CN105974290A - Dry type air reactor turn-to-turn insulation performance detection system and method - Google Patents

Abstract

The invention discloses a dry type air reactor turn-to-turn insulation performance detection system and method. The system comprises a high-voltage switch cabinet, a variable-frequency test power supply, a test transformer, a reactive power compensation unit, a partial discharge monitoring unit and a tested product unit. 380V three-phase AC current is accessed to the high-voltage switch cabinet. The high-voltage switch cabinet, the variable-frequency test power supply, the test transformer, the reactive power compensation unit, the partial discharge monitoring unit and the tested product unit are connected in turn. The partial discharge monitoring unit comprises a coupling capacitor, measurement impedance and a partial discharge tester. The test product unit comprises a dry type air reactor and an AC voltage measurement unit. The dry type air reactor and the AC voltage measurement unit are connected in parallel. The test transformer excites a resonant loop. The reactive power compensation unit and the tested product unit in the loop are enabled to generate parallel resonance through output frequency of the variable-frequency test power supply. Onsite induced voltage withstanding testing can be performed on the 35kV dry type air reactor so that onsite voltage boosting operation of the reactor can be completed.

Description

A kind of dry-type air-core reactor turn-to-turn insulation performance detecting system and method

Technical field

The present invention relates to dry-type air-core reactor technical field, be specifically related to a kind of dry-type air-core reactor turn-to-turn Insulating properties detecting system and method.

Background technology

Along with the development of China's electric utility, for how improving power supply quality and power supply reliability, The major issue considered through becoming electric power system to need.Reactive power compensator plays in terms of improving power supply quality Important function, was developed rapidly in recent years；And be ensure power supply reliability, it is ensured that transformator from Short-circuit current rush, short-circuit current limiting device is also used widely.

Dry-type air-core reactor as the typical equipments in reactive power compensator and short-circuit current limiting device, Owing to it has, loss is little, noise is low, maintenance workload is little, be not susceptible to phase fault, reactance value The advantages such as the linearity is good, length projected life, are widely used in domestic and international grid equipment in recent years.Power train The reactor that system is taked common are shunt reactor and current-limiting reactor.Shunt reactor is used for absorption circuit Capacitive reactive power, play the effect improving Power System Reactive Power；Current-limiting reactor is then mainly used to limit Short circuit current, or by limiting the higher hamonic wave in electrical network with capacitor serial or parallel connection.

Along with dry-type air-core reactor large-scale application in electrical network, owing to the various defects of reactor cause Accident the most inevitably occur, in reactor defect statistics, have found that turn-to-turn insulation causes short Fault proportion in various defects in road is the highest, close to half.Most Reactor Faults are that turn-to-turn short circuit is drawn Play reactor catching fire, bring the biggest impact to the safe and stable operation of power system.

For the detection experimental study of dry-type air-core reactor turn-to-turn insulation, the research method of domestic scholars is substantially On can be divided into following several: one is induced over voltage withstand test method, and reactor two ends are directly applied by the method Power-frequency voltage, with reactor actual operating state closest to, can effectively examine reactor turn-to-turn insulation to tolerate The ability of overvoltage, but needed for the method, reactive power is very big, is difficult to have assay device can meet when testing Capacity requirement, so that the method is extremely restricted.One is lightning impulse voltage test method, due to sense Answering the limitation of pressure test method, the method is used as the tolerance energy of examination reactor turn-to-turn insulation by substituting Power, but the method is comparatively short for action time, and energy is relatively low, and visual examination difficulty distinguishes, and turn-to-turn short circuit is drawn The electrical quantity variable quantity risen is little, is also difficult to distinguish from lightning impulse waveform.

Also having one is high-frequency impulse succusion, and the research of the method occurs hitting in turn-to-turn insulation based on reactor Reactor Parameters variation phenomenon when wearing short circuit, on reactor apply high frequency voltage, contrast normal reactor and Fault reactance device presents different attenuation constants to applying voltage, thus judges the turn-to-turn insulation shape of reactor State, the method is only effective to reactor inter-turn insulation defect occurred, and hidden to there is turn-to-turn insulation Suffer from and do not occur the reactor of insulation breakdown then cannot realize detection function.Publication No. CN105445630 A kind of dry-type air-core reactor turn-to-turn insulation test device, including input module, dry-type air-core reactor, Observation circuit, MCU system, current foldback circuit, bus module, display module, signal switch, Number/change-over circuit, input operation module；Observation circuit includes electric voltage observation circuit, reactive current monitoring electricity Road, watt current observation circuit, power factor (PF) observation circuit, input module includes pressure regulator, high-voltage pulse Circuit, high-frequency oscillating circuits, dry-type air-core reactor input connects high-frequency oscillating circuits, and outfan connects Reactive current observation circuit, watt current observation circuit, power factor (PF) observation circuit.

Therefore, the dry-type air-core reactor turn-to-turn insulation research experiment under the conditions of difference being used, it is achieved The Site Detection of dry-type air-core reactor turn-to-turn insulation, just seem ever more important.

Summary of the invention

In view of this, it is an object of the invention to for the deficiencies in the prior art, it is provided that a kind of dry-type hollow reactance Device turn-to-turn insulation performance detecting system and method, it is possible to 35 kilovolts of dry-type air-core reactor scenes are felt Answer pressure test, complete the on-the-spot boost operations to reactor.

For solving above-mentioned technical problem, the technical solution used in the present invention is as follows:

A kind of dry-type air-core reactor turn-to-turn insulation performance detecting system, wherein, including high-tension switch cabinet, change Frequently experiment power supply, testing transformer, reactive power compensation unit, partial discharge monitoring unit and test specimen list Unit, described high-tension switch cabinet accesses 380V three-phase alternating current, described high-tension switch cabinet, frequency conversion test electricity Source, testing transformer, reactive power compensation unit, partial discharge monitoring unit, test specimen unit connect successively Connect；Described partial discharge monitoring unit includes coupling electric capacity, measuring impedance and instrument for measuring partial discharge, described Tested article unit includes dry-type air-core reactor and ac voltage measurement unit, described dry-type air-core reactor and Ac voltage measurement unit is in parallel；Described testing transformer excites resonant tank, defeated by frequency conversion experiment power supply Going out frequency makes the reactive power compensation unit in loop produce parallel resonance with test specimen unit.

Preferably, series current table in the high tension loop of described testing transformer.

Preferably, described reactive power compensation unit uses oil immersed type intensive compensation Capacitor banks.

Preferably: described reactive power compensation unit is composed in series by multiple Capacitor banks, described electric capacity Device group is composed in parallel by branched capacitor.

Preferably, described testing transformer is exciting transformer.

A kind of dry-type air-core reactor turn-to-turn insulation method for testing performance, wherein, comprises the steps:

1) calculate according to field device parameters, select reactive power compensator switching quantity, pass through dry type Air reactor parameter calculates on-the-spot test voltage value U, according to the rated voltage level calculation of 1.3 times, I.e. U=U_L* 1.3, U_LRepresent dry-type air-core reactor rated operational voltage；

2) according to frequency conversion experiment power supply rated output voltage frequency range, it is considered in the case of full remuneration, Selection reactive power compensation cell capacitance amount:

$C=\frac{1}{L\×{\left(2\mathrm{\π}f\right)}^2};$

Wherein, C: compensate condenser capacity；L: tested air reactor inductance value；F: test frequency；

3) the electric current I of overcompensation Capacitor banks dirty to test voltage_CCalculate:

$I_C=\frac{U}{1/j\mathrm{\ω}C}=jU\mathrm{\ω}C;$

Wherein, Ic: compensate condenser current；U: test voltage value；W: angular frequency；

4) the electric current I of convection current overtesting transformator₂Calculate:

$I_2=I_L+I_C=j(U\mathrm{\ω}C-\frac{U}{2\mathrm{\π}fL});$

Wherein, I₂: testing transformer electric current；I_L: tested dry-type air-core reactor electric current；Ic: compensate electricity Condenser current；U: test voltage value；F: test frequency；

5) to electric current I_C、I₂Numerical value be analyzed, parallel capacitor and the technology of testing transformer Whether parameter meets requirement；

6) preview is calculated complete, field equipment connecting, carry out the turn-to-turn insulation performance of dry-type air-core reactor Certification test.

Preferably, described step 6) comprise the steps:

Select suitably to compensate Capacitor banks according to calculating data and test specimen parameter, and connect whole test Pressurizing loop；

Coupling capacitor connects detection impedance, Partial Discharge Detection signal cable and shelf depreciation inspection Survey instrument；

According to square wave calibration procedure, utilize verification squaring device in dry-type air-core reactor turn-to-turn insulation performance Carry out the square wave calibration of 500pC in detecting system, and observe background noise；

Power turn-on switchs, and slowly carries out voltage rising, simultaneously monitoring current value carrying out with result of calculation Contrast；

After off-test, directly by near for voltage 0V, and cut off the electricity supply.

Preferably, described slowly carry out voltage rising, including:

First boost to 0.5 times of U, observe partial discharge quantity persistently 1 minute, without exception, continue to boost To 0.8 times of U, observe partial discharge quantity persistently 1 minute, without exception, directly boost to U, and persistently 1 minute record partial discharge quantity.

The invention has the beneficial effects as follows:

1) present invention can carry out induced over voltage withstand test to dry-type air-core reactor scene, completes on-the-spot to electricity The examination of anti-device turn-to-turn insulation；

2) needed for the present invention, pressure build-up test transformator rated voltage is low, and the manufacture reducing testing transformer is difficult Degree；

3) present invention carries partial discharge monitoring unit, can carry out shelf depreciation situation in process of the test Measure.

4) present invention carries reactive-load compensation capacitor, and required meritorious power supply capacity is little, it is possible to achieve on-the-spot examination The requirement tested.

5) method of the present invention is clear, breaches conventional dry air reactor and cannot carry out turn-to-turn at the scene Insulate effective bottleneck, makes dry-type air-core reactor scene carry out inducting-voltage proof and is possibly realized, simultaneously in test During partial discharge quantity level is monitored, filled up domestic on-site assessment dry-type air-core reactor turn-to-turn The blank of insulating properties, the safe operation of effective dry-type air-core reactor.

Accompanying drawing explanation

Fig. 1 is the theory diagram of dry-type air-core reactor turn-to-turn insulation performance detecting system of the present invention.

Fig. 2 is dry-type air-core reactor turn-to-turn insulation performance detecting system partial discharge monitoring unit of the present invention Circuit theory diagrams.

Fig. 3 is the flow chart of dry-type air-core reactor turn-to-turn insulation method for testing performance of the present invention.

Detailed description of the invention

Below in conjunction with the accompanying drawings inventive technique scheme is further illustrated:

Embodiment one:

As it is shown in figure 1, the present invention include high-tension switch cabinet 1, frequency conversion experiment power supply 2, exciting transformer 3, Reactive power compensation unit 4, partial discharge monitoring unit 5 and tested article unit 6, high-tension switch cabinet 1 connects Entering 380V three-phase alternating current, high-tension switch cabinet 1, frequency conversion experiment power supply 2 are with exciting transformer 3 successively Electrical connection, exciting transformer 3 is by the output voltage U of frequency conversion experiment power supply 2₁Boosting is U₂, excitation transformation Series current table in the high tension loop of device 3.Partial discharge monitoring unit 5 is by coupling capacitor C_K, detection resistance Anti-Z_MTester M composition is put in drawn game.Reactive power compensation unit 4 is by 3 identical Capacitor banks C1～C3 Composition, wherein, Capacitor banks C1-C3 is formed in parallel by three capacitors, and this three group capacitors group is in parallel Together in order to increase the capacity of reactive-load compensation.Tested article unit 6 includes dry-type air-core reactor and alternating current Pressure measuring unit, described dry-type air-core reactor and ac voltage measurement unit are in parallel.

Exciting transformer 3 excites resonant tank, is made in loop by frequency conversion experiment power supply 2 output frequency Reactive power compensation unit 4 and test specimen unit 6 produce parallel resonance, it is achieved the full remuneration of reactive power. Exciting transformer 3 is played the effect of protection by high-tension switch cabinet 1, prevents the excessive damage equipment of electric current.Locally Electric discharge monitoring means 5 is by coupling capacitor C_K, detection impedance Z_MTester M is put in drawn game, utilizes pulse electricity The principle of stream method, is monitored the local discharging level of whole compression system and examines.

The output voltage of frequency conversion experiment power supply 2 is raised to properly by the present invention at the trial by exciting transformer 3 Magnitude of voltage, to excite whole test loop, the dynamically output frequency of regulation frequency conversion experiment power supply 2 and idle The capacitor group switching group number of power compensating unit 4, makes reactive power compensation unit and tested reactor become Frequently in experiment power supply frequency range, (30Hz-300Hz) realizes parallel resonance, thus realizes the complete of reactive power Full compensation, now the output frequency of frequency conversion experiment power supply 2 is test frequency, and 6 making alives of test specimen are i.e. For resonance potential.According to parallel resonance principle, this pilot system utilizes high voltage reactor and and compensates capacitor Resonance produces high voltage and big electric current, and power supply only needs the meritorious part consumed, required power supply in offer system Capacity significantly reduces, and the volume and weight of experimental facilities the most significantly reduces.And pilot system introduces pulse The partial discharge monitoring unit of current method, it is achieved thereby that to whole test loop, particularly test specimen 6 The detection of local discharging level and examination.

Embodiment two

As it is shown on figure 3, present embodiments provide a kind of dry-type air-core reactor turn-to-turn insulation performance detection side Method, comprises the steps:

1) calculate according to field device parameters, select reactive power compensator switching quantity, pass through dry type Air reactor parameter calculates on-the-spot test voltage value U, according to the rated voltage level calculation of 1.3 times, I.e. U=U_L* 1.3, U_LRepresent dry-type air-core reactor rated operational voltage；

2) according to frequency conversion experiment power supply rated output voltage frequency range, it is considered in the case of full remuneration, Selection reactive power compensation cell capacitance amount:

$C=\frac{1}{L\×{\left(2\mathrm{\π}f\right)}^2};$

Wherein, C: compensate condenser capacity；L: tested air reactor inductance value；F: test frequency；

3) the electric current I of overcompensation Capacitor banks dirty to test voltage_CCalculate:

$I_C=\frac{U}{1/j\mathrm{\ω}C}=jU\mathrm{\ω}C;$

Wherein, Ic: compensate condenser current；U: test voltage value；W: angular frequency；

4) the electric current I of convection current overtesting transformator₂Calculate:

$I_2=I_L+I_C=j(U\mathrm{\ω}C-\frac{U}{2\mathrm{\π}fL});$

Wherein, I₂: testing transformer electric current；I_L: tested dry-type air-core reactor electric current；Ic: compensate electricity Condenser current；U: test voltage value；F: test frequency；

5) to electric current I_C、I₂Numerical value be analyzed, parallel capacitor and the technology of testing transformer Whether parameter meets requirement；If this technical parameter is unsatisfactory for requirement, then changes and compensate capacitor and test transformation Device；

6) preview is calculated complete, field equipment connecting, carry out the turn-to-turn insulation performance of dry-type air-core reactor Certification test.

Step 6) comprise the steps:

Step 61) select suitably to compensate Capacitor banks according to calculating data and test specimen parameter, and connect Whole test pressurizing loop；

Step 62) on coupling capacitor, connect detection impedance, Partial Discharge Detection signal cable and office Portion's discharge detector；

Step 63) according to square wave calibration procedure, utilize verification squaring device at dry-type air-core reactor turn-to-turn Carry out the square wave calibration of 500pC in insulating properties detecting system, and observe background noise and (be not more than as far as possible 200pC)；

Step 64) power turn-on switch, slowly carry out voltage rising, simultaneously monitoring current value and with calculating Result contrasts；

In order to improve safety, slowly carry out voltage ascending step and include: first boost to 0.5 times of U, see Examine partial discharge quantity persistently 1 minute, without exception, continue to boost to 0.8 times of U, observe partial discharge quantity And continue 1 minute, and without exception, directly boost to U, and continue 1 minute record partial discharge quantity；

Step 65) after off-test, directly by near for voltage 0V, and cut off the electricity supply.

The voltage of dry-type air-core reactor can be monitored by ac voltage measurement unit, it is ensured that to pressure examination The dry-type air-core reactor voltage tested is monitored.In method equipment technical parameters whether meet requirement refer to meter Equipment, within the nominal parameter of equipment, will not be caused damage by the electric current of calculation gained or voltage, it is ensured that examination That tests is smoothed out.

Embodiment three

As in figure 2 it is shown, carry out owing to the present invention employs pulse current method in partial discharge monitoring unit 5 The monitoring of partial discharge quantity, it is therefore desirable to before applied voltage test starts, carries out office high-volume to whole pilot system The calibration of (partial discharge quantity), utilizes standard capacitor and square-wave generator, carries out whole test loop Calibration, wherein square-wave generator exports one end ground connection, and the other end utilizes holding wire to export square-wave signal, and executes It is added in the head end of coupling capacitor, as a example by 500pC, now adjusts square wave output and make it be output as 500pC, Square-wave signal should be able to be read in Partial discharge detector, according to the operation instruction of Partial discharge detector simultaneously Carry out square wave to calibrate.

The method of the present invention is clear, breaches conventional dry air reactor and cannot carry out turn-to-turn insulation at the scene Effective bottleneck, makes dry-type air-core reactor scene carry out inducting-voltage proof and is possibly realized, simultaneously in process of the test In partial discharge quantity level is monitored, filled up domestic on-site assessment dry-type air-core reactor turn-to-turn insulation The blank of performance, the safe operation of effective dry-type air-core reactor.

Finally illustrate, above example only in order to technical scheme to be described and unrestricted, ability Other amendment or equivalents that technical scheme is made by territory those of ordinary skill, as long as not taking off From the spirit and scope of technical solution of the present invention, all should contain in the middle of scope of the presently claimed invention.

Claims (8)

1. a dry-type air-core reactor turn-to-turn insulation performance detecting system, it is characterised in that: include high pressure Switch cubicle, frequency conversion experiment power supply, testing transformer, reactive power compensation unit, partial discharge monitoring unit With test specimen unit, described high-tension switch cabinet access 380V three-phase alternating current, described high-tension switch cabinet, Frequency conversion experiment power supply, testing transformer, reactive power compensation unit, partial discharge monitoring unit, test specimen Unit is sequentially connected with；Described partial discharge monitoring unit includes coupling electric capacity, measuring impedance and shelf depreciation survey Examination instrument, described tested article unit includes dry-type air-core reactor and ac voltage measurement unit, and described dry type is empty Core device and ac voltage measurement unit are in parallel；Described testing transformer excites resonant tank, passes through frequency conversion Experiment power supply output frequency makes the reactive power compensation unit in loop produce in parallel humorous with test specimen unit Shake.

2. a kind of dry-type air-core reactor turn-to-turn insulation performance detecting system described in claim 1, it is special Levy and be: series current table in the high tension loop of described testing transformer.

3. a kind of dry-type air-core reactor turn-to-turn insulation performance detecting system described in claim 1, it is special Levy and be: described reactive power compensation unit uses oil immersed type intensive compensation Capacitor banks.

4. a kind of dry-type air-core reactor turn-to-turn insulation performance detecting system as claimed in claim 1, its It is characterised by: described reactive power compensation unit is composed in series by multiple Capacitor banks, described Capacitor banks Composed in parallel by branched capacitor.

5. a kind of dry-type air-core reactor turn-to-turn insulation performance detecting system as claimed in claim 1, its It is characterised by: described testing transformer is exciting transformer.

6. a dry-type air-core reactor turn-to-turn insulation method for testing performance, it is characterised in that: include as follows Step:

1) calculate according to field device parameters, select reactive power compensator switching quantity, pass through dry type Air reactor parameter calculates on-the-spot test voltage value U, according to the rated voltage level calculation of 1.3 times, I.e. U=U_L* 1.3, U_LRepresent dry-type air-core reactor rated operational voltage；

2) according to frequency conversion experiment power supply rated output voltage frequency range, it is considered in the case of full remuneration, Selection reactive power compensation cell capacitance amount:

$C=\frac{1}{L\×{\left(2\mathrm{\π}f\right)}^2};$

Wherein, C: compensate condenser capacity；L: tested air reactor inductance value；F: test frequency；

3) the electric current I of overcompensation Capacitor banks dirty to test voltage_CCalculate:

$I_C=\frac{U}{1/j\mathrm{\ω}C}=jU\mathrm{\ω}C;$

Wherein, Ic: compensate condenser current；U: test voltage value；W: angular frequency；

4) the electric current I of convection current overtesting transformator₂Calculate:

$I_2=I_L+I_C=j(U\mathrm{\ω}C-\frac{U}{2\mathrm{\π}fL});$

Wherein, I₂: testing transformer electric current；I_L: tested dry-type air-core reactor electric current；Ic: compensate electricity Condenser current；U: test voltage value；F: test frequency；

5) to electric current I_C、I₂Numerical value be analyzed, parallel capacitor and the technology of testing transformer Whether parameter meets requirement；

6) preview is calculated complete, field equipment connecting, carry out the turn-to-turn insulation performance of dry-type air-core reactor Certification test.

A kind of dry-type air-core reactor turn-to-turn insulation method for testing performance the most according to claim 6, It is characterized in that:

Described step 6) comprise the steps:

Select suitably to compensate Capacitor banks according to calculating data and test specimen parameter, and connect whole test Pressurizing loop；

Coupling capacitor connects detection impedance, Partial Discharge Detection signal cable and shelf depreciation inspection Survey instrument；

According to square wave calibration procedure, utilize verification squaring device in dry-type air-core reactor turn-to-turn insulation performance Carry out the square wave calibration of 500pC in detecting system, and observe background noise；

Power turn-on switchs, and slowly carries out voltage rising, simultaneously monitoring current value carrying out with result of calculation Contrast；

After off-test, directly by near for voltage 0V, and cut off the electricity supply.

A kind of dry-type air-core reactor turn-to-turn insulation method for testing performance the most according to claim 7, It is characterized in that: described slowly carry out voltage rising, including:

First boost to 0.5 times of U, observe partial discharge quantity persistently 1 minute, without exception, continue to boost To 0.8 times of U, observe partial discharge quantity persistently 1 minute, without exception, directly boost to U, and persistently 1 minute record partial discharge quantity.