CN107045097A - A kind of test of iron-core reactor turn-to-turn insulation batch (-type) induced over voltage withstand test device and test method - Google Patents
A kind of test of iron-core reactor turn-to-turn insulation batch (-type) induced over voltage withstand test device and test 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
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Abstract
A kind of test of iron-core reactor turn-to-turn insulation batch (-type) induced over voltage withstand test device and test method, are characterized in that：The device includes controller, inverter circuit, chopper circuit and detection circuit, shown controller connects display screen, controller is connected by drive module with inverter circuit and chopper circuit, and detection circuit includes voltage detecting circuit and current detection circuit, and both connect controller.The step of test method is：The voltage signal of test voltage is applied to the two ends of tested reactor by controller；Controller is sampled by detection circuit to the virtual voltage and electric current of test product, calculates the phase difference of sampled voltage and sample rate current；Test product is pressurizeed, the phase difference measured after pressurization is poor as normalized phase；Phase difference and normalized phase difference are compared to judge the good and bad situation of tested reactor insulation.The present invention can analysis voltage, the angle relationship of electric current, in real time the good and bad situation to test item make assessment.
Description
Technical field：
The present invention relates to iron-core reactor turn-to-turn insulation technical field of measurement and test, and in particular to a kind of iron-core reactor turn-to-turn is exhausted
Edge test batch (-type) induced over voltage withstand test device and test method.
Background technology：
With the development of power system, monocoil application is extensive all the more, and wherein unicoil is mainly reactor.Either
Iron-core reactor or dry-type air-core reactor, in all interruption of services, its coil turn-to-turn insulation damages accident is accounted for mostly
Number.In order to ensure the reliability of turn-to-turn insulation, except operation department takes certain safeguard procedures, overvoltage is limited in necessarily
Amplitude below it is outer, it is often more important that reactor manufacturing sector will improve the workmanship of turn-to-turn insulation, and take rationally effectively
Test method, testing standard and testing equipment, the defective coil of the tool for hindering reactor safe operation is rejected, it is ensured that new
Reactor has enough turn-to-turn insulation levels, reduces the generation of reactor burnout failure.Traditional iron-core reactor turn-to-turn insulation
Test method is mainly lightning impulse method, and the method impact starting voltage skewness influences the effective of turn to turn test
Property, once there is turn-to-turn insulation to break down at the trial, reactor total impedance is varied less, it is difficult to find defect in time.
The content of the invention：
To overcome above-mentioned technical problem, sensed the invention provides a kind of iron-core reactor turn-to-turn insulation test with batch (-type)
Withstand test device and test method, it is as master controller, with igbt (IGBT) based on DSP and CPLD
, being capable of free output frequency real-time, tunable, voltage magnitude stabilization between 50-400Hz as the frequency conversion system of switching device
50kV, test voltage are evenly distributed, starting phase angle controllable alternating current in real time, and can realize to test item voltage and electric current
The angle relationship of real-time sampling, analysis voltage and electric current, can make assessment to the good and bad situation of test item in real time.
The iron-core reactor turn-to-turn insulation test batch (-type) induced over voltage withstand test device of the present invention, to achieve the above object
The technical scheme used is：Including main control unit, driver element and sampling unit, the main control unit include CPLD and
DSP, CPLD and DSP are attached by dual port RAM, the DSP connections display screen；The driver element includes inverter circuit and complete
Control rectifying circuit, the CPLD connects many sub-modules of signal and all controlled rectifier circuit respectively, and many sub-modules of signal are through drive circuit
Inverter circuit is connected, the sampling unit includes current detection circuit and voltage detecting circuit, voltage detecting circuit and electric current inspection
The conditioned circuit of slowdown monitoring circuit and outside A/D change-over circuits connection CPLD.
As a further improvement on the present invention, the inverter circuit is connected with filter circuit, filter circuit connection boosting electricity
Road.The voltage pulse exported by filter circuit to inverter circuit is filtered, then voltage pulse is boosted by booster circuit
It is after-applied to subject reactor on.
As a further improvement on the present invention, the inverter circuit is the single-phase bridge as switching device using IGBT
PWM pulse-width modulation circuits.
As a further improvement on the present invention, the booster circuit is transformer T.
As a further improvement on the present invention, the voltage detecting circuit is resistive-capacitive voltage divider circuit, conveniently obtains relatively low electricity
Pressure.
As a further improvement on the present invention, the current detection circuit is current transformer.
Batch (-type) induced voltage test, the technical scheme of use are used in the iron-core reactor turn-to-turn insulation test of the present invention
It is to comprise the following steps：
First, the test voltage inputted by display screen into DSP needed for experiment reactor, DSP is by the number of this test voltage
According in write-in dual port RAM；
2nd, CPLD reads the test voltage data in dual port RAM, and gives test voltage according to the data, exports specific
The voltage signal of amplitude and frequency is applied to the two ends of subject reactor；
3rd, the virtual voltage and actual current that are tested reactor are adopted by voltage detecting circuit and current detection circuit
CPLD is conveyed to after sample, CPLD writes sampled data in the different address of dual port RAM；
4th, DSP reads voltage sample data and current sampling data from the opposite side of dual port RAM, and calculates sampled voltage
Phase relation between sample rate current, i.e. both phase differences, then this phase difference is write back in dual port RAM；
5th, the size of test voltage is pressurized to after 30%-50% from display screen and inputted into DSP, CPLD reads pressurization
Rear test voltage and the two ends for being again applied to subject reactor, equally by voltage detecting circuit and current detection circuit pair plus
The virtual voltage and actual current that reactor is tested after pressure are used and are conveyed to CPLD, and CPLD again writes the sampled data
In the different address of dual port RAM, then DSP reads voltage sample data and electricity after pressurization from the opposite side of dual port RAM again
Sampled data is flowed, and calculates the phase difference of sampled voltage and sample rate current after pressurization, then regard this phase difference as normalized phase
Difference is simultaneously write back in dual port RAM；
6th, the normalized phase difference of the phase difference of step 4 and step 5 is compared to judge to be tested reactor insulation
Good and bad situation.
Further, the calculating process of the phase difference is：
Controller DPLD carries out sliding-model control to the voltage signal and current signal that collect, forms one by 500
The standard sine function value group SIN [500] of discrete point composition, discrete point at intervals of 5us, then 500 points just for 8 frequencys multiplication just
String function, enters the operation of line number point to obtained voltage, electric current discrete point by starting point of first point, obtains both by negative value to just
It is worth number during zero crossing, N and n is designated as respectively, then both phase differences is
The beneficial effects of the invention are as follows：The present invention be using DSP and CPLD as master controller, using CPLD, DSP with it is double
Mouth RAM is communicated, and realizes quick data exchange, and test voltage needed for reactor is tested in input in display screen and experiment are frequently
Rate, is adjusted according to actual tests voltage to the voltage of Buck chopper circuits, PWM ripples is produced by modulation method, by driving mould
The break-make of IGBT in block driving inverter circuit, produces the voltage waveform of desired different frequency, realizes that test voltage in real time may be used
Control, reaches the voltage-withstand test requirement of reactor turn-to-turn insulation；Simultaneously by detecting voltage and current of the circuit to tested reactor
Sampled, and analyze the angle relationship for calculating voltage and current, angle relationship during with pressurization 30%-50% is compared
Compared with so that analyzing subject reactor whether there is defect.
Compared with prior art, the present invention has the advantage that：
1), device is pressure-resistant functional, stable output amplitude 50kV test voltages, and frequency 50-400Hz is adjustable, and experiment
Voltage is applied on test item and is evenly distributed；
2), the present invention completes 6000 positive negative peak applied voltage tests, every time by the way of batch (-type) pressurization in 1min
Electric energy release in guarantee test loop is complete before pressurization, will not produce influence to voltage waveform next time；
3) there is good control strategy, test voltage can be in real time controlled；
4) possess perfect detecting system, defect can be found in time according to test item voltage, current angle relation；
5) in subject reactor side large bulk capacitance in parallel, reactive-load compensation is carried out to reactor, reduces capacity of experiment.
Brief description of the drawings：
Fig. 1 is the entire block diagram of control system；
Fig. 2 is the electrical systematic drawing of experimental rig；
Fig. 3 is the control flow chart of experimental rig.
Fig. 4 is the circuit diagram of filter circuit；
Fig. 5 is the oscillogram of test voltage when to use frequency be 0.01s for 400Hz, test period；
Fig. 6 is the oscillogram of test voltage when to use frequency be 0.04s for 400Hz, test period.
Embodiment：
Reference picture 1, iron-core reactor turn-to-turn insulation test batch (-type) induced over voltage withstand test device of the invention, including master
Unit, driver element and sampling unit are controlled, the main control unit includes CPLD and DSP, CPLD and DSP is connected by dual port RAM
Connect, the DSP connections display screen；The driver element includes inverter circuit and all controlled rectifier circuit, and the CPLD is connected respectively
The many sub-modules of signal and all controlled rectifier circuit, many sub-modules of signal connect inverter circuit, the sampling unit bag through drive circuit
Include current detection circuit and voltage detecting circuit, voltage detecting circuit and the conditioned circuit of current detection circuit and outside A/D
Change-over circuit connects CPLD.
This experimental rig is the reference picture 1 using DSP and CPLD as main control unit, and the pwm signal of CPLD outputs is more through signal
Sub-module inputs to drive circuit, and the break-make of IGBT in inverter circuit is driven by drive circuit, produces desired different frequency
Voltage waveform, and the real-time control to voltage is realized, reach the voltage-withstand test requirement of reactor turn-to-turn insulation, reference picture 3, electricity
Corrugating is after-applied on subject reactor with boosting processing after filtering, then is believed by sampling unit collection voltages signal and electric current
Number, by modulate circuit this little signal are amplified with processing after change into data signal through outside A/D change-over circuits again and send to
CPLD, reference picture 1 is communicated using CPLD, DSP and dual port RAM, realizes quick data exchange.
Reference picture 2,1 is power circuit, 2 is three phase controlled rectifier circuit, 3 is PWM inverter circuits, 4 is filter circuit, 5
For voltage and current detection circuit, power circuit connection three phase controlled rectifier circuit, three phase controlled rectifier circuit connects inverter circuit,
Inverter circuit connects filter circuit, and filter circuit is through transformer T connection voltage and current detection circuits.
The power circuit is inputted for three-phase 380V AC power, and opening for primary side main circuit is controlled by QF (breaker)
After logical and closure, breaker closing, pass through pre-charge resistance Ra、Rb、RcCharged at a slow speed to Support Capacitor, if being not added with precharge
Resistance, it is very big in the charging current of powered on moment because bus capacitor is very big, power supply, rectifying device, capacitor can be caused very
Big impact, has a strong impact on device lifetime or even causes to damage, after precharge terminates, KM (A.C. contactor) is closed, so that complete
Into primary side power up.
Three phase controlled rectifier circuit uses all controlled rectifier circuit (T) using IGCT as switching device to realize that rectification is defeated
Go out, rectifier output voltage udPulsed six times within a cycle, and pulsating waveform is identical every time, the average value of its output continuous pressure
It is relevant with Trigger Angle α, as α≤60o, Ud=2.34U2Cos α, by controlling Trigger Angle that output voltage can be realized in 257.4V-
514.8V in the range of change.
PWM inverter circuits be using IGBT as switching device single-phase bridge PWM pulse modulation technologies, from radiating and it is defeated
Go out the many-side consideration such as electric current, selection uses 4 road IGBT (V1、V2、V3、V4) mesh used in parallel to reach rated current output
, using the sinusoidal voltage of needs as modulating wave when being designed per road, initial option frequency is the triangular wave of 20 times of frequency of modulated wave
As carrier wave, synchronous modulation mode, carrier wave ratio are taken(fsFor frequency of modulated wave, fcFor carrier frequency) it is equal to constant.
The composition of filter circuit is main to include the inductance coil L with mutual inductance M1, inductance coil L2, filter inductance L, filtering
Electric capacity C and filter resistance R, is filtered out the higher hamonic wave in the square wave after inverter circuit inversion by filter circuit, realization pair
The selection of 50Hz-400Hz voltages.Reference picture 4, mutual inductance M plays weakening effect to coil voltage, and by regulation, both numbers of turn can be real
Now to the control of 2 fundamental waves of A, B and higher hamonic wave induced voltage.For fundamental wave, if two coil turns are equal, between coil
Sensing magnetic flux, which can be realized, cancels out each other, and does not produce influence on fundamental voltage；To higher hamonic wave, loop 1 is designed overall present and held
Property, it can raise circuit end voltage, be set by Reasonable Parameters, both achievable A, D higher hamonic wave current potential are identical, now
N points are equivalent to zero potential, therefore higher hamonic wave is in short-circuit condition in loop 1；B points, will be in B due to the presence of mutual inductance simultaneously
Point induces higher harmonic voltage, can be real by controlling the number of turn (now fundamental flux can not be completely counterbalanced by) of two mutual inductors
Existing B point higher hamonic wave current potentials and D point higher hamonic wave current potentials are close to equal, therefore the higher hamonic wave spilling general formed in loop 2
Can be seldom, even without so as to reach good filter effect.
The circuit of sampling unit：In order to carry out voltage sample to subject reactor, using resistive-capacitive voltage divider mode to height
Voltage carries out partial pressure, conveniently obtains low voltage, and its divider resistance ratio should be identical with capacitance ratio in parallel, i.e., necessary
Meet condition：C1R1=C2R2；Sampling to electric current directly can come real by subject reactor with the current transformer of access
It is existing.
Batch (-type) induced voltage test is used in the iron-core reactor turn-to-turn insulation test of the present invention, is comprised the following steps：
First, the test voltage inputted by display screen into DSP needed for experiment reactor, DSP is by the number of this test voltage
According in write-in dual port RAM；
2nd, CPLD reads the test voltage data in dual port RAM, and gives test voltage according to the data, exports specific
The voltage signal of amplitude and frequency is applied to the two ends of subject reactor；
3rd, the virtual voltage and actual current that are tested reactor are adopted by voltage detecting circuit and current detection circuit
CPLD is conveyed to after sample, CPLD writes sampled data in the different address of dual port RAM；
4th, DSP reads voltage sample data and current sampling data from the opposite side of dual port RAM, and calculates sampled voltage
Phase relation between sample rate current, i.e. both phase differences, then this phase difference is write back in dual port RAM；
5th, the size of test voltage is pressurized to after 30%-50% from display screen and inputted into DSP, CPLD reads pressurization
Rear test voltage and the two ends for being again applied to subject reactor, equally by voltage detecting circuit and current detection circuit pair plus
The virtual voltage and actual current that reactor is tested after pressure are used and are conveyed to CPLD, and CPLD again writes the sampled data
In the different address of dual port RAM, then DSP reads voltage sample data and electricity after pressurization from the opposite side of dual port RAM again
Sampled data is flowed, and calculates the phase difference of sampled voltage and sample rate current after pressurization, then regard this phase difference as normalized phase
Difference is simultaneously write back in dual port RAM；
6th, the normalized phase difference of the phase difference of step 4 and step 5 is compared to judge to be tested reactor insulation
Good and bad situation.
Wherein, the calculating process of the phase difference is：
Controller DPLD carries out sliding-model control to the voltage signal and current signal that collect, forms one by 500
The standard sine function value group SIN [500] of discrete point composition, discrete point at intervals of 5us, then 500 points just for 8 frequencys multiplication just
String function, enters the operation of line number point to obtained voltage, electric current discrete point by starting point of first point, obtains both by negative value to just
It is worth number during zero crossing, N and n is designated as respectively, then both phase differences is
According to standard GB/T 1094.3-2003, when carrying out the test induced over voltage withstand test of iron core reactor turn-to-turn insulation,
Test voltage should be at twice or so of rated voltage, when test voltage frequency is equal to or less than 2 times of rated frequencies, its full voltage
Under test period should be 60s, when test frequency is more than twice of rated frequency, test period should be：
But no less than 15s.
According to the requirement standard of above formula, under the premise of guarantee meets abundant test period, the highest experiment electricity that can be realized
Voltage-frequency rate is 400Hz, needs intermittent 6000 positive negative peaks pressurization examinations of completion.
Two given below specific test voltage numerical value are analyzed come the batch (-type) pressuring method to the present invention：
A kind of is each test period 0.01s, that is, when pressurizeing when using the frequency to be tested for 400Hz test voltage
Between be 0.0025s, be 0.0075s by discharge times of RLC filter circuits 4,6000 positive negative peaks are carried out altogether pressurize to examine
Core, test voltage oscillogram is as shown in Figure 5；
Another is that when using the frequency to be tested for 400Hz test voltage, each test period is 0.04s, i.e., always
Pressing time is 0.01s, is during which carried out continuously 4 positive negative peak pressurization examinations, is 0.03s by RLC discharge times, altogether complete
Into 6000 positive negative peak pressurization examinations, test voltage oscillogram is as shown in Figure 6.
Claims (8)
1. a kind of iron-core reactor turn-to-turn insulation test batch (-type) induced over voltage withstand test device, it is characterised in that：Including master control
Unit, driver element and sampling unit, the main control unit includes CPLD and DSP, CPLD and DSP is attached by dual port RAM,
The DSP connections display screen；The driver element includes inverter circuit and all controlled rectifier circuit, and the CPLD connects signal respectively
Many sub-modules and all controlled rectifier circuit, many sub-modules of signal connect inverter circuit through drive circuit, and the sampling unit includes electricity
The conditioned circuit of current detection circuit and voltage detecting circuit, voltage detecting circuit and current detection circuit and outside A/D are changed
Circuit connects CPLD.
2. a kind of iron-core reactor turn-to-turn insulation test batch (-type) induced over voltage withstand test device as claimed in claim 1, its
It is characterised by：The inverter circuit is connected with filter circuit, filter circuit connection booster circuit.
3. a kind of iron-core reactor turn-to-turn insulation test batch (-type) induced over voltage withstand test device as claimed in claim 1, its
It is characterised by：The inverter circuit is the single-phase bridge PWM pulse-width modulation circuits as switching device using IGBT.
4. a kind of iron-core reactor turn-to-turn insulation test batch (-type) induced over voltage withstand test device as claimed in claim 2, its
It is characterised by：The booster circuit is transformer T.
5. a kind of iron-core reactor turn-to-turn insulation test batch (-type) induced over voltage withstand test device as claimed in claim 1, its
It is characterised by：The voltage detecting circuit is resistive-capacitive voltage divider circuit.
6. a kind of iron-core reactor turn-to-turn insulation test batch (-type) induced over voltage withstand test device as claimed in claim 1, its
It is characterised by：The current detection circuit is current transformer.
7. batch (-type) induced voltage test is used in a kind of iron-core reactor turn-to-turn insulation test, it is characterised in that including following step
Suddenly：
First, the test voltage inputted by display screen into DSP needed for experiment reactor, DSP writes the data of this test voltage
Enter in dual port RAM；
2nd, CPLD reads the test voltage data in dual port RAM, and gives test voltage according to the data, exports amplitude and specific
The two ends of tested reactor are applied to the voltage signal of frequency；
3rd, after voltage detecting circuit and current detection circuit are sampled to the virtual voltage and actual current that are tested reactor
CPLD is conveyed to, CPLD writes sampled data in the different address of dual port RAM；
4th, DSP reads voltage sample data and current sampling data from the opposite side of dual port RAM, and calculates sampled voltage and adopt
Phase relation between sample electric current, i.e. both phase differences, then this phase difference is write back in dual port RAM；
5th, the size of test voltage is pressurized to after 30%-50% from display screen and inputted into DSP, CPLD is read after pressurization
Test voltage and the two ends for being again applied to tested reactor, equally by voltage detecting circuit and current detection circuit to pressurization after
The virtual voltage and actual current of tested reactor are used and are conveyed to CPLD, and the sampled data is write twoport by CPLD again
In RAM different address, then DSP reads voltage sample data and electric current after pressurization from the opposite side of dual port RAM again and adopted
Sample data, and the phase difference of sampled voltage and sample rate current after pressurization is calculated, then it is poor simultaneously using this phase difference as normalized phase
Write back in dual port RAM；
6th, the normalized phase difference of the phase difference of step 4 and step 5 is compared to judge the quality of tested reactor insulation
Situation.
8. a kind of test side of iron-core reactor turn-to-turn insulation test batch (-type) induced over voltage withstand test as claimed in claim 7
Method, it is characterised in that：The calculating process of the phase difference is：
Controller DPLD carries out sliding-model control to the voltage signal and current signal that collect, and formation one is discrete by 500
The standard sine function value group SIN [500] of point composition, discrete point is just the sinusoidal letter of 8 frequencys multiplication at intervals of 5us, then 500 points
Number, enters the operation of line number point to obtained voltage, electric current discrete point by starting point of first point, obtains both by negative value on the occasion of mistake
Number during zero point is to calculate both phase differences.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107748320A (en) * | 2017-11-17 | 2018-03-02 | 广东电网有限责任公司电力科学研究院 | A kind of iron-core reactor turn-to-turn defect test circuit and method |
| CN108051715A (en) * | 2018-01-08 | 2018-05-18 | 云南电网有限责任公司曲靖供电局 | A kind of air reactor inter-turn insulation defect detecting system and method |
| CN108427087A (en) * | 2018-02-05 | 2018-08-21 | 国网江西省电力有限公司电力科学研究院 | A kind of Novel fault indicator detection platform |
| CN108535579A (en) * | 2018-07-02 | 2018-09-14 | 江苏高电电力设备有限公司 | Reactor integrated test system |
| CN109542067A (en) * | 2018-12-04 | 2019-03-29 | 天津大学 | Multivariable structural test real-time control system and method based on shared drive |
| CN112649703A (en) * | 2020-12-07 | 2021-04-13 | 哈尔滨理工大学 | Device for detecting insulating property of iron core reactor |
| CN113447782A (en) * | 2021-08-30 | 2021-09-28 | 南方电网科学研究院有限责任公司 | Coil equipment turn insulation state monitoring device, system and monitoring method |
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2017
- 2017-04-26 CN CN201710282737.0A patent/CN107045097A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107748320A (en) * | 2017-11-17 | 2018-03-02 | 广东电网有限责任公司电力科学研究院 | A kind of iron-core reactor turn-to-turn defect test circuit and method |
| CN108051715A (en) * | 2018-01-08 | 2018-05-18 | 云南电网有限责任公司曲靖供电局 | A kind of air reactor inter-turn insulation defect detecting system and method |
| CN108427087A (en) * | 2018-02-05 | 2018-08-21 | 国网江西省电力有限公司电力科学研究院 | A kind of Novel fault indicator detection platform |
| CN108535579A (en) * | 2018-07-02 | 2018-09-14 | 江苏高电电力设备有限公司 | Reactor integrated test system |
| CN109542067A (en) * | 2018-12-04 | 2019-03-29 | 天津大学 | Multivariable structural test real-time control system and method based on shared drive |
| CN112649703A (en) * | 2020-12-07 | 2021-04-13 | 哈尔滨理工大学 | Device for detecting insulating property of iron core reactor |
| CN113447782A (en) * | 2021-08-30 | 2021-09-28 | 南方电网科学研究院有限责任公司 | Coil equipment turn insulation state monitoring device, system and monitoring method |
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Application publication date: 20170815 |