CN101477150B - Method for implementing fast measurement of inductive winding DC resistance by using constant voltage source - Google Patents
Method for implementing fast measurement of inductive winding DC resistance by using constant voltage source Download PDFInfo
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- CN101477150B CN101477150B CN2009100607333A CN200910060733A CN101477150B CN 101477150 B CN101477150 B CN 101477150B CN 2009100607333 A CN2009100607333 A CN 2009100607333A CN 200910060733 A CN200910060733 A CN 200910060733A CN 101477150 B CN101477150 B CN 101477150B
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Abstract
The invention discloses a method for realizing the rapid measurement of direct current resistance of an inductive winding by utilizing a constant voltage source. The rapid measurement is realized by utilizing the constant voltage source in a rapid measurement instrument of the direct current resistance of the inductive winding to maintain a constant working voltage, selecting the range according to the resistance range to be tested of a winding of inductive equipment and adjusting the current of a measurement circuit by changing a resistance value of a range circuit; and a circuit of the rapid measurement instrument comprises a power supply device, the range circuit, a millivoltmeter and a control circuit of the constant voltage source. The method can realize the rapid measurement of the direct current resistance of windings of inductive equipment such as transformers, generators, engines, electric reactors and so on, and is suitable for field debugging at construction stages of metallurgical enterprises. The rapid measurement instrument, which has the characteristics of light weight, convenient carrying, simple operation, safety and applicability, of the direct current resistance of windings of inductive loading equipment can be produced according to the method; and the rapid measurement instrument can substitute a double electric bridge and constant current source method to measure the direct current resistance of the inductive windings, and has the advantages of quick measurement speed, strong anti-jamming ability, steady and intuitive readings, and high accuracy.
Description
Technical field
The present invention relates to the method that DC resistance of inductive winding is measured, particularly relate to a kind of constant pressure source that utilizes and realize the method that inductive load equipment winding D.C. resistance is measured fast.
Background technology
The measurement of winding D.C. resistances such as transformer, reactor, motor is as the national standard pilot project of " Erection works of electrical installations Standard for handover test of electric equipment GB50150-2006 " defined, can check out the welding quality of winding inner lead, lead-in wire and the welding quality that winds the line, whether the specification of used lead of winding the line adheres to specification, whether shunting switch, lead-in wire be good with contacting of carrying objects such as sleeve pipe, and whether three-phase resistance balance etc.But because the winding of these loads is perception, particularly the big capacity load inductance is very big, carries out the work that the direct current resistance measurement is a time and effort consuming by traditional double bridge.We utilized DC resistance of inductive winding R such as double bridge measuring transformer in the past
XDuration of charging very long, according to the electric pressure difference of equipment under test and a few minutes after a little while in duration of charging (every survey once), dozens of minutes at most, is example to a transformer with five gears, 2-4 hour so at least, 8-24 hour at most, there are measurement data instability, test duration length, complicated operation and the not high shortcoming of security.The similar perceptual direct current resistance of Xiao Shouing is surveyed the instrument product soon in the market, generally takes the method for constant current source control to detect, and exists device to need preheating, DATA REASONING instability, big electric current to need shortcomings such as ac working power supply.
Summary of the invention
Technical matters to be solved by this invention is: provide a kind of constant pressure source that utilizes to realize the method that large, medium and small type transformer, generator, motor, reactor and other inductive load equipment winding D.C. resistance are measured fast.
The present invention solves its technical matters and adopts following technical scheme:
The method of utilizing constant pressure source to realize fast measurement of inductive winding DC resistance provided by the invention, specifically: utilize the constant pressure source in the fast measurement of inductive winding DC resistance instrument to keep constant operating voltage, Standard resistance range according to perceptual equipment winding to be tested is selected range, measure loop current by the resistance value adjusting that changes range circuit, realize measuring fast, test the speed＜100 seconds; The circuit of described instrument for quick measuring is formed the control circuit that comprises electric supply installation, range circuit, milivoltmeter and constant pressure source.
The present invention adopts the method that may further comprise the steps:
(1) structure of the related device of system of selection, capacity and component parameter configuration according to actual needs:
4NIC-DC75W type constant pressure source, SLA1055-12V/4.5AH type accumulator, the model of two milivoltmeters is respectively MMS-A19A, MMS-A19A, and rated current is respectively the fuse of 1.5A and 2.5A, and multiturn potentiometer resistance 20k Ω, rated current are the diode D of 10A and the capacitor of 10uF, R1=50k Ω, R2=100k Ω, R3=50k Ω, R4=5k Ω, R5=510 Ω, R6=51 Ω, R7=5 Ω, R8=0.5 Ω, R9=900 Ω, R10=90 Ω, R11=9 Ω, R12=0.9 Ω, R13=0.09 Ω, R14=0.01 Ω.
(2) select additional resistance and range convert resistance according to the Standard resistance range of tested perceptual winding:
Scope for each range circuit design additional resistance and range resistance; Thereby the effect of additional resistance is to reduce timeconstant to shorten Measuring Time, to measuring accuracy and result without any influence; The effect of the similar voltage divider of range convert resistance, its resistance minimal design are 0.01 Ω and are that the unit multiplying power changes with 10, be convenient to milivoltmeter mV1 reading.
(3) utilize Ohm law R=U/I to carry out the measurement of DC resistance of inductive winding:
Making milivoltmeter mV1 displayed value by the voltage output of regulating source of stable pressure is integer 100, then the winding L of milivoltmeter mV2 demonstration
Both end voltage reflects the resistance value of winding L thereupon, and conversion multiplying power and unit clearly identify on guidance panel; The voltage output range of described source of stable pressure is 4.8～5.8V.Adopt following measuring method:
1) perceptual equipment winding to be tested is pressed current terminal C1, the C2 of fast measurement of inductive winding DC resistance instrument and voltage terminal P1, the wiring of P2 corresponding function;
2) the power turn-on K switch 1, and the selector switch K2 that will charge/measure places " measurement " position;
3) regulate range switch K3 gear and make milivoltmeter mV1 displayed value maximum, regulating multiturn potentiometer again, to make milivoltmeter mV1 displayed value be 100;
4) press survey measurements button TA, read the displayed value of milivoltmeter mV2, this card indication multiplying power with the current selected gear correspondence of range switch K3 on duty promptly gets tested DC resistance of inductive winding value;
5) measurement finishes, disconnecting power switch K1, and the selector switch of will charging/measure places the position of " breaking ";
6) when two milivoltmeter mV1, mV2 displayed value are zero, remove external connection, carry out further work.
The method of utilizing constant pressure source to realize fast measurement of inductive winding DC resistance provided by the invention, it carries out the application of quick measurement of DC resistance to perceptual equipment winding to be tested in the metallurgical industry electrical installation project.
The present invention compared with prior art has following major advantage:
One. use wide: the quick measurement of DC resistance that can realize large, medium and small transformer, generator, motor, reactor and other inductive load equipment winding.Being suitable for smelter construction stage field adjustable uses.
They are two years old. and according to the inductive load equipment winding D.C. resistance instrument for quick measuring of this method made, can replace double bridge and constant current source method and measure DC resistance of inductive winding, and it is fast to test the speed, and tests the speed＜100 seconds.
They are three years old. according to the inductive load equipment winding D.C. resistance instrument for quick measuring of this method made, not only overcome the shortcoming of long, anti-interference difference of double bridge running time, and need not preheating, need not ac power supply, by storage battery power supply, tested thing there is not the shortest duration of charging requirement, can satisfy the direct current resistance of all kinds inductive load in the metallurgical construction work of present stage and measure, meet country's new promulgation power industry standard " instrument for measuring DC resistance general technical specifications DL/T 845.3-2004 " requirement.
They are four years old. and can make in light weightly according to this method, be easy to carry, simple to operate, stable reading is directly perceived, degree of accuracy height, and the inductive load equipment winding D.C. resistance instrument for quick measuring of safe and applicable.
Description of drawings
Fig. 1 is the fast measurement of inductive winding DC resistance instrument electrical schematic diagram of making according to this method.
Fig. 2 is the principle of work synoptic diagram according to the fast measurement of inductive winding DC resistance instrument of this method making.
Embodiment
The method of utilizing constant pressure source to realize fast measurement of inductive winding DC resistance provided by the invention, be to utilize the constant pressure source in the fast measurement of inductive winding DC resistance instrument to keep constant operating voltage, Standard resistance range according to perceptual equipment winding to be tested is selected range, measure loop current by the resistance value adjusting that changes range circuit, realize measuring fast, test the speed＜100 seconds; The circuit of described instrument for quick measuring is formed the control circuit that comprises electric supply installation, range circuit, milivoltmeter and constant pressure source.The model of described constant pressure source is 4NIC-DC75W.
The method of utilizing constant pressure source to realize fast measurement of inductive winding DC resistance provided by the invention, it carries out the application of quick measurement of DC resistance to perceptual equipment winding to be tested in the metallurgical industry electrical installation project.
Described perceptual equipment winding to be tested comprises large, medium and small type transformer, generator, motor, reactor and mutual inductor.
Cover fast measurement of inductive winding DC resistance instrument (Fig. 1) with preparation is an example below, and the invention will be further described.
1. accumulator charge/discharge control circuit part:
The outer attached charger of device, by charging socket CA to charge in batteries.1.5A fuse F1 one termination is gone into "+" jack of charging socket CA, the other end links to each other with No. 1 terminal of charging/measurement selector switch K2."-" jack of charging socket CA links to each other with No. 2 terminals, the negative pole of 24V power light XD1, the DC converter power input negative pole of power switch K1 respectively.The positive pole of 24V accumulator BT connects the a1 terminal of power switch K1, and negative pole connects the a2 terminal of power switch K1.The negative pole of 24V cell voltage indicating gauge V1 connects No. 2 terminals of power switch K1, and positive pole connects No. 1 terminal of power switch K1.Battery charging/discharging electric current indicating gauge A1 positive pole connects No. 5 terminals of charging/measurement selector switch K2, and negative pole links to each other with No. 2 terminals of charging/measurement selector switch K2.No. 1 terminal of power switch K1 respectively with No. 3, No. 4 terminal short circuits of charging/measurement selector switch K2.2.5A the end of fuse F2 links to each other with No. 1 terminal of charging/measurement selector switch K2, the other end links to each other with positive pole, the DC converter power supply HYY input anode of 24V power light XD1 respectively.
2. constant pressure source control circuit part:
Link to each other with the ADJ terminal of DC converter HYY behind No. 1, No. 2 terminal short circuits of multiturn potentiometer W, No. 3 terminals of multiturn potentiometer W link to each other with another ADJ terminal of DC converter HYY.DC converter HYY out-put supply positive pole links to each other with an end of resistance R 1, the negative electrode of diode D, the positive pole of 6V power supply voltage stabilizing pilot lamp XD2, the positive pole of capacitor C, the common port COM of measurement range selection (electric current coarse adjustment) K switch 3 respectively; DC converter HYY out-put supply negative pole links to each other with electric current output measurement terminal C2 with the other end of resistance R 1, the anode of diode D, the negative pole of 6V power supply voltage stabilizing pilot lamp XD2, the negative pole of capacitor C respectively.
3. measurement range selection resistance measurement loop feature:
The common port COM of measurement range selection (electric current coarse adjustment) K switch 3 can link to each other with 1 grade (100uA), 2 grades (1mA), 3 grades (10mA), 4 grades (100mA), 5 grades (1A), 6 grades of (10A) terminals respectively by measurement range selection.One end of resistance R 3 links to each other with 1 grade of terminal of measurement range selection (electric current coarse adjustment) K switch 3, and the other end links to each other with the end of resistance R 2, R3 respectively; One end of resistance R 4 links to each other with 2 grades of terminals of measurement range selection (electric current coarse adjustment) K switch 3, and the other end links to each other with the other end of resistance R 9, the end of R10 respectively; One end of resistance R 5 links to each other with 3 grades of terminals of measurement range selection (electric current coarse adjustment) K switch 3, and the other end links to each other with the other end of resistance R 10, the end of R11 respectively; One end of resistance R 6 links to each other with 4 grades of terminals of measurement range selection (electric current coarse adjustment) K switch 3, and the other end links to each other with the other end of resistance R 11, the end of R12 respectively; One end of resistance R 7 links to each other with 5 grades of terminals of measurement range selection (electric current coarse adjustment) K switch 3, and the other end links to each other with the other end of resistance R 12, the end of R13 respectively; One end of resistance R 8 links to each other with 6 grades of terminals of range switch K3, and the other end links to each other with the other end of resistance R 13, the end of R14 respectively.The positive pole of milivoltmeter mV1 links to each other with the other end of resistance R 2, and negative pole links to each other with the other end, the electric current output measurement terminal C1 of resistance R 14 respectively.The positive pole of milivoltmeter mV2 links to each other with normal opened contact one end of measuring button TA, and negative pole links to each other with voltage output measurement terminal P2; The normal opened contact other end of measuring button TA links to each other with voltage output measurement terminal P1.
The principle of work of the fast measurement of inductive winding DC resistance instrument that the present invention relates to is: according to Ohm law R=U/I, when sustaining voltage U is constant, measure resistance in circuit adjusting measurement loop current by changing, measure the direct current resistance of tested winding.The constant pressure source method can realize that the fast theoretical foundation of surveying of resistance is: the length of winding resistance Measuring Time depend on the timeconstant of circuit (τ=L/ (r+r1+r2), because of r＞＞r1+r2, T can think the ratio of inductance value L and resistance r).τ value as high-power transformer is more much bigger than the small transformers, so the time that high-power transformer is measured is quite long, promptly τ is big more, and it is long more to measure required time, otherwise then short more.In order to reduce timeconstant, can in the loop, increase additional resistance r (see figure 2), thereby reach the purpose of quick measurement.
It is the DC converter power supply that the 24V accumulator is adopted in the design of fast measurement of inductive winding DC resistance instrument.The 24V/5V DC converter is the low ripple power supply of high precision, when input voltage fluctuates between 18V～36V, can provide the voltage output of direct current 5V and the electric current output of maximum 15A consistently.The electric current of DC converter output is subjected to the control of its range control switching circuit.With reference to the use convention of various resistance measuring instruments, the measurement of various resistances for convenience, it is a span with 10 times in design that the RKC-10AH type is surveyed instrument soon, has designed 6 range gears (seeing Table 1) altogether.When measuring the different gear of selection, by the different steady current of vernier adjustment knob output.
The charging method of described accumulator:
1. when cell voltage Table V 1 indicated value is lower than 18V, the accumulator electric-quantity deficiency is described, must charges;
2. the selector switch K2 that will charge/measure places " charging " side;
3. charger is inserted charging socket CA, charger power cord is connected the alternating current 220V power supply;
4. the power turn-on K switch 1, and observing cell voltage Table V 1 indicated value should be more than 24V, and battery current indicating gauge A1 is designated as about 1A;
5. during battery charge, the charger signal lamp is shown in red, and charging finishes shown in green;
6. battery charge finishes and cuts off the electricity supply disconnecting power switch K1 and charging/measurement selector switch K2.
In order to make each range measuring resistance roughly the same service time, and reach accuracy class, the fast measurement of inductive winding DC resistance instrument be each range Circuit Design different additional resistance and range resistance.Thereby the effect of additional resistance is to reduce timeconstant to shorten Measuring Time, to measuring accuracy and result without any influence; The effect of the similar voltage divider of range convert resistance, its resistance minimal design are 0.01 Ω and are that the unit multiplying power changes with 10, be convenient to milivoltmeter mV1 reading; Because two milivoltmeter internal resistances are infinitely great, so milivoltmeter mV1 can accurately reflect the size of current that flows through winding L.Making milivoltmeter mV1 displayed value by the voltage output (4.8V-5.8V) of regulating source of stable pressure is integer, and then the winding L both end voltage of milivoltmeter mV2 demonstration can directly reflect the resistance value of winding L, and conversion multiplying power and unit clearly identify on guidance panel.
With range 6 is that example checks: suppose that winding resistance value is 300 Ω, the source of stable pressure VD is 5V, be about 5V ÷ (50000 Ω+1k Ω+300 Ω)=97.47uA by calculating winding current, then the winding L both end voltage is V2=300 Ω * 97.47uA=29.24mV, range convert resistance both end voltage is V1=1k Ω * 97.47uA=97.47mV, can regard loop current value (unit is uA) as merely from numerical value.Because range convert resistance r=1k Ω is an integer, the internal resistance infinity of two mV tables is so the resistance of winding L is the ratio of two mV table numerical value, be R=29.24mV/97.47uA=299.99 Ω, compare with actual value (300 Ω), error is minimum, but resistance value is calculated quite trouble.So for the reading intuitive and convenient, making the mV1 displayed value by the mode regulating loop electric current of adjusting source of stable pressure output voltage (4.8V-5.8V) on circuit design is integer 100 (indication range 99.99～100.01), when mV1 is shown as 99.99, R=mV2/mV1=30mV/99.99uA=300.03 Ω.Absolute error is (300.03-300) ÷ 300=0.01%.Can directly utilize this moment mV2 table displayed value to multiply by the gear multiplying power and carry out reading.
In like manner can demonstrate,prove the accuracy (seeing Table 1) of other each range gear.
When the present invention uses, when it carries out quick measurement of DC resistance to perceptual equipment winding to be tested in the metallurgical industry electrical installation project, adopt following method:
1. the structure of the related device of system of selection according to actual needs, capacity and component parameter configuration: 4NIC-DC75W type constant pressure source, SLA1055-12V/4.5AH type accumulator, the model of two milivoltmeters is respectively MMS-A19A, MMS-A19A, rated current is respectively the fuse of 1.5A and 2.5A, multiturn potentiometer resistance 20k Ω, rated current is the diode D of 10A and the capacitor of 10uF, R1=50k Ω, R2=100k Ω, R3=50k Ω, R4=5k Ω, R5=510 Ω, R6=51 Ω, R7=5 Ω, R8=0.5 Ω, R9=900 Ω, R10=90 Ω, R11=9 Ω, R12=0.9 Ω, R13=0.09 Ω, R14=0.01 Ω.
2. select additional resistance and range convert resistance (seeing Table 2) according to the Standard resistance range of tested perceptual winding: for the Circuit Design of each range different additional resistance and range resistance.Thereby the effect of additional resistance is to reduce timeconstant to shorten Measuring Time, to measuring accuracy and result without any influence; The effect of the similar voltage divider of range convert resistance, its resistance minimal design are 0.01 Ω and are that the unit multiplying power changes with 10, be convenient to milivoltmeter mV1 reading.
3. utilize Ohm law R=U/I to carry out the measurement of DC resistance of inductive winding.Because two milivoltmeter internal resistances are that infinity and range convert resistance resistance are 0.01 Ω * 10
n(n=0,1,2 ... .), so milivoltmeter mV1 can accurately reflect the size of current that flows through winding L.Making milivoltmeter mV1 displayed value by the voltage output (4.8V-5.8V) of regulating source of stable pressure is integer, and then the winding L both end voltage of milivoltmeter mV2 demonstration can directly reflect the resistance value of winding L, and conversion multiplying power and unit clearly identify on guidance panel.
4. survey instrument (Fig. 1) soon according to a cover RKC-10AH type DC resistance of inductive winding of the method for the invention configuration and be example, its concrete measuring method is described:
1) perceptual winding to be tested is pressed tester four terminals (C1, C2 current terminal and P1, P2 voltage terminal) corresponding function wiring;
2) the power turn-on K switch 1, and the selector switch K2 that will charge/measure places " measurement " position;
3) regulate measurement range selection (electric current coarse adjustment) K switch 3 gears and make milivoltmeter mV1 displayed value maximum, regulating multiturn potentiometer W again, to make milivoltmeter mV1 displayed value be integer 100, and mV1 displayed value scope is 99.99～100.01;
4) press survey measurements button TA, read the displayed value of milivoltmeter mV2, this card indication multiplying power with the current selected gear correspondence of measurement range selection (electric current coarse adjustment) switch on duty promptly gets tested DC resistance of inductive winding value (unit is corresponding with gear);
5) measurement finishes, disconnecting power switch K1, and the selector switch of will charging/measure places the position of " breaking ";
6) when two milivoltmeter mV1, mV2 displayed value were zero, promptly dismountable external connection carried out further work.
Subordinate list
The parameter setting and the accuracy of each range gear of table 1
| Gear | Measuring current | The measured resistance value scope | Multiplying power | Unit | Error |
| 6 | 10A | 1～10mΩ | 0.1 | mΩ | 0.01％ |
| 5 | 1A | 10～100mΩ | 1 | mΩ | 0.01％ |
| 4 | 100mA | 100～1000mΩ | 10 | mΩ | 0.01％ |
| 3 | 10mA | 1～10Ω | 0.1 | Ω | 0.01％ |
| 2 | 1mA | 10～100Ω | 1 | Ω | 0.01％ |
| 1 | 100uA | 100～1000Ω | 10 | Ω | 0.01％ |
The configuration of table 2 additional resistance and range convert resistance
| The range gear | Additional resistance | The range convert resistance |
| 1 | R3：50kΩ | R2： |
| 2 | R4：5kΩ | R9：900Ω |
| 3 | R5：510Ω | R10：90Ω |
| 4 | R6：51Ω | R11：9Ω |
| 5 | R7：5Ω | R12：0.9Ω |
| 6 | R8：0.5Ω | R13：0.09Ω |
Claims (4)
1. method of utilizing constant pressure source to realize fast measurement of inductive winding DC resistance, it is characterized in that utilizing the constant pressure source in the fast measurement of inductive winding DC resistance instrument to keep constant operating voltage, Standard resistance range according to perceptual equipment winding to be tested is selected range, measure loop current by the resistance value adjusting that changes range circuit, realize measuring fast, test the speed＜100 seconds; The circuit of described instrument for quick measuring is formed the control circuit that comprises electric supply installation, range circuit, milivoltmeter and constant pressure source,
Specifically be to adopt the method that may further comprise the steps:
(1) structure of the related device of system of selection, capacity and component parameter configuration according to actual needs:
4NIC-DC75W type constant pressure source, SLA1055-12V/4.5AH type accumulator, the model of two milivoltmeters is respectively MMS-A19A, MMS-A19A, and rated current is respectively the fuse of 1.5A and 2.5A, multiturn potentiometer resistance 20k Ω, rated current are the diode D of 10A and the capacitor of 10uF, R1=50k Ω, R2=100k Ω, R3=50k Ω, R4=5k Ω, R5=510 Ω, R6=51 Ω, R7=5 Ω, R8=0.5 Ω, R9=900 Ω, R10=90 Ω, R11=9 Ω, R12=0.9 Ω, R13=0.09 Ω, R14=0.01 Ω
(2) select additional resistance and range convert resistance according to the Standard resistance range of tested perceptual winding:
Scope for each range circuit design additional resistance and range resistance; Thereby the effect of additional resistance is to reduce timeconstant to shorten Measuring Time, to measuring accuracy and result without any influence; The effect of the similar voltage divider of range convert resistance, its resistance minimal design are 0.01 Ω and are that the unit multiplying power changes with 10, are convenient to milivoltmeter mV1 reading,
(3) utilize Ohm law R=U/I to carry out the measurement of DC resistance of inductive winding:
Making milivoltmeter mV1 displayed value by the voltage output of regulating source of stable pressure is integer 100, and then the winding L both end voltage of milivoltmeter mV2 demonstration reflects the resistance value of winding L thereupon, and conversion multiplying power and unit clearly identify on guidance panel; The voltage output range of described source of stable pressure is 4.8～5.8V,
Adopt following measuring method:
1) perceptual equipment winding to be tested is pressed current terminal C1, the C2 of fast measurement of inductive winding DC resistance instrument and voltage terminal P1, the wiring of P2 corresponding function,
2) the power turn-on K switch 1, and the selector switch K2 that will charge/measure places " measurement " position,
3) regulate range switch K3 gear and make milivoltmeter mV1 displayed value maximum, regulating multiturn potentiometer again, to make milivoltmeter mV1 displayed value be 100,
4) press survey measurements button TA, read the displayed value of milivoltmeter mV2, this card indication multiplying power with the current selected gear correspondence of range switch K3 on duty promptly gets tested DC resistance of inductive winding value,
5) measurement finishes, disconnecting power switch K1, and the selector switch of will charging/measure places the position of " breaking ",
6) when two milivoltmeter mV1, mV2 displayed value are zero, remove external connection, carry out further work.
2. method according to claim 1, the model that it is characterized in that described constant pressure source is 4NIC-DC75W.
3. according to the described method of arbitrary claim in the claim 1 to 2, it is characterized in that in the metallurgical industry electrical installation project, perceptual equipment winding to be tested being carried out the application of quick measurement of DC resistance.
4. method according to claim 3 is characterized in that: perceptual equipment winding to be tested comprises large, medium and small type transformer, generator, motor, reactor and mutual inductor.
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| CN102866299B (en) * | 2011-07-08 | 2017-03-15 | 保定市金源科技有限公司 | A kind of DCR of Transformer method of testing |
| CN103293385B (en) * | 2013-05-14 | 2016-03-02 | 国家电网公司 | Transformer temperature rise test quick test device for direct-current resistance |
| CN103308740A (en) * | 2013-06-28 | 2013-09-18 | 河南省电力公司南阳供电公司 | Anti-interference test method for DC (direct current) resistance of shunt reactor of the voltage of 35 kilovolts |
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| CN104714099B (en) * | 2015-04-15 | 2017-07-21 | 王永顺 | A kind of method for the measurement large-scale power transformer D.C. resistance that exceeds the speed limit |
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| CN109557377B (en) * | 2018-12-23 | 2024-04-30 | 武汉职业技术学院 | High-precision direct-current resistance tester |
| CN112162156A (en) * | 2020-09-22 | 2021-01-01 | 广东电网有限责任公司 | Resistance measuring device, resistance measuring method, resistance measuring apparatus, and storage medium |
| CN113777534A (en) * | 2021-08-31 | 2021-12-10 | 浙江大成中孚电力技术发展有限公司 | High-precision measurement device for unbalance rate of marine transformer winding and rapid test method |
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