CN108416462B - Method and system for optimizing preventive test period of wind power plant booster station and 35kV current collection line equipment - Google Patents
Method and system for optimizing preventive test period of wind power plant booster station and 35kV current collection line equipment Download PDFInfo
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Abstract
The invention provides a preventive test period optimization method for a wind power plant booster station and 35kV current collection line equipment, which comprises the following steps: (1) the method comprises the steps of optimizing a preventive test period of a wind power plant booster station, wherein the preventive test period comprises an arrester with a voltage grade of 35kv, a current transformer, a voltage transformer, a vacuum circuit breaker and an overvoltage protector in the wind power plant booster station, a transformer with a voltage grade of 110kv or above, the current transformer, a capacitor voltage transformer, an SF6 circuit breaker, an outdoor high-voltage isolating switch and the arrester, optimizing ground network grounding resistance of the booster station, an in-station network conduction test and an SF6 gas leakage test; (2) the method comprises the steps of carrying out preventive test period optimization on 35kV current collection line equipment, wherein the preventive test period optimization comprises insulation resistance and direct current resistance tests, insulation oil chromatography tests, transformation ratio tests and alternating current withstand voltage tests of box transformers, determining the test period of a 35kV lightning arrester, carrying out infrared temperature measurement tests and power failure tests on the lightning arrester, carrying out infrared thermal imaging detection, and carrying out insulator detection and ground network ground resistance test period optimization. A corresponding optimization system is also provided.
Description
Technical Field
The invention belongs to the field of preventive tests of power equipment, and particularly relates to a method and a system for optimizing preventive test periods of a wind power plant booster station and 35kV current collection line equipment.
Background
With the high importance of the state on the new energy industry, more and more wind power plants are put into operation in the northwest region in recent years due to the unique advantage of wind energy resources. Generally, a 100MW or 50MW wind power plant needs to be matched with a 110kV transformer substation, the installed capacity of an area where a large-scale new energy enterprise is located exceeds million kilowatts, the number of the 110kV transformer substations exceeds more than 10, once main equipment of the transformer substation fails, the whole power failure is caused, and therefore the preventive test of the transformer substation and the annual scheduled inspection of a wind power generation unit are improved to the same important position by an owner. Meanwhile, in order to timely find hidden dangers in the operation equipment of the 35kv current collecting line, prevent the equipment from being damaged and ensure the safe operation of the equipment, special preventive test optimization measures are also necessary according to the operation state of the 35kv current collecting line and in combination with the state maintenance requirements. However, in the prior art, researches on a preventive test periodic optimization method and a system for a wind power plant booster station and a 35kV collector line device are not available, and only some conventional preventive test methods are unable to judge the running risk of the device, so that the preventive test cannot be periodically optimized.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the defects of the prior art are overcome, the preventive test period optimization method and the preventive test period optimization system for the booster station and the 35kV current collection line equipment in the wind power plant are provided, and the preventive test is performed on the booster station and the 35kV current collection line equipment with specific and important parts, so that the running risk of each part of the equipment is accurately evaluated, the hidden danger in the running equipment is timely found, the equipment is prevented from being damaged, the safe running of the equipment is ensured, and the power failure accident of the whole plant is prevented.
Therefore, the invention aims to provide a preventive test period optimization method for a wind power plant booster station and 35kV collecting line equipment, which comprises the following steps:
(1) the method comprises the steps of optimizing a preventive test period of a wind power plant booster station, wherein the preventive test period comprises an arrester with a voltage grade of 35kv, a current transformer, a voltage transformer, a vacuum circuit breaker and an overvoltage protector in the wind power plant booster station, a transformer with a voltage grade of 110kv or above, the current transformer, a capacitor voltage transformer, an SF6 circuit breaker, an outdoor high-voltage isolating switch and the arrester, optimizing ground network grounding resistance of the booster station, an in-station network conduction test and an SF6 gas leakage test;
(2) the method comprises the steps of carrying out preventive test period optimization on 35kV current collection line equipment, wherein the preventive test period optimization comprises insulation resistance and direct current resistance tests, insulation oil chromatography tests, transformation ratio tests and alternating current withstand voltage tests of box transformers, determining the test period of a 35kV lightning arrester, carrying out infrared temperature measurement tests and power failure tests on the lightning arrester, carrying out infrared thermal imaging detection, and carrying out insulator detection and ground network ground resistance test period optimization.
Preferably, the stroke electric field booster station preventive test optimization method in the step (1) comprises the following steps:
(1-1) carrying out transverse and longitudinal comparison on running states of lightning arresters, current transformers, voltage transformers, vacuum circuit breakers and overvoltage protectors with 35kv voltage levels in a booster station according to routine test data of the same manufacturer in the same batch and state under similar running and detection conditions, searching equipment degradation rules and summarizing experience, and optimizing a preventive test period;
(1-2) comprehensively analyzing the health condition of equipment by combining equipment inspection data and infrared thermal imaging monitoring data of a transformer, a current transformer, a capacitor voltage transformer, an SF6 circuit breaker, an outdoor high-voltage isolating switch and a lightning arrester with the voltage level of 110kv or above, and detecting electrical equipment with poor working conditions;
(1-3) testing the ground resistance of the large ground network of the booster station once every 6 years, and testing the conduction of the ground network of the booster station once every 3 years;
(1-4) replacing a lightning arrester with 110kv or more in a power failure test electrification test;
(1-5) under the condition of equipment electrification, an infrared thermometer is used for carrying out SF6 gas leak detection test.
Preferably, the optimization principle of the wind farm booster station preventive test in the step (1) includes:
(1) comprehensively analyzing and judging the equipment inspection record, defect summary and routine test, online detection, equipment family defects, poor operation conditions and other information of the booster station with the voltage level of 110kv or above;
(2) for the power failure routine test, the standard period of the equipment with the voltage of 110kv and above is 3 years; the standard period of the equipment of 35kv and below is 4 years, the equipment of a plurality of voltage classes in a transformer substation is considered, in order to avoid repeated power failure conditions caused by different standard periods of power failure routine tests, when the equipment of a high voltage class in the same transformer substation reaches the power failure routine test period to be tested, the equipment of a low voltage class is arranged to be subjected to routine tests as simultaneously as possible, and for the condition that no abnormity possibly endangering the safe operation of the equipment is found in routing inspection, the state of the electrified monitoring equipment is good, the handing-over test result of the previous routine test and the previous routine test result is not obviously different, any family defect possibly endangering the safe operation of the equipment is absent, the equipment is not subjected to serious bad working conditions since the previous routine test, the preventive test can be carried out for 1 year;
(3) for a device to meet one of the following conditions, preventive trials need to be scheduled in advance or as soon as possible: the equipment finds abnormality in the routing inspection, the abnormality can be caused by serious quality hidden danger, the state of the equipment is poor through live detection and display, the conventional routine test has an obvious trend of developing towards an attention value or a warning value or is close to the attention value or the warning value, the equipment has familial defects and is subjected to more serious poor working conditions, and whether the equipment state is substantially damaged or not can not be determined without the test;
(4) if the equipment is preliminarily judged to have risks in continuous operation, whether the equipment is expired or not, a preventive test plan is adjusted, the test period is shortened, and the equipment is quitted to operate as soon as possible to perform the test in serious conditions.
Preferably, the preventive test optimization measure of the 35kv current collection line equipment in the step (2):
(2-1) for the box transformer with family defects, all test items are performed 1 time per year, in other cases, each line is subjected to spot inspection 30% per year, the general test is completed in a period of 3 years, and an insulation resistance and direct current resistance test and an insulation oil chromatography test are performed; under the similar operation and detection conditions, routine test data, historical oil chromatography test data and operation states of the box transformer in the same batch and in the same state of the same manufacturer are transversely and longitudinally compared, the rule of equipment and the experience are searched, and the preventive test period is further optimized;
(2-2) carrying out a transformation ratio test and an alternating current withstand voltage test of the box-type transformer, the alternating current withstand voltage test belonging to the destructive test being selectively carried out according to the operation state of the equipment, the alternating current withstand voltage test being carried out only when a winding problem is suspected;
(2-3) determining the wind field location with a 35kv lightning arrester test period of 1 year and a lightning arrester test period of 3 years according to the running state of the wind power plant line and the frequency analysis of lightning stroke occurrence, focusing on the overhead line lightning arrester of the iron tower, predicting the defect of aging or internal moisture of a resistor disc by analyzing infrared temperature measurement data and routine test data of the lightning arrester, adjusting the test period in time for the lightning arrester with poor running condition, further judging the health state of the lightning arrester through a power failure test, eliminating the influence of corona and leakage current of an external insulation surface in the test process, ensuring the accuracy of test data, timely replacing the lightning arrester with test data exceeding the regulation requirement, and summarizing the deterioration rule;
(2-4) carrying out infrared thermal imaging detection, adjusting the test period of each wind power plant at any time according to the running state of the cable, carrying out a voltage-withstanding test after replacing the cable head, and detecting whether the cable has phenomena of excessive bending, excessive stretching, external damage, rainwater soaking and poor grounding in the routing inspection process;
(2-5) if the zero value detection rate of a certain batch of suspension insulators is obviously higher than an operation experience value, shortening a zero value detection period of the batch of insulators as appropriate, detecting the insulators with lightning stroke traces, replacing the zero value or low value insulators, performing insulation resistance test on two tower insulators close to a line tower subjected to lightning stroke, recording, and searching for an insulator degradation rule;
(2-6) carrying out once ground network grounding resistance test on the fan and box transformer substation ground network every year, adopting a wheel test method, namely detecting the grounding resistance of a part of line iron towers and towers every year, completing general test in 5 years, and transforming unqualified iron towers and tower ground networks.
Preferably, the optimization principle of the preventive test of the 35kv current collection line equipment in the step (2) comprises:
(1) comprehensively analyzing and judging the information based on the inspection record, defect summary and routine test, on-line detection, equipment family defects, poor operation conditions and the like of 35kv current collection line equipment;
(2) for the power failure routine test, the reference period of the equipment with the voltage of 35kv and below is 4 years, and for the equipment which is not found to be abnormal in inspection and possibly endangering the safe operation of the equipment, the state of the charged monitoring equipment is good, the result of the last routine test is not obviously different from the result of the last routine handover test, any family defect possibly endangering the safe operation of the equipment is absent, and the equipment is not subjected to serious adverse working conditions since the last routine test, the preventive test can be carried out for 1 year;
(3) for a device to meet one of the following conditions, preventive trials need to be scheduled in advance or as soon as possible: the equipment finds abnormality in the routing inspection, the abnormality can be caused by serious quality hidden danger, the state of the equipment is poor through live detection and display, the conventional routine test has an obvious trend of developing towards an attention value or a warning value or is close to the attention value or the warning value, the equipment has familial defects and is subjected to more serious poor working conditions, and whether the equipment state is substantially damaged or not can not be determined without the test;
(4) if the equipment is preliminarily judged to have risks in continuous operation, whether the equipment is expired or not, a preventive test plan is adjusted, the test period is shortened, and the equipment is quitted to operate as soon as possible to perform the test in serious conditions.
The invention also aims to provide a preventive test period optimization system for the booster station of the wind power plant and the 35kV current collection line equipment, which comprises the following subsystems:
(1) the preventive test period optimization subsystem of the wind power station booster station comprises: the device comprises an arrester detector, a current transformer detector, a voltage transformer detector, a vacuum circuit breaker detector and an overvoltage protector detector with the voltage grade of 35kv in a wind power station booster station, a transformer live detector, a current transformer detector, a capacitance voltage transformer detector, an SF6 circuit breaker detector, an outdoor high-voltage isolating switch detector, an arrester detector with the voltage grade of 110kv or above, a booster station ground grid grounding resistance detector, an in-station grid conduction test detector and an SF6 gas leakage detection test detector;
(2) a preventive test period optimization subsystem of 35kV current collection line equipment comprises an insulation resistance and direct current resistance test detector, an insulation oil chromatography test detector, a transformation ratio test and alternating current withstand voltage test detector of a box transformer substation, a 35kV lightning arrester test detector, an infrared temperature measurement test detector of a lightning arrester and a power failure test detector, and is used for an insulator detection first infrared thermal imager and a grounding grid grounding resistance test device.
Preferably, the preventive test period optimization subsystem of the wind power plant booster station further comprises a timer for prompting that the ground grid grounding resistance test of the booster station is performed once every 6 years and the ground grid conduction test of the booster station is performed once every 3 years.
Preferably, the periodic optimization subsystem for the preventive test of the wind power plant booster station further comprises an infrared thermometer, and the infrared thermometer is used for performing an SF6 gas leak detection test under the condition that the equipment is electrified.
Preferably, the 35kV collecting line equipment preventive test period optimizing subsystem further comprises a timer for prompting that preventive tests are carried out at corresponding time points at wind farm locations where the 35kV lightning arrester test period is determined to be 1 year and the lightning arrester test period is determined to be 3 years according to the running state of the wind farm lines and the frequency analysis of lightning strikes, and is also used for prompting that one-time ground grid ground resistance test is carried out on the fan and the box-to-box transformer ground grid every year.
Preferably, the preventive test period optimization subsystem of the 35kV current collection line equipment further comprises a second infrared thermal imager, and the phenomena of excessive bending, excessive stretching, external damage, rainwater soaking and poor grounding of the cable are detected in the inspection process.
The method and the system for optimizing the preventive test period of the booster station and the 35kV current collection line equipment in the wind power plant are adopted, and preventive tests are performed on the booster station and the 35kV current collection line equipment in a pertinence and important distinguishing mode, so that the operation risks of all parts of the equipment are accurately evaluated, hidden dangers in the operation equipment are found in time, the equipment is prevented from being damaged, the safe operation of the equipment is guaranteed, and the power failure accident of the whole plant is prevented.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. The objects and features of the present invention will become more apparent in view of the following description taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a flowchart of a preventive test period optimization method for a wind farm booster station and a 35kV current collection line device according to an embodiment of the invention;
FIG. 2 is a block diagram of a preventive test period optimization system for a wind farm booster station and a 35kV collector line device according to an embodiment of the invention.
Detailed Description
The embodiment relates to wind power plant equipment related to projects of a mountain typhoon electric field, a Dexiyu wind power field and a PingLu Yugai temple wind power field in the third stage of the wind power plant in the Mao.
Referring to the attached drawing 1, aiming at the pre-test maintenance of the booster station, the preventive test optimization of the booster station of the wind power plant aims at timely finding out hidden dangers in the operation equipment of the booster station with the voltage level of 110kv and above of the wind power plant belonging to the company, preventing the equipment from being damaged and ensuring the safe operation of the equipment, and according to the operation state of the booster station with the voltage level of 110kv and above of the wind power plant belonging to the north branch company of Tianrun Hua, the following preventive test optimization measures are specially made in combination with the state maintenance requirements. The optimization basis of the preventive test of the wind power station booster station is 'China North China Power grid Limited company Power equipment transfer and preventive test regulations' 2008 edition, GB50150-2006 'Electrical device installation engineering Electrical device transfer test Standard', 'inner Mongolia Power company Power equipment preventive test regulations' 2009 edition, and 'inner Mongolia Power company Power Transmission and transformation Equipment State Overhaul test regulations' 2013 edition. The optimization principle of the preventive test of the wind power station booster station is as follows: (1) and comprehensively analyzing and judging the equipment inspection record, defect summary and routine test, online detection, equipment family defects, poor operation conditions and other information of the booster station with the voltage level of 110kv or above. (2) For the power failure routine test, the standard period of the equipment with the voltage of 110kv and above is 3 years; the standard period of the equipment of 35kv and below is 4 years, the equipment of a plurality of voltage classes in a transformer substation is considered, in order to avoid repeated power failure situations caused by different standard periods of power failure routine tests, when the equipment of a high voltage class in the same transformer substation reaches the power failure routine test period to be tested, the equipment of a low voltage class is scheduled to be tested at the same time as much as possible, and for the condition that no abnormity possibly endangering the safe operation of the equipment is found in inspection, the state of the electrified monitoring equipment is good, the result of the last routine test is not obviously different from the result of the last routine (handover) test, no family defect possibly endangering the safe operation of the equipment is caused, and the equipment is not subjected to serious bad working conditions since the last routine test, the preventive test can be carried out for 1 year. (3) For a device to meet one of the following conditions, it is necessary to schedule preventive trials in advance or as soon as possible. The equipment finds abnormality in the inspection process, the abnormality can be caused by serious quality hidden danger, the state of the equipment is poor through live detection and display, the conventional routine test has an obvious trend of developing towards an attention value or an alarm value or is close to the attention value or the alarm value, the equipment has familial defects and is subjected to serious poor working conditions, and whether the equipment has substantial damage or not can not be determined without the test. (4) If the equipment is preliminarily judged to have risks in continuous operation, whether the equipment is expired or not, a preventive test plan is adjusted, the test period is shortened, and the equipment is quitted to operate as soon as possible to perform the test in serious conditions.
For this reason, the preventive test optimization measures of the wind power plant booster station in the embodiment include:
(1) the method comprises the steps that an arrester with a 35kv voltage level, a current transformer, a voltage transformer, a vacuum circuit breaker and an overvoltage protector in a booster station are used for conducting transverse and longitudinal comparison on running states according to routine test data of the same manufacturer in the same batch and in the same state under similar running and detection conditions, searching for equipment degradation rules and summarizing experience, and optimizing a preventive test period.
(2) The health condition of equipment should be comprehensively analyzed by combining equipment inspection data and infrared thermal imaging monitoring data for a transformer, a current transformer, a capacitor voltage transformer, an SF6 circuit breaker, an outdoor high-voltage isolating switch and a lightning arrester with voltage levels of 110kv and above, and the equipment with poor working conditions should be focused;
(3) the ground resistance test of the ground network of the booster station is carried out once every 6 years, and the conduction test of the ground network of the booster station is carried out once every 3 years.
(4) The lightning arrester live test of 110kv and above can replace the power failure test.
(5) The SF6 gas leak test utilizes an infrared thermometer to detect when the device is powered.
Aiming at the preventive test of the 35kv current collection line, the optimization aims to find hidden troubles in the running equipment of the 35kv current collection line in time, prevent the equipment from being damaged and ensure the safe running of the equipment. The optimization basis of the preventive test of the 35kv current collection line is 'China North China Power grid Limited company electric power equipment handover and preventive test regulation' 2008 edition, GB50150-2006 'Electrical device installation engineering Electrical equipment handover test standard', 'inner Mongolia Power company electric power equipment preventive test regulation' 2009 edition, 'inner Mongolia Power company Power Transmission and transformation equipment State overhaul test regulation' 2013 edition, and 'overhead Transmission line operation regulation DLT 741-2010'. The optimization principle of the preventive test of the 35kv current collection line is as follows: (1) comprehensively analyzing and judging the information based on the inspection record, defect summary and routine test, on-line detection, equipment family defects, poor operation conditions and the like of 35kv current collection line equipment; (2) for the power failure routine test, the reference period of the equipment with the voltage of 35kv and below is 4 years, and for the equipment which is not found to be abnormal in inspection and possibly endangering the safe operation of the equipment, the state of the electrified monitoring equipment is good, the result of the last routine test is not obviously different from the result of the last routine (handover) test, any family defect possibly endangering the safe operation of the equipment is absent, and the equipment is not subjected to serious adverse working conditions since the last routine test, the preventive test can be carried out for 1 year; (3) for a device to meet one of the following conditions, it is necessary to schedule preventive trials in advance or as soon as possible. The equipment finds abnormality in the routing inspection, the abnormality can be caused by serious quality hidden danger, the state of the equipment is poor through live detection and display, the conventional routine test has an obvious trend of developing towards an attention value or a warning value or is close to the attention value or the warning value, the equipment has familial defects and is subjected to more serious poor working conditions, and whether the equipment state is substantially damaged or not can not be determined without the test; (4) if the equipment is preliminarily judged to have risks in continuous operation, whether the equipment is expired or not, a preventive test plan is adjusted, the test period is shortened, and the equipment is quitted to operate as soon as possible to perform the test in serious conditions.
Therefore, according to the operation state of a 35kv current collection circuit of a wind power plant belonging to Beijing Tianrun North China Branch company, the following preventive test optimization measures are made in combination with the state maintenance requirements:
(1) the three-phase box transformer of the Damao wind power plant has family defects, all test items are required to be performed 1 time every year, other wind power plants are subjected to spot inspection 30% every year on each line, the general inspection is completed in a period of 3 years, and insulation resistance and direct current resistance tests and insulation oil chromatography tests are performed. And under the similar operation and detection conditions, routine test data, historical oil chromatography test data and operation state transverse and longitudinal comparison are carried out on the box transformer substation in the same batch and in the same state by the same manufacturer, the rule of equipment is searched, the experience is summarized, and the preventive test period is further optimized.
(2) Other tests of box-type transformers, for example: the transformation ratio test and the alternating current withstand voltage test can be selectively carried out according to the running state of the equipment. The ac withstand voltage test is a destructive test and is performed when a winding problem is suspected.
(3) According to the line running states and the lightning stroke frequency analysis of a large-mountain typhoon electric field, a Damao wind field, a Dexie wind field and a PingLuyunshan temple wind field, the test period of the 35kv lightning arrester of the wind field is 1 year, and the test period of the lightning arresters of other wind fields is 3 years. The method is mainly characterized in that the iron tower overhead line arrester is focused on, the defect of resistance card aging or internal moisture is predicted through analyzing the infrared temperature measurement data and routine test data of the arrester, the test period is adjusted in time for the arrester with poor operation conditions, the health state of the arrester is further judged through a power failure test, the test specification is required, the influence of corona and external insulation surface leakage current is eliminated in the test process, the accuracy of the test data is ensured, the arrester with the test data exceeding the specification requirement is replaced in time, and meanwhile, the degradation rule is summarized.
(4) The 35kv cable attaches importance to infrared thermal imaging detection, each wind power station adjusts the test period at any time according to the running state of the cable, and the withstand voltage test is carried out after the cable head is replaced. In the inspection process, the phenomena of excessive bending, excessive stretching, external damage, rainwater soaking and poor grounding of the cable are also focused.
(5) And aiming at the condition that the zero value detection rate of a certain batch of suspension insulators is obviously higher than the operation experience value, shortening the zero value detection period of the batch of insulators as appropriate, paying attention to the insulators with flash marks, timely replacing the zero value or low value insulators, testing the insulation resistance of two tower insulators close to a line tower which is struck by lightning, recording and searching for the insulator degradation rule.
(6) The grounding resistance of the grounding network of the wind turbine and the box transformer substation is tested once every year, the grounding resistance of a line iron tower and a tower can be tested by a wheel test method, namely, a part of the grounding resistance is detected every year, general testing is completed in 5 years, each wind power station in an area with complex terrain can be mastered as appropriate, and unqualified iron towers and tower grounding networks are reformed.
Referring to fig. 2, a preventive test period optimization system for a wind farm booster station and a 35kV collector line device includes the following subsystems:
(1) the preventive test period optimization subsystem of the wind power station booster station comprises: comprises a lightning arrester detector with 35kv voltage class, a current transformer detector, a voltage transformer detector, a vacuum circuit breaker detector and an overvoltage protector detector in a wind power plant booster station, the system comprises a transformer live detector, a current transformer detector, a capacitance voltage transformer detector, an SF6 breaker detector, an outdoor high-voltage isolating switch detector, a lightning arrester detector, a booster station ground grid ground resistance detector, an in-station ground grid conduction test detector and an SF6 gas leakage detection test detector with the voltage class of 110kv and above, wherein a preventive test period optimization subsystem of the booster station of the wind farm further comprises a timer for prompting that the booster station ground grid ground resistance test is carried out once every 6 years and the in-station ground grid conduction test is carried out once every 3 years, and further comprises an infrared thermometer for carrying out an SF6 gas leakage detection test by using the infrared thermometer under the condition that equipment is electrified;
(2) the 35kV collecting line equipment preventive test period optimization subsystem comprises an insulation resistance and direct current resistance test detector, an insulation oil chromatography test detector, a box transformer transformation ratio test and alternating current withstand voltage test detector, a 35kV arrester test detector, an arrester infrared temperature test detector and a power failure test detector, a first infrared thermal imager for insulator detection and a ground grid ground resistance test device, and further comprises a timer for prompting that the wind field location with the 35kV arrester test period of 1 year and the arrester test period of 3 years is determined according to the running state of the wind field line and the frequency analysis of lightning stroke occurrence to carry out preventive test at corresponding time points, and is also used for prompting that the wind field and the box transformer ground grid carry out ground resistance test once every year; in addition, the preventive test period optimization subsystem of the 35kV current collection line equipment further comprises a second infrared thermal imager, and the phenomena of excessive bending, excessive stretching, external damage, rainwater soaking and poor grounding of the cable are detected in the inspection process.
The method and the system for optimizing the preventive test period of the booster station and the 35kV current collection line equipment in the wind power plant are adopted, and preventive tests are performed on the booster station and the 35kV current collection line equipment in a pertinence and important distinguishing mode, so that the operation risks of all parts of the equipment are accurately evaluated, hidden dangers in the operation equipment are found in time, the equipment is prevented from being damaged, the safe operation of the equipment is guaranteed, and the power failure accident of the whole plant is prevented.
While the present invention has been described with reference to the particular illustrative embodiments, it is not to be restricted by the embodiments but only by the appended claims. It will be understood by those skilled in the art that variations and modifications of the embodiments of the present invention can be made without departing from the scope and spirit of the invention.
Claims (2)
1. A method for optimizing preventive test periods of a wind power plant booster station and 35kV current collection line equipment is characterized by comprising the following steps:
(1) the method comprises the steps of optimizing a preventive test period of a wind power plant booster station, wherein the preventive test period comprises an arrester with a voltage grade of 35kv, a current transformer, a voltage transformer, a vacuum circuit breaker and an overvoltage protector in the wind power plant booster station, a transformer with a voltage grade of 110kv or above, the current transformer, a capacitor voltage transformer, an SF6 circuit breaker, an outdoor high-voltage isolating switch and the arrester, optimizing ground network grounding resistance of the booster station, an in-station network conduction test and an SF6 gas leakage test;
(2) carrying out preventive test period optimization on 35kV current collection line equipment, wherein the preventive test period optimization comprises insulation resistance and direct current resistance tests, insulating oil chromatography tests, box transformer transformation ratio tests and alternating current withstand voltage tests, the test period determination of a 35kV lightning arrester, the period optimization of infrared temperature measurement tests and power failure tests of the lightning arrester, infrared thermal imaging detection, insulator detection and grounding resistance tests of a ground grid;
the method for optimizing the preventive test period of the wind power field booster station in the step (1) comprises the following steps:
(1-1) carrying out transverse and longitudinal comparison on running states of lightning arresters, current transformers, voltage transformers, vacuum circuit breakers and overvoltage protectors with 35kv voltage levels in a booster station according to routine test data of the same manufacturer in the same batch and state under similar running and detection conditions, searching equipment degradation rules and summarizing experience, and optimizing a preventive test period;
(1-2) comprehensively analyzing the health condition of equipment by combining equipment inspection data and infrared thermal imaging monitoring data of a transformer, a current transformer, a capacitor voltage transformer, an SF6 circuit breaker, an outdoor high-voltage isolating switch and a lightning arrester with the voltage level of 110kv or above, and detecting electrical equipment with poor working conditions;
(1-3) testing the ground resistance of the large ground network of the booster station once every 6 years, and testing the conduction of the ground network of the booster station once every 3 years;
(1-4) replacing a lightning arrester with 110kv or more in a power failure test electrification test;
(1-5) carrying out SF6 gas leakage detection test by using an infrared thermometer under the condition that the equipment is electrified;
the periodic optimization principle of the wind power plant booster station preventive test in the step (1) comprises the following steps:
(1) comprehensively analyzing and judging the equipment inspection record, defect summary and routine test, online detection, equipment family defects, poor operation conditions and other information of the booster station with the voltage level of 110kv or above;
(2) for the power failure routine test, the standard period of the equipment with the voltage of 110kv and above is 3 years; the standard period of the equipment of 35kv and below is 4 years, the equipment of a plurality of voltage classes in a transformer substation is considered, in order to avoid repeated power failure conditions caused by different standard periods of power failure routine tests, when the equipment of a high voltage class in the same transformer substation reaches the power failure routine test period to be tested, the equipment of a low voltage class is arranged to be subjected to routine tests as simultaneously as possible, and for the condition that no abnormity possibly endangering the safe operation of the equipment is found in routing inspection, the state of the electrified monitoring equipment is good, the handing-over test result of the previous routine test and the previous routine test result is not obviously different, any family defect possibly endangering the safe operation of the equipment is absent, the equipment is not subjected to serious bad working conditions since the previous routine test, the preventive test can be carried out for 1 year;
(3) for a device to meet one of the following conditions, preventive trials need to be scheduled in advance or as soon as possible: the equipment finds abnormality in the routing inspection, the abnormality can be caused by serious quality hidden danger, the state of the equipment is poor through live detection and display, the conventional routine test has an obvious trend of developing towards an attention value or a warning value or is close to the attention value or the warning value, the equipment has familial defects and is subjected to more serious poor working conditions, and whether the equipment state is substantially damaged or not can not be determined without the test;
(4) if the risk exists in the continuous operation of the equipment is preliminarily judged, whether the equipment is expired or not, a preventive test plan is adjusted, the test period is shortened, and the equipment is quitted to operate as soon as possible to perform the test under serious conditions;
and (3) preventive test periodic optimization measures of the 35kv current collection line equipment in the step (2):
(2-1) for the box transformer with family defects, all test items are performed 1 time per year, in other cases, each line is subjected to spot inspection 30% per year, the general test is completed in a period of 3 years, and an insulation resistance and direct current resistance test and an insulation oil chromatography test are performed; under the similar operation and detection conditions, routine test data, historical oil chromatography test data and operation states of the box transformer in the same batch and in the same state of the same manufacturer are transversely and longitudinally compared, the rule of equipment and the experience are searched, and the preventive test period is further optimized;
(2-2) carrying out a transformation ratio test and an alternating current withstand voltage test of the box-type transformer, the alternating current withstand voltage test belonging to the destructive test being selectively carried out according to the operation state of the equipment, the alternating current withstand voltage test being carried out only when a winding problem is suspected;
(2-3) determining the wind field location with a 35kv lightning arrester test period of 1 year and a lightning arrester test period of 3 years according to the running state of the wind power plant line and the frequency analysis of lightning stroke occurrence, focusing on the overhead line lightning arrester of the iron tower, predicting the defect of aging or internal moisture of a resistor disc by analyzing infrared temperature measurement data and routine test data of the lightning arrester, adjusting the test period in time for the lightning arrester with poor running condition, further judging the health state of the lightning arrester through a power failure test, eliminating the influence of corona and leakage current of an external insulation surface in the test process, ensuring the accuracy of test data, timely replacing the lightning arrester with test data exceeding the regulation requirement, and summarizing the deterioration rule;
(2-4) carrying out infrared thermal imaging detection, adjusting the test period of each wind power plant at any time according to the running state of the cable, carrying out a voltage-withstanding test after replacing the cable head, and detecting whether the cable has phenomena of excessive bending, excessive stretching, external damage, rainwater soaking and poor grounding in the routing inspection process;
(2-5) if the zero value detection rate of a certain batch of suspension insulators is obviously higher than an operation experience value, shortening a zero value detection period of the batch of insulators as appropriate, detecting the insulators with lightning stroke traces, replacing the zero value or low value insulators, performing insulation resistance test on two tower insulators close to a line tower subjected to lightning stroke, recording, and searching for an insulator degradation rule;
(2-6) carrying out once ground network grounding resistance test on the fan and box transformer substation ground network every year, adopting a wheel test method, namely detecting grounding resistance of a part of line iron towers and towers every year, completing general test in 5 years, and transforming unqualified iron towers and tower ground networks;
the periodic optimization principle of the preventive test of the 35kv current collection line equipment in the step (2) comprises the following steps:
(1) comprehensively analyzing and judging the information based on the inspection record, defect summary and routine test, on-line detection, equipment family defects, poor operation conditions and the like of 35kv current collection line equipment;
(2) for the power failure routine test, the reference period of the equipment with the voltage of 35kv and below is 4 years, and for the equipment which is not found to be abnormal in inspection and possibly endangering the safe operation of the equipment, the state of the charged monitoring equipment is good, the result of the last routine test is not obviously different from the result of the last routine handover test, any family defect possibly endangering the safe operation of the equipment is absent, and the equipment is not subjected to serious adverse working conditions since the last routine test, the preventive test can be carried out for 1 year;
(3) for a device to meet one of the following conditions, preventive trials need to be scheduled in advance or as soon as possible: the equipment finds abnormality in the routing inspection, the abnormality can be caused by serious quality hidden danger, the state of the equipment is poor through live detection and display, the conventional routine test has an obvious trend of developing towards an attention value or a warning value or is close to the attention value or the warning value, the equipment has familial defects and is subjected to more serious poor working conditions, and whether the equipment state is substantially damaged or not can not be determined without the test;
(4) if the equipment is preliminarily judged to have risks in continuous operation, whether the equipment is expired or not, a preventive test plan is adjusted, the test period is shortened, and the equipment is quitted to operate as soon as possible to perform the test in serious conditions.
2. A wind power plant booster station and 35kV collecting line equipment preventive test cycle optimization system is used for executing the cycle optimization method of claim 1, and is characterized by comprising the following subsystems:
(1) the preventive test period optimization subsystem of the wind power station booster station comprises: the device comprises an arrester detector, a current transformer detector, a voltage transformer detector, a vacuum circuit breaker detector and an overvoltage protector detector with the voltage grade of 35kv in a wind power station booster station, a transformer live detector, a current transformer detector, a capacitance voltage transformer detector, an SF6 circuit breaker detector, an outdoor high-voltage isolating switch detector, an arrester detector with the voltage grade of 110kv or above, a booster station ground grid grounding resistance detector, an in-station grid conduction test detector and an SF6 gas leakage detection test detector;
(2) the preventive test period optimization subsystem for the 35kV current collection line equipment comprises an insulation resistance and direct current resistance test detector, an insulation oil chromatography test detector, a box transformer transformation ratio test and alternating current withstand voltage test detector, a 35kV lightning arrester test detector, a lightning arrester infrared temperature measurement test detector and a power failure test detector, and is used for an insulator detection first infrared thermal imager and grounding grid grounding resistance test equipment;
the preventive test period optimization subsystem of the wind power plant booster station further comprises a timer for prompting that the ground network grounding resistance test of the booster station is carried out once every 6 years and the ground network conduction test in the booster station is carried out once every 3 years;
the wind power station booster station preventive test period optimization subsystem further comprises an infrared temperature detector, and an SF6 gas leakage detection test is carried out by using the infrared temperature detector under the condition that equipment is electrified;
the system comprises a wind field test period optimization subsystem, a wind field test period optimization subsystem and a case-to-case grounding grid, wherein the wind field test period optimization subsystem comprises a timer for prompting that the places of wind fields with the 35kV lightning arrester test period of 1 year and the lightning arrester test period of 3 years are determined to be subjected to preventive tests at corresponding time points according to the running state of the wind field lines and the frequency analysis of lightning strikes, and is also used for prompting that the wind field and the case-to-case grounding grid are subjected to one-time grounding resistance test every year;
the preventive test period optimization subsystem of the 35kV current collection line equipment further comprises a second infrared thermal imager, and the phenomena of excessive bending, excessive stretching, external damage, rainwater soaking and poor grounding of the cable in the inspection process are detected.
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