that the problem that the insulation degree of a test target is difficult to judge exists; in the embodiment, through the addition of the equivalent unit, the equivalent comparison of the resistance value of the external insulation through the equivalent unit is realized, and when the resistance value exceeds the preset resistance value, the insulation can be considered, so that the insulation degree of the test target can be estimated to a certain degree through the equivalent unit; more specifically, in the present embodiment, the input unit receives the control signal and then sends the control signal to the equivalent unit, the control signal includes a self-test signal and an insulation detection signal, the equivalent unit performs equivalent conduction, where the equivalent conduction is to conduct a corresponding equivalent resistor, and output a feedback signal to the determination unit, the determination unit performs comparison and determination according to the feedback signal of the equivalent unit to determine whether current detection is normal, and the display unit displays a current detection state according to a detection result of the determination unit; the equivalent unit judges whether the difference between the equivalent resistance and the target to be tested accords with a preset standard or not through judging the difference between the equivalent resistance and the target to be tested and then judging whether the difference between the equivalent resistance and the target to be tested accords with the preset standard or not through the judging module, so that whether the insulation degree of the target to be tested withstands a preset condition or not is judged, and the effect of judging the insulation degree of the target to be tested is achieved through setting the preset condition.
Further, the input unit comprises a square wave generating module and a frequency dividing module, wherein the square wave generating module is used for outputting square wave signals, and the frequency dividing module is used for processing the square wave signals output by the square wave generating module; the output end of the square wave generation module is connected with the input end of the frequency division module, and the output end of the frequency division module is connected with the first end of the equivalent unit.
Specifically, in this embodiment, the square wave generating module includes a square wave oscillator, the frequency dividing module includes a frequency dividing port, the square wave oscillator generates a square wave signal, the square wave signal is selected through the frequency dividing port, and finally a 2Hz square wave signal is output, that is, a square wave signal with 2 cycles per second is generated and output to the equivalent unit.
Further, the equivalent unit comprises an analog switch, an equivalent module and a relay;
the analog switch is used for switching and conducting the equivalent module; the relay is used for connecting an external insulation resistor; the equivalent module is used for determining the equivalent resistance of the external insulation resistance;
the first end of the module switch is connected with the input unit, the second end of the analog switch is connected with the equivalent module, the third end of the analog switch is connected with the first end of the relay, the second end of the relay is connected with the external insulation resistor, and the third end of the relay is connected with the input end of the judging unit.
Further, the equivalent module includes a first equivalent resistor and a second equivalent resistor, one end of the first equivalent resistor is connected to the analog switch, the other end of the first equivalent resistor is grounded, one end of the second equivalent resistor is connected to the analog switch, and the other end of the second equivalent resistor is grounded.
Specifically, the analog switch in this embodiment may be a device capable of implementing an analog switch function, such as an MOS transistor; the analog switch is respectively connected with a first equivalent resistor and a second equivalent resistor in the equivalent module through a square wave signal according to the input unit, wherein the analog switch is also connected with the relay, and the relay is externally provided with an insulation resistor; the relay is used for conducting a self-checking test through the relay conducting analog switch, the relay is used for conducting an external insulation resistance to conduct an insulation test, the first equivalent resistance and the second equivalent resistance are within a preset insulation value, and the second equivalent resistance is outside the preset insulation value, so that the judging unit is required to output a non-alarm signal when the first equivalent resistance is conducted, the judging unit is required to output an alarm signal when the second equivalent resistance is conducted, and the self-checking is calculated only when the process is met; therefore, whether the current resistance value meets the preset resistance value is judged through the judging unit, therefore, when insulation detection is carried out, the relay conducts the external insulation resistor, whether the current resistance value meets the preset resistance value is judged through the judging module, if the current resistance value meets the preset resistance value, insulation detection is carried out, and the resistance value range of the external insulation resistor can be estimated approximately at the moment.
Further, the judging unit comprises a comparing module and a triggering module; the comparison module is used for judging high and low levels, and the trigger module is used for generating a judging signal;
the input end of the comparison module is connected with the input end of the equivalent unit, the output end of the comparison module is connected with the input end of the trigger module, and the output end of the trigger module is connected with the input end of the display unit.
Specifically, in this embodiment, the comparison module includes an analog comparator and a reference potential, and the trigger module includes a trigger; the reference potential is used for providing a preset voltage to the analog comparator, the comparator is used for receiving a voltage signal of the equivalent unit, comparing and judging the voltage signal of the equivalent unit with the preset voltage provided by the reference potential, judging whether the preset voltage is met or not, if the preset voltage is met, outputting a high level to the trigger, the trigger outputs a display square wave to the display circuit according to the high level of the analog comparator, and the display circuit correspondingly displays according to the display square wave; the resistance value of the preset voltage can be determined through the setting of the preset voltage, and when the external insulation resistor is connected, if the preset voltage can be met, the external insulation resistor is larger than the preset resistance value, so that the external insulation resistor can be evaluated within a resistance range.
Furthermore, the display unit comprises a self-checking display module and an insulating display module;
the self-checking display module is used for displaying whether the self-checking state is normal or not, and the insulation display module is used for displaying whether the insulation state is normal or not;
the input ends of the self-checking display module and the insulation display module are connected with the output end of the judging unit.
Further, the display unit comprises an insulation resistance judgment circuit and a fault self-checking judgment circuit; the input ends of the insulation resistance judging circuit and the fault self-checking judging circuit are connected with the output end of the judging unit, and the insulation resistance judging circuit and the fault self-checking judging circuit carry out corresponding indicator light prompting according to the output signal of the judging unit.
Specifically, the self-checking display module comprises a fault self-checking judgment circuit, the fault self-checking judgment circuit comprises a fault red light and a normal green light, the fault self-checking judgment circuit controls the fault red light to be on when the self-checking fails, and the fault self-checking judgment circuit controls the normal green light to be on when the self-checking passes; the insulation display module comprises an insulation resistance judgment circuit, the insulation resistance judgment circuit comprises a fault red light and a normal green light, the fault self-detection judgment circuit controls the fault red light to be on when the self-detection is not passed, and the fault self-detection judgment circuit controls the normal green light to be on when the self-detection is passed.
Furthermore, the device also comprises a control circuit, wherein the input end of the control circuit is used for receiving a self-checking control signal and an insulation monitoring control signal, and the output end of the control circuit is connected with the equivalent unit.
Specifically, the process of realizing self-checking and external insulation detection is as follows:
when the self-checking is carried out, the input unit inputs a square wave signal, the control circuit sends out a self-checking control signal to control the analog switch to respectively conduct the first equivalent resistor and the second equivalent resistor so as to output a V0 signal, and the V0 signal is transmitted to the judgment module through the relay; in this embodiment, the first equivalent resistor has a resistance value of 300K, the second equivalent resistor has a resistance value of 200K, and the preset resistance value of 300K can only pass insulation detection, so that during self-test, the first equivalent resistor is firstly turned on, a voltage V0 signal corresponding to the 300K resistance value is output, the judgment module receives a judgment V0 signal and then outputs a non-alarm signal to the self-test display module of the display unit, the fault self-test judgment circuit controls the normal green light to light, then the second equivalent resistor is turned on, a voltage V0 signal corresponding to the 200K resistance value is output, the judgment module receives a judgment V0 signal and then outputs an alarm signal to the self-test display module of the display unit, the fault self-test judgment circuit controls the fault red light to light, and only when the above conditions are met, all parts of the circuit can be proved to operate normally, and the self-test is completed;
when external insulation detection is carried out, a square wave signal is input into the input unit, the control circuit sends a self-checking control signal to control the relay to conduct an external insulation resistor, test voltage is output to the judging unit, the judging unit judges whether the test voltage meets preset voltage, if yes, insulation passing information is output to an insulation resistance judging circuit of the display module, the insulation resistance judging circuit controls a normal green light to light up, if not, insulation failing information is output to an insulation resistance judging circuit of the display module, the insulation resistance judging circuit controls a fault red light to light up, and fault test is completed;
referring to fig. 2, the display device further includes an operation main board, wherein the plurality of groups of input units, the equivalent unit, the judgment unit and the display unit are all connected to the operation main board, the operation main board further includes a plurality of input switches, and one of each input switch and the plurality of groups of input units are connected in a one-to-one correspondence manner.
Specifically, in this embodiment, the mainboard includes the socket, input unit, equivalent unit, judgement unit and display element all with the socket of operation mainboard is connected, and a set of input unit, equivalent unit, judgement unit and display element are a detection circuitry, are equipped with four group's detection circuitry in this embodiment, including two sets of self-checking circuit and two sets of insulation detection circuitry, and input unit still includes the switch, and the detection circuitry through which way of closed disconnection control of switch moves, and concrete use is as follows:
the first step is to check whether the internal circuit of the MKN1 device is normal, and then the device is self-checked. At this time, the 1 st way self-test switch is turned on. At this time, the MKN1 device starts to work by self-checking. If the self-checking indicator lamp of the self-made testing device emits 1 second of 2Hz flicker, the MKN1 device 1 st path testing insulation circuit works normally. If the self-checking indicator light is not on, but the self-checking fault light is on, the 1 st circuit is in fault. And at the moment, switching to the 2 nd path, switching off the 1 st path self-checking switch, switching on the 2 nd path self-checking switch, and if the self-checking indicator lamp of the self-made testing device flickers for 1 second at 2Hz, indicating that the 2 nd path of the MKN1 device works normally. Otherwise, the self-checking fault lamp is on, which indicates that the 2 nd circuit is faulty.
After the internal circuit of the MKN1 device is checked as described above, the self-test switch is turned off. And step 2, using a self-made analog resistor inside the device to achieve equivalent external insulation resistance, and checking whether the MKN1 device works normally for measuring the insulation resistance of the external device. At this time, the 1 st insulation inspection switch is turned on, and the toggle switch 1 is set to 300K. The alarm value of the MKN1 device is less than or equal to 0.2M omega, namely 200K, so that the condition that the peripheral insulation is normal is shown. At the moment, the insulation normal indicator light of the self-control device is on, then the button switch 1 is set to 200K, at the moment, the insulation normal indicator light of the self-control device is off, and the insulation fault light (red) is on. If all the above are normal, the 1 st insulation check switch is opened.
And 3, switching on the 2 nd path insulation switch by using the same method, and setting the button switch 2 for 300K, wherein the insulation normal indicator lamp of the self-control device is turned off, and the insulation fault lamp (red) is turned on. The MKN1 device 2 nd path measurement insulation circuit is also explained to work normally.
Correspondingly, the utility model also provides an insulation detection system which comprises the insulation detection device.
It should be noted that other contents of the insulation detecting device disclosed in the present invention can be referred to in the prior art, and are not described herein again.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the motion situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, it should be noted that the descriptions related to "first", "second", etc. in the present invention are only used for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. An insulation detection device, comprising:
an input unit for inputting a control signal;
the equivalent unit is used for carrying out equivalent conduction;
the judging unit is used for judging whether the current detection is normal or not;
the display unit is used for displaying the current detection state;
the output end of the input unit is connected with the first end of the equivalent unit, the second end of the equivalent unit is connected with the input end of the judging unit, the third end of the equivalent unit is connected with an external insulation resistor, and the output end of the judging unit is connected with the input end of the display unit.
2. The insulation detecting device according to claim 1, wherein the input unit comprises a square wave generating module and a frequency dividing module, the square wave generating module is configured to output a square wave signal, and the frequency dividing module is configured to process the square wave signal output by the square wave generating module; the output end of the square wave generation module is connected with the input end of the frequency division module, and the output end of the frequency division module is connected with the first end of the equivalent unit.
3. The insulation detection device according to claim 1, wherein the equivalent unit includes an analog switch, an equivalent module, and a relay;
the analog switch is used for switching and conducting the equivalent module; the relay is used for connecting an external insulation resistor; the equivalent module is used for determining the equivalent resistance of the external insulation resistance;
the first end of the module switch is connected with the input unit, the second end of the analog switch is connected with the equivalent module, the third end of the analog switch is connected with the first end of the relay, the second end of the relay is connected with the external insulation resistor, and the third end of the relay is connected with the input end of the judging unit.
4. The insulation detection device according to claim 1, wherein the determination unit comprises a comparison module and a trigger module; the comparison module is used for judging high and low levels, and the trigger module is used for generating a judging signal;
the input end of the comparison module is connected with the input end of the equivalent unit, the output end of the comparison module is connected with the input end of the trigger module, and the output end of the trigger module is connected with the input end of the display unit.
5. The insulation detection device according to claim 1, wherein the display unit comprises a self-test display module and an insulation display module;
the self-checking display module is used for displaying whether the self-checking state is normal or not, and the insulation display module is used for displaying whether the insulation state is normal or not;
the input ends of the self-checking display module and the insulation display module are connected with the output end of the judging unit.
6. The insulation detection device according to claim 3, wherein the equivalent module comprises a first equivalent resistor and a second equivalent resistor, one end of the first equivalent resistor is connected to the analog switch, the other end of the first equivalent resistor is grounded, one end of the second equivalent resistor is connected to the analog switch, and the other end of the second equivalent resistor is grounded.
7. The insulation detecting device according to claim 1, wherein the display unit includes an insulation resistance judging circuit and a failure self-checking judging circuit; the input ends of the insulation resistance judging circuit and the fault self-checking judging circuit are connected with the output end of the judging unit, and the insulation resistance judging circuit and the fault self-checking judging circuit carry out corresponding indicator light prompting according to the output signal of the judging unit.
8. The insulation detection device according to claim 7, further comprising a control circuit, wherein an input end of the control circuit is used for receiving a self-test control signal and an insulation monitoring control signal, and an output end of the control circuit is connected with the equivalent unit.
9. The insulation detecting device according to claim 1, further comprising an operation main board, wherein a plurality of groups of the input units, the equivalent units, the judging units, and the display units are all connected to the operation main board, the operation main board further comprises a plurality of input switches, and one of the plurality of groups of the input units of each input switch are connected in a one-to-one correspondence manner.
10. An insulation detection system, characterized in that it comprises an insulation detection device according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121803208.9U CN215833542U (en) | 2021-08-04 | 2021-08-04 | Insulation detection device and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121803208.9U CN215833542U (en) | 2021-08-04 | 2021-08-04 | Insulation detection device and system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215833542U true CN215833542U (en) | 2022-02-15 |
Family
ID=80193721
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121803208.9U Active CN215833542U (en) | 2021-08-04 | 2021-08-04 | Insulation detection device and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215833542U (en) |
-
2021
- 2021-08-04 CN CN202121803208.9U patent/CN215833542U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8717038B2 (en) | Wiring testing device | |
| KR101457880B1 (en) | A high tension panel, low tension panel, dstribution panel and motor control panel for Fire Sensing Fuction | |
| CN112067970B (en) | Plate intelligent test system with verification function | |
| CN208188203U (en) | Insulation Resistance Tester for automotive power | |
| CN110058180A (en) | A kind of power battery pack system high pressure interlocking connector detection system | |
| US10852355B2 (en) | Electrical protection apparatus with test button | |
| CN100549703C (en) | The method that electrically contacts between the power switch of check power switch and the external node | |
| CN209280857U (en) | Diagnostic circuit, the Insulation Inspection System of Insulation Inspection System | |
| CN110568288A (en) | Device and method for diagnosing loosening of screw of terminal strip of switch cabinet | |
| KR101041398B1 (en) | Current monitoring apparatus of distributing board | |
| CN215833542U (en) | Insulation detection device and system | |
| CN107607785B (en) | A kind of dielectric resistance value detection circuit | |
| CN202748461U (en) | System for detecting state of protection pressing plate | |
| CN210572587U (en) | Insulation detection circuit, mainboard and relevant device | |
| US9134359B2 (en) | Power generating component connectivity testing | |
| CN108226614A (en) | A kind of high voltage power transmission acousto-optic electricity tester | |
| CN207764333U (en) | A kind of automobile-used bonding detecting system | |
| WO2019229534A3 (en) | Secure system that includes driving related systems | |
| CN202502139U (en) | High-voltage charged display device | |
| CN111566490B (en) | Insulation detection circuit, mainboard and relevant device | |
| CN207051411U (en) | A kind of ground line detection circuit and ground line testing device | |
| JP2001056354A (en) | Method for detecting contact failure due to fine short- circuiting on conductive conductor | |
| KR101582758B1 (en) | Method for Monitoring of Smart Junction Box and System thereof | |
| CN221746262U (en) | Real-time grounding detection circuit | |
| CN212379540U (en) | Security check instrument and strong current interphase short circuit detection circuit thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |