CN108414898A - A kind of condition test method and system of wind farm device live detection - Google Patents

Abstract

The invention provides a state test method for live detection of wind farm equipment, including: (1) live detection: collect data through instruments, implement live detection combined with ultrasonic partial discharge detection and ultraviolet imaging detection, and monitor the running state of wind farm equipment , to detect and prevent faults; (2) Build a decision-making system for condition-based maintenance: collect and analyze equipment operating data, and carry out status evaluation work on equipment, so as to determine whether the equipment needs to be overhauled and determine the maintenance items; (3) Establish an equipment forecast Trial maintenance optimization plan: Through the condition maintenance of wind farm equipment, combined with the implementation of live detection of equipment, the state evaluation of equipment is carried out according to the detailed rules of wind farm equipment condition evaluation, and a customized maintenance strategy is formulated. A corresponding detection system is also disclosed, which adopts a charging detection method combining ultrasonic partial discharge detection and ultraviolet imaging detection, optimizes test items, and saves pre-test maintenance costs.

Description

A state test method and system for live detection of wind farm equipment

technical field

The invention belongs to the field of state evaluation and maintenance of electric equipment, and in particular relates to a state test method and system for live detection of wind farm equipment.

Background technique

The operating status of wind power generation equipment depends on the operating status of the overall structure of the wind power generating equipment. By monitoring and evaluating the operating status of wind farm equipment, hidden dangers can be discovered in time, the cause of the problem can be found out, and corresponding measures can be taken for the faulty parts of the equipment. Corresponding maintenance and repair measures provide the basis, which can not only save the maintenance and repair costs of wind power generation equipment, but more importantly, prevent the entire power generation process from stopping due to structural failures, and even bring danger to people's lives, as well as to enterprises. cause major economic losses.

Condition Based Maintenance (CBM) refers to the method of judging equipment abnormalities, predicting equipment failures, and performing maintenance before failures occur based on equipment status information provided by advanced condition monitoring and diagnostic technologies, that is, according to the health status of equipment To arrange the maintenance plan and implement equipment maintenance. The biggest difference between condition-based maintenance and planned maintenance is that condition-based maintenance is based on the state of the equipment during the maintenance process, which makes the equipment maintenance more targeted. Before maintenance, the relevant staff need to check and analyze the structural characteristics of the wind farm equipment, the operating status of the equipment, and the results of the equipment during the test, and then determine whether the equipment needs to be repaired according to the inspection and analysis results Carry out maintenance and determine the project content of maintenance. Because the condition-based maintenance is based on the working status of the equipment to determine whether it needs to be overhauled and the items to be overhauled, so that the overhaul of the equipment is targeted, the cost of overhaul is reduced, and the working efficiency of the wind farm equipment is better improved. The state evaluation methods in the prior art are divided into: probability statistics method, intelligent method based on neural network, fuzzy evaluation method and knowledge-based expert system, each of which has its own advantages and limitations. There is no systematic and mature technology for monitoring and forecasting of operating status. Most enterprises adopt a system of coexistence of planned maintenance and post-event maintenance for the maintenance and management of power generation equipment, and only a very small number of enterprises use a system that combines planned maintenance, condition maintenance and post-event maintenance. However, the research work on condition assessment of wind power generation equipment is still in its infancy, and there are not many studies on condition assessment and condition-based maintenance in this area.

For a long time, the power generation and power supply equipment of China's power system has adopted regular preventive tests and regular planned maintenance, which requires less investment, long downtime, and high maintenance costs. At the same time, if there are problems with the quality of maintenance, it will bring more defects. In recent years In the future, with the advancement of equipment manufacturing technology and the development of sensor technology and computer technology, as well as the requirements for power supply reliability, periodic planned maintenance can no longer meet the needs of modern production. Condition-based maintenance is a method based on equipment status. The maintenance method based on the development trend of equipment status, based on reliability and preventive maintenance technology, according to the results of online detection and offline measurement of latent faults, combined with inspection data, historical reliability data and artificial intelligence technology, The state of the equipment is evaluated, and this is used to guide and arrange the maintenance of the equipment.

The live detection of power equipment can help us analyze and judge the health status of the equipment, reduce blindness and randomness in work, extend the detection cycle, and provide a basis for condition-based maintenance. Partial discharge is the main reason for the gradual aging and final breakdown of organic insulation. The partial discharge of equipment can reflect the insulation status of equipment and provide a reliable basis for condition-based maintenance. During corona discharge, high-voltage electrical equipment will radiate light waves and sound waves, as well as ozone and ultraviolet rays. Ultraviolet imaging technology uses special instruments to receive ultraviolet signals generated by corona discharge, and after processing, it will be imaged and superimposed with visible light images to achieve The purpose of determining the position and intensity of the corona is to provide a reliable basis for further evaluation of the operation of the equipment. The two detection methods overlap in principle. The ultraviolet imaging detection is easily affected by the distance factor. The instrument internally performs gain processing on the ultraviolet photons entering the optical system. The influence of air pressure, temperature and humidity is also very serious. In practical applications, humidity The increase of corona will cause the increase of corona intensity, but due to the uncertainty of pollution components and humidity, there is no way to correct its influence at present. Therefore, it will affect the judgment of the nature, location and severity of the internal fault of the equipment.

Contents of the invention

The technical problem to be solved by the present invention is: to overcome the deficiencies in the prior art, to provide a state test method and system for wind farm equipment live detection, which adopts the live detection means combined with ultrasonic partial discharge detection and ultraviolet imaging detection, and evaluates the state according to the The detailed rules analyze the equipment status, issue the equipment status evaluation and analysis report, establish the maintenance pre-test implementation plan, optimize the test items, and save the cost of pre-test maintenance.

For this reason, the object of the present invention is to provide a kind of state test method of wind farm equipment charging detection, and this method comprises the steps:

(1) Live detection: collect data through instruments, implement live detection combined with ultrasonic partial discharge detection and ultraviolet imaging detection, so as to effectively monitor the operation status of wind farm equipment, and detect and prevent faults;

(2) Construct a decision-making system for condition-based maintenance: by collecting and analyzing equipment operation data, carry out condition evaluation of equipment, so as to determine whether the equipment needs maintenance and determine the maintenance items;

(3) Establish an optimization plan for equipment pre-test maintenance: through the condition maintenance of wind farm equipment, combined with the implementation of equipment live detection, evaluate the equipment status according to the wind farm equipment status evaluation rules, formulate customized maintenance strategies, extend the maintenance test period, and optimize Maintenance test items, so as to reduce maintenance test costs, prevent equipment from being over-maintained or under-maintained, and further improve equipment stability.

Preferably, the step (1) of ultraviolet imaging detection is based on the horizontal comparison of the ultraviolet image or ultraviolet photon number count of the corona discharge of the charged equipment, and the abnormal corona attribute, occurrence location and severity are graphically observed and judged and the defect is graded.

Preferably, the step (1) ultrasonic partial discharge detection collects the acoustic signal in the interval of 20kHz-200kHz emitted by the power equipment and the line partial discharge through the non-contact ultrasonic sensor, and detects the amplitude, phase, frequency, noise, etc. of the acoustic signal, And the relationship with the operating voltage, so that the degree of insulation defect of the equipment can be reflected by the decibel dB value.

Preferably, the decibel dB value ≥ 200 is a major defect.

Preferably, said step (2) includes:

(2-1) Set maintenance goals based on clarity, measurability, achievability, relevance and time limit, and obtain the ultimate goal of maintenance by determining comparison benchmarks;

(2-2) Formulate maintenance decision-making plan according to time;

(2-3) Use data collection tables, histograms, Pareto diagrams, fishbone diagrams, 5Why analysis, RCM analysis and PM analysis methods to determine the causes of repeated failures of wind farm equipment;

(2-4) Use the histogram to track the data of the maintenance results;

(2-5) Standardize the maintenance decision-making plan according to CIL standard, SOP/WI standard, TBM/CBM standard, and Q/M matrix.

Preferably, the step (2-2) includes: after ultraviolet imaging detection and ultrasonic partial discharge comprehensive detection, there is an abnormal discharge to the equipment, but it will not cause an accident, and it is generally recorded on the record, and the development of the defect is observed; The abnormality is prominent, but it will not cause an accident immediately, shorten the inspection cycle, and deal with a power outage; if there is a serious discharge to the equipment, or affects the safe operation of the equipment, it may cause an accident in the short term, and arrange a power outage as soon as possible. Through the analysis of the live detection data, the effective monitoring of the live running status of the equipment can be achieved.

Preferably, the detailed rules for status evaluation of wind farm equipment in step (3) include: detailed rules for status evaluation of 35kv-220kv capacitive voltage transformers, detailed rules for status evaluation of 35kv-220kv arresters, detailed rules for status evaluation of 35kv-220kv current transformers, and detailed rules for 35kv-220kv SF6 Detailed rules for status evaluation of high-voltage switchgear, detailed rules for status evaluation of 35kv-220kv isolating switches and earthing switches, detailed rules for status evaluation of 35kv-220kv oil-immersed power transformers.

Preferably, the step (3) equipment pre-test overhaul includes: 35kV collector line pre-test overhaul and step-up station pre-test overhaul.

The present invention also provides a state test system for live detection of wind farm equipment, and implements a corresponding state test method. The system includes the following subsystems:

(1) Live detection subsystem: including ultraviolet imaging detector and ultrasonic partial discharge detector, collect data through two detectors, so as to effectively monitor the operation status of wind farm equipment, and detect and prevent faults;

(2) Condition-based maintenance decision-making subsystem: including data analyzers, internally implanted equipment status evaluation standards, collecting and analyzing equipment operation data through the information collection subsystem, and using data analyzers to carry out status evaluation work on equipment, so as to determine whether the equipment is Items that need to be overhauled and determined to be overhauled;

(3) Equipment pre-test maintenance subsystem: including the 35kV current collector line pre-test maintenance system and the booster station pre-test maintenance system, two of which include infrared thermal imagers and infrared thermometers for detection.

Through the adoption of equipment live detection research, promote the comprehensive live detection methods of ultrasonic partial discharge detection and ultraviolet imaging detection, analyze the equipment state according to the state evaluation rules, issue the equipment state evaluation analysis report, establish the maintenance pre-test implementation plan, optimize the test items, and save the pre-test Overhaul costs.

Those skilled in the art will be more aware of the above and other objects, advantages and features of the present invention according to the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings.

Description of drawings

Hereinafter, some specific embodiments of the present invention will be described in detail by way of illustration and not limitation with reference to the accompanying drawings. The same reference numerals in the drawings designate the same or similar parts or parts. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. The objectives and features of the present invention will be more apparent in consideration of the following description in conjunction with the accompanying drawings, in the accompanying drawings:

Accompanying drawing 1 is the flow chart of the state test system method of live detection of wind farm equipment according to an embodiment of the present invention;

Accompanying drawing 2 is the block diagram of the state test system of the wind farm equipment electrification detection according to the embodiment of the present invention;

Accompanying drawing 3 is a typical fault tree model of a capacitive voltage transformer according to an embodiment of the present invention;

Accompanying drawing 4 is according to the typical fault tree model of arrester of the embodiment of the present invention;

Accompanying drawing 5 is a typical fault tree model of a current transformer according to an embodiment of the present invention, wherein accompanying drawing 5-1 represents an oil-immersed current transformer, and Fig. 5-2 represents a SF ₆ type current transformer;

Accompanying drawing 6 is according to the _SF6 high voltage switchgear typical fault tree model of the embodiment of the present invention;

Accompanying drawing 7 is a typical fault tree model of a disconnector and an earthing switch according to an embodiment of the present invention;

Accompanying drawing 8 is according to the typical fault tree model of the oil-immersed power transformer (reactor) of the embodiment of the present invention;

Accompanying drawing 9 is an ultrasonic partial discharge detector according to an embodiment of the present invention;

Accompanying drawing 10 is the ultraviolet imaging detector according to the embodiment of the present invention.

Detailed ways

This embodiment is the wind farm equipment involved in the third phase of Damao Wind Farm, Dashantai Wind Farm, Youyu Wind Farm, and Pinglu Yungaisi Wind Farm Project, wherein Figure 1 is the live detection of wind farm equipment according to the embodiment of the present invention The flow chart of the state test method, including:

(1) Live detection: collect data through instruments, implement live detection combined with ultrasonic partial discharge detection and ultraviolet imaging detection, so as to effectively monitor the operation status of wind farm equipment, detect and prevent faults, and ultraviolet imaging detection is the basis China's electric power industry standard "DL_T 345-2010 Guidelines for the Application of Ultraviolet Diagnosis Technology for Live Equipment" requires that a horizontal comparison be made based on the UV image or UV photon count of the corona discharge of live equipment to graph the abnormal corona properties, occurrence location and severity Observation Judgment and Defect Rating. At present, the provincial electrical research institutes are widely used in the inspection of 110kV-500kV voltage level equipment and line inspection, to evaluate and grade the abnormal discharge of equipment and lines, and the effect is remarkable; ultrasonic partial discharge detection is collected by non-contact ultrasonic sensors Acoustic signals in the range of 20kHz-200kHz emitted by power equipment and lines during partial discharge, detect the amplitude, phase, frequency, noise, etc. of the acoustic signal, and the relationship with the operating voltage, so as to reflect the degree of insulation defect of the equipment through the decibel dB value , According to the manufacturer's recommendation, the dB value ≥ 200 is a major defect. At present, various provincial electrical research institutes are actively participating in manufacturers' ultrasonic partial discharge detection tests. After the trial of ultrasonic partial discharge detection in Damao Wind Field, the detection effect on abnormal discharge of 35kV collector line fittings, drop insurance, cable heads, and 35kV switchgear is obvious.

(2) Construct a decision-making system for condition-based maintenance: by collecting and analyzing equipment operating data, carry out condition evaluation of equipment, so as to determine whether the equipment needs to be overhauled and determine the maintenance items, including:

(2-1) Set maintenance goals based on clarity, measurability, achievability, relevance and time limit, and obtain the ultimate goal of maintenance by determining comparison benchmarks;

(2-2) Make a time-based maintenance decision-making plan, including: after ultraviolet imaging detection and ultrasonic partial discharge comprehensive detection, if there is an abnormal discharge of the equipment, but it will not cause an accident, it will generally be recorded on the record, and the development of the defect will be observed; If there is an abnormal discharge, but it will not cause an accident immediately, shorten the inspection cycle, and deal with a power outage; if there is a serious discharge to the equipment, or affect the safe operation of the equipment, it may cause an accident in the short term, and arrange a power outage as soon as possible. Through the analysis of the live detection data, the effective monitoring of the live running state of the equipment can be achieved;

(2-3) Use data collection tables, histograms, Pareto diagrams, fishbone diagrams, 5Why analysis, RCM analysis and PM analysis methods to determine the causes of repeated failures of wind farm equipment;

(2-4) Use the histogram to track the data of the maintenance results;

(2-5) Standardize the maintenance decision-making plan according to CIL standard, SOP/WI standard, TBM/CBM standard, and Q/M matrix.

(3) Establish an optimization plan for equipment pre-test maintenance: equipment pre-test maintenance includes: 35kV collector line pre-test maintenance and booster station pre-test maintenance. Through the condition inspection of wind farm equipment, combined with the implementation of live detection of equipment, the status evaluation of equipment is carried out according to the detailed rules of wind farm equipment status evaluation. The detailed rules of wind farm equipment status evaluation include: 35kv-220kv capacitor voltage transformer status evaluation rules, 35kv-220kv Detailed rules for status evaluation of lightning arresters, detailed rules for status evaluation of 35kv-220kv current transformers, detailed rules for status evaluation of 35kv-220kv SF6 high-voltage switchgear, detailed rules for status evaluation of 35kv-220kv isolating switches and earthing switches, detailed rules for status evaluation of 35kv-220kv oil-immersed power transformers. Formulate customized maintenance strategies, extend the maintenance test cycle, and optimize maintenance test items, so as to reduce maintenance test costs, prevent equipment from being over-maintained or under-maintained, and further improve equipment stability.

Fig. 2 shows a state test system for live detection of wind farm equipment according to an embodiment of the present invention, implementing a corresponding state test method, including the following subsystems:

(1) Live detection subsystem: including an ultraviolet imaging detector, as shown in Figure 10, and an ultrasonic partial discharge detector, as shown in Figure 9, through which two detectors collect data to effectively monitor the operating status of wind farm equipment , for fault detection and prevention;

(2) Condition-based maintenance decision-making subsystem: including data analyzers, internally implanted equipment status evaluation standards, collecting and analyzing equipment operation data through the information collection subsystem, and using data analyzers to carry out status evaluation work on equipment, so as to determine whether the equipment is Items that need to be overhauled and determined to be overhauled;

(3) Equipment pre-test maintenance subsystem: including the 35kV current collector line pre-test maintenance system and the booster station pre-test maintenance system, two of which include infrared thermal imagers and infrared thermometers for detection.

The terms and meanings involved in each state evaluation rule are as follows: (1) Typical fault tree: a model representing the causal relationship of typical equipment faults, which takes the least expected equipment fault state as the top event, and finds out the possible causes of this fault. The intermediate event of the direct cause of a fault state, until the bottom event of the cause that does not need to be decomposed; (2) Fault tree analysis method: it is a reliability analysis method based on the fault tree, which is used for qualitative and quantitative analysis of the fault tree. Finally, according to the obtained reliability indicators, such as the probability of top event occurrence, the importance of bottom event occurrence probability, etc., suggestions on the weak links of the equipment are given; (3) State quantity: various information data that directly or indirectly represent the state of the equipment; (4) General state quantities: state quantities that have little impact on equipment performance and safe operation; (5) Important state quantities: state quantities that have a greater impact on equipment performance and safe operation; (6) Normal state: equipment Each state quantity is stable and within the warning value and attention value stipulated in the regulations (hereinafter referred to as the limit value of the detailed rules), and can operate normally; (7) Attention state: the change trend of the individual (or multiple) state quantities of the equipment is approaching the limit value of the detailed rules It can continue to operate if it does not exceed the limit value of the detailed rules, and the monitoring during operation should be strengthened; (8) Abnormal state: the state quantity of a single item (or multiple items) of the equipment has changed greatly, and it has approached or slightly exceeded the limit value of the detailed rules. The operation should be monitored, and power outage maintenance should be arranged in a timely manner; (9) Serious state: the serious state quantity of a single item of equipment seriously exceeds the limit value of the detailed rules, and power outage maintenance needs to be arranged as soon as possible.

1. Detailed rules for the state evaluation of 35kv-220kv capacitive voltage transformers:

(1) Evaluation principle: The typical fault tree model analysis method is mainly used to design the evaluation items and content: (1) The typical fault tree model is established by referring to the fault tree analysis method, combining technical supervision experience, and summarizing the occurrence rules and characteristics of equipment faults (2) Refer to Figure 3 for the typical fault tree model of capacitive voltage transformers, the faults of capacitive voltage transformers include capacitor unit faults and electromagnetic unit faults; (3) analyze the bottom events of typical fault trees, and extract and characterize typical faults of equipment Types of characteristic state quantities, based on the characteristic state quantities, formulate a state evaluation table, and determine the health status and development trend of the equipment through the evaluation and scoring of the characteristic state quantities in the state evaluation table.

(2) State evaluation method: According to the degree of influence of the equipment state quantity on the health state of the capacitive voltage transformer, there are four weight levels of 1, 2, 3, and 4 from small to large. According to the severity of the deterioration of each state quantity, it is divided into four levels from light to heavy, corresponding to different scoring values, and the comprehensive state of the equipment (normal) can be evaluated by comprehensively analyzing the situation of each state quantity , Attention, Abnormal, Serious four states), Normal, Attention state can run normally, Attention state should strengthen operation monitoring, Abnormal state should be timely arranged for maintenance, Serious state should be arranged for maintenance as soon as possible.

(1) State quantity weight: depending on the degree of influence on the safe operation of the state quantity capacitive voltage transformer, it is divided into four grades from light to heavy, and the corresponding weights are weight 1, weight 2, weight 3, and weight 4, and their coefficients 1, 2, 3, 4. Weight 1 and weight 2 correspond to general state quantities, and weight 3 and weight 4 correspond to important state quantities.

(2) Deterioration degree of the state quantity: depending on the degree of deterioration of the state quantity, it is divided into four grades from light to heavy, respectively I, II, III and IV, and the corresponding basic deduction points are 2, 4, 8 and 10 points .

(3) State quantity deduction value: It is determined by the degree of deterioration of the state quantity and the weight, that is, the deduction value of the state quantity is equal to the actual deduction value of the state quantity multiplied by the weight coefficient, see Table 1-1, not for a certain If the status quantity is evaluated, no points will be deducted.

Table 1-1 State quantity state table

(4) Overall evaluation of capacitive voltage transformers: The evaluation of capacitive voltage transformers should consider the deduction of individual state quantities. See Table 2-1 for the detailed rules of state evaluation. When the point deduction reaches the normal state specified in Table 2-1 at the same time, it is regarded as a normal state; when the single point deduction of any state quantity and the total point deduction of all state quantities simultaneously meet the requirements of the attention state in Table 2-1, it is regarded as the attention state; when When the single deduction of any state quantity reaches the abnormal state or serious state specified in Table 2-1, it is regarded as abnormal state or serious state.

Table 2-1 Evaluation Rules for Capacitive Voltage Transformers

(5) The scoring standard for the state quantity of capacitive voltage transformer is that when the state quantity (especially multiple state quantities) changes and the cause of the change cannot be determined, analysis and diagnosis should be carried out to determine the cause of the abnormal state quantity and determine the deduction value; If the cause of the abnormal state quantity cannot be determined after diagnosis, the deduction value should be determined according to the most serious situation.

(3) Evaluation results:

(1) According to the evaluation results of transformers (reactors) (see Table 3-1), formulate different maintenance strategies. Normal operation can be carried out normally, and operation can continue in the attention state, but the monitoring during operation should be strengthened. Arrange maintenance in due course, and arrange maintenance as soon as possible in serious conditions.

Table 3-1

110kV～220kV Capacitive Voltage Transformer Status Evaluation Report

(2) According to the state evaluation results, the probability of equipment failure and equipment risk can be preliminarily analyzed, and the equipment failure probability and risk analysis can be carried out in detail and quantitatively.

(3) Through the analysis of the equipment status evaluation results, the possibility of equipment failure is preliminarily determined, and the short-term risk of equipment can be qualitatively analyzed in combination with the consequences of equipment accidents. Predict the bottom event that may occur in the fault tree through the state evaluation results; through the analysis and control of the bottom event, effectively prevent the occurrence of equipment accidents; seriously analyze the phenomenon of abnormal state quantities, and analyze the causes of abnormal state quantities to Components, devices, dielectric materials and other specific parts; according to the status evaluation results, formulate corresponding plans for equipment operation inspection, testing, maintenance, etc., see Table 4-1 and Table 5-1.

Table 4-1 Evaluation table of state quantity of capacitor voltage transformer

Table 5-1 Capacitive voltage transformer risk assessment data sheet

35kv-220kv lightning arrester state evaluation rules, 35kv-220kv current transformer state evaluation rules, 35kv-220kv SF6 high voltage switchgear state evaluation rules, 35kv-220kv isolating switch and grounding switch state evaluation rules, 35kv-220kv oil-immersed power transformer state evaluation rules The basic evaluation principle of the detailed rules is similar to that of capacitive voltage transformers, except that the evaluation items vary according to the type of wind farm equipment. The relevant tables for each wind farm equipment are listed below, and the contents involved in the table are detailed in the header.

2. For 35kv-220kv surge arrester state evaluation rules: See attached drawing 4 for the typical fault tree model of surge arrester.

Table 1-2 State quantity state table

Table 2-2 Correspondence between arrester component status and evaluation deduction points

Table 3-2 Arrester Status Evaluation Report

Table 4-2 Evaluation table of arrester state quantity

Table 5-2 Arrester Risk Assessment Data Sheet

3. Detailed rules for state evaluation of 35kv-220kv current transformers: Refer to attached drawing 5 for the typical fault tree model of current transformers, in which attached drawing 5-1 shows oil-immersed current transformers, and picture 5-2 shows SF ₆ type current transformers . Table 1-3 State quantity state table

Table 2-3 Correspondence between current transformer status and evaluation deduction points

Table 3-3 Current Transformer Status Evaluation Report

Table 4-3 Current Transformer State Quantity Evaluation Table

Table 5-3 Current Transformer Risk Assessment Data Sheet

4. Detailed rules for status evaluation of 35kv-220kv SF ₆ high-voltage switchgear: Refer to Figure 6 for the typical fault tree model of SF ₆ high-voltage switchgear.

Table 1-4 State quantity state table

Table 2-4 Correspondence table of high-voltage switchgear component status and evaluation deduction points

Table 3-4 High-voltage circuit breaker status evaluation report

Table 4 110kV～220kV GIS Equipment Status Evaluation Report

Table 4-4 High-voltage circuit breaker status evaluation table

Table 5-4 GIS Equipment Status Evaluation Form

Table 6-4 Risk assessment data sheet for circuit breakers and disconnectors

5. Detailed rules for status evaluation of 35kv-220kv isolating switch and grounding switch: Refer to attached drawing 7 for the typical fault tree model of isolating switch and grounding switch.

Figure 1-5 state quantity state table

Table 2-5 Corresponding table of state of isolation switch and grounding switch components and evaluation deduction points

Table 3-5 Status Evaluation Report of Isolating Switches and Earthing Switches

Table 4-5 Status Evaluation Form of Isolation Switch and Earthing Switch

Table 5-5 Risk Assessment Data Sheet for Disconnectors and Earthing Switches

6. Detailed rules for state evaluation of 35kv-220kv oil-immersed power transformer (reactor): Refer to attached drawing 8 for the typical fault tree model of oil-immersed power transformer (reactor), in which Figure 8-1 shows the total fault tree model, and Figure 8 -2 to 8-6 represent the decomposition diagram of A-F fault tree model respectively.

Table 1-6 State quantity state table

Table 2-6 Correspondence between transformer component status and evaluation deduction points

Table 3-6 State Evaluation Report of Oil-immersed Power Transformer (Reactor)

Table 4-6 State evaluation table of oil-immersed power transformer (reactor)

Table 5-6 Oil-immersed power transformer (reactor) risk assessment data sheet

For the preventive test of 35kv current collector line, the purpose of optimization is to discover hidden dangers in the operating equipment of 35kv current collector line in time, prevent equipment damage and ensure safe operation of equipment. The optimization basis for the preventive test of 35kv collector line is "North China Power Grid Co., Ltd. Power Equipment Handover and Preventive Test Regulations" 2008 edition, GB50150-2006 "Electrical Equipment Installation Engineering Electrical Equipment Handover Test Standard", "Inner Mongolia Electric Power Company Power Equipment Preventive Test Test Regulations" 2009 edition, "Inner Mongolia Electric Power Company Power Transmission and Transformation Equipment Condition Maintenance Test Regulations" 2013 edition, "Overhead Transmission Line Operation Regulations DLT741-2010". The optimization principle of the preventive test of 35kv collector line is (1) comprehensive analysis and judgment based on information such as 35kv collector line equipment inspection records, defect summary and routine test, on-line inspection, equipment family defects, and bad operating conditions; (2) ) For the power failure routine test, the reference period of 35kv and below equipment is 4 years. For the abnormalities that may endanger the safe operation of the equipment are not found in the inspection, the live monitoring equipment is in good condition, and the last routine test and the previous routine (handover) ) There is no obvious difference in the test results, there is no family defect that may endanger the safe operation of the equipment, and no serious adverse conditions have been experienced since the last routine test, the preventive test can be postponed for one year; (3) For one of the following situations equipment, preventive tests need to be arranged in advance or as soon as possible. The equipment is found to be abnormal during the inspection. The abnormality may be caused by major quality hazards. The live test shows that the equipment is not in good condition. The previous routine test has a clear trend towards the attention value or warning value or is close to the attention value or warning value. 1. The equipment has familial defects and has experienced serious adverse working conditions. It is impossible to determine whether it has substantial damage to the state of the equipment without testing; (4) If it is initially determined that there is a risk in the continued operation of the equipment, it should be Adjust the preventive test plan, shorten the test period, and exit the operation as soon as possible in serious cases, and conduct the test.

For this reason, according to the operating status of the 35kv collector line of the wind farm affiliated to Beijing Tianrun North China Branch, combined with the condition-based maintenance requirements, the following preventive test optimization measures are formulated:

(1) There are family defects in the third-phase box transformer of Damao Wind Farm. All test items should be carried out once a year. For other wind farms, 30% of each line is randomly inspected every year. The general test is completed in a 3-year cycle, and insulation resistance and DC resistance tests are carried out. Chromatographic test of insulating oil. Under similar operating and testing conditions, the routine test data, historical oil chromatography test data, and operating status of the box-type substation under the same batch and the same state of the same manufacturer are compared vertically and horizontally to find equipment rules, summarize experience, and further optimize preventive tests cycle.

(2) Other tests of box transformers, such as transformation ratio test and AC withstand voltage test, can be selectively carried out according to the operating status of the equipment. The AC withstand voltage test is a destructive test and should be carried out when a winding problem is suspected.

(3) According to the analysis of the operation status and the frequency of lightning strikes of Dashantai Wind Farm, Damao Wind Farm, Youyu Wind Farm, and Pinglu Yungaisi Wind Farm, the test period of the 35kv arrester for the above wind farms is 1 year, and the arrester for other wind farms The test period is 3 years. Focus on the lightning arrester for the overhead line of the iron tower. Through the analysis of the infrared temperature measurement data and routine test data of the arrester, predict the aging of the resistor or the internal moisture defect, adjust the test cycle in time for the arrester with bad operating conditions, and further judge through the power failure test The health status of the arrester requires that the test specifications and the test process should exclude the influence of corona and external insulation surface leakage current, ensure the accuracy of the test data, replace the arrester whose test data exceeds the requirements of the regulations in time, and summarize the deterioration law at the same time.

(4) 35kv cables should pay attention to infrared thermal imaging detection. Each wind farm adjusts the test cycle at any time according to the operating status of the cable, and conducts a withstand voltage test after replacing the cable head. During the inspection process, attention should also be paid to whether the cables are excessively bent, excessively stretched, externally damaged, soaked in rain, and poorly grounded.

(5) As the zero value detection rate of a certain batch of suspension insulators is significantly higher than the operating experience value, the zero value inspection period for this batch of insulators should be shortened as appropriate, and attention should be paid to insulators with flash traces, and the zero value should be checked in a timely manner. Insulators with high or low value should be replaced, and the insulation resistance test of the two tower insulators adjacent to the line tower where the lightning strike occurred, and recorded, to find the law of insulator degradation.

(6) The grounding resistance test of the grounding network of the wind turbine and the box substation is carried out once a year. The grounding resistance of the line iron tower and the pole tower can be tested in rounds, that is, a part of it is detected every year, and the general test is completed in 5 years. The site can control it by itself as appropriate, and transform the unqualified iron tower and pole tower ground network.

For the pre-test maintenance of the booster station, the purpose of the preventive test optimization of the booster station of the wind farm is to timely discover hidden dangers in the operating equipment of the booster station of the company's wind farm with a voltage level of 110kv and above, prevent equipment damage, and ensure the safe operation of the equipment. The operation status of the 110kv and above voltage level step-up station of the wind farm affiliated to Runhua North Branch, combined with the condition-based maintenance requirements, specially formulated the following preventive test optimization measures. The optimization basis for the preventive test of the wind farm booster station is "North China Power Grid Co., Ltd. Power Equipment Handover and Preventive Test Regulations" 2008 edition, GB50150-2006 "Electrical Equipment Handover Test Standard for Electrical Installation Engineering", "Inner Mongolia Electric Power Company Power Equipment Preventive Test 2009 edition, "Inner Mongolia Electric Power Company Power Transmission and Transformation Equipment Condition Maintenance Test Procedure" 2013 edition. The principle of preventive test optimization for booster stations in wind farms is as follows: (1) Based on information such as equipment inspection records, defect summaries, routine tests, online inspections, equipment family defects, and bad operating conditions of booster stations with 110kv and above voltage levels, Comprehensive analysis and judgment. (2) For the routine test of power outage, the reference period of 110kv and above equipment is 3 years; the reference period of 35kv and below equipment is 4 years. The base period is different, resulting in repeated power outages. When the high-voltage level equipment in the same substation reaches the power outage routine test period for testing, the low-voltage level equipment should be arranged to conduct routine tests at the same time as much as possible. Abnormal safe operation of equipment, live monitoring equipment in good condition, no significant difference between the results of the last routine test and the previous routine (handover) test, no family defects that may endanger the safe operation of the equipment, no experience of failure since the last routine test For serious adverse working conditions, the preventive test can be postponed for one year. (3) For equipment that meets one of the following conditions, preventive tests need to be arranged in advance or as soon as possible. The equipment is found to be abnormal during the inspection. The abnormality may be caused by major quality hazards. The live test shows that the equipment is not in good condition. The previous routine test has a clear trend towards the attention value or warning value or is close to the attention value or warning value. 1. The equipment has familial defects and has experienced serious adverse working conditions. It is impossible to determine whether it has substantial damage to the equipment status without testing. (4) If it is preliminarily determined that there is risk in the continued operation of the equipment, no matter whether it is due or not, the preventive test plan should be adjusted, the test period should be shortened, and the test should be withdrawn as soon as possible if the situation is serious.

For this reason, the preventive test optimization measures for the booster station of the wind farm in the embodiment are proposed to include:

(1) The surge arresters, current transformers, voltage transformers, vacuum circuit breakers, and overvoltage protectors with a voltage level of 35kv in the booster station, under similar operating and testing conditions, are routinely tested by the same manufacturer, the same batch, and the same state The data is compared horizontally and vertically in the operating state, looking for the law of equipment deterioration, summing up experience, and optimizing the preventive test cycle.

(2) For transformers, current transformers, capacitive voltage transformers, SF6 circuit breakers, outdoor high-voltage isolation switches, and lightning arresters with a voltage level of 110kv and above, the health status of the equipment should be comprehensively analyzed in combination with equipment inspection data and infrared thermal imaging monitoring data. Electrical equipment with bad working conditions should be paid special attention to;

(3) The grounding resistance test of the earth network of the step-up station shall be carried out every 6 years, and the conduction test of the earth network in the station shall be carried out every 3 years.

(4) The live test of 110kv and above surge arresters can replace the power failure test.

(5) SF6 gas leak detection test can be detected by infrared thermometer when the equipment is charged.

Through the adoption of equipment live detection research, promote the comprehensive live detection methods of ultrasonic partial discharge detection and ultraviolet imaging detection, analyze the equipment state according to the state evaluation rules, issue the equipment state evaluation analysis report, establish the maintenance pre-test implementation plan, optimize the test items, and save the pre-test Overhaul costs.

While the invention has been described with reference to certain illustrative embodiments, it is not to be limited by these embodiments but only by the appended claims. Those skilled in the art should understand that changes and modifications can be made to the embodiments of the present invention without departing from the protection scope and spirit of the present invention.

Claims (9)

1. A state test method for live detection of wind farm equipment, characterized in that it may further comprise the steps: (1) Live detection: collect data through instruments, implement live detection combined with ultrasonic partial discharge detection and ultraviolet imaging detection, so as to effectively monitor the operation status of wind farm equipment, and detect and prevent faults; (2) Construct a decision-making system for condition-based maintenance: by collecting and analyzing equipment operation data, carry out condition evaluation of equipment, so as to determine whether the equipment needs maintenance and determine the maintenance items; (3) Establish an optimization plan for equipment pre-test maintenance: through the condition maintenance of wind farm equipment, combined with the implementation of equipment live detection, evaluate the equipment status according to the wind farm equipment status evaluation rules, formulate customized maintenance strategies, extend the maintenance test period, and optimize Maintenance test items, so as to reduce maintenance test costs, prevent equipment from being over-maintained or under-maintained, and further improve equipment stability. 2. the state test method of a kind of wind farm equipment electrification detection according to claim 1, it is characterized in that described step (1) ultraviolet imaging detection carries out lateral comparison according to the ultraviolet image or the ultraviolet photon number counting of electrified equipment corona discharge Graphical observation and judgment and defect grading are carried out on abnormal corona properties, occurrence location and severity. 3. The state test method of a kind of wind farm equipment charging detection according to claim 1, it is characterized in that described step (1) ultrasonic partial discharge detection sends out when collecting power equipment and line partial discharge by non-contact ultrasonic sensor The acoustic signal in the range of 20kHz-200kHz detects the amplitude, phase, frequency, noise, etc. of the acoustic signal, as well as the relationship with the operating voltage, so as to reflect the degree of insulation defect of the equipment through the decibel dB value. 4. A state test method for live detection of wind farm equipment according to claim 3, characterized in that the decibel dB value ≥ 200 is a major defect. 5. the state test method of a kind of wind farm equipment charging detection according to claim 1, is characterized in that described step (2) comprises: (2-1) Set maintenance goals based on clarity, measurability, achievability, relevance and time limit, and obtain the ultimate goal of maintenance by determining comparison benchmarks; (2-2) Formulate maintenance decision-making plan according to time; (2-3) Use data collection tables, histograms, Pareto diagrams, fishbone diagrams, 5Why analysis, RCM analysis and PM analysis methods to determine the causes of repeated failures of wind farm equipment; (2-4) Use the histogram to track the data of the maintenance results; (2-5) Standardize maintenance decision-making plans according to CIL standards, SOP/WI standards, TBM/CBM standards, and Q/M matrix. 6. The state test method for live detection of wind farm equipment according to claim 5, characterized in that said step (2-2) includes: after the comprehensive detection of ultraviolet imaging and ultrasonic partial discharge, there is discharge to the equipment Abnormal, but will not cause accidents, generally recorded in the record, observe the development of defects; abnormal discharge of equipment, but will not cause accidents immediately, shorten the inspection cycle, power outage treatment; serious discharge of equipment, or affect the safe operation of equipment, It may cause accidents in the short term, so arrange a power outage as soon as possible. Through the analysis of the live detection data, the effective monitoring of the live running status of the equipment can be achieved. 7. The state test method for live detection of a kind of wind farm equipment according to claim 1, characterized in that said step (3) detailed rules for status evaluation of wind farm equipment include: 35kv-220kv capacitive voltage transformer state evaluation rules, 35kv-220kv surge arrester state evaluation rules, 35kv-220kv current transformer state evaluation rules, 35kv-220kv SF6 high voltage switchgear state evaluation rules, 35kv-220kv isolating switch and grounding switch state evaluation rules, 35kv-220kv oil-immersed power transformer state evaluation rules fine print. 8. The state test method for live detection of wind farm equipment according to claim 1, characterized in that said step (3) equipment pre-test maintenance includes: 35kV collector line pre-test maintenance and booster station pre-test maintenance . 9. A state test system for live detection of wind farm equipment, used to implement the state test method for live detection of wind farm equipment according to any one of claims 1-8, characterized in that the system includes the following subsystems: (1) Live detection subsystem: including ultraviolet imaging detector and ultrasonic partial discharge detector, collect data through two detectors, so as to effectively monitor the operation status of wind farm equipment, and detect and prevent faults; (2) Condition-based maintenance decision-making subsystem: including data analyzers, internally implanted equipment status evaluation standards, collecting and analyzing equipment operation data through the information collection subsystem, and using data analyzers to carry out status evaluation work on equipment, so as to determine whether the equipment is Items that need to be overhauled and determined to be overhauled; (3) Equipment pre-test maintenance subsystem: including the 35kV current collector line pre-test maintenance system and the booster station pre-test maintenance system, two of which include infrared thermal imagers and infrared thermometers for detection.