CN109342910A - A kind of complete electric type local discharge detection device and detection method - Google Patents
A kind of complete electric type local discharge detection device and detection method Download PDFInfo
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- 238000009413 insulation Methods 0.000 description 9
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01R31/1227—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 of components, parts or materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01R31/1227—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 of components, parts or materials
- G01R31/1263—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 of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—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 of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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Abstract
The invention discloses a kind of complete electric type local discharge detection device and detection methods, comprising: high-voltage charging unit, capacitance matrix unit, pressure regulation unit, inversion unit, electronic power switch unit, inductance matrix unit, measuring unit and host system；The output end of high-voltage charging unit is connected with the input terminal of capacitance matrix unit, and high-voltage charging unit is used to provide electric energy for capacitance matrix unit；Capacitance matrix unit output end is connected with the input terminal of pressure regulation unit, and pressure regulation unit output end is connected with inversion unit input terminal；Electronic power switch unit is parallel between two output ends of inversion unit；One output end of inversion unit is grounded, another output series inductance matrix unit；Inductance matrix unit is for connecting product to be tested；Measuring unit is for being connected in parallel on product to be tested both ends；Host system is connected with the control electrode of switching device in each unit.The present invention is not necessarily to additional large power supply, and detection efficiency can be improved.
Description
Technical field
The invention belongs to Electric Power Equipment Insulation state inspection field, in particular to a kind of complete electric type Partial Discharge Detection
Device and detection method.
Background technique
With the development of the times, people's lives gradually improve, and national electricity consumption sharply increases therewith.In order to meet to electric power
The power transmission network of growing demand, China is quickly grown, and power equipment capacity and voltage class are continuously improved.Electric power is set
Standby insulation performance problem is also becoming increasingly acute, and the power equipment of large capacity high voltage proposes state of insulation detection technique higher
Requirement.
Condition assessment of insulation is mainly carried out to power equipment using pressure test in engineering, however some local non-through
Defect surely find by the way that pressure test is different, and the high voltage of pressure test can promote the local defect on power equipment into
The development of one step deteriorates, so that the case to break down after the power equipment band point operation a period of time being newly completed is much.
Main forms of the shelf depreciation as Electric Power Equipment Insulation failure early stage are both cause insulation ag(e)ing main
Reason, and be to characterize the main characteristic parameters of insulation status, therefore Partial Discharge Detection is a kind of detection power equipment non-through
The typical method of property defect.Compared to pressure test, Partial Discharge Detection test pressing time is short, will not be because of lasting high pressure
Defects of power equipment is caused to deteriorate.
For the big equivalent capacitance power equipment of 110kV and the above voltage, due to the limitation industrial frequency withstand voltage side of power supply capacity
Method can not be applied at the scene, and alternative common at present is mainly direct voltage method, frequency-changing AC voltage method and 0.1Hz
The methods of Ultra-low Frenquency Voltage.However DC voltage can cause space-charge accumulation in power equipment, and power equipment investment is caused to make
Working voltage after is higher than its voltage rating, the aging of acceleration equipment.And 0.1Hz Ultra-low Frenquency Voltage is used to substitute industrial frequency AC
The equivalence of voltage is simultaneously bad, and there are also to be studied for the validity of testing result.It is most common be connected using frequency modulation type it is humorous
Vibration method generates voltage of the frequency range in 30-300Hz and replaces power frequency ac voltage.International conference on large HV electric systems (CIGRE) 21-09 work
Make group to refer to out in annual report in 1997: the ac voltage withstanding test of 30-300Hz is good with the equivalence of industrial frequency withstand voltage, as high pressure
The pressure test of power equipment such as twisted polyethylene cable is more more efficient than other methods.
Big equivalent capacitance electric power equipment on-site test for 110kV and the above voltage, tests the output power to power supply
It is more demanding, currently generally diesel-driven generator is used to provide energy for testing equipment.However electric energy caused by diesel-driven generator
Quality is lower, and percent harmonic distortion is high, especially seriously affects measurement sensitivity when Partial Discharge Detection is tested.And diesel oil is sent out
Motor volume is big, quality weight, and transport is inconvenient, influences test efficiency.To sum up, it needs a kind of novel for large-capacity power equipment
Complete electric type local discharge detection device and method.
Summary of the invention
It is current defeated to solve the purpose of the present invention is to provide a kind of complete electric type local discharge detection device and detection method
Scene is difficult to provide large power supply and the lower problem of detection efficiency in the test of electric electric device maintenance.
In order to achieve the above objectives, the invention adopts the following technical scheme:
A kind of complete electric type local discharge detection device, comprising: high-voltage charging unit, capacitance matrix unit, pressure regulation unit, inverse
Become unit, electronic power switch unit, inductance matrix unit, measuring unit and host system；The output end of high-voltage charging unit
It is connected with the input terminal of capacitance matrix unit, high-voltage charging unit is used to provide electric energy for capacitance matrix unit；Capacitance matrix
Unit output end is connected with the input terminal of pressure regulation unit, and pressure regulation unit output end is connected with inversion unit input terminal；Inversion list
Electronic power switch unit is parallel between two output ends of member；One output end of inversion unit is grounded, another output
Hold series inductance matrix unit；Inductance matrix unit is for connecting product to be tested；Measuring unit is for being connected in parallel on product to be tested two
End；Host system is connected with the control electrode of switching device in each unit.
Further, high-voltage charging unit includes battery pack, charge protection resistance and booster circuit；One end of battery pack with
Charge protection resistance concatenation；Booster circuit realizes DC voltage booster circuit in the way of resonance, in conjunction with voltage-multiplying circuit, utilizes feedback
The output voltage amplitude of control DC voltage booster circuit is adjusted, the output end of booster circuit is the output end of high-voltage charging unit；Its
In, battery pack and the cooperation of charge protection resistance are so that battery pack output current peak is less than or equal to 10A.
Further, capacitance matrix unit includes: overvoltage crowbar and capacitor；Overvoltage crowbar and capacitor are simultaneously
Connection；Wherein, the capacitor volume is less than or equal to 0.5m3, quality be less than or equal to 25kg, moment output power reach 500kVA with
On.
Further, inversion unit includes: inverter circuit and transformer；Inverter circuit uses square wave PWM modulation mode pair
Single-phase bridge inverter circuit is controlled；Transformer is using silicon steel sheet metal as core material, frequency range 0-
400Hz, no-load voltage ratio 220V:1000V, Circuit Fault on Secondary Transformer are equipped with high-voltage arrester.
Further, electronic power switch unit includes: electronic power switching circuit, power supply circuit and driving circuit；Electricity
Power electronic switching circuit is connected in series by multiple insulated gate bipolar transistors and its buffering voltage equalizing protection circuit；Power supply circuit is adopted
With inverse-excitation type multiple-channel output isolated power supply topological structure；Inverse-excitation type multiple-channel output isolated power supply topological structure by lateral circuit and
Secondary side circuit two parts composition；Each insulated gate bipolar transistor is provided with individual secondary side circuit, a lateral circuit
Magnetic field transmission energy is utilized by the way of " loose coupling " with secondary side circuit；Driving circuit uses capacitor as its energy supply member
Part, power supply circuit is that the capacitor of driving circuit fills energy, when driving circuit driving insulated gate bipolar transistor is opened, closing power supply
Circuit, only capacitor provide energy for driving circuit.
Further, a lateral circuit and secondary side circuit utilize the tool of magnetic field transmission energy by the way of " loose coupling "
Body form is that a lateral circuit winding and secondary side winding are conducting wire of the punching around magnetic core, a lateral circuit
The secondary side circuit energy supply being furnished with to all insulated gate bipolar transistors.
Further, inductance matrix unit is connected in series using the inductance of multiple Nanocrystalline core coilings, and total inductance amount is high
In being equal to 3H, quality is less than or equal to 20KG, magnetic circuit closed.
Further, measuring unit includes: Partial Discharge Detection unit and high-tension measurement unit；Partial Discharge Detection unit
Coupled capacitor and high-tension measurement unit high-voltage arm share a capacitor.
Further, host system includes: upper computer and lower computer；
Slave computer main body is FPGA, for providing control signal for semiconductor switch device each in system；
Host computer is portable computer, is stored with human-computer interaction interface, shelf depreciation positioning software and resonance frequency and calculates
Method；
Resonance frequency algorithm is specifically, be 1ms by inversion unit one pulsewidth of output, voltage UCSquare wave, measure
Response voltage peak on capicitive sample is Uo；Capacitor calculation formula is,
In formula, L is the inductance value of inductance matrix unit, and R is the equivalent series impedance of inductance matrix unit, and k is inversion
The no-load voltage ratio of the included transformer of unit；
Calculate resonance frequency f expression formula be,
In formula, C is test product capacitance, and L is the inductance value of inductance matrix unit.
A kind of complete electric type detection method for local discharge, comprising the following steps:
Charging, charges to preset voltage value, cutoff high for the capacitor heap of capacitance matrix unit by high-voltage charging unit
Charhing unit provides electric energy by regulating circuit using the capacitor heap of the capacitance matrix unit after charging for rear polar circuit；
Resonance frequency is calculated, a lasting preset time is exported using inversion unit and amplitude is the preset voltage value
Square wave, it is U that measurement, which obtains the response wave shape peak value on product to be tested,o, calculate and obtain the humorous of product to be tested and inductance matrix unit
Vibration frequency f；
Pressurization makes product to be tested be in humorous with inductance matrix unit using the voltage wave of inversion unit export resonance frequency
Vibration state；The amplitude for changing output voltage wave by pressure regulation unit, makes voltage on product to be tested reach default amplitude；
Oscillation turns off inversion unit, opens electronic power switch unit, enters product to be tested and inductance matrix unit and owes
Damped oscillation state detects local discharge signal by measuring unit.
Compared with prior art, the invention has the following advantages:
The present invention is provided with high-voltage charging unit and capacitance matrix unit, the instantaneous output work of capacitor heap of capacitance matrix unit
Rate ability is strong, is energized using capacitor heap to equipment, without additional large power supply.The present invention utilizes humorous based on frequency modulation type series connection
The oscillation wave technology for principle of shaking, can be short by inversion unit, electronic power switch unit, inductance matrix unit and measuring unit
It completes that detection efficiency can be improved to the Partial Discharge Detection of transmission of electricity power equipment to be measured in time.The present invention can promote live examination
The efficiency and Partial Discharge Detection precision tested have important practical value in engineering.
Further, the present invention is charged using battery pack to capacitor heap, is energized using capacitor heap to equipment, is combined battery
Group energy storage is big, the strong advantage of capacitor heap instantaneous output power ability, can solve transmission of electricity electric power equipment on-site test large power supply
The problem of providing, is provided.Using capacitance matrix output without switching noise and exportable feature powerful in short-term, substitution is current normal
Diesel-driven generator, the noise from power end when can effectively reduce measurement of partial discharge.
Further, using special silicon steel sheet metal as core material, frequency range 0-400Hz becomes transformer
Than high frequency switching noise caused by inverter acts for 220V:1000V, can be filtered out, Circuit Fault on Secondary Transformer output voltage is reduced
Harmonic wave rate.Circuit Fault on Secondary Transformer is equipped with high-voltage arrester, avoids being moved in measurement by equipment under test failure or electronic power switch
Overvoltage, overcurrent caused by making damage detection device after transformer.
Further, electronic power switching circuit is by multiple insulated gate bipolar transistors (Insulated Gate
Bipolar Transistor, IGBT) and its buffering voltage equalizing protection circuit be connected in series, avoid due to IGBT turn off resistance exist
Unbalanced-voltage-division problem caused by dispersibility.When electronic power switching circuit both ends occur that the overvoltage of series IGBT may be damaged
When, protection circuit operation release overshoot energy guarantees that detection device is not damaged；It is opened using capacitive energy storage element driving IGBT
It is logical, reduce the interference signal of IGBT driving signal introducing.Using " loose coupling " inverse-excitation type multiple-channel output isolated power supply topology knot
Structure gives IGBT drive circuit function, realizes hi-lo circuit electrical isolation.
Further, lateral circuit winding and secondary side winding are the conducting wire that a punching bypasses magnetic core, and one one
The secondary side circuit function that secondary lateral circuit gives all IGBT to be furnished with.Such circuit structure ensures each IGBT power supply circuit electricity
Isolation on gas, it is possible to prevente effectively from since the overvoltage on individual devices leads to all device failures.
Further, inductance matrix unit is formed in series and parallel using several circle ring iron core inductance with air gap, magnetic circuit closed,
The total turn-to-turn capacitance of reactor can be reduced, increase Partial Discharge Detection sensitivity；Meanwhile it can avoid electromagenetic wave radiation in oscillatory process
It leaks and interferes control and measuring circuit.
Method of the invention utilizes the oscillation wave technology based on series resonant device with variable frequency principle, is completed in a short time to defeated
Electric power equipment Partial Discharge Detection, the detection efficiency of raising.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of complete electric type local discharge detection device of the invention；
Fig. 2 is IGBT power supply circuit and driving circuit principle schematic diagram in the embodiment of the present invention；
Fig. 3 is " loose coupling " connected mode schematic diagram in the embodiment of the present invention；
Fig. 4 is the HT waveform schematic diagram exported when the device of the invention work；
In Fig. 1, high-voltage charging unit 11；Capacitance matrix unit 12；Pressure regulation unit 13；Inversion unit 14；Power electronics is opened
Close unit 15；Inductance matrix unit 16；Product to be tested 17；Measuring unit 18；Host system 19.
Specific embodiment
Invention is further described in detail in the following with reference to the drawings and specific embodiments.
Referring to Fig. 1, a kind of complete electric type local discharge detection device of the invention, comprising: high-voltage charging unit 11, capacitor
Matrix unit 12, pressure regulation unit 13, inversion unit 14, electronic power switch unit 15, inductance matrix unit 16, measuring unit 18
With host system 19.The output end of high-voltage charging unit 11 connects with the input terminal of capacitance matrix unit 12, is capacitance matrix list
Member 12 provides energy.The output end of capacitance matrix unit 12 is connected with the input terminal of pressure regulation unit 13, the output of pressure regulation unit 13
End is connected with the input terminal of inversion unit 14.It is parallel with electronic power switch unit 15 between 14 two output ends of inversion unit,
One output end is grounded, and product to be tested 17 is connected after another output series inductance matrix unit 16.Measuring unit 18 is in parallel
At 17 both ends of product to be tested.Host system 19 is connected with the control electrode of switching device in each unit.
High-voltage charging unit 11 is made of battery pack, charge protection resistance and booster circuit；Battery pack and charge protection electricity
Resistance matches, it is ensured that battery pack exports current peak and is less than 10A, and battery pack is avoided to damage because output power is larger；Boosting electricity
Small-sized DC booster circuit is realized in conjunction with voltage-multiplying circuit, utilizes feedback regulation control DC boosting in the way of resonance in road
The output voltage amplitude of circuit.For example, booster circuit is traditional voltage-multiplying circuit.
Capacitance matrix unit 12 is connected in parallel on high-voltage charging unit 11 and 13 low-pressure end of pressure regulation unit, capacitance matrix unit 12 by
Overvoltage crowbar and large value capacitor are formed in parallel, and capacitor capacitance is depending on the equivalent capacitance of product to be tested 17, generally
By 50 or more 4700 μ F, pressure resistance is that the big capacity electrolyte capacitor of 450V is formed in parallel, and volume is no more than 0.5m3, quality
No more than 25kg, moment output power can easily obtain bigger function up to 500kVA or more according to actual needs
Rate.
Pressure regulation unit 13 combines feedback control technology, harmonic technology with full-bridge rectification technology, realizes that high efficiency is high
Accuracy direct current voltage reulation.
Inversion unit 14 is made of inverter circuit and transformer.Inverter circuit is using square wave PWM modulation mode to single-phase bridge
Formula inverter circuit is controlled, it is possible to reduce the action frequency of inverter in each modulation period reduces the harmonic wave of output voltage
Rate.Transformer using special silicon steel sheet metal as core material, frequency range 0-400Hz, no-load voltage ratio 220V:1000V,
High frequency switching noise caused by inverter acts can be filtered out, the harmonic wave rate of Circuit Fault on Secondary Transformer output voltage is reduced.Transformer
Secondary side is equipped with high-voltage arrester, avoids excessively electric caused by being acted in measurement by equipment under test failure or electronic power switch
Pressure, overcurrent damage detection device after transformer.
Electronic power switch unit 15 is made of electronic power switching circuit, power supply circuit and driving circuit.Power electronics
Switching circuit by multiple insulated gate bipolar transistors (Insulated Gate Bipolar Transistor, IGBT) and its
Buffering voltage equalizing protection circuit is connected in series, and avoids there are problems that unbalanced-voltage-division caused by dispersibility since IGBT turns off resistance.
When electronic power switching circuit both ends, which occur, may damage the overvoltage of series IGBT, protection circuit operation release overshoot energy
Amount guarantees that detection device is not damaged.Power supply circuit uses inverse-excitation type multiple-channel output isolated power supply topological structure, inverse-excitation type multichannel
Output isolated power supply topological structure is made of a lateral circuit and secondary side circuit two parts.
Fig. 2 and Fig. 3 are please referred to, it is its drive circuitry, primary side that each IGBT, which is provided with individual secondary side circuit,
Circuit and secondary side circuit utilize magnetic field transmission energy using " loose coupling " by the way of, be embodied in a lateral circuit winding and
Secondary side winding is the conducting wire that a punching bypasses magnetic core, the secondary side circuit that a lateral circuit gives all IGBT to be furnished with
Function.Such circuit structure ensures the isolation of each IGBT power supply circuit electrically, it is possible to prevente effectively from due to single device
Overvoltage on part leads to all device failures.Driving circuit uses capacitor as its function element, and power supply circuit is its capacitor
Energy is filled, when circuit drives IGBT is opened, closes power supply circuit, only capacitor provides energy for driving circuit.Capacitor is provided
Electric energy it is pure, percent harmonic distortion is low, greatly reduce IGBT driving signal introducing interference signal.
Inductance matrix unit 16 is connected in series using the inductance of multiple Nanocrystalline core coilings, and total inductance amount is not less than 3H,
Quality is no more than 20KG, magnetic circuit closed, and the electric current of mechanical periodicity passes through inductance to surrounding space spoke in the avoiding device course of work
The high-intensity magnetic field of mechanical periodicity is projected, jamming equipment control system and measuring system work normally；In addition, magnetic circuit closed can reduce
Electromagnetic interference caused by resonance.
Measuring unit 18 is made of Partial Discharge Detection unit and high-tension measurement unit, wherein Partial Discharge Detection unit
The high-voltage arm of coupled capacitor and high-tension measurement unit shares a capacitor, uses pressure-resistant 60kV, capacitance for the high voltage non-local discharge of 2 μ F
Capacitor.
Host system 19 includes upper computer and lower computer two parts, and slave computer main body is FPGA, is partly led to each in system
Body switching device provides control signal；Host computer is portable computer, mainly includes human-computer interaction interface, shelf depreciation positioning
Software, resonance frequency algorithm etc..
The inverter circuit that resonance frequency algorithm is included by inversion unit export a pulsewidth be 1ms, voltage UC's
Square wave, can measure the response voltage peak on capicitive sample is Uo.Capacitor calculation formula is as shown in Equation 1, and L is inductance square in formula
The inductance value of array element, R are the equivalent series impedance of inductance matrix unit, no-load voltage ratio of the k by inverter circuit comprising transformer.
Using the inductance value of test product capacitance C and inductance matrix unit, resonance frequency f can be calculated according to formula 2.
The present invention improves on the basis of series resonant device with variable frequency test principle, make it is suitable for power equipment part
Discharge examination test；The feature strong using capacitance matrix module short-time rating fan-out capability, output voltage waveforms harmonic wave rate is low, solution
Determined 110kV and the above voltage the test of big equivalent capacitance electric power equipment on-site when be difficult to provide asking for high-power low noise power supply
Topic；" loose coupling " inverse-excitation type multiple-channel output isolated power supply topological structure is utilized, realization high-voltage switch gear is isolated with control circuit；Benefit
The magnetic circuit closed of reactor is realized with modularized inductance matrix unit, is greatly reduced while improving Partial Discharge Detection precision
The weight of equipment.For the invention patent by above scheme, the big equivalent capacitance power equipment for improving 110kV and the above voltage is existing
The efficiency and Partial Discharge Detection precision of field test, have important practical value in engineering.Present invention can apply to cable,
The device of the large capacities capacitive high-tension electricity apparatus local discharge such as generator detection.Detection device of the invention is by internal battery group
Power supply can save the external large power supply such as generator when measuring at the scene, improve the noise resisting ability of equipment, realize high-low pressure
Partial electrical isolation.The present invention can promote the technical level of related fields, have broad application prospects.
A kind of application method of complete electric type local discharge detection device for large capacity capacitive apparatus of the invention
That is detection method mainly includes following 4 steps:
Charging: capacitor heap is charged to 700V by starting battery pack, is cut off battery pack, is by regulating circuit using capacitor heap
Polar circuit provides electric energy afterwards.
It calculates resonance frequency: being the square wave that 1ms amplitude is 700V using inverter circuit one duration of output, pass through survey
It is U that amount, which can obtain the response wave shape peak value on capicitive sample,o, capicitive sample and inductance matrix list are calculated using above-mentioned formula 1 and formula 2
The resonance frequency f of member 16.
Pressurization: using the voltage wave of inverter circuit export resonance frequency, product to be tested is made to be in humorous with inductance matrix unit
Vibration state.The amplitude for changing output voltage wave by pressure regulation unit, makes voltage on product to be tested reach default amplitude.This stage quilt
Test article both end voltage waveform is as shown in resonance pressurized state in Fig. 4.
Oscillation: shutdown inverter circuit opens electronic power switch unit, enters product to be tested and inductance matrix unit and owes
Damped oscillation state detects local discharge signal by measuring unit.It is hindered in this stage product to be tested both end voltage waveform such as Fig. 4
Shown in Buddhist nun's oscillatory regime.
Embodiment
A kind of complete electric type local discharge detection device of the invention, comprising: high-voltage charging unit, is adjusted capacitance matrix unit
Press unit, inversion unit, electronic power switch unit, inductance matrix unit, measuring unit and host system.High-voltage charging unit
Output end connect with the input terminal of capacitance matrix unit, provide energy for capacitance matrix unit.Capacitance matrix unit output end
It is connected with the input terminal of pressure regulation unit, pressure regulation unit output end is connected with inversion unit input terminal.Two output ends of inversion unit
Between be parallel with electronic power switch unit, an output end ground connection connects after another output series inductance matrix unit
Product to be tested.Measuring unit is connected in parallel on product to be tested both ends.Host system is connected with the control electrode of switching device in each unit.Its
In, the connection type of electronic power switch unit, electronic power switch unit is reversely gone here and there in a manner of common emitter by two IGBT
Join, and on-off control is carried out using " loose coupling " isolation power supply mode.The collector of two concatenated IGBT point
It is not connected with the both ends of high voltage side of transformer in inversion unit.Inductance matrix unit is connected in series using multiple inductance, capacitor square
Array element is formed in parallel using multiple capacitors.
To sum up, the present invention is a kind of complete electric type local discharge detection device for large capacity capacitive apparatus.This hair
Bright device is by high-voltage charging unit, capacitance matrix unit, pressure regulation unit, inversion unit, electronic power switch unit, inductance square
Array element, measuring unit and host system are constituted, and can apply the frequency range that peak value is up to 250kV on tested power equipment
For the oscillating wave voltage of 30-500Hz.Experiment shows that power equipment is acted in frequency for the oscillating wave voltage within the scope of 30-500Hz
Lower its insulation characterisitic with power-frequency voltage effect time is more similar, therefore oscillating wave voltage analog industrial frequency AC high voltage is to including
A variety of large capacity capacitive apparatus including cable, large-scale generator etc. carry out offline inspection test, effective in guarantee test
Property while reduce requirement of the test to power supply capacity.The present invention using capacitance matrix export without switching noise and it is exportable in short-term
Powerful feature substitutes current common diesel-driven generator, the noise from power end when measurement of partial discharge is effectively reduced.
After power equipment is boosted to preset value using series resonant device with variable frequency technology, closure electronic power switch unit generates oscillation
Wave.Power supply, power supply unit and main circuit is isolated without electrical connection using inverse-excitation type in electronic power switch unit, reduces power supply
Device security is improved while holding influence of noise.Inductance matrix is connected in series using multiple magnetic circuit closed reactors, is sealed
The magnetic circuit closed limits the radiation scope of electromagnetic field in oscillatory process, substantially reduces oscillating current to measuring unit and electric power electricity
The interference of sub switch control.Complete electric type local discharge detection device of the invention, can be to the state of insulation of the power equipments such as cable
It is assessed, solves the dependence of current 110kV and above power equipment off-line detection device to large power supply
Problem significantly reduces noise jamming, improves measurement accuracy, while substantially reducing the volume and weight of test equipment,
Convenient for onsite moving and installation, there is important engineering practical value.
The above is only the preferred embodiment of the invention patent, not makees any form to the invention patent
On limitation, those skilled in the art make a little simple modification, equivalent variations or modification using the technology contents of the disclosure above,
It all falls in the scope of protection of the patent of the present invention.
Claims (10)
1. a kind of complete electric type local discharge detection device characterized by comprising high-voltage charging unit (11), capacitance matrix list
First (12), pressure regulation unit (13), inversion unit (14), electronic power switch unit (15), inductance matrix unit (16), measurement are single
First (18) and host system (19)；
The output end of high-voltage charging unit (11) is connected with the input terminal of capacitance matrix unit (12), high-voltage charging unit (11)
For providing energy for capacitance matrix unit (12)；The output end of capacitance matrix unit (12) and the input terminal of pressure regulation unit (13)
It is connected, the output end of pressure regulation unit (13) is connected with the input terminal of inversion unit (14)；Two outputs of inversion unit (14)
Electronic power switch unit (15) are parallel between end；One output end of inversion unit (14) is grounded, another output string
Join inductance matrix unit (16)；Inductance matrix unit (16) is for connecting product to be tested (17)；Measuring unit (18) is for parallel connection
At product to be tested (17) both ends；Host system (19) is connected with the control electrode of switching device in each unit.
2. a kind of complete electric type local discharge detection device according to claim 1, which is characterized in that high-voltage charging unit
It (11) include battery pack, charge protection resistance and booster circuit；
One end of battery pack is concatenated with charge protection resistance；
Booster circuit realizes DC voltage booster circuit in the way of resonance, in conjunction with voltage-multiplying circuit, utilizes feedback regulation control direct current
The output voltage amplitude of booster circuit；
Wherein, battery pack and charge protection resistance cooperate so that battery pack output current peak is less than or equal to 10A.
3. a kind of complete electric type local discharge detection device according to claim 1, which is characterized in that capacitance matrix unit
It (12) include: overvoltage crowbar and capacitor；Overvoltage crowbar and capacitor are in parallel；
Wherein, the capacitor volume is less than or equal to 0.5m3, quality be less than or equal to 25kg, moment output power reach 500kVA with
On.
4. a kind of complete electric type local discharge detection device according to claim 1, which is characterized in that inversion unit (14) packet
It includes: inverter circuit and transformer；
Inverter circuit controls single-phase bridge inverter circuit using square wave PWM modulation mode；Transformer uses silicon steel metal
Piece is equipped with high voltage lightning-protection as core material, frequency range 0-400Hz, no-load voltage ratio 220V:1000V, Circuit Fault on Secondary Transformer
Device.
5. a kind of complete electric type local discharge detection device according to claim 1, which is characterized in that electronic power switch list
First (15) include: electronic power switching circuit, power supply circuit and driving circuit；
Electronic power switching circuit is connected in series by multiple insulated gate bipolar transistors and its buffering voltage equalizing protection circuit；
Power supply circuit uses inverse-excitation type multiple-channel output isolated power supply topological structure；Inverse-excitation type multiple-channel output isolated power supply topological structure
It is made of a lateral circuit and secondary side circuit two parts；Each insulated gate bipolar transistor is provided with individual secondary side electricity
Road, a lateral circuit and secondary side circuit utilize magnetic field transmission energy by the way of " loose coupling "；Driving circuit uses capacitor
Element is energized as it, power supply circuit is that the capacitor of driving circuit fills energy, and driving circuit driving insulated gate bipolar transistor is opened
When logical, power supply circuit is closed, only capacitor provides energy for driving circuit.
6. a kind of complete electric type local discharge detection device according to claim 5, which is characterized in that a lateral circuit and two
Secondary lateral circuit uses the mode of " loose coupling " using the concrete form of magnetic field transmission energy for a lateral circuit winding and secondary side
Winding is the conducting wire that a punching bypasses magnetic core, and a lateral circuit gives two that all insulated gate bipolar transistors are furnished with
Secondary lateral circuit energy supply.
7. a kind of complete electric type local discharge detection device according to claim 1, which is characterized in that inductance matrix unit
(16) it being connected in series using the inductance of multiple Nanocrystalline core coilings, total inductance amount is optionally greater than 3H, and quality is less than or equal to 20KG,
It is magnetic circuit closed.
8. a kind of complete electric type local discharge detection device according to claim 1, which is characterized in that measuring unit (18) packet
It includes: Partial Discharge Detection unit and high-tension measurement unit；The coupled capacitor of Partial Discharge Detection unit and high-tension measurement unit
High-voltage arm shares a capacitor.
9. a kind of complete electric type local discharge detection device according to claim 1, which is characterized in that host system (19) packet
It includes: upper computer and lower computer；
Slave computer main body is FPGA, for providing control signal for semiconductor switch device each in system；
Host computer is portable computer, is stored with human-computer interaction interface, shelf depreciation positioning software and resonance frequency algorithm；
Resonance frequency algorithm is specifically, be 1ms by inversion unit one pulsewidth of output, voltage UCSquare wave, measure capacitive examination
Response voltage peak on product is Uo；Capacitor calculation formula is,
In formula, L is the inductance value of inductance matrix unit, and R is the equivalent series impedance of inductance matrix unit, and k is inversion unit
The no-load voltage ratio of included transformer；
Calculate resonance frequency f expression formula be,
In formula, C is test product capacitance, and L is the inductance value of inductance matrix unit.
10. a kind of complete electric type detection method for local discharge, which is characterized in that based on inspection described in any one of claims 1 to 9
Survey device, comprising the following steps:
Charging, charges to preset voltage value for the capacitor heap of capacitance matrix unit (12) by high-voltage charging unit (11), cuts off
High-voltage charging unit (11) is mentioned using the capacitor heap of the capacitance matrix unit (12) after charging by regulating circuit for rear polar circuit
For electric energy；
Resonance frequency is calculated, a lasting preset time is exported using inversion unit (14) and amplitude is the preset voltage value
Square wave, it is U that measurement, which obtains the response wave shape peak value on product to be tested (17),o, calculate and obtain product to be tested (17) and inductance matrix
The resonance frequency f of unit (16)；
Pressurization, using the voltage wave of inversion unit (14) export resonance frequency, makes product to be tested (17) and inductance matrix unit
(16) it is in resonant state；The amplitude for changing output voltage wave by pressure regulation unit (13), reaches voltage on product to be tested (17)
To default amplitude；
Oscillation turns off inversion unit (14), opens electronic power switch unit (15), make product to be tested (17) and inductance matrix list
First (16) enter underdamped oscillation state, detect local discharge signal by measuring unit (18).
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