CN111751681B - Network access detection test method for layered insulator - Google Patents
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- G01R31/1245—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 line insulators or spacers, e.g. ceramic overhead line cap insulators; of insulators in HV bushings
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses a network access detection test method of a layered insulator, wherein the test items comprise a dry state test and a rain state test, and the dry state test comprises a dry state direct current superposition direct current voltage withstand test, a dry state direct current superposition lightning voltage withstand test and a dry state direct current superposition operation voltage withstand test; the rain condition test comprises a rain condition direct current superposition direct current withstand voltage test, a rain condition direct current superposition lightning withstand voltage test and a rain condition direct current superposition operation withstand voltage test. The invention has the beneficial effects that: the high-voltage superposition test project of the layered insulator used by the extra-high voltage multi-terminal direct-current transmission system is determined, and the insulation tolerance condition of the insulator under various abnormal conditions can be comprehensively checked.
Description
Technical Field
The invention relates to the technical field of power equipment tests, in particular to a network access detection test method for a layered insulator.
Background
The ripple factor of a direct current waveform of a valve hall direct current side connecting line in a direct current transmission system needs to be reduced through a reactor, an outdoor type bridge arm reactor mode is adopted in the novel extra-high voltage multi-terminal direct current transmission system, and an ABC three-phase upper bridge arm and an ABC three-phase lower bridge arm converge on 400kV and 800kV buses after being leveled through the bridge arm reactors connected.
Current busbar and insulating support mode adopt layered support structure, and the first layer is 400kV generating line, the second floor is 800kV generating line, and the insulator adopts composite insulator, and in order to satisfy the bearing requirement, novel layered support structure is that two composite insulator of lower extreme are parallelly connected, insulator on the upper end, form layered insulator structure.
When the support mode is adopted, the insulator needs to bear direct current superposed operation voltage under the normal operation condition, and also needs to bear the superposed action of lightning overvoltage, operation overvoltage and direct current operation voltage under the abnormal condition, and also needs to bear the superposed action of the lightning overvoltage, the operation overvoltage and the direct current operation voltage under the raining state under the extreme abnormal condition.
At present, a complete network access detection test method and a complete network access detection test flow aiming at the type of insulator do not exist, so an examination method before network access is urgently needed to determine that the insulator has good tolerance characteristics and commissioning conditions.
Disclosure of Invention
Aiming at the problems, the invention provides a network access detection test method of a layered insulator, which mainly solves the problems of the background art.
In order to solve the technical problems, the technical scheme of the invention is as follows:
A network access detection test method for a layered insulator comprises a dry state test and a rain state test,
the dry state test comprises a dry state direct current superposition direct current voltage withstand test, a dry state direct current superposition lightning voltage withstand test and a dry state direct current superposition operation voltage withstand test; the rain condition test comprises a rain condition direct current superposition direct current withstand voltage test, a rain condition direct current superposition lightning withstand voltage test and a rain condition direct current superposition operation withstand voltage test;
and (3) firstly carrying out a dry state test on the layered insulator to be tested, then carrying out a rain state test, judging that the layered insulator passes the test if the layered insulators after all the tests do not have the breakdown phenomenon, and judging that the layered insulator does not pass the test if the layered insulators after all the tests do not have the breakdown phenomenon.
In some embodiments, a dry-state direct-current superimposed direct-current voltage withstand test adopts two direct-current high-voltage generators with different voltage levels and two sets of water resistance protection devices, wherein the direct-current high-voltage generator with a higher voltage level is defined as Z1, the direct-current high-voltage generator with a lower voltage level is defined as Z2, the direct-current high-voltage generator Z1 is connected to the top end of the layered insulator through a top water resistance protection device, the voltage withstand value of the direct-current high-voltage generator Z1 is set as Ud1, the direct-current high-voltage generator Z2 is connected to the middle part of the layered insulator through a middle water resistance protection device, the voltage withstand value of the direct-current high-voltage generator Z2 is set as Ud2, and Ud1 is set as 2Ud 2; the direct-current high-voltage generator Z1, the direct-current high-voltage generator Z2 and the layered insulator are grounded together;
The voltage pressurizing process comprises the following steps: 1) starting a direct-current high-voltage generator Z2 without boosting; 2) starting a direct-current high-voltage generator Z1, and gradually increasing the voltage to Ud 2; 3) stepping up the direct current high voltage generator Z2 to Ud 2; 4) then the voltage of the direct current high voltage generator Z1 is gradually increased to Ud1, and the voltage is resisted for 30 min; 5) after the voltage resistance is finished, firstly reducing the voltage of the direct current high-voltage generator Z1 to Ud2, then reducing the voltage of the direct current high-voltage generator Z2 to 0, finally reducing the voltage of the direct current high-voltage generator Z1 to 0, and finally disconnecting the power supplies of the two sets of direct current high-voltage generators to finish grounding.
In some embodiments, the dry-state direct-current superposition lightning voltage-withstand test and the dry-state direct-current superposition operation voltage-withstand test both adopt an impulse voltage generator, a direct-current high-voltage generator, a silicon stack protection device and a middle water resistance protection device, the impulse voltage generator is connected to the top end of the layered insulator, the test voltage of the impulse voltage generator is set to Uc, the direct-current high-voltage generator is connected with one end of the middle water resistance protection device, the other end of the middle water resistance protection device is connected to the anode of the silicon stack protection device, the cathode of the silicon stack protection device is connected to the middle of the layered insulator, and the test voltage of the direct-current high-voltage generator is set to Ud;
The voltage pressurizing process comprises the following steps: 1) starting a direct-current high-voltage generator, and gradually increasing the voltage to Ud; 2) starting the impulse voltage generator, completing 1 time of 60% Uc impulse test, observing the state of the direct current high voltage generator, and immediately stopping the test if the direct current high voltage generator is abnormal; 3) if no abnormity exists, the impact test under the Uc voltage is completed for 3 times; 4) after the test is finished, the impulse voltage generator is grounded, the voltage of the direct current high voltage generator is reduced to 0 from Ud, the power supply is disconnected, and grounding is finished.
In some embodiments, the rain condition dc superimposed dc voltage withstand test, the rain condition dc superimposed lightning voltage withstand test and the rain condition dc superimposed operation voltage withstand test respectively correspond to the dry condition dc superimposed dc voltage withstand test, the dry condition dc superimposed lightning voltage withstand test and the dry condition dc superimposed operation voltage withstand test, and the difference is that the three tests in the rain condition additionally adopt a rain device to simulate real rainfall.
In some embodiments, the rain device is used for simulating rainfall and rainfall angle, firstly adjusting the position of the layered insulator, the rainfall and the rainfall angle according to requirements, respectively measuring the average vertical rainfall in unit time and the average horizontal rainfall in unit time at the upper, middle and lower positions of the layered insulator, and completing adjustment when the average vertical rainfall in unit time and the average horizontal rainfall in unit time at the three measuring positions meet the requirements; then, pre-spraying for 15min by using pure water meeting the conductivity requirement, then keeping the rain state, and respectively using voltage pressurization flows in a dry state direct current superposition direct current withstand voltage test, a dry state direct current superposition lightning withstand voltage test and a dry state direct current superposition operation withstand voltage test; and after the withstand voltage test is finished, the power supply is cut off, the rain stops after the voltage returns to zero.
The invention has the beneficial effects that: the high-voltage superposition test project of the layered insulator used by the extra-high voltage multi-terminal direct-current transmission system is determined, and the insulation tolerance condition of the insulator under various abnormal conditions can be comprehensively checked.
Drawings
FIG. 1 is a schematic diagram of a dry DC-DC superimposed DC withstand voltage test in an embodiment of the present invention;
FIG. 2 is a schematic diagram of a dry state DC superposition lightning withstand voltage test and a dry state DC superposition operation withstand voltage test in an embodiment of the present invention;
FIG. 3 is a schematic diagram of a rain condition test in an embodiment of the invention;
FIG. 4 is a voltage pressurization flowchart of the dry state DC-DC superposition DC withstand voltage test in the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the following detailed description of the present invention is provided with reference to the accompanying drawings and detailed description. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the relevant aspects of the present invention are shown in the drawings.
The embodiment provides a network access detection test method of a layered insulator, the test items comprise a dry state test and a rain state test,
The dry state test comprises a dry state direct current superposition direct current withstand voltage test, a dry state direct current superposition lightning withstand voltage test and a dry state direct current superposition operation withstand voltage test; the rain condition test comprises a rain condition direct current superposition direct current voltage withstand test, a rain condition direct current superposition lightning voltage withstand test and a rain condition direct current superposition operation voltage withstand test; six basic tests are performed.
And (3) carrying out a dry state test on the layered insulator to be tested, then carrying out a rain state test, judging that the layered insulator passes the test if the layered insulators after all the tests have no breakdown phenomenon, and judging that the layered insulator does not pass the test if the layered insulators after all the tests have the breakdown phenomenon.
1) The invention defines the high-voltage superposition test project of the layered insulator used by the extra-high voltage multi-terminal direct-current transmission system, and can comprehensively check the insulation tolerance condition of the insulator under various abnormal conditions.
2) The wiring method and the test flow of the project test provided by the invention comprehensively consider various factors such as the checking capability of the test, the safety of the test equipment under the superposed voltage and the like.
3) The invention provides a rain operation process, which is suitable for a rain test of the insulator.
As shown in fig. 1, the dry-state dc-superimposed dc voltage withstand test employs two dc high-voltage generators with different voltage levels and two sets of water resistance protection devices, wherein the dc high-voltage generator with a higher voltage level is defined as Z1, the dc high-voltage generator with a lower voltage level is defined as Z2, the dc high-voltage generator Z1 is connected to the top end of the layered insulator 4 through the top water resistance protection device 3, the voltage withstand value of the dc high-voltage generator Z1 is set as Ud1, the dc high-voltage generator Z2 is connected to the middle part of the layered insulator 4 through the middle water resistance protection device 5, the voltage withstand value of the dc high-voltage generator Z2 is set as Ud2, and Ud1 is set as 2Ud 2; the direct-current high-voltage generator Z1, the direct-current high-voltage generator Z2 and the layered insulator are grounded together; the rated voltage of the top of the layered insulator 4 is 800kV, the rated voltage of the middle of the layered insulator is 400kV, the direct-current high-voltage generator Z1 adopts a 2000kV direct-current high-voltage generator, the direct-current high-voltage generator Z2 adopts an 800kV direct-current high-voltage generator for layered pressurization, and the withstand voltage is set to be 1.5 times of the rated voltage. The 2000kV DC high-voltage generator outputs 1200kV DC voltage which is connected to the top of the layered insulator through a top water resistance protection device 3 of 80M omega, and the 800kV DC high-voltage generator outputs 600kV which is connected to the middle of the layered insulator through a middle water resistance protection device 5 of 40M omega.
As shown in fig. 4, the voltage applying process includes: 1) starting a direct-current high-voltage generator Z2 without boosting; 2) starting a direct-current high-voltage generator Z1, and gradually increasing the voltage to Ud 2; 3) stepping up the direct current high voltage generator Z2 to Ud 2; 4) then the voltage of the direct current high voltage generator Z1 is gradually increased to Ud1, and the voltage is resisted for 30 min; 5) after the voltage resistance is finished, firstly reducing the voltage of the direct current high-voltage generator Z1 to Ud2, then reducing the voltage of the direct current high-voltage generator Z2 to 0, finally reducing the voltage of the direct current high-voltage generator Z1 to 0, and finally disconnecting the power supplies of the two sets of direct current high-voltage generators to finish grounding.
As shown in fig. 2, both the dry-state direct-current superposition lightning voltage-withstand test and the dry-state direct-current superposition operation voltage-withstand test adopt an impulse voltage generator 6, a direct-current high-voltage generator 7, a silicon stack protection device 8 and a middle water resistance protection device 5, the impulse voltage generator 6 is connected to the top end of the layered insulator 4, the test voltage of the impulse voltage generator 6 is set to Uc, the direct-current high-voltage generator 7 is connected with one end of the middle water resistance protection device 5, the other end of the middle water resistance protection device 5 is connected to the anode of the silicon stack protection device 8, the cathode of the silicon stack protection device 8 is connected to the middle of the layered insulator 4, and the test voltage of the direct-current high-voltage generator 7 is set to Ud;
The voltage pressurizing process comprises the following steps: 1) starting the direct-current high-voltage generator 7, and gradually increasing the voltage to Ud; 2) starting the impulse voltage generator 6, completing 1 time of 60% Uc impulse test, observing the state of the direct current high voltage generator 7, and immediately stopping the test if the state is abnormal; 3) if no abnormity exists, the impact test under the Uc voltage is completed for 3 times; 4) after the test is finished, the impulse voltage generator 6 is grounded, the voltage of the direct current high voltage generator 7 is reduced to 0 from Ud, the power supply is disconnected, and grounding is finished. Wherein, the rated voltage of the top of the layered insulator 4 is 800kV, the rated voltage of the middle part is 400kV, the impulse voltage generator 6 adopts 3200kV impulse voltage generator, and the direct current high voltage generator 7 adopts 800kV direct current high voltage generator. During a dry state direct current superposition lightning withstand voltage test, 1950kV lightning impulse voltage output by a 3200kV impulse voltage generator is directly applied to the top of a layered insulator 4, 400kV is output by an 800kV direct current high-voltage generator, and the generator is connected to the middle of the layered insulator through a silicon stack and a middle water resistance protection device 5 of 40M omega; when the dry state direct current superposition operation withstand voltage test, the 3200kV impulse voltage generator outputs 1650kV operation impulse voltage to directly hit the top of the insulator, the 800kV direct current high-voltage generator outputs 400kV, and the middle part of the layered insulator is connected with the middle part of the layered insulator through a silicon stack and a middle water resistance protection device 5 of 40M omega.
The direct current superposition direct current voltage withstand test under the rain condition, the direct current superposition lightning voltage withstand test under the rain condition and the direct current superposition operation voltage withstand test under the rain condition respectively correspond to a dry direct current superposition direct current voltage withstand test, a dry direct current superposition lightning voltage withstand test and a dry direct current superposition operation voltage withstand test, and the difference lies in that a rain device is additionally adopted to simulate real rainfall in the three tests under the rain condition. The rain device can adopt the existing insulator rain test device, such as the insulator rain test device disclosed in the Chinese patent application CN 107621598A.
As shown in fig. 3, the rain device is used for simulating rainfall and rainfall angle, firstly adjusting the position of the layered insulator, the rainfall and the rainfall angle according to requirements, respectively measuring the average vertical rainfall and the average horizontal rainfall in unit time at the upper, middle and lower positions of the layered insulator, and completing adjustment when the average vertical rainfall and the average horizontal rainfall in unit time at the three measuring positions meet the requirements; then, pre-spraying for 15min by using pure water meeting the conductivity requirement, then keeping the rain state, and respectively using voltage pressurization flows in a dry state direct current superposition direct current withstand voltage test, a dry state direct current superposition lightning withstand voltage test and a dry state direct current superposition operation withstand voltage test; and after the withstand voltage test is finished, the power supply is cut off, the rain stops after the voltage returns to zero. The resistivity of pure water was 100. omega. m (20 ℃ C. value).
The insulator examined by the test is applied to a transformer substation in the Guangdong coastal region with high temperature, high salt and storm typhoon invasion all the year round, the insulator external flash fault rate of the transformer substation is reduced from 7 times to 1 time, and the accident rate is obviously reduced.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention accordingly. All equivalent changes and modifications made according to the spirit of the present disclosure should be covered within the scope of the present disclosure.
Claims (4)
1. A network access detection test method of a layered insulator is characterized in that test items comprise a dry state test and a rain state test,
the dry state test comprises a dry state direct current superposition direct current voltage withstand test, a dry state direct current superposition lightning voltage withstand test and a dry state direct current superposition operation voltage withstand test; the rain condition test comprises a rain condition direct current superposition direct current withstand voltage test, a rain condition direct current superposition lightning withstand voltage test and a rain condition direct current superposition operation withstand voltage test;
the dry state test is firstly carried out on the layered insulator to be tested, then the rain state test is carried out, if the layered insulator after all the tests has no breakdown phenomenon, the layered insulator is judged to pass the test, and if the layered insulator after all the tests has the breakdown phenomenon, the layered insulator is judged not to pass the test;
The dry state direct current superposition direct current voltage withstand test adopts two direct current high-voltage generators with different voltage grades and two sets of water resistance protection devices, wherein the direct current high-voltage generator with a higher voltage grade is defined as Z1, the direct current high-voltage generator with a lower voltage grade is defined as Z2, the direct current high-voltage generator Z1 is connected to the top end of the layered insulator through a top water resistance protection device, the voltage withstand value of the direct current high-voltage generator Z1 is set as Ud1, the direct current high-voltage generator Z2 is connected to the middle part of the layered insulator through a middle water resistance protection device, the voltage withstand value of the direct current high-voltage generator Z2 is set as Ud2, and Ud1 is set as 2Ud 2; the direct-current high-voltage generator Z1, the direct-current high-voltage generator Z2 and the layered insulator are grounded together;
the voltage pressurizing process comprises the following steps: 1) starting the direct-current high-voltage generator Z2 without boosting; 2) starting the direct-current high-voltage generator Z1 to gradually increase the voltage to Ud 2; 3) stepping up the direct current high voltage generator Z2 to Ud 2; 4) then the direct current high voltage generator Z1 is gradually increased to Ud1, and the voltage is resisted for 30 min; 5) after the voltage resistance is finished, firstly reducing the voltage of the direct current high voltage generator Z1 to Ud2, then reducing the voltage of the direct current high voltage generator Z2 to 0, finally reducing the voltage of the direct current high voltage generator Z1 to 0, and finally disconnecting the power supplies of the two sets of direct current high voltage generators to finish grounding.
2. The method as claimed in claim 1, wherein the dry-state dc-superposition lightning voltage withstand test and the dry-state dc-superposition operation voltage withstand test both use an impulse voltage generator, a dc high voltage generator, a silicon stack protection device and a middle water resistance protection device, the impulse voltage generator is connected to the top end of the layered insulator, the test voltage of the impulse voltage generator is set to Uc, the dc high voltage generator is connected to one end of the middle water resistance protection device, the other end of the middle water resistance protection device is connected to the anode of the silicon stack protection device, the cathode of the silicon stack protection device is connected to the middle part of the layered insulator, and the test voltage of the dc high voltage generator is set to Ud;
the voltage pressurizing process comprises the following steps: 1) starting a direct-current high-voltage generator, and gradually increasing the voltage to Ud; 2) starting the impulse voltage generator, completing 1 time of 60% Uc impulse test, observing the state of the direct current high voltage generator, and immediately stopping the test if the direct current high voltage generator is abnormal; 3) if no abnormity exists, the impact test under the Uc voltage is completed for 3 times; 4) after the test is finished, the impulse voltage generator is grounded, the voltage of the direct current high voltage generator is reduced to 0 from Ud, the power supply is disconnected, and grounding is finished.
3. The networking test method for a layered insulator according to claim 2, wherein the rain condition dc superimposed dc withstand voltage test, the rain condition dc superimposed lightning withstand voltage test, and the rain condition dc superimposed operation withstand voltage test correspond to the dry condition dc superimposed dc withstand voltage test, the dry condition dc superimposed lightning withstand voltage test, and the dry condition dc superimposed operation withstand voltage test, respectively, and the difference is that a rain device is additionally used to simulate real rainfall in the three tests of the rain condition.
4. The network-entry detection test method for the layered insulator according to claim 3, wherein the rain device is used for simulating rainfall and rainfall angle, the position, rainfall and rainfall angle of the layered insulator are adjusted according to requirements, the average vertical rainfall and the average horizontal rainfall per unit time are measured at the upper, middle and lower positions of the layered insulator respectively, and when the average vertical rainfall per unit time and the average horizontal rainfall per unit time at the three measurement positions meet the requirements, the adjustment is completed; then, pre-spraying for 15min by using pure water meeting the conductivity requirement, then keeping the rain state, and respectively using the voltage pressurization flows in the dry state direct current superposition direct current voltage withstand test, the dry state direct current superposition lightning voltage withstand test and the dry state direct current superposition operation voltage withstand test; and after the withstand voltage test is finished, the power supply is cut off, the rain stops after the voltage returns to zero.
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