CN102901925B - Super, extra-high voltage direct-current isolating switch conversing circuits characterisitic parameter method of testing - Google Patents
Super, extra-high voltage direct-current isolating switch conversing circuits characterisitic parameter method of testing Download PDFInfo
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Abstract
A characterisitic parameter method of testing for super, extra-high voltage direct-current isolating switch conversing circuits, relates to the conversing circuits characterisitic parameter method of testing to super, extra-high voltage direct-current isolating switch passive and active type oscillation circuit.According to the different charging voltage (passive) of changeover condenser group or different duration of charging (active type), the conversing circuits electric current I waveform that operating breaker collects, obtains frequency f and the damping time constant τ of conversing circuits respectively.Then finally obtain the conversing circuits characterisitic parameter determining scope.Conversing circuits reactor inductance (having conversing circuits without reactor), capacitor inductance and line inductance sum composition conversing circuits inductance:
; The damping resistance of conversing circuits is
.
Description
Technical field
The present invention relates to the characterisitic parameter method of testing, particularly UHV (ultra-high voltage) of electric system mesohigh DC circuit breaker, extra-high voltage direct-current isolating switch conversing circuits characterisitic parameter method of testing.
Background technology
The visual plant super, extra-high voltage direct-current transmission engineering current conversion station DC fields high voltage DC breaker is 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 method of operation of DC transmission system, as earthed system conversion, fault handling etc.Because DC current makes electric arc in fracture not easily extinguish without natural zero-crossing point, therefore AC circuit breaker can not be directly used in breaking direct current, the high voltage DC breaker be made up of AC circuit breaker and conversing circuits must be adopted to realize effectively cut-offfing of DC current, especially realize reliably effectively cut-offfing of DC current in super, extra-high voltage direct-current system most important especially.In recent years, high voltage dc transmission technology in China's development rapidly, become the developing direction of long-distance sand transport electric energy, for ensureing the reliable breaking direct current effectively of current conversion station DC fields 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 is form by AC circuit breaker is in parallel with conversing circuits (LC self-sustained oscillation loop, lightning arrester group (absorbing energy in transfer process)), 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 the non-linear negative resistance property utilizing arc voltage to increase with electric current and decline that direct current cut-offs, then produces self-sustained oscillation in the LC loop in parallel with arc gap, makes flame current be superimposed with divergent oscillation electric current, realizes cut-offfing when total current zero passage.Therefore, require that AC circuit breaker has good cooperation with the parameter of conversing circuits (LC self-sustained oscillation).
The time applied in China due to super, extra-high voltage direct-current transmission technology is relatively not long, current electric system surpasses, the handing-over of extra-high voltage direct-current transmission engineering current conversion station, do not explicitly call for this project in items for acceptance, does not also just specify for high voltage DC breaker conversing circuits characterisitic parameter method of testing.
Summary of the invention
The object of this invention is to provide a kind of test result accurately and reliably to the method that the conversing circuits characterisitic parameter of super, extra-high voltage direct-current isolating switch passive and active type oscillation circuit is tested.
The object of the present invention is achieved like this: the characterisitic parameter method of testing of Yi Zhongchao, extra-high voltage direct-current isolating switch conversing circuits, comprise, high voltage DC breaker is composed as follows: in parallel with lightning arrester BL and form conversing circuits after 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 safety ground is carried out to changeover condenser group, untie the drainage thread terminal that high-voltage AC breaker connects described reactor H, after the drainage thread untied is passed Luo-coil CT, recover and this terminal fastening, then the signal output part of Luo-coil CT is connected oscillograph;
2) as follows to the characterisitic parameter method of testing of passive conversing circuits:
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 after charge switch SW1, prepares and charges to changeover condenser group; When high-voltage AC breaker CB "on" position, carry out the wiring of external DC charging power supply U, after wiring completes, operate high pressure AC circuit breaker separating brake;
Monitor charging voltage by the voltage table V of DC charging power supply U, respectively 200V, 400V, 500V, 600V, 800V and 1000V are charged to changeover condenser group; Under the above-mentioned different charging voltage stationary values of changeover condenser group, turn off charge switch SW1, makes DC charging power supply U depart from changeover condenser group;
Respectively under the above-mentioned different charging voltage of changeover condenser group, operate high pressure AC circuit breaker closes a floodgate, make conversing circuits generation self-sustained oscillation, gather self-sustained oscillation current waveform by oscillograph, thus obtain conversing circuits frequency f, conversing circuits inductance L, conversing circuits damping resistance R and conversing circuits electric current I;
Conversing circuits inductance is reactor inductance, capacitor inductance and line inductance sum;
3) as follows to the characterisitic parameter method of testing of active type conversing circuits:
Charging device E is in parallel with changeover condenser group, and single-pole switch S is serially connected between changeover condenser group and reactor H;
When the characterisitic parameter of active type conversing circuits is tested, artificial disconnection single-pole switch S, charging device E is allowed changeover condenser group to be carried out respectively to the charging of 1s, 5s, 10s, 30s, 60s time, after each charging complete, single-pole switch S is manually made to close respectively, make high-voltage AC breaker close a floodgate again, gather self-sustained oscillation current waveform by oscillograph, thus obtain conversing circuits frequency f, conversing circuits inductance L, conversing circuits damping resistance R and conversing circuits electric current I;
4) characterisitic parameter carrying out conversing circuits calculates:
To above-mentioned passive and active type conversing circuits, directly measure the capacitance C obtaining changeover condenser group;
According to the conversing circuits current waveform that the above-mentioned different charging voltage under passive condition of changeover condenser group or above-mentioned different duration of charging under active type condition collect, obtain frequency f and the damping time constant τ of conversing circuits respectively, then finally obtain the conversing circuits characterisitic parameter determining scope;
Conversing circuits inductance L is:
Conversing circuits inductance L is reactor inductance, capacitor inductance and line inductance sum;
The damping resistance R of conversing circuits is:
Described method of testing, is characterized in that, when the characterisitic parameter of active type conversing circuits is tested, described external DC charging power supply U is also parallel with monitoring voltage Table V.
Described oscillograph model is Tektronix DPO3012, and 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 the earth and to return or metal returns when changing between different running method, need to cut-off and the direct current transfer current of kilo-ampere, 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, therefore breaker fracture is difficult to blow-out cutout.In order to strengthen direct current blow-out cutout ability, a conversing circuits in parallel between AC circuit breaker fracture, to manufacture current zero-crossing point by AC circuit breaker energy breaking direct current.In order to ensure DC circuit breaker reliably breaking direct current, the characterisitic parameter such as frequency, damping resistance of conversing circuits must carry out field measurement, to guarantee that it meets design and use requirement, ensure that super, extra-high voltage direct-current transmission engineering current conversion station can run safely and reliably in different modes transfer process.
Extra-high pressure energy promotes the transport capacity of China's electrical network greatly.According to the data display that State Grid Corporation of China provides, primary Ioops extra-high voltage direct-current electrical network can send 6,000,000 kilowatts of electricity, is equivalent to 5 to 6 times of existing 500 Kilovolt Direct Current nets, and power transmission distance is also 2 to 3 times of the latter, and therefore efficiency improves greatly.In addition, according to State Grid Corporation of China's measuring and calculating, the electricity of same power is carried, if adopt extra high voltage line transmission of electricity can save the land resource of 60% than employing 500 kilovolts of supertension lines.Mention in country's " 12 " planning outline, adapt to the requirement of extensive transregional transmission of electricity and new energy power generation grid-connection, accelerate modern power network System Construction, further expansion transferring electricity from the west to the east scale, improve region mains network, Large Copacity, high-level efficiency, the remote advanced technology of transmission of electricitys such as development is super, extra-high voltage, the large province of water power that Sichuan is enriched as clean energy resource, following development all will depend on construction extra-high voltage grid, so the present invention is also in object that is super, UHV Transmission Engineering based on better services.
The method and device adopt the current sensor CT of Luo-coil, avoid the conversing circuits characterisitic parameter change problem that the access type testing current devices such as shunt can bring, the saturated defect of electromagnetic current transducer, Hall element temperature is floated, precision responding range is narrow and the shortcoming of moment needs calibration.The method and device by the present inventor's Successful utilization 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 ".
Accompanying drawing explanation
Fig. 1 is passive high voltage DC breaker conversing circuits circuit theory diagrams of the present invention (being conversing circuits in dotted line frame).
Fig. 2 is active type DC circuit breaker conversing circuits circuit theory diagrams of the present invention.
Fig. 3 is circuit (passive) schematic diagram of the external DC charging power supply of conversing circuits shown in Fig. 1.
Fig. 4 is the waveform figure of the actual test of the present invention ± 800kV Yue Loong current conversion station.
Embodiment
1) see Fig. 3, when tested breaker closing state, after safety ground is carried out to changeover condenser group C, untie the drainage thread terminal that tested isolating switch connects conversing circuits platform, after the drainage thread untied is passed Luo-coil CT, then recover and this terminal fastening.Namely isolating switch have passed through Luo-coil CT to the connecting line of conversing circuits platform.
Adopt the current sensor CT of Luo-coil, avoid the conversing circuits characterisitic parameter change problem that the access type testing current devices such as shunt can bring, the saturated defect of electromagnetic current transducer, Hall element temperature is floated, precision responding range is narrow and the shortcoming of moment needs calibration.
2) characterisitic parameter of passive conversing circuits is tested, see Fig. 3.
Adopt external DC charging power supply U, its positive and negative electrode is connected to changeover condenser group C two ends after charge switch SW1, prepares and charges to changeover condenser group C.When tested isolating switch CB "on" position, carry out external DC charging power supply U wiring, after wiring completes, operate tested breaker open operation.
Monitor charging voltage by the voltage table V of DC charging power supply U, respectively 200V, 400V, 500V, 600V, 800V and 1000V are charged to changeover condenser group C.Under the different charging voltage stationary value of changeover condenser group C, turn off charge switch SW1, makes DC charging power supply E depart from changeover condenser group C.
Respectively under the charging voltage that changeover condenser group C is different, operate tested isolating switch CB to close a floodgate, the i.e. dynamic and static contact closure of main fracture, changeover condenser group and conversing circuits inductance make conversing circuits generation self-sustained oscillation, gather self-sustained oscillation current waveform (see Fig. 4) by waveform acquisition equipment (as digital storage oscilloscope), thus obtain conversing circuits frequency f, conversing circuits inductance L, conversing circuits damping resistance R and conversing circuits electric current I.
Conversing circuits inductance is reactor inductance (having conversing circuits without reactor), capacitor inductance and line inductance sum.
3) characterisitic parameter of active type conversing circuits is tested, see Fig. 2.
For passive, it has charging device and single-pole switch S (see Fig. 2).During normal operation, single-pole switch S disconnects, and charging device E is to the charging of changeover condenser group, and during breaker open operation, after the dynamic and static contact of its main fracture separates 15ms-25ms, single-pole switch S closes, changeover condenser group and the self-sustained oscillation of conversing circuits inductance.
When the characterisitic parameter of conversing circuits is tested, charging device E is allowed to carry out the charging of different time to changeover condenser group C, after charging complete, single-pole switch S is manually made to close, make tested breaker closing again, namely the dynamic and static contact closure of its main fracture, gathers self-sustained oscillation current waveform by waveform acquisition equipment (as digital storage oscilloscope), thus obtains conversing circuits frequency f, conversing circuits inductance L, conversing circuits damping resistance R and conversing circuits electric current I.
When the characterisitic parameter of conversing circuits is tested, charging device subsidiary control loop, charging device E is allowed changeover condenser group to be carried out respectively to the charging of 1s, 5s, 10s, 30s, 60s equal time, after each charging complete, single-pole switch S is manually made to close respectively, tested breaker closing again, the dynamic and static contact closure of main fracture CB, gather self-sustained oscillation current waveform by waveform acquisition equipment (as digital storage oscilloscope), thus obtain conversing circuits frequency f, conversing circuits inductance L, conversing circuits damping resistance R and conversing circuits electric current I.
4) characterisitic parameter carrying out conversing circuits calculates.
No matter passive and active type conversing circuits, all directly can measure and obtain conversing circuits Capacitor banks capacitance C.
According to the conversing circuits electric current I waveform that the different charging voltage (passive) of changeover condenser group or different duration of charging (active type) collect, obtain frequency f and the damping time constant τ of conversing circuits respectively.Then finally obtain the conversing circuits characterisitic parameter determining scope.
Conversing circuits reactor inductance (having conversing circuits without reactor), changeover condenser inductance and line inductance sum are
The damping resistance of conversing circuits is
5) the characterisitic parameter measuring and calculation example of conversing circuits.
Through measuring conversing circuits changeover condenser group electric capacity C=60 μ F;
The time that can be obtained switching current five the concussion cycle by Fig. 4 is 984 μ s;
Therefore conversing circuits oscillation frequency f=5081Hz;
Damping time constant τ=0.684ms;
Conversing circuits vibration inductance by
calculate, 16 μ H;
The damping resistance of conversing circuits by
calculate, 46m Ω.
The major function of this device and technical indicator:
Major function: a kind of conversing circuits characterisitic parameter method of testing to super, extra-high voltage direct-current isolating switch passive and active type oscillation circuit is provided.Thus obtain conversing circuits frequency f, conversing circuits inductance L, conversing circuits damping resistance R and conversing circuits electric current I.
Super, extra-high voltage direct-current isolating switch conversing circuits 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%;
DC charging power supply temperature is floated: 0.05%/DEG C;
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 (being accessed by Fig. 3 breaker in middle SW1): model SCDC1000/10.
Claims (3)
1. super, an extra-high voltage direct-current isolating switch conversing circuits characterisitic parameter method of testing, comprise, high voltage DC breaker is composed as follows: in parallel with lightning arrester BL and form conversing circuits after 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 safety ground is carried out to changeover condenser group, untie the drainage thread terminal that high-voltage AC breaker connects described reactor H, after the drainage thread untied is passed Luo-coil CT, recover and this terminal fastening, then the signal output part of Luo-coil CT is connected to oscillograph;
2) as follows to the characterisitic parameter method of testing of passive conversing circuits:
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 after charge switch SW1, prepares and charges to changeover condenser group; When high-voltage AC breaker CB "on" position, carry out the wiring of external DC charging power supply U, after wiring completes, operate high pressure AC circuit breaker separating brake;
Monitor charging voltage by the voltage table V of DC charging power supply U, respectively 200V, 400V, 500V, 600V, 800V and 1000V are charged to changeover condenser group; Under the above-mentioned different charging voltage stationary values of changeover condenser group, turn off charge switch SW1, makes DC charging power supply U depart from changeover condenser group;
Respectively under the above-mentioned different charging voltage of changeover condenser group, operate high pressure AC circuit breaker closes a floodgate, make conversing circuits generation self-sustained oscillation, gather self-sustained oscillation current waveform by oscillograph, thus obtain conversing circuits frequency f, conversing circuits inductance L, conversing circuits damping resistance R and conversing circuits electric current I;
Conversing circuits inductance is reactor inductance, capacitor inductance and line inductance sum;
3) as follows to the characterisitic parameter method of testing of active type conversing circuits:
Charging device E is in parallel with changeover condenser group, and single-pole switch S is serially connected between changeover condenser group and reactor H;
When the characterisitic parameter of active type conversing circuits is tested, artificial disconnection single-pole switch S, charging device E is allowed changeover condenser group to be carried out respectively to the charging of 1s, 5s, 10s, 30s, 60s time, after each charging complete, single-pole switch S is manually made to close respectively, make high-voltage AC breaker close a floodgate again, gather self-sustained oscillation current waveform by oscillograph, thus obtain conversing circuits frequency
f, conversing circuits inductance
l, conversing circuits damping resistance
rand conversing circuits electric current
i;
4) characterisitic parameter carrying out conversing circuits calculates:
To above-mentioned passive and active type conversing circuits, directly measure the capacitance obtaining changeover condenser group
c;
According to the conversing circuits current waveform that the above-mentioned different charging voltage under passive condition of changeover condenser group or above-mentioned different duration of charging under active type condition collect, obtain conversing circuits frequency respectively
fand damping time constant
τ, then finally obtain the conversing circuits characterisitic parameter determining scope;
Conversing circuits inductance L is:
Conversing circuits inductance L is reactor inductance, capacitor inductance and line inductance sum;
The damping resistance R of conversing circuits is:
。
2. super, extra-high voltage direct-current isolating switch conversing circuits characterisitic parameter method of testing according to claim 1, it is characterized in that, when the characterisitic parameter of active type conversing circuits is tested, described external DC charging power supply U is also parallel with monitoring voltage Table V.
3. super, extra-high voltage direct-current isolating switch conversing circuits characterisitic parameter method of testing according to claim 2, it is characterized in that, described oscillograph model is Tektronix DPO3012, and Luo-coil model is CL-2000, and external DC charging power supply model is SCDC1000/10.
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| CN106054069A (en) * | 2016-07-21 | 2016-10-26 | 国网山西省电力公司电力科学研究院 | High-voltage DC circuit breaker auxiliary circuit oscillation parameter testing device and testing method |
| CN108519553B (en) * | 2018-03-30 | 2020-07-03 | 中国西电电气股份有限公司 | Method for calculating last current half-wave parameter of high-voltage alternating-current circuit breaker T100a breaking test |
| CN109658767B (en) * | 2018-12-24 | 2021-02-12 | 国家电网有限公司 | Circuit breaker operating mechanism performance detection device |
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