CN207946515U - Mutual inductor polarity tester - Google Patents
Mutual inductor polarity tester Download PDFInfo
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- CN207946515U CN207946515U CN201820439674.5U CN201820439674U CN207946515U CN 207946515 U CN207946515 U CN 207946515U CN 201820439674 U CN201820439674 U CN 201820439674U CN 207946515 U CN207946515 U CN 207946515U
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- mutual inductor
- processing unit
- central processing
- indicator light
- secondary input
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Abstract
The utility model is related to a kind of mutual inductor polarity testers.Including key switch, central processing unit, power supply, indicator light, display screen, switching switch, primary output terminals, secondary input terminal and signal output apparatus and signal processing circuit；Power supply is electrically connected with central processing unit, it is electrically connected with signal output apparatus by switching switch, by central processing unit control signal output, signal output apparatus is connected to primary output terminals, primary output terminals with tested mutual inductor primary side for connecting, and secondary input terminal with tested mutual inductor secondary side for connecting；Secondary input terminal is electrically connected with signal processing circuit, and signal processing circuit is connected to central processing unit；Display screen, indicator light and key switch are electrically connected with central processing unit.After the completion of the utility model wiring, one can complete to test；Built-in rechargeable battery, signal output time is short, and battery working time is long, without more consumption.
Description
Technical field
The utility model is related to the tests of electronic device, and in particular, to a kind of mutual inductor polarity tester.
Background technology
In actual operation, usual secondary wiring has been tied up, and is not easy to directly to line.In the case of existing, for stopping
Mutual inductor under electricity condition generally checks polarity using direct current method, i.e. a people holds dry cell and applies direct current in mutual inductor primary side
The test pencil of voltage, another people multimeter contacts the conducting wire before table, the deflection of general-purpose list index when a people passes through test, judges
Mutual inductor polarity correctness including counting guardian in, needs 4 people to complete test job altogether, meanwhile, in actual field work, also
There is problems with：
1. direct current method needs multiple personnel's cooperations to operate, primary side applies alive personnel and passes through propaganda directed to communicate " conjunction " " dividing "
Indicate state, the personnel for observing throw of pointer combine sound, while according to throw of pointer judging polarity correctness, coordinate
If it is asynchronous, or environment dim by construction site, noisy influenced, it is possible that erroneous judgement.
2.2. for becoming bigger mutual inductor, multimeter throw of pointer is faint, is not easy to judge.
3.3. the deflection of pointer is only in a flash, it is difficult to keep effective state that inspection personnel is supplied to judge.
4.4. live O＆M condition is poor, fragile during pointer multimeter transport and use, carries and takes care of not
Just.
When 5.5. being measured for CT polarity, needs to disconnect second loop return wiring, milliammeter is sealed in, test
Cheng Houzai is accessed, and butted line is needed to be modified, and can not be verified after changing.
6.6. CT polarity chrons are tested, for dry cell often in instantaneous short circuit state, battery is easy to not enough power supply, electricity
Enough electric currents can not be exported when insufficient, it is secondary to observe measurement result.For becoming bigger mutual inductor, general-purpose list index
It deflects faint, is not easy to judge；The deflection of pointer is only in a flash, it is difficult to keep effective state that inspection personnel is supplied to sentence
It is disconnected；Therefore it is possible that erroneous judgement.
Utility model content
The purpose of the utility model is to overcome the deficiencies in the prior art, provide it is a kind of can one man operation mutual inductor polarity
Tester.
To solve the above problems, technical solution provided by the utility model is：A kind of mutual inductor polarity tester, wherein
Including key switch, central processing unit, power supply, indicator light, display screen, switching switch, primary output terminals, secondary input terminal
And signal output apparatus and signal processing circuit；The power supply is electrically connected with central processing unit, by switching switch and letter
The electrical connection of number output circuit, by central processing unit control signal output, signal output apparatus is connected to primary output terminals, once
Leading-out terminal with tested mutual inductor primary side for connecting, and secondary input terminal with tested mutual inductor secondary side for connecting；Institute
The secondary input terminal stated is electrically connected with signal processing circuit, and signal processing circuit is connected to central processing unit；The display
Screen, indicator light and key switch are electrically connected with central processing unit.
In the present invention, working method exports primary to mutual inductor for internal generation transformer test desired signal
Side repeatedly compares according to the secondary side response signal of acquisition and realizes automatic decision, replace existing artificial judgment, ensure result
Accuracy.Secondary circuit is sampled using current clamp when current transformer is tested, and does not have to disconnect secondary circuit.It can be real after the completion of wiring
The break-make and polarity of existing voltage current transformer judge, improve working efficiency；Test result uses LCD display and light-emitting diodes
Pipe indicator light two ways is shown, does not reset unclear division result.
Further, the power supply includes working power, CT power supplys, PT power supplys, CT power supplys and PT power supplys one end with
Working power be electrically connected, the other end with switching switch connection, by control switching switch can between CT power supplys and PT power supplys into
Row switching, selects CT power supplys or PT power supplys as out-put supply；The working power is electrically connected with central processing unit.According to
PT, CT difference generate unlike signal, are exported using electronic circuit control signal waveform.
Preferably, switching switch is multitool throw-over switch.
Further, charged lithium cells are additionally provided with, lithium battery is electrically connected with working power.Built-in rechargeable lithium battery, can
Secondary circuit polarity test for being in mutual inductor when having a power failure.Signal oneself can be generated to be input to mutual inductor to carry out polarity logical
It is disconnected to differentiate, the break-make and polarity of mutual inductor are accurately determined, can be not only used for voltage transformer, it can also be used to current transformer.
Further, the secondary input terminal includes voltage secondary input port and the secondary pincerlike input terminal of electric current
Mouthful, voltage secondary input port includes high-end, the secondary input low side of voltage of the secondary input of voltage.It is used when secondary current inputs
Pincer input, current clamp is clipped on secondary side conducting wire and is tested, and without secondary circuit is disconnected, improves reliability and survey
Try efficiency.
Further, the primary output terminals include once exporting high-end and primary output low side.
Further, the indicator light includes broken string indicator light, same polarity indicator light, reversed polarity indicator light.
Further, the key switch includes reset key and test button.
In the present invention, key circuit is connected to central processing unit and carries out respective handling, and power circuit includes PT electricity
Source, CT power supplys and working power.After switching selects CT or PT tests, it is that output is powered to switch PT power supplys or CT power supplys,
Square-wave signal output is controlled by central processing unit, output signal is connected to primary output terminals, is connected to tested voltage
Or current transformer primary side.Tested mutual inductor secondary side is connected to mutual inductor polarity tester voltage secondary input port or electricity
Flow secondary pincerlike input port, be then connected to signal processing circuit be filtered, shaping, the processing such as amplification, treated signal
It is connected to central processing unit and carries out interpretation of result differentiation, then result liquid crystal display and indicator light are shown.Switching selects CT
Or when PT, not only can Switching power, while can also switch selected secondary input.
Mutual inductor polarity tester is worked using electromagnetic transformer Lenz's law, is pressed after feeler switch by centre
It manages device control and generates certain frequency and the rectangular pulse input mutual inductor primary side of duty ratio, after mutual inductor receives step signal,
After two secondary couplings, rectangular wave is square wave in the waveform of primary side, and the correspondence waveform that secondary side receives is burst pulse, the pulse
Direction it is related with secondary side wiring polarity.Receive after signal inputted by secondary input port, by signal processing circuit into
Row processing, is input in central processing unit, makes break-make, polar judgement, sends 7 pulse signals, retest 3 times every time
Afterwards to finally be differentiated as a result, ensureing the reliability of result.Simultaneously as CT does not allow to open a way for bis- times, traditional test electric current
When need by milliammeter connect access circuit measuring, need open-circuit line to be directly accessed, this mutual inductor polarity tester is secondary
Using pincerlike input when electric current inputs, current clamp is clipped on secondary side conducting wire and is tested, without disconnecting secondary circuit,
Improve reliability and testing efficiency.
Compared with prior art, advantageous effect is：A kind of mutual inductor polarity tester provided by the utility model, wiring are complete
Cheng Hou, one can complete to test；Unlike signal, profit are generated by PT out-put supplies or CT out-put supplies according to the switching of switch
With signal output of electronic circuit control, secondary input passes through signal processing, differentiates after filter and amplification, repeatedly relatively, big to become
Also than mutual inductor result is reliable, and test result, which does not reset, not to be removed.Built-in rechargeable battery, signal output time is short, battery work
Time is long, without more consumption.
Description of the drawings
Fig. 1 is the utility model connection diagram.
Fig. 2 is tester host external structure schematic diagram provided by the utility model.
Specific implementation mode
The attached figures are only used for illustrative purposes and cannot be understood as limitating the patent；It is attached in order to more preferably illustrate the present embodiment
Scheme certain components to have omission, zoom in or out, does not represent the size of actual product；To those skilled in the art,
The omitting of some known structures and their instructions in the attached drawings are understandable.Being given for example only property of position relationship described in attached drawing
Illustrate, should not be understood as the limitation to this patent.
As shown in Fig. 2, this example host external structure includes once exporting high-end 61, primary output low side 62；Secondary electricity
Pressure inputs high-end 711, secondary voltage and inputs low side 712；Secondary current clamps input port 72；Switch switch 8；Liquid crystal display display screen
5；Break indicator light 41, same polarity indicator light 42, reversed polarity indicator light 43, reset key 11, test button 12.
As shown in Figure 1, being the host internal structure chart, key switch 1 includes reset key 11 and test button in Fig. 1
12, key switch 1 is connected to central processing unit 2, and keystroke handling is carried out by central processing unit 2.PT power supplys 32 and CT power supplys 33 connect
It is connected to multitool commutator, multitool commutator is switched to by corresponding option according to tested transformer type, switches output loop
It is connected to signal output apparatus 9, the waveform that signal output apparatus 9 is controlled by central processing unit 2 exports, signal output apparatus 9
It is connected to primary output terminals 6.Primary output terminals 6 include that high-end 61, primary output low side 62 is once exported in Fig. 1, once
Leading-out terminal 6 connects tested voltage or current transformer primary side both ends, and tested voltage or Current Transformer Secondary side connect electricity
Secondary input port or the secondary pincerlike input port of electric current, voltage secondary input port or the secondary pincerlike input port of electric current is pressed to connect
It is connected to multitool commutator, is followed by signal processing circuit 10 through the selection switching of multitool commutator, signal processing circuit 10 will be located
Signal after reason is sent to central processing unit 2, and central processing unit 2 obtains after carrying out analysis and distinguishing to signal as a result, passing through display
Screen 5 and 4 display processing result of indicator light.Wherein lithium battery 34 is powered through working power 31 for entire circuit, through 32 He of PT power supplys
CT power supplys 33 are that an output signal is powered.
When the utility model mutual inductor polarity tester measures：First by switching to voltage transformer or Current Mutual Inductance
Device state, then connect primary output terminals 6, secondary input terminal.It clicks test button 12 to start to test, test is completed
Afterwards the results are shown on display screen 5, while the one of meeting of the indicator light 4 that breaks, same polarity indicator light 4, reversed polarity indicator light 4
Bright, test result, which does not reset, not to be removed, by can be measured after reset key 11 next time.
Obviously, above-described embodiment of the utility model is only intended to clearly illustrate the utility model example, and
It is not the restriction to the embodiment of the utility model.For those of ordinary skill in the art, in above description
On the basis of can also make other variations or changes in different ways.There is no need and unable to give all embodiments
It is exhaustive.All any modification, equivalent and improvement made within the spirit and principle of the present invention etc., should be included in
Within the protection domain of the utility model claims.
Claims (8)
1. a kind of mutual inductor polarity tester, which is characterized in that including key switch（1）, central processing unit（2）, power supply, instruction
Lamp（4）, display screen（5）, switching switch（8）, primary output terminals（6）, secondary input terminal and signal output apparatus（9）With
Signal processing circuit（10）；The power supply and central processing unit（2）Electrical connection is switched by switching（8）Electricity is exported with signal
Road（9）Electrical connection, by central processing unit（2）Control signal output, signal output apparatus（9）It is connected to primary output terminals（6）,
Primary output terminals（6）For being connect with tested mutual inductor primary side, secondary input terminal is used for and tested mutual inductor secondary side
Connection；The secondary input terminal and signal processing circuit（10）Electrical connection, signal processing circuit（10）It is connected to centre
Manage device（2）；The display screen（5）, indicator light（4）And key switch（1）And central processing unit（2）Electrical connection.
2. mutual inductor polarity tester according to claim 1, which is characterized in that the power supply includes working power
（31）, CT power supplys（33）, PT power supplys（32）, CT power supplys（33）With PT power supplys（32）One end is and working power（31）Electrical connection,
The other end is switched with switching（8）Connection, by controlling switching switch（8）It can be in CT power supplys（33）With PT power supplys（32）Between carry out
Switching selects CT power supplys（33）Or PT power supplys（32）As out-put supply；The working power（31）With central processing unit（2）
Electrical connection.
3. mutual inductor polarity tester according to claim 2, which is characterized in that the switching switch（8）For multitool
Throw-over switch.
4. mutual inductor polarity tester according to claim 1, which is characterized in that be additionally provided with charged lithium cells（34）, lithium
Battery（34）With working power（31）Electrical connection.
5. mutual inductor polarity tester according to claim 1, which is characterized in that the secondary input terminal includes electricity
Press secondary input port（71）With the secondary pincerlike input port of electric current（72）, voltage secondary input port（71）It is secondary including voltage
It inputs high-end（711）, the secondary input low side of voltage（712）.
6. mutual inductor polarity tester according to claim 1, which is characterized in that the primary output terminals（6）Packet
Include once export it is high-end（61）With primary output low side（62）.
7. mutual inductor polarity tester according to any one of claims 1 to 6, which is characterized in that the indicator light（4）
Including the indicator light that breaks（41）, same polarity indicator light（42）, reversed polarity indicator light（43）.
8. mutual inductor polarity tester according to claim 7, which is characterized in that the key switch（1）Including multiple
Position button（11）With test button（12）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820439674.5U CN207946515U (en) | 2018-03-29 | 2018-03-29 | Mutual inductor polarity tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820439674.5U CN207946515U (en) | 2018-03-29 | 2018-03-29 | Mutual inductor polarity tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207946515U true CN207946515U (en) | 2018-10-09 |
Family
ID=63697336
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820439674.5U Active CN207946515U (en) | 2018-03-29 | 2018-03-29 | Mutual inductor polarity tester |
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| Country | Link |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108627792A (en) * | 2018-03-29 | 2018-10-09 | 广东电网有限责任公司 | Mutual inductor polarity tester |
| CN112666502A (en) * | 2020-12-03 | 2021-04-16 | 广东电网有限责任公司中山供电局 | Hand-held type CT polarity tester device |
-
2018
- 2018-03-29 CN CN201820439674.5U patent/CN207946515U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108627792A (en) * | 2018-03-29 | 2018-10-09 | 广东电网有限责任公司 | Mutual inductor polarity tester |
| CN112666502A (en) * | 2020-12-03 | 2021-04-16 | 广东电网有限责任公司中山供电局 | Hand-held type CT polarity tester device |
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