CN111913061A - Test system and method for loss test of large-capacity main transformer of power plant - Google Patents
Test system and method for loss test of large-capacity main transformer of power plant Download PDFInfo
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- CN111913061A CN111913061A CN202010642574.4A CN202010642574A CN111913061A CN 111913061 A CN111913061 A CN 111913061A CN 202010642574 A CN202010642574 A CN 202010642574A CN 111913061 A CN111913061 A CN 111913061A
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- 238000012360 testing method Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000005284 excitation Effects 0.000 claims abstract description 20
- 238000002955 isolation Methods 0.000 claims abstract description 18
- 238000010998 test method Methods 0.000 claims abstract description 8
- 238000005259 measurement Methods 0.000 claims description 28
- 238000005070 sampling Methods 0.000 claims description 15
- 230000009466 transformation Effects 0.000 claims description 6
- 238000010248 power generation Methods 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001131 transforming effect Effects 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/001—Measuring real or reactive component; Measuring apparent energy
- G01R21/002—Measuring real component
Abstract
The invention discloses a test system and a test method for a large-capacity main transformer loss test of a power plant.A field excitation system is connected with a generator, the output end of the generator is connected with one end of a main transformer high-voltage side isolation disconnecting link and one end of a main transformer high-voltage side grounding disconnecting link through a main transformer, the other end of the main transformer high-voltage side isolation disconnecting link is connected with a main transformer high-voltage side circuit breaker, and the other end of the main transformer high-voltage side grounding disconnecting link is grounded; the system and the method can accurately calculate the loss of the main transformer and can meet the requirements of the loss test of the existing main transformer.
Description
Technical Field
The invention belongs to the field of high-voltage tests of power equipment, and relates to a test system and a test method for a high-capacity main transformer loss test of a power plant.
Background
The main transformer is an electrical device for generating power by transforming power in a power plant, and has a very important position in a power plant system. In operation, the active power loss and the reactive power loss generated by the main transformer account for about 10% of the generated energy, and the main transformer loss is one of the main losses of the power plant. Therefore, the method reasonably calculates the loss electric quantity of the transformer, accurately calculates and analyzes the loss value of the transformer, and has very important significance for determining the annual loss characteristics and the calculation of the generated energy of the transformers with different voltage levels.
The main transformer loss is divided into iron loss and copper loss, the iron loss is also called no-load loss which is fixed loss, and the copper loss is also called load loss. At present, the loss of a main transformer is calculated by adopting an empirical numerical method. The method does not consider no-load loss and load loss, but adopts an empirical coefficient method, and generally takes 1.5% of the power consumption of a project as the loss of the transformer of the project. The method is simple and easy to calculate, but the calculation method is not accurate enough, and the calculation result has certain deviation. The transformer loss calculation formula method is respectively calculated in detail according to the no-load loss and the load loss of the transformer, and the final calculation result is the sum of the no-load loss and the load loss. The numerical value of no-load loss and load loss needs to be accurately obtained by a calculation formula method, but with the continuous development of large thermal power generating units in recent years, the capacity of a main transformer is higher and higher, and the conventional test equipment is difficult to meet the requirements of main transformer loss test tests.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a test system and a test method for testing the loss of a large-capacity main transformer of a power plant.
In order to achieve the purpose, the test system for the loss test of the large-capacity main transformer of the power plant comprises an excitation system, a generator, a main transformer high-voltage side isolation disconnecting link, a main transformer high-voltage side circuit breaker, a main transformer high-voltage side grounding disconnecting link, a measurement level voltage transformer, a measurement level current transformer and a wave recording analyzer;
the excitation system is connected with a generator, the output end of the generator is connected with one end of a main transformer high-voltage side isolation disconnecting link and one end of a main transformer high-voltage side grounding disconnecting link through a main transformer, the other end of the main transformer high-voltage side isolation disconnecting link is connected with a main transformer high-voltage side circuit breaker, and the other end of the main transformer high-voltage side grounding disconnecting link is grounded;
and a measurement-level voltage transformer and a measurement-level current transformer are arranged on a line between the generator and the main transformer, wherein the wave recording analyzer is connected with the measurement-level voltage transformer and the measurement-level current transformer.
The test method for the loss test of the large-capacity main transformer of the power plant comprises the following steps of:
1) switching a main transformer high-voltage side isolation disconnecting link, a main transformer high-voltage side circuit breaker and a main transformer high-voltage side grounding disconnecting link to disconnection positions, disconnecting control power supplies of the main transformer high-voltage side circuit breaker, the main transformer high-voltage side isolation disconnecting link and the main transformer high-voltage side grounding disconnecting link, putting into power generation and transformation group protection system related current and voltage protection and non-electric quantity protection, and adjusting the main transformer to a rated gear;
2) the method comprises the steps that a manual control mode of an excitation system is utilized to boost a generator, a measuring level voltage transformer, a measuring level current transformer and a main transformer, when the voltage of the low-voltage side of the main transformer reaches the rated voltage of the main transformer, boosting is stopped, three-phase voltage and current sampling values of the measuring level voltage transformer and the measuring level current transformer are recorded through a wave recording analyzer, the no-load loss of the main transformer is calculated according to the three-phase voltage and current sampling values, then the voltage of the generator is gradually reduced to zero, and finally the excitation system is withdrawn;
3) the method comprises the steps of closing a control power supply of a main transformer high-voltage side grounding knife switch, using the closed main transformer high-voltage side grounding knife switch as a main transformer high-voltage side short-circuit point, gradually increasing current of a generator, a measurement level voltage transformer, a measurement level current transformer and a main transformer by utilizing a manual control mode of an excitation system, stopping increasing current when the low-voltage side current of the main transformer reaches the rated current of the main transformer, recording three-phase voltage and current sampling values of the measurement level voltage transformer and the measurement level current transformer by a recording analyzer, calculating load loss of the main transformer according to the three-phase voltage and the current sampling values, gradually reducing the voltage of the generator to zero, withdrawing the excitation system, finally disconnecting the main transformer high-voltage side grounding knife switch, disconnecting the control power supply of the main transformer high-voltage side grounding knife switch, and completing a test of a large.
The wave recording analyzer is provided with the transformation ratio of a measuring-level voltage transformer and a measuring-level current transformer, the vector sum of three-phase active power is calculated by recording sampling values, the load loss of a main transformer is calculated, and the load loss P under test current is calculated according to the formula (1)1Correcting to load loss P under rated current working condition2；
Obtaining the no-load loss and the load loss of the main transformer, and calculating the loss delta P of the main transformer according to the formula (2), wherein,
ΔP＝Pk+KT×β2Pd (2)
wherein, PkIs the no-load loss of the main transformer, PdThe load fluctuation loss coefficient is KT, and the average load coefficient is beta.
The invention has the following beneficial effects:
according to the test system and the test method for the loss test of the large-capacity main transformer of the power plant, during specific operation, the generator is used as a test power supply for the loss test of the main transformer to perform no-load and short-circuit tests on the main transformer, the loss of the main transformer can be calculated only by acquiring corresponding data, no large-capacity test equipment is additionally provided, the loss of the main transformer can be accurately calculated, the test cost can be reduced, and the reliability of a calculation result can be improved.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is an excitation system, 2 is a generator, 3 is a main transformer, 4 is a main transformer high-voltage side isolation switch, 5 is a main transformer high-voltage side circuit breaker, 6 is a main transformer high-voltage side grounding switch, 7 is a measurement level voltage transformer, 8 is a measurement level current transformer, and 9 is a recording wave analyzer.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the test system for testing the loss of the large-capacity main transformer of the power plant comprises an excitation system 1, a generator 2, a main transformer 3, a main transformer high-voltage side isolation switch 4, a main transformer high-voltage side circuit breaker 5, a main transformer high-voltage side grounding switch 6, a measurement level voltage transformer 7, a measurement level current transformer 8 and a recording analyzer 9; the excitation system 1 is connected with a generator 2, the output end of the generator 2 is connected with one end of a main transformer high-voltage side isolation disconnecting link 4 and one end of a main transformer high-voltage side grounding disconnecting link 6 through a main transformer 3, the other end of the main transformer high-voltage side isolation disconnecting link 4 is connected with a main transformer high-voltage side circuit breaker 5, and the other end of the main transformer high-voltage side grounding disconnecting link 6 is grounded; a measuring-level voltage transformer 7 and a measuring-level current transformer 8 are arranged on a line between the generator 2 and the main transformer 3, wherein the wave recording analyzer 9 is connected with the measuring-level voltage transformer 7 and the measuring-level current transformer 8.
The measurement accuracy of the wave recording analyzer 9 is not lower than 0.5 level, and the measurement accuracy of the measurement level current transformer 8 and the measurement level voltage transformer 7 is not lower than 0.2 level.
The test method for the loss test of the large-capacity main transformer of the power plant comprises the following steps of:
1) switching a main transformer high-voltage side isolation switch 4, a main transformer high-voltage side circuit breaker 5 and a main transformer high-voltage side grounding switch 6 to disconnection positions, disconnecting control power supplies of the main transformer high-voltage side circuit breaker 5, the main transformer high-voltage side isolation switch 4 and the main transformer high-voltage side grounding switch 6, putting into power generation and transformation unit protection system related current and voltage protection and non-electric quantity protection, and adjusting a main transformer 3 to a rated gear;
2) the method comprises the steps that a manual control mode of an excitation system 1 is utilized to boost a generator 2, a measuring level voltage transformer 7, a measuring level current transformer 8 and a main transformer 3, when the voltage of the low-voltage side of the main transformer 3 reaches the rated voltage, boosting is stopped, three-phase voltage and current sampling values of the measuring level voltage transformer 7 and the measuring level current transformer 8 are recorded through a recording analyzer 9, the no-load loss of the main transformer 3 is calculated according to the three-phase voltage and current sampling values, then the voltage of the generator 2 is gradually reduced to zero, and finally the excitation system 1 is withdrawn;
3) the control power supply of the main transformer high-voltage side grounding knife switch 6 is closed, the main transformer high-voltage side grounding knife switch 6 is closed to be used as a main transformer 3 high-voltage side short-circuit point, the manual control mode of the excitation system 1 is utilized to carry out gradual current rise on the generator 2, the measuring stage voltage transformer 7, the measuring stage current transformer 8 and the main transformer 3, when the low-voltage side current of the main transformer 3 reaches the rated current, stopping the current rise, recording three-phase voltage and current sampling values of a measuring-stage voltage transformer 7 and a measuring-stage current transformer 8 through a wave recording analyzer 9, calculating the load loss of the main transformer 3 according to the three-phase voltage and current sampling values, and then gradually reducing the voltage of the generator 2 to zero, quitting the excitation system 1, finally disconnecting the main transformer high-voltage side grounding disconnecting link 6, and disconnecting the control power supply of the main transformer high-voltage side grounding disconnecting link 6 to complete the test of the large-capacity main transformer loss test of the power plant.
The wave recording analyzer 9 is provided with the transformation ratio of a measuring-level voltage transformer 7 and a measuring-level current transformer 8, the vector sum of three-phase active power is calculated by recording sampling values, and then the load loss of the main transformer 3 is calculated, if the load loss is large, the current transformer is small, and the current transformer is small, the current transformer is smallThe test current does not reach the rated current, and the load loss P under the test current is calculated according to the formula (1) because the load loss increases as the square of the ratio of the rated current to the test current1Correcting to load loss P under rated current working condition2；
Obtaining the no-load loss and the load loss of the main transformer 3, and calculating the loss delta P of the main transformer 3 according to the formula (2), wherein,
ΔP＝Pk+KT×β2Pd (2)
wherein, PkIs the no-load loss, P, of the main transformer 3dThe rated load loss of the main transformer 3 is represented by KT, which is a load fluctuation loss coefficient, and β, which is an average load coefficient.
In conclusion, the generator 2 is used as a test power supply for the loss test of the main transformer to perform no-load and short-circuit tests on the main transformer 3, the main transformer loss is obtained by acquiring data and calculating, the operation is convenient, the realization is easy, large-scale test equipment is not required, and the calculation result is accurate and reliable.
Claims (3)
1. A test system for testing the loss of a large-capacity main transformer of a power plant is characterized by comprising an excitation system (1), a generator (2), a main transformer (3), a main transformer high-voltage side isolation disconnecting link (4), a main transformer high-voltage side circuit breaker (5), a main transformer high-voltage side grounding disconnecting link (6), a measurement level voltage transformer (7), a measurement level current transformer (8) and a wave recording analyzer (9);
the excitation system (1) is connected with a generator (2), the output end of the generator (2) is connected with one end of a main transformer high-voltage side isolation disconnecting link (4) and one end of a main transformer high-voltage side grounding disconnecting link (6) through a main transformer (3), the other end of the main transformer high-voltage side isolation disconnecting link (4) is connected with a main transformer high-voltage side circuit breaker (5), and the other end of the main transformer high-voltage side grounding disconnecting link (6) is grounded;
a measurement-level voltage transformer (7) and a measurement-level current transformer (8) are arranged on a line between the generator (2) and the main transformer (3), wherein the wave recording analyzer (9) is connected with the measurement-level voltage transformer (7) and the measurement-level current transformer (8).
2. A test method for loss test of a large-capacity main transformer of a power plant is characterized in that a test system for loss test of the large-capacity main transformer of the power plant based on claim 1 comprises the following steps:
1) switching a main transformer high-voltage side isolation disconnecting link (4), a main transformer high-voltage side circuit breaker (5) and a main transformer high-voltage side grounding disconnecting link (6) to disconnection positions, disconnecting control power supplies of the main transformer high-voltage side circuit breaker (5), the main transformer high-voltage side isolation disconnecting link (4) and the main transformer high-voltage side grounding disconnecting link (6), putting into power generation and transformation unit protection system related current-voltage protection and non-electric quantity protection, and adjusting a main transformer (3) to a rated gear;
2) the method comprises the steps that a manual control mode of an excitation system (1) is utilized to boost a generator (2), a measurement level voltage transformer (7), a measurement level current transformer (8) and a main transformer (3), when the voltage of the low-voltage side of the main transformer (3) reaches the rated voltage of the main transformer, boosting is stopped, a recording analyzer (9) records the three-phase voltage and current sampling values of the measurement level voltage transformer (7) and the measurement level current transformer (8), the no-load loss of the main transformer (3) is calculated according to the three-phase voltage and current sampling values, then the voltage of the generator (2) is gradually reduced to zero, and finally the excitation system (1) is withdrawn;
3) a control power supply for closing a high-voltage side grounding knife switch (6) of a main transformer, wherein the closed high-voltage side grounding knife switch (6) of the main transformer is used as a high-voltage side short-circuit point of the main transformer (3), the generator (2), the measuring level voltage transformer (7), the measuring level current transformer (8) and the main transformer (3) are gradually subjected to up-flow by utilizing a manual control mode of an excitation system (1), when the low-voltage side current of the main transformer (3) reaches the rated current, the up-flow is stopped, three-phase voltage and current sampling values of the measuring level voltage transformer (7) and the measuring level current transformer (8) are recorded by a wave recording analyzer (9), the load loss of the main transformer (3) is calculated according to the three-phase voltage and current sampling values, then the voltage of the generator (2) is gradually reduced to zero, the excitation system (1) is withdrawn, and finally the high-voltage side grounding knife, and (3) disconnecting a control power supply of the high-voltage side grounding disconnecting link (6) of the main transformer to complete the test of the large-capacity main transformer loss test of the power plant.
3. The test method for the loss test of the main transformer with large capacity in the power plant according to the claim 2, characterized in that the recording analyzer (9) is provided with the transformation ratio of the measuring-level voltage transformer (7) and the measuring-level current transformer (8), the vector sum of the three-phase active power is calculated by recording the sampling values, the load loss of the main transformer (3) is calculated, and the load loss P under the test current is calculated according to the formula (1)1Correcting to load loss P under rated current working condition2；
Obtaining the no-load loss and the load loss of the main transformer (3), and calculating the loss delta P of the main transformer (3) according to the formula (2), wherein,
ΔP＝Pk+KT×β2Pd (2)
wherein, PkIs the no-load loss of the main transformer (3), PdThe rated load loss of the main transformer (3) is represented by KT which is a load fluctuation loss coefficient, and beta which is an average load coefficient.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112505543A (en) * | 2020-11-12 | 2021-03-16 | 华能国际电力股份有限公司井冈山电厂 | Large-scale generator iron loss detection system and method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4857856A (en) * | 1987-02-16 | 1989-08-15 | Era Patents Limited | Transformer testing |
| CN102435858A (en) * | 2011-09-15 | 2012-05-02 | 重庆大学 | Method and system for online measurement of short-circuit loss and open-circuit loss of transformer |
| CN105044479A (en) * | 2015-01-30 | 2015-11-11 | 国网河南省电力公司电力科学研究院 | Apparatus for large-scale oil-immersed transformer no-load and on-load comprehensive tests and method |
| CN205229358U (en) * | 2015-12-28 | 2016-05-11 | 保定天威保变电气股份有限公司 | Empty test circuit suitable for YNa0 transformer |
| CN106885959A (en) * | 2017-02-14 | 2017-06-23 | 山东中实易通集团有限公司 | The total firing test grounding switch of power plant electricity replaces the test method of short-circuiting copper bar |
| RU198361U1 (en) * | 2020-02-07 | 2020-07-02 | Алексей Николаевич Цицорин | Mobile installation for the diagnosis of power distribution transformers |
-
2020
- 2020-07-06 CN CN202010642574.4A patent/CN111913061A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4857856A (en) * | 1987-02-16 | 1989-08-15 | Era Patents Limited | Transformer testing |
| CN102435858A (en) * | 2011-09-15 | 2012-05-02 | 重庆大学 | Method and system for online measurement of short-circuit loss and open-circuit loss of transformer |
| CN105044479A (en) * | 2015-01-30 | 2015-11-11 | 国网河南省电力公司电力科学研究院 | Apparatus for large-scale oil-immersed transformer no-load and on-load comprehensive tests and method |
| CN205229358U (en) * | 2015-12-28 | 2016-05-11 | 保定天威保变电气股份有限公司 | Empty test circuit suitable for YNa0 transformer |
| CN106885959A (en) * | 2017-02-14 | 2017-06-23 | 山东中实易通集团有限公司 | The total firing test grounding switch of power plant electricity replaces the test method of short-circuiting copper bar |
| RU198361U1 (en) * | 2020-02-07 | 2020-07-02 | Алексей Николаевич Цицорин | Mobile installation for the diagnosis of power distribution transformers |
Non-Patent Citations (2)
| Title |
|---|
| 王琦等: "工频60Hz变压器采用50Hz试验电源进行空载和负载损耗测试的数据分析", 《变电压》 * |
| 白燕等: "节能评估中变压器损耗的简化计算方法研究", 《资源节约与环保》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112505543A (en) * | 2020-11-12 | 2021-03-16 | 华能国际电力股份有限公司井冈山电厂 | Large-scale generator iron loss detection system and method |
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Application publication date: 20201110 |