CN108107358A - Portable voltage mutual inductor auxiliary air closing detecting apparatus and method of discrimination - Google Patents
Portable voltage mutual inductor auxiliary air closing detecting apparatus and method of discrimination Download PDFInfo
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- CN108107358A CN108107358A CN201810074243.8A CN201810074243A CN108107358A CN 108107358 A CN108107358 A CN 108107358A CN 201810074243 A CN201810074243 A CN 201810074243A CN 108107358 A CN108107358 A CN 108107358A
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- 238000000034 method Methods 0.000 title claims description 7
- 238000012360 testing method Methods 0.000 claims abstract description 65
- 150000001875 compounds Chemical class 0.000 claims abstract description 56
- 238000002788 crimping Methods 0.000 claims abstract description 11
- 238000001514 detection method Methods 0.000 claims abstract description 11
- 230000002159 abnormal effect Effects 0.000 claims description 5
- ZTKQHJHANLVEBM-UHFFFAOYSA-N 2-[3-(ethylamino)-6-ethylimino-2,7-dimethylxanthen-9-yl]benzoic acid Chemical compound C1=2C=C(C)C(NCC)=CC=2OC2=CC(=NCC)C(C)=CC2=C1C1=CC=CC=C1C(O)=O ZTKQHJHANLVEBM-UHFFFAOYSA-N 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 239000000155 melt Substances 0.000 claims 1
- 101100088247 Picea mariana RPL13A gene Proteins 0.000 description 10
- 238000012423 maintenance Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Classifications
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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
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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- Stand-By Power Supply Arrangements (AREA)
Abstract
The present invention provides a kind of Portable voltage mutual inductor auxiliary air closing detecting apparatus, and wherein housing top surface is equipped with incoming line plug and outgoing line plug, can be at the crimping screw that is switched in auxiliary air of straight cutting；Earthing clamp is installed in the housing, the grounded screen that can be conveniently sandwiched in voltage transformer two-terminal case；Indicator lamp groups I are mounted in housing bottom surface, when can indicate that inlet wire is normal；Indicator lamp groups II are mounted in housing bottom surface, when being able to indicate that line voltage is normal；Detection module is mounted in housing, the indicator lamp groups I, indicator lamp groups II to be given to provide accessory power supply；Compound self-test button SB1 is mounted in housing side, realizes that main power source or selftest module are powered to indicator lamp groups I, and compound self-test button SB2 is mounted in housing side, realizes that main power source or selftest module are powered to indicator lamp groups II.The present invention is portable detector, can detect the failure of any place's voltage transformer secondary air switch at any time, convenient and practical.
Description
Technical field
The present invention relates to voltage transformer secondary air switches in substation, are specifically a kind of Portable voltage mutual inductor two
Secondary air switch test device.
Background technology
At present, secondary voltage fluctuation and abnormal conditions happen occasionally in substation, if voltage transformer is due to by resonance, electricity
The influences such as pressure fluctuation, moist condensation cause primary voltage mutual inductor exception or high-voltage insurance fusing to cause；Secondary voltage is simultaneously equipped
Put failure；Secondary connection and loop fault etc.；During secondary voltage exception, after operation maintenance personnel rushes for scene, if checking, voltage is mutual
When sensor is without exception, it need to go in security tool room or vehicle tool box to take on universal meter measurement voltage transformer secondary air switch
Lower port voltage, and then failure judgement scope, are further processed, since scene nothing intuitively reflects the device of secondary voltage, this
Judge that processing procedure takes time and effort, secondary protector, electricity metering and power supply safety are influenced when serious, do not have so far preferable
Solution.
The content of the invention
Present invention seek to address that during secondary voltage exception, can not intuitive judgment auxiliary air switch inlet wire, auxiliary air open
Close or auxiliary air switch after the whether abnormal problem of line-outgoing equipment, a kind of Portable voltage mutual inductor auxiliary air switch is provided
Detection device, quick failure judgement scope.
The present invention is realized with following technical solution：
A kind of Portable voltage mutual inductor auxiliary air closing detecting apparatus, including：
Housing, the housing top surface are equipped with incoming line plug and outgoing line plug, being capable of the crimping screw that is switched in auxiliary air of straight cutting
Place；
Earthing clamp is removably mounted in the housing, can conveniently be sandwiched in connecing in voltage transformer two-terminal case
Earth mat；
Indicator lamp groups I are mounted in the housing bottom surface, and are electrically connected with incoming line plug, right when can indicate that inlet wire is normal
Answer the single-phase normal condition of inlet wire；
Indicator lamp groups II are mounted in the housing bottom surface, and are electrically connected with outgoing line plug, are able to indicate that line voltage is normal
When, corresponding single-phase normal condition；
Detection module is mounted in the housing, the indicator lamp groups I, indicator lamp groups II to be given to provide accessory power supply；
Compound self-test button SB1 is mounted in the housing side, and is connected with the indicator lamp groups I, selftest module, real
Existing main power source or selftest module are powered to indicator lamp groups I；And
Compound self-test button SB2 is mounted in the housing side, and is connected with the indicator lamp groups II, selftest module, real
Existing main power source or selftest module are powered to indicator lamp groups II.
Preferably, the detection module includes：
Batteries to store energy module；
Charger is connected with the batteries to store energy module, charges to batteries to store energy module；And
Inverter module is connected with the batteries to store energy module, and electric energy in batteries to store energy module is reverse into alternating current.
Preferably, the indicator lamp groups I are yellow indicator light I, green indicator light I and red indicator light I, the indicator lamp groups II
For yellow indicator light II, green indicator light I II and red indicator light II.
Preferably, first in the compound self-test button SB1 is closed after contact is concatenated with yellow I phase of indicator light and forms
Branch mutually concatenated with the A phases end of incoming cables of incoming line plug, first normally opened contact and selftest module in compound self-test button SB1
It is connected；Second in the compound self-test button SB1 is closed the branch and inlet wire formed after contact is concatenated with green I phase of indicator light
The B phases end of incoming cables of plug mutually concatenates, and second normally opened contact in compound self-test button SB1 is connected with selftest module；It is described multiple
Close the 3rd in the self-test button SB1 C phase for being closed the branch formed after contact is concatenated with red I phase of indicator light and incoming line plug into
Line end is in parallel, and the 3rd normally opened contact in compound self-test button SB1 is connected with selftest module.
Preferably, first in the compound self-test button SB2 is closed structure after contact is concatenated with yellow II phase of indicator light
Into the A phase leading-out terminals of branch and outgoing line plug be in parallel, first normally opened contact in compound self-test button SB2 and self-test mould
Block is connected；Second in the compound self-test button SB1 be closed the branch that is formed after contact is concatenated with green II phase of indicator light and
The B phase leading-out terminals of outgoing line plug are in parallel, and second normally opened contact in compound self-test button SB2 is connected with selftest module；Institute
It states the 3rd in compound self-test button SB1 and is closed the branch formed after contact is concatenated with red II phase of indicator light and outgoing line plug
C phase leading-out terminals are in parallel, and the 3rd normally opened contact in compound self-test button SB2 is connected with selftest module.
Preferably, the charger is detachable is connected with batteries to store energy module.
Preferably, the transverse and longitudinal distance between the incoming line plug and outgoing line plug is switched with tested auxiliary air
Inlet-outlet line crimping screw is adapted.
A kind of Portable voltage mutual inductor auxiliary air closing detecting apparatus method of discrimination, method are：
Plug-in earthing clamp is sandwiched in after grounded screen is connected, at the crimping screw that housing straight cutting is switched in auxiliary air；
After compound self-test button is pressed, corresponding indicator light will be disconnected from main power source, then be powered by inverter module, and then
Check indicator light whether normal operation；
When being abnormal, if pressing compound self-test button SB1 rear indicator lights group I normally, refer to after unclamping compound self-test button SB1
Show that lamp group I is one or more to extinguish, can interpolate that as the fuse blows at the voltage transformer in blanking circuit, replace corresponding
Fuse；
If I normal operation of indicator lamp groups, indicator lamp groups II are extinguished and to press compound self-test button SB2 self-tests normal, can interpolate that
Auxiliary air switch fault replaces auxiliary air switch；If indicator lamp groups II are normal, it can interpolate that and switched for auxiliary air
Secondary connection after outlet or plant failure afterwards.
Advantageous effect of the present invention：
The present invention is portable detector, can detect the failure of any place's voltage transformer secondary air switch, side at any time
Just it is practical.The easy detection of voltage transformer secondary air switch in substation is realized, is intuitively sentenced by inlet-outlet line indicator light
Disconnected fault coverage handles secondary voltage exception, especially High-voltage Fuse Blow failure, quickly convenient for operation maintenance personnel rapid and convenient
Recover power transmission, improve power supply reliability.
Description of the drawings
Fig. 1 is a kind of Portable voltage mutual inductor auxiliary air closing detecting apparatus structure diagram；
Fig. 2 is a kind of Portable voltage mutual inductor auxiliary air closing detecting apparatus structure bottom view；
Fig. 3 is electrically connected schematic diagram for a kind of Portable voltage mutual inductor auxiliary air closing detecting apparatus.
Specific embodiment
Below in conjunction with attached drawing, by specific implementation, the present invention is further illustrated.
As shown in Figure 1 and Figure 2, a kind of Portable voltage mutual inductor auxiliary air closing detecting apparatus, should including housing 100
100 top surface of housing be equipped with incoming line plug 200 and outgoing line plug 300, can straight cutting in auxiliary air switch 1 crimping screw
Place, i.e. transverse and longitudinal distance between incoming line plug 200 and outgoing line plug 300 and the inlet-outlet line pressure on tested auxiliary air switch 1
Line screw is adapted.Indicator lamp groups I 3 and indicator lamp groups II 5 are additionally provided on 100 bottom surface of housing, indicator lamp groups I 3 are inserted with inlet wire
First 200 electrical connection, when can indicate that inlet wire is normal, the single-phase normal condition of corresponding inlet wire；Indicator lamp groups II 5 and outgoing line plug 300
Electrical connection, when being able to indicate that line voltage is normal, corresponding single-phase normal condition.
100 side of housing is equipped with the earthing clamp 400 of plug-in, can conveniently be sandwiched in 2 two-terminal case of voltage transformer
Interior grounded screen, i.e. earthing clamp 400 are round hole head with 100 junction of housing, and are equipped with and round hole head on housing 100
The circular hole syringe needle being adapted, and circular hole syringe needle is connected by conducting wire with indicator lamp groups I 3 and indicator lamp groups II 5, passes through round hole head
Wire clamp 400 is grounded with the cooperation of circular hole syringe needle to remove from 100 side of housing（With existing one original of mobile phone charging wire
Reason）.
Compound self-test button SB16 and compound self-test button SB27, compound self-test button are additionally provided on 100 side of housing
SB16 is connected with the indicator lamp groups I 3, selftest module 8, realizes that main power source or selftest module 8 are powered to indicator lamp groups I 3；It is multiple
It closes self-test button SB27 with the indicator lamp groups II 5, selftest module 8 to be connected, realizes main power source or selftest module 8 to indicator light
II 5 power supply of group.
Detection module 8 is mounted in the housing 100, the indicator lamp groups I 3, indicator lamp groups II 5 to be given to provide
Accessory power supply；The detection module 8 include batteries to store energy module 11, charger 9 and inverter module 10, charger 9 with it is described
Batteries to store energy module 11 is connected, and charges to batteries to store energy module 11；Inverter module 10 and the batteries to store energy mould
Block 11 is connected, and electric energy in batteries to store energy module 11 is reverse into alternating current.
Charger 9 is round hole head with 100 junction of housing, and is equipped with what is be adapted with round hole head on housing 100
Circular hole syringe needle, and circular hole syringe needle is connected by conducting wire with batteries to store energy module 11, is coordinated by round hole head and circular hole syringe needle
Realize that charger 9 can be removed from 100 side of housing（With existing one principle of mobile phone charging wire）.
A master switch 500 is additionally provided on 100 side of housing, is serially connected in batteries to store energy module 11 and inverter module
Between 10, for the on-off switch of the detection device.
As shown in figure 3, the indicator lamp groups I 3 are yellow indicator light I, green indicator light I and red indicator light I, the indicator lamp groups
II 5 be yellow indicator light II, green indicator light I II and red indicator light II.
First in the compound self-test button SB16 be closed the branch that is formed after contact is concatenated with yellow I phase of indicator light and
The A phases end of incoming cables of incoming line plug 200 mutually concatenates, first normally opened contact in compound self-test button SB16 and 10 phase of inverter module
Even；Second in the compound self-test button SB16 is closed the branch and inlet wire formed after contact is concatenated with green I phase of indicator light
The B phases end of incoming cables of plug 200 mutually concatenates, and second normally opened contact in compound self-test button SB16 is connected with inverter module 10；
The 3rd in the compound self-test button SB16 is closed the branch and incoming line plug formed after contact is concatenated with red I phase of indicator light
200 C phases end of incoming cables is in parallel, and the 3rd normally opened contact in compound self-test button SB16 is connected with inverter module 10.
First in the compound self-test button SB27 is closed the branch formed after contact is concatenated with yellow II phase of indicator light
It is in parallel with the A phase leading-out terminals of outgoing line plug 300, first normally opened contact in compound self-test button SB27 and inverter module 10
It is connected；Second in the compound self-test button SB16 is closed the branch formed after contact is concatenated with green II phase of indicator light with going out
The B phase leading-out terminals of line plug 300 are in parallel, second normally opened contact in compound self-test button SB27 and 10 phase of inverter module
Even；The 3rd in the compound self-test button SB16 is closed the branch formed after contact is concatenated with red II phase of indicator light and outlet
The C phase leading-out terminals of plug 300 are in parallel, and the 3rd normally opened contact in compound self-test button SB27 is connected with inverter module 10.
A kind of Portable voltage mutual inductor auxiliary air closing detecting apparatus method of discrimination is as follows：
Plug-in earthing clamp 400 is sandwiched in after grounded screen is connected, by 100 straight cutting of housing in the crimping of auxiliary air switch 1
At screw, i.e., incoming line plug 200 is in contact with the end of incoming cables crimping screw of auxiliary air switch 1, outgoing line plug 300 and secondary sky
The leading-out terminal crimping screw of air cock 1 is in contact；
After compound self-test button is pressed, corresponding indicator light will be disconnected from main power source, then be powered by inverter module 10, into
And check indicator light whether normal operation；
When being abnormal, if pressing compound self-test button SB17 rear indicator lights group I 3 normally, compound self-test button SB17 is unclamped
Rear indicator light group I 3 is extinguished（By taking A phases as an example）, can interpolate that and melted for the A phases fuse 4 at the voltage transformer 2 in blanking circuit
It is disconnected, replace A phases fuse 4；
If I 3 normal operation of indicator lamp groups, indicator lamp groups II 5 are extinguished and to press compound self-test button SB27 self-tests normal, can sentence
Disconnected auxiliary air switchs 1 failure, replaces auxiliary air switch 1；If indicator lamp groups II 5 are normal, can interpolate that as secondary sky
Secondary connection after 1 outlet of air cock or plant failure afterwards.
The present invention is portable detector, can detect the event of any place's voltage transformer secondary air switch at any time
Barrier, it is convenient and practical.The easy detection of voltage transformer secondary air switch in substation is realized, it is straight by inlet-outlet line indicator light
Failure judgement scope is seen, secondary voltage exception, especially High-voltage Fuse Blow failure are handled convenient for operation maintenance personnel rapid and convenient,
Fast quick-recovery power transmission, improves power supply reliability.
It the above is only the preferred embodiment of the present invention, it should be pointed out that：Come for those skilled in the art
It says, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should be regarded as
Protection scope of the present invention.
Claims (8)
1. a kind of Portable voltage mutual inductor auxiliary air closing detecting apparatus, which is characterized in that including：
Housing（100）, the housing（100）Top surface is equipped with incoming line plug（200）And outgoing line plug（300）, can straight cutting in two
Secondary air switch（1）Crimping screw at；
Earthing clamp（400）, it is removably mounted to the housing（100）In, it can conveniently be sandwiched in voltage transformer（2）Two
Grounded screen in terminal box；
Indicator lamp groups I（3）, it is mounted on the housing（100）On bottom surface, and and incoming line plug（200）Electrical connection, can indicate
When inlet wire is normal, the single-phase normal condition of corresponding inlet wire；
Indicator lamp groups II（5）, it is mounted on the housing（100）On bottom surface, and and outgoing line plug（300）Electrical connection, can refer to
When showing that line voltage is normal, corresponding single-phase normal condition；
Detection module（8）, it is mounted on the housing（100）It is interior, to give the indicator lamp groups I（3）, indicator lamp groups II（5）
Accessory power supply is provided；
Compound self-test button SB1（6）, it is mounted on the housing（100）On side, and with the indicator lamp groups I（3）, self-test
Module（8）It is connected, realizes main power source or selftest module（8）To indicator lamp groups I（3）Power supply；And
Compound self-test button SB2（7）, it is mounted on the housing（100）On side, and with the indicator lamp groups II（5）, self-test
Module（8）It is connected, realizes main power source or selftest module（8）To indicator lamp groups II（5）Power supply.
2. Portable voltage mutual inductor auxiliary air closing detecting apparatus according to claim 1, which is characterized in that described
Detection module（8）Including：
Batteries to store energy module（11）；
Charger（9）, with the batteries to store energy module（11）It is connected, to batteries to store energy module（11）It charges；And
Inverter module（10）, with the batteries to store energy module（11）It is connected, by batteries to store energy module（11）Middle electric energy inversion
Into alternating current.
3. Portable voltage mutual inductor auxiliary air closing detecting apparatus according to claim 1, it is characterised in that：It is described
Indicator lamp groups I（3）For yellow indicator light I, green indicator light I and red indicator light I, the indicator lamp groups II（5）For yellow indicator light II, green
Indicator light I II and red indicator light II.
4. Portable voltage mutual inductor auxiliary air closing detecting apparatus according to claim 3, it is characterised in that：
The compound self-test button SB1（6）In first be closed the branch that is formed after contact is concatenated with yellow I phase of indicator light and into
Line plug（200）A phases end of incoming cables mutually concatenate, compound self-test button SB1（6）In first normally opened contact and selftest module
（8）It is connected；
The compound self-test button SB1（6）In second be closed after contact is concatenated with green I phase of indicator light the branch that forms and into
Line plug（200）B phases end of incoming cables mutually concatenate, compound self-test button SB1（6）In second normally opened contact and selftest module
（8）It is connected；
The compound self-test button SB1（6）In the 3rd be closed after contact is concatenated with red I phase of indicator light the branch that forms and into
Line plug（200）C phases end of incoming cables be in parallel, compound self-test button SB1（6）In the 3rd normally opened contact and selftest module
（8）It is connected.
5. Portable voltage mutual inductor auxiliary air closing detecting apparatus according to claim 3, it is characterised in that：
The compound self-test button SB2（7）In first be closed the branch that is formed after contact is concatenated with yellow II phase of indicator light and
Outgoing line plug（300）A phase leading-out terminals be in parallel, compound self-test button SB2（7）In first normally opened contact and selftest module
（8）It is connected；
The compound self-test button SB1（6）In second be closed after contact is concatenated with green II phase of indicator light the branch that forms and
Outgoing line plug（300）B phase leading-out terminals be in parallel, compound self-test button SB2（7）In second normally opened contact and selftest module
（8）It is connected；
The compound self-test button SB1（6）In the 3rd be closed after contact is concatenated with red II phase of indicator light the branch that forms and
Outgoing line plug（300）C phase leading-out terminals be in parallel, compound self-test button SB2（7）In the 3rd normally opened contact and selftest module
（8）It is connected.
6. Portable voltage mutual inductor auxiliary air closing detecting apparatus according to claim 3, it is characterised in that：
The charger（9）Detachable and batteries to store energy module（11）It is connected.
7. Portable voltage mutual inductor auxiliary air closing detecting apparatus according to claim 1, it is characterised in that：
The incoming line plug（200）And outgoing line plug（300）Between transverse and longitudinal distance switched with tested auxiliary air（1）On
Inlet-outlet line crimping screw is adapted.
8. one kind is sentenced based on claim 1 to 7 any one of them Portable voltage mutual inductor auxiliary air closing detecting apparatus
Other method, it is characterised in that：
By plug-in earthing clamp（400）It is sandwiched in after grounded screen is connected, by housing（100）Straight cutting is switched in auxiliary air（1）
Crimping screw at；
After compound self-test button is pressed, corresponding indicator light will be disconnected from main power source, then pass through inverter module（10）Power supply,
And then check indicator light whether normal operation；
When being abnormal, if pressing compound self-test button SB1（7）Rear indicator light group I（3）Normally, compound self-test button is unclamped
SB1（7）Rear indicator light group I（3）One or more is extinguished, and can interpolate that as the voltage transformer in blanking circuit（2）It melts at place
Disconnected device（4）Fusing, replaces corresponding fuse（4）；
If indicator lamp groups I（3）Normal operation, indicator lamp groups II（5）Extinguish and press compound self-test button SB2（7）Self-test is normal,
It can interpolate that auxiliary air switchs（1）Failure replaces auxiliary air switch（1）；If indicator lamp groups II（5）Normally, can
It is judged as that auxiliary air switchs（1）Secondary connection after outlet or plant failure afterwards.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810074243.8A CN108107358A (en) | 2018-01-25 | 2018-01-25 | Portable voltage mutual inductor auxiliary air closing detecting apparatus and method of discrimination |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810074243.8A CN108107358A (en) | 2018-01-25 | 2018-01-25 | Portable voltage mutual inductor auxiliary air closing detecting apparatus and method of discrimination |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108107358A true CN108107358A (en) | 2018-06-01 |
Family
ID=62221068
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810074243.8A Pending CN108107358A (en) | 2018-01-25 | 2018-01-25 | Portable voltage mutual inductor auxiliary air closing detecting apparatus and method of discrimination |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108107358A (en) |
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| CN203536927U (en) * | 2013-10-30 | 2014-04-09 | 安徽英特电子有限公司 | Emergency protection circuit provided with indicating lamp |
| CN204044202U (en) * | 2014-07-25 | 2014-12-24 | 国家电网公司 | A kind of power failure changes the Apparatus and system of electric energy meter |
| CN205985816U (en) * | 2016-07-14 | 2017-02-22 | 国网山东省电力公司平原县供电公司 | Novel customer end power table case |
| CN106771801A (en) * | 2016-11-28 | 2017-05-31 | 国家电网公司 | A kind of capacitor bank on-Line Monitor Device and its application process |
| CN107132463A (en) * | 2017-06-09 | 2017-09-05 | 国网吉林省电力有限公司长春供电公司 | Secondary windings of PT short-circuit preventing device |
| CN207780186U (en) * | 2018-01-25 | 2018-08-28 | 国网江苏省电力有限公司徐州供电分公司 | A kind of Portable voltage mutual inductor auxiliary air closing detecting apparatus |
-
2018
- 2018-01-25 CN CN201810074243.8A patent/CN108107358A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2657009Y (en) * | 2003-09-26 | 2004-11-17 | 阮建民 | Two-arrangement three-phase six-way display module |
| CN201638318U (en) * | 2010-03-09 | 2010-11-17 | 内江电业局 | Low-voltage acousto-optic alarm switch |
| CN202362353U (en) * | 2011-11-17 | 2012-08-01 | 浙江江山华安电器制造有限公司 | Potential indicator having self-check function |
| CN202676851U (en) * | 2012-06-26 | 2013-01-16 | 中国西电电气股份有限公司 | Secondary circuit short circuit-proof detection device for hand-held voltage transformer |
| CN203536927U (en) * | 2013-10-30 | 2014-04-09 | 安徽英特电子有限公司 | Emergency protection circuit provided with indicating lamp |
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Application publication date: 20180601 |