CN105785247A - Circuit-breaker alternating current and direct current mixing voltage withstanding wiring loop used for alternating current filter and test method thereof - Google Patents
Circuit-breaker alternating current and direct current mixing voltage withstanding wiring loop used for alternating current filter and test method thereof Download PDFInfo
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- CN105785247A CN105785247A CN201610279398.6A CN201610279398A CN105785247A CN 105785247 A CN105785247 A CN 105785247A CN 201610279398 A CN201610279398 A CN 201610279398A CN 105785247 A CN105785247 A CN 105785247A
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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
- G01R31/14—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
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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Abstract
The invention discloses a circuit-breaker alternating current and direct current mixing voltage withstanding wiring loop used for an alternating current filter. The loop comprises a circuit breaker, a three-connection box, a pillar, a direct current voltage withstanding kit test apparatus and an alternating current voltage withstanding kit test apparatus. Two ends of the circuit breaker form a left fracture and a right fracture which are connected to the direct current voltage withstanding kit test apparatus and the alternating current voltage withstanding kit test apparatus respectively. The direct current voltage withstanding kit test apparatus comprises a first boost power supply cabinet, a direct current generator voltage multiplying cylinder and a first voltage division circuit. The alternating current voltage withstanding kit test apparatus comprises a second boost power supply cabinet, an industrial frequency transformer and a second voltage division circuit. The invention also discloses a circuit-breaker alternating current and direct current mixing voltage withstanding test method used for the alternating current filter. In the invention, at two ends of fractures of the circuit breaker, a power frequency alternating voltage and a high direct voltage are simultaneously performed; an on-site real operation condition is simulated as far as possible and a purpose of examining an insulating property of the circuit breaker under an alternating current and direct current mixing condition is reached.
Description
Technical field
The present invention relates to breaker technical field, the alternating current-direct current being specifically related to alternating current filter double-fracture porcelain knob breaker mixes pressure connection circuit and test method.
Background technology
Alternating current filter is as a kind of visual plant of current conversion station, it is possible to reduce the harmonic wave produced in alternating current-direct current conversion process, it is ensured that the quality of power supply is up to standard.And AC filter and breaker (ACF chopper) is due to its special application scenario, need to cutting off capacitive load, switching is frequent, and interrupting process is subjected to alternating current-direct current mixed-voltage, operating mode is relatively severe, and comparing normal circuit breaker should have higher technology requirement.
When chopper cuts alternating current filter capacitive load, the change procedure of fracture both end voltage.Due to after chopper and capacitive load in theory capacitive load voltage will not there is temporary change, and breaker fracture ac bus side is AC sine wave, the lower waveform that can form 1-coswt of alternating current-direct current mixing, is reaching about 10ms to peaking.This voltage waveform was a temporal variations process before 10ms, voltage rises a bigger steepness, afterwards, voltage waveform recovers the process of a stable state change, consider that in 1min alternating current filter side voltage is due to the bigger reason of capacitance, presenting the process of a slow decline, therefore, chopper can be equivalent under the operating mode operating in alternating current-direct current mixing in this process.
At present, the insulation examination of chopper is only considered the insulation performance of chopper under pure AC Condition by international standard, domestic standard and industry standard, do not consider that chopper is used in the insulating properties under alternating current filter group alternating current-direct current mixed flow regime, so also without corresponding test method and test connection loop.And the method that chopper two ends commonly used in the industry add anti-phase ac voltage withstanding can not replace alternating current-direct current mixing pressure test, reason is in that chopper side is alternating current filter Capacitor banks, voltage on Capacitor banks can not be undergone mutation after chopper cut-offs, so after chopper cut-offs in a period of time, residual voltage on Capacitor banks is equivalent to DC voltage (when voltage magnitude is cut-off the peak value of alternating voltage), therefore DC voltage has essential difference with the waveform of alternating voltage, the electrical conductivity ratio on two interrupting porcelain insulator surfaces of chopper determines the DC voltage distribution at two arc-chutes, the equalizing capacitor of arc-extinguishing chamber of circuit breaker parallel connection can only determine the balanced distribution of alternating voltage, so ac voltage withstanding and DC break down voltage can not substitute mutually.
Summary of the invention
For above-mentioned deficiency, an object of the present invention is in that based on the needs carrying out the pressure Insulation Test of mixing of chopper alternating current-direct current, a kind of alternating current filter chopper alternating current-direct current is provided to mix pressure Insulation Test connection circuit, the true operating condition of simulated field as far as possible, examines chopper insulating properties under alternating current-direct current mixed flow regime.
For achieving the above object, the present invention adopts the technical scheme that:
nullA kind of alternating current filter chopper alternating current-direct current mixes pressure connection circuit，It includes chopper、Three headers、Pillar、DC break down voltage battery of tests device and ac voltage withstanding battery of tests device，Described three headers are connected to the middle part of chopper，The two ends of chopper form left fracture and right fracture respectively，The downside connecting struts of described three headers，Described left fracture and right fracture connect DC break down voltage battery of tests device and ac voltage withstanding battery of tests device respectively，Wherein，Described DC break down voltage battery of tests device includes the first booster power cabinet、DC generator times pressure cylinder and the first bleeder circuit，The outfan of described first booster power cabinet is connected to left fracture through DC generator times pressure cylinder，One end of described first bleeder circuit is connected between DC generator times pressure cylinder and left fracture，Other end ground connection，Described first bleeder circuit includes the impedance R1 and impedance R2 of series connection，This first bleeder circuit also concatenates one first ammeter，At the two ends of impedance R2 and connect one first voltmeter；Described ac voltage withstanding battery of tests device includes the second booster power cabinet, Industrial Frequency Transformer and the second bleeder circuit, the outfan of described second booster power cabinet is connected to right fracture through Industrial Frequency Transformer, one end of described second bleeder circuit is connected between Industrial Frequency Transformer and right fracture, other end ground connection, described second bleeder circuit at least includes the capacitor of two concatenations, this second bleeder circuit also concatenates one second ammeter, at the two ends of capacitor at ground connection place and connect one second voltmeter.
A protective resistance R3 is also concatenated between described DC generator times pressure cylinder and left fracture; one end of described first bleeder circuit is connected between DC generator times pressure cylinder and protective resistance R3; also concatenating a protective resistance R4 between described Industrial Frequency Transformer and right fracture, one end of described second bleeder circuit is connected between Industrial Frequency Transformer and protective resistance R4.
Described protective resistance R3 and protective resistance R4 is the water resistance that resistance is not less than 1M Ω.
The SF of 0.2Mpa it is filled with in described DC generator times pressure cylinder6Gas.
An object of the present invention is in that based on the needs carrying out the pressure Insulation Test of mixing of chopper alternating current-direct current, a kind of alternating current filter chopper alternating current-direct current is provided to mix pressure Insulation Test method, the true operating condition of simulated field as far as possible, examines chopper insulating properties under alternating current-direct current mixed flow regime.
For achieving the above object, the present invention adopts the technical scheme that:
Mixing pressure connection circuit according to above-mentioned alternating current filter chopper alternating current-direct current and realize the test method that the mixing of chopper alternating current-direct current is pressure, it comprises the following steps:
Step 1, positive polarity are tested, and it comprises the following steps:
Step 11, by the first booster power cabinet, DC break down voltage battery of tests device is boosted, when the output voltage values of DC break down voltage battery of tests device reaches the √ 2 times of chopper phase voltage, keep the output voltage values of this DC break down voltage battery of tests device；
Step 12, tune sense reactor to Industrial Frequency Transformer carry out adjusting sense, ensure that ac voltage withstanding battery of tests device forms resonance under power-frequency voltage, then the second booster power cabinet is started from scratch boosting, start uniformly boosting from output voltage values is chopper phase voltage the 75% of ac voltage withstanding battery of tests device；
Step 13, when reaching 1 times of chopper phase voltage, 1.1 times, 1.15 times, 1.2 times and 1.3 times when the output voltage values of ac voltage withstanding battery of tests device, ac voltage withstanding battery of tests device is all made to keep this corresponding output voltage values 60s, if chopper occurs without disruptive discharge, then by corresponding positive polarity pressure test；When the boosting of ac voltage withstanding battery of tests device or keep in corresponding output voltage values process, significantly swing if there is one of them pointer of the first voltmeter, the second voltmeter, the first ammeter and the second ammeter, then positive polarity pressure test is not passed through；
Step 2, negative polarity are tested, and it comprises the following steps:
Step 21, by the first booster power cabinet, DC break down voltage battery of tests device is boosted, when the output voltage values of DC break down voltage battery of tests device reaches the-√ 2 times of chopper phase voltage, keep the output voltage values of this DC break down voltage battery of tests device；
Step 22, tune sense reactor to Industrial Frequency Transformer carry out adjusting sense, ensure that ac voltage withstanding battery of tests device forms resonance under power-frequency voltage, then the second booster power cabinet is started from scratch boosting, start uniformly boosting from output voltage values is chopper phase voltage the 75% of ac voltage withstanding battery of tests device；
Step 23, when reaching 1 times of chopper phase voltage, 1.1 times, 1.15 times, 1.2 times and 1.3 times when the output voltage values of ac voltage withstanding battery of tests device, ac voltage withstanding battery of tests device is all made to keep this corresponding output voltage values 60s, if chopper occurs without disruptive discharge, then by corresponding negative polarity pressure test；When the boosting of ac voltage withstanding battery of tests device or keep in corresponding output voltage values process, significantly swing if there is one of them pointer of the first voltmeter, the second voltmeter, the first ammeter and the second ammeter, then negative polarity pressure test is not passed through.
In positive polarity or negative polarity voltage-withstand test process of the test, if the left fracture of chopper or right fracture occur " " a sound, simultaneously significantly swinging occurs in one of them pointer value of the first voltmeter, the second voltmeter, the first ammeter and the second ammeter, and the now corresponding output voltage values of DC break down voltage battery of tests device and the output voltage values of ac voltage withstanding battery of tests device are chopper and puncture flashover voltage in alternating current-direct current operating mode.
The present invention is compared with prior art, it has the beneficial effects that: utilize industrial frequency inductance-regulation Withstand test device and high voltage direct current generator, power frequency ac voltage and high direct voltage breaker fracture two ends while, the true operating condition of simulated field as far as possible, reaches examination chopper purpose of insulating properties under alternating current-direct current mixed flow regime.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams that alternating current filter chopper alternating current-direct current of the present invention mixes pressure connection circuit.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, present disclosure is described in further details.
Embodiment
One, connection circuit
nullRefer to shown in Fig. 1: a kind of alternating current filter chopper alternating current-direct current mixes pressure connection circuit，It includes chopper 1、Three headers 4、Pillar 5、DC break down voltage battery of tests device 2 (being called for short DC loop or DC experiment) and ac voltage withstanding battery of tests device 3 (being called for short ac circuit or ac test)，Three headers 4 are connected to the middle part of chopper 1，The two ends of chopper 1 form left fracture and right fracture respectively，The downside connecting struts 5 of three headers 4，Left fracture and right fracture connect DC break down voltage battery of tests device 2 and ac voltage withstanding battery of tests device 3 respectively，Wherein，DC break down voltage battery of tests device 2 includes the first booster power cabinet 21、DC generator times pressure cylinder 22 and the first bleeder circuit，The outfan of the first booster power cabinet 21 is connected to left fracture through DC generator times pressure cylinder 22，One end of first bleeder circuit is connected between DC generator times pressure cylinder 22 and left fracture，Other end ground connection，First bleeder circuit includes the impedance R1 and impedance R2 of series connection，This first bleeder circuit also concatenates one first ammeter，At the two ends of impedance R2 and connect one first voltmeter；Ac voltage withstanding battery of tests device 3 includes the second booster power cabinet 31, Industrial Frequency Transformer 32 and the second bleeder circuit, the outfan of the second booster power cabinet 31 is connected to right fracture through Industrial Frequency Transformer 32, one end of second bleeder circuit is connected between Industrial Frequency Transformer 32 and right fracture, other end ground connection, second bleeder circuit at least includes the capacitor of two concatenations, this second bleeder circuit also concatenates one second ammeter, at the two ends of capacitor at ground connection place and connect one second voltmeter.
A protective resistance R3 is also concatenated between DC generator times pressure cylinder 22 and left fracture; one end of first bleeder circuit is connected between DC generator times pressure cylinder 22 and protective resistance R3; also concatenating a protective resistance R4 between Industrial Frequency Transformer 32 and right fracture, one end of the second bleeder circuit is connected between Industrial Frequency Transformer 32 and protective resistance R4.
Two, each element introduction in test connection loop
1, additional protective resistance R3 and R4: be not less than the water resistance of 1M Ω, be connected on respectively in ac circuit and the DC loop of breaker fracture both sides, plays the effect preventing test loop from overcurrent occur when test specimen is breakdown.
2, test specimen: double-fracture porcelain knob breaker, is generally used for alternating current filter chopper and is the double-fracture porcelain knob breaker of 220kV and ratings above.
3, DC break down voltage battery of tests device:
1) principle of device
Complexes product key component: 1. booster power cabinet: High voltage output scope selects different gear according to actual needs, after receiving boost instruction, the variable square wave power of output amplitude is to DC generator times pressure cylinder；2. times pressure cylinder: by square wave power through the built-in intermediate-frequency transformer boosting of times pressure cylinder, export high pressure then through pressure cylinder internal body diodes rectification again；3. impedance is measured: high direct voltage voltage is measured.
Its operation principle and work process are as follows:
1. input power is pre-steady: owing to line voltage has fluctuation, so first by the supply voltage DC low voltage power supply that stable output needs in advance, owing to needing to meet the output area of ultra-wide, it is therefore an objective to reduce power network fluctuation amplitude and major loop is exported direct current impact；
2. copped wave boosting (low pressure feedback): by steady in advance low-voltage dc power supply through the mode that copped wave is boosted export can the out-put supply of zero, to export low pressure for feedback signal, it is therefore an objective to export the high stable DC low voltage power supply that can regulate；
3. copped wave boosting (high-voltage feedback): the mode that high stable DC low voltage power supply boosts through copped wave is exported low-tension supply, with high tension voltage for feedback signal, it is therefore an objective to the fluctuation of high tension voltage can be automatically adjusted output high stable DC low voltage power supply；
4. bridge type inverse: high stable DC low voltage power supply is reverse into the adjustable square wave power of amplitude；
5. intermediate-frequency transformer, high pressure times pressure cylinder, measuring cylinder: square wave power is boosted through intermediate-frequency transformer, high pressure is exported then through pressure cylinder rectification again, multiplication of voltage adopts doube bridge arm output (reduction ripple factor), high-tension measurement and high-pressure sampling signal to adopt the high-tension resistive of high precision high stability degree Low Drift Temperature.
2) important technological parameters of complexes is as follows:
1. working power: AC380V ± 10%50Hz three-phase three-wire system
2. place to use: room inside/outside
3. operating ambient temperature :-15 DEG C～45 DEG C
4. relative humidity: be not more than 90% (without condensation, 25 DEG C)
5. height above sea level :≤3000 meters (multiplication of voltage insulating cylinder and potentiometer insulating cylinder band shirt rim, inside fill SF6 gas, it is ensured that indoor outer use under High aititude)
6. maximum temperature difference per day: 30 DEG C
7. gradation for surface pollution: III grade
8. maximum wind velocity: 35m/s
9. earthing mode: be directly grounded
3) High voltage output rated voltage
Output voltage polarity, ± 0～400kV (single-unit use) is changed by overturning a times pressure cylinder positive-negative polarity；± 0～800kV (binodal use)；± 0～1200kV (three joints use).
4) High voltage output rated current
One joint uses output 20mA；Two joints use output 15mA；Three joints use output 10mA
1. High voltage output rated power: >=12kW
2. High voltage output ceiling voltage: 1.1 times of rated voltages (zero load) 10 minutes
3. voltage measurement accuracy: 1.0% (full scale) ± 1 word
5) voltage-regulation mode
Output voltage is started from scratch boosting, voltage-regulation smooth steady, adopts thick, fine tuning mode, and thick, fine tuning potentiometer adopts import ten to enclose potentiometer, and the fineness adjustment of output voltage is better than 0.1%.
6) current measurement precision
Can normal operation under strong-electromagnetic field disturbed condition, it is ensured that the measuring accuracy of high-pressure side leakage current.
1. low-pressure side current measurement adopts fluid drive mode, total current certainty of measurement 1.0% (full scale) ± 2 word.
2. one HV-B type infrared telemetry multifunctional DC high voltage microammeter of configuration, the receptor that can pass through on times pressure cylinder footing receives high voltage side current, and on cabinet display screen, directly read high-pressure side leakage current values, range ability 0～10000uA, 1.0% ± 2 word of precision.
3. operation control box has spark gap low-pressure side leakage current testing function (causing operation control box from spark gap low-pressure end to measure), adopts fluid drive mode, certainty of measurement 1.0% (full scale) ± 2 word.
7) protection feature
There is multi-protective function, as: low press through stream, low pressure overvoltage, high-pressure and overflowing, high pressure overvoltage, zero position protection etc., be furnished with special current-limiting resistance, it is ensured that when test product electric discharge or over the ground electric discharge, current-limiting resistance does not damage, and protects instrument safety.
Various automatic safety devices have enough capacity of resisting disturbance, and when can guarantee that high voltage direct current generator normal operation, automatic safety device does not have misoperation to produce.
8) SF of 0.2Mpa is filled in times pressure cylinder6Gas, makes to put without office in times pressure cylinder, improves stability；Band Pressure gauge on times pressure cylinder, has check valve fast interface, and is furnished with inflated hose, it is simple to inflation.
4, ac voltage withstanding complexes
1) complete set of equipments parameter
Rated operation frequency: 50Hz
Pressure regulator input voltage: 0.38kV ± 10%
Specified input current: 210.5A
Rated output voltage: 800kV
Output-current rating: 4A
Test specimen capacitance range: 5000pF (voltage divider capacitance amount)～21221pF under 600kV voltage
2500pF (voltage divider capacitance amount)～18000pF under 800kV voltage
Complete set of equipments quality factor: Q >=40
Complete set of equipments certainty of measurement: virtual value 1 grade
Complete set of equipments partial discharge quantity: under 100% rated voltage≤10pC, under 70% rated voltage≤3pC
Complete set of equipments irregularity of wave form: < 1%
Complete set of equipments noise level :≤65dB (when 100% rated voltage, 100% rated current)
Dielectric level: pressure 1min under 1.1 times of rated voltages
2) booster power cabinet
Rated operation frequency: 50Hz
Rated capacity: 80kVA
Nominal input voltage: 0.38kV
Specified input current: 210.5A
Rated output voltage: 0～0.42kV
Irregularity of wave form: < 3%
Voltage regulating mode: electronic pressure regulation
3) Industrial Frequency Transformer includes: excitation becomes, and adjusts sense reactor, and parameter is as follows respectively:
1. excitation becomes
Rated operation frequency: 50Hz
Rated capacity: 80kVA
Nominal input voltage: 0.38kV × 2 (can go here and there can be also)
Specified input current: 105.3A × 2
Rated output voltage: 20kV (during 10kV (tap voltage) input voltage parallel connection 0.38kV)/10kV (during 5kV (tap voltage) input voltage parallel connection 0.38kV)
Output-current rating: 4A/8A
Impedance voltage: < 5%
The type of cooling: ONAN
2. compensation reactor (can connect for 3)
Rated operation frequency: 50Hz
Rated capacity: 1200kVA
Rated voltage: 300kV
Rated current: 4A
Irregularity of wave form: < 1%
Temperature limit: under rated current service condition, oil average temperature rising is not more than 45K, and coil temperature rise is not more than 65K
Nominal inductance amount: 238.7H (load capacity is 42442pF to the maximum and includes capacitive divider electric capacity)～1351H (load capacity is capacitive divider and tuning capacity 7500pF)
Noise level :≤65dB (when 100% rated voltage, 100% rated current)
Quality factor: Q >=60
Adjust sensing mode: electronic stepless adjustable
4) potentiometer
Rated voltage: 800kV (is formed by three grades, every step voltage respectively 300kV, 300kV, 200kV, for the rated voltage of 500KV, then two grades of capacitors can be adopted to carry out dividing potential drop, i.e. capacitor C1 shown in Fig. 1 and capacitor C2)
Rated capacitance: 2500pF (single-stage rated capacitance 7500pF)
Operating frequency: 20～300Hz
Certainty of measurement :≤1%
Dielectric loss: tg σ < 0.2%)
Dividing potential drop mode: purely capacitive dividing potential drop
Dielectric level: pressure 1min under 1.1 times of rated voltages
Base: have enough degree of stability, can regulate level, demolition, installation conveniently, and is easy to mobile equipped with caster.
Three, testing program
Relevant regulations according to DL/T620-1997 " overvoltage protection of alternating-current electric device and Insulation Coordination ": line-breaker bus bar side power-frequency voltage is no more than 1.3p.u.; therefore test specimen AC overvoltage respectively 1.1p.u. is considered; 1.15p.u.; the operating mode of 1.2p.u. and 1.3p.u.; owing to tested DC voltage is the peak value of alternating voltage; and cut-off existence positive peak and two kinds of situations of negative peak of moment alternating voltage, namely
+ Shu √ 2U~Shu ,-Shu √ 2U~Shu, below for the chopper test specimen of 500kV rated voltage, line voltage is 550kV, phase voltage is that 550/ √ 3=318kV is (if being the chopper of 220kV rated voltage, then, line voltage is 252kV, and phase voltage is 145kV), test specimen alternating current-direct current side is applied the order of test voltage (including positive polarity and negative polarity) respectively as shown in Tables 1 and 2.
Table 1 positive polarity voltage-withstand test and tolerance time
Table 2 negative polarity voltage-withstand test and tolerance time
Four, test procedure
(1) before carrying out chopper alternating current-direct current mixing pressure test, reply test specimen carries out megger test, it is ensured that test specimen insulation resistance meets the related request of GB50150.
(2) according to Fig. 1 test connection figure, assay device high-voltage connection is connected test specimen, connect alternating current-direct current mixing pressure-resistant apparatus power supply.
(3) first by DC break down voltage assay device test voltage respectively according to table 1, the order of table 2 pressure point pressurizes, when reaching each pressure point institute target direct current target voltage (with reference to Section of three testing program), keep this magnitude of voltage, wait that ac voltage withstanding device boosts to the exchange target voltage values corresponding to table pressure point, start timing, pressure-resistant time 60s, after pressure, DC break down voltage assay device continues boosting according to pressure point next one order target voltage, then keep, wait that ac voltage withstanding device boosts to the target voltage that next order is corresponding, start timing, the rest may be inferred below, when there is not disruptive discharge in test specimen, until till last pressure point.
(4) then carry out ac voltage withstanding device adjusting sense, guarantee that test loop forms resonance under power-frequency voltage, then (or close to zero) starts boosting from zero, start uniformly to boost from 75% voltage, boost process is paid close attention to high tension loop, after rising to exchange setting voltage, and keep.
(5) in alternating current-direct current mixing pressure test process, as occurred without disruptive discharge, then it is assumed that pass through pressure test.In boosting and pressure process, as found, assay device ammeter and voltmeter pointer significantly swing (it is generally acknowledged that amplitude of fluctuation reaches 1/3 of respective table range and thinks significantly to swing), boosting blood pressure lowering rapidly should be stopped immediately, ascertain the reason after power failure.
(6), after off-test, should adopt discharge resistance that tested chopper is substantially discharged.
Five, result of the test judges and analyzes
In testing pressure process, when find breaker fracture send " " a sound, there may come a time when that can see one white light flashes from test specimen surface, first voltmeter simultaneously, second voltmeter, significantly swinging occurs in one of them pointer value of first ammeter and the second ammeter, DC experiment magnitude of voltage now and ac test magnitude of voltage are chopper and puncture flashover voltage in alternating current-direct current operating mode, in order to prevent result of the test from there is randomness and dispersibility, after the test specimen scouring pad immersion acetone or ethanol that there occurs flashover can being carried out surface cleaning process, repeat to carry out this test 3 times, and take and maximum and minimum puncture the flashover voltage alternating current-direct current insulating properties performance value as chopper.If chopper is examined respectively through the test voltage of table 1, table 2, even if then proving that chopper occurs cut-offfing alternating current filter group under the operating mode of 1.3 times of overvoltage in system, its insulating properties also complete to bear the examination from breaker fracture two ends alternating current-direct current mixed-voltage.
Six, certain DC converter station 500kV584B chopper alternating current-direct current mixing pressure test example
1) 584B phase chopper AC/DC mixing pressure test (negative polarity)
Alternating current filter 584B phase chopper is carried out direct current negative polarity alternating current-direct current mixing pressure test, applies alternating voltage at fracture 2, apply direct current reverse voltage at fracture 1, often the group pressure 60s of voltage.
Test all through.
2) 584B phase chopper AC/DC mixing pressure test (positive polarity)
Alternating current filter 584B phase chopper being carried out straight polarity alternating current-direct current mixing pressure test, applies alternating voltage at fracture 2, apply straight polarity voltage at fracture 1, often the group pressure 60s of voltage, test result is as shown in table 3.
Table 3 straight polarity alternating current-direct current mixing pressure test result
On-the-spot carrying out direct current 520kV with when exchange 366kV mixing pressure test, appearance in the 7th second is discharged the sound, hear " " a sound, but do not find obvious electrical discharge arc.
Site inspection chopper outward appearance, does not find that arc-extinguishing chamber of circuit breaker and equalizing capacitor surface exist spark tracking, and breaker fracture carries out insulation measurement, and fracture 2 insulation resistance is 43.7G Ω, and fracture 1 insulation resistance is 48.7G Ω.All meet regulatory requirements, it is judged that chopper, under alternating current-direct current mixing pressure test voltage, the insulation breakdown of self recovery occurs.
According to above-mentioned data analysis, can determine whether that 584B phase is under negative polarity d. c voltage mixes with ac test voltage, the ability of 1.3 times of system overvoltages can be born, and under positive polarity DC voltage mixes with ac test voltage, it punctures flashover voltage value and declines comparatively obvious, for DC voltage+518kV, alternating voltage 366kV.
Although the present invention is illustrated by specific embodiment, it will be appreciated by those skilled in the art that, without departing from the present invention, it is also possible to the present invention is carried out various conversion and equivalent replacement.It addition, for particular condition or application, it is possible to the present invention is made various amendment, without deviating from the scope of the present invention.Therefore, the present invention is not limited to disclosed specific embodiment, and should include the whole embodiments falling within the scope of the claims in the present invention.
Claims (6)
- null1. an alternating current filter chopper alternating current-direct current mixes pressure connection circuit，It is characterized in that，It includes chopper (1)、Three headers (4)、Pillar (5)、DC break down voltage battery of tests device (2) and ac voltage withstanding battery of tests device (3)，Described three headers (4) are connected to the middle part of chopper (1)，The two ends of chopper (1) form left fracture and right fracture respectively，The downside connecting struts (5) of described three headers (4)，Described left fracture and right fracture connect DC break down voltage battery of tests device (2) and ac voltage withstanding battery of tests device (3) respectively，Wherein，Described DC break down voltage battery of tests device (2) includes the first booster power cabinet (21)、DC generator times pressure cylinder (22) and the first bleeder circuit，The outfan of described first booster power cabinet (21) is connected to left fracture through DC generator times pressure cylinder (22)，One end of described first bleeder circuit is connected between DC generator times pressure cylinder (22) and left fracture，Other end ground connection，Described first bleeder circuit includes the impedance R1 and impedance R2 of series connection，This first bleeder circuit also concatenates one first ammeter，At the two ends of impedance R2 and connect one first voltmeter；Described ac voltage withstanding battery of tests device (3) includes the second booster power cabinet (31), Industrial Frequency Transformer (32) and the second bleeder circuit, the outfan of described second booster power cabinet (31) is connected to right fracture through Industrial Frequency Transformer (32), one end of described second bleeder circuit is connected between Industrial Frequency Transformer (32) and right fracture, other end ground connection, described second bleeder circuit at least includes the capacitor of two concatenations, this second bleeder circuit also concatenates one second ammeter, at the two ends of capacitor at ground connection place and connect one second voltmeter.
- 2. alternating current filter chopper alternating current-direct current according to claim 1 mixes pressure connection circuit; it is characterized in that; a protective resistance R3 is also concatenated between described DC generator times pressure cylinder (22) and left fracture; one end of described first bleeder circuit is connected between DC generator times pressure cylinder (22) and protective resistance R3; also concatenating a protective resistance R4 between described Industrial Frequency Transformer (32) and right fracture, one end of described second bleeder circuit is connected between Industrial Frequency Transformer (32) and protective resistance R4.
- 3. alternating current filter chopper alternating current-direct current according to claim 2 mixes pressure connection circuit, it is characterised in that described protective resistance R3 and protective resistance R4 is the water resistance that resistance is not less than 1M Ω.
- 4. alternating current filter chopper alternating current-direct current according to claim 1 mixes pressure connection circuit, it is characterised in that be filled with the SF of 0.2Mpa in described DC generator times pressure cylinder (22)6Gas.
- 5. the pressure connection circuit of alternating current filter chopper alternating current-direct current according to claim 1 mixing realizes the test method that the mixing of chopper alternating current-direct current is pressure, it is characterised in that it comprises the following steps:Step 1, positive polarity are tested, and it comprises the following steps:Step 11, by the first booster power cabinet (21), DC break down voltage battery of tests device (2) is boosted, when the output voltage values of DC break down voltage battery of tests device (2) reaches the √ 2 times of chopper (1) phase voltage, keep the output voltage values of this DC break down voltage battery of tests device (2)；Step 12, tune sense reactor to Industrial Frequency Transformer (32) carry out adjusting sense, ensure that ac voltage withstanding battery of tests device (3) forms resonance under power-frequency voltage, then the second booster power cabinet (31) is started from scratch boosting, start uniformly boosting from the output voltage values of ac voltage withstanding battery of tests device (3) is chopper (1) phase voltage 75%；Step 13, when reaching 1 times of chopper (1) phase voltage, 1.1 times, 1.15 times, 1.2 times and 1.3 times when the output voltage values of ac voltage withstanding battery of tests device (3), ac voltage withstanding battery of tests device (3) is all made to keep this corresponding output voltage values 60s, if chopper (1) occurs without disruptive discharge, then by corresponding positive polarity pressure test；When ac voltage withstanding battery of tests device (3) boosts or keeps in corresponding output voltage values process, if there is the first voltmeter, the second voltmeter, the first ammeter and the second ammeter one of them pointer value occur significantly swing, then positive polarity pressure test is not passed through；Step 2, negative polarity are tested, and it comprises the following steps:Step 21, by the first booster power cabinet (21), DC break down voltage battery of tests device (2) is boosted, when the output voltage values of DC break down voltage battery of tests device (2) reaches-√ 2 times of chopper (1) phase voltage, keep the output voltage values of this DC break down voltage battery of tests device (2)；Step 22, tune sense reactor to Industrial Frequency Transformer (32) carry out adjusting sense, ensure that ac voltage withstanding battery of tests device (3) forms resonance under power-frequency voltage, then the second booster power cabinet (31) is started from scratch boosting, start uniformly boosting from the output voltage values of ac voltage withstanding battery of tests device (3) is chopper (1) phase voltage 75%；Step 23, when reaching 1 times of chopper (1) phase voltage, 1.1 times, 1.15 times, 1.2 times and 1.3 times when the output voltage values of ac voltage withstanding battery of tests device (3), ac voltage withstanding battery of tests device (3) is all made to keep this corresponding output voltage values 60s, if chopper (1) occurs without disruptive discharge, then by corresponding negative polarity pressure test；When ac voltage withstanding battery of tests device (3) boosts or keeps in corresponding output voltage values process, if there is the first voltmeter, the second voltmeter, the first ammeter and the second ammeter one of them pointer value occur significantly swing, then negative polarity pressure test is not passed through.
- 6. test method according to claim 5, it is characterized in that, in positive polarity or negative polarity voltage-withstand test process of the test, if the left fracture of chopper or right fracture occur " " a sound, simultaneously significantly swinging occurs in one of them pointer value of the first voltmeter, the second voltmeter, the first ammeter and the second ammeter, and the now corresponding output voltage values of DC break down voltage battery of tests device (2) and the output voltage values of ac voltage withstanding battery of tests device (3) are chopper and puncture flashover voltage in alternating current-direct current operating mode.
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