CN113487044A - Large hydroelectric generator set maintenance plan manufacturing method - Google Patents
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Abstract
A method for manufacturing a maintenance plan of a large hydroelectric generating set comprises the following steps: the method comprises the following steps: classifying large hydroelectric generating set equipment; step two: registering and improving equipment defect information; step three: establishing a fault tree, carrying out standard description on the generated faults and setting a code uniquely corresponding to the faults; step four: standardizing the result description after the defective equipment is processed, and ensuring the determined processing result to be real and reliable; step five: performing statistical analysis on the defect data processed according to the first step, the fourth step and the fourth step, and forming diagnosis analysis reports of the operation life, the maintenance time and the like of the equipment under different environments according to the statistical result; step six: and determining preventive replacement of the equipment or maintenance plan of the equipment according to the evaluated influence degree of the equipment on the unit and the requirement of the maintenance process, and comparing the planned maintenance time of the equipment.
Description
Technical Field
The invention belongs to the technical field of power equipment maintenance, and particularly relates to a method for manufacturing a maintenance plan of a large hydroelectric generator set.
Background
At present, the unit overhaul of the hydroelectric power plant comprises A overhaul, B overhaul, C overhaul and D overhaul, the unit overhaul plan is compiled according to the hydropower station equipment facility overhaul guide rule, the unit is subjected to the A overhaul once every 8 to 10 years, the unit is subjected to the B overhaul once between two times of the A overhaul, and the unit is subjected to the C overhaul or the D overhaul once from half a year to one year.
The following disadvantages have been gradually exposed depending on the planned overhaul:
firstly, the service life of the equipment is influenced by excessive or insufficient maintenance;
secondly, the maintenance cost is increased, and the use efficiency of the equipment is not high due to the overlong equipment outage time;
and thirdly, under the planned maintenance mode, regardless of the defect state of the equipment, the equipment is necessary to be repaired due to due time, the thought of personnel is easy to be relaxed, the technology is not in a stagnation state, and the progress of the technology management work is slow.
Disclosure of Invention
The invention aims to realize the accuracy of a maintenance plan, and provides a large hydroelectric generating set maintenance plan manufacturing method which can get rid of a technical route of improving the quality of maintenance plan formulation by completely depending on upgrading detection technology and equipment and can organically combine the maintenance plan obtained by analyzing the planned maintenance and defect big data.
A method for manufacturing a maintenance plan of a large hydroelectric generating set comprises the following steps:
the method comprises the following steps: classifying large hydroelectric generating set equipment;
step two: registering and improving equipment defect information;
step three: establishing a fault tree, carrying out standard description on the generated faults and setting a code uniquely corresponding to the faults;
step four: standardizing the result description after the defective equipment is processed, and ensuring the determined processing result to be real and reliable;
step five: performing statistical analysis on the defect data processed according to the first to fourth steps;
step six: acquiring the first failure time and the first failure frequency of the equipment according to the statistical result;
step seven: taking the median value of the failure frequency and time as the actual operation life of the part installation position;
step eight: according to the service life of the equipment, combining equipment near the service life to be evaluated with an equipment maintenance guide rule, making a maintenance plan, adopting preventive replacement for parts convenient to replace, and preferentially maintaining the listed overhaul plan of large equipment which is difficult to replace and needs to be disassembled;
step nine: the real loss condition of the equipment is evaluated according to the maintenance result, if the state of the disassembled equipment is good, the evaluation time can be prolonged according to the wear rule, and if the maintenance equipment is seriously worn, the evaluation time can be shortened according to the wear rule;
step ten: and obtaining the actual service life of the equipment installation environment according to the maintenance wear rule of the similar equipment.
In the first step, according to the principle of taking account of statistics and analysis and management, the large hydroelectric generator set equipment is divided into one of a GIS system, an excitation system, a generator-transformer protection system, a generator and auxiliary equipment thereof, a water turbine and auxiliary equipment thereof, a speed regulation system, a rapid door system, a plant alternating current system, a direct current system and a technical water supply system.
The GIS system is divided into primary equipment, secondary equipment and protection;
the primary equipment is divided into a switch, an isolation disconnecting link, a grounding switch, a reactor, a GIS compartment and a mutual inductor;
the secondary equipment is divided into a power switch, a relay and a measuring device;
the protection is divided into switch protection and line protection;
the excitation system is divided into an excitation transformer, an excitation regulator cabinet, a power cabinet, a de-excitation device, an electric braking device, an excitation starting device and a protection device;
the generator-transformer group protection system comprises generator protection and main transformer protection;
the generator and auxiliary equipment thereof are divided into a stator, a rotor, a neutral point grounding transformer, a closed bus, a cooling system, a three-part bearing system, an air brake, a high-pressure oil system, a heater and an oil mist absorption device;
the water turbine and the auxiliary equipment thereof are divided into a water diversion part, a water guide mechanism, a rotating wheel, a draft tube, a top cover drainage system, a main shaft sealing system, a maintenance sealing system and a large shaft air supply system;
the speed regulating system is divided into an electrical part and a mechanical part, wherein the electrical part is divided into a speed regulator electrical cabinet, a speed regulator control cabinet, an oil collecting tank auxiliary control box and a pressure oil pump control box;
the mechanical part is divided into a speed regulator mechanical hydraulic part and comprises an oil pump motor set, an oil pressure tank, an isolation valve, an oil collecting tank, an electro-hydraulic conversion unit, a main pressure distribution valve, a pressure sensor, mechanical overspeed protection, a guide vane servomotor position feedback sensor, guide vane section closing, a guide vane servomotor, a locking spindle and a fluted disc speed measuring device;
the rapid door system is divided into an electric control system, a hydraulic system and an arc door;
the factory alternating current system is divided into a 35kV system, a 10kV system and a 0.4kV system;
the direct current system is divided into a unit direct current power supply system, a public direct current power supply system, a GIS direct current power supply system, a drain gate direct current power supply system, a quick door direct current power supply system, a 48V line optical fiber interface equipment direct current power supply system, a UPS direct current power supply system and an EPS direct current power supply system;
the technical water supply system comprises a pressure reducing valve system, an electric butterfly valve, a manual valve, a pressure maintaining and releasing valve and a water filter system.
In the second step, when the equipment generates a defect, the brand of the defect, the initial installation time, the time of failure, the ambient temperature of the equipment installation, the ambient humidity of the equipment installation and the vibration condition of the equipment installation need to be registered at the same time.
The vibration conditions include three levels, the first level being quiet (0 to 40 decibels), the second level being quiet (40 to 60 decibels), and the third level being loud (60 to 100 decibels).
When the evaluation time is less than the maintenance schedule time, arranging an equipment maintenance schedule according to the evaluation time; when the evaluation time is longer than the scheduled maintenance time, one unit of the same type can be scheduled to perform verification maintenance according to the scheduled maintenance time; if the verification result is in accordance with the expectation, the scheduled maintenance time is revised as the evaluation time, if the verification evaluation time has deviation, the scheduled maintenance is firstly carried out, the reason of the deviation of the diagnosis result is searched, the diagnosis technology is corrected, and the evaluation maintenance time is perfected.
Compared with the prior art, the invention has the following technical effects:
according to the invention, a state maintenance conclusion obtained by multi-dimensional strong relevant information of equipment defects through an intelligent analysis method is organically combined with the scheduled maintenance, the maintenance schedule is flexibly arranged through the obtained defect rules of familial, periodic, seasonal equipment and the like, and the defects of the traditional scheduled maintenance can be effectively overcome;
meanwhile, the invention can also avoid the defect of poor reliability of state maintenance in the prior art, realize the improvement of the service cycle and the service efficiency of the equipment and reduce the maintenance cost.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a flow chart of the present invention.
Detailed Description
As shown in fig. 1, a method for making a large hydroelectric generating set maintenance plan comprises the following steps:
the first step is as follows: the large hydroelectric generating set equipment can be divided into a GIS system, an excitation system, a generator-transformer protection system, a generator and auxiliary equipment thereof, a water turbine and auxiliary equipment thereof, a speed regulation system, a rapid door system, a plant alternating current system, a direct current system and a technical water supply system according to the principle of facilitating statistics, analysis and management.
The GIS system comprises primary equipment, secondary equipment and protection, wherein the primary equipment comprises a switch, an isolation disconnecting link, a grounding switch, a reactor, a GIS compartment and a mutual inductor, the secondary equipment comprises a power switch, a relay and a measuring device, and the protection comprises switch protection and line protection; the excitation system is divided into an excitation transformer, an excitation regulator cabinet, a power cabinet, a field suppression device, an electric brake device, an excitation starting device and a protection device, the generation and transformation group protection system is divided into a generator protection and a main transformer protection, the generator and auxiliary equipment thereof are divided into a stator, a rotor, a neutral point grounding transformer, a closed bus, a cooling system, a three-part bearing system, an air brake, a high-pressure oil system, a heater and an oil mist absorption device, the water turbine and the auxiliary equipment thereof are divided into a water diversion part, a water diversion mechanism, a rotating wheel, a tail water pipe, a top cover drainage system, a main shaft sealing system, an overhaul sealing system and a large shaft air supply system, the speed regulation system is divided into an electric part and a mechanical part, the electric part is divided into a speed regulator cabinet, a speed regulator control cabinet, an oil collecting tank auxiliary control box and a pressure oil pump control box, the mechanical part is divided into a speed regulator mechanical hydraulic part and a mechanical hydraulic part, The device comprises a pressure oil tank, an isolation valve, an oil collecting tank, an electro-hydraulic conversion unit, a main pressure distribution valve, a pressure sensor, mechanical overspeed protection, a guide vane servomotor position feedback sensor, guide vane section closing, a guide vane servomotor, a locking spindle and a fluted disc speed measuring device; the rapid door system is divided into an electric control system, a hydraulic system and an arc door, the factory alternating current system is divided into a 35kV system, a 10kV system and a 0.4kV system, and the direct current system is divided into a unit direct current power supply system, a public direct current power supply system, a GIS direct current power supply system, a drain gate direct current power supply system, a rapid door direct current power supply system, a 48V line optical fiber interface equipment direct current power supply system, a UPS direct current power supply system and an EPS direct current power supply system; the technical water supply system comprises a pressure reducing valve system, an electric butterfly valve, a manual valve, a pressure maintaining and releasing valve and a water filter system.
The second step is that: and registering perfect equipment defect information. When the equipment generates defects, the brand of the defects, the initial installation time, the time of failure, the ambient temperature of equipment installation, the ambient humidity of equipment installation and the vibration condition of the equipment installation are required to be registered at the same time (the vibration condition is divided into three levels, the first level is quiet (0-40 decibels), the second level is slight noise (40-60 decibels), and the third level is relatively loud noise (60-100 decibels).
The third step: establishing a fault tree, carrying out specification description on the generated faults and setting a code corresponding to the fault tree uniquely, wherein in view of the actual condition of the power station, the code can completely meet the requirement by taking 6 bits, and the code can be modified and adjusted according to the actual condition; as an implementable, the following coding is now provided:
000001 voltage abnormality, 000002 current abnormality, 000003 temperature abnormality, 000004 power failure, 000005 grid connection failure, 000006 insurance damage, 000007 insulation failure, 000008 partial discharge, 000009 display abnormality, 000010 slipping load, 000011 distant refusal, 000012 present refusal, 000013 pressure abnormality, 000014 flow abnormality, 000015 cabinet door damage, 000016 water leakage, 000017 air leakage, 000018 oil leakage, 000019 liquid level abnormality, 000020 watt temperature abnormality, 000021 abnormal sound, 000022 ignition, 000023 function abnormality, 000024 communication abnormality, 000025 dead halt, 000026 deterioration, 000027 vibration exceeding standard, 000028 software alarm, 000029 hardware alarm, 000030 false operation, 000031 differential pressure exceeding, 000032 abnormality, 000033 fan failure, 000034 grounding, 000035 card, 000036 loosening, 000037 deformation, 000038 discoloration, 000039 excessive accumulation of toner, 000040 abnormality, 000041 reactive anomalies;
device defects if there are multiple phenomena, multiple fault descriptions may be selected. The coding is mainly used for facilitating big data statistics through a computer.
The fourth step: and standardizing the result description after the defective equipment is processed, so as to ensure that the identified processing result is real and reliable.
The fifth step: and performing statistical analysis on the defect data processed according to the first step, the fourth step and the fourth step, and forming diagnosis analysis reports of the service life, the maintenance time and the like of the equipment in different environments according to the statistical result.
And a sixth step: and determining a preventive replacement or maintenance plan of the equipment by combining the evaluated influence degree of the equipment on the unit and the overhaul process requirement, then comparing the planned overhaul time of the equipment, when the evaluation time is less than the overhaul plan time, arranging the equipment overhaul plan according to the evaluation time, when the evaluation time is more than the planned overhaul time, arranging the same type of unit to carry out verification overhaul according to the planned overhaul time, if the verification result is in accordance with expectation, revising the planned overhaul time as the evaluation time, if the verification evaluation time has deviation, firstly carrying out the maintenance according to the plan, searching the reason of the deviation of the diagnosis result, revising the diagnosis technology, and perfecting the evaluation of the overhaul time.
In consideration of the actual conditions of the existing large hydroelectric generating set, the classification is based on a vertical shaft semi-umbrella type and semi-water cooling type salient pole generator and a mixed flow water turbine.
The invention provides a method for manufacturing a maintenance plan of a large hydroelectric generating set, which develops a new way, gets rid of a technical route of improving the quality of the maintenance plan by completely depending on upgrading detection technology and equipment, and realizes the accuracy of the maintenance plan by organically combining the maintenance plan obtained by analyzing the planned maintenance and defect big data.
Claims (6)
1. A method for manufacturing a large hydroelectric generating set maintenance plan is characterized by comprising the following steps:
the method comprises the following steps: classifying large hydroelectric generating set equipment;
step two: registering and improving equipment defect information;
step three: establishing a fault tree, carrying out standard description on the generated faults and setting a code uniquely corresponding to the faults;
step four: standardizing the result description after the defective equipment is processed, and ensuring the determined processing result to be real and reliable;
step five: counting the defect data processed according to the first to fourth steps;
step six: acquiring the first failure time and the first failure frequency of the equipment according to the statistical result;
step seven: taking the median value of the failure frequency and time as the actual operation life of the part installation position;
step eight: according to the service life of the equipment, combining equipment near the service life to be evaluated with an equipment maintenance guide rule, making a maintenance plan, adopting preventive replacement for parts convenient to replace, and preferentially maintaining the listed overhaul plan of large equipment which is difficult to replace and needs to be disassembled;
step nine: the real loss condition of the equipment is evaluated according to the maintenance result, if the state of the disassembled equipment is good, the evaluation time can be prolonged according to the wear rule, and if the maintenance equipment is seriously worn, the evaluation time can be shortened according to the wear rule;
step ten: and obtaining the actual service life of the equipment installation environment according to the maintenance wear rule of the similar equipment.
2. The method for making the overhaul plan of the large hydroelectric generating set according to claim 1, wherein in the step one, the large hydroelectric generating set equipment is divided into one of a GIS system, an excitation system, a generator and auxiliary equipment thereof, a water turbine and auxiliary equipment thereof, a speed regulation system, a rapid door system, a plant AC system, a DC system and a technical water supply system.
3. The method for making the maintenance plan of the large hydroelectric generating set according to claim 2, wherein the GIS system is divided into primary equipment, secondary equipment and protection;
the primary equipment is divided into a switch, an isolation disconnecting link, a grounding switch, a reactor, a GIS compartment and a mutual inductor;
the secondary equipment is divided into a power switch, a relay and a measuring device;
the protection is divided into switch protection and line protection;
the excitation system is divided into an excitation transformer, an excitation regulator cabinet, a power cabinet, a de-excitation device, an electric braking device, an excitation starting device and a protection device;
the generator-transformer group protection system comprises generator protection and main transformer protection;
the generator and auxiliary equipment thereof are divided into a stator, a rotor, a neutral point grounding transformer, a closed bus, a cooling system, a three-part bearing system, an air brake, a high-pressure oil system, a heater and an oil mist absorption device;
the water turbine and the auxiliary equipment thereof are divided into a water diversion part, a water guide mechanism, a rotating wheel, a draft tube, a top cover drainage system, a main shaft sealing system, a maintenance sealing system and a large shaft air supply system;
the speed regulating system is divided into an electrical part and a mechanical part, wherein the electrical part is divided into a speed regulator electrical cabinet, a speed regulator control cabinet, an oil collecting tank auxiliary control box and a pressure oil pump control box;
the mechanical part is divided into a speed regulator mechanical hydraulic part and comprises an oil pump motor set, an oil pressure tank, an isolation valve, an oil collecting tank, an electro-hydraulic conversion unit, a main pressure distribution valve, a pressure sensor, mechanical overspeed protection, a guide vane servomotor position feedback sensor, guide vane section closing, a guide vane servomotor, a locking spindle and a fluted disc speed measuring device;
the rapid door system is divided into an electric control system, a hydraulic system and an arc door;
the factory alternating current system is divided into a 35kV system, a 10kV system and a 0.4kV system;
the direct current system is divided into a unit direct current power supply system, a public direct current power supply system, a GIS direct current power supply system, a drain gate direct current power supply system, a quick door direct current power supply system, a 48V line optical fiber interface equipment direct current power supply system, a UPS direct current power supply system and an EPS direct current power supply system;
the technical water supply system comprises a pressure reducing valve system, an electric butterfly valve, a manual valve, a pressure maintaining and releasing valve and a water filter system.
4. The method for making the overhaul plan of the large hydroelectric generating set according to claim 1, wherein in the second step, when the equipment has a defect, the brand of the defect, the initial installation time, the time of failure, the ambient temperature of the equipment installation, the ambient humidity of the equipment installation and the vibration condition of the equipment installation need to be registered at the same time.
5. A large hydro-generator set service plan making method according to claim 4, wherein the vibration conditions include three levels, the first level quiet (0 to 40 dB), the second level quiet (40 to 60 dB), and the third level loud (60 to 100 dB).
6. The large hydroelectric generating set service plan generating method according to any one of claims 1 to 5, wherein when the evaluation time is less than the service plan time, the equipment service plan is arranged according to the evaluation time; when the evaluation time is longer than the scheduled maintenance time, one unit of the same type can be scheduled to perform verification maintenance according to the scheduled maintenance time; if the verification result is in accordance with the expectation, the scheduled maintenance time is revised as the evaluation time, if the verification evaluation time has deviation, the scheduled maintenance is firstly carried out, the reason of the deviation of the diagnosis result is searched, the diagnosis technology is corrected, and the evaluation maintenance time is perfected.
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| CN110866695A (en) * | 2019-11-15 | 2020-03-06 | 国网天津市电力公司 | Auxiliary maintenance decision method based on association of equipment running state and maintenance work |
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