CN112710968B - Secondary circuit short-term test break-make device - Google Patents
Secondary circuit short-term test break-make device Download PDFInfo
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- CN112710968B CN112710968B CN202011299945.XA CN202011299945A CN112710968B CN 112710968 B CN112710968 B CN 112710968B CN 202011299945 A CN202011299945 A CN 202011299945A CN 112710968 B CN112710968 B CN 112710968B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/54—Testing for continuity
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Abstract
The application relates to a secondary circuit short-term test break-make device. The secondary circuit rapid detection on-off device comprises a shell, a test interface, a test selection button, a switch control device, a plurality of status indicator lamps and a status display device. The test interface is arranged on the shell and used for connecting the secondary plug. The test selection button is arranged on the shell. The test selection button is used for selecting different types of switches according to the type of the secondary plug connected with the test interface. The switch control device is arranged on the shell. The switch control device is used for controlling the opening and closing states of the switch. The plurality of status indicator lamps are arranged on the shell and are used for indicating the on and off states of the plurality of secondary circuits corresponding to the switch under the opening and closing states of the switch. The state display device is arranged on the shell. The state display device is used for displaying whether the conduction and closing states of the secondary circuit are normal or not.
Description
Technical Field
The application relates to the field of power generation, in particular to a secondary circuit rapid detection on-off device.
Background
In the nuclear power generation field, according to the maintenance requirement of a nuclear power station, the on-off condition of a secondary circuit of a switch under the conditions of opening and closing is required to be measured. When the opening and closing states are different, the secondary circuit is also different in opening and closing. In the prior art, a digital code on a switch plug is usually observed, then a contact pin corresponding to a secondary node loop is found, finally, a meter pen of a universal meter is used for butt joint measurement, a resistance reading is observed, and the resistance reading is recorded in a program. After the measurement of one pair of contact loops is completed, the next loop is continuously measured, and each switch needs to measure 14-16 loop on-off conditions. However, the measurement method generally requires human eyes to search for the pins, is prone to error, takes a lot of time, and has low work efficiency.
Disclosure of Invention
Based on this, it is necessary to provide a secondary circuit rapid detection on-off device for the above problems.
A secondary circuit rapid detection on-off device comprises:
a housing;
the test interface is arranged on the shell and used for connecting the secondary plug;
the test selection button is arranged on the shell and is used for selecting different types of switches according to the type of the secondary plug connected with the test interface;
the switch control device is arranged on the shell and used for controlling the opening and closing states of the switch;
the plurality of state indicating lamps are arranged on the shell and are used for indicating the on and off states of a plurality of secondary circuits corresponding to the switch in the opening and closing states of the switch;
and the state display device is arranged on the shell and is used for displaying whether the conduction state and the closing state of the secondary circuit are normal or not.
In one embodiment, further comprising:
comparing the circuit cards; the state display device is connected with the test interface and the state display device and is used for measuring the resistance of the secondary circuit corresponding to the switch and outputting a control signal according to a measurement result, and the state display device displays whether the conduction state and the closing state of the secondary circuit are normal or not according to the control signal.
In one embodiment, the system further comprises a programmable controller connected with the comparison circuit card and the state display device and used for receiving the control signal and displaying whether the conduction state and the closing state of the secondary loop are normal or not according to the control signal.
In one embodiment, the comparison circuit card includes:
the positive input end of the operational amplifier is used for being connected with the secondary circuit;
and the reverse input end of the operational amplifier is connected with the adjusting resistor, and the output end of the operational amplifier is connected with the programmable controller and is used for outputting a control signal to the programmable controller.
In one embodiment, the comparison circuit card further comprises a power supply module connected to the operational amplifier for supplying power to the operational amplifier.
In one embodiment, the comparison circuit card further comprises a voltage conversion device connected between the power supply module and the operational amplifier.
In one embodiment, the output end of the operational amplifier is further connected with the status indicator lamp, and is used for controlling whether the status indicator lamp is lighted or not.
In one embodiment, the device further comprises a test reset button, which is arranged on the shell and connected with the programmable controller.
In one embodiment, the device further comprises a plurality of switch test indicator lights for displaying the type of switch connected to the test interface.
In one embodiment, the status display device includes a test fault indicator and a test pass indicator.
The embodiment of the application provides a secondary circuit rapid detection on-off device. The secondary circuit rapid detection on-off device comprises a shell, a test interface, a test selection button, a switch control device, a plurality of status indicator lamps and a status display device. The test interface is arranged on the shell and used for connecting the secondary plug. The test selection button is arranged on the shell. The test selection button is used for selecting different types of switches according to the type of the secondary plug connected with the test interface. The switch control device is arranged on the shell. The switch control device is used for controlling the opening and closing states of the switch. The plurality of status indicator lamps are arranged on the shell and are used for indicating the on and off states of the plurality of secondary circuits corresponding to the switch under the opening and closing states of the switch. The state display device is arranged on the shell. The state display device is used for displaying whether the conduction and closing states of the secondary circuit are normal or not.
Drawings
FIG. 1 is a schematic diagram of an operation panel of a secondary circuit rapid detection on-off device provided in an embodiment of the present application;
FIG. 2 is a schematic diagram of a connection between a comparison circuit card and a programmable controller according to one embodiment of the present application;
FIG. 3 is a schematic diagram of a comparison circuit card according to one embodiment of the present application;
fig. 4 is a circuit diagram of a programmable controller according to an embodiment of the present application.
Reference numerals illustrate:
the secondary loop rapid detection on-off device 10, a shell 100, a test interface, a test selection button 120, a switch control device 130, a status indicator light 140, a status display device 150, a fault detection indicator light 152, a test passing indicator light 154, a test reset button 160, a switch test indicator light 170, a comparison circuit card 200, an operational amplifier 210, a regulating resistor 220, a programmable controller 300, a power module 400 and a voltage conversion device 500.
Detailed Description
In order to make the objects, technical schemes and advantages of the present application more clear, the following embodiments are used for further describing the secondary circuit rapid detection on-off device of the present application in detail by combining the accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning. The terms "coupled" and "connected," as used herein, are intended to encompass both direct and indirect coupling (coupling), unless otherwise indicated. In the description of the present application, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc. indicate or refer to an orientation or positional relationship based on that shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
In this application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
Referring to fig. 1, an embodiment of the present application provides a secondary circuit rapid detection on-off device 10. The secondary circuit rapid detection on-off device 10 comprises a housing 100, a test interface, a test selection button 120, a switch control device 130, a plurality of status indicator lamps 140 and a status display device 150. The housing 100 may be a box-packed structure. A hardware structure such as a circuit board may be disposed in the housing 100. A control panel may be provided on one surface of the housing 100. The housing 100 may have a cover. The cover body can be used for being buckled on the surface of the control panel to protect the control panel.
The test interface is disposed in the housing 100. The test interface is used for connecting the secondary plug. The test interface may be provided at a side of the housing 100. It will be appreciated that the type of secondary plug corresponds to the type of switch. I.e. one of said secondary plugs may be plugged with a switch. The switch can be a multi-type medium voltage switch of a nuclear power station. Each of the switches may correspond to a plurality of secondary circuits. The secondary plug may have a plurality of pins therein. Each of the pins may be connected to one of the secondary circuits. Thus, each of the secondary circuits may be connected to a circuit board within the housing 100 when the switch is inserted into the test interface. Therefore, the secondary circuit rapid detection on-off device 10 can perform on-off detection on the secondary circuits corresponding to different types of switches. The switch types may include "two-core breaker", "two-core contactor", "three-core breaker", "three-core contactor R4000N", "three-core contactor R400N". These five switches are 6.6kV switches. The circuit breaker is mainly used for incoming line power supply control of a distribution board, and the contactor is mainly used for a 6.6kV motor and a 6.6kV/380V transformer. Each of the switch types may correspond to a type of switch plug.
In one embodiment, the secondary circuit rapid detection on-off device 10 may include five adjustable gears. Each of the gear positions may correspond to a type of switch.
The test selection button 120 is provided to the housing 100. The test selection button 120 is used for selecting different types of switches according to the type of the secondary plug connected with the test interface. For example, after the test interface is plugged into a plug corresponding to the two-core circuit breaker, the test selection button 120 selects the working mode of the secondary circuit rapid detection on-off device 10, so that the working mode of the secondary circuit rapid detection on-off device 10 is matched with the two-core circuit breaker.
The switch control device 130 is provided in the housing 100. The switch control device 130 is used for controlling the opening and closing states of the switch. That is, whether the secondary circuit in the switch is normal or not can be tested according to the opening and closing of the switch by controlling the switch. The number of secondary circuits of the switch can be determined by the maintenance requirements of factory installation and nuclear power. Each of the switches may include a wire and a micro switch.
The status indicator lamps 140 are disposed on the housing 100. The status indicator lamps 140 are used for indicating the on and off states of the secondary circuits corresponding to the switch in the opening and closing states. It is understood that each status indicator light 140 may correspond to a secondary circuit of the switch corresponding to the secondary plug inserted into the test interface. When one of the status indicator lamps 140 is lighted, the secondary circuit corresponding to the status indicator lamp 140 may be considered to be closed. When one of the status indication lamps 140 is turned off, the secondary circuit corresponding to the status indication lamp 140 may be considered to be disconnected. In one embodiment, if the status indicator light 140 is green, the secondary circuit corresponding to the indicator light may be considered to be in a connected state. When the status indicator lamp 140 is displayed in yellow, the secondary circuit corresponding to the indicator lamp is considered to be in a disconnected state.
The status display device 150 is provided in the housing 100. The status display device 150 is configured to display whether the on and off states of the secondary circuit are normal, that is, whether the on state and off state of the secondary circuit are normal may be displayed by the status display device 150.
The secondary circuit provided by the embodiment of the application is used for rapidly detecting the on-off device 10. The secondary circuit rapid detection on-off device 10 comprises a housing 100, a test interface, a test selection button 120, a switch control device 130, a plurality of status indicator lamps 140 and a status display device 150. The test interface is disposed in the housing 100 and is used for connecting with a secondary plug. The test selection button 120 is provided to the housing 100. The test selection button 120 is used for selecting different types of switches according to the type of the secondary plug connected with the test interface. The switch control device 130 is provided in the housing 100. The switch control device 130 is used for controlling the opening and closing states of the switch. The status indicator lamps 140 are disposed in the housing 100, and are used for indicating the on and off states of the secondary circuits corresponding to the switch in the opening and closing states. The status display device 150 is provided in the housing 100. The state display device 150 is used for displaying whether the on and off states of the secondary circuit are normal. Therefore, the secondary circuit rapid detection on-off device 10 can connect the secondary plug through the test interface at one time, and detect a plurality of secondary circuits of the switch corresponding to the secondary plug. The secondary circuit of the switch is measured by using the secondary circuit rapid detection on-off device 10, so that the contact pin searching by human eyes can be avoided, the measuring accuracy is improved, and the working efficiency is improved. The secondary circuit rapid detection on-off device 10 can be conveniently carried and used flexibly and conveniently.
In one embodiment, the status display device 150 may display normal when all of the secondary circuits are operating normally. The status display device 150 may indicate an abnormality when a problem occurs in one of the secondary circuits. The secondary circuit may then be further inspected.
In one embodiment, after the test interface is plugged, the corresponding switch may be selected by the test selection button 120 according to the secondary plug plugged into the test interface. I.e. one of the five switches is selected. The opening and closing state of the switch is then controlled by the switch control means 130. When the switch is turned off, the switch control device 130 controls the secondary circuit rapid detection on-off device 10 to be in the off test mode, and the status indicator lamps 140 corresponding to the secondary circuits in the switch are turned on or off. When the switch control device 130 controls the secondary circuit rapid detection on-off device 10 to be in a closing mode, the status indicator lamps 140 corresponding to the secondary circuits in the switch are turned on or off. If the result is normal, the status display means 150 displays normal. If the test is abnormal, the status display device 150 gives a fault alarm. In one embodiment, each of the switches may correspond to 14-16 pairs of secondary loops: when the switch control device 130 controls the switch to be off (6.6 kV side), the switch control device 14-16 conducts the secondary circuit (125 VDC/48 VDC) node and closes the secondary circuit. For some secondary circuits, the status indicator lamp 140 corresponding to the secondary circuit should be turned on, and the status indicator lamp 140 should not be turned on when the secondary circuit is turned off. If the status indicator lamp 140 which is lighted at this time is not lighted, it indicates that there is an abnormality, and finally, a fault alarm is given.
In one embodiment, the secondary loop rapid detection on-off device 10 includes a comparison circuit card 200. The comparison circuit card 200 is connected to the test interface and the status display device 150. The comparison circuit card 200 is used for measuring the resistance of the secondary circuit corresponding to the switch and outputting a control signal according to the measurement result. The state display device 150 displays whether the on and off states of the secondary circuit are normal according to the control signal.
Referring to fig. 2, the comparison circuit card 200 may be provided with a comparison circuit. The comparison circuit can judge the on-off state of the secondary circuit by measuring the resistance of the secondary circuit. In one embodiment, a resistance threshold value at which the comparison circuit can output the control signal may be set. For example, when the resistance is set to 5 ohms, it is determined that the secondary circuit is in the on state. When the resistance of the secondary circuit is greater than 5 ohms, it can be judged that the secondary circuit belongs to an off state. The control signal may output different signals according to the magnitude of the secondary resistor to control the display state of the state display device 150.
In one embodiment, the secondary loop rapid detection on-off device 10 further includes a programmable controller 300. The programmable controller 300 is connected to the comparison circuit card 200 and the status display device 150. The programmable controller 300 is configured to receive the control signal and display whether the on and off states of the secondary circuit are normal according to the control signal. The programmable controller 300 may be preset with a logic program according to the requirement, so as to achieve the purpose of controlling the status display device 150 to display by the control signal.
In one embodiment, the comparison circuit card 200 includes an operational amplifier 210 and a conditioning resistor 220. The positive input of the operational amplifier 210 is used for connection to the secondary loop. An inverting input of the operational amplifier 210 is connected to the regulator resistor 220. The output end of the operational amplifier 210 is connected to the programmable controller 300, and is configured to output a control signal to the programmable controller 300. The magnitude of the resistance of the secondary loop is related to the voltage at the positive input of the operational amplifier 210. And the high and low levels output from the output of the operational amplifier 210 are related to the voltage levels of the positive and negative inputs of the operational amplifier 210. It is thus possible to control whether the output terminal of the operational amplifier 210 outputs a high level control signal or a low level control signal by setting the voltage magnitude relation of the forward input terminal and the reverse input terminal of the operational amplifier 210. By adjusting the size of the adjusting resistor 220, the relationship between the resistance of the secondary loop and the size of the adjusting resistor 220 can be adjusted, so as to control the high level control signal or the low level control signal of the output of the operational amplifier 210. In one embodiment, the adjusting resistor 220 may be a sliding resistor.
In one embodiment, the output of the operational amplifier 210 outputs a high level control signal when the voltage at the positive input of the operational amplifier 210 is greater than the voltage at the negative input of the operational amplifier 210. When the voltage of the inverting input terminal of the operational amplifier 210 is smaller than the voltage of the non-inverting input terminal of the operational amplifier 210, the output terminal of the operational amplifier 210 outputs a low level signal. By adjusting the size of the adjusting resistor 220, the potential of the inverting input terminal of the operational amplifier 210 can be changed, so that parameter adjustment can be realized, and thus the measurement range can be expanded.
In one embodiment, the programmable controller 300 has no input when the output of the operational amplifier 210 is a high signal. The programmable controller 300 inputs receive the control signal when the output of the operational amplifier 210 is a low level signal. The status indicator lamp 140 corresponding to the secondary circuit may be controlled to be turned on or off by the logic control of the programmable controller 300.
In one embodiment, the voltage at the inverting input of the operational amplifier 210
Wherein V1 is the voltage between R1 and the measurement resistor. The measured resistance is the equivalent resistance of the secondary loop.
In one embodiment, the comparison circuit card 200 further includes a power module 400. The power module 400 is connected to the operational amplifier 210. The power module 400 is configured to supply power to the operational amplifier 210. In one embodiment, the power module 400 may be a 24V lithium battery. The power module 400 may be charged with a 220VAC power connection. The power module 400 may also be directly connected to 16 status indication lamps 140. The power module 400 is configured to supply power to the 16 status indication lamps 140.
In one embodiment, the comparison circuit card 200 further includes a voltage conversion device 500. The voltage conversion device 500 is connected between the power module 400 and the operational amplifier 210. In one embodiment, the voltage conversion device 500 may be a 24V to 5V power card. After being converted by the voltage converting device 500, the power module 400 may supply power to a plurality of operational amplifiers 210.
Referring to fig. 3, in one embodiment, the secondary loop rapid detection on-off device 10 may include 4 comparison circuit cards 200. Each of the comparison circuit cards 200 may include four of the operational amplifiers 210. Each of the comparison circuit cards 200 may implement 4 resistance measurement functions. Therefore, the secondary circuit rapid detection on-off device 10 can measure the resistance values of 16 secondary circuits at a time, and is efficient and convenient.
In one embodiment, the output terminal of the operational amplifier 210 is further connected to the status indicator light 140, for controlling whether the status indicator light 140 is on. When the output terminal of the operational amplifier 210 outputs a high level signal, the status indicator lamp 140 may be turned off under the control of the programmable controller 300. When the output terminal of the operational amplifier 210 outputs a low level signal, the status indicator lamp 140 may be turned on under the control of the programmable controller 300.
In one embodiment, the secondary loop rapid test on-off device 10 further includes a test reset button 160. The test reset button 160 is disposed on the housing 100. The test reset button 160 may be coupled to the programmable controller 300. The reset button can reset the current fault state so as to record and overhaul.
In one embodiment, the secondary loop rapid detection on-off device 10 further includes a plurality of switch test indicator lights 170. The switch test indicator light 170 is used to display the type of switch connected to the test interface. I.e. the type of the secondary plug inserted by the test interface corresponds to the plurality of switch test indicator lights 170 one by one.
The "two-core breaker", "two-core contactor", "three-core breaker", "three-core contactor R4000N", "three-core contactor R400N" may correspond to one of the secondary plugs, respectively. The "two-core breaker", "two-core contactor", "three-core breaker", "three-core contactor R4000N" and "three-core contactor R400N" also correspond to one switch test indicator light 170, respectively. Therefore, when a certain secondary plug is inserted, the switch test indicator lamp 170 corresponding thereto is also lighted.
In one embodiment, the status display device 150 includes a measured fault indicator 152 and a test pass indicator 154. The fault indicator 152 is illuminated when the test results reflect a fault in the secondary circuit of the switch. When the test results reflect that the secondary circuit of the switch is functioning properly, the test is illuminated by the indicator light 154.
Referring to fig. 4, a schematic wiring diagram of the programmable controller 300 is shown. The programmable controller 300 has no input when the operational amplifier 210 outputs a high level signal. When the operational amplifier 210 outputs a low level signal, the indication lamp corresponding to the programmable controller 300 is turned on. The programmable controller 300 can control the working states of the fault detection indicator 152, the test passing indicator 154, the switch control device 130, the test selection button 120, the test reset button 160 and the like through preset programs.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the patent. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.
Claims (10)
1. The utility model provides a secondary circuit short-term test break-make device which characterized in that includes:
a housing;
the test interface is arranged on the shell and used for connecting the secondary plug;
the test selection button is arranged on the shell and is used for selecting different types of switches according to the type of the secondary plug connected with the test interface;
the switch control device is arranged on the shell and used for controlling the opening and closing states of the switch;
the state indicating lamps are arranged on the shell and are used for indicating the on and off states of a plurality of secondary circuits corresponding to the switch in the opening and closing states of the switch, wherein each state indicating lamp corresponds to one secondary circuit of the switch corresponding to the secondary plug inserted into the test interface;
the state display device is arranged on the shell and is used for displaying whether the conduction and closing states of the secondary circuit are normal or not;
the state display device comprises a fault detection indicator lamp and a test passing indicator lamp, when the plurality of secondary circuits work normally, the test passing indicator lamp is lightened, and when at least one secondary circuit fails, the fault detection indicator lamp is lightened;
the comparison circuit card is connected with the test interface and the state display device and is used for measuring the resistance of the secondary circuit corresponding to the switch and outputting a control signal according to a measurement result, and the state display device displays whether the conduction state and the closing state of the secondary circuit are normal or not according to the control signal;
the comparison circuit card includes:
the positive input end of the operational amplifier is connected with the secondary circuit, the output end of the operational amplifier is connected with the state display device and is used for outputting a control signal, and the state display device displays whether the conduction state and the closing state of the secondary circuit are normal or not according to the control signal;
and the adjusting resistor is connected with the reverse input end of the operational amplifier and is used for adjusting the potential of the reverse input end of the operational amplifier.
2. The rapid detection on-off device for the secondary circuit according to claim 1, further comprising a programmable controller connected with the comparison circuit card and the state display device, for receiving the control signal and displaying whether the on-state and the off-state of the secondary circuit are normal according to the control signal.
3. The secondary circuit rapid detection on-off device according to claim 2, wherein,
the output end of the operational amplifier is connected with the programmable controller and is used for outputting a high-level control signal when the voltage of the positive input end of the operational amplifier is larger than the voltage of the negative input end of the operational amplifier; when the voltage of the reverse input end of the operational amplifier is larger than the voltage of the positive input end of the operational amplifier, the output end of the operational amplifier outputs a low-level signal.
4. The rapid detection on-off device for a secondary circuit according to claim 3, wherein,
the programmable controller is connected with the plurality of status indicator lamps and is used for controlling the status indicator lamps to be turned off when the programmable controller receives a high-level signal;
and when the programmable controller receives a low-level signal, the programmable controller controls the state indicator lamp to be lightened.
5. The secondary loop rapid detection on-off device of claim 4, wherein the comparison circuit card further comprises a power module connected to the operational amplifier for powering the operational amplifier.
6. The secondary loop rapid detection on-off device of claim 5, wherein the comparison circuit card further comprises a voltage conversion device connected between the power module and the operational amplifier.
7. The secondary loop rapid detection on-off device of claim 4, wherein the output end of the operational amplifier is further connected with the status indicator lamp for controlling whether the status indicator lamp is lighted.
8. The secondary circuit rapid detection on-off device of claim 4, further comprising a test reset button disposed on the housing and connected to the programmable controller.
9. The secondary loop rapid detection on-off device of claim 1, further comprising a plurality of switch test indicator lights for displaying a type of switch connected to the test interface.
10. The secondary circuit rapid detection on-off device according to claim 6, wherein the voltage conversion device is a 24V to 5V power card.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011299945.XA CN112710968B (en) | 2020-11-19 | 2020-11-19 | Secondary circuit short-term test break-make device |
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| CN202011299945.XA CN112710968B (en) | 2020-11-19 | 2020-11-19 | Secondary circuit short-term test break-make device |
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| CN112710968B true CN112710968B (en) | 2023-06-09 |
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| CN201184891Y (en) * | 2008-01-11 | 2009-01-21 | 俞盛荣 | Detection module for short/open circuit of current mutual inductor secondary circuit |
| CN202815132U (en) * | 2012-08-23 | 2013-03-20 | 中国西电集团公司 | High-tension switch cabinet secondary wiring detection device |
| CN104360218A (en) * | 2014-11-20 | 2015-02-18 | 国网河北阜城县供电公司 | Breaker secondary circuit wiring detecting device and breaker replacing method |
| CN206602702U (en) * | 2016-06-24 | 2017-10-31 | 河北九英电气设备有限公司 | Electric ballast and UV lamp |
| CN206074763U (en) * | 2016-09-22 | 2017-04-05 | 陕西华电蒲城发电有限责任公司 | Handcart type high-voltage switch device for quick testing |
| CN206710530U (en) * | 2017-05-12 | 2017-12-05 | 河南亿达电缆有限责任公司 | Cable core break-make detects warning device |
| CN107516481A (en) * | 2017-08-18 | 2017-12-26 | 京东方科技集团股份有限公司 | Display module protection device and method, test board and display module |
| CN211785761U (en) * | 2020-02-18 | 2020-10-27 | 北方民族大学 | Transformer substation secondary circuit state monitoring device |
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