CN102680861B - System and method for testing short circuit withstanding capability of transformer or electric reactor - Google Patents
System and method for testing short circuit withstanding capability of transformer or electric reactor Download PDFInfo
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- CN102680861B CN102680861B CN201110061706.5A CN201110061706A CN102680861B CN 102680861 B CN102680861 B CN 102680861B CN 201110061706 A CN201110061706 A CN 201110061706A CN 102680861 B CN102680861 B CN 102680861B
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Abstract
The invention discloses a system for testing the short circuit withstanding capability of a transformer or an electric reactor, which comprises a power source, a capacitance compensating circuit formed from a compensating capacitor C and a transformer S to be tested or an electric reactor S to be tested, wherein the capacitance compensating circuit is connected with the transformer S to be tested or the electric reactor S to be tested in parallel. The invention also discloses a short circuit testing method. When the system and method for testing the short circuit withstanding capability of a transformer or an electric reactor are used for testing a large product, the testing capacity can be increased, and the system is convenient to operate.
Description
Technical field
The present invention relates to the field tests of transformer or reactor, particularly the short circuit withstand capability pilot system of a kind of transformer or reactor and method.
Background technology
Power transformer or reactor are one of equipment the most key in electric system, have very consequence in electric system.In electric system, power equipment is subject to the impact of various operating mode and fault, wherein short trouble is one of the most serious fault, therefore the extreme that the short-circuit strength of transformer or reactor is subject to power industry and manufacturing is paid close attention to, and relevant department is also for transformer or reactor product have worked out enforceable basic standard GB1094.5 bearing in the ability of short circuit.All transformers or reactor product must carry out correlation test according to above-mentioned standard before formally coming into operation.
Transformer or reactor various in style, as having substation transformer in transformer, power transformer, convertor transformer, tractive transformer and various special transformers etc.; Current-limiting reactor, current limiting reactor, neutral grounding reactor etc. are had in reactor, in various equipment standard, short-circuit test project name is also not quite similar, as short circuit withstand capability test, maximum short-time current test, short-circuit test etc., but regardless of which kind of product and for different tests project name, all have employed GB1094.5 basic standard, the test that therefore refer to this standard all belongs to short circuit withstand capability test.
Transformer or the test of reactor short circuit withstand capability are the working conditions of simulation product when Power System Shortcuts, should by the capacity of short circuit of system.Transformer or reactor short circuit withstand capability test main difficulty are that testing equipment or system need to provide very large capacity of experiment.There is provided the mode of capacity of experiment to have three kinds at present, namely electric system provides, surge generator provides with system and generator combinedly to provide.Three kinds of modes all have employing in the world at present, and China mainly have employed first two mode.
By contrast, electric system directly provides both economical, but its test capability is subject to the restriction of net capacity and ruuning situation, cannot carry out jumbo short circuit withstand capability test.Separate unit or multiple stage surge generator can provide larger capacity, but investment is large, run complicated.And although electrical network and generator combined operation can provide larger capacity of experiment, invest huge, and run very complicated, its stability is difficult to ensure.
Summary of the invention
The object of the invention is to set up a kind of capacitance compensation for the short circuit withstand capability pilot system of transformer and reactor and method, increase the capacity of experiment of the short circuit withstand capability pilot system of transformer or reactor, reduce the short circuit withstand capability pilot system of transformer or reactor and gaining merit and reactive power of generator.
According to an aspect of the present invention, the short circuit withstand capability pilot system of a kind of transformer or reactor is provided to comprise power supply, the capacitor compensating circuit be made up of compensation condenser C, transformer S to be measured or reactor S to be measured; Described capacitor compensating circuit is in parallel with described transformer S to be measured or reactor S to be measured.
According to another aspect of the present invention, a kind of short-circuit test method for transformer or reactor is provided to comprise: between power supply and transformer S to be measured or reactor S to be measured, access described capacitor compensating circuit, to improve the capacity of experiment of the short-circuit test system of transformer and reactor.
According to another aspect of the present invention, a kind of short-circuit test method for transformer and reactor is provided to comprise: between described intermediate transformer T and transformer S to be measured or reactor S to be measured, access described capacitor compensating circuit, to improve the capacity of experiment of the short-circuit test system of transformer and reactor; Or
Described capacitor compensating circuit is accessed, to improve the capacity of experiment of the short-circuit test system of transformer and reactor between power supply and described intermediate transformer T.
According to the transformer of application capacitor compensating circuit provided by the invention or the short circuit withstand capability pilot system of reactor, large product is tested, capacity of experiment can be improved, it is convenient to run, only under the existing method of operation, in pilot system, access capacitor compensating circuit, do not need to overlap control system more, do not want the parallel Operation Control of system and generator yet; Meritorious and the reactive power of minimizing system and generator, provides idle by capacitor compensating circuit.Also the noise jamming of generator can be avoided without generator.
The beneficial effect of technical scheme provided by the invention mainly comprise following some:
1, adopt short circuit withstand capability pilot system of the present invention to carry out short circuit withstand capability test and greatly can reduce testing equipment investment.Large product is tested, if capacity of experiment is not enough under existence conditions, then generator will be increased, by the guestimate of a certain system power supply situation, adopt short circuit withstand capability pilot system of the present invention to create the test condition of same capacity, its cost of investment is only about to adopt increases about 10% of generator expanding test capacity.Therefore the present invention has great economic worth;
2, short circuit withstand capability pilot system of the present invention is run conveniently.Pilot system of the present invention can based on existing pilot system, and only under the existing method of operation, need access capacitor compensating circuit in pilot system can realize, and does not need to overlap control system more, does not also need the parallel Operation Control of system and generator;
3, short circuit withstand capability pilot system of the present invention energy-conserving and environment-protective.Adopt short circuit withstand capability pilot system of the present invention can reach larger capacity of experiment, can reduce the meritorious and reactive power of system and generator than existing additive method, the present invention can provide idle by capacitor compensating circuit.Meanwhile, noise jamming and the energy resource consumption of generator also can be avoided without generator.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the capacitance compensation that the embodiment of the present invention provides;
Fig. 2 is that employing that the embodiment of the present invention provides is single-phase or two-phase power supply is powered, with intermediate transformer and capacitor compensating circuit is connected in parallel on the circuit structure diagram of the short circuit withstand capability pilot system between transformer S to be measured (or reactor S to be measured) and intermediate transformer T;
Fig. 3 is that the employing three-phase supply that the embodiment of the present invention provides is powered, with intermediate transformer and capacitor compensating circuit is connected in parallel on the circuit structure diagram of the short circuit withstand capability pilot system between described transformer S to be measured (or reactor S to be measured) and intermediate transformer T;
Fig. 4 is the Equivalent Circuit schematic diagram of circuit structure shown in Fig. 2.
Embodiment
The short circuit withstand capability pilot system of transformer of the present invention or reactor mainly make use of capacitance compensation principle, adopts capacitance compensation method, and compensation condenser is in parallel with inductive load, with capacitance current compensating inductance electric current.
As shown in Figure 1, the schematic diagram of capacitance compensation of the present invention, the parallel impedance in this loop
with L
2change with the change of C, can be positive and negative or infinitely great, be inductive load or capacitive load.In short-circuit strength test, get denominator (1-ω
2l
2c) be that between 1 ~ 0, Z is at ω L on the occasion of (being perception)
2and between infinity, if Z becomes large, then power supply capacity reduces,
time do not need power supply capacity.
This tank capacitance current i
3more front voltage (u) 90 °, inductive current i
2lag behind (u) 90 °, i.e. resultant current i
1for i
2, i
3subtract each other, i
1be less than i
2, i.e. warranty test current i
2lower minimizing source current i
1, reduce the capacity absorbed from power supply.
Under short circuit withstand capability test situation, building-out capacitor electric current and test product electric current and source current also have similarity relation, but complexity many.At present, all do not apply capacitance compensation method both at home and abroad and carry out short circuit withstand capability test, the practical application of this method all will solve a lot of crucial technical matters with implementing in theory.
The capacitor compensating circuit that the short circuit withstand capability pilot system being applied to transformer or reactor provided by the invention mainly comprises power supply, transformer S to be measured (or reactor S to be measured) and forms primarily of compensation condenser C.Capacitor compensating circuit is in parallel with transformer S to be measured (or reactor S to be measured).
The main devices of capacitor compensating circuit is building-out capacitor C.In order to waveform can be adjusted better, can to connect waveform adjusting resistance at capacitor compensating circuit.
In order to measure the current conditions of capacitor compensating circuit, the 3rd Current Transmit can be set on capacitor compensating circuit
3.At the 3rd Current Transmit
3and the second disconnector K can be set between building-out capacitor C
2.
In order to protect building-out capacitor C not damaged by the abnormal superpotential produced in process of the test, capacitor compensating circuit also can comprise by protective resistance R
5and protect ball gap or gap P
2discharge protection circuit in series.
Electric power output voltage possibly cannot directly meet needed for test, as with system power supply, the transformer S to be measured (or reactor S to be measured) of same electrical voltage system or the transformer S to be measured (or reactor S to be measured) of low voltage system can only be tested, now can add intermediate transformer T to adjust voltage, or utilize larger reactor L to adjust voltage without intermediate transformer T.When with lower electrical voltage system or generator as power supply, and transformer S to be measured (or reactor S to be measured) voltage higher time, then carry out boosted voltage with intermediate transformer T, to meet the testing requirements of the transformer S to be measured (or reactor S to be measured) of high voltage.
When not using intermediate transformer T, capacitor compensating circuit is connected to the input end of transformer S to be measured (or reactor S to be measured); When using intermediate transformer T, capacitor compensating circuit is connected to the input end (between intermediate transformer T and transformer to be measured (or reactor to be measured) S) of transformer S to be measured (or reactor S to be measured), or the input end of intermediate transformer T (between power supply and intermediate transformer T), according to the power supply number of phases, the different situations of capacitance compensation access point with or without intermediate transformer T and when having intermediate transformer T, there is different pilot systems respectively:
1. adopt single-phase or two-phase power supply is powered, with intermediate transformer and capacitor compensating circuit is connected in parallel on the short circuit withstand capability pilot system of transformer between described transformer S to be measured (or reactor S to be measured) and intermediate transformer T and reactor.
2. adopt single-phase or two-phase power supply is powered, with intermediate transformer and capacitor compensating circuit is connected in parallel on the short circuit withstand capability pilot system of transformer between power supply and intermediate transformer T and reactor.
3. adopt single-phase or two-phase power supply to power, there is no intermediate transformer and the short circuit withstand capability pilot system of the capacitor compensating circuit transformer in parallel with transformer S to be measured (or reactor S to be measured) and reactor.
4. adopt three-phase supply to power, with intermediate transformer and capacitor compensating circuit is connected in parallel on the short circuit withstand capability pilot system of transformer between transformer S to be measured (or reactor S to be measured) and intermediate transformer T and reactor.
5. adopt three-phase supply to power, with intermediate transformer and capacitor compensating circuit is connected in parallel on the short circuit withstand capability pilot system of transformer between power supply and intermediate transformer T and reactor.
6. adopt three-phase supply to power, there is no intermediate transformer and the short circuit withstand capability pilot system of the capacitor compensating circuit transformer in parallel with described transformer S to be measured (or reactor S to be measured) and reactor.
Fig. 2 adopts single-phase or two-phase power supply is powered, with intermediate transformer and capacitor compensating circuit is connected in parallel on the short circuit withstand capability test circuit figure of transformer between described transformer S to be measured (or reactor S to be measured) and intermediate transformer T and reactor.In order to electric current and the voltage of each branch road of control and measurement native system, can the 3rd disconnector K be set between power supply and intermediate transformer T
5, the 3rd Current Transmit
4, the 3rd isolating switch K
6, voltage transformer pt
3, the 4th isolating switch K
7.First disconnector K is set between intermediate transformer T and capacitor compensating circuit
1, the first voltage transformer pt
1, the first isolating switch K
3, the second isolating switch K
4, the first Current Transmit
1, between capacitor compensating circuit and transformer S to be measured (or reactor S to be measured), the second Current Transmit is set
2, lightning arrester P1, voltage transformer pt
2, capacitor compensating circuit arranges the 3rd Current Transmit
3with disconnector K
2, in order to regulate test current, linked reactor L between power supply and transformer S to be measured (or reactor S to be measured).
When adopt single-phase or two-phase power supply is powered, with intermediate transformer and capacitor compensating circuit is connected in parallel between power supply and intermediate transformer T time, between power supply and intermediate transformer T, access the 3rd disconnector K
5, the 3rd Current Transmit
4, the 3rd isolating switch K
6, voltage transformer pt
3, the 4th isolating switch K
7and capacitor compensating circuit.Between transformer S to be measured (or reactor S to be measured) and intermediate transformer T, the first disconnector K is set
1, the first isolating switch K
3, the second isolating switch K
4, the first Current Transmit
1, lightning arrester P1.
Power when adopting single-phase or two-phase power supply, there is no intermediate transformer and capacitor compensating circuit is in parallel with described transformer S to be measured (or reactor S to be measured) time, access the 3rd disconnector K between power supply and capacitor compensating circuit
5, the first voltage transformer pt
1, the first isolating switch K
3, the second isolating switch K
4, the first Current Transmit
1, between capacitor compensating circuit and transformer S to be measured (or reactor S to be measured), the second Current Transmit is set
2, lightning arrester P1, voltage transformer pt
2, capacitor compensating circuit arranges the 3rd Current Transmit
3with disconnector K
2, in order to regulate test current, linked reactor L between power supply and transformer S to be measured (or reactor S to be measured).
Fig. 3 is for adopting three-phase supply to power, with intermediate transformer and capacitor compensating circuit is connected in parallel on test circuit figure between described transformer S to be measured (or reactor S to be measured) and intermediate transformer T, every phase equipment is identical with the equipment that single-phase or two-phase power supply are powered, and namely between power supply and intermediate transformer T, arranges the 3rd disconnector K
5, the 3rd Current Transmit
4, the 3rd isolating switch K
6, voltage transformer pt
3, the 4th isolating switch K
7.First disconnector K is set between intermediate transformer T and capacitor compensating circuit
1, the first voltage transformer pt
1, the first isolating switch K
3, the second isolating switch K
4, the first Current Transmit
1, between capacitor compensating circuit and transformer S to be measured (or reactor S to be measured), the second Current Transmit is set
2, lightning arrester P1, voltage transformer pt
2, capacitor compensating circuit arranges the 3rd Current Transmit
3with disconnector K
2, in order to regulate test current, linked reactor L between power supply and transformer S to be measured (or reactor S to be measured).During three-phase test, building-out capacitor can to connect or D connects by Y.
Three-phase supply is adopted to power, also can capacitor compensating circuit is connected in parallel between power supply and intermediate transformer T with the transformer of intermediate transformer and the short circuit withstand capability pilot system of reactor, three-phase supply is by intermediate transformer T to three-phase transformer to be measured S (or reactor S to be measured) power supply, and every phase equipment arranges identical with the equipment of the Power supply of single-phase or two-phase.
Adopt three-phase supply power, the do not have capacitor compensating circuit of the transformer of intermediate transformer and the short circuit withstand capability pilot system of reactor in parallel with described transformer S to be measured (or reactor S to be measured), three-phase supply is directly to three-phase transformer to be measured S (or reactor S to be measured) power supply, and every phase equipment arranges identical with the equipment of the Power supply of single-phase or two-phase.
There is intermediate transformer T in the embodiment of the present invention, and when capacitor compensating circuit can be connected in parallel between transformer S to be measured (or reactor S to be measured) and intermediate transformer T, its test procedure is as follows:
Step S1, before on-test, first should give intermediate transformer T power transmission, its order is: K
5close a floodgate, K
6close a floodgate, K
7close a floodgate.(K
5must at K
6, K
7first close a floodgate before entirely closing, because K
5can not belt current on/off switch);
Step S2, adjustment reactor, capacitor, resistance value, meet less than 70% electric current and be used for debug lines;
Step S3, K
2combined floodgate, K
1close a floodgate;
Step S4, K
3close a floodgate, K
4close a floodgate, K
3separating brake, K
4separating brake, completes less than 70% electric current debug lines;
Step S5, K
1separating brake, K
2separating brake;
Step S6, adjustment reactor, capacitor, resistance value, meet 100% current testing;
Step S7, K
2combined floodgate, K
1close a floodgate;
Step S8, K
3close a floodgate, K
4close a floodgate, K
3separating brake, K
4separating brake, completes 100% current testing;
Step S9, K
1separating brake, K
2separating brake;
Step S10, measure the reactance value waiting to try transformer S (or waiting to try reactor S);
Repeated execution of steps S7 ~ S10 twice;
Step S11, tested transformer commutation, change tap, and adjust reactor numerical value, meet 100% current testing;
Repeated execution of steps S7 ~ S10 tri-times;
Step S12, tested transformer commutation, change tap, and adjust reactor numerical value, meet 100% current testing;
Repeated execution of steps S7 ~ S10 tri-times.
Each test only just understands generation current in circuit and tested transformer when step S4, S8, and the moment of generation current is K
3, K
4the moment of simultaneously closing a floodgate, electric current flows through each equipment in circuit successively, capacitance compensation branch road and CT
2to the branch circuit parallel connection of tested transformer S, the size of current pass flowing through each equipment is: CT
1the electric current of branch road is i
1, capacitance compensation branch current is i
3, the branch current of tested transformer S is i
2, then i
2=i
1+ i
3.After off-test, should disconnect intermediate transformer power supply, its order is: K
7separating brake, K
6separating brake, K
5separating brake.(K
5must at K
6, K
7have one first separately after could separating brake because K
5can not belt current on/off switch).
Below in conjunction with Fig. 4, the Equivalent Circuit of the short circuit withstand capability pilot system of transformer shown in Fig. 2 and Fig. 3 or reactor is described choosing of building-out capacitor.Choosing of building-out capacitor is the symmetry value of warranty test electric current.Wherein, power supply U can be that system, generator or system and generator combined operation provide, and wherein only power branch is different.Compensation principle and calculating are roughly the same.Z
sfor the internal resistance of source resists, Z
itfor intermediate transformer impedance, Z
lfor external series impedance, Z
tfor test product impedance, C is building-out capacitor.External series impedance Z
lfor testing equipment and test product parameter one timing Adjustment Tests current value, it will ensure also to ensure the energy that the absorption energy in loop is no more than power supply and allows to provide to be less than other safety currents by the electric current of intermediate transformer in addition.Test product impedance Z
tbe inversely proportional to product capacity, when not compensating
(C=0), special test system has a Z
tultimate value Z
t1if, Z
tbe less than the rating test electric current that this value (namely larger test product capacity) then can not produce test product.The effect of building-out capacitor C is at Z
tbe less than Z
t1time, make Z
twith C parallel impedance Z
t2increase, Z
t2>=Z
t1improve test product voltage U
1and test current value.
Test product inductance L
2time in parallel with C, parallel impedance:
When uncompensated test transform capacity is W to the maximum
1time (impedance Z
t1), if larger transformer capacity W
2(impedance Z
t) need test, then improve loaded impedance with electric capacity C, with electric capacity be:
wherein, described W
1represent the maximum capacity of experiment that pilot system can provide in without capacitance compensation situation; Described W
2represent pilot system and the capacity of experiment that can provide in capacitance compensation situation is being provided; Described Z
t1the short-circuit impedance value of the transformer S to be measured (or reactor S to be measured) corresponding to W1 capacity of experiment; Described ω is power frequency angular frequency.
The short circuit withstand capability pilot system of the transformer provided according to the embodiment of the present invention or reactor is tested large product, capacity of experiment can be improved, it is convenient to run, only under the existing method of operation, in pilot system, access capacitor compensating circuit, do not need to overlap control system more, do not want the parallel Operation Control of system and generator yet; Meritorious and the reactive power of minimizing system and generator, provides idle by capacitor compensating circuit.Also the noise jamming of generator can be avoided without generator.
Above-described embodiment is the present invention's preferably embodiment; but embodiments of the present invention are not restricted to the described embodiments; change, the modification done under other any does not deviate from Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (14)
1. a short circuit withstand capability pilot system for transformer or reactor, is characterized in that, comprising:
Power supply, the capacitor compensating circuit be made up of compensation condenser C, transformer S to be measured or reactor S to be measured; Described capacitor compensating circuit is in parallel with described transformer S to be measured or reactor S to be measured; Described capacitor compensating circuit also comprises:
Waveform adjusting resistance, reactor L, the first disconnector K
1, the first voltage transformer pt
1, the first isolating switch K
3, the second isolating switch K
4, the first Current Transmit
1, the second Current Transmit
2, lightning arrester P1 and the second voltage transformer pt
2;
Described waveform adjusting resistance is connected with described compensation condenser C; When described power supply be single-phase or two-phase time, a phase of described power supply exports on branch road: an output terminal of power supply is by described first voltage transformer pt
1, the first isolating switch K
3, the second isolating switch K
4, the first disconnector K
1, reactor L, the first Current Transmit
1respectively with described capacitor compensating circuit and described CT
2connect; Described CT
2one end is by described lightning arrester P1, voltage transformer pt
2be connected with described transformer S to be measured or reactor S to be measured, the other end respectively with described first Current Transmit
1and described capacitor compensating circuit connects;
When described power supply is three phase times, export mutually on branch road the every of power supply: the every of described power supply exports mutually by the first voltage transformer pt
1, the first isolating switch K
3, the second isolating switch K
4, the first disconnector K
1, reactor L, the first Current Transmit
1respectively with described capacitor compensating circuit and described CT
2connect; Described CT
2one end is by described lightning arrester P1, voltage transformer pt
2be connected with described transformer S to be measured or reactor S to be measured, the other end respectively with described first Current Transmit
1and described capacitor compensating circuit connects.
2. short circuit withstand capability pilot system according to claim 1, is characterized in that, described waveform adjusting resistance comprises:
First waveform adjusting resistance R
3with the second waveform adjusting resistance R
4;
Described first waveform adjusting resistance R
3by the second waveform adjusting resistance R
4be connected with described compensation condenser C.
3. short circuit withstand capability pilot system according to claim 2, is characterized in that, described capacitor compensating circuit also comprises:
3rd Current Transmit
3and the second disconnector K
2; Described 3rd Current Transmit
3successively by described second disconnector K
2, described first waveform adjusting resistance R
3, described second waveform adjusting resistance R
4connect with described compensation condenser C.
4. short circuit withstand capability pilot system according to claim 3, is characterized in that, described capacitor compensating circuit also comprises:
By protective resistance R
5with protection ball gap or gap P
2discharge protection circuit in series; Described discharge protection circuit and described second waveform adjusting resistance R
4and the branch circuit parallel connection that building-out capacitor C is formed, with described first waveform adjusting resistance R
3connect.
5. the short circuit withstand capability pilot system according to any one of Claims 1-4, is characterized in that, also comprise:
Intermediate transformer T, for adjusting supply voltage; Described intermediate transformer T is connected between described power supply and described transformer S to be measured or reactor S to be measured.
6. short circuit withstand capability pilot system according to claim 5, is characterized in that, also comprise:
3rd disconnector K
5, the 3rd Current Transmit
4, the 3rd isolating switch K
6, voltage transformer pt
3, the 4th isolating switch K
7;
When power supply is single-phase, two-phase or three phase times, described power supply every mutually by the 3rd disconnector K of series connection
5, the 3rd Current Transmit
4, the 3rd isolating switch K
6, voltage transformer pt
3and the 4th isolating switch K
7be connected with described intermediate transformer T.
7. short circuit withstand capability pilot system according to claim 6, is characterized in that, also comprise:
Reactor L, the first disconnector K
1, the first voltage transformer pt
1, the first isolating switch K
3, the second isolating switch K
4, the first Current Transmit
1, the second Current Transmit
2, lightning arrester P1 and the second voltage transformer pt
2;
When described power supply be single-phase or two-phase time, a phase of described intermediate transformer T exports on branch road: a phase output terminal of described intermediate transformer T is by described first voltage transformer pt
1, the first isolating switch K
3, the second isolating switch K
4, the first disconnector K
1, reactor L, the first Current Transmit
1respectively with described capacitor compensating circuit and described CT
2connect; Described CT
2one end is by described lightning arrester P1, voltage transformer pt
2be connected with described transformer S to be measured or reactor S to be measured, the other end respectively with described first Current Transmit
1and described capacitor compensating circuit connects;
When described power supply is three phase times, export mutually on branch road the every of intermediate transformer T: the every of described intermediate transformer T exports mutually by the first voltage transformer pt
1, the first isolating switch K
3, the second isolating switch K
4, the first disconnector K
1, reactor L, the first Current Transmit
1respectively with described capacitor compensating circuit and described CT
2connect; Described CT
2one end is by described lightning arrester P1, voltage transformer pt
2be connected with described transformer S to be measured or reactor S to be measured, the other end respectively with described first Current Transmit
1and described capacitor compensating circuit connects.
8. short circuit withstand capability pilot system according to claim 5, is characterized in that, also comprise:
3rd disconnector K
5, the 3rd Current Transmit
4, the 3rd isolating switch K
6, voltage transformer pt
3, the 4th isolating switch K
7;
When power supply is single-phase, two-phase or three phase times, described power supply every mutually by the 3rd disconnector K of series connection
5, the 3rd Current Transmit
4, the 3rd isolating switch K
6, voltage transformer pt
3, the 4th isolating switch K
7be connected with described intermediate transformer T and described capacitor compensating circuit respectively.
9. short circuit withstand capability pilot system according to claim 8, is characterized in that, also comprise:
When described power supply be single-phase or two-phase time, export on branch road in a phase of described intermediate transformer T: an output terminal of intermediate transformer T is by the first voltage transformer pt
1, the first isolating switch K
3, the second isolating switch K
4, the first disconnector K
1, reactor L, the first Current Transmit
1, the second Current Transmit
2, lightning arrester P1 and the second voltage transformer pt
2be connected with described transformer S to be measured or described reactor S to be measured;
When described power supply is three phase times, export mutually on branch road the every of described intermediate transformer T: every phase output terminal of described intermediate transformer T is by the first voltage transformer pt
1, the first isolating switch K
3, the second isolating switch K
4, the first disconnector K
1, reactor L, the first Current Transmit
1, the second Current Transmit
2, lightning arrester P1 and the second voltage transformer pt
2be connected with described transformer S to be measured or reactor S to be measured.
10. the short circuit withstand capability pilot system according to any one of Claims 1-4, is characterized in that:
When capacitor compensating circuit is connected in parallel between described transformer S to be measured or reactor S to be measured and intermediate transformer T, or when capacitor compensating circuit is connected in parallel between power supply and intermediate transformer, the minimum guarantee value of described building-out capacitor is determined according to following formula:
Wherein,
Described W
1represent the maximum capacity of experiment that pilot system can provide in without capacitance compensation situation;
Described W
2represent pilot system and the capacity of experiment that can provide in capacitance compensation situation is being provided;
Described Z
t1transformer S to be measured corresponding to W1 capacity of experiment or the short-circuit impedance value of reactor S to be measured;
Described ω is power frequency angular frequency.
System described in any one of Claims 1-4 is used for the short-circuit test method of transformer or reactor, it is characterized in that, comprise by 11. 1 kinds:
Described capacitor compensating circuit is accessed, to improve the capacity of experiment of the short-circuit test system of transformer and reactor between power supply and transformer S to be measured or reactor S to be measured.
12. methods according to claim 11, is characterized in that, the minimum guarantee value of described building-out capacitor is determined according to following formula:
Wherein,
Described W
1represent the maximum capacity of experiment that pilot system can provide in without capacitance compensation situation;
Described W
2represent pilot system and the capacity of experiment that can provide in capacitance compensation situation is being provided;
Described Z
t1transformer S to be measured corresponding to W1 capacity of experiment or the short-circuit impedance value of reactor S to be measured;
Described ω is power frequency angular frequency.
System described in any one of claims 1 to 3 is used for the short-circuit test method of transformer and reactor, it is characterized in that by 13. 1 kinds: this system also comprises intermediate transformer T; Described intermediate transformer T is connected between described power supply and transformer S to be measured or reactor S to be measured;
Described capacitor compensating circuit is accessed, to improve the capacity of experiment of the short-circuit test system of transformer and reactor between described intermediate transformer T and transformer S to be measured or reactor S to be measured; Or
Described capacitor compensating circuit is accessed, to improve the capacity of experiment of the short-circuit test system of transformer and reactor between power supply and described intermediate transformer T.
14. methods according to claim 14, is characterized in that, the minimum guarantee value of described building-out capacitor is determined according to following formula:
Wherein,
Described W
1represent the maximum capacity of experiment that pilot system can provide in without capacitance compensation situation;
Described W
2represent pilot system and the capacity of experiment that can provide in capacitance compensation situation is being provided;
Described Z
t1transformer S to be measured corresponding to W1 capacity of experiment or the short-circuit impedance value of reactor S to be measured;
Described ω is power frequency angular frequency.
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| CN103529352B (en) * | 2013-10-29 | 2015-09-30 | 国家电网公司 | The on-line monitoring system of short-circuit force suffered by fortune transformer can be monitored |
| RU2566395C1 (en) * | 2014-09-04 | 2015-10-27 | Открытое акционерное общество "Научно-технический центр Федеральной сетевой компании Единой энергетической системы" | Device for testing high-voltage equipment to short-circuit current resistivity |
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| CN114252809A (en) * | 2021-12-29 | 2022-03-29 | 苏州电器科学研究院股份有限公司 | Power supply capacity calculation method and device of extra-high voltage transformer test system |
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Address after: 110122 No. 20-1, Hushitai South Street, shenbeixin District, Shenyang City, Liaoning Province (all) Patentee after: Shenyang Transformer Research Institute Co.,Ltd. Address before: Hunnan New Century Road 110179 Shenyang city of Liaoning Province, No. 39 Patentee before: SHENYANG TRANSFORMER RESEARCH INSTITUTE Co.,Ltd. |