CN107102209B - Transformer substation grounding device parameter pay-off-free testing system - Google Patents
Transformer substation grounding device parameter pay-off-free testing system Download PDFInfo
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- CN107102209B CN107102209B CN201710293435.3A CN201710293435A CN107102209B CN 107102209 B CN107102209 B CN 107102209B CN 201710293435 A CN201710293435 A CN 201710293435A CN 107102209 B CN107102209 B CN 107102209B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/20—Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/06—Measuring leads; Measuring probes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
- G01R27/18—Measuring resistance to earth, i.e. line to ground
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention discloses a pay-off-free testing system for parameters of a grounding device of a transformer substation, which comprises a first phase line and a second phase line in a low-voltage outgoing line which is selected from the transformer substation and is not in operation frequently or can be quitted periodically, a current pole grounding disconnecting link which is arranged on the first phase line and is far away from the transformer substation to be tested, a voltage pole grounding disconnecting link which is arranged on the second phase line and is far away from the transformer substation to be tested, and a main testing device in the transformer substation for controlling the switching of each disconnecting link; according to the invention, a low-voltage outlet which is not frequently put into operation or can be periodically returned is selected, A, C two phases of the outlet are separately defined as a voltage line and a current line for testing, and the positions of a voltage pole and a current pole on A, C two phases of the low-voltage outlet are selected according to the size of a grounding device of the transformer substation to complete a testing loop. A large amount of labor work for the test is saved, the test result is not influenced by the quality of testers and external environment factors, and the accuracy of the test result is improved.
Description
Technical Field
The invention relates to the technical field of a standard normalized pay-off-free measurement and test system for electrical parameters of a grounding device of a transformer substation, in particular to a pay-off-free test system for parameters of a grounding device of a transformer substation.
Background
At present, a qualified grounding device plays an important role in the safe operation of a power system. When the system has a ground short circuit fault or is struck by lightning, the local potential of the ground grid is raised, and the safety of personnel and equipment is greatly threatened. The grounding device provides a common reference ground for various electrical equipment in the station, and when a power system fails, the fault current is quickly leaked into the ground, so that the maximum potential rise near a short-circuit point is restrained, and the safety of a human body and the equipment is ensured. And the operation and maintenance maintainers of the transformer substation develop the electrical parameter test of the grounding device of the transformer substation according to the maintenance period specified by the relevant regulations so as to judge the state of the grounding device of the transformer substation. When manual testing is carried out, a linear method paying-off mode and a pilot frequency current injection mode are generally adopted for testing. The method needs manual release and recovery of a test line with a certain length (generally 4-6 times of the maximum diagonal length of the tested ground network), and needs a large amount of manpower and time; the current pole and the voltage pole which are selected according to the habit of a tester during each test are different, so that the deviation of the measurement result is larger; and the test line is paved on the road surface and is easy to be broken or damaged due to rolling of vehicles, so that the test process is influenced or the safety of pedestrians is endangered.
Disclosure of Invention
The invention aims to provide a parameter pay-off-free testing system for a transformer substation grounding device, which can perform high-efficiency and standard test tests on electrical parameters of the transformer substation grounding device without being influenced by external factors, so that a large amount of labor work of the test tests is saved, the test results are not influenced by the quality of testees and external environment factors to the maximum extent, and the accuracy of the test results is improved.
The technical scheme adopted by the invention is as follows:
a transformer substation grounding device parameter pay-off-free testing system comprises a first phase line and a second phase line in a low-voltage outgoing line which is not normally put into operation or can be periodically withdrawn in a selected transformer substation, a current pole grounding disconnecting link 4 which is arranged on the first phase line and is far away from the transformer substation to be tested, a voltage pole grounding disconnecting link 3 which is arranged on the second phase line and is far away from the transformer substation to be tested, and a transformer substation internal testing main device 2 for controlling the switching of each disconnecting link; the transformer substation internal test main equipment 2 comprises a pilot frequency grounding impedance test device 5, a first 90-degree rotary wiring metal arm 6 and a second 90-degree rotary wiring metal arm 7, wherein the static ends of the first 90-degree rotary wiring metal arm 6 and the second 90-degree rotary wiring metal arm 7 are respectively connected with the input end and the output end of the pilot frequency grounding impedance test device 5, and the dynamic ends of the first 90-degree rotary wiring metal arm 6 and the second 90-degree rotary wiring metal arm 7 are respectively connected with a first phase line and a second phase line;
a control switch 13 is further arranged on the panel of the pilot frequency grounding impedance testing device 5 and used for controlling the switching of the first 90-degree rotary wiring metal arm 6 and the second 90-degree rotary wiring metal arm 7 with the first phase line and the second phase line respectively; the lower part of the pilot frequency grounding impedance testing device 5 is provided with two lead-out lead-in transformer substation grounding device leads 8, the two lead-out lead-in transformer substation grounding device leads 8 are welded on a transformer substation grounding device 9, and a testing device shell is grounded 10 on the side surface of the main testing equipment 2 in the transformer substation for ensuring the safety of the device in operation.
In order to prevent mutual coupling interference measurement caused by too close distance between a test voltage line and a test current line, the selected first phase line and the selected second phase line have the farthest phase limit distance, wherein the first phase line is an A-phase line and is an A-phase voltage line 11 for test, and the second phase line is a C-phase line and is a C-phase current line 12 for test.
The current electrode grounding disconnecting link 4 is arranged at a position which is 4-6 times of the length of the diagonal line of the grounding device of the transformer substation from the far end of the transformer substation to be tested; the distance between the voltage pole grounding disconnecting link 3 and the far end of the transformer substation to be tested is 0.618 times of the distance between the current pole grounding disconnecting link 4 and the far end of the transformer substation to be tested. The current pole grounding knife switch 4 and the voltage pole grounding knife switch 3 are required to be isolated from the outside through enclosing walls, so that electric shock accidents are avoided.
The test main equipment 2 in the transformer substation is arranged on the side, facing the transmission line, of the isolating switch 13 of the selected transmission line.
According to the invention, a certain low-voltage outgoing line which is not frequently put into operation or can be periodically returned is selected, A, C two phases of the outgoing line are separately defined as a voltage line and a current line for testing, the positions of a voltage pole and a current pole on A, C two phases of the low-voltage outgoing line are selected according to the size of a grounding device of the transformer substation, the low-voltage outgoing line is led into the ground through a grounding switch, and after a testing loop is completed, a pilot frequency grounding impedance testing device in the transformer substation is started to perform parameter testing on the grounding device of the transformer substation. The testing system can realize high-efficiency and standard test on the electrical parameters of the grounding device of the transformer substation without being influenced by external factors, saves a large amount of labor work of the test, furthest ensures that the test result is not influenced by the quality of testers and the external environment factors, and improves the accuracy of the test result.
Drawings
FIG. 1 is a schematic view of the structural state of the present invention in a non-test state;
FIG. 2 is a schematic view of the structure of the present invention in a test state;
fig. 3 is a schematic structural diagram of a test master device in a substation according to the present invention.
Detailed Description
As shown in fig. 1, 2 and 3, the present invention includes a first phase line and a second phase line in a low voltage outgoing line which is not frequently put into operation or can be periodically withdrawn from a selected substation, a current pole grounding disconnecting link 4 which is respectively arranged on the first phase line and is far away from the substation to be tested, a voltage pole grounding disconnecting link 3 which is arranged on the second phase line and is far away from the substation to be tested, and a main testing device 2 in the substation for controlling the switching of each disconnecting link; the transformer substation internal test main equipment 2 comprises a pilot frequency grounding impedance test device 5, a first 90-degree rotary wiring metal arm 6 and a second 90-degree rotary wiring metal arm 7, wherein the static ends of the first 90-degree rotary wiring metal arm 6 and the second 90-degree rotary wiring metal arm 7 are respectively connected with the input end and the output end of the pilot frequency grounding impedance test device 5, and the dynamic ends of the first 90-degree rotary wiring metal arm 6 and the second 90-degree rotary wiring metal arm 7 are respectively connected with a first phase line and a second phase line; first phase line be A looks circuit, and be voltage line 11 for the test, second phase line is C looks circuit, and is the current line 12 for the test, because the test line selects the two-phase of the farthest distance, can prevent like this that test voltage line and test current line distance from being too close to cause mutual coupling interference measurement
A control switch 1 is further arranged on a panel of the pilot frequency grounding impedance testing device 5 and used for controlling the switching of a first 90-degree rotary wiring metal arm 6 and a second 90-degree rotary wiring metal arm 7 with a first phase line and a second phase line respectively; the lower part of the pilot frequency grounding impedance testing device 5 is provided with two lead-out leads 8 of an access substation grounding device, the two lead-out leads 8 of the access substation are welded on a grounding device 9 of a substation, and the side surface of the main testing device 2 in the substation is provided with a shell grounding 10 of the testing device for ensuring the safety of the device during operation.
When the system is in a non-test state and the parameter pay-off-free test system of the transformer substation grounding device is not put into operation, a first 90-degree rotary wiring metal arm (power connection current line) 6 and a second 90-degree rotary wiring metal arm (power connection voltage line) 7 of the main test equipment 2 in the transformer substation are in a horizontal state, and the control switch 1 of the pilot frequency grounding impedance test device 5 is disconnected. The current pole grounding switch 4 and the voltage pole grounding switch 3 are also in an off state.
When the power transmission line is used, a power transmission line with proper length (the line length meets the requirement of testing distance of a grounding device of the transformer substation, namely the length of the line exceeds 4-6 times of the diagonal line length of the grounding device of the transformer substation), proper path (the path is in a straight line path as far as possible from the transformer substation), proper height (the power transmission line with a low voltage grade and a small distance from the ground is selected as far as possible), and flexible operation mode (not frequently put into operation or capable of being periodically withdrawn) is selected in the transformer substation. After the transmission line is determined, the phase a of the line is defined as a voltage line for testing (phase a) 11, the phase C is defined as a current line for testing (phase C) 12, and the main device 2 for testing in the substation is installed in the substation with the disconnector 13 of the transmission line facing the transmission line side.
The testing main device 2 in the transformer substation of the parameter pay-off-free testing system of the transformer substation grounding device is composed of a pilot frequency grounding impedance testing device 5, a first 90-degree rotary wiring metal arm (connected with an electric current line) 6 and a second 90-degree rotary wiring metal arm (connected with an electric voltage line) 7, wherein the first 90-degree rotary wiring metal arm (connected with the electric current line) 6 and the second 90-degree rotary wiring metal arm (connected with the electric voltage line) 7 act simultaneously, and can be connected with a voltage line (A phase) 11 and a current line (C phase) 12 for testing respectively. The pilot frequency grounding impedance test device 5 is powered by a 220V power supply wire.
Before testing the grounding device of the transformer substation, whether the line disconnecting switch 13 in the transformer substation of the system testing line is in a disconnected state or not should be confirmed, and meanwhile, the connection between the overhead ground wire and the tower of the testing line should be disconnected. And then, whether the current electrode grounding disconnecting link 4 and the voltage electrode grounding disconnecting link 3 are closed or not and whether a control switch of the pilot frequency grounding impedance testing device 5 is opened or not are determined.
When the system is in a test state, after confirming that a circuit isolating switch 13 in a transformer substation is in a disconnected state, putting in a transformer substation grounding device parameter pay-off-free test system, simultaneously rotating a 90-degree rotating wiring metal arm (power connection line) 6 and a 90-degree rotating wiring metal arm (power connection line) 7 of a main test device 2 in the transformer substation to be converted into a vertical state, switching on a control switch 1 of a pilot frequency grounding impedance test device 5, and then, putting in a current electrode grounding disconnecting link 4 and a voltage electrode grounding disconnecting link 3 and starting to measure.
Claims (4)
1. The utility model provides a unwrapping wire test system is exempted from to transformer substation's earthing device parameter which characterized in that: the transformer substation on-line grounding switch comprises a first phase line and a second phase line in a low-voltage outgoing line which is not frequently put into operation or can be periodically withdrawn from operation in a selected transformer substation, a current electrode grounding switch (4) which is arranged on the first phase line and is far away from the transformer substation to be tested, a voltage electrode grounding switch (3) which is arranged on the second phase line and is far away from the transformer substation to be tested, and a transformer substation internal testing main device (2) for controlling the switching of each switch; the transformer substation internal test main equipment (2) is composed of a pilot frequency grounding impedance test device (5), a first 90-degree rotary wiring metal arm (6) and a second 90-degree rotary wiring metal arm (7), wherein the static ends of the first 90-degree rotary wiring metal arm (6) and the second 90-degree rotary wiring metal arm (7) are respectively connected with the input end and the output end of the pilot frequency grounding impedance test device (5), and the dynamic ends of the first 90-degree rotary wiring metal arm (6) and the second 90-degree rotary wiring metal arm (7) are respectively connected with a first phase line and a second phase line;
a panel of the pilot frequency grounding impedance testing device (5) is also provided with a control switch (13) for controlling the switching of the first 90-degree rotary wiring metal arm (6) and the second 90-degree rotary wiring metal arm (7) with the first phase line and the second phase line respectively; the lower part of the pilot frequency grounding impedance testing device (5) is provided with two lead-in transformer substation grounding device leads (8) which are led out, the two lead-in transformer substation grounding device leads (8) which are led out are welded on a transformer substation grounding device (9), and a testing device shell is grounded (10) on the side face of the main testing equipment (2) in the transformer substation, so that the safety of the device during operation is ensured.
2. The substation grounding device parameter pay-off-free testing system of claim 1, wherein: in order to prevent mutual coupling interference measurement caused by too close distance between a test voltage line and a test current line, the selected first phase line and the selected second phase line have the farthest phase limit distance, wherein the first phase line is an A-phase line and is an A-phase voltage line (11) for test, and the second phase line is a C-phase line and is a C-phase current line (12) for test.
3. The substation grounding device parameter pay-off-free testing system of claim 1, wherein: the current electrode grounding disconnecting link (4) is arranged at a position which is 4-6 times of the length of the diagonal of the grounding device of the transformer substation from the far end of the transformer substation to be tested; the distance between the voltage pole grounding disconnecting link (3) and the far end of the transformer substation to be tested is 0.618 times that between the current pole grounding disconnecting link (4) and the far end of the transformer substation to be tested; the current pole grounding knife switch (4) and the voltage pole grounding knife switch (3) are required to be isolated from the outside through enclosing walls, so that electric shock accidents are avoided.
4. The substation grounding device parameter pay-off-free testing system of claim 3, wherein: the testing main equipment (2) in the transformer substation is arranged on the side, facing the transmission line, of the isolating switch (13) of the selected transmission line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710293435.3A CN107102209B (en) | 2017-04-28 | 2017-04-28 | Transformer substation grounding device parameter pay-off-free testing system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710293435.3A CN107102209B (en) | 2017-04-28 | 2017-04-28 | Transformer substation grounding device parameter pay-off-free testing system |
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| CN107102209A CN107102209A (en) | 2017-08-29 |
| CN107102209B true CN107102209B (en) | 2023-04-18 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104833883A (en) * | 2015-05-15 | 2015-08-12 | 云南电网有限责任公司电力科学研究院 | Ground grid test method based on 10-35kV short circuit grounding |
| WO2015117466A1 (en) * | 2014-02-07 | 2015-08-13 | 国网上海市电力公司 | Anti-interference integrated testing device for ultra-high voltage line parameters |
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2017
- 2017-04-28 CN CN201710293435.3A patent/CN107102209B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015117466A1 (en) * | 2014-02-07 | 2015-08-13 | 国网上海市电力公司 | Anti-interference integrated testing device for ultra-high voltage line parameters |
| CN104833883A (en) * | 2015-05-15 | 2015-08-12 | 云南电网有限责任公司电力科学研究院 | Ground grid test method based on 10-35kV short circuit grounding |
Non-Patent Citations (1)
| Title |
|---|
| 张义 ; 蔡汉生 ; 贾磊 ; 刘刚 ; 胡上茂 ; 施健 ; .带架空地线运行的变电站主接地网接地阻抗测量与分析.南方电网技术.2016,(09),全文. * |
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