CN203759193U - Direct-current partial discharge detection device of converter transformer - Google Patents
Direct-current partial discharge detection device of converter transformer Download PDFInfo
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- CN203759193U CN203759193U CN201420175520.1U CN201420175520U CN203759193U CN 203759193 U CN203759193 U CN 203759193U CN 201420175520 U CN201420175520 U CN 201420175520U CN 203759193 U CN203759193 U CN 203759193U
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- partial discharge
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- power transformer
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Abstract
Disclosed is a direct-current partial discharge detection device of a converter transformer. A detection impedor is serially connected in each of a valve winding and a line winding of the converter transformer, impulse voltage on the impedors is monitored, and if polarities of the impulse voltage on the two detection impedors are opposite, a partial discharge signal is considered to exist inside the converter transformer; if the polarities of the impulse voltage on the two detection impedors are identical, an external interference discharge signal is considered. The utility model discloses a direct-current partial discharge measurement technique of the converter transformer, a blank of current direct-current partial discharge detection is filled, interference of the external discharge signal can be eliminated effectively, and the partial discharge signal inside the converter transformer can be separated accurately. The partial discharge signal is further judged by the aid of an electroacoustic combination method. Analysis determination and accurate position of partial signal occurrence are further detected by the aid of ultrasonic waves. By means of electroacoustic combination, effectiveness and reliability of detection are high.
Description
Technical field
The utility model relates to high voltage equipment insulation monitoring field, is a kind of converter power transformer DC partial discharge pick-up unit specifically.
Background technology
Along with the develop rapidly of extra-high voltage direct-current transmission, the insulating property of DC power transmission equipment detect and examination has brought new technical matters.Converter power transformer is one of most crucial DC power transmission equipment, and its insulation is paper oil insulation.If the local defect existing in paper oil insulation, can affect piece electrical intensity, can cause great potential safety hazard to operation, therefore, when putting into operation or overhauling, need carry out insulating property detection to converter power transformer.
Shelf depreciation (putting hereinafter to be referred as office) refers to that certain part in insulating material concentrating because of electric field the electric discharge causing, and this electric discharge phenomena do not run through whole insulation, are reflecting that insulating material exists weak link.By detection office, letting slip the various sound of following in journey, optical, electrical phenomenon, judge whether that existence office puts, is the inner important means that whether has defect of judgement insulation at present.
It is different that the voltage of insulating medium under DC voltage and alternating voltage effect distributes.Therefore,, in direct current electric transmission and transformation system, for simulation actual operating state, need carry out DC voltage withstand test drawn game to converter power transformer and put measurement.
The characteristic parameter of DC Partial Discharge is Apparent discharge magnitude and pulse number, is that situation is put in various phenomenons and the physical quantity office of evaluation of putting generation by the detection office of following.Because DC Partial Discharge pulse recurrence rate is low, individual pulse randomness is strong, and the feature of pulse train is not put in interchange office, so during in-site measurement, anti-interference problem is outstanding, and whether the signal that very difficult judgement detects is real Partial discharge signal.Determine DC Partial Discharge is that on our times, converter power transformer DC Partial Discharge is measured a great problem urgently to be resolved hurrily how authentic and validly.
Summary of the invention
Technical problem to be solved in the utility model is to provide a kind of effective converter power transformer DC partial discharge pick-up unit.
Described converter power transformer DC partial discharge pick-up unit, valve side at described converter power transformer connects high voltage direct current generator, the output terminal voltage divider in parallel of described high pressure generator, it is characterized in that: the sleeve pipe at described converter transformer valve-side two ends is also received the output line of described high voltage direct current generator, the casing short joint at converter power transformer net side two ends, in the valve side of converter power transformer and the bottom shielding of bushing of net side, be connected over the ground respectively the detection impedance of mating with sleeve pipe equivalent capacity, from the output terminal office of sampling of two detection impedances, put respectively the input end of tester.
A kind of consideration compared with the detection impedance embodiment of high s/n ratio and impedance matching is, described detection impedance forms RLC resonant circuit by the armature winding of sleeve pipe equivalent capacity and the first tuning resistor, coupling transformer, by coupling capacitance and coupling transformer, be connected to impedance matching module, and by amplifier output signal, to office, put detector by the output terminal of described impedance matching module.
Further, consider impedance protection, between the elementary two ends of coupling transformer or between the elementary two ends of coupling transformer and ground, be connected with gas-discharge tube.
A kind of embodiment of rlc circuit is, described RLC resonant circuit is by the armature winding of described coupling transformer and connect the first tuning resistor, and one end connects and consists of the equivalent sleeve pipe equivalent capacity of sleeve pipe.
Embodiment as impedance matching, described impedance matching module is provided with second tune resistance, described second tune resistance is in parallel with the secondary winding of coupling transformer, the two ends of described second tune resistance connect two input ends of amplifier, draw the output terminal of impedance matching module by the output terminal of amplifier.
Described second tune resistance is connected with described coupling capacitance by the test tuning resistor being connected in series, the two ends of described test tuning resistor connect calibration input end, and described calibration input end is tested matched impedance for put detector output rate-aided signal by office.
The utility model, by the method that electroacoustic comprehensively judges, polarity judgement combines, is correctly identified the DC Partial Discharge signal of converter power transformer inside, efficiently solves differentiation and the detection of DC Partial Discharge signal.Detect impedance and produce resonance amplification Partial discharge signal by rlc circuit, the parameter of RLC and converter transformer bushings electric capacity match, and make the voltage collecting in impedance be convenient to detect.The utility model also has following remarkable advantage:
(1) disclose a kind of converter power transformer DC Partial Discharge measuring technique, filled up the blank that current DC Partial Discharge detects.
(2) based on pulse current method, be aided with polarity judgement, by detect the pulse voltage polarity in the matching detection impedance of net side, valve side serial connection simultaneously, judge office puts whether occur in converter power transformer inside.This method can effectively be got rid of the interference of external discharge signal, accurately isolates the Partial discharge signal of converter power transformer inside.
(3) utilize the method for electroacoustic combination to do further judgement to Partial discharge signal.When the mode of utilizing pulse current method to be aided with polarity judgement tentatively determines that change of current change inside exists Partial discharge signal, utilize ultrasound wave to do Analysis deterrmination and accurate location that further detection Partial discharge signal occurs.The mode of this acoustic-electric combination, surveys validity and reliability very high.
Accompanying drawing explanation
Whole measuring circuit schematic diagram is put in Fig. 1 In situ DC office,
Fig. 2 is the embodiment circuit diagram of impedance module,
The schematic diagram that Fig. 3 DC Partial Discharge is measured,
Fig. 4 DC Partial Discharge instrument electric power incoming line mode.
In figure: 1-sleeve pipe equivalent capacity, 2-impedance detection input end, 3-coupling capacitance, 4-gas-discharge tube, the 5-the first tuning resistor, 6-coupling transformer, 7-second tune resistance, 8-amplifier, 9-test tuning resistor, 10-calibration input end, 11-high voltage direct current generator, 12-voltage divider, 13-converter power transformer, 14-detecting impedance, tester is put in 15-office.
Embodiment
Below in conjunction with drawings and Examples, the utility model is further illustrated: converter power transformer DC partial discharge pick-up unit as shown in Figure 1, valve side at described converter power transformer 13 connects high voltage direct current generator 11, the output terminal voltage divider 12 in parallel of described high pressure generator 11, high voltage direct current generator is for generation of high direct voltage, and deliver on the valve side two ends sleeve pipe of converter power transformer 13 high direct voltage that voltage divider 12 produces for measuring high pressure generator 11.
The sleeve pipe at described converter power transformer 13 valve side two ends is also received the output line of described high voltage direct current generator 11, the casing short joint at converter power transformer 13 net side two ends, in the valve side of converter power transformer 13 and the bottom shielding of bushing of net side, be connected over the ground respectively the detection impedance 14 of mating with sleeve pipe equivalent capacity 1, from the output terminal office of sampling of two detection impedances 14, put respectively the input end of tester 15.As Fig. 1, Z
1be serially connected between valve side sleeve pipe and ground Z
2be serially connected between net side sleeve pipe and ground; Z
1, Z
2on the discharge signal office of being delivered to that obtains put in detector 15.
A kind of consideration compared with the detection impedance embodiment of high s/n ratio and impedance matching is, as Fig. 2, described detection impedance 14 forms RLC resonant circuit by the armature winding of sleeve pipe equivalent capacity 1 and the first tuning resistor 5, coupling transformer 6, by coupling capacitance 3 and coupling transformer 6, be connected to impedance matching module, and by amplifier 8 output signals, to office, put detector by the output terminal of described impedance matching module.Between between the elementary two ends of the coupling transformer 6 or elementary two ends of coupling transformer 6 and ground, be connected gas-discharge tube 4.To prevent that too high sparking voltage from having damaged detection impedance.A kind of embodiment of rlc circuit is, by the armature winding of described coupling transformer 6 and connect the first tuning resistor 5, one end connects and consists of the equivalent sleeve pipe equivalent capacity 1 of sleeve pipe.This just realizes an embodiment of RLC resonant circuit.
As Fig. 2, embodiment as impedance matching, described impedance matching module is provided with second tune resistance 7, and described second tune resistance 7 is in parallel with the secondary winding of coupling transformer 6, by the two ends of described second tune resistance 7, draws the output terminal of matching module by the output terminal of amplifier 8.Described second tune resistance 7 is connected with described coupling capacitance 3 by the test tuning resistor 9 being connected in series, the two ends of described test tuning resistor 9 connect calibration input end 10, and described calibration input end 10 is tested matched impedance for put detector 15 output rate-aided signals by office.
Utilize said apparatus, utilize pulse current method, on the valve side winding of converter power transformer 13 and net side winding, seal in simultaneously and detect impedance 14, and monitoring detects the pulse voltage in impedance 14, if the pulse voltage polarity detecting in two detection impedances 14 is contrary, think that converter power transformer inside exists Partial discharge signal; If the pulse voltage polarity detecting in two impedances is identical, think outside interference discharge signal.
Its principle as shown in Figure 3, external disturbance electric current (i
1+ i
2) detecting impedance Z
1, Z
2upper generation is pulse signal and transformer valve side cannula C in the same way
1with net side cannula C
2inner shelf depreciation current i
3impedance Z will detected
1, Z
2the reciprocal pulse signal of upper generation.When electric power polarity is timing, C
1in shelf depreciation on Z1, produce positive pulse signal, C
2in shelf depreciation at Z
1upper generation negative pulse signal, high-voltage connection corona, Ce(external disturbance equivalent capacity) in shelf depreciation at Z
1, Z
2upper generation negative pulse signal.Therefore, can judge that pulse signal is from test product inside or outside, test product C by the method
1or C
2.
The judgement of combined echocardiography ripple can improve reliability and the accuracy of judgement to a great extent, when utilizing pulse current method to detect, the ultrasonic probe of at least three offices being put to measurement is contained on the metal shell of described converter power transformer 13 bodies, by the echo signal detecting, is discharged and/or location determination in the position of direct-current discharge.Ultrasonic probe on transformer body, for obtaining good Effect on Detecting, is generally attached to bushing shell for transformer root by sucker paster.If need realize the location of Partial discharge signal, at least need to arrange three ultrasonic probes, with the office of solving, put some three-dimensional coordinate spatially.
Z
1and Z
2by rlc circuit element, formed, need select suitable circuit parameter according to the design of test product electric capacity, make to detect impedance the sensitiveest for the response of high frequency Partial discharge signal.Detect impedance and be serially connected in loop, the pulse current that generation is put in office is flowed through to detect in impedance and can be produced pulse voltage, and this voltage can reflect Partial discharge signal feature, and pulse waveform is put in reproduction office.
The electric power incoming line mode that detector is put in office is as shown in Figure 4: external 220V civil power enters isolating transformer, isolates out the undesired signal in civil power; Then enter wave filter, the humorous wave interference in filter out power; Finally be depressurized to weak electric signal and supply with each hardware circuit module of PD meter.Meanwhile, the ground connection of each hardware circuit is unified receives on unique ground terminal, by this ground terminal one point earth.
Claims (6)
1. a converter power transformer DC partial discharge pick-up unit, valve side at described converter power transformer connects high voltage direct current generator (11), the output terminal voltage divider (12) in parallel of described high pressure generator (11), it is characterized in that: the sleeve pipe at described converter power transformer (13) valve side two ends is also received the output line of described high voltage direct current generator (11), the casing short joint at converter power transformer (13) net side two ends, in the valve side of converter power transformer (13) and the bottom shielding of bushing of net side, be connected over the ground respectively the detection impedance (14) of mating with sleeve pipe equivalent capacity (1), from two output terminal offices of sampling of detecting impedance (14), put the input end of tester (15) respectively.
2. converter power transformer DC partial discharge pick-up unit according to claim 1, it is characterized in that: described detection impedance (14) forms RLC resonant circuit by the armature winding of sleeve pipe equivalent capacity (1) and the first tuning resistor (5), coupling transformer (6), by coupling capacitance (3) and coupling transformer (6), be connected to impedance matching module, and by amplifier (8) output signal, to office, put detector by the output terminal of described impedance matching module.
3. converter power transformer DC partial discharge pick-up unit according to claim 2, is characterized in that: between the elementary two ends of coupling transformer (6) or between the elementary two ends of coupling transformer (6) and ground, be connected with gas-discharge tube (4).
4. converter power transformer DC partial discharge pick-up unit according to claim 2, it is characterized in that: described RLC resonant circuit is by the armature winding of described coupling transformer (6) and connect the first tuning resistor (5), one end connects by the equivalent sleeve pipe equivalent capacity (1) of sleeve pipe and forms.
5. converter power transformer DC partial discharge pick-up unit according to claim 2, it is characterized in that: described impedance matching module is provided with second tune resistance (7), described second tune resistance (7) is in parallel with the secondary winding of coupling transformer (6), the two ends of described second tune resistance (7) connect two input ends of amplifier (8), draw the output terminal of impedance matching module by the output terminal of amplifier (8).
6. converter power transformer DC partial discharge pick-up unit according to claim 5, it is characterized in that: described second tune resistance (7) is connected with described coupling capacitance (3) by the test tuning resistor (9) being connected in series, the two ends of described test tuning resistor (9) connect calibration input end (10), and described calibration input end (10) is tested matched impedance for put detector (15) output rate-aided signal by office.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420175520.1U CN203759193U (en) | 2014-04-10 | 2014-04-10 | Direct-current partial discharge detection device of converter transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420175520.1U CN203759193U (en) | 2014-04-10 | 2014-04-10 | Direct-current partial discharge detection device of converter transformer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103954890A (en) * | 2014-04-10 | 2014-07-30 | 国家电网公司 | DC partial discharge detection device and method for converter transformer |
| CN105929313A (en) * | 2016-06-01 | 2016-09-07 | 国网河北省电力公司电力科学研究院 | Hollow coil sensor for high-voltage equipment partial discharge measurement |
| CN112763872A (en) * | 2021-01-17 | 2021-05-07 | 国网辽宁省电力有限公司电力科学研究院 | Acoustic-electric combined novel transformer partial discharge detection impedance |
-
2014
- 2014-04-10 CN CN201420175520.1U patent/CN203759193U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103954890A (en) * | 2014-04-10 | 2014-07-30 | 国家电网公司 | DC partial discharge detection device and method for converter transformer |
| CN103954890B (en) * | 2014-04-10 | 2017-02-15 | 国家电网公司 | DC partial discharge detection device and method for converter transformer |
| CN105929313A (en) * | 2016-06-01 | 2016-09-07 | 国网河北省电力公司电力科学研究院 | Hollow coil sensor for high-voltage equipment partial discharge measurement |
| CN112763872A (en) * | 2021-01-17 | 2021-05-07 | 国网辽宁省电力有限公司电力科学研究院 | Acoustic-electric combined novel transformer partial discharge detection impedance |
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