CN102680861A - 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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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 invention relates to the field of testing of transformers or reactors, in particular to a system and a method for testing short circuit bearing capacity of a transformer or a reactor.
Background
Power transformers or reactors are one of the most critical devices in power systems, where they are of great importance. In an electric power system, electric power equipment is affected by various working conditions and faults, wherein a short-circuit fault is one of the most serious faults, so that the short-circuit strength of a transformer or a reactor is extremely concerned by the electric power industry and the manufacturing industry, and a mandatory basic standard GB1094.5 is also made for the transformer or the reactor product in terms of the capacity of bearing the short-circuit. All transformer or reactor products must be subjected to relevant tests according to the above standards before being put into use formally.
The variety of the transformer or the reactor is various, such as a distribution transformer, a power transformer, a converter transformer, a traction transformer, various special transformers and the like; the reactor is provided with a series reactor, a current limiting reactor, a neutral point grounding reactor and the like, the names of short-circuit test projects in various equipment standards are different, such as a short-circuit bearing capacity test, a maximum short-time current test, a short-circuit test and the like, but no matter what product and different test project names, the GB1094.5 basic standard is adopted, so the test introduced with the standard belongs to the short-circuit bearing capacity test.
The short-circuit bearing capacity test of the transformer or the reactor is to simulate the working condition of a product when a power system is in short circuit and to pass the short-circuit capacity of the system. The main difficulty in testing the short-circuit endurance of a transformer or a reactor is that the test equipment or system needs to provide a large test capacity. There are three ways to provide the test capacity at present, namely power system provision, impulse generator provision and system and generator combination provision. At present, three modes are adopted in the world, and the first two modes are mainly adopted in China.
In contrast, the power system is directly economical, but the test capability is limited by the capacity and the operation condition of the power grid, and the large-capacity short circuit bearing capability test cannot be carried out. The single or multiple impact generators can provide larger capacity, but the investment is large and the operation is complex. The combined operation of the power grid and the generator can provide larger test capacity, but the investment is huge, the operation is complex, and the stability is difficult to guarantee.
Disclosure of Invention
The invention aims to establish a system and a method for testing the short-circuit bearing capacity of a transformer and a reactor by capacitance compensation, which are used for increasing the test capacity of the short-circuit bearing capacity test system of the transformer or the reactor and reducing the active and reactive powers of the short-circuit bearing capacity test system of the transformer or the reactor and a generator.
According to one aspect of the invention, a short circuit bearing capacity test system of a transformer or a reactor is provided, which comprises a power supply, a capacitance compensation circuit formed by a compensation capacitor C, a transformer S to be tested or a reactor S to be tested; the capacitance compensation circuit is connected with the transformer S to be tested or the reactor S to be tested in parallel.
According to another aspect of the present invention, there is provided a short circuit test method for a transformer or a reactor, including: and the capacitance compensation circuit is connected between the power supply and the transformer S to be tested or the reactor S to be tested so as to improve the test capacity of the short-circuit test system of the transformer and the reactor.
According to another aspect of the present invention, there is provided a short circuit test method for a transformer and a reactor, including: the capacitance compensation circuit is connected between the intermediate transformer T and the transformer S to be tested or the reactor S to be tested so as to improve the test capacity of the short-circuit test system of the transformer and the reactor; or
And the capacitance compensation circuit is connected between the power supply and the intermediate transformer T so as to improve the test capacity of the short-circuit test system of the transformer and the reactor.
According to the short circuit bearing capacity test system of the transformer or the reactor applying the capacitance compensation circuit, provided by the invention, the test capacity can be improved for large-scale products, the operation is convenient, the capacitance compensation circuit is connected into the test system only in the existing operation mode, a plurality of sets of control systems are not needed, and the parallel operation control of the system and the generator is also not needed; active power and reactive power of the system and the generator are reduced, and reactive power is provided by the capacitance compensation circuit. Noise interference of the generator can be avoided without the generator.
The technical scheme provided by the invention has the following beneficial effects:
1. the short circuit bearing capacity test system can greatly reduce the investment of test equipment when used for carrying out the short circuit bearing capacity test. For large-scale product tests, if the test capacity is insufficient under the existing conditions, a generator needs to be added, the test conditions with the same capacity are created by adopting the short circuit bearing capacity test system according to rough estimation of the power supply condition of a certain system, and the investment cost is only about 10 percent of the test capacity enlarged by adopting the increased generator. Therefore, the invention has great economic value;
2. the short circuit bearing capacity test system is convenient to operate. The test system can be realized by only connecting a capacitance compensation circuit in the test system in the existing operation mode on the basis of the existing test system, and does not need a plurality of sets of control systems or the parallel operation control of the system and a generator;
3. the short circuit bearing capacity test system is energy-saving and environment-friendly. The short circuit bearing capacity test system can achieve larger test capacity, and can reduce active power and reactive power of the system and a generator compared with other methods in the prior art. Meanwhile, noise interference and energy consumption of the generator can be avoided without the generator.
Drawings
FIG. 1 is a schematic diagram of capacitance compensation provided by an embodiment of the present invention;
fig. 2 is a circuit structure diagram of a short circuit endurance test system which is powered by a single-phase or two-phase power supply and has an intermediate transformer and a capacitance compensation circuit connected in parallel between a transformer S to be tested (or a reactor S to be tested) and the intermediate transformer T according to an embodiment of the present invention;
fig. 3 is a circuit structure diagram of a short circuit endurance test system which is powered by a three-phase power supply and has an intermediate transformer and a capacitance compensation circuit connected in parallel between the transformer S to be tested (or a reactor S to be tested) and the intermediate transformer T according to an embodiment of the present invention;
fig. 4 is an equivalent circuit diagram of the circuit configuration shown in fig. 2.
Detailed Description
The short circuit bearing capacity test system of the transformer or the reactor mainly utilizes a capacitance compensation principle, adopts a capacitance compensation method, connects a compensation capacitor and an inductive load in parallel, and compensates inductive current by using capacitive current.
As shown in FIG. 1, the schematic diagram of the capacitance compensation of the present invention, the parallel impedance of the loop
With L2And C, which can be positive or negative or infinite, i.e., an inductive load or a capacitive load. In the short circuit strength test, the denominator (1-omega) is taken2L2C) Positive (i.e. inductive) value, between 1 and 0, Z is at ω L2And between infinity, as Z increases, the power supply capacity decreases
No power supply capacity is required.
The loop capacitance current i3The more anteriorVoltage (u)90 DEG, inductive current i2Behind (u) by 90 °, i.e. the resultant current i1Is i2、i3Are subtracted, i1Is less than i2I.e. to ensure the test current i2Lower reduction of supply current i1Reducing the capacity absorbed from the power source.
In the case of short circuit endurance test, the compensation capacitor current has a similar relationship with the sample current and the power supply current, but is much more complicated. At present, a capacitance compensation method is not applied to a short circuit bearing capacity test at home and abroad, and the practical application of the method needs to solve a plurality of key technical problems in theory and implementation.
The short circuit bearing capacity test system applied to the transformer or the reactor mainly comprises a power supply, a transformer S to be tested (or a reactor S to be tested) and a capacitance compensation circuit mainly composed of a compensation capacitor C. The capacitance compensation circuit is connected in parallel with the transformer S (or the reactor S) to be tested.
The main component of the capacitance compensation circuit is a compensation capacitor C. In order to adjust the waveform better, a waveform adjusting resistor may be connected in series to the capacitance compensation circuit.
In order to measure the current condition of the capacitance compensation circuit, a third current transformer CT may be arranged on the capacitance compensation circuit3. At the third current transformer CT3A second isolating switch K can be arranged between the compensating capacitor C and the compensating capacitor C2。
In order to protect the compensation capacitor C from abnormal over-voltage generated during the test, the capacitor compensation circuit may further include a protection resistor R5And protecting the ball gap or clearance P2And a discharge protection circuit formed in series.
The output voltage of the power supply may not directly meet the requirement of the test, for example, if the system is used for supplying power, only the transformer S (or the reactor S to be tested) to be tested of the same voltage system or the transformer S (or the reactor S to be tested) to be tested of a lower voltage system can be tested, and at this time, the intermediate transformer T can be added to adjust the voltage, or the larger reactor L can be used to adjust the voltage without the intermediate transformer T. When a lower voltage system or a generator is used as a power supply and the voltage of the transformer S to be tested (or the reactor S to be tested) is higher, the voltage is increased by using the intermediate transformer T so as to meet the test requirement of the transformer S to be tested (or the reactor S to be tested) with higher voltage.
When the intermediate transformer T is not used, the capacitance compensation circuit is connected to the input end of the transformer S to be tested (or the reactor S to be tested); when the intermediate transformer T is used, the capacitance compensation circuit is connected with the input end of the transformer S to be tested (or the reactor S to be tested) (between the intermediate transformer T and the transformer S to be tested) or the input end of the intermediate transformer T (between the power supply and the intermediate transformer T), and different test systems are respectively arranged according to the power supply phase number, the existence of the intermediate transformer T and different conditions of the capacitance compensation access point when the intermediate transformer T exists:
1. the short circuit bearing capacity test system of the transformer and the reactor adopts a single-phase or two-phase power supply, is provided with an intermediate transformer and a capacitance compensation circuit which is connected in parallel between the transformer S to be tested (or the reactor S to be tested) and the intermediate transformer T.
2. The short circuit bearing capacity test system adopts a transformer and a reactor which are supplied by a single-phase or two-phase power supply and provided with an intermediate transformer, and a capacitance compensation circuit is connected in parallel between the power supply and the intermediate transformer T.
3. The short circuit bearing capacity test system of the transformer and the reactor adopts a single-phase or two-phase power supply, has no intermediate transformer, and has a capacitance compensation circuit connected with the transformer S (or the reactor S) to be tested in parallel.
4. The short circuit bearing capacity test system of the transformer and the reactor adopts a three-phase power supply, is provided with an intermediate transformer and a capacitance compensation circuit which is connected in parallel between the transformer S to be tested (or the reactor S to be tested) and the intermediate transformer T.
5. The short circuit bearing capacity test system of the transformer and the reactor adopts a three-phase power supply, is provided with an intermediate transformer and is provided with a capacitance compensation circuit which is connected in parallel between the power supply and the intermediate transformer T.
6. The short circuit bearing capacity test system of the transformer and the reactor adopts a three-phase power supply, has no intermediate transformer and is provided with a capacitance compensation circuit which is connected with the transformer S (or the reactor S) to be tested in parallel.
Fig. 2 is a circuit diagram of a test of short circuit endurance of a transformer and a reactor which are powered by a single-phase or two-phase power supply, provided with an intermediate transformer and connected in parallel with a capacitance compensation circuit between the transformer S (or a reactor S to be tested) and the intermediate transformer T. In order to control and measure the current and voltage of the various branches of the system, a third disconnector K may be provided between the power supply and the intermediate transformer T5And a third current transformer CT4And a third circuit breaker K6Potential transformer PT3Fourth circuit breaker K7. A first isolating switch K is arranged between the intermediate transformer T and the capacitance compensation circuit1A first voltage transformer PT1First circuit breaker K3A second circuit breaker K4A first current transformer CT1A second current transformer CT is arranged between the capacitance compensation circuit and the transformer S (or the reactor S) to be tested2Lightning arrester P1 and voltage transformer PT2A third current transformer CT is arranged on the capacitance compensation circuit3And a disconnecting switch K2In order to adjust the test current, a reactor L is connected between the power supply and the transformer S to be tested (or the reactor S to be tested).
When a single-phase or two-phase power supply is adopted, an intermediate transformer is arranged, and a capacitance compensation circuit is connected between the power supply and the intermediate transformer T in parallel, a third isolating switch K is connected between the power supply and the intermediate transformer T5And a third current transformer CT4And a third circuit breaker K6Potential transformer PT3Fourth circuit breaker K7And a capacitance compensation circuit. A first isolating switch K is arranged between the transformer S to be tested (or the reactor S to be tested) and the intermediate transformer T1First circuit breaker K3A second circuit breaker K4A first current transformer CT1And a lightning arrester P1.
When a single-phase or two-phase power supply is adopted, an intermediate transformer is not arranged, and a capacitance compensation circuit is connected with the transformer S to be tested (or the reactor S to be tested) in parallel, a third isolating switch K is connected between the power supply and the capacitance compensation circuit5A first voltage transformer PT1First circuit breaker K3A second circuit breaker K4A first current transformer CT1A second current transformer CT is arranged between the capacitance compensation circuit and the transformer S (or the reactor S) to be tested2Lightning arrester P1 and voltage transformer PT2A third current transformer CT is arranged on the capacitance compensation circuit3And a disconnecting switch K2In order to adjust the test current, a reactor L is connected between the power supply and the transformer S to be tested (or the reactor S to be tested).
FIG. 3 is a diagram of a test circuit using a three-phase power supply and having an intermediate transformer and a capacitance compensation circuit connected in parallel between the transformer S to be tested (or the reactor S to be tested) and the intermediate transformer T, each phase of equipment being the same as that of a single-phase or two-phase power supply, i.e. a third isolating switch K is provided between the power supply and the intermediate transformer T5And a third current transformer CT4And a third circuit breaker K6Potential transformer PT3Fourth circuit breaker K7. A first isolating switch K is arranged between the intermediate transformer T and the capacitance compensation circuit1A first voltage transformer PT1First circuit breaker K3A second circuit breaker K4A first current transformer CT1A second current transformer CT is arranged between the capacitance compensation circuit and the transformer S (or the reactor S) to be tested2Lightning arrester P1 and voltage transformer PT2A third current transformer CT is arranged on the capacitance compensation circuit3And a disconnecting switch K2In order to adjust the test current, a reactor L is connected between the power supply and the transformer S to be tested (or the reactor S to be tested). During three-phase test, the compensation capacitor can be connected in Y or D.
The system for testing the short-circuit bearing capacity of the transformer and the reactor with the intermediate transformer can also connect the capacitance compensation circuit between the power supply and the intermediate transformer T in parallel, the three-phase power supply supplies power to the three-phase transformer S (or the reactor S to be tested) to be tested through the intermediate transformer T, and each phase of equipment is provided with the same equipment as that of single-phase or two-phase power supply.
The method is characterized in that a three-phase power supply is adopted for supplying power, a transformer without an intermediate transformer and a capacitance compensation circuit of a short-circuit bearing capacity test system of a reactor are connected with a transformer S (or a reactor S to be tested) to be tested in parallel, the three-phase power supply directly supplies power to the three-phase transformer S (or the reactor S to be tested), and each phase of equipment is provided with the same equipment as that of single-phase or two-phase power supply.
In the embodiment of the invention, when the intermediate transformer T exists and the capacitance compensation circuit can be connected in parallel between the transformer S to be tested (or the reactor S to be tested) and the intermediate transformer T, the test steps are as follows:
in step S1, before the test is started, the intermediate transformer T should be powered on in the following order: k5Closing, K6Closing, K7And (7) closing the switch. (K)5Must be at K6、K7Closing before full closing because of K5The on-off brake with current cannot be carried);
step S2, adjusting the numerical values of the reactor, the capacitor and the resistor, and adjusting the current which is less than 70% to debug the circuit;
step S3, K2Closing, K1Closing a switch;
step S4, K3Closing, K4Closing, K3Opening, K4Opening a brake to finish a current debugging circuit below 70%;
step S5, K1Brake separating K2Opening a brake;
step S6, adjusting the numerical values of the reactor, the capacitor and the resistor to meet the 100% current test;
step S7, K2Closing, K1Closing a switch;
step S8, K3Closing, K4Closing, K3Opening, K4Opening the gate to finish a 100% current test;
step S9, K1Brake separating K2Opening a brake;
step S10, measuring the reactance value of the transformer S (or the reactor S) to be tested;
repeating the steps S7-S10 twice;
step S11, the tested transformer is subjected to phase change and tapping, and the numerical value of the reactor is adjusted to meet the 100% current test;
repeating the steps S7-S10 three times;
step S12, the tested transformer is subjected to phase change and tapping, and the numerical value of the reactor is adjusted to meet the 100% current test;
steps S7 to S10 are repeated three times.
In each test, current is generated in the line and the tested transformer only in steps S4 and S8, and the current generation time is K3、K4At the moment of simultaneous switching-on, current flows through each equipment in the line, the capacitance compensation branch and the CT in sequence2The branches of the tested transformer S are connected in parallel, and the current magnitude relation flowing through each device is as follows: CT1Current of branch is i1The capacitance compensation branch current is i3The branch current of the tested transformer S is i2Then i is2＝i1+i3. After the test is finished, the power supply of the intermediate transformer is disconnected, and the sequence is as follows: k7Opening, K6Opening, K5And (7) opening the gate. (K)5Must be at K6、K7One is separated before being separated because K5Can not be switched on or off with current).
The selection of the compensation capacitor in the equivalent loop of the short circuit endurance test system for the transformer or reactor shown in fig. 2 and 3 is described with reference to fig. 4. The compensation capacitor is selected fromEnsuring the symmetrical value of the test current. Wherein, the power source U can be a system, a generator or a system and generator combined operation supply, wherein, only the power source branch is different. The compensation principle and calculation are similar. ZsIs the internal impedance of the power supply, ZitIs the intermediate transformer impedance, ZLIs an external series impedance, ZtC is the compensation capacitor. External series impedance ZLThe device is used for adjusting the test current value of test equipment and test article parameters at a certain time, and in addition, the device ensures that the absorbed energy of a loop does not exceed the energy allowed to be provided by a power supply and also ensures that the current passing through the intermediate transformer is less than other safe currents. Impedance of the test article ZtIs inversely proportional to product capacity, when there is no compensation
(C ═ 0), the specific test system has one ZtLimit value Zt1If Z istA value less than this (i.e., a larger sample capacity) does not produce the rated test current of the sample. The effect of the compensation capacitor C is in ZtLess than Zt1When is turned to ZtImpedance Z in parallel with Ct2Increase of Zt2≥Zt1Increase the voltage U of the test sample1And a test current value.
Inductor L for test article2Parallel impedance when connected in parallel with C:
when the maximum capacity of the uncompensated test transformer is W1Time (impedance Z)t1) If the transformer capacity W is larger2(impedance Z)t) In the test, the load impedance needs to be improved by using a capacitor C, which is:
According to the short circuit bearing capacity test system of the transformer or the reactor, provided by the embodiment of the invention, the test capacity can be improved for large-scale products, the operation is convenient, the capacitance compensation circuit is connected into the test system only in the existing operation mode, a plurality of sets of control systems are not needed, and the parallel operation control of the system and the generator is also not needed; active power and reactive power of the system and the generator are reduced, and reactive power is provided by the capacitance compensation circuit. Noise interference of the generator can be avoided without the generator.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (16)
1. A short circuit withstand capability test system of a transformer or a reactor is characterized by comprising:
the device comprises a power supply, a capacitance compensation circuit consisting of a compensation capacitor C, a transformer S to be tested or a reactor S to be tested; the capacitance compensation circuit is connected with the transformer S to be tested or the reactor S to be tested in parallel.
2. The short circuit withstand capability test system according to claim 1, wherein the capacitance compensation circuit further comprises:
a waveform adjustment resistor in series with the compensation capacitor C.
3. The short circuit withstand capability test system according to claim 2, wherein the waveform adjustment resistor comprises:
first waveform adjusting resistor R3And a second waveform adjusting resistor R4；
The first waveform adjusting resistor R3Adjusting the resistance R by a second waveform4Is connected to the compensation capacitor C.
4. The short circuit withstand capability test system of claim 3, wherein the capacitance compensation circuit further comprises:
third current transformer CT3And a second isolating switch K2(ii) a The third current transformer CT3Sequentially passes through the second isolating switch K2The first waveform adjusting resistor R3The second waveform adjusting resistor R4In series with the compensation capacitor C.
5. The short circuit withstand capability test system according to claim 4, wherein the capacitance compensation circuit further comprises:
by a protective resistor R5And protecting the ball gap or clearance P2A discharge protection circuit formed in series; the discharge protection circuit and the second waveform adjusting resistor R4And a branch circuit formed by a compensation capacitor C connected in parallel with the first waveform adjusting resistor R3And (4) connecting.
6. The short circuit withstand capability test system according to any one of claims 1 to 5, further comprising:
reactor L, first isolator K1A first voltage transformer PT1First circuit breaker K3A second circuit breaker K4A first current transformer CT1And a second current transformer CT2Lightning arrester P1 and second voltage transformer PT2；
When the power supply is single-phase or two-phase, on a phase output branch of the power supply: an output end of the power supply passes through the first voltage transformer PT1First circuit breaker K3A second circuit breaker K4First isolating switch K1A reactor L and a first current transformer CT1Respectively connected with the capacitance compensation circuit and the CT2Connecting; the CT2One end of the lightning arrester passes through the lightning arrester P1 and the voltage transformer PT2Is connected with the transformer S to be tested or the reactor S to be tested, and the other end of the transformer S to be tested or the reactor S to be tested is respectively connected with the first current transformer CT1And the capacitance compensation circuit is connected;
when the power supply is three-phase, on each phase output branch of the power supply: each phase output of the power supply passes through a first voltage transformer PT1First circuit breaker K3A second circuit breaker K4First isolating switch K1A reactor L and a first current transformer CT1Respectively connected with the capacitance compensation circuit and the CT2Connecting; the CT2One end of the lightning arrester passes through the lightning arrester P1 and the voltage transformer PT2Is connected with the transformer S to be tested or the reactor S to be tested, and the other end of the transformer S to be tested or the reactor S to be tested is respectively connected with the first current transformer CT1And the capacitance compensation circuit is connected.
7. The short circuit withstand capability test system according to any one of claims 1 to 5, further comprising:
an intermediate transformer T for adjusting the supply voltage; the intermediate transformer T is connected between the power supply and the transformer S to be tested or the reactor S to be tested.
8. The short circuit withstand capability test system according to claim 7, further comprising:
third isolating switch K5The third current mutual inductanceCT device4And a third circuit breaker K6Potential transformer PT3Fourth circuit breaker K7；
When the power supply is single-phase, two-phase or three-phase, each phase of the power supply passes through a third isolating switch K connected in series5And a third current transformer CT4And a third circuit breaker K6Potential transformer PT3And a fourth circuit breaker K7Is connected with the intermediate transformer T.
9. The short circuit withstand capability test system according to claim 8, further comprising:
reactor L, first isolator K1A first voltage transformer PT1First circuit breaker K3A second circuit breaker K4A first current transformer CT1And a second current transformer CT2Lightning arrester P1 and second voltage transformer PT2；
When the power supply is single-phase or two-phase, on a phase output branch of the intermediate transformer T: one phase output end of the intermediate transformer T passes through the first voltage transformer PT1First circuit breaker K3A second circuit breaker K4First isolating switch K1A reactor L and a first current transformer CT1Respectively connected with the capacitance compensation circuit and the CT2Connecting; the CT2One end of the lightning arrester passes through the lightning arrester P1 and the voltage transformer PT2Is connected with the transformer S to be tested or the reactor S to be tested, and the other end of the transformer S to be tested or the reactor S to be tested is respectively connected with the first current transformer CT1And the capacitance compensation circuit is connected;
when the power supply is three-phase, on each phase output branch of the intermediate transformer T: each phase output of the intermediate transformer T passes through a first voltage transformer PT1First circuit breaker K3A second circuit breaker K4First isolating switch K1A reactor L and a first current transformer CT1Respectively connected with the capacitance compensation circuit and the CT2Connecting; the CT2One end of the lightning arrester passes through the lightning arrester P1 and the voltage transformer PT2Is connected with the transformer S to be tested or the reactor S to be tested, and the other end of the transformer S to be tested or the reactor S to be tested is respectively connected with the first current transformer CT1And the capacitance compensation circuit is connected.
10. The short circuit withstand capability test system according to claim 7, further comprising:
third isolating switch K5And a third current transformer CT4And a third circuit breaker K6Potential transformer PT3Fourth circuit breaker K7；
When the power supply is single-phase, two-phase or three-phase, each phase of the power supply passes through a third isolating switch K connected in series5And a third current transformer CT4And a third circuit breaker K6Potential transformer PT3Fourth circuit breaker K7And the intermediate transformer T and the capacitance compensation circuit are respectively connected.
11. The short circuit withstand capability test system according to claim 10, further comprising:
when the power supply is single-phase or two-phase, on one-phase output branch of the intermediate transformer T: an output end of the intermediate transformer T passes through a first voltage transformer PT1First circuit breaker K3A second circuit breaker K4First isolating switch K1A reactor L and a first current transformer CT1And a second current transformer CT2Lightning arrester P1 and second voltage transformer PT2The transformer S to be tested or the reactor S to be tested is connected;
when the power supply is three-phase, on each phase output branch of the intermediate transformer T: each phase output end of the intermediate transformer T passes through a first voltage transformer PT1First circuit breaker K3A second circuit breaker K4First isolating switch K1A reactor L and a first current transformer CT1And a second current transformer CT2Lightning arrester P1 and second voltage transformer PT2And the transformer S to be tested or the reactor to be testedAnd S is connected.
12. The short circuit withstand capability test system according to any one of claims 1 to 5, wherein:
when the capacitance compensation circuit is connected in parallel between the transformer S to be tested or the reactor S to be tested and the intermediate transformer T, or the capacitance compensation circuit is connected in parallel between the power supply and the intermediate transformer T, the minimum guaranteed value of the compensation capacitance is determined according to the following formula:
wherein,
the W is1Represents the maximum test capacity that the test system can provide without capacitance compensation;
the W is2Represents the test capacity that the test system can provide with capacitance compensation;
z ist1The short-circuit impedance value of the transformer S to be tested or the reactor S to be tested corresponding to the W1 test capacity;
and omega is the power frequency angular frequency.
13. A short-circuit test method of using the system according to any one of claims 1 to 5 for a transformer or a reactor, characterized by comprising:
and the capacitance compensation circuit is connected between the power supply and the transformer S to be tested or the reactor S to be tested so as to improve the test capacity of the short-circuit test system of the transformer and the reactor.
14. The method of claim 13, wherein the minimum guaranteed value of the compensation capacitance is determined according to the following equation:
wherein,
the W is1Represents the maximum test capacity that the test system can provide without capacitance compensation;
the W is2Represents the test capacity that the test system can provide with capacitance compensation;
z ist1The short-circuit impedance value of the transformer S to be tested or the reactor S to be tested corresponding to the W1 test capacity;
and omega is the power frequency angular frequency.
15. A short-circuit test method of using the system according to any one of claims 1 to 5 for a transformer and a reactor, characterized in that: the system further comprises an intermediate transformer T; the intermediate transformer T is connected between the power supply and a transformer S to be tested or a reactor S to be tested;
the capacitance compensation circuit is connected between the intermediate transformer T and the transformer S to be tested or the reactor S to be tested so as to improve the test capacity of the short-circuit test system of the transformer and the reactor; or
And the capacitance compensation circuit is connected between the power supply and the intermediate transformer T so as to improve the test capacity of the short-circuit test system of the transformer and the reactor.
16. The method of claim 15, wherein the minimum guaranteed value of the compensation capacitance is determined according to the following equation:
wherein,
the W is1Represents the maximum test capacity that the test system can provide without capacitance compensation;
the W is2Represents the test capacity that the test system can provide with capacitance compensation;
z ist1The short-circuit impedance value of the transformer S to be tested or the reactor S to be tested corresponding to the W1 test capacity;
and omega is the power frequency angular frequency.
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| CN103063987A (en) * | 2012-12-24 | 2013-04-24 | 保定天威保变电气股份有限公司 | Test method of dry type smoothing reactor end-to-end medium-frequency oscillator capacitor discharge |
| CN103529352A (en) * | 2013-10-29 | 2014-01-22 | 国家电网公司 | On-line monitoring system capable of monitoring short-circuit force applied to running transformer |
| 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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| CN103529352A (en) * | 2013-10-29 | 2014-01-22 | 国家电网公司 | On-line monitoring system capable of monitoring short-circuit force applied to running transformer |
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