CN102901925A - Method for testing characteristic parameter of conversion loop of direct current circuit breaker with extra and ultra-high voltage - Google Patents
Method for testing characteristic parameter of conversion loop of direct current circuit breaker with extra and ultra-high voltage Download PDFInfo
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Abstract
The invention discloses to a method for testing characteristic parameters of a conversion loop of a direct current circuit breaker with extra and ultra-high voltage, which relates to a method for testing the characteristic parameters of the conversion loop of a passive oscillation circuit and an active oscillation circuit of the direct current circuit breaker with the extra and ultra-high voltage. According to different charging voltage (passive) or different charging time (active) of a changeover condenser group, a wave form of the current I of the conversion loop, which is collected and obtained by operating the breaker, is operated, the frequency f and the decay time constant Tau of the conversion loop are respectively obtained, and finally, the characteristic parameters of the conversion loop within a certain range are obtained. The sum of the reactor inductance of the conversion loop (the conversion loop is provided, and a reactor is not provided), the condenser inductance and the line inductance forms the inductance L of the conversion loop, which is equal to 1/(2*pi*f)<2>*C, and the damping resistance R of the conversion loop is equal to 2L/Tau.
Description
Technical field
The present invention relates to characterisitic parameter method of testing, particularly UHV (ultra-high voltage), the extra-high voltage direct-current isolating switch conversion loop characterisitic parameter method of testing of electric system mesohigh dc circuit breaker.
Background technology
Super, extra-high voltage direct-current transmission engineering current conversion station dc fields high voltage DC breaker is the visual plant of current conversion station dc fields, mainly comprises neutral bus switch (NBS), turns metallic(return) circuit switch (MRTB), turns ground return circuit switch (GRTS) etc.They play a part switch, are mainly used in the conversion of the various methods of operation of DC transmission system, such as earthed system conversion, fault handling etc.Electric arc is difficult for extinguishing in the fracture because DC current makes without the natural zero-crossing point, therefore AC circuit breaker can not be directly used in breaking direct current, must adopt the high voltage DC breaker that is formed by AC circuit breaker and conversion loop to realize effectively cut-offfing of DC current, especially realize that in super, extra-high voltage direct-current system reliably effectively cut-offfing of DC current is most important especially.In recent years, high voltage dc transmission technology in China's development rapidly, become the developing direction of remote conveying electric energy, for guaranteeing the current conversion station dc fields with the reliable breaking direct current effectively of high voltage DC breaker, the oscillation circuit characterisitic parameter test of high voltage DC breaker is carried out at the scene of being necessary.
High voltage DC breaker is actual to be by AC circuit breaker and conversion loop (LC self-sustained oscillation loop, lightning arrester group (absorbed energy in the transfer process)) formation in parallel, LC self-sustained oscillation loop is divided into passive and active type, and the principle of its breaking direct current is the same.It is to utilize arc voltage to increase the non-linear negative resistance property that descends with electric current that direct current cut-offs, and produces self-sustained oscillation in the LC loop in parallel with arc gap again, makes flame current be superimposed with the divergent oscillation electric current, realizes cut-offfing when the total current zero passage.Therefore, requiring AC circuit breaker to have preferably with the parameter in conversion loop (LC self-sustained oscillation) cooperates.
Because super, the extra-high voltage direct-current transmission technology is relatively not long in the time that China uses, at present electric system is super, this project is not explicitly called in the handing-over of extra-high voltage direct-current transmission engineering current conversion station, items for acceptance, also just not regulation for high voltage DC breaker conversion loop characterisitic parameter method of testing.
Summary of the invention
The purpose of this invention is to provide the method that a kind of test result is tested the conversion loop characterisitic parameter of super, extra-high voltage direct-current isolating switch passive and active type oscillation circuit accurately and reliably.
The object of the present invention is achieved like this: a kind of characterisitic parameter method of testing of super, extra-high voltage direct-current isolating switch conversion loop, comprise, high voltage DC breaker is composed as follows: in parallel with lightning arrester BL and form the conversion loop behind the changeover condenser group tandem reactor H, high-voltage AC breaker CB is in parallel with lightning arrester group BL; It is characterized in that, carry out according to the following steps:
1) when described high-voltage AC breaker "on" position, after the changeover condenser group carried out safety ground, untie the drainage thread terminal that high-voltage AC breaker connects described reactor H, after the drainage thread of untiing passed Luo-coil CT, recover and fastening this terminal, the signal output part with Luo-coil CT connects oscillograph again;
2) the characterisitic parameter method of testing to passive conversion loop is as follows:
Adopt external dc charging power supply U, the positive and negative electrode of this power supply U is connected to changeover condenser group two ends behind charge switch SW1, and preparation is charged to the changeover condenser group; When high-voltage AC breaker CB "on" position, carry out the wiring of external dc charging power supply U, after wiring is finished, operate high pressure AC circuit breaker separating brake;
Voltage table V monitoring charging voltage by dc charging power supply U charges to 200V, 400V, 500V, 600V, 800V and 1000V to the changeover condenser group respectively; Under the above-mentioned different charging voltage stationary values of changeover condenser group, turn off charge switch SW1 makes dc charging power supply U break away from the changeover condenser group;
Respectively under the above-mentioned different charging voltage of changeover condenser group, the operate high pressure AC circuit breaker closes a floodgate, make the conversion loop that self-sustained oscillation occur, gather the self-sustained oscillation current waveform by oscillograph, thereby obtain changing the loop frequency f, change the loop inductance L, convert back roadlock buffer resistance R and change the loop electric current I;
The conversion loop inductance is reactor inductance, capacitor inductance and line inductance sum;
3) the characterisitic parameter method of testing to active type conversion loop is as follows:
Charging device E is in parallel with the changeover condenser group, and single-pole switch S is serially connected between changeover condenser group and the reactor H;
When the characterisitic parameter in active type conversion loop is tested, the artificial single-pole switch S that disconnects, allow charging device E that the changeover condenser group is carried out respectively 1s, 5s, 10s, 30s, the charging of 60s time, after each charging is finished, manually make respectively single-pole switch S closed, high-voltage AC breaker is closed a floodgate, gather the self-sustained oscillation current waveform by oscillograph, thereby obtain changing recirculating loop frequency
f, the conversion loop inductance
L, convert back the roadlock buffer resistance
RAnd conversion loop current
I;
4) characterisitic parameter of changing the loop calculates:
To above-mentioned passive and active type conversion loop, directly measure the capacitance of changeover condenser group
C
According to above-mentioned different charging voltages or the conversion loop current waveform that collects of above-mentioned different duration of charging under the active type condition under the passive condition of changeover condenser group, obtain respectively changing the frequency in loop
fAnd damping time constant
τ, Then finally obtain determining the conversion loop characterisitic parameter of scope;
Conversion loop inductance L is:
Conversion loop inductance L is reactor inductance, capacitor inductance and line inductance sum;
The damping resistance R in conversion loop is:
Described method of testing is characterized in that, when the characterisitic parameter in active type conversion loop was tested, described external dc charging power supply U also was parallel with the monitoring voltage Table V.
Described oscillograph model is Tektronix DPO3012, and the Luo-coil model is CL-2000, and external dc charging power supply model is SCDC1000/10.
The invention has the beneficial effects as follows: high voltage DC breaker be surpass, the visual plant of extra-high voltage direct-current transmission engineering current conversion station dc fields, play a part switch.Super, extra-high voltage converter stands in that the earth returns or metal returns when changing between the different running method, need to cut-off also thousands of amperes direct current transfer current, although high-voltage AC breaker has the very strong ability of cut-offfing short-circuit current, but because DC current has zero crossing unlike alternating current, so breaker fracture is difficult to the blow-out cutout.In order to strengthen direct current blow-out cutout ability, conversion loop in parallel between the AC circuit breaker fracture can breaking direct current by AC circuit breaker to make current zero-crossing point.In order to guarantee reliably breaking direct current of dc circuit breaker, the characterisitic parameters such as the frequency in conversion loop, damping resistance must carry out field measurement, to guarantee that it meets the design and use requirement, guarantee that super, extra-high voltage direct-current transmission engineering current conversion station can move safely and reliably in the different modes transfer process.
The extra-high-speed pressure energy promotes the transport capacity of China's electrical network greatly.The data that provide according to State Grid Corporation of China show that a loop extra-high voltage direct-current electrical network can send 6,000,000 kilowatts of electric weight, are equivalent to 5 to 6 times of existing 500 Kilovolt Direct Current nets, and to send electrical distance also be 2 to 3 times of the latter, so efficient improves greatly.In addition, according to State Grid Corporation of China's measuring and calculating, carry the electric weight of same power, can be than the land resource that adopts 500 kilovolts of supertension lines savings 60% if adopt extra high voltage line to transmit electricity.Mention in country's " 12 " planning outline, adapt to the requirement that extensive transregional transmission of electricity and generation of electricity by new energy are incorporated into the power networks, accelerate the modern power network System Construction, further enlarge the transferring electricity from the west to the east scale, improve regional trunk electrical network, large capacity, high-level efficiency, the remote advanced technology of transmission of electricitys such as development is super, extra-high voltage, Sichuan is as the abundant large province of water power of clean energy resource, following development all will depend on the construction extra-high voltage grid, so the present invention also is based on better services in purpose super, UHV Transmission Engineering.
The method and device adopt the current sensor CT of Luo-coil, the conversion loop characterisitic parameter of having avoided the access type testing current devices such as shunt to bring changes problem, the saturated defective of electromagnetic current transducer, the shortcoming that the Hall element temperature is floated, the precision responding range is narrow and the moment need to calibrate.The method and device are successfully applied to by the inventor in the on-the-spot commissioning test of high voltage DC breaker of " silk screen-southern Jiangsu extra-high voltage direct-current transmission engineering ± 800kV Yue Loong current conversion station ".
Description of drawings
Fig. 1 is passive high voltage DC breaker conversion of the present invention loop circuit theory diagrams (being the conversion loop in the dotted line frame).
Fig. 2 is active type dc circuit breaker conversion of the present invention loop circuit theory diagrams.
Fig. 3 is circuit (passive) schematic diagram of the external dc charging power supply in conversion shown in Figure 1 loop.
Fig. 4 is the waveform figure of the present invention ± actual test of 800kV Yue Loong current conversion station.
Embodiment
1) referring to Fig. 3, when tested breaker closing state, changeover condenser group C carried out safety ground after, untie tested isolating switch and connect the drainage thread terminal that converts back channel platform, the drainage thread of untiing is passed Luo-coil CT after, recover again and fastening this terminal.Be that isolating switch to the connecting line that converts back channel platform has passed Luo-coil CT.
Adopt the current sensor CT of Luo-coil, the conversion loop characterisitic parameter of having avoided the access type testing current devices such as shunt to bring changes problem, the saturated defective of electromagnetic current transducer, the shortcoming that the Hall element temperature is floated, the precision responding range is narrow and the moment need to calibrate.
2) characterisitic parameter in passive conversion loop is tested, referring to Fig. 3.
Adopt external dc charging power supply U, its positive and negative electrode is connected to changeover condenser group C two ends behind charge switch SW1, and preparation is charged to changeover condenser group C.When tested isolating switch CB "on" position, carry out external dc charging power supply U wiring, after wiring is finished, operate tested breaker open operation.
Voltage table V monitoring charging voltage by dc charging power supply U charges to 200V, 400V, 500V, 600V, 800V and 1000V to changeover condenser group C respectively.Under the different charging voltage stationary values of changeover condenser group C, turn off charge switch SW1 makes dc charging power supply E break away from changeover condenser group C.
Respectively under the different charging voltage of changeover condenser group C, operating tested isolating switch CB closes a floodgate, the i.e. dynamic and static contact closure of main fracture, the changeover condenser group makes the conversion loop that self-sustained oscillation occur with the conversion loop inductance, gather self-sustained oscillation current waveform (referring to Fig. 4) by waveform acquisition equipment (such as digital storage oscilloscope), thereby obtain changing the loop frequency f, change the loop inductance L, convert back roadlock buffer resistance R and change the loop electric current I.
The conversion loop inductance is reactor inductance (the conversion loop being arranged without reactor), capacitor inductance and line inductance sum.
3) characterisitic parameter in active type conversion loop is tested, referring to Fig. 2.
For passive, it has charging device and single-pole switch S(to see Fig. 2).Single-pole switch S disconnects during normal operation, and charging device E is to the charging of changeover condenser group, and during breaker open operation, single-pole switch S is closed after the dynamic and static contact of its main fracture separates 15ms-25ms, changeover condenser group and the self-sustained oscillation of conversion loop inductance.
When the characterisitic parameter in conversion loop is tested, allow charging device E that changeover condenser group C is carried out the charging of different time, after charging is finished, manually make single-pole switch S closed, make again tested breaker closing, be the dynamic and static contact closure of its main fracture, gather the self-sustained oscillation current waveform by waveform acquisition equipment (such as digital storage oscilloscope), thereby obtain changing recirculating loop frequency
f, the conversion loop inductance
L, convert back the roadlock buffer resistance
RAnd conversion loop current
I
When the characterisitic parameter in conversion loop is tested, the charging device subsidiary control loop, allow charging device E the changeover condenser group be carried out respectively the charging of 1s, 5s, 10s, 30s, 60s equal time, after each charging is finished, manually make respectively single-pole switch S closed, tested breaker closing again, the dynamic and static contact closure of main fracture CB, gather the self-sustained oscillation current waveform by waveform acquisition equipment (such as digital storage oscilloscope), thereby obtain changing recirculating loop frequency
f, the conversion loop inductance
L, convert back the roadlock buffer resistance
RAnd conversion loop current
I
4) characterisitic parameter of changing the loop calculates.
No matter passive and active type conversion loop all can directly measure conversion loop capacitor group capacitance
C
The conversion loop current that collects according to the different charging voltages (passive) of changeover condenser group or different duration of charging (active type)
IWaveform obtains respectively changing the frequency in loop
fAnd damping time constant
τ Then finally obtain determining the conversion loop characterisitic parameter of scope.
Conversion loop reactor inductance (the conversion loop being arranged without reactor), changeover condenser inductance and line inductance sum are
The damping resistance in conversion loop is
5) the characterisitic parameter measuring and calculation example in conversion loop.
Through measuring conversion loop changeover condenser group electric capacity
C=60 μ F;
The time that can be got five concussion cycles of switching current by Fig. 4 is 984 μ s;
So conversion loop oscillation frequency
f=5081Hz;
Damping time constant τ=0.684ms;
Conversion oscillation circuit inductance by
Calculate 16 μ H;
The conversion loop damping resistance by
Calculate 46m.
The major function of this device and technical indicator:
Major function: a kind of conversion loop characterisitic parameter method of testing to super, extra-high voltage direct-current isolating switch passive and active type oscillation circuit is provided.Thereby obtain changing loop frequency f, conversion loop inductance L, convert back roadlock buffer resistance R and conversion loop electric current I.
Super, extra-high voltage direct-current isolating switch conversion loop characteristic parameter testing device technical indicator:
Dc charging power supply voltage: 0～1000V;
Dc charging power supply electric current: 0～10A;
Dc charging power supply output accuracy: 0.1%;
The dc charging power supply temperature is floated: 0.05%/℃;
Float during dc charging power supply: 0.05%/h;
Waveform acquisition equipment (oscillograph): 100MHz/2.5GS/s;
Current sensor (Luo-coil): 2000A
Current sensor transduction factor: 0.059.
The parameter of device major equipment:
Oscillograph CRT: model Tektronix DPO3012;
Current sensor (Luo-coil): model C L-2000
Digital multimeter: model FLUKE8845A;
Dc charging power supply (by the access of 1 place of interrupteur SW among Fig. 3): model SCDC1000/10.
Claims (3)
1. super, extra-high voltage direct-current isolating switch conversion loop characterisitic parameter method of testing, comprise, high voltage DC breaker is composed as follows: in parallel with lightning arrester BL and form the conversion loop behind the changeover condenser group tandem reactor H, high-voltage AC breaker CB is in parallel with lightning arrester group BL; It is characterized in that, carry out according to the following steps:
1) when described high-voltage AC breaker "on" position, after the changeover condenser group carried out safety ground, untie the drainage thread terminal that high-voltage AC breaker connects described reactor H, after the drainage thread of untiing passed Luo-coil CT, recover and fastening this terminal, the signal output part with Luo-coil CT is connected to oscillograph again;
2) the characterisitic parameter method of testing to passive conversion loop is as follows:
Adopt external dc charging power supply U, the positive and negative electrode of this power supply U is connected to changeover condenser group two ends behind charge switch SW1, and preparation is charged to the changeover condenser group; When high-voltage AC breaker CB "on" position, carry out the wiring of external dc charging power supply U, after wiring is finished, operate high pressure AC circuit breaker separating brake;
Voltage table V monitoring charging voltage by dc charging power supply U charges to 200V, 400V, 500V, 600V, 800V and 1000V to the changeover condenser group respectively; Under the above-mentioned different charging voltage stationary values of changeover condenser group, turn off charge switch SW1 makes dc charging power supply U break away from the changeover condenser group;
Respectively under the above-mentioned different charging voltage of changeover condenser group, the operate high pressure AC circuit breaker closes a floodgate, make the conversion loop that self-sustained oscillation occur, gather the self-sustained oscillation current waveform by oscillograph, thereby obtain changing the loop frequency f, change the loop inductance L, convert back roadlock buffer resistance R and change the loop electric current I;
The conversion loop inductance is reactor inductance, capacitor inductance and line inductance sum;
3) the characterisitic parameter method of testing to active type conversion loop is as follows:
Charging device E is in parallel with the changeover condenser group, and single-pole switch S is serially connected between changeover condenser group and the reactor H;
When the characterisitic parameter in active type conversion loop is tested, the artificial single-pole switch S that disconnects, allow charging device E that the changeover condenser group is carried out respectively 1s, 5s, 10s, 30s, the charging of 60s time, after each charging is finished, manually make respectively single-pole switch S closed, high-voltage AC breaker is closed a floodgate, gather the self-sustained oscillation current waveform by oscillograph, thereby obtain changing recirculating loop frequency
f, the conversion loop inductance
L, convert back the roadlock buffer resistance
RAnd conversion loop current
I;
4) characterisitic parameter of changing the loop calculates:
To above-mentioned passive and active type conversion loop, directly measure the capacitance of changeover condenser group
C
According to above-mentioned different charging voltages or the conversion loop current waveform that collects of above-mentioned different duration of charging under the active type condition under the passive condition of changeover condenser group, obtain respectively changing recirculating loop frequency
fAnd damping time constant
τ, Then finally obtain determining the conversion loop characterisitic parameter of scope;
Conversion loop inductance L is:
Conversion loop inductance L is reactor inductance, capacitor inductance and line inductance sum;
The damping resistance R in conversion loop is:
2. super, extra-high voltage direct-current isolating switch conversion loop characterisitic parameter method of testing according to claim 1 is characterized in that when the characterisitic parameter in active type conversion loop was tested, described external dc charging power supply U also was parallel with the monitoring voltage Table V.
3. super, extra-high voltage direct-current isolating switch conversion loop characterisitic parameter method of testing according to claim 2, it is characterized in that, described oscillograph model is Tektronix DPO3012, and the Luo-coil model is CL-2000, and external dc charging power supply model is SCDC1000/10.
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