CN205691712U - Multi-analog loop polarity tester - Google Patents
Multi-analog loop polarity tester Download PDFInfo
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- CN205691712U CN205691712U CN201620569358.0U CN201620569358U CN205691712U CN 205691712 U CN205691712 U CN 205691712U CN 201620569358 U CN201620569358 U CN 201620569358U CN 205691712 U CN205691712 U CN 205691712U
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Abstract
A kind of multi-analog loop polarity tester, is made up of test main frame and radio extension, it is characterized in that: have host test line on test main frame, radio extension has some extension set p-wires；The host test line of test main frame is connected to input and the outfan of transformer primary winding, each extension set p-wire of radio extension is connected to transformer secondary circuit cable respectively and introduces each coil of measure and control device entrance, connects for wireless signal between radio extension and test main frame.Its advantage is, integrated level is high, easy to carry, simple to operate, only need one man operation, time saving and energy saving during test, check while once can completing multiple wire loop, test, the correctness of the integrity in multi-analog loop, polarity disposably can be completed verification, avoid different personnel's wiring and the error that message context brings is transmitted in contact, ensure the safe operation of power supply unit.
Description
Technical field
This utility model relates to a kind of polarity tester, particularly a kind of multi-analog loop polarity tester, application
In the transformer and distribution station of the various wiring of electric railway, occasion such as local electric power system, industrial enterprise etc..
Background technology
Voltage transformer (PT) summation current transformer (CT) is the electrical equipment that power system is important, and it carries high and low
The function that isolation between pressure system and high pressure amount are changed to low pressure amount.Mutual inductor polarity mistake, easily sends out in equipment runs
The problems such as raw improper tripping operation, measurement amount are inaccurate；Therefore its polarity and the correctness of secondary connection, protection, the survey to system
The normal work of the equipment such as amount, supervision has extremely important meaning.
When newly installed, overhaul PT, CT or replacing PT, CT secondary cable, all kinds of protection, polarity test method is utilized to check
The correctness of PT, CT wiring, has been the requisite working procedure of relay protection staff.
In the anti-test of daily spring, although code does not require to test the polarity of transformer, but transformer insulation resistance
Test period be 1-3, and test Secondary Winding to a winding and ground insulation time, need remove PT, CT secondary lead wires, because of
Its Secondary Winding mostly is 2-4 coil, needs to arouse attention especially when recovering, the most easily causes lead-in wire wrong, therefore exist
In the case of holding the most completely, transformer secondary line has recovered after will from transformer once between secondary measure and control device to time
Road integrity is tested.
In sum, transformer is newly installed, overhaul or when changing transformer secondary cable, all kinds of protection, or daily spring
After anti-test completes, the integrity to multi-analog loop, the correctness of polarity is needed to verify.
And current, scene is used mostly mutual-inductor tester and completes excitation property, ratio and angular difference, the test of polarity, but
The purpose of this test is to confirm transformer bulk properties, the Correctness checking of polarity, for secondary connecting line and voltage, electric current
Phase place between analog quantity coordinates inspection helpless；It addition, a kind of traditional artificial " point-polarity " polarity test method inspection
Testing the correctness of PT, CT wiring, this artificial " point-polarity " polarity test method to be at least equipped with 2 groups of 4 people, and need before testing
To link up in advance, in test in two groups of communication processes must also term accurate, the error of any point is it is possible to cause polarity
Mistake, to equipment run bring immeasurable impact.It is more than the deficiencies in the prior art.
Utility model content
The purpose of this utility model is: providing a kind of multi-analog loop polarity tester, this polarity tester is integrated
Degree height, easy to carry, simple to operate, only need one man operation, time saving and energy saving during test, once can complete the same of multiple wire loop
Time check, test, the correctness of the integrity in multi-analog loop, polarity disposably can be completed verification, it is to avoid difference
The error that personnel's wiring and contact transmission message context bring, has ensured the safe operation of power supply unit.
The purpose of this utility model can be realized by following technical proposals:
This multi-analog loop polarity tester, is made up of test main frame and radio extension, it is characterized in that: test main frame
On have host test line, radio extension has some extension set p-wires；The host test line of test main frame is connected to transformer once
The input of coil and outfan, each extension set p-wire of radio extension is connected to transformer secondary circuit cable respectively and introduces observing and controlling
Each coil at device portal, connects for wireless signal between radio extension and test main frame.
Host test line described in the utility model is by flowing mutual p-wire and pressing mutual p-wire to form, and test current transformer is originally
The concrete polarity chron in body and primary winding thereof extremely each secondary coil loop, the mutual p-wire of stream of test main frame is connected to Current Mutual Inductance
The input of device primary winding and outfan, each extension set p-wire of radio extension is connected to secondary loop of mutual inductor electricity respectively
Cable introduces each coil of measure and control device porch；Test voltage transformer body and primary winding to each secondary coil thereof return
The concrete polarity chron on road, the mutual p-wire of pressing of test main frame is connected to input and the outfan of voltage transformer primary winding, nothing
Each extension set p-wire of line extension set is connected to Secondary Circuit of Potential Transformer cable respectively and introduces each line of measure and control device porch
Circle.
Test main frame described in the utility model is mainly by main frame MCU system, host power supply, transformer discharge circuit, main frame
Wireless transmission circuit and liquid crystal display composition, main frame MCU system is for realizing the test control of current transformer, voltage transformer
System, and be analyzed calculating to the data that radio extension transmission is next, determine the positive and negative polarity of current transformer, voltage transformer,
And error message is got rid of；Host power supply is for providing 12V DC voltage 12V+, 5V unidirectional current for test host computer system
Pressure 5V+, 3.3V DC voltage VCC3.3 and 12V DC voltage 12vl；Transformer discharge circuit is for realizing current transformer
Primary winding discharge, voltage transformer primary winding is charged, and when electric current reaches some levels, automatically disconnects
Charge circuit；Main frame wireless transmission circuit is for realizing the wireless telecommunications between test main frame and radio extension；Liquid crystal display is used
In display current transformer, the test result of voltage transformer；Described radio extension mainly by extension set MCU system, Exgt Bat extension battery,
Sampling hold circuit, polarity display circuit and extension set wireless transmission circuit composition, extension set MCU system is used for controlling wireless receiving and dispatching mould
The transmitting-receiving of block, gathers the actuating signal of sampling hold circuit, forms data and is sent to test main frame；Exgt Bat extension battery is for for wireless
Subordinate machine system provide 12V DC voltage 12vl and 3.3V DC voltage VCC, and for radio extension system provide ground connection tapping block and
Power supply indicator binding post；Sampling hold circuit is for gathering the pulse signal of transformer secondary coil loop generation and protecting
Hold, gather for extension set MCU system, and form data；Polarity display circuit for indicating the adding of institute survey time road, subtractive polarity, with
Shi Zuowei auxiliary display is compared with test main frame, to guarantee the accuracy of test result；Extension set wireless transmission circuit is used for realizing
Wireless telecommunications between radio extension and test main frame.
Embedded microcontroller U1, main frame crystal oscillating circuit and host reset is had in main frame MCU system described in the utility model
Circuit, has crystal oscillator Y1 and electric capacity C1 and C2, has reset resistor Rfw and terminals in host reset circuit in main frame crystal oscillating circuit
Sub-FW；Tapping block CON1, CON2, CON3 and CON8 is had in host power supply；Have in transformer discharge circuit tapping block CON6 and
CON7, resistance R3～R6, CT discharge loop and PT discharge loop, have relay K 1, tapping block CON4, have in CT discharge loop
Polar capacitor C3, diode D1, audion Q1 and resistance R1, have relay K 2, tapping block CON5, diode in PT discharge loop
D2, audion Q2 and resistance R2；Radio receiving transmitting module interface J2 is had in main frame wireless transmission circuit；Liquid crystal is had in liquid crystal display
Show device interface J1；Embedded microcontroller U12, extension set crystal oscillating circuit, extension set reset circuit, relay is had in extension set MCU system
K12, diode D12, audion Q12 and resistance R0, have crystal oscillator Y12 and electric capacity C12 and C22, extension set in extension set crystal oscillating circuit
Reset resistor Rfw2 and binding post FW2 is had in reset circuit；Tapping block TS3.3V, TS12V, TS-GND1 is had in Exgt Bat extension battery
With TS-GND2, binding post J-LED and resistance Rled；Relay K 10 and K3～K9, diode is had in sampling hold circuit
D10, D3～D9, D21, D31, D41, D51, D61, D71, D81, D91, D22, D32, D42, D52, D62, D72, D82 and D92,
Audion Q10 and Q3～Q9, adjustable resistance R21, R31, R41, R51, R61, R71, R81 and R91 and tapping block TS1, TS2,
TS3 and TS4；Just resistance R22, R32, R42, R52, R62, R72, R82 and R92 and LED light is had in polarity display circuit
Pole binding post LED+；Radio receiving transmitting module interface J22 is had in extension set wireless transmission circuit；
Its circuit connecting relation is: in test main frame, the binding post FW of main frame MCU system is connected to reset key；?
In host power supply, the 1st and the 2nd pin of tapping block CON1 connects 12V DC voltage 12V+ and ground, the of tapping block CON2 respectively
1 and the 2nd pin connects 5V DC voltage 5V+ and ground respectively, and the 1st and the 2nd pin of tapping block CON3 connects 3.3V direct current respectively
Voltage VCC3.3 and ground, the 1st and the 2nd pin of tapping block CON8 connects 12V DC voltage 12vl and ground respectively；Put at transformer
In electricity circuit, the 1st pin of tapping block CON6 connects one end of resistance R3 and R4, and it is straight that the 2nd pin of tapping block CON6 connects 5V
The other end ground connection of stream voltage 5V+, resistance R4, the 1st pin of tapping block CON7 connects one end of resistance R5 and R6, tapping block
2nd pin of CON7 connects the other end ground connection of 5V DC voltage 5V+, resistance R6, tapping block CON6 is connected to flow mutually/press be mutually measured
Examination selection key, tapping block CON7 is connected to start/confirm button, in CT discharge loop, and the normally opened contact of relay K 1 switch
Connect the 1st pin and the 12V DC voltage 12V+ of tapping block CON4 respectively with normally-closed contact, the common port of relay K 1 switch is even
It is connected to the positive pole of polar capacitor C3, the 2nd pin of tapping block CON4 and the equal ground connection of negative pole of polarized electric capacity C3, relay K 1 line
The two ends of circle connect positive pole and the negative pole of diode D1 respectively, and the negative pole of diode D1 connects 12V DC voltage 12V+, diode
The colelctor electrode of the positive pole connecting triode Q1 of D1, the grounded emitter of audion Q1, the base stage of audion Q1 connects resistance R1's
One end, tapping block CON4 is connected to flow mutual p-wire, and in PT discharge loop, the normally opened contact of relay K 2 switch connects tapping block
1st pin of CON5, the common port of relay K 2 switch connects 12V DC voltage 12vl, and the 2nd pin of tapping block CON5 connects
Ground, the two ends of relay K 2 coil connect positive pole and the negative pole of diode D2 respectively, and the negative pole of diode D2 connects 12V unidirectional current
The colelctor electrode of the positive pole connecting triode Q2 of pressure 12V+, diode D2, the grounded emitter of audion Q2, the base stage of audion Q2
Connect one end of resistance R2, tapping block CON5 is connected to press mutual p-wire；Between main frame MCU system and transformer discharge circuit,
The other end of resistance R3 is connected to the 21st pin of embedded microcontroller U1, and the other end of resistance R5 is connected to embedded micro-control
22nd pin of device U1 processed, the resistance R1 other end of CT discharge loop is connected to the 19th pin of embedded microcontroller U1, PT
The resistance R2 other end of discharge loop is connected to the 20th pin of embedded microcontroller U1；Main frame MCU system is wireless with main frame
Between transmission circuit, the 3rd～the 8th pin of radio receiving transmitting module interface J2 is connected respectively to the of embedded microcontroller U1
17, the 16th, the 24th, the 18th, the 15th and the 23rd pin, equipped with radio receiving transmitting module on radio receiving transmitting module interface J2；Main frame MCU
Between system and liquid crystal display, the 5th～the 14th pin of liquid crystal display interface J1 is connected respectively to embedded microcontroller U1
The the 33rd～the 40th, the 2nd and the 3rd pin, equipped with liquid crystal display on liquid crystal display interface J1；
In radio extension, in Exgt Bat extension battery, the 1st and the 2nd pin of tapping block TS3.3V connects 3.3V unidirectional current respectively
Pressure VCC and ground, the 1st and the 2nd pin of tapping block TS12V connects 12V DC voltage 12vl and ground, tapping block TS-GND1 respectively
The the 1st and the 2nd pin and the 1st and the 2nd equal ground connection of pin of tapping block TS-GND2, the 1st pin of binding post J-LED is even
One end of connecting resistance Rled, the other end of resistance Rled connects 12V DC voltage 12vl, and the 2nd pin of binding post J-LED connects
Ground, binding post J-LED is connected to LED light；In extension set MCU system, binding post FW2 is connected to reset key, continues
The common port of electrical equipment K12 switch connects the negative pole of diode D12, and the normally opened contact of relay K 12 switch draws 12V DC voltage
12V+, the two ends of relay K 12 coil connect positive pole and the negative pole of diode D12 respectively, and the negative pole of diode D12 connects 12V
The colelctor electrode of the positive pole connecting triode Q12 of DC voltage 12vl, diode D12, the grounded emitter of audion Q12, three poles
The base stage of pipe Q12 connects one end of resistance R0, and the other end of resistance R0 is connected to the 19th pin of embedded microcontroller U12；
In sampling hold circuit, the common port of relay K 10 and K3～K9 switch is all connected with 12V DC voltage 12V+, relay K 10
Negative pole with the normally-closed contact of K3～K9 switch connects diode D31, D21, D51, D41, D71, D61, D91 and D81 respectively, continues
The normally opened contact of electrical equipment K10 and K3～K9 switch connects adjustable resistance R21, R31, R41, R51, R61, R71, R81 and R91 respectively
A fixing end, another of adjustable resistance R21, R31, R41, R51, R61, R71, R81 and R91 is fixing holds equal ground connection, continues
The two ends of electrical equipment K10 and K3～K9 coil connect the negative of diode D21, D31, D41, D51, D61, D71, D81 and D91 respectively
Pole, positive pole, the positive pole of diode D21, D31, D41, D51, D61, D71, D81 and D91 be connected respectively to audion Q10 and Q3～
The colelctor electrode of Q9, the base stage of audion Q10 and Q3～Q9 connects the negative pole of diode D10 and D3～D9 respectively, audion Q10 and
The emitter stage of Q3～Q9 connects the positive pole of diode D22, D32, D42, D52, D62, D72, D82 and D92 respectively, and all connects simultaneously
Ground, the positive pole of diode D10 and D3～D9 connects the 2nd pin of tapping block TS1, the 1st pin of tapping block TS1, separated time respectively
Seat the 2nd pin of TS2, the 1st pin of tapping block TS2, the 2nd pin of tapping block TS3, the 1st pin of tapping block TS3, separated time
2nd pin of seat TS4 and the 1st pin of tapping block TS4, diode D22, D32, D42, D52, D62, D72, D82 and D92's is negative
Pole connects the positive pole of diode D3, D10, D5, D4, D7, D6, D9 and D8 respectively, each company on tapping block TS1, TS2, TS3 and TS4
It is connected to an extension set p-wire；In polarity display circuit, one end of resistance R22, R32, R42, R52, R62, R72, R82 and R92
It is connected respectively to the 1st～the 8th pin of LED light positive terminal LED+, LED light positive terminal LED+'s
1st～the 8th pin connects the positive pole of 8 LED lights respectively, and the negative pole of 8 LED lights interconnects and is followed by
Ground；Between extension set MCU system and sampling hold circuit, the cunning of adjustable resistance R21, R31, R41, R51, R61, R71, R81 and R91
Moving contact end is connected respectively to the 33rd～the 40th pin of embedded microcontroller U12；Sampling hold circuit and polarity display electricity
Between road, the fixing end of adjustable resistance R21, R31, R41, R51, R61, R71, R81 and R91 mono-connect respectively resistance R22, R32,
The other end of R42, R52, R62, R72, R82 and R92；Between extension set MCU system and extension set wireless transmission circuit, wireless receiving and dispatching mould
3rd～the 8th pin of block interface J22 is connected respectively to the 17th of embedded microcontroller U12 the, the 16th, the 24th, the 18th, the 15th
With the 23rd pin, equipped with radio receiving transmitting module on radio receiving transmitting module interface J22.
In main frame MCU system of the present utility model, the model of its embedded microcontroller U1 is PIC16F877A-I/P；Mutually
In sensor discharge circuit, the model of its diode D1 is IN4001, and the model of audion Q1 is 2N3904, the model of diode D2
For IN4001, the model of audion Q2 is 2N3904；In extension set MCU system, the model of its embedded microcontroller U12 is
PIC16F877A-I/P 。
Radio receiving transmitting module interface J2 in this utility model main frame wireless transmission circuit, and extension set wireless transmission circuit
In radio receiving transmitting module interface J22 on equipped with radio receiving transmitting module, be Monolithic RF transceiver chip, its model is
nRF24L01+ 。
The utility model has the advantages that: 1) this multi-analog loop polarity tester integrated level is high, test main frame, wireless
Each component is enclosed within a chest the least by extension set, easy to carry, simple to operate, only need during test one man operation,
Time saving and energy saving, check while once can completing multiple wire loop, test (and can need to expand according to scene), can be to multichannel
The integrity in analog quantity loop, the correctness of polarity disposably complete verification, it is to avoid different personnel's wiring and contact transmission side
The error worn, has ensured the safe operation of power supply unit；2) test main frame, radio extension use distance wireless anti-interference
Transmission technology, maximum transmission distance 1000m；Radio extension can meet the mutual inductance of any position of Traction Substation of Electric Railway
The needs of device loop-around test, and eliminate high voltage interference, tractive power supply system higher hamonic wave and the shadow refluxed significantly completely
Ring, stable；3) according to the structure that CT, PT are different, take electric capacity electric discharge, the scheme of directly charging respectively, both extended electricity
Service life of source battery, also ensure that the value of remote signaling；In addition to can completing the inspection of PT, CT body polarity, for there being pole
The property differential protection of input requirements, impedance protection and measurement meter, from high-tension once to the secondary lead wires loop of low-voltage
Also can disposably complete inspection, it is ensured that whole youngster's loop polarity correct and connect reliable, ensure that transformer is protected after putting into operation
The selectivity of action and the accuracy of metering；4) provide instrument Redundancy Design, make test process not affected by instrument failure,
In the case of check meter wireless transceiver system fault, can be indicated by LED in indoor observation radio extension polarity display circuit
The LED light luminescence situation connected on lamp positive terminal LED+ determines the polarity of each test loop；At test main frame
In the case of fault, also can receive signal with aneroid battery at transformer primary side dosage, radio extension end, still can be seen by indoor
Examine the LED light luminescence situation connected on LED light positive terminal LED+ in radio extension polarity display circuit true
The polarity of each test loop fixed, can never affect test jobs because of the fault of instrument.
Accompanying drawing explanation
Fig. 1 is use principle block diagram of the present utility model；
Fig. 2 is the use principle block diagram of test current transformer；
Fig. 3 is test host circuit block diagram；
Fig. 4 is radio extension circuit block diagram；
Fig. 5 is test host circuit schematic diagram；
Fig. 6 is radio extension circuit theory diagrams.
Detailed description of the invention
As shown in figures 1 to 6, this multi-analog loop polarity tester, it is made up of test main frame and radio extension, it is special
Levy and be: have host test line on test main frame, radio extension has some extension set p-wires；The host test line of test main frame connects
Input (polarity) in transformer primary winding is held and exports (nonpolar) end, and each extension set p-wire of radio extension is connected to respectively
Transformer secondary circuit cable introduces each coil of measure and control device porch, is wireless communication between radio extension and test main frame
Number connect.Test main frame is for after pressing feeler switch thereon (that is, starting/confirm button), to transformer primary winding
While side applies voltage, send command signal and require radio extension feedback test value, then radio extension is sent the survey of coming
Examination value carries out computational analysis and determines the concrete polarity in transformer body and primary winding thereof extremely each secondary coil loop；Wireless point
Machine, for carrying out sampling analysis at transformer each secondary coil circuit end, determines its output polarity, thus obtains test value,
And by the way of being wirelessly transferred, test value is sent to test main frame.
As shown in Figure 1, 2, described host test line is by flowing mutual p-wire (that is, current transformer p-wire) and pressure test mutually
Line (that is, voltage transformer p-wire) forms, and test current transformer body and primary winding thereof are to each secondary coil loop
Concrete polarity chron, test main frame the mutual p-wire of stream (that is, current transformer p-wire) be connected to current transformer primary winding
Input (polarity) hold and export (nonpolar) end, each extension set p-wire of radio extension is connected to Current Transformer Secondary respectively and returns
Road cable introduces each coil of measure and control device porch；Test voltage transformer body and primary winding thereof are to each secondary line
The concrete polarity chron in circle loop, the mutual p-wire of pressure (that is, voltage transformer p-wire) of test main frame is connected to voltage transformer one
The input (polarity) of secondary coil is held and exports (nonpolar) end, and each extension set p-wire of radio extension is connected to voltage transformer respectively
Secondary circuit cable introduces each coil of measure and control device porch.
As shown in figures 1 to 6, described test main frame mainly by main frame MCU system 1, host power supply 2, transformer discharge circuit 3,
Main frame wireless transmission circuit 4 and liquid crystal display 5 form, and main frame MCU system 1 is for realizing current transformer, voltage transformer
Testing and control, and to radio extension send come data be analyzed calculate, determine current transformer, voltage transformer just,
Negative polarity, and error message is got rid of；Host power supply 2 for for test host computer system provide 12V DC voltage 12V+,
5V DC voltage 5V+, 3.3V DC voltage VCC3.3 and 12V DC voltage 12vl；Transformer discharge circuit 3 is for realizing electricity
The primary winding of current transformer discharges, and charges voltage transformer primary winding, and when electric current reaches some levels,
Automatically charge circuit is disconnected；Main frame wireless transmission circuit 4 is for realizing the wireless telecommunications between test main frame and radio extension；Liquid
Brilliant display 5 is for showing the test result of current transformer, voltage transformer；Described radio extension is mainly by extension set MCU system
6, Exgt Bat extension battery 7, sampling hold circuit 8, polarity display circuit 9 and extension set wireless transmission circuit 10 form, extension set MCU system 6
For controlling the transmitting-receiving of radio receiving transmitting module, gather the actuating signal of sampling hold circuit 8, form data and be sent to test master
Machine；Exgt Bat extension battery 7 is for providing 12V DC voltage 12vl and 3.3V DC voltage VCC for radio extension system, and is wireless point
Machine system provides ground connection tapping block and power supply indicator binding post；Sampling hold circuit 8 is used for gathering transformer secondary coil
Loop produce pulse signal and keep, gather for extension set MCU system 6, and form data；Polarity display circuit 9 is used for referring to
Show the adding of institute survey time road, subtractive polarity, compare, to guarantee the accuracy of test result with testing main frame simultaneously as auxiliary display；
Extension set wireless transmission circuit 10 is for realizing the wireless telecommunications between radio extension and test main frame.
As seen in figures 3-6, there are embedded microcontroller U1, main frame crystal oscillating circuit and main frame multiple in described main frame MCU system 1
Position circuit, has crystal oscillator Y1 and electric capacity C1 and C2, has reset resistor Rfw and wiring in host reset circuit in main frame crystal oscillating circuit
Terminal FW；Tapping block CON1, CON2, CON3 and CON8 is had in host power supply 2；Tapping block CON6 is had in transformer discharge circuit 3
With CON7, resistance R3～R6, CT discharge loop and PT discharge loop, have in CT discharge loop relay K 1, tapping block CON4,
Polarized electric capacity C3, diode D1, audion Q1 and resistance R1, have relay K 2, tapping block CON5, two poles in PT discharge loop
Pipe D2, audion Q2 and resistance R2；Radio receiving transmitting module interface J2 is had in main frame wireless transmission circuit 4；Liquid is had in liquid crystal display 5
Crystal display interface J1；There are embedded microcontroller U12, extension set crystal oscillating circuit, extension set reset circuit in extension set MCU system 6, continue
Electrical equipment K12, diode D12, audion Q12 and resistance R0, have crystal oscillator Y12 and electric capacity C12 and C22 in extension set crystal oscillating circuit,
Reset resistor Rfw2 and binding post FW2 is had in extension set reset circuit；Tapping block TS3.3V, TS12V, TS-is had in Exgt Bat extension battery 7
GND1 and TS-GND2, binding post J-LED and resistance Rled；Relay K 10 and K3～K9, two is had in sampling hold circuit 8
Pole pipe D10, D3～D9, D21, D31, D41, D51, D61, D71, D81, D91, D22, D32, D42, D52, D62, D72, D82 and
D92, audion Q10 and Q3～Q9, adjustable resistance R21, R31, R41, R51, R61, R71, R81 and R91 and tapping block TS1,
TS2, TS3 and TS4；Resistance R22, R32, R42, R52, R62, R72, R82 and R92 and LED is had to refer in polarity display circuit 9
Show lamp positive terminal LED+；Radio receiving transmitting module interface J22 is had in extension set wireless transmission circuit 10；
Its circuit connecting relation is: in test main frame, the binding post FW of main frame MCU system 1 is connected to reset key；?
In host power supply 2, the 1st and the 2nd pin of tapping block CON1 connects 12V DC voltage 12V+ and ground respectively, tapping block CON2's
1st and the 2nd pin connects 5V DC voltage 5V+ and ground respectively, and it is straight that the 1st and the 2nd pin of tapping block CON3 connects 3.3V respectively
Stream voltage VCC3.3 and ground, the 1st and the 2nd pin of tapping block CON8 connects 12V DC voltage 12vl and ground respectively；At transformer
In discharge circuit 3, the 1st pin of tapping block CON6 connects one end of resistance R3 and R4, and the 2nd pin of tapping block CON6 connects 5V
The other end ground connection of DC voltage 5V+, resistance R4, the 1st pin of tapping block CON7 connects one end of resistance R5 and R6, tapping block
2nd pin of CON7 connects the other end ground connection of 5V DC voltage 5V+, resistance R6, tapping block CON6 is connected to flow mutually/press be mutually measured
Examination selection key (that is, current transformer/voltage transformer test selection key), tapping block CON7 is connected to start/confirm by
Key, in CT discharge loop (that is, current transformer discharge circuit), the normally opened contact of relay K 1 switch and normally-closed contact are respectively
Connecting the 1st pin and the 12V DC voltage 12V+ of tapping block CON4, the common port of relay K 1 switch connects polarized electric capacity C3
Positive pole, the 2nd pin of tapping block CON4 and the equal ground connection of negative pole of polarized electric capacity C3, the two ends of relay K 1 coil connect respectively
Connecing positive pole and the negative pole of diode D1, the negative pole of diode D1 connects the positive pole of 12V DC voltage 12V+, diode D1 and connects three
The colelctor electrode of pole pipe Q1, the grounded emitter of audion Q1, the base stage of audion Q1 connects one end of resistance R1, tapping block CON4
On be connected to flow mutual p-wire (that is, current transformer p-wire), in PT discharge loop (that is, voltage transformer discharge circuit), continue
The normally opened contact of electrical equipment K2 switch connects the 1st pin of tapping block CON5, and the common port of relay K 2 switch connects 12V unidirectional current
The 2nd pin ground connection of pressure 12vl, tapping block CON5, the two ends of relay K 2 coil connect the positive pole of diode D2 respectively and bear
Pole, the negative pole of diode D2 connects the colelctor electrode of the positive pole connecting triode Q2 of 12V DC voltage 12V+, diode D2, three poles
The grounded emitter of pipe Q2, the base stage of audion Q2 connects one end of resistance R2, tapping block CON5 is connected to press mutual p-wire
(that is, voltage transformer p-wire)；Between main frame MCU system 1 and transformer discharge circuit 3, the other end of resistance R3 is connected to
21st pin of embedded microcontroller U1, the other end of resistance R5 is connected to the 22nd pin of embedded microcontroller U1, CT
The resistance R1 other end of discharge loop is connected to the 19th pin of embedded microcontroller U1, the resistance R2 of PT discharge loop another
End is connected to the 20th pin of embedded microcontroller U1；Between main frame MCU system 1 and main frame wireless transmission circuit 4, wireless receipts
The the 3rd～the 8th pin sending out module interface J2 is connected respectively to the 17th of embedded microcontroller U1 the, the 16th, the 24th, the 18th, the
15 and the 23rd pin, equipped with radio receiving transmitting module on radio receiving transmitting module interface J2；Main frame MCU system 1 and liquid crystal display 5 it
Between, the 5th～the 14th pin of liquid crystal display interface J1 is connected respectively to the 33rd～the 40th, the 2nd of embedded microcontroller U1
With the 3rd pin, equipped with liquid crystal display on liquid crystal display interface J1；
In radio extension, in Exgt Bat extension battery 7, the 1st and the 2nd pin of tapping block TS3.3V connects 3.3V unidirectional current respectively
Pressure VCC and ground, the 1st and the 2nd pin of tapping block TS12V connects 12V DC voltage 12vl and ground, tapping block TS-GND1 respectively
The the 1st and the 2nd pin and the 1st and the 2nd equal ground connection of pin of tapping block TS-GND2, the 1st pin of binding post J-LED is even
One end of connecting resistance Rled, the other end of resistance Rled connects 12V DC voltage 12vl, and the 2nd pin of binding post J-LED connects
Ground, binding post J-LED is connected to LED light；In extension set MCU system 6, binding post FW2 is connected to reset key, continues
The common port of electrical equipment K12 switch connects the negative pole of diode D12, and the normally opened contact of relay K 12 switch draws 12V DC voltage
12V+, the two ends of relay K 12 coil connect positive pole and the negative pole of diode D12 respectively, and the negative pole of diode D12 connects 12V
The colelctor electrode of the positive pole connecting triode Q12 of DC voltage 12vl, diode D12, the grounded emitter of audion Q12, three poles
The base stage of pipe Q12 connects one end of resistance R0, and the other end of resistance R0 is connected to the 19th pin of embedded microcontroller U12；
In sampling hold circuit 8, the common port of relay K 10 and K3～K9 switch is all connected with 12V DC voltage 12V+, relay
The normally-closed contact of K10 and K3～K9 switch connects the negative of diode D31, D21, D51, D41, D71, D61, D91 and D81 respectively
Pole, the normally opened contact of relay K 10 and K3～K9 switch connects adjustable resistance R21, R31, R41, R51, R61, R71, R81 respectively
The fixing end with one of R91, another fixing end of adjustable resistance R21, R31, R41, R51, R61, R71, R81 and R91 all connects
Ground, the two ends of relay K 10 and K3～K9 coil connect diode D21, D31, D41, D51, D61, D71, D81 and D91 respectively
Negative pole, positive pole, the positive pole of diode D21, D31, D41, D51, D61, D71, D81 and D91 be connected respectively to audion Q10 and
The colelctor electrode of Q3～Q9, the base stage of audion Q10 and Q3～Q9 connects the negative pole of diode D10 and D3～D9, audion respectively
The emitter stage of Q10 and Q3～Q9 connects the positive pole of diode D22, D32, D42, D52, D62, D72, D82 and D92 respectively, and same
Time equal ground connection, the positive pole of diode D10 and D3～D9 connects the 2nd pin of tapping block TS1 respectively, the 1st of tapping block TS1 the draws
Foot, the 2nd pin of tapping block TS2, the 1st pin of tapping block TS2, the 2nd pin of tapping block TS3, the 1st of tapping block TS3 the draw
Foot, the 2nd pin of tapping block TS4 and the 1st pin of tapping block TS4, diode D22, D32, D42, D52, D62, D72, D82 and
The negative pole of D92 connects the positive pole of diode D3, D10, D5, D4, D7, D6, D9 and D8, tapping block TS1, TS2, TS3 and TS4 respectively
Upper each connection has an extension set p-wire；In polarity display circuit 9, resistance R22, R32, R42, R52, R62, R72, R82 and R92
One end be connected respectively to the 1st～the 8th pin of LED light positive terminal LED+, LED light positive terminal
1st～the 8th pin of LED+ connects the positive pole of 8 LED lights respectively, and the negative pole of 8 LED lights interconnects
Rear ground connection；Between extension set MCU system 6 and sampling hold circuit 8, adjustable resistance R21, R31, R41, R51, R61, R71, R81 and
The slider end of R91 is connected respectively to the 33rd～the 40th pin of embedded microcontroller U12；Sampling hold circuit 8 and pole
Between property display circuit 9, mono-fixing end of adjustable resistance R21, R31, R41, R51, R61, R71, R81 and R91 connects electricity respectively
The other end of resistance R22, R32, R42, R52, R62, R72, R82 and R92；Extension set MCU system 6 and extension set wireless transmission circuit 10 it
Between, the 3rd～the 8th pin of radio receiving transmitting module interface J22 is connected respectively to the 17th of embedded microcontroller U12 the, the 16th,
24, the 18th, the 15th and the 23rd pin, equipped with radio receiving transmitting module on radio receiving transmitting module interface J22.
As shown in Figure 5,6, in main frame MCU system 1, the model of its embedded microcontroller U1 is PIC16F877A-I/P；
In transformer discharge circuit 3, the model of its diode D1 is IN4001, and the model of audion Q1 is 2N3904, diode D2's
Model is IN4001, and the model of audion Q2 is 2N3904；In extension set MCU system 6, the model of its embedded microcontroller U12
For PIC16F877A-I/P.Radio receiving transmitting module interface J2 in main frame wireless transmission circuit 4, and extension set is wirelessly transferred electricity
On radio receiving transmitting module interface J22 in road 10 equipped with radio receiving transmitting module, be Monolithic RF transceiver chip, its model
It is nRF24L01+.
This multi-analog loop polarity tester, the 12V DC voltage in host power supply 2, Exgt Bat extension battery 7 is by charging
Battery provides, and rechargeable battery can be selected for lithium battery.In Exgt Bat extension battery 7, the LED light that binding post J-LED is connected to is electricity
Source display lamp, is used to refer to the break-make of radio extension power supply；In polarity display circuit 9, LED light positive terminal LED+
8 LED lights of upper connection are polarity display lamp, are used to refer to the polarity of four wire loops of transformer.
Claims (6)
1. a multi-analog loop polarity tester, is made up of test main frame and radio extension, it is characterized in that: test main frame
On have host test line, radio extension has some extension set p-wires；The host test line of test main frame is connected to transformer once
The input of coil and outfan, each extension set p-wire of radio extension is connected to transformer secondary circuit cable respectively and introduces observing and controlling
Each coil at device portal, connects for wireless signal between radio extension and test main frame.
A kind of multi-analog loop polarity tester the most according to claim 1, is characterized in that: described host test line
By flowing mutual p-wire and pressing mutual p-wire to form, test current transformer body and primary winding thereof are to each secondary coil loop
Concrete polarity chron, the mutual p-wire that flows of test main frame is connected to input and the outfan of current transformer primary winding, wireless
Each extension set p-wire of extension set is connected to secondary loop of mutual inductor cable respectively and introduces each coil of measure and control device porch；
The concrete polarity chron in test voltage transformer body and primary winding thereof extremely each secondary coil loop, the pressure of test main frame is mutually measured
Examination line is connected to input and the outfan of voltage transformer primary winding, and each extension set p-wire of radio extension is connected to voltage respectively
Transformer secondary circuit cable introduces each coil of measure and control device porch.
A kind of multi-analog loop polarity tester the most according to claim 1 and 2, is characterized in that: described test is main
Owner will be by main frame MCU system (1), host power supply (2), transformer discharge circuit (3), main frame wireless transmission circuit (4) and liquid
Brilliant display (5) composition, main frame MCU system (1) is used for realizing the testing and control of current transformer, voltage transformer, and to wireless
Extension set sends the data come and is analyzed calculating, and determines the positive and negative polarity of current transformer, voltage transformer, and to mistake
Information is got rid of；Host power supply (2) for for test host computer system provide 12V DC voltage 12V+, 5V DC voltage 5V+,
3.3V DC voltage VCC3.3 and 12V DC voltage 12vl；Transformer discharge circuit (3) is for realizing to current transformer
Secondary coil discharges, and charges voltage transformer primary winding, and when electric current reaches some levels, automatically disconnects charging
Loop；Main frame wireless transmission circuit (4) is for realizing the wireless telecommunications between test main frame and radio extension；Liquid crystal display (5)
For showing the test result of current transformer, voltage transformer；Described radio extension is mainly by extension set MCU system (6), extension set
Power supply (7), sampling hold circuit (8), polarity display circuit (9) and extension set wireless transmission circuit (10) composition, extension set MCU system
(6) for controlling the transmitting-receiving of radio receiving transmitting module, gather the actuating signal of sampling hold circuit (8), form data and be sent to survey
Examination main frame；Exgt Bat extension battery (7) is for providing 12V DC voltage 12vl and 3.3V DC voltage VCC for radio extension system, and is
Radio extension system provides ground connection tapping block and power supply indicator binding post；Sampling hold circuit (8) is used for gathering transformer
Pulse signal that secondary coil loop produces also keeps, and gathers for extension set MCU system (6), and forms data；Polarity display electricity
Road (9), for indicating the adding of institute survey time road, subtractive polarity, is compared with test main frame simultaneously as auxiliary display, to guarantee that test is tied
The accuracy of fruit；Extension set wireless transmission circuit (10) is for realizing the wireless telecommunications between radio extension and test main frame.
A kind of multi-analog loop polarity tester the most according to claim 3, is characterized in that: described main frame MCU system
System (1) in have embedded microcontroller U1, main frame crystal oscillating circuit and host reset circuit, have in main frame crystal oscillating circuit crystal oscillator Y1 with
And electric capacity C1 and C2, there are reset resistor Rfw and binding post FW in host reset circuit；Host power supply has tapping block in (2)
CON1, CON2, CON3 and CON8；Tapping block CON6 and CON7, resistance R3～R6, CT electric discharge is had in transformer discharge circuit (3)
Loop and PT discharge loop, have in CT discharge loop relay K 1, tapping block CON4, polarized electric capacity C3, diode D1, three
Pole pipe Q1 and resistance R1, has relay K 2, tapping block CON5, diode D2, audion Q2 and resistance R2 in PT discharge loop；Main
Radio receiving transmitting module interface J2 is had in machine wireless transmission circuit (4)；Liquid crystal display has liquid crystal display interface J1 in (5)；Extension set
Embedded microcontroller U12, extension set crystal oscillating circuit, extension set reset circuit, relay K 12, diode is had in MCU system (6)
D12, audion Q12 and resistance R0, have crystal oscillator Y12 and electric capacity C12 and C22, in extension set reset circuit in extension set crystal oscillating circuit
There are reset resistor Rfw2 and binding post FW2；Exgt Bat extension battery has tapping block TS3.3V, TS12V, TS-GND1 and TS-in (7)
GND2, binding post J-LED and resistance Rled；Relay K 10 and K3～K9, diode is had in sampling hold circuit (8)
D10, D3～D9, D21, D31, D41, D51, D61, D71, D81, D91, D22, D32, D42, D52, D62, D72, D82 and D92,
Audion Q10 and Q3～Q9, adjustable resistance R21, R31, R41, R51, R61, R71, R81 and R91 and tapping block TS1, TS2,
TS3 and TS4；Resistance R22, R32, R42, R52, R62, R72, R82 and R92 and LED instruction is had in polarity display circuit (9)
Lamp positive terminal LED+；Radio receiving transmitting module interface J22 is had in extension set wireless transmission circuit (10)；
Its circuit connecting relation is: in test main frame, the binding post FW of main frame MCU system (1) is connected to reset key；Leading
In electromechanical source (2), the 1st and the 2nd pin of tapping block CON1 connects 12V DC voltage 12V+ and ground respectively, tapping block CON2's
1st and the 2nd pin connects 5V DC voltage 5V+ and ground respectively, and it is straight that the 1st and the 2nd pin of tapping block CON3 connects 3.3V respectively
Stream voltage VCC3.3 and ground, the 1st and the 2nd pin of tapping block CON8 connects 12V DC voltage 12vl and ground respectively；At transformer
In discharge circuit (3), the 1st pin of tapping block CON6 connects one end of resistance R3 and R4, and the 2nd pin of tapping block CON6 connects
The other end ground connection of 5V DC voltage 5V+, resistance R4, the 1st pin of tapping block CON7 connects one end of resistance R5 and R6, separated time
2nd pin of seat CON7 connects the other end ground connection of 5V DC voltage 5V+, resistance R6, tapping block CON6 is connected to flow mutually/press mutually
Test selection key, tapping block CON7 is connected to start/confirm button, and in CT discharge loop, the normally opened of relay K 1 switch touches
Point and normally-closed contact connect the 1st pin and the 12V DC voltage 12V+ of tapping block CON4, the common port of relay K 1 switch respectively
Connect the positive pole of polarized electric capacity C3, the 2nd pin of tapping block CON4 and the equal ground connection of negative pole of polarized electric capacity C3, relay K 1
The two ends of coil connect positive pole and the negative pole of diode D1 respectively, and the negative pole of diode D1 connects 12V DC voltage 12V+, two poles
The colelctor electrode of the positive pole connecting triode Q1 of pipe D1, the grounded emitter of audion Q1, the base stage of audion Q1 connects resistance R1
One end, tapping block CON4 is connected to flow mutual p-wire, in PT discharge loop, relay K 2 switch normally opened contact connect separated time
1st pin of seat CON5, the common port of relay K 2 switch connects 12V DC voltage 12vl, and the 2nd pin of tapping block CON5 connects
Ground, the two ends of relay K 2 coil connect positive pole and the negative pole of diode D2 respectively, and the negative pole of diode D2 connects 12V unidirectional current
The colelctor electrode of the positive pole connecting triode Q2 of pressure 12V+, diode D2, the grounded emitter of audion Q2, the base stage of audion Q2
Connect one end of resistance R2, tapping block CON5 is connected to press mutual p-wire；Main frame MCU system (1) and transformer discharge circuit (3)
Between, the other end of resistance R3 is connected to the 21st pin of embedded microcontroller U1, and the other end of resistance R5 is connected to embed
Decline the 22nd pin of controller U1, and the resistance R1 other end of CT discharge loop is connected to the 19th of embedded microcontroller U1 and draws
Foot, the resistance R2 other end of PT discharge loop is connected to the 20th pin of embedded microcontroller U1；Main frame MCU system (1) with
Between main frame wireless transmission circuit (4), the 3rd～the 8th pin of radio receiving transmitting module interface J2 is connected respectively to embedded micro-control
17th, the 16th, the 24th, the 18th, the 15th and the 23rd pin of device U1 processed, equipped with wireless receiving and dispatching mould on radio receiving transmitting module interface J2
Block；Between main frame MCU system (1) and liquid crystal display (5), the 5th～the 14th pin of liquid crystal display interface J1 is connected respectively to
33rd～the 40th, the 2nd and the 3rd pin of embedded microcontroller U1, equipped with liquid crystal display on liquid crystal display interface J1；
In radio extension, in Exgt Bat extension battery (7), the 1st and the 2nd pin of tapping block TS3.3V connects 3.3V DC voltage respectively
VCC and ground, the 1st and the 2nd pin of tapping block TS12V connects 12V DC voltage 12vl and ground respectively, tapping block TS-GND1's
1st and the 2nd pin and the 1st and the 2nd equal ground connection of pin of tapping block TS-GND2, the 1st pin of binding post J-LED connects
One end of resistance Rled, the other end of resistance Rled connects 12V DC voltage 12vl, and the 2nd pin of binding post J-LED connects
Ground, binding post J-LED is connected to LED light；In extension set MCU system (6), binding post FW2 is connected to reset key,
The common port of relay K 12 switch connects the negative pole of diode D12, and the normally opened contact of relay K 12 switch draws 12V unidirectional current
Pressure 12V+, the two ends of relay K 12 coil connect positive pole and the negative pole of diode D12 respectively, and the negative pole of diode D12 connects
The colelctor electrode of the positive pole connecting triode Q12 of 12V DC voltage 12vl, diode D12, the grounded emitter of audion Q12, three
The base stage of pole pipe Q12 connects one end of resistance R0, and what the other end of resistance R0 was connected to embedded microcontroller U12 the 19th draws
Foot；In sampling hold circuit (8), the common port of relay K 10 and K3～K9 switch is all connected with 12V DC voltage 12V+, continues
The normally-closed contact of electrical equipment K10 and K3～K9 switch connects diode D31, D21, D51, D41, D71, D61, D91 and D81 respectively
Negative pole, relay K 10 and K3～K9 switch normally opened contact connect respectively adjustable resistance R21, R31, R41, R51, R61, R71,
The fixing end of of R81 and R91, another fixing end of adjustable resistance R21, R31, R41, R51, R61, R71, R81 and R91 is all
Ground connection, the two ends of relay K 10 and K3～K9 coil connect respectively diode D21, D31, D41, D51, D61, D71, D81 and
The negative pole of D91, positive pole, the positive pole of diode D21, D31, D41, D51, D61, D71, D81 and D91 is connected respectively to audion
The colelctor electrode of Q10 and Q3～Q9, the base stage of audion Q10 and Q3～Q9 connects the negative pole of diode D10 and D3～D9 respectively, and three
The emitter stage of pole pipe Q10 and Q3～Q9 connects the positive pole of diode D22, D32, D42, D52, D62, D72, D82 and D92 respectively,
And simultaneously all ground connection, the positive pole of diode D10 and D3～D9 connect respectively the 2nd pin of tapping block TS1, the 1st of tapping block TS1 the
Pin, the 2nd pin of tapping block TS2, the 1st pin of tapping block TS2, the 2nd pin of tapping block TS3, the 1st of tapping block TS3 the
Pin, the 2nd pin of tapping block TS4 and the 1st pin of tapping block TS4, diode D22, D32, D42, D52, D62, D72, D82
Negative pole with D92 connects the positive pole of diode D3, D10, D5, D4, D7, D6, D9 and D8 respectively, tapping block TS1, TS2, TS3 and
The upper each connection of TS4 has an extension set p-wire；In polarity display circuit (9), resistance R22, R32, R42, R52, R62, R72, R82
With the 1st～the 8th pin that one end of R92 is connected respectively to LED light positive terminal LED+, LED light positive pole connects
1st～the 8th pin of line terminals LED+ connects the positive pole of 8 LED lights respectively, and the negative pole of 8 LED lights is connected with each other
Ground connection after together；Between extension set MCU system (6) and sampling hold circuit (8), adjustable resistance R21, R31, R41, R51, R61,
The slider end of R71, R81 and R91 is connected respectively to the 33rd～the 40th pin of embedded microcontroller U12；Sampling keeps
Between circuit (8) and polarity display circuit (9), adjustable resistance R21, R31, R41, R51, R61, R71, R81 and R91 mono-fixes
End connects the other end of resistance R22, R32, R42, R52, R62, R72, R82 and R92 respectively；Extension set MCU system (6) and extension set without
Between line transmission circuit (10), the 3rd～the 8th pin of radio receiving transmitting module interface J22 is connected respectively to embedded microcontroller
The 17th of U12, the 16th, the 24th, the 18th, the 15th and the 23rd pin, equipped with wireless receiving and dispatching mould on radio receiving transmitting module interface J22
Block.
A kind of multi-analog loop polarity tester the most according to claim 4, is characterized in that: main frame MCU system (1)
In, the model of its embedded microcontroller U1 is PIC16F877A-I/P；In transformer discharge circuit (3), its diode D1's
Model is IN4001, and the model of audion Q1 is 2N3904, and the model of diode D2 is IN4001, and the model of audion Q2 is
2N3904；In extension set MCU system (6), the model of its embedded microcontroller U12 is PIC16F877A-I/P.
A kind of multi-analog loop polarity tester the most according to claim 4, is characterized in that: main frame is wirelessly transferred electricity
On radio receiving transmitting module interface J2 in road (4), and the radio receiving transmitting module interface J22 in extension set wireless transmission circuit (10)
Equipped with radio receiving transmitting module, be Monolithic RF transceiver chip, its model is nRF24L01+.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620569358.0U CN205691712U (en) | 2016-06-14 | 2016-06-14 | Multi-analog loop polarity tester |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620569358.0U CN205691712U (en) | 2016-06-14 | 2016-06-14 | Multi-analog loop polarity tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205691712U true CN205691712U (en) | 2016-11-16 |
Family
ID=57427541
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| CN201620569358.0U Withdrawn - After Issue CN205691712U (en) | 2016-06-14 | 2016-06-14 | Multi-analog loop polarity tester |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105891664A (en) * | 2016-06-14 | 2016-08-24 | 李彦吉 | Multi-path analog loop and polarity calibration instrument |
-
2016
- 2016-06-14 CN CN201620569358.0U patent/CN205691712U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105891664A (en) * | 2016-06-14 | 2016-08-24 | 李彦吉 | Multi-path analog loop and polarity calibration instrument |
| CN105891664B (en) * | 2016-06-14 | 2018-09-11 | 李彦吉 | Multi-analog loop polarity tester |
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