CN105974290B - A kind of dry-type air-core reactor turn-to-turn insulation performance detecting system and method - Google Patents
A kind of dry-type air-core reactor turn-to-turn insulation performance detecting system and method Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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Abstract
The invention discloses a kind of dry-type air-core reactor turn-to-turn insulation performance detecting system and methods, including high-tension switch cabinet, frequency conversion experiment power supply, testing transformer, reactive power compensation unit, partial discharge monitoring unit and subject article unit, the high-tension switch cabinet accesses 380V three-phase alternating current, and the high-tension switch cabinet, frequency conversion experiment power supply, testing transformer, reactive power compensation unit, partial discharge monitoring unit, subject article unit are sequentially connected；The partial discharge monitoring unit includes coupled capacitor, measurement impedance and instrument for measuring partial discharge, and the tested article unit includes dry-type air-core reactor and ac voltage measurement unit, and the dry-type air-core reactor and ac voltage measurement unit are in parallel；The testing transformer excites resonant tank, makes reactive power compensation unit and subject article unit in circuit generate parallel resonance by frequency conversion experiment power supply output frequency.The present invention can carry out induced over voltage withstand test to 35 kilovolts of dry-type air-core reactor scenes, complete scene to the boost operations of reactor.
Description
Technical field
The present invention relates to dry-type air-core reactor technical fields, and in particular to a kind of dry-type air-core reactor turn-to-turn insulation
It can detection system and method.
Background technique
With the continuous development of China's power industry, for how to improve power supply quality and power supply reliability, have become
Power supply system major issue in need of consideration.Reactive power compensator plays an important role in terms of improving power supply quality, close several
Year is rapidly developed；And be to guarantee power supply reliability, guarantee transformer from short-circuit current rush, short circuit current limitation dress
It sets and is also used widely.
Dry-type air-core reactor is as the typical equipments in reactive power compensator and short-circuit current limiting device, due to it
With being lost, small, low noise, maintenance workload is small, be not susceptible to phase fault, the reactance value linearity is good, projected life is long
The advantages that, it is widely used in domestic and international grid equipment in recent years.The reactor that electric system is taken common are parallel reactance
Device and current-limiting reactor.Shunt reactor is used to the capacitive reactive power of absorption circuit, plays the work for improving Power System Reactive Power
With；Current-limiting reactor is then mainly used to limiting short-circuit current, or by limiting in power grid with capacitor serial or parallel connection
Higher hamonic wave.
With large-scale application of the dry-type air-core reactor in power grid, the accident caused due to the various defects of reactor
Also inevitably occur, to finding the short trouble caused due to turn-to-turn insulation in various defects in reactor defect statistics
Middle proportion highest, close to half.Most Reactor Faults are that turn-to-turn short circuit causes reactor catching fire, give electric system
Safe and stable operation bring very big influence.
For the detection experimental study of dry-type air-core reactor turn-to-turn insulation, the research method of domestic scholars can generally divide
Be following several: one is induced over voltage withstand test method, this method directly applies power-frequency voltage to reactor two ends, with reactor
Actual operating state is closest, can effectively examine the ability of reactor turn-to-turn insulation tolerance overvoltage, but nothing needed for this method
Function power is very big, capacity requirement when being difficult to have experimental rig to be able to satisfy test, so that the method be made to be extremely restricted.It is a kind of
It is lightning impulse voltage test method, due to the limitation of induced voltage test, this method is used as examination reactor by substitution
The tolerance of turn-to-turn insulation, but this method action time is shorter, energy is lower, and visual examination difficulty distinguishes, and turn-to-turn is short
Electrical parameter variable quantity caused by road is small, is also difficult to distinguish from lightning impulse waveform.
There are also be based on reactor one is the research of high-frequency impulse succusion, this method puncture short occur in turn-to-turn insulation
When reactor Parameters variation phenomenon, apply high frequency voltage on reactor, compare normal reactor and fault reactance device to application
Different attenuation constants is presented in voltage, to judge the turn-to-turn insulation state of reactor, this method is only exhausted to turn-to-turn is had already appeared
The reactor of edge defect is effective, and to the reactor of insulation breakdown does not occur there are turn-to-turn insulation hidden danger and then cannot achieve
Detection function.A kind of dry-type air-core reactor turn-to-turn insulation test device of Publication No. CN105445630, including input mould
Block, dry-type air-core reactor, observation circuit, MCU system, current foldback circuit, bus module, display module, signal conversion are opened
Pass, number/conversion circuit, input operation module；Observation circuit includes electric voltage observation circuit, reactive current observation circuit, active electricity
Observation circuit, power factor (PF) observation circuit are flowed, input module includes pressure regulator, high-voltage pulse circuit, high-frequency oscillating circuits, dry type
Air reactor input terminal connect high-frequency oscillating circuits, output end connect reactive current observation circuit, watt current observation circuit,
Power factor (PF) observation circuit.
Therefore, experimental study is carried out to the dry-type air-core reactor turn-to-turn insulation under different use conditions, realizes that dry type is empty
The on-site test of core device turn-to-turn insulation, just seem ever more important.
Summary of the invention
In view of this, in view of the deficiencies of the prior art, it is an object of the present invention to provide a kind of dry-type air-core reactor turn-to-turns
Insulating properties detection system and method can carry out induced over voltage withstand test to 35 kilovolts of dry-type air-core reactor scenes, complete existing
Boost operations of the field to reactor.
In order to solve the above technical problems, 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, frequency conversion test electricity
Source, testing transformer, reactive power compensation unit, partial discharge monitoring unit and subject article unit, the high-tension switch cabinet connect
Enter 380V three-phase alternating current, the high-tension switch cabinet, frequency conversion experiment power supply, testing transformer, reactive power compensation unit, office
Portion's electric discharge monitoring unit, subject article unit are sequentially connected；The partial discharge monitoring unit include coupled capacitor, measurement impedance and
Instrument for measuring partial discharge, the subject article unit include dry-type air-core reactor and ac voltage measurement unit, and the dry type is empty
Core device and ac voltage measurement unit are in parallel；The testing transformer excites resonant tank, defeated by frequency conversion experiment power supply
Frequency makes reactive power compensation unit and subject article unit in circuit generate parallel resonance out.
Preferably, series electrical flow table in the high tension loop of the testing transformer.
Preferably, the reactive power compensation unit uses oil immersed type intensive compensation capacitor group.
Preferably: the reactive power compensation unit is composed in series by multiple capacitor groups, and the capacitor group is by more
Branch capacitor composes in parallel.
Preferably, the testing transformer is exciting transformer.
A kind of dry-type air-core reactor turn-to-turn insulation method for testing performance, wherein include the following steps:
1) it is calculated according to field device parameters, selects reactive power compensator switched amount, pass through dry-type hollow reactance
Device parameter calculates field test voltage value U, according to 1.3 times of voltage rating level calculation, i.e. U=UL* 1.3, ULRepresent dry type
Air reactor rated operational voltage；
2) according to frequency conversion experiment power supply rated output voltage frequency range, consider in the case where being fully compensated, select idle
Power compensating unit capacitance:
Wherein, C: compensation capacitor capacitance；L: subject air reactor inductance value；F: test frequency；
3) it flows down the electric current I of overcompensation capacitor group to test voltageCIt is calculated:
Wherein, Ic: compensation capacitor electric current；U: test voltage value；W: angular frequency；
4) the electric current I of convection current overtesting transformer2It is calculated:
Wherein, I2: testing transformer electric current；IL: subject dry-type air-core reactor electric current；Ic: compensation capacitor electric current；U:
Test voltage value；F: test frequency；
5) to electric current IC、I2Numerical value analyzed, whether the technical parameter of parallel capacitor and testing transformer full
Foot requires；
6) it calculates preview to finish, field equipment connecting carries out the turn-to-turn insulation guaranteed performance test of dry-type air-core reactor.
Preferably, the step 6) includes the following steps:
According to calculating data and the suitable compensation capacitor group of test item parameter selection, and connects entire test and pressurize back
Road；
Connecting detection impedance, Partial Discharge Detection signal cable and Partial discharge detector in coupling capacitor；
According to square wave calibration procedure, using verification squaring device in dry-type air-core reactor turn-to-turn insulation performance detecting system
The upper square wave calibration for carrying out 500pC, and observe ambient noise；
Power turn-on switch, slowly progress voltage raising, while monitoring current value are simultaneously compared with calculated result；
After the test, it directly by the near 0V of voltage, and cuts off the power.
Preferably, the slow progress voltage raising, comprising:
0.5 times of U is boosted to first, observes partial discharge quantity and continues 1 minute, it is without exception, continue to boost to 0.8 times of U,
Observation partial discharge quantity simultaneously continues 1 minute, without exception, directly boosts to U, and continue 1 minute record partial discharge quantity.
The beneficial effects of the present invention are:
1) present invention can carry out induced over voltage withstand test to dry-type air-core reactor scene, complete scene to reactor turn-to-turn
The examination of insulation；
2) pressure build-up test transformer voltage rating needed for the present invention is low, reduces the manufacture difficulty of testing transformer；
3) the included partial discharge monitoring unit of the present invention, can measure shelf depreciation situation during test.
4) the included reactive-load compensation capacitor of the present invention, required active power supply capacity is small, and the requirement of field test may be implemented.
5) method of the invention is clear, and breaching conventional dry air reactor, can not to carry out at the scene turn-to-turn insulation effective
Bottleneck, make it possible that dry-type air-core reactor scene carries out inducting-voltage proof, while during the test to partial discharge quantity
Level is monitored, and has filled up the blank of domestic on-site assessment dry-type air-core reactor turn-to-turn insulation performance, effective dry-type hollow
The safe operation of reactor.
Detailed description of the invention
Fig. 1 is the functional block diagram of dry-type air-core reactor turn-to-turn insulation performance detecting system of the present invention.
Fig. 2 is that the circuit of dry-type air-core reactor turn-to-turn insulation performance detecting system partial discharge monitoring unit of the present invention is former
Reason figure.
Fig. 3 is the flow chart of dry-type air-core reactor turn-to-turn insulation method for testing performance of the present invention.
Specific embodiment
Inventive technique scheme is further illustrated with reference to the accompanying drawing:
Embodiment one:
As shown in Figure 1, the present invention includes high-tension switch cabinet 1, frequency conversion experiment power supply 2, exciting transformer 3, reactive power benefit
It repays unit 4, partial discharge monitoring unit 5 and subject article unit 6, high-tension switch cabinet 1 and accesses 380V three-phase alternating current, height presses off
Pass cabinet 1, frequency conversion experiment power supply 2 are sequentially connected electrically with exciting transformer 3, and exciting transformer 3 is electric by the output of frequency conversion experiment power supply 2
Press U1Boosting is U2, series electrical flow table in the high tension loop of exciting transformer 3.Partial discharge monitoring unit 5 is by coupling capacitor
CK, detection impedance ZMIt is formed with partial discharge tester M.Reactive power compensation unit 4 is made of 3 identical capacitor group C1~C3,
Wherein, capacitor group C1-C3 is formed in parallel by three capacitors, this three group capacitors group is connected in parallel idle to increase
The capacity of compensation.Being tested article unit 6 includes dry-type air-core reactor and ac voltage measurement unit, the dry-type air-core reactor
It is in parallel with ac voltage measurement unit.
Exciting transformer 3 excites resonant tank, makes the reactive power in circuit by 2 output frequency of frequency conversion experiment power supply
Compensating unit 4 and subject article unit 6 generate parallel resonance, realize the full remuneration of reactive power.High-tension switch cabinet 1 is to excitation-transformation variable
Depressor 3 plays the role of protection, prevents the excessive damage equipment of electric current.Partial discharge monitoring unit 5 passes through coupling capacitor CK, inspection
Survey impedance ZMThe local discharging level of entire compression system is supervised using the principle of pulse current method with partial discharge tester M
It surveys and examines.
The output voltage of frequency conversion experiment power supply 2 is raised to suitable voltage by exciting transformer 3 in test by the present invention
Value, to excite entire test loop, the output frequency of dynamic regulation frequency conversion experiment power supply 2 and the electricity of reactive power compensation unit 4
Container group switching group number makes reactive power compensation unit and tested the reactor (30Hz- in frequency conversion experiment power supply frequency range
300Hz) realize parallel resonance, to realize the full remuneration of reactive power, the output frequency of frequency conversion experiment power supply 2 is at this time
Test frequency, 6 making alives of test item are resonance potential.According to parallel resonance principle, which utilizes high pressure reactance
Device and high voltage and high current are generated with compensation capacitor resonance, power supply only needs the part of active consumption in offer system, required
Power supply capacity substantially reduce, the volume and weight of experimental facilities also substantially reduces.And pulse current is introduced in pilot system
The partial discharge monitoring unit of method, to realize to entire test loop, the especially detection of 6 local discharging level of test item
And examination.
Embodiment two
As shown in figure 3, present embodiments providing a kind of dry-type air-core reactor turn-to-turn insulation method for testing performance, including such as
Lower step:
1) it is calculated according to field device parameters, selects reactive power compensator switched amount, pass through dry-type hollow reactance
Device parameter calculates field test voltage value U, according to 1.3 times of voltage rating level calculation, i.e. U=UL* 1.3, ULRepresent dry type
Air reactor rated operational voltage；
2) according to frequency conversion experiment power supply rated output voltage frequency range, consider in the case where being fully compensated, select idle
Power compensating unit capacitance:
Wherein, C: compensation capacitor capacitance；L: subject air reactor inductance value；F: test frequency；
3) it flows down the electric current I of overcompensation capacitor group to test voltageCIt is calculated:
Wherein, Ic: compensation capacitor electric current；U: test voltage value；W: angular frequency；
4) the electric current I of convection current overtesting transformer2It is calculated:
Wherein, I2: testing transformer electric current；IL: subject dry-type air-core reactor electric current；Ic: compensation capacitor electric current；U:
Test voltage value；F: test frequency；
5) to electric current IC、I2Numerical value analyzed, whether the technical parameter of parallel capacitor and testing transformer full
Foot requires；If the technical parameter is unsatisfactory for requiring, compensation capacitor and testing transformer are replaced；
6) it calculates preview to finish, field equipment connecting carries out the turn-to-turn insulation guaranteed performance test of dry-type air-core reactor.
Step 6) includes the following steps:
Step 61) connects entire test according to calculating data and the suitable compensation capacitor group of test item parameter selection
Pressurizing loop；
Step 62) connecting detection impedance, Partial Discharge Detection signal cable and shelf depreciation inspection in coupling capacitor
Survey instrument；
Step 63) is according to square wave calibration procedure, using verification squaring device in dry-type air-core reactor turn-to-turn insulation performance
The square wave calibration of 500pC is carried out in detection system, and observes ambient noise (as far as possible no more than 200pC)；
Step 64) power turn-on switch, slowly carries out voltage raising, while monitoring current value and carrying out pair with calculated result
Than；
In order to improve safety, slowly carrying out voltage ascending step includes: to boost to 0.5 times of U first, observes shelf depreciation
It measures and continues 1 minute, it is without exception, continue to boost to 0.8 times of U, observes partial discharge quantity and continue 1 minute, it is without exception then direct
U is boosted to, and continues 1 minute record partial discharge quantity；
Step 65) after the test, directly by the near 0V of voltage, and is cut off the power.
Ac voltage measurement unit can be monitored the voltage of dry-type air-core reactor, and pressure test is done in guarantee
Formula air reactor voltage is monitored.In method equipment technical parameters whether meet the requirements refer to calculate resulting electric current or
Voltage will not damage equipment within the nominal parameter of equipment, and guarantee test is gone on smoothly.
Embodiment three
As shown in Fig. 2, since the present invention has used pulse current method to carry out shelf depreciation in partial discharge monitoring unit 5
The monitoring of amount, it is therefore desirable to before applied voltage test starts, the calibration of partial discharge amount (partial discharge quantity) is carried out to entire pilot system,
Using standard capacitor and square-wave generator, entire test loop is calibrated, wherein square-wave generator exports one end ground connection,
The other end exports square-wave signal using signal wire, and is applied to the head end of coupling capacitor, by taking 500pC as an example, adjustment side at this time
Wave output makes its output be 500pC, while square-wave signal should be able to be read in Partial discharge detector, according to Partial Discharge Detection
The operation instruction of instrument carries out square wave calibration.
Method of the invention is clear, and breaching conventional dry air reactor, can not to carry out at the scene turn-to-turn insulation effective
Bottleneck makes it possible that dry-type air-core reactor scene carries out inducting-voltage proof, while during the test to partial discharge quantity water
It is flat to be monitored, fill up the blank of domestic on-site assessment dry-type air-core reactor turn-to-turn insulation performance, effective dry-type hollow electricity
The safe operation of anti-device.
Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, this field is common
Other modifications or equivalent replacement that technical staff makes technical solution of the present invention, without departing from technical solution of the present invention
Spirit and scope, be intended to be within the scope of the claims of the invention.
Claims (6)
1. a kind of dry-type air-core reactor turn-to-turn insulation performance detecting system, it is characterised in that: tried including high-tension switch cabinet, frequency conversion
Electrical verification source, testing transformer, reactive power compensation unit, partial discharge monitoring unit and subject article unit, the high-voltage switch gear
Cabinet accesses 380V three-phase alternating current, the high-tension switch cabinet, frequency conversion experiment power supply, testing transformer, reactive power compensation list
Member, partial discharge monitoring unit, subject article unit are sequentially connected；The partial discharge monitoring unit includes coupled capacitor, measurement
Impedance and instrument for measuring partial discharge, the subject article unit include dry-type air-core reactor and ac voltage measurement unit, described
Dry-type air-core reactor and ac voltage measurement unit are in parallel；The testing transformer excites resonant tank, is tested by frequency conversion
Power supply output frequency makes reactive power compensation unit and subject article unit in circuit generate parallel resonance；
Dry-type air-core reactor turn-to-turn insulation method for testing performance, characterized by the following steps:
1) it is calculated according to field device parameters, selects reactive power compensator switched amount, joined by dry-type air-core reactor
Number calculates field test voltage value U, according to 1.3 times of voltage rating level calculation, i.e. U=UL* 1.3, ULRepresent dry-type hollow
Reactor rated operational voltage；
2) according to frequency conversion experiment power supply rated output voltage frequency range, consider in the case where being fully compensated, select reactive power
Compensating unit capacitance:
Wherein, C: compensation capacitor capacitance；L: subject air reactor inductance value；F: test frequency；
3) it flows down the electric current I of overcompensation capacitor group to test voltageCIt is calculated:
Wherein, Ic: compensation capacitor electric current；U: test voltage value；W: angular frequency；
4) the electric current I of convection current overtesting transformer2It is calculated:
Wherein, I2: testing transformer electric current；IL: subject dry-type air-core reactor electric current；Ic: compensation capacitor electric current；U: test
Voltage value；F: test frequency；
5) to electric current IC、I2Numerical value analyzed, whether the technical parameter of parallel capacitor and testing transformer, which meets, is wanted
It asks；
6) it calculates preview to finish, field equipment connecting carries out the turn-to-turn insulation guaranteed performance test of dry-type air-core reactor；
The step 6) includes the following steps:
According to calculating data and the suitable compensation capacitor group of test item parameter selection, and connect entire test pressurizing loop；
Connecting detection impedance, Partial Discharge Detection signal cable and Partial discharge detector in coupling capacitor；
It is enterprising in dry-type air-core reactor turn-to-turn insulation performance detecting system using verification squaring device according to square wave calibration procedure
The square wave of row 500pC is calibrated, and observes ambient noise；
Power turn-on switch, slowly progress voltage raising, while monitoring current value are simultaneously compared with calculated result；
After the test, it directly by the near 0V of voltage, and cuts off the power.
2. a kind of dry-type air-core reactor turn-to-turn insulation performance detecting system described in claim 1, it is characterised in that: the examination
Test series electrical flow table in the high tension loop of transformer.
3. a kind of dry-type air-core reactor turn-to-turn insulation performance detecting system described in claim 1, it is characterised in that: the nothing
Reactive power compensator unit uses oil immersed type intensive compensation capacitor group.
4. a kind of dry-type air-core reactor turn-to-turn insulation performance detecting system as described in claim 1, it is characterised in that: described
Reactive power compensation unit is composed in series by multiple capacitor groups, and the capacitor group is composed in parallel by more capacitors.
5. a kind of dry-type air-core reactor turn-to-turn insulation performance detecting system as described in claim 1, it is characterised in that: described
Testing transformer is exciting transformer.
6. a kind of dry-type air-core reactor turn-to-turn insulation performance detecting system according to claim 1, it is characterised in that: institute
It states and slowly carries out voltage raising, comprising:
0.5 times of U is boosted to first, observes partial discharge quantity and continues 1 minute, it is without exception, continue to boost to 0.8 times of U, observe
Partial discharge quantity simultaneously continues 1 minute, without exception, directly boosts to U, and continues 1 minute record partial discharge quantity.
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