CN203502540U - Current transformer polarity tester - Google Patents
Current transformer polarity tester Download PDFInfo
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- CN203502540U CN203502540U CN201320540143.2U CN201320540143U CN203502540U CN 203502540 U CN203502540 U CN 203502540U CN 201320540143 U CN201320540143 U CN 201320540143U CN 203502540 U CN203502540 U CN 203502540U
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Abstract
The utility model provides a current transformer polarity tester. The current transformer polarity tester comprises a power source circuit supplying power, at least a group of primary loop electrically connected with a primary coil of the current transformer, at least a group of secondary loop electrically connected with a secondary coil of the current transformer, and a CPU circuit used for collecting and processing information and displaying test results. The power source circuit is electrically connected with the CPU circuit, each primary loop group and each secondary loop group, each secondary loop group is in signal connection with the CPU circuit, and the number of the primary loops is the same with the number of the secondary loops. The current transformer polarity tester is of high testing accuracy and high testing efficiency, is convenient to carry, and is convenient and efficient to use. Rechargeable lithium batteries provide power for the current transformer polarity tester, and tests on more than one group of transformer bushing current transformer can be simultaneously carried out by the current transformer polarity tester. Compared with a conventional tester, polarity testing time is greatly reduced, so that testing efficiency is improved, thereby facilitating the popularization of the current transformer polarity tester.
Description
Technical field
The utility model relates to the technical field of power equipment, more particularly, relates to a kind of instrument for testing polarity of current transformer.
Background technology
Current transformer is the important component part of electric system, and it is widely used in the aspects such as relay protection, electric energy metrical, distant place observing and controlling, system failure filtering.In electric system capital construction or technology innovation project construction; to carrying out polarity test before and after current transformer handing-over and overhaul, be very necessary; because first and second side of current transformer has two and above leading-out terminal; the leading-out terminal of any side is with wrong; capital makes the phase place of secondary side change 180 degree; both affect protective relaying device correct operation, affected again operation monitoring and the accident treatment of electric system, when serious, gone back entail dangers to equipment and personal safety.Therefore the polarity correctness that, correctly judges current transformer is a very important job.
Bushing shell for transformer current transformer is also a kind of current transformer, and it is arranged on the secondary device to transformer in the sleeve pipe of transformer secondary current is provided.At present, the common method of measuring transformer casing current transformer polarity has:
(1) dry cell point-polarity method: at bushing shell for transformer primary side, apply DC pulse voltage, observe the deflection of secondary side current table, thus the polarity of judgement bushing shell for transformer current transformer.But the method is in measuring process, and the impedance of transformer primary side is larger, dry cell point-polarity method is because battery capacity is little, and the deflection of ammeter pointer is not obvious, is difficult to polarity results to judge.
(2) 380V short-circuit test method: by step down side three-phase shortcircuit, draw 380V alternating voltage and be added on the three-phase of high-pressure side, with electric current split-core type meter, measure size and the direction of secondary current, thus the polarity of judgement bushing shell for transformer current transformer.But the required test apparatus of this 380V short-circuit test method is more, wiring is complicated, has certain security risk, the restriction of the voltage that is simultaneously put to the test, and the electric current that secondary side measures is very little, is difficult to the correctness of polarity to judge.
Therefore, the problem of rear polarity test difficulty is installed in order to solve above-mentioned bushing shell for transformer current transformer, now need to provide that a kind of polarity test accuracy is high, testing efficiency is high, the tester of conveniently current transformer polarity easy to carry and use, to improve transformer reliability of operation, ensure the safe and stable operation of electric system.
Utility model content
The purpose of this utility model is to overcome shortcoming of the prior art with not enough, provides that a kind of polarity test accuracy is high, testing efficiency is high, conveniently instrument for testing polarity of current transformer easy to carry and use; This tester can be tested the polarity of more than at least one group bushing shell for transformer current transformer simultaneously, compares with traditional tester, has greatly shortened the time of polarity test, thereby improves work testing efficiency, is conducive to its universal and popularization.
In order to achieve the above object, the utility model is achieved by following technical proposals: a kind of instrument for testing polarity of current transformer, is characterized in that: comprise
For the power circuit of power supply is provided;
At least one group of primary circuit being electrically connected to current transformer primary winding;
At least one group of secondary circuit being electrically connected to Current Transformer Secondary coil;
And for acquisition and processing information the cpu circuit that shows test results;
Described power circuit is electrically connected to every group of primary circuit, every group of secondary circuit and cpu circuit respectively; Described every group of secondary circuit is connected with cpu circuit signal respectively; The quantity of described primary circuit and secondary circuit is identical.
In such scheme, this tester passes into high-voltage dc pulse electric current every group of primary circuit, the signal of the electric current that every group of secondary circuit of correspondence induced after waveform transformation is sent to cpu circuit, cpu circuit is processed according to the signal collecting, and show corresponding polarity test result, thereby the problem such as solve off-capacity in conventional polar method of testing, deflection is not obvious, wiring is complicated, efficiency is low, and then improve accuracy and the testing efficiency of this tester.The quantity of primary circuit of the present utility model and secondary circuit is identical, in tester work, and the corresponding one group of primary circuit being electrically connected to its primary winding of each current transformer and one group of secondary circuit being electrically connected to its secondary coil.Tester can be realized simultaneously the polarity of more than at least one group bushing shell for transformer current transformer is tested by above-mentioned connection, forms hyperchannel polarity tester, has greatly shortened the time of polarity test, thereby improves work testing efficiency.
More particularly, described power circuit comprises power supply, power switch S0, DC/DC isolation module and power module U5; Power switch S0 is used for the closure of power supply and cut-offs; Power supply is directly electrically connected to every group of primary circuit, and power supply is electrically connected to every group of secondary circuit respectively by DC/DC isolation module simultaneously, and power supply is electrically connected to cpu circuit by DC/DC isolation module and power module U5 simultaneously.
Described every group of primary circuit is in parallel; Described in every group, primary circuit is connected to form by peripheral circuit by electric capacity, relay and diode one; Described electric capacity is electrically connected to relay by resistance two, between described electric capacity and resistance two, by resistance in series one, is electrically connected to power supply; Described relay is electrically connected to the terminals of current transformer primary winding, the terminals reverse parallel connection of diode one and current transformer primary winding.
The utility model adopts electric capacity can utilize the discharge principle of electric capacity as the power supply of tester output direct current in primary circuit, solves the problem of dry cell off-capacity.One of benefit that adopts electric capacity is the discharge current that can reduce power supply; Two of benefit is to shorten the lasting time of primary current, reduces the discharge capacity of power supply, and when relay returns simultaneously, capacitance charge amount discharges already, has reduced the turn-off current touching when relay returns.Resistance two is current-limiting resistance, can prevent that capacitor discharge electric current is excessive.Terminals at current transformer primary winding are incorporated to reverse diode one, and in the time of can preventing cutoff circuit, moment produces superpotential harm.
Described every group of secondary circuit is in parallel; Described in every group, secondary circuit is connected to form by diode two, diode three, reometer, signal amplification circuit and waveform transformation circuit; Described diode two and diode three be forward and oppositely in parallel with the terminals of Current Transformer Secondary coil respectively; Described reometer input end is electrically connected to the terminals of Current Transformer Secondary coil, and output terminal is connected with signal amplification circuit, waveform transformation circuit successively signal; Described reometer is in parallel with resistance three and resistance four, to realize the selection of reometer range.
Reometer of the present utility model is indicator type current meter, and in order to prevent the excessive damage reometer of electric current, it is provided with protector.Reometer is switched and is formed three range reometers by switch S: when S is during to centre position, resistance three and resistance four all disconnect, and reometer range is 50uA; When S and upper end connection, resistance three is in parallel with reometer, and reometer range is 100uA; When S and lower end connection, resistance four is in parallel with reometer, and reometer range is 500uA, to adapt to the test of the current transformer polarity of different no-load voltage ratios.If secondary circuit input is excessive, the diode two in parallel with the terminals of Current Transformer Secondary coil and diode three conductings respectively, secondary side input ceiling voltage is limited in 0.7V, for the protection of reometer, is not burnt.
Described power supply is electrically connected to and refers to every group of secondary circuit respectively by DC/DC isolation module simultaneously, and power supply is electrically connected to signal amplification circuit and waveform transformation circuit in every group of secondary circuit respectively by DC/DC isolation module; Waveform transformation circuit in described every group of secondary circuit comprises subtractive polarity waveform transformation circuit and additive polarity waveform transformation circuit.The voltage signal at reometer two ends is after signal amplification circuit amplifies, deliver to waveform transformation circuit, waveform transformation circuit has two, and one for converting positive signal (subtractive polarity), one for converting negative signal (additive polarity), becomes pulse digital signal and deliver to cpu circuit after conversion.
Described cpu circuit comprises CPU, at least one group of light emitting diode, at least one test button and driving circuit; Described every group of light emitting diode comprises subtractive polarity light emitting diode and additive polarity light emitting diode, and is electrically connected to the output terminal of CPU; Described in each, test button is connected to the input end of CPU as test commencing signal; The input end of described CPU is connected with the waveform transformation circuit signal of every group of secondary circuit respectively; The input end of described driving circuit is electrically connected to CPU, and its output terminal is connected with the relay of every group of primary circuit, for the switching of pilot relay; Described every group of light emitting diode, each test button match with every group of corresponding primary circuit, every group of secondary circuit.
The electric current of responding in secondary circuit is delivered to CPU after waveform transformation.When the polarity of the current transformer with tester wiring is subtractive polarity, subtractive polarity waveform transformation circuit output signal value is to CPU, and CPU output signal drives subtractive polarity light emitting diode bright, and keeps; When the polarity of the current transformer with tester wiring is additive polarity, additive polarity waveform transformation circuit output signal value is to CPU, and CPU output signal drives additive polarity light emitting diode bright, and keeps.Wherein, keep electric current to be equal to or less than 10 microamperes.
Described cpu circuit also comprises that described reset button is electrically connected to CPU input end for recovering to test the reset button of initial state.In tester use procedure, by reset button, can retest the polarity of current transformer.
The utility model tester also comprises for monitoring the electric voltage observation circuit of electric quantity of power supply situation; Described electric voltage observation circuit input end is connected to measure supply voltage with both ends of power, its output terminal is connected with cpu signal by optocoupler.When supply voltage is during higher than 10.8V, electric voltage observation circuit output high level, signal is sent to CPU after optocoupler, and now power light is bright; When supply voltage is during lower than 10.8V, electric voltage observation circuit output low level, signal is sent to CPU after optocoupler, and now power light flicker represents that power supply needs charging.
This tester also comprises the portable general charger for power supply source charging; Described power supply is the chargeable lithium ion battery of 12V.Tester of the present utility model adopts the lithium ion battery of charging that this tester can be worked without external power supply in the situation that, supports the use with charger, improves its portability, convenience and versatility.
Also comprise casing and guidance panel; Described power circuit, primary circuit, secondary circuit and cpu circuit are all arranged in casing, and cover formation seal case by guidance panel.Casing selects aluminum alloy material to make, and can be adapted at temperature and use in-5～45 ℃, the environment of relative humidity <80%.
The test philosophy of the utility model instrument for testing polarity of current transformer is such: tester configures the input and output loop of at least one passage, and every road input channel configures independently reometer and subtractive polarity light emitting diode and additive polarity light emitting diode.The chargeable lithium ion battery of 12V, as the charge power supply of electric capacity, utilizes the discharge principle of electric capacity as the output direct supply of polarity tester.
Power switch S0 is closed, and power supply is given the capacitor charging in every group of primary circuit.When test button is pressed, the actuating of relay (continuing to return after 1s), every group of primary circuit connected, and electric capacity discharges to current transformer primary winding.Now, in current transformer primary winding, produced momentary pulse electric current.
The secondary circuit being electrically connected to Current Transformer Secondary winding wiring induces this electric current, and the reometer in every group of secondary circuit is made respective reaction (pointer left avertence or right avertence) to input current; Meanwhile, the voltage signal at reometer two ends is sent to waveform transformation circuit after amplifying by signal amplification circuit, and the pulse digital signal after conversion is sent to CPU and shows polarity test result.The utility model is different according to the characteristic of current transformer, the faradic variation of secondary, and reometer can be selected range by gear, thereby strengthens the amplitude of fluctuation of pointer.If while being subtractive polarity with the polarity of the current transformer of tester wiring, the electric current in every group of secondary circuit flows to S2 by S1 end and holds, the pointer right avertence of reometer; Now, subtractive polarity waveform transformation circuit output signal value is to CPU, and CPU output signal drives subtractive polarity light emitting diode bright, and keeps.If while being additive polarity with the polarity of the current transformer of tester wiring, the electric current in every group of secondary circuit flows to S1 by S2 end and holds, the pointer left avertence of reometer; Now, additive polarity waveform transformation circuit output signal value is to CPU, and CPU output signal drives additive polarity light emitting diode bright, and keeps.Tester of the present utility model, by reometer and two kinds of modes that show polarity test result of light emitting diode, can judge the correctness of current transformer polarity more intuitively.
When relay disconnects, the loop that current mutual inductor coil discharges is over the ground connected, and now in current transformer primary winding, residual electric charge is eliminated.When pressing reset button, can recover the test initial state of tester.
Compared with prior art, the utlity model has following advantage and beneficial effect:
The problems such as 1, the utility model instrument for testing polarity of current transformer has solved off-capacity in conventional polar method of testing, deflection is not obvious, wiring is complicated, efficiency is low, thereby improve the efficiency of accuracy and the test of this test result, applicable to the polarity test that becomes the mutual device of casing current and ordinary electric current mutual-inductor.
2, the quantity of primary circuit of the present utility model and secondary circuit is identical, the corresponding one group of primary circuit being electrically connected to its primary winding of each current transformer and one group of secondary circuit being electrically connected to its secondary coil.Tester can be realized simultaneously fast, accurately the polarity of more than at least one group bushing shell for transformer current transformer be tested by above-mentioned connection, forms hyperchannel polarity tester, has greatly shortened the time of polarity test, thereby improves work testing efficiency.
3, the utility model solves the problem of dry cell off-capacity, and intelligently test result is kept; This tester is light, wiring is simple, has solved the problems such as the wiring of 380V short-circuit test method is complicated, test result is not obvious.
4, the utility model tester adopts charged lithium cells power supply, and this tester can be worked without external power supply in the situation that, supports the use with charger, improves its portability, convenience and versatility.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the utility model instrument for testing polarity of current transformer;
Fig. 2 is the structural representation of the utility model instrument for testing polarity of current transformer guidance panel;
Wherein, 1 is that primary output terminals, 2 is that reometer range shift switch, 3 is that electric current gauge outfit, 4 is that polarity pilot lamp, 5 is that secondary input terminal, 6 is that test button, 7 is that ground terminal, 8 is that reset button, 9 is that charging socket, 10 is that power light, 11 is power switch.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the utility model is described in further detail.
Embodiment
The present embodiment take instrument for testing polarity of current transformer as four-way instrument for testing polarity of current transformer as example to describing below.
The circuit diagram of the utility model instrument for testing polarity of current transformer as shown in Figure 1, comprises for the power circuit of power supply is provided; Four groups of primary circuits that are electrically connected to current transformer primary winding; Four groups of secondary circuits that are electrically connected to Current Transformer Secondary coil; And for acquisition and processing information the cpu circuit that shows test results; Wherein, power circuit is electrically connected to every group of primary circuit, every group of secondary circuit and cpu circuit respectively; Every group of secondary circuit is connected with cpu circuit signal respectively.
Power circuit comprises that the chargeable lithium ion battery of 12V is as power supply, power switch S0, DC/DC isolation module and power module U5.Power switch S0 is used for the closure of power supply and cut-offs.Power supply is directly electrically connected to every group of primary circuit; Simultaneously export by DC/DC isolation module ± 12V of power supply power supply is electrically connected to every group of secondary circuit respectively; Simultaneously export by DC/DC isolation module+12V of power supply power supply is electrically connected to cpu circuit by power module U5, for powering to CPU; Output+12V power supply returns the power supply of relay in every group of primary circuit.
Every group of primary circuit is in parallel, and connects to form by peripheral circuit by electric capacity, relay and diode one; It is all identical that four groups of primary circuit circuit form, take first group be described as follows as example: first group of primary circuit connected to form by peripheral circuit as electric capacity 1C1, relay K 1 and diode one 1D1 by capacity.Electric capacity 1C1 is electrically connected to relay K 1 by resistance two 1R2, between electric capacity 1C1 and resistance two 1R2, by resistance in series one 1R1, is electrically connected to power supply; Relay K 1 is electrically connected to terminals 1P1, the 1P2 of Current Transmit 1 primary winding, and terminals 1P1, the 1P2 reverse parallel connection of diode one 1D1 and Current Transmit 1 primary winding produce superpotential harm when preventing cutoff circuit moment.
In first group of primary circuit, power supply charges to electric capacity 1C1 through resistance one 1R1, wherein, resistance one 1R1 specification is " 5W, 51 Ω ", the capacity of electric capacity 1C1 is 10000uF, charging rate is 0.51s, thus need about 3s left and right time electric capacity substantially to have charged, maximum charging current I1=12V/51 Ω=0.24A.One of benefit that adopts electric capacity 1C1 in primary circuit is the discharge current that can reduce power supply.When pressing test button, relay K 1 action (continuing to return after 1s), primary circuit is connected, electric capacity 1C1 discharges to Current Transmit 1 primary winding, and resistance two 1R2 specifications are " 10W, 2 Ω ", so CT1 primary side maximum instantaneous electric current is I2=12V/2 Ω=6A, because output lead has resistance, at the resistance that adds CT1 primary circuit, CT1 primary side maximum instantaneous electric current is less than 6A.Two of the benefit of employing electric capacity 1C1 is to shorten the lasting time of primary current, reduce the discharge capacity of power supply, when relay K 1 is returned simultaneously, the electric capacity 1C1 quantity of electric charge discharges already, has reduced the turn-off current (maximum current I3=12V/ (51+2) Ω=0.23A when relay returns) of shake-up when relay K 1 is returned.
Every group of secondary circuit is in parallel, and connects to form by diode two, diode three, reometer, signal amplification circuit and waveform transformation circuit.Four groups of secondary circuit circuit form all identical, take first group be described as follows as example: first group of secondary circuit connected to form by diode two 1D2, diode three 1D3, reometer, signal amplification circuit and waveform transformation circuit.Diode two 1D2 and diode three 1D3 are forward and oppositely in parallel with terminals 1S1, the 1S2 of Current Transmit 1 secondary coil respectively, and secondary side input ceiling voltage is limited in 0.7V, for the protection of reometer, is not burnt.Reometer input end is electrically connected to terminals 1S1, the 1S2 of Current Transmit 1 secondary coil, and its output terminal is connected with signal amplification circuit, waveform transformation circuit successively signal.Reometer is in parallel with resistance three 1R3 and resistance four 1R4, to realize the selection of reometer range.
When electric capacity 1C1 discharges moment through Current Transmit 1 primary winding, in primary winding, produced momentary pulse electric current, this electric current can induce in Current Transmit 1 secondary coil.If while being subtractive polarity with the polarity of the Current Transmit 1 of tester wiring, secondary current flows to 1S2 by 1S1, reometer right avertence, is expressed as subtractive polarity; Otherwise reometer left avertence, is expressed as additive polarity.Reometer can be switched and be formed three range reometers by switch S 1: when S1 is during to centre position, resistance three 1R3 and resistance four 1R4 all disconnect, and reometer range is 50uA; When S1 and upper end connection, resistance three 1R3 are in parallel with reometer, and reometer range is 100uA; When S1 and lower end connection, resistance four 1R4 are in parallel with reometer, and reometer range is 500uA, to adapt to the test of Current Transmit 1 polarity of different no-load voltage ratios.Power supply is electrically connected to signal amplification circuit and waveform transformation circuit respectively by DC/DC isolation module.The voltage signal at reometer two ends is after signal amplification circuit amplifies, deliver to waveform transformation circuit, waveform transformation circuit has two, one for converting the subtractive polarity waveform transformation circuit of positive signal, another,, for converting the additive polarity waveform transformation circuit of negative signal, delivers to cpu circuit by becoming pulse digital signal after conversion.
Cpu circuit comprises CPU, four groups of light emitting diodes, four test button SB1-SB4 and driving circuit, and every group of light emitting diode, each test button match with every group of corresponding primary circuit, every group of secondary circuit.Wherein, every group of light emitting diode comprises subtractive polarity light emitting diode and additive polarity light emitting diode, and is electrically connected to the output terminal of CPU; Each test button is connected to the input end of CPU as test commencing signal; The input end of CPU is connected with the waveform transformation circuit signal of every group of secondary circuit respectively.And the input end of driving circuit is electrically connected to CPU, its output terminal is connected with the relay of every group of primary circuit, for the switching of pilot relay.In the utility model tester, every group of light emitting diode, each test button all match with every group of corresponding primary circuit, every group of secondary circuit.Cpu circuit also comprises that reset button SB5 is electrically connected to CPU input end for recovering to test the reset button SB5 of initial state.
The utility model tester also comprises for monitoring the electric voltage observation circuit of electric quantity of power supply situation; Electric voltage observation circuit input end is connected to measure supply voltage with both ends of power, its output terminal is connected with cpu signal by optocoupler.When supply voltage is during higher than 10.8V, electric voltage observation circuit output high level, signal is sent to CPU after optocoupler, and now power light is bright; When supply voltage is during lower than 10.8V, electric voltage observation circuit output low level, signal is sent to CPU after optocoupler, and now power light flicker represents that power supply needs charging.
This tester also comprises the portable general charger for power supply source charging.The utility model adopts the lithium ion battery of charging that this tester can be worked without external power supply in the situation that, supports the use with charger, improves its portability, convenience and versatility.This tester also comprises casing and guidance panel, and the guidance panel of tester as shown in Figure 2.Wherein, power circuit, primary circuit, secondary circuit and cpu circuit are all arranged in casing, and cover formation seal case by guidance panel.Casing selects aluminum alloy material to make, and can be adapted at temperature and use in-5～45 ℃, the environment of relative humidity <80%.
The test philosophy of the utility model instrument for testing polarity of current transformer is such: the input and output loop of tester configuration four-way, every road input channel configures independently reometer and subtractive polarity light emitting diode and additive polarity light emitting diode.The chargeable lithium ion battery of 12V, as the charge power supply of electric capacity, utilizes the discharge principle of electric capacity as the output direct supply of polarity tester.
Power switch S0 is closed, and power supply is given the charging of the electric capacity 1C1-4C1 in every group of primary circuit.When test button SB1-SB4 presses, relay K 1-K4 action (continuing to return after 1s), every group of primary circuit connected, and electric capacity 1C1-4C1 discharges to Current Transmit 1-CT4 primary winding.Now, in Current Transmit 1-CT4 primary winding, produced momentary pulse electric current.
The secondary circuit being electrically connected to Current Transmit 1-CT4 secondary coil terminals induces this electric current, and the reometer in every group of secondary circuit is made respective reaction (pointer left avertence or right avertence) to input current; Meanwhile, the voltage signal at reometer two ends is sent to waveform transformation circuit after amplifying by signal amplification circuit, and the pulse digital signal after conversion is sent to CPU and shows polarity test result.The utility model is different according to the characteristic of current transformer, the faradic variation of secondary, and reometer can be selected range by gear, thereby strengthens the amplitude of fluctuation of pointer.If while being subtractive polarity with the polarity of the current transformer of tester wiring, the electric current in every group of secondary circuit flows to S2 by S1 end and holds, the pointer right avertence of reometer; Now, subtractive polarity waveform transformation circuit output signal value is to CPU, and CPU output signal drives subtractive polarity light emitting diode bright, and keeps.If while being additive polarity with the polarity of the current transformer of tester wiring, the electric current in every group of secondary circuit flows to S1 by S2 end and holds, the pointer left avertence of reometer; Now, additive polarity waveform transformation circuit output signal value is to CPU, and CPU output signal drives additive polarity light emitting diode bright, and keeps.Tester of the present utility model, by reometer and two kinds of modes that show polarity test result of light emitting diode, can judge the correctness of current transformer polarity more intuitively.
When relay K 1-K4 disconnects, the loop that Current Transmit 1-CT4 coil discharges is over the ground connected, and now in Current Transmit 1-CT4 primary winding, residual electric charge is eliminated.When pressing reset button SB5, can recover the test initial state of tester.
Tester of the present utility model is light, easy to carry, easy operation, can be simultaneously quick and precisely to one group or the polarity of the bushing shell for transformer current transformer of two groups, three groups or four groups is tested simultaneously, as shown in Figure 2, its operation using method is such to the structural representation of this tester guidance panel:
(1) by corresponding primary output terminals 1 on primary winding terminals P1, the P2 access tester guidance panel of current transformer to be measured, corresponding secondary input terminal 5 on secondary coil terminals S1, the S2 access tester panel of current transformer to be measured.
(2) pressing power switch 11 and test button 6 starts current transformer to be measured to carry out polarity test.
(3) by observing the yawing moment of electric current gauge outfit 3 interior pointers or the demonstration of polarity pilot lamp 4, can directly obtain the result of polarity test.If the pointer right avertence in electric current gauge outfit 3 or subtractive polarity pilot lamp are bright and maintenance, the polarity P1 of tested current transformer and S1 are subtractive polarity; If the pointer left avertence in electric current gauge outfit 3 or additive polarity pilot lamp are bright and maintenance, the polarity P1 of tested current transformer and S1 are additive polarity.
In polarity test process, reometer can be switched and be formed 50uA, 100uA or the three-range reometer of 500uA by reometer range shift switch 2, to adapt to the test of the current transformer polarity of different no-load voltage ratios.Tester is provided with connection terminal 7, realizes reliable ground.Upper once to current transformer polarity testing before, can reset by 8 pairs of testers of reset button, the time of each test interval should be greater than 3 seconds.The chargeable lithium ion battery of 12V for the power acquisition of tester of the present utility model, when power light 10 is bright, represent that power supply is sufficient, supply voltage is normal, when power light 10 flickers represent that power supply needs charging, 9 pairs of power supplys of charging socket that operating personnel can insert the output terminal of portable general charger tester charge.
Above-described embodiment is preferably embodiment of the utility model; but embodiment of the present utility model is not restricted to the described embodiments; other any do not deviate from change, the modification done under Spirit Essence of the present utility model and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection domain of the present utility model.
Claims (10)
1. an instrument for testing polarity of current transformer, is characterized in that: comprise
For the power circuit of power supply is provided;
At least one group of primary circuit being electrically connected to current transformer primary winding;
At least one group of secondary circuit being electrically connected to Current Transformer Secondary coil;
And for acquisition and processing information the cpu circuit that shows test results;
Described power circuit is electrically connected to every group of primary circuit, every group of secondary circuit and cpu circuit respectively; Described every group of secondary circuit is connected with cpu circuit signal respectively; The quantity of described primary circuit and secondary circuit is identical.
2. instrument for testing polarity of current transformer according to claim 1, is characterized in that: described power circuit comprises power supply, power switch S0, DC/DC isolation module and power module U5; Power switch S0 is used for the closure of power supply and cut-offs; Power supply is directly electrically connected to every group of primary circuit, and power supply is electrically connected to every group of secondary circuit respectively by DC/DC isolation module simultaneously, and power supply is electrically connected to cpu circuit by DC/DC isolation module and power module U5 simultaneously.
3. instrument for testing polarity of current transformer according to claim 2, is characterized in that: described every group of primary circuit is in parallel; Described in every group, primary circuit is connected to form by peripheral circuit by electric capacity, relay and diode one; Described electric capacity is electrically connected to relay by resistance two, between described electric capacity and resistance two, by resistance in series one, is electrically connected to power supply; Described relay is electrically connected to the terminals of current transformer primary winding, the terminals reverse parallel connection of diode one and current transformer primary winding.
4. instrument for testing polarity of current transformer according to claim 3, is characterized in that: described every group of secondary circuit is in parallel; Described in every group, secondary circuit is connected to form by diode two, diode three, reometer, signal amplification circuit and waveform transformation circuit; Described diode two and diode three be forward and oppositely in parallel with the terminals of Current Transformer Secondary coil respectively; Described reometer input end is electrically connected to the terminals of Current Transformer Secondary coil, and output terminal is connected with signal amplification circuit, waveform transformation circuit successively signal; Described reometer is in parallel with resistance three and resistance four, to realize the selection of reometer range.
5. instrument for testing polarity of current transformer according to claim 4, it is characterized in that: described power supply is electrically connected to and refers to every group of secondary circuit respectively by DC/DC isolation module simultaneously, power supply is electrically connected to signal amplification circuit and waveform transformation circuit in every group of secondary circuit respectively by DC/DC isolation module; Waveform transformation circuit in described every group of secondary circuit comprises subtractive polarity waveform transformation circuit and additive polarity waveform transformation circuit.
6. instrument for testing polarity of current transformer according to claim 5, is characterized in that: described cpu circuit comprises CPU, at least one group of light emitting diode, at least one test button and driving circuit; Described every group of light emitting diode comprises subtractive polarity light emitting diode and additive polarity light emitting diode, and is electrically connected to the output terminal of CPU; Described in each, test button is connected to the input end of CPU as test commencing signal; The input end of described CPU is connected with the waveform transformation circuit signal of every group of secondary circuit respectively; The input end of described driving circuit is electrically connected to CPU, and its output terminal is connected with the relay of every group of primary circuit, for the switching of pilot relay; Described every group of light emitting diode, each test button match with every group of corresponding primary circuit, every group of secondary circuit.
7. instrument for testing polarity of current transformer according to claim 6, is characterized in that: described cpu circuit also comprises that described reset button is electrically connected to CPU input end for recovering to test the reset button of initial state.
8. instrument for testing polarity of current transformer according to claim 6, is characterized in that: also comprise for monitoring the electric voltage observation circuit of electric quantity of power supply situation; Described electric voltage observation circuit input end is connected to measure supply voltage with both ends of power, its output terminal is connected with cpu signal by optocoupler.
9. instrument for testing polarity of current transformer according to claim 2, is characterized in that: also comprise the portable general charger for power supply source charging; Described power supply is the chargeable lithium ion battery of 12V.
10. instrument for testing polarity of current transformer according to claim 1, is characterized in that: also comprise casing and guidance panel; Described power circuit, primary circuit, secondary circuit and cpu circuit are all arranged in casing, and cover formation seal case by guidance panel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320540143.2U CN203502540U (en) | 2013-08-30 | 2013-08-30 | Current transformer polarity tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320540143.2U CN203502540U (en) | 2013-08-30 | 2013-08-30 | Current transformer polarity tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203502540U true CN203502540U (en) | 2014-03-26 |
Family
ID=50333510
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320540143.2U Expired - Lifetime CN203502540U (en) | 2013-08-30 | 2013-08-30 | Current transformer polarity tester |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103454554A (en) * | 2013-08-30 | 2013-12-18 | 广东威恒输变电工程有限公司 | Polarity tester for current transformer |
| CN103954883A (en) * | 2014-05-21 | 2014-07-30 | 中国化学工程第十一建设有限公司 | Voltage transformer secondary connection inspecting method and device |
| CN104865494A (en) * | 2015-05-06 | 2015-08-26 | 国家电网公司 | Portable current transformer polarity testing device and use method thereof |
| CN107741551A (en) * | 2017-10-11 | 2018-02-27 | 国网宁夏电力公司吴忠供电公司 | 110kV polarity testing device of current transformer |
| CN108107314A (en) * | 2017-12-14 | 2018-06-01 | 国家电网公司 | A kind of polarity testing device of current transformer |
| CN108181545A (en) * | 2017-12-29 | 2018-06-19 | 国家电网公司 | A kind of polarity test circuit for current transformer |
| CN108226846A (en) * | 2018-04-10 | 2018-06-29 | 国家电网公司 | A kind of generic polar test circuit |
| CN109116088A (en) * | 2018-10-16 | 2019-01-01 | 国网青海省电力公司西宁供电公司 | A kind of high precision electro electromagnetic type voltage transformer no-load current test device |
| CN109444623A (en) * | 2018-10-17 | 2019-03-08 | 哈尔滨工程大学 | The balanced topology protection of multiwinding transformer and open-circuit fault detection device |
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2013
- 2013-08-30 CN CN201320540143.2U patent/CN203502540U/en not_active Expired - Lifetime
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103454554A (en) * | 2013-08-30 | 2013-12-18 | 广东威恒输变电工程有限公司 | Polarity tester for current transformer |
| CN103454554B (en) * | 2013-08-30 | 2017-04-12 | 广东威恒输变电工程有限公司 | Polarity tester for current transformer |
| CN103954883A (en) * | 2014-05-21 | 2014-07-30 | 中国化学工程第十一建设有限公司 | Voltage transformer secondary connection inspecting method and device |
| CN104865494A (en) * | 2015-05-06 | 2015-08-26 | 国家电网公司 | Portable current transformer polarity testing device and use method thereof |
| CN107741551A (en) * | 2017-10-11 | 2018-02-27 | 国网宁夏电力公司吴忠供电公司 | 110kV polarity testing device of current transformer |
| CN108107314A (en) * | 2017-12-14 | 2018-06-01 | 国家电网公司 | A kind of polarity testing device of current transformer |
| CN108181545A (en) * | 2017-12-29 | 2018-06-19 | 国家电网公司 | A kind of polarity test circuit for current transformer |
| CN108181545B (en) * | 2017-12-29 | 2020-10-27 | 国家电网公司 | Polarity test circuit for current transformer |
| CN108226846A (en) * | 2018-04-10 | 2018-06-29 | 国家电网公司 | A kind of generic polar test circuit |
| CN108226846B (en) * | 2018-04-10 | 2020-02-07 | 国家电网公司 | General polarity test circuit |
| CN109116088A (en) * | 2018-10-16 | 2019-01-01 | 国网青海省电力公司西宁供电公司 | A kind of high precision electro electromagnetic type voltage transformer no-load current test device |
| CN109444623A (en) * | 2018-10-17 | 2019-03-08 | 哈尔滨工程大学 | The balanced topology protection of multiwinding transformer and open-circuit fault detection device |
| CN109444623B (en) * | 2018-10-17 | 2020-11-20 | 哈尔滨工程大学 | Balanced topology protection and open circuit fault detection device for multi-winding transformer |
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