CN108037448B - On-load tap changer switching test device - Google Patents
On-load tap changer switching test device Download PDFInfo
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- CN108037448B CN108037448B CN201711489707.3A CN201711489707A CN108037448B CN 108037448 B CN108037448 B CN 108037448B CN 201711489707 A CN201711489707 A CN 201711489707A CN 108037448 B CN108037448 B CN 108037448B
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- 239000003990 capacitor Substances 0.000 claims abstract description 36
- 230000001360 synchronised effect Effects 0.000 claims abstract description 15
- 230000001105 regulatory effect Effects 0.000 claims abstract description 10
- 230000005571 horizontal transmission Effects 0.000 claims description 5
- 230000005570 vertical transmission Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 description 6
- 238000004804 winding Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000012544 monitoring process Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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- Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)
Abstract
The invention relates to a switching test device of an on-load tap changer, which comprises a power supply, a synchronous driving mechanism, an accompanying on-load tap changer, a reactor and a capacitor, wherein the power supply is connected with the synchronous driving mechanism; the tested on-load tap changer and the accompanying on-load tap changer are both connected with a power supply, the tested on-load tap changer and the accompanying on-load tap changer are respectively connected with one of a reactor and a capacitor in different ways, and the reactor and the capacitor are connected with the power supply; the synchronous driving mechanism is connected with the on-load voltage regulating switch for accompanying test and the on-load voltage regulating switch to be tested and is used for driving the on-load voltage regulating switch for accompanying test and the on-load voltage regulating switch to be tested to be synchronously switched. The on-load tap changer switching test device can realize the switching action of the tested on-load tap changer under the condition of load, effectively simulate the actual running state and improve the switching test equivalence of various performances of the on-load tap changer.
Description
Technical Field
The invention relates to the technical field of electrical equipment detection, in particular to a switching test device for an on-load tap changer.
Background
The on-load tap changer is a movable component in the on-load tap changer, and can accurately and timely act by means of the on-load tap changer, so that not only can the large-amplitude fluctuation of voltage be reduced and avoided, but also the load current can be forcibly distributed, the safe and reliable operation of a power system is ensured, and the flexibility of power grid dispatching is increased. In order to ensure safe and reliable operation of the on-load tap changer, a switching test of the on-load tap changer is generally required.
Due to the complexity of the mechanical mechanism of the on-load tap changer and the diversity of mechanical faults, the common mechanical fault under the actual operation state is very difficult to simulate on a real on-load tap changer. The traditional on-load tap changer switching test is mostly an uncharged test, and an electric mechanism is adopted to drive the uncharged on-load tap changer to carry out switching action. However, in actual operation, the switching action process of the on-load tap changer is accompanied by the switching process of voltage and current, the actual operation state of the on-load tap changer cannot be effectively simulated by the uncharged test, and the test equivalence is low.
Disclosure of Invention
Therefore, it is necessary to provide an on-load tap changer switching test device capable of improving test equivalence for solving the problem of low equivalence of the conventional on-load tap changer switching test.
A switching test device for an on-load tap changer comprises a power supply, a synchronous driving mechanism, an accompanying on-load tap changer, a reactor and a capacitor;
the tested on-load tap changer and the accompanying on-load tap changer are both connected with the power supply, the tested on-load tap changer and the accompanying on-load tap changer are respectively connected with one of the reactor and the capacitor in different ways, and the reactor and the capacitor are connected with the power supply;
the synchronous driving mechanism is connected with the accompanying on-load tap changer and the tested on-load tap changer and used for driving the accompanying on-load tap changer and the tested on-load tap changer to be synchronously switched.
According to the on-load tap-changer switching test device, the on-load tap-changer accompanied by test, the on-load tap-changer to be tested, the capacitor and the reactor are connected with the power supply, the on-load tap-changer accompanied by test, the on-load tap-changer to be tested, the reactor and the capacitor form a parallel resonance test circuit, and the synchronous driving mechanism drives the on-load tap-changer accompanied by test and the on-load tap-changer to be synchronously switched, so that the switching action of the on-load tap-changer to be tested under the condition of load can be realized, the actual running state can be effectively simulated, and the switching test equivalence of various performances of the.
Drawings
FIG. 1 is a block diagram of an on-load tap changer switching test apparatus according to an embodiment;
FIG. 2 is a block diagram of a switching test device of an on-load tap changer in another embodiment;
FIG. 3 is a front view of an on-load tap changer switching test apparatus in one embodiment;
FIG. 4 is a side view of the on-load tap changer switching test apparatus of the embodiment of FIG. 3;
fig. 5 is a top view of the on-load tap changer switching test device of the embodiment shown in fig. 3;
fig. 6 is a schematic structural diagram of an on-load tap changer switching test device in an application example.
Detailed Description
Referring to fig. 1, an on-load tap changer switching test apparatus in one embodiment includes a power supply 110, a synchronous drive mechanism (not shown), a test-assistant on-load tap changer 120, a reactor L, and a capacitor C.
The tested on-load tap changer 200 and the accompanying on-load tap changer 120 are both connected with the power supply 110, the tested on-load tap changer 200 and the accompanying on-load tap changer 120 are respectively connected with one of a reactor L and a capacitor C in different ways, and the reactor L and the capacitor C are connected with the power supply 110. The synchronous driving mechanism is connected with the test-accompanying on-load tap changer 120 and the tested on-load tap changer 200 and used for driving the synchronous switching of the test-accompanying on-load tap changer 120 and the tested on-load tap changer 200.
The tested on-load tap changer 200 and the accompanied on-load tap changer 120 are respectively connected with one of the reactor L and the capacitor C differently, the tested on-load tap changer 200 is connected with the reactor L, the accompanied on-load tap changer 120 is connected with the capacitor C, or the tested on-load tap changer 200 is connected with the capacitor C, and the accompanied on-load tap changer 120 is connected with the reactor L. The loop of the reactor L is a reactance loop, and the loop of the capacitor C is a capacitance loop. In this embodiment, specifically, the on-load tap changer 200 to be tested is connected to the reactor L, and the on-load tap changer 120 to be tested is connected to the capacitor C.
The on-load tap changer 200 to be tested is an on-load tap changer that requires a switching test. Most of the on-load voltage regulation switches are M-type switches, three phase neutral points of the on-load voltage regulation switches are connected in the switches, and a single on-load voltage regulation switch cannot realize work load switching. The on-load tap changer 120 and the on-load tap changer 200 to be tested are connected with the power supply 110, the on-load tap changer 120, the on-load tap changer 200 to be tested, the reactor L and the capacitor C form a parallel resonance test circuit, and the on-load tap changer 120 and the on-load tap changer 200 to be tested are respectively connected in series in a reactance loop and a capacitance loop of the circuit; the synchronous driving mechanism drives the accompanying on-load tap changer 120 and the tested on-load tap changer 200 to be synchronously switched, so that the phenomenon that the circuit tripping is caused by the action of a circuit relay protection device due to the fact that a large working current is caused by overlong non-resonance time of a parallel resonance test circuit is avoided. The working process of the on-load tap changer switching test device is as follows: when the switching operation is not executed, the reactance loop and the capacitance loop generate resonance, the current flowing through the loops is the load current, and the total loop current of the parallel resonance test circuit is approximately zero; when the switching operation is executed, load conversion occurs, and the accompanying on-load tap changer 120 and the tested on-load tap changer 200 exchange load lines, so that the work load switching is realized.
According to the on-load tap-changer switching test device, the on-load tap-changer 120, the on-load tap-changer 200 to be tested, the capacitor C and the reactor L are connected with the power supply 110, the on-load tap-changer 120 to be tested, the on-load tap-changer 200 to be tested, the reactor L and the capacitor C form a parallel resonance test circuit, and the synchronous driving mechanism drives the on-load tap-changer 120 to be tested and the on-load tap-changer 200 to be synchronously switched, so that the switching action of the on-load tap-changer 200 to be tested under the condition of load can be realized, the actual operation state can be effectively simulated, and the switching test equivalence of various performances of the on-load.
Specifically, the power supply 110 is a three-phase transformer for providing three-phase voltages to the test-attached on-load tap changer 120 and the tested on-load tap changer 200.
In one embodiment, referring to fig. 2, the power supply 110 is a three-phase asymmetric transformer, the primary side T1 of the three-phase asymmetric transformer is connected to three-phase voltage, and the secondary side T2 of the three-phase asymmetric transformer is connected to the on-load tap changer 200 under test, the on-load tap changer 120 under test, the reactor L and the capacitor C. For example, the primary side T1 of a three-phase asymmetric transformer may be tapped into a 35KV (kilovolt) three-phase incoming line.
The secondary side T2 of the three-phase asymmetric transformer includes three connection terminals. Referring to fig. 2, a first connection terminal connects the on-load tap changer under test 120 and the on-load tap changer under test 200, a second connection terminal connects the on-load tap changer under test 200 and the on-load tap changer under test 120, and a third connection terminal connects the reactor L and the capacitor C. For example, a three-phase asymmetric transformer model YSF-6950/35 may be used, with the following parameters:
capacity: 6950kVA (kilovolt ampere); primary side voltage: 35 kV; secondary side voltage/current: phase a: 9.0kV/350A, b/c phase: 3.4kV/1000A or 500A; combinable stage voltages: 164V-6183V; short-time impact capacity of the three-phase asymmetric transformer: 46000 kVA.
In one embodiment, the synchronous drive mechanism includes an electric operating mechanism and an interlock link connecting the electric operating mechanism, the on-load tap changer 200 under test and the attendant on-load tap changer 120 under test. The electric operating mechanism drives the interlocking connecting rod to rotate, and the interlocking connecting rod drives the on-load voltage regulating switch 120 to be tested and the on-load voltage regulating switch 200 to be synchronously switched. By adopting the electric operating mechanism and the interlocking connecting rod, the tested on-load tap changer 200 and the accompanying on-load tap changer 120 can be driven by electricity, and the use is convenient and the safety is high.
Specifically, the interlock link may include a horizontal drive shaft and a vertical drive shaft. The electric operating mechanism is connected with the vertical transmission shaft, and the vertical transmission shaft is connected with the horizontal transmission shaft through a bearing; the horizontal transmission shaft is connected with the test-accompanying on-load tap changer 120 and the tested on-load tap changer 200 and is used for driving the test-accompanying on-load tap changer 120 and the tested on-load tap changer 200 to be switched simultaneously.
In one embodiment, the test-attendant on-load tap-changer 120 is the same type of on-load tap-changer as the corresponding synchronously switched on-load tap-changer 200 under test. By adopting the on-load tap changer with the same model as the tested on-load tap changer 200 as the tested on-load tap changer 120 synchronously switched in the switching test process, the equivalence of the switching test can be further improved.
In one embodiment, the number of the reactors L and the capacitors C is plural, a plurality of the reactors L are connected in series, and a plurality of the capacitors C are connected in parallel. After the plurality of reactors L are connected in series, the reactor L at one end is connected with the on-load tap changer 200 to be tested, the reactor L at the other end is connected with the power supply 110, after the plurality of capacitors C are connected in parallel, one end is connected with the on-load tap changer 120 to be tested, and the other end is connected with the power supply 110. It is to be understood that, in other embodiments, after a plurality of reactors L are connected in series, one end of the reactor L is connected to the on-load tap changer 120 to be tested, and the other end of the reactor L is connected to the power supply 110, and after a plurality of capacitors C are connected in parallel, one end of the reactor L is connected to the on-load tap changer 200 to be tested, and the other end of the reactor L is connected to the power supply 110.
By adopting a plurality of series-connected reactors L and a plurality of parallel-connected capacitors C, the number of the reactors L and the capacitors C in the parallel resonance test circuit can be changed, so that the electrical parameters of the circuit can be changed, the load current can be adjusted, and the convenience of the switching test can be improved. In this embodiment, 100 capacitors of the type BFM12/√ 3-334-1, 22.8 μ F (microfarads) for a single capacitor, may be used.
In one embodiment, reactor L is a tunable reactor. By adopting the adjustable reactor, the reactance value can be conveniently adjusted, so that the electrical parameters in the parallel resonance test circuit can be adjusted, the load current can be adjusted, and the convenience of a switching test can be improved. For example, each adjustable reactor consists of two windings, each winding has 7 middle taps, the reactance value is adjustable in a segmented mode from 15.71 omega to 21.57 omega, the rated through current is 350A, and 3 adjustable reactors are adopted in total.
It is understood that in other embodiments, the reactor L may also be a stationary reactor. For example, each fixed reactor is composed of two windings, each winding has a reactance value of 18.33 Ω and a rated passing current of 300A, and a total of 4 fixed reactors are adopted.
In one embodiment, the on-load tap-changer switching test device further includes a current transformer and a voltage transformer, the current transformer is connected in series in a line where the on-load tap-changer 200 to be tested and the on-load tap-changer 120 to be accompanied are connected with the power supply 110, and the voltage transformer is connected with the on-load tap-changer 200 to be accompanied and the on-load tap-changer 120 to be accompanied.
Through adopting current transformer and voltage transformer, can monitor alternating voltage, the electric current of switching in-process, be convenient for in time know the experimental condition. For example, referring to FIG. 2, four current transformers are used to monitor the current I separatelyA、IB、IA1、IB1(ii) a Monitoring of voltage U with four voltage transformersA、UB、UA1、UB1。
In one embodiment, referring to fig. 3-5, the on-load tap changer switching test device further comprises a sealed oil tank 130, and the on-load tap changer 200 to be tested is placed in the sealed oil tank 130.
The on-load tap changer is installed in the oil chamber of the transformer in practical application. By adopting the sealed oil tank 130 to place the tested on-load tap changer 200, the working environment of actual operation can be effectively and accurately simulated, so that the switching test result can more accurately reflect the actual situation, and the equivalence of the switching test is improved. Specifically, in fig. 5, W denotes a horizontal drive shaft.
By adopting the on-load tap changer switching test device, the actual operation environment of the on-load tap changer can be effectively simulated, meanwhile, the switching process of adjustable voltage and adjustable load current of the on-load tap changer can be realized, and the on-load switching performance and the actual working condition of the on-load tap changer are verified. The stage voltage refers to the superposed working voltage between the same-phase adjacent taps of the on-load voltage regulating switch, and the value is the working voltage difference between the switching loads; the load current is the current passing through the on-load voltage regulating switch; the stage voltage is provided by the in-line power supply 110, and the stage voltage can be adjusted by changing the tap of the output winding of the power supply 110; the load current is adjusted by changing the quantity of the reactor L and the capacitor C in the parallel resonance test circuit, thereby changing the electrical parameters of the circuit. For example, in a specific application example, the structure diagram of the on-load tap changer switching test device is shown in fig. 6, and the following capacity ranges can be satisfied:
1. and (3) working load test: and when the maximum stage voltage is 4000V, the rated current is not more than 1500A.
2. And (3) working load test: and when the maximum level voltage is 6000V, the rated current is not more than 1000A.
3. Capacity test on break (40): the maximum stage voltage is 4000V, and the rated current is not more than 3000A.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (7)
1. A switching test device for an on-load tap changer is characterized by comprising a power supply, a synchronous driving mechanism, an accompanying on-load tap changer, a reactor and a capacitor;
the tested on-load tap changer and the accompanying on-load tap changer are both connected with the power supply, the tested on-load tap changer and the accompanying on-load tap changer are respectively connected with one of the reactor and the capacitor in different ways, and the reactor and the capacitor are connected with the power supply;
the synchronous driving mechanism is connected with the accompanying on-load voltage regulation switch and the tested on-load voltage regulation switch and is used for driving the accompanying on-load voltage regulation switch and the tested on-load voltage regulation switch to be synchronously switched;
the synchronous driving mechanism comprises an electric operating mechanism and an interlocking connecting rod, and the interlocking connecting rod comprises a horizontal transmission shaft and a vertical transmission shaft; the electric operating mechanism is connected with the vertical transmission shaft, the vertical transmission shaft is connected with the horizontal transmission shaft through a bearing, and the horizontal transmission shaft is connected with the accompanying on-load voltage regulating switch and the tested on-load voltage regulating switch.
2. The on-load tap changer switching test device of claim 1, wherein the power supply is a three-phase asymmetric transformer, a primary side of the three-phase asymmetric transformer is connected with three-phase voltage, and a secondary side of the three-phase asymmetric transformer is connected with the on-load tap changer to be tested, the reactor and the capacitor.
3. The on-load tap changer switching test device of claim 1, wherein the on-load tap changer being commissioned is an on-load tap changer of the same type as the tested on-load tap changer that is correspondingly synchronously switched.
4. The on-load tap changer switching test device of claim 1, wherein the number of the reactors and the number of the capacitors are multiple, the reactors are connected in series, and the capacitors are connected in parallel.
5. The on-load tap changer switching test device of claim 1, wherein the reactor is a tunable reactor.
6. The on-load tap changer switching test device of claim 1, further comprising a current transformer and a voltage transformer, wherein the current transformer is connected in series with a line of the power supply connected with the on-load tap changer to be tested and the on-load tap changer to be accompanied, and the voltage transformer is connected with the on-load tap changer to be tested and the on-load tap changer to be accompanied.
7. The on-load tap changer switching test device of any one of claims 1-6, further comprising a sealed oil tank, wherein the on-load tap changer to be tested is placed in the sealed oil tank.
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| CN201711489707.3A CN108037448B (en) | 2017-12-30 | 2017-12-30 | On-load tap changer switching test device |
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| CN201711489707.3A CN108037448B (en) | 2017-12-30 | 2017-12-30 | On-load tap changer switching test device |
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| CN108037448B true CN108037448B (en) | 2020-05-12 |
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| CN112014727B (en) * | 2020-07-15 | 2022-09-16 | 南方电网科学研究院有限责任公司 | Testing device for harmonic current switching capacity of tap switch |
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| DE19530776C1 (en) * | 1995-08-22 | 1996-12-12 | Reinhausen Maschf Scheubeck | Monitoring method for staged load switching device |
| CN201107397Y (en) * | 2007-11-29 | 2008-08-27 | 国网武汉高压研究院 | Calibration device for transformer on-load tap-changer tester |
| CN202351396U (en) * | 2011-11-03 | 2012-07-25 | 杭州高电科技有限公司 | On-load tap-changer testing device |
| CN102723183A (en) * | 2012-01-04 | 2012-10-10 | 吴江市东泰电力特种开关有限公司 | Inductance type on-load tap-changer |
| DE202012101039U1 (en) * | 2012-03-23 | 2013-06-24 | Maschinenfabrik Reinhausen Gmbh | Test system for tap changers of high power without influence on the power grid |
| CN202795858U (en) * | 2012-09-25 | 2013-03-13 | 浙江省电力公司电力科学研究院 | On-load tap-changer simulation device of transformer |
| DE102013100266A1 (en) * | 2013-01-11 | 2014-07-17 | Maschinenfabrik Reinhausen Gmbh | OLTC |
| CN104483626B (en) * | 2014-12-30 | 2017-08-08 | 国网四川省电力公司电力科学研究院 | On-load tap changers of transformers characteristic test device and system |
| CN204884832U (en) * | 2015-08-26 | 2015-12-16 | 杭州佰盟智能开关有限公司 | Hybrid on -load voltage -regulating transformer |
| CN206312473U (en) * | 2016-11-12 | 2017-07-07 | 国家电网公司 | On-load tap changers of transformers acts demonstration device |
| CN107068368B (en) * | 2017-05-11 | 2019-01-29 | 山东电工电气集团智能电气有限公司 | A kind of dry-type on-load tap changer circuit and its capacity transfer and pressure regulation method |
| CN207832968U (en) * | 2017-12-30 | 2018-09-07 | 广州供电局有限公司 | On-load voltage regulating switch switching tests device |
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- 2017-12-30 CN CN201711489707.3A patent/CN108037448B/en active Active
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| Status and trends in transformer monitoring;C. Bengtsson;《IEEE Transactions on Power Delivery 》;19960731;全文 * |
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Effective date of registration: 20200921 Address after: 510620 Tianhe District, Guangzhou, Tianhe South Road, No. two, No. 2, No. Patentee after: Guangzhou Power Supply Bureau of Guangdong Power Grid Co.,Ltd. Address before: 510620 Tianhe District, Guangzhou, Tianhe South Road, No. two, No. 2, No. Patentee before: GUANGZHOU POWER SUPPLY Co.,Ltd. |