CN113049924A - Extra-high voltage extra-large capacitance test article alternating current voltage withstand test device - Google Patents
Extra-high voltage extra-large capacitance test article alternating current voltage withstand test device Download PDFInfo
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- CN113049924A CN113049924A CN202110223352.3A CN202110223352A CN113049924A CN 113049924 A CN113049924 A CN 113049924A CN 202110223352 A CN202110223352 A CN 202110223352A CN 113049924 A CN113049924 A CN 113049924A
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
Abstract
The invention relates to the field of detecting the electrical performance of ultrahigh-voltage electrical equipment, in particular to an extra-high voltage extra-large capacitance test article alternating-current withstand voltage test device which comprises a variable-frequency power supply and a test transformer connected with the variable-frequency power supply, wherein the test transformer is connected with a first group of reactor groups in series, then is connected with a voltage-dividing capacitor and a tested article, and is then connected with a control box and a voltmeter, and an output circuit of the control box is connected with the variable-frequency power supply to form a loop; the voltage division capacitor is connected with the tested object in parallel; and the voltage division capacitor is connected with a second group of reactor groups in parallel. The device not only meets the test requirements of the converter station, but also meets the universality of withstand voltage tests of electrical equipment of 500kV and above, can be applied to new construction and 750kV-1100kV alternating current and direct current transmission engineering, and is high in applicability, light in weight and convenient for field transportation.
Description
Technical Field
The invention relates to the field of detection of electrical performance of ultrahigh voltage electrical equipment, in particular to an extra-high voltage extra-large capacitance test article alternating current withstand voltage test device.
Background
And carrying out a full-voltage alternating-current withstand voltage test on a +/-800 kV Qishao ultra-high voltage direct current project 750kV GIS equipment site. The length of a 750kV main bus is 877 m, 22 incoming and outgoing line intervals are totally formed, and the bus length is Asia-first. According to the technical scheme, a full voltage (factory test voltage 960kV) test is required on site, and a full voltage alternating current withstand voltage test on the site of an ultra-long bus is developed for the first time in China; urban construction, city beautification, power cable laying of 10km35kV and above, and high-voltage submarine power cable laying. The partial pressure capacitance is very large, and the existing equipment and strategy can not meet the test requirements.
After the equipment is transported and installed, a handover test is required according to regulation, the electrical insulation performance of the equipment is checked, the manufacturing process, the transportation and the installation quality of the equipment are checked, and some most original data are provided for future operation and maintenance. The test is completed by collecting relevant parameters of tested products (GIS equipment and power cables), estimating the total capacitance of the equipment according to the length, the structure and the voltage level, planning the capacity of the required test equipment, designing a test strategy and designing a test equipment system diagram. Taking an on-site alternating-current voltage withstand test of an ultra/ultra-high voltage 750kVGIS bus as an example, the following problems need to be considered by a test device:
1) and carrying out full voltage test on site, and providing new requirements for test equipment configuration. The existing equipment is configured according to 80% factory test voltage (768kV), and cannot meet the test device meeting 100% factory test voltage (960 kV).
2) The ultra-long bus has more intervals and large comprehensive capacitance, and the test system needs to consider the equipment capacity and compensate and optimize.
3) The test frequency is controlled to be larger than 30Hz, and various parameters of test system equipment are designed, namely, the frequency is considered to be too low to meet the regulation requirement, and the frequency is considered to be too high, so that the voltage caused by corona loss cannot reach the required value of the test. The test system considers and designs various parameters of the test equipment according to the range of 45-90Hz, and ensures the best compensation effect, the small corona loss and the minimum active current. The existing equipment is not satisfied;
4) the test pressurizing process is prolonged, the aging time is from 5 minutes to 3 minutes to 1 minute according to the standard, the requirement of the project is from 30 minutes to 15 minutes to 1 minute, and the existing equipment cannot meet the requirement;
5) the alternating-current withstand voltage test of the power cable also needs to consider the requirement of 1-hour thermal stability of test equipment.
6) The installation removes, avoids the repeated pressurization in same position, and equipment removal and installation are not considered in current equipment.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an extra-high voltage extra-large capacitance test article alternating current withstand voltage test device, which not only meets the test requirements of a converter station, but also meets the universality of withstand voltage tests of electrical equipment of 500kV and above, and can be applied to new construction and construction of 750kV-1100kV alternating current and direct current transmission projects.
In order to achieve the above purpose, the technical solution adopted by the present application is as follows:
the utility model provides an extra-high voltage especially big electric capacity sample exchanges withstand voltage test device which characterized in that: the test transformer is connected with a voltage division capacitor and a tested object after being connected with a first group of reactor groups in series, and then is connected with a control box and a voltmeter, and an output circuit of the control box is connected with the variable frequency power supply to form a loop;
the voltage division capacitor is connected with the tested object in parallel;
and the voltage division capacitor is connected with a second group of reactor groups in parallel.
The variable frequency power supply, the test transformer, the voltage division capacitor, the tested object, the first group of reactor groups and the second group of reactor groups are connected through anti-corona wires.
The first reactor group and the second reactor group are both provided with a plurality of reactors connected in parallel.
The reactor adopts a cake-type four-section series reactor.
2) The invention has the beneficial effects that: the design of the invention focuses on the field handover test of the extra-high voltage electrical equipment, the universality and the flexibility of the equipment parameter configuration are considered, the Qiji converter ultra-long bus alternating-current withstand voltage test is successfully completed, and the device is popularized and applied to Changji converter stations and 1100kV voltage class tests. The system can achieve the following effects: 1) the test device has wide application, can meet the handover test of electrical equipment of 110kV and above, and is more suitable for the test of power cables of 5 kilometers and above; 2) the single test device has light weight, small capacity, convenient installation and convenient transportation; 3) the manufacturing cost of the equipment is reduced; 4) through test and inspection, the parameters of the equipment meet the test requirements, and the measured data is consistent with the calculated data.
Drawings
FIG. 1 is a test wiring diagram of the present invention;
FIG. 2 is a schematic wiring diagram of a 750kV ultra-large capacitance sample boost test;
shown in the figure: l is21、...L2nA first set of reactors; l is11、L12、....L1nThe second group of reactors; c is a voltage-dividing capacitor; tr is a test transformer.
Detailed Description
The technical scheme of the invention is further explained by specific embodiments in the following with the accompanying drawings:
example 1
Fig. 1 shows a wiring diagram for a variable frequency series resonance ac voltage withstand test, that is, a wiring schematic diagram of the present embodiment, in which the specific connection manner is as follows:
the variable frequency power supply is connected with a test transformer Tr through an anti-corona lead, and after the transformer is connected with the first group of reactors in series, the variable frequency power supply is connected with the second group of reactors, the voltage division capacitor C and a tested product through the anti-corona lead. And the second group of reactors, the voltage-dividing capacitor C and the tested object are connected in parallel.
The output circuit of the circuit is connected with the control box and the voltmeter through the conducting wires, and the output circuit of the control box is connected with the variable frequency power supply to form a complete wiring loop.
Meanwhile, the first reactor group and the second reactor group are both provided with a plurality of reactors connected in parallel, and the first reactor group is L21、...L2nThe second group of reactors is L11、L12、....L1n，L21、...L2n；L11、L12、....L1nFour sections of serial reactors in a cake-folding type are adopted.
The series resonance circuit in the alternating current withstand voltage test wiring diagram is additionally provided with the compensation circuit for compensating the capacitance current in the circuit, so that the equipment capacity of a single reactor is effectively reduced, and a test power supply is reduced.
The first group of reactor groups are used for compensation, and the second group of reactor groups are used for forming a resonant circuit, so that the weight of a single device can be effectively reduced, and the device is convenient to transport on site and assemble.
Embodiment 2-750 kV GIS equipment of extra-high voltage +/-800 kV converter station
Rated voltage: 770kV
The length of the bus is as follows: 877 m in length, the grain size is small,
the number of intervals: 22 are provided
Actually measuring the comprehensive capacitance: 5.716X 104pF。
The loop capacitance current I2 pi fCU 15.38A (frequency f is 30Hz, U is 960kV), since the capacitance current is opposite to the inductance current, a proper capacitance reactance is selected to compensate, the power supply capacity is reduced, and the ideal resonance is L21、L2nThe current in (1) is zero.
The reactance parameter is correctly calculated according to the actual use. Considering the configuration of a single-section reactance 300kV, the reactance value is 12A and 80H; and 6A, 150H. In the bus withstand voltage test of the converter station, four sections 12A and 80H are connected in series as shown in FIG. 2, capacitance current in a compensation loop is compensated, and the other four sections 4 and 150H are connected in series and connected with the high-voltage end of a transformer.
The total loop impedance is: 80 × 4 × 150 × 4/4(150+80) ═ 208.7H, with a test frequency of 53 Hz. According to the current distribution principle: the current flowing through the 80H reactor was 10.1A and the current flowing through the 150H reactor was 5.2A, corresponding to the actual measurements.
Selecting parameters of the reactor: the frequency is selected from 45-130Hz according to
Selecting reactance value, selecting rated current according to required capacity, considering the universality of equipment, generally selecting 200H,1 for single reactance value50H,80H, and rated current selection 6(5) A, 12(10) A. Not only overcomes the difficulty of manufacturing a single large-capacity reactance, but also controls the weight to be about 2.4 tons.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (4)
1. The utility model provides an extra-high voltage especially big electric capacity sample exchanges withstand voltage test device which characterized in that: the test transformer is connected with a voltage division capacitor and a tested object after being connected with a first group of reactor groups in series, and then is connected with a control box and a voltmeter, and an output circuit of the control box is connected with the variable frequency power supply to form a loop;
the voltage division capacitor is connected with the tested object in parallel;
and the voltage division capacitor is connected with a second group of reactor groups in parallel.
2. The ultra-high voltage ultra-large capacitance test article alternating current withstand voltage test device of claim 1, which is characterized in that: the variable frequency power supply, the test transformer, the voltage division capacitor, the tested object, the first group of reactor groups and the second group of reactor groups are connected through anti-corona wires.
3. The ultra-high voltage ultra-large capacitance test article alternating current withstand voltage test device of claim 2, which is characterized in that: the first reactor group and the second reactor group are both provided with a plurality of reactors connected in parallel.
4. The ultra-high voltage ultra-large capacitance test article alternating current withstand voltage test device of claim 3, which is characterized in that: the reactor adopts a cake-type four-section series reactor.
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| CN202110223352.3A CN113049924A (en) | 2021-03-01 | 2021-03-01 | Extra-high voltage extra-large capacitance test article alternating current voltage withstand test device |
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| CN202110223352.3A CN113049924A (en) | 2021-03-01 | 2021-03-01 | Extra-high voltage extra-large capacitance test article alternating current voltage withstand test device |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010008304A (en) * | 2008-06-30 | 2010-01-14 | Toshiba Corp | Method and device for ac withstand voltage test |
| CN202285195U (en) * | 2011-11-10 | 2012-06-27 | 保定天威集团有限公司 | Partial-discharge-free high-voltage compensation reactor |
| CN203551730U (en) * | 2013-10-24 | 2014-04-16 | 国家电网公司 | A composite post insulator power-frequency voltage-withstand testing device |
| CN206134470U (en) * | 2016-11-21 | 2017-04-26 | 浙江舟山启明电力集团公司电力安装公司 | Light -duty series resonance reactor |
| CN108828412A (en) * | 2018-03-23 | 2018-11-16 | 国网甘肃省电力公司电力科学研究院 | A kind of super-pressure GIS speciality bus full voltage ac voltage withstanding experiment test device |
| CN109212389A (en) * | 2018-08-28 | 2019-01-15 | 中铁十二局集团有限公司 | A kind of large-capacity power equipment ac voltage withstanding test method |
| CN109521338A (en) * | 2018-11-27 | 2019-03-26 | 汪锐 | Frequency conversion parallel resonance pressure resistant test method based on Cascade boosting |
-
2021
- 2021-03-01 CN CN202110223352.3A patent/CN113049924A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010008304A (en) * | 2008-06-30 | 2010-01-14 | Toshiba Corp | Method and device for ac withstand voltage test |
| CN202285195U (en) * | 2011-11-10 | 2012-06-27 | 保定天威集团有限公司 | Partial-discharge-free high-voltage compensation reactor |
| CN203551730U (en) * | 2013-10-24 | 2014-04-16 | 国家电网公司 | A composite post insulator power-frequency voltage-withstand testing device |
| CN206134470U (en) * | 2016-11-21 | 2017-04-26 | 浙江舟山启明电力集团公司电力安装公司 | Light -duty series resonance reactor |
| CN108828412A (en) * | 2018-03-23 | 2018-11-16 | 国网甘肃省电力公司电力科学研究院 | A kind of super-pressure GIS speciality bus full voltage ac voltage withstanding experiment test device |
| CN109212389A (en) * | 2018-08-28 | 2019-01-15 | 中铁十二局集团有限公司 | A kind of large-capacity power equipment ac voltage withstanding test method |
| CN109521338A (en) * | 2018-11-27 | 2019-03-26 | 汪锐 | Frequency conversion parallel resonance pressure resistant test method based on Cascade boosting |
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