CN104330662A - Testing device and testing method for direct-current magnetic bias of converter transformer - Google Patents
Testing device and testing method for direct-current magnetic bias of converter transformer Download PDFInfo
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Abstract
The invention relates to a testing device and a testing method for direct-current magnetic bias of a converter transformer. The testing device for the direct-current magnetic bias of the converter transformer comprises a direct-current power supply, a variable resistor Rw, a current-limiting reactor L, a capacitor, a current divider, a direct-current voltage meter, a discharging resistor RF, a buzzer, a universal transfer switch SA, an alternating-current voltage meter, a semiconductor discharging tube. Main performance parameters of the converter transformer in a no-load state or load state are tested, relationships among the main performance parameters of the converter transformer and direct-current magnetic bias current size are analyzed, the capacity of the converter transformer bearing the direct-current magnetic bias is verified, and measures are timely taken, so that the converter transformer safely and stably runs. The testing method simulates and tests the running condition of the converter transformer when the direct-current magnetic bias is generated in the no-load state or load state in a laboratory, so that the endurance capacity of the direct-current magnetic bias of the converter transformer can be possibly verified in the laboratory.
Description
Technical field
The present invention relates to test unit and the method for the converter transformer DC magnetic bias in power industry high-voltage test techniques field, be specially a kind of DC magnetic biasing for injecting DC current to converter power transformer source side winding neutral point and add stream device, belong to the test unit of converter transformer DC magnetic bias and the innovative technology of method.
Background technology
Converter power transformer is in actual moving process, owing to being subject to the impact of DC transmission system, inevitably by certain DC current in its winding, thus cause DC magnetic biasing unshakable in one's determination, cause the obvious increase of converter power transformer no-load current, open circuit loss, noise, vibration, and certain impact is produced on its performance such as load loss, temperature rise.Therefore, be necessary very much to work out a kind of test method of carrying out converter transformer DC magnetic bias in testing laboratory, Specifeca tion speeification under its unloaded shape body or load condition is tested, analyze the relation between converter power transformer Specifeca tion speeification and DC magnetic bias current size, checking converter power transformer bears the ability of DC magnetic biasing.
Summary of the invention
In order to solve problems of the prior art, the invention provides a kind of DC magnetic biasing and adding stream device, the present invention is used for injecting DC current to converter power transformer source side winding neutral point.
Present invention also offers corresponding test method.Present invention achieves the simulation test that DC magnetic biasing operating condition occurs under testing laboratory is to converter power transformer zero load or load condition, make to become a kind of possibility at the tolerance of testing laboratory's checking converter transformer DC magnetic bias.
The present invention is achieved through the following technical solutions: the test unit of converter transformer DC magnetic bias of the present invention, includes direct supply, rheostat Rw, current limiting reactor L, capacitor, shunt, D.C. voltmeter, discharge resistance RF, hummer, universal seclector SA, A.C. voltmeter, semiconductor discharge tube, wherein 3. the positive pole of direct supply passes through the contact of universal seclector SA, 4., 7. be connected with one end of rheostat Rw, the other end of rheostat Rw is connected with one end of current limiting reactor L, the other end of current limiting reactor L is connected with shunt, D.C. voltmeter is connected in parallel on the two ends of shunt, capacitor is attempted by between the negative pole of direct supply and current limiting reactor L, and 1. capacitor passes through the contact of universal seclector SA, 2. be connected with the negative pole of direct supply, one end of discharge resistance RF and the negative pole of direct supply, one end of hummer and one end of semiconductor discharge tube connect, the other end of discharge resistance RF and the other end of hummer are connected with one end of A.C. voltmeter, the other end of A.C. voltmeter is connected with the other end of semiconductor discharge tube and shunt, and the contact of universal seclector SA 5., 6., 8. A.C. voltmeter two ends are attempted by.
The test method of the test unit of converter transformer DC magnetic bias of the present invention, the converter transformer DC magnetic bias test loop be made up of the test unit of converter transformer DC magnetic bias includes a converter power transformer, a DC magnetic biasing adds stream device, two semipilot transformer B1 and B2, DC magnetic biasing adds stream device and is connected with converter power transformer and semipilot transformer B1 respectively, semipilot transformer B1 is connected with generator by semipilot transformer B2
Test method comprises the steps:
1) before whole test loop is for energising, the rheostat Rw first DC magnetic biasing added in stream device places maximum, universal seclector SA is selected to drop into again, standardsizing rheostat Rw gradually, monitoring D.C. voltmeter, make the DC current of the tested converter power transformer source side winding of injection reach testing requirements value, this needs the stabilization process of certain hour;
2) after the DC current of examination converter power transformer source side winding reaches testing requirements value, start progressively to apply alternating voltage to test loop, in the process, monitor that direct current adds the ruuning situation of stream device, there are any abnormal conditions, cut off AC power immediately, the safety of warranty test personnel and equipment, when ac test voltage reaches testing requirements value, carry out the measurement of the various performance parameter of converter power transformer, after test, first alternating voltage is progressively reduced to minimum, cut off alternating voltage, universal seclector SA is selected to cut off and then, discharged fully in test loop, until after hummer no longer reports to the police, with high pressure Special grounding rod, discharged again in capacitor two ends, the residual charge in complete Elimination test loop.
The converter transformer DC magnetic bias test loop be made up of the test unit of converter transformer DC magnetic bias of the present invention includes a converter power transformer, a DC magnetic biasing adds stream device, two semipilot transformer B1 and B2, DC magnetic biasing adds stream device and is connected with converter power transformer and semipilot transformer B1 respectively, semipilot transformer B1 is connected with generator by semipilot transformer B2, and test method comprises following test:
1) routine measurement
11) under light condition
In above-mentioned test loop, do not drop into DC magnetic biasing add stream device, converter transformer valve-side is bringing onto load not, alternating voltage is applied from net side, respectively at 0.1 ~ 1.1Ur(interval 0.1) under measure field voltage, no-load current, no-load current harmonic wave, open circuit loss, iron core and clamp earthing current, respectively at 0.8 ~ 1.1Ur(interval 0.1) under measure sound level, fuel tank wall vibrations, record field voltage, no-load current waveform with oscillograph simultaneously, to sound level, vibration carry out spectrum analysis;
12) under load condition
In above-mentioned test loop, do not drop into DC magnetic biasing add stream device, converter transformer valve band one fixed load (selecting according to concrete test condition), alternating voltage is applied from net side, respectively at 0.1 ~ 1.1Ur(interval 0.1) under measure apply voltage, electric current, current harmonics, loss, iron core and clamp earthing current, respectively at 0.8 ~ 1.1Ur(interval 0.1) under measure sound level, fuel tank wall vibrations, record with oscillograph simultaneously and apply voltage, current waveform, spectrum analysis is carried out to sound level, vibration, by thermal imaging system observation tank surface hot(test)-spot temperature;
2) measure under DC magnetic biasing
21) under light condition
Converter transformer valve-side not bringing onto load in above-mentioned test loop, drop into DC magnetic biasing and add stream device, respectively to converter power transformer source side winding inject DC current 2,4,6,8,10A, alternating voltage is applied from net side, field voltage, no-load current, no-load current harmonic wave, open circuit loss is measured respectively under 0.1 ~ 1.1Ur, iron core and clamp earthing current, sound level, fuel tank wall vibrations is measured respectively under 0.8 ~ 1.1Ur, record field voltage, no-load current waveform with oscillograph simultaneously, spectrum analysis is carried out to sound level, vibration;
22) under load condition
Converter transformer valve-side band one fixed load (selecting according to concrete test condition) in above-mentioned test loop, drop into DC magnetic biasing and add stream device, respectively DC current 2 is injected to converter power transformer source side winding, 4, 6, 8, 10A, alternating voltage is applied from net side, measure under 0.1 ~ 1.1Ur respectively and apply voltage, electric current, current harmonics, loss, iron core and clamp earthing current, sound level is measured respectively under 0.8 ~ 1.1Ur, fuel tank wall vibrations, record applying voltage with oscillograph simultaneously, current waveform, to sound level, spectrum analysis is carried out in vibration, by thermal imaging system observation tank surface hot(test)-spot temperature, oil chromatogram analysis is carried out respectively before and after routine measurement and DC magnetic biasing are measured.
The test unit of converter transformer DC magnetic bias of the present invention is tested the Specifeca tion speeification under its unloaded shape body or load condition, analyze the relation between converter power transformer Specifeca tion speeification and DC magnetic bias current size, checking converter power transformer bears the ability of DC magnetic biasing, takes measures timely thus ensures the safe and stable operation of converter power transformer.Test method of the present invention achieves the simulation test that DC magnetic biasing operating condition occurs under testing laboratory is to converter power transformer zero load or load condition, and making becomes a kind of possibility at the tolerance of testing laboratory's checking converter transformer DC magnetic bias.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that DC magnetic biasing of the present invention adds stream device;
Fig. 2 is the schematic diagram of existing converter transformer DC magnetic bias test loop;
Fig. 3 is the schematic diagram of converter transformer DC magnetic bias test loop of the present invention.
Embodiment
DC magnetic biasing for injecting from DC current to converter power transformer source side winding neutral point of the present invention adds the schematic diagram of stream device as shown in Figure 1, includes direct supply, rheostat Rw, current limiting reactor L, capacitor, shunt, D.C. voltmeter, discharge resistance RF, hummer, universal seclector SA, A.C. voltmeter, semiconductor discharge tube, wherein 3. the positive pole of direct supply passes through the contact of universal seclector SA, 4., 7. be connected with one end of rheostat Rw, the other end of rheostat Rw is connected with one end of current limiting reactor L, the other end of current limiting reactor L is connected with shunt, D.C. voltmeter is connected in parallel on the two ends of shunt, capacitor is attempted by between the negative pole of direct supply and current limiting reactor L, and 1. capacitor passes through the contact of universal seclector SA, 2. be connected with the negative pole of direct supply, one end of discharge resistance RF and the negative pole of direct supply, one end of hummer and one end of semiconductor discharge tube connect, the other end of discharge resistance RF and the other end of hummer are connected with one end of A.C. voltmeter, the other end of A.C. voltmeter is connected with the other end of semiconductor discharge tube and shunt, and the contact of universal seclector SA 5., 6., 8. A.C. voltmeter two ends are attempted by.
Add stream device by the DC magnetic biasing shown in Fig. 1, at least can inject the DC current of 10A to converter power transformer (during rated no-load state) source side winding.According to the load-carrying size of converter power transformer, by increasing the number of units in parallel of capacitor, this DC magnetic biasing adds stream device also can inject at least 10A under DC current from converter power transformer load condition to its source side winding.
Wherein, in Fig. 1 the effect of various components and parts and Selecting parameter as follows:
1) direct supply: inject DC current to test loop, general selection 24V accumulator.
2) rheostat Rw: the size regulating test loop DC current, resistance 0 ~ 10 Ω, power >=2000W.
3) current limiting reactor L: limit value flows through the alternating current of DC power supply circuit, rated frequency 50Hz, rated impedance >=60 Ω, direct current resistance≤1 Ω, rated current >=30A.
4) shunt and D.C. voltmeter: the DC experiment electric current in monitoring test loop, shunt 50A ~ 500A/75mV, D.C. voltmeter 75mV.
5) capacitor: provide alternating current path, can select multiple stage capacitor in parallel, rated frequency 50Hz, capacitive reactance≤6 Ω, rated voltage 400V.
6) discharge resistance RF and hummer: after off-test, carries out direct-current discharge to test loop, and carries out auditory tone cues, discharge resistance RF resistance 500 Ω, power 1kW.
7) universal seclector SA: the break-make of Control experiment loop and discharge loop, rated current >=30A, point two conversion directions: drop into, cut off, during input: 1.-2., 3.-4. lead to, 5.-6., 7.-8. break, during cut-out: 1.-2., 3.-4. break, 5.-6., 7.-8. lead to.
8) A.C. voltmeter: monitoring direct current adds the alternating voltage at stream device output terminal two ends, range 600V.
9) semiconductor discharge tube: there is fortuitous event in process of the test under, protection direct current adds stream device, avoids superpotential to add stream device to direct current and causes damage.
Large-sized converter transformer is generally single transformer, common DC magnetic biasing loop is the converter power transformer that selection two specifications and models are the same, net side is in parallel, power from a deck valve side, another deck valve side open circuit (light condition) or band one fixed load (load condition), as shown in Figure 2, DC magnetic biasing adds stream device serial connection between two converter power transformer net side neutrality, injects DC current to two converter power transformer source side winding simultaneously., there is following major defect in this kind of DC magnetic biasing test loop:
One is the converter power transformer of needs two same size models, takies test space larger; In addition, two converter power transformers all produce identical DC magnetic bias phenomena, bring difficulty and impact to the various performance parameters (especially noise) measured under converter transformer DC magnetic bias.
For overcoming the shortcoming of Fig. 2 DC magnetic biasing test loop, the present invention designs converter transformer DC magnetic bias test loop as shown in Figure 3.This test loop includes a converter power transformer, a DC magnetic biasing adds stream device, two semipilot transformer B1 and B2, DC magnetic biasing adds stream device and is connected with converter power transformer and semipilot transformer B1 respectively, semipilot transformer B1 is connected with generator by semipilot transformer B2, this test loop only needs a converter power transformer, and the rated voltage high (at least twice) far away of semipilot transformer B1 is in tested converter power transformer rated voltage.During test, the DC magnetic biasing of intermediate transformer B1 far below tested converter power transformer, can effectively Elimination test equipment on the impact of test specimen performance parameter measurement result.
The present invention is before whole test loop is for energising, the rheostat Rw first DC magnetic biasing added in stream device places maximum, universal seclector SA is selected to drop into again, standardsizing rheostat Rw gradually, monitoring D.C. voltmeter, make the DC current of the tested converter power transformer source side winding of injection reach testing requirements value, this needs the stabilization process of certain hour.
After the DC current of examination converter power transformer source side winding reaches testing requirements value, can start progressively to apply alternating voltage to test loop, in the process, the ruuning situation that direct current adds stream device should be paid close attention to, there are any abnormal conditions, AC power should be cut off immediately, the safety of warranty test personnel and equipment.When ac test voltage reaches testing requirements value, carry out the measurement of the various performance parameter of converter power transformer, after test, first progressively reduce alternating voltage to minimum, cut off alternating voltage, select universal seclector SA to cut off and then, discharged fully in test loop, until after hummer no longer reports to the police, with high pressure Special grounding rod, discharged again in capacitor two ends, the residual charge in complete Elimination test loop.
The test method of the test unit of converter transformer DC magnetic bias of the present invention, comprises following test:
1) routine measurement
11) under light condition
Wiring is carried out by Fig. 3 test loop, do not drop into DC magnetic biasing and add stream device, converter transformer valve-side is bringing onto load not, alternating voltage is applied from net side, respectively at 0.1 ~ 1.1Ur(interval 0.1) under measure field voltage, no-load current, no-load current harmonic wave, open circuit loss, unshakable in one's determination and clamp earthing current, respectively at 0.8 ~ 1.1Ur(interval 0.1) under measure sound level, fuel tank wall vibrations.Record field voltage, no-load current waveform with oscillograph simultaneously, spectrum analysis is carried out to sound level, vibration.
12) under load condition
Wiring is carried out by Fig. 3 test loop, do not drop into DC magnetic biasing and add stream device, converter transformer valve band one fixed load (selecting according to concrete test condition), alternating voltage is applied from net side, respectively at 0.1 ~ 1.1Ur(interval 0.1) under measure apply voltage, electric current, current harmonics, loss, unshakable in one's determination and clamp earthing current, respectively at 0.8 ~ 1.1Ur(interval 0.1) under measure sound level, fuel tank wall vibrations.Record with oscillograph simultaneously and apply voltage, current waveform, spectrum analysis is carried out to sound level, vibration, by thermal imaging system observation tank surface hot(test)-spot temperature.
2) measure under DC magnetic biasing
21) under light condition
Wiring is carried out by Fig. 3 test loop, converter transformer valve-side is bringing onto load not, drop into DC magnetic biasing and add stream device, respectively to converter power transformer source side winding inject DC current 2,4,6,8,10A(is according to concrete test condition, the DC current applied can be larger), alternating voltage is applied from net side, respectively at 0.1 ~ 1.1Ur(interval 0.1) under measure field voltage, no-load current, no-load current harmonic wave, open circuit loss, unshakable in one's determination and clamp earthing current, respectively at 0.8 ~ 1.1Ur(interval 0.1) under measure sound level, fuel tank wall vibrations.Record field voltage, no-load current waveform with oscillograph simultaneously, spectrum analysis is carried out to sound level, vibration.
22) under load condition
Wiring is carried out by Fig. 3 test loop, converter transformer valve-side band one fixed load (selecting according to concrete test condition), drop into DC magnetic biasing and add stream device, respectively DC current 2 is injected to converter power transformer source side winding, 4, 6, 8, 10A(is according to concrete test condition, the DC current applied can be larger), alternating voltage is applied from net side, respectively at 0.1 ~ 1.1Ur(interval 0.1) under measure apply voltage, electric current, current harmonics, loss, iron core and clamp earthing current, respectively at 0.8 ~ 1.1Ur(interval 0.1) under measure sound level, fuel tank wall vibrations.Record with oscillograph simultaneously and apply voltage, current waveform, spectrum analysis is carried out to sound level, vibration, by thermal imaging system observation tank surface hot(test)-spot temperature.
Oil chromatogram analysis is carried out respectively before and after routine measurement and DC magnetic biasing are measured.
Claims (3)
1. a test unit for converter transformer DC magnetic bias, is characterized in that including direct supply, rheostat Rw, current limiting reactor L, capacitor, shunt, D.C. voltmeter, discharge resistance RF, hummer, universal seclector SA, A.C. voltmeter, semiconductor discharge tube, wherein 3. the positive pole of direct supply passes through the contact of universal seclector SA, 4., 7. be connected with one end of rheostat Rw, the other end of rheostat Rw is connected with one end of current limiting reactor L, the other end of current limiting reactor L is connected with shunt, D.C. voltmeter is connected in parallel on the two ends of shunt, capacitor is attempted by between the negative pole of direct supply and current limiting reactor L, and 1. capacitor passes through the contact of universal seclector SA, 2. be connected with the negative pole of direct supply, one end of discharge resistance RF and the negative pole of direct supply, one end of hummer and one end of semiconductor discharge tube connect, the other end of discharge resistance RF and the other end of hummer are connected with one end of A.C. voltmeter, the other end of A.C. voltmeter is connected with the other end of semiconductor discharge tube and shunt, and the contact of universal seclector SA 5., 6., 8. A.C. voltmeter two ends are attempted by.
2. the test method of the test unit of a converter transformer DC magnetic bias, it is characterized in that the converter transformer DC magnetic bias test loop be made up of the test unit of converter transformer DC magnetic bias includes a converter power transformer, a DC magnetic biasing adds stream device, two semipilot transformer B1 and B2, DC magnetic biasing adds stream device and is connected with converter power transformer and semipilot transformer B1 respectively, semipilot transformer B1 is connected with generator by semipilot transformer B2
Test method comprises the steps:
1) before whole test loop is for energising, the rheostat Rw first DC magnetic biasing added in stream device places maximum, universal seclector SA is selected to drop into again, standardsizing rheostat Rw gradually, monitoring D.C. voltmeter, make the DC current of the tested converter power transformer source side winding of injection reach testing requirements value, this needs the stabilization process of certain hour;
2) after the DC current of examination converter power transformer source side winding reaches testing requirements value, start progressively to apply alternating voltage to test loop, in the process, monitor that direct current adds the ruuning situation of stream device, there are any abnormal conditions, cut off AC power immediately, the safety of warranty test personnel and equipment, when ac test voltage reaches testing requirements value, carry out the measurement of the various performance parameter of converter power transformer, after test, first alternating voltage is progressively reduced to minimum, cut off alternating voltage, universal seclector SA is selected to cut off and then, discharged fully in test loop, until after hummer no longer reports to the police, with high pressure Special grounding rod, discharged again in capacitor two ends, the residual charge in complete Elimination test loop.
3. the test method of the test unit of converter transformer DC magnetic bias according to claim 2, it is characterized in that the converter transformer DC magnetic bias test loop be made up of the test unit of converter transformer DC magnetic bias includes a converter power transformer, a DC magnetic biasing adds stream device, two semipilot transformer B1 and B2, DC magnetic biasing adds stream device and is connected with converter power transformer and semipilot transformer B1 respectively, semipilot transformer B1 is connected with generator by semipilot transformer B2, and test method comprises following test:
1) routine measurement
11) under light condition
In above-mentioned test loop, do not drop into DC magnetic biasing add stream device, converter transformer valve-side is bringing onto load not, alternating voltage is applied from net side, respectively at 0.1 ~ 1.1Ur(interval 0.1) under measure field voltage, no-load current, no-load current harmonic wave, open circuit loss, iron core and clamp earthing current, respectively at 0.8 ~ 1.1Ur(interval 0.1) under measure sound level, fuel tank wall vibrations, record field voltage, no-load current waveform with oscillograph simultaneously, to sound level, vibration carry out spectrum analysis;
12) under load condition
In above-mentioned test loop, do not drop into DC magnetic biasing add stream device, converter transformer valve band one fixed load (selecting according to concrete test condition), alternating voltage is applied from net side, respectively at 0.1 ~ 1.1Ur(interval 0.1) under measure apply voltage, electric current, current harmonics, loss, iron core and clamp earthing current, respectively at 0.8 ~ 1.1Ur(interval 0.1) under measure sound level, fuel tank wall vibrations, record with oscillograph simultaneously and apply voltage, current waveform, spectrum analysis is carried out to sound level, vibration, by thermal imaging system observation tank surface hot(test)-spot temperature;
2) measure under DC magnetic biasing
21) under light condition
Converter transformer valve-side not bringing onto load in above-mentioned test loop, drop into DC magnetic biasing and add stream device, respectively to converter power transformer source side winding inject DC current 2,4,6,8,10A, alternating voltage is applied from net side, field voltage, no-load current, no-load current harmonic wave, open circuit loss is measured respectively under 0.1 ~ 1.1Ur, iron core and clamp earthing current, sound level, fuel tank wall vibrations is measured respectively under 0.8 ~ 1.1Ur, record field voltage, no-load current waveform with oscillograph simultaneously, spectrum analysis is carried out to sound level, vibration;
22) under load condition
Converter transformer valve-side band one fixed load (selecting according to concrete test condition) in above-mentioned test loop, drop into DC magnetic biasing and add stream device, respectively DC current 2 is injected to converter power transformer source side winding, 4, 6, 8, 10A, alternating voltage is applied from net side, measure under 0.1 ~ 1.1Ur respectively and apply voltage, electric current, current harmonics, loss, iron core and clamp earthing current, sound level is measured respectively under 0.8 ~ 1.1Ur, fuel tank wall vibrations, record applying voltage with oscillograph simultaneously, current waveform, to sound level, spectrum analysis is carried out in vibration, by thermal imaging system observation tank surface hot(test)-spot temperature, oil chromatogram analysis is carried out respectively before and after routine measurement and DC magnetic biasing are measured.
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| CN105450007A (en) * | 2015-12-09 | 2016-03-30 | 中国电力科学研究院 | Power supply for direct current magnetic biasing tests on transformers |
| CN105467241A (en) * | 2015-12-08 | 2016-04-06 | 国家电网公司 | A distributed converter transformer direct current bias detection system and a detection method thereof |
| CN106872789A (en) * | 2015-12-14 | 2017-06-20 | 中国电力科学研究院 | A kind of harmonic loss measurement apparatus of converter power transformer |
| CN107870270A (en) * | 2016-09-27 | 2018-04-03 | 广州西门子变压器有限公司 | The D.C. magnetic biasing test equipment of transformer |
| CN109239484A (en) * | 2018-07-28 | 2019-01-18 | 中国南方电网有限责任公司 | A kind of converter power transformer equivalent model test method |
| CN109491243A (en) * | 2018-11-16 | 2019-03-19 | 国网福建省电力有限公司电力科学研究院 | A kind of external dc bias of reverse current injection inhibits the fuzzy control method of device |
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| CN114019286A (en) * | 2021-11-05 | 2022-02-08 | 国网四川省电力公司经济技术研究院 | Transformer direct-current magnetic bias tolerance checking field test method and system |
| CN117113733A (en) * | 2023-10-24 | 2023-11-24 | 国家电网有限公司西北分部 | Method and device for acquiring bias current of direct current near zone of power grid |
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