CN114217652A - Automatic control method for processing insulation oil of extra-high voltage converter station - Google Patents
Automatic control method for processing insulation oil of extra-high voltage converter station Download PDFInfo
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Abstract
The invention provides an automatic control method for the treatment of insulating oil of an extra-high voltage converter station, which realizes the full-automatic control of all-sealed oil filtering, vacuum oil feeding, transformer circulating oil filtering and other working sections of an insulating oil treatment device of the extra-high voltage converter station. Firstly, judging whether electrical equipment such as each power supply, valves and the like is normal, if not, directly alarming and quitting the program, and if so, starting full-sealed oil filtering. According to the invention, the manpower requirement is reduced, the working efficiency is improved, and the reliability and the safety of the equipment are ensured.
Description
Technical Field
The invention relates to the field of automatic control, in particular to an automatic control method for processing insulation oil of an extra-high voltage converter station.
Background
The transformer is the heart of a power system, but with the use of the transformer, the insulating oil is degraded, pollutants such as resin, aldehyde ketone, colloidal substances, carbon, organic acid, salt, water, metal chips and the like are generated, and the operation safety of the transformer is directly threatened by the polluted transformer oil. Through on-line monitoring insulating oil, when the content of pollutants in the oil is found to exceed the standard, the oil purification system automatically acts, and the purified insulating oil is subjected to composition analysis, so that impurities in the transformer oil can be removed in time, the safe and normal operation of the transformer is ensured, and the transformer oil reaches safe operation indexes. The transformer oil is filtered and purified to reach the reuse standard and then is injected into an oil tank or a transformer.
However, in the existing insulating oil treatment device of the extra-high voltage converter station, the whole oil filtering process of a circulating oil filtering and oil feeding system needs manual participation to carry out necessary measurement and control work such as opening and closing of a hand valve, adjustment of a control valve, measurement of oil body data and the like. Manual participation results in lower efficiency of the oil filtration system and poor reliability of manual control and data measurement. The requirement of the transformer circulating oil filtration on the oil filtration system cannot be met. Through the circulation oil filtering and purification, the cleanliness of the oil can be improved to be below 0.001% of solid impurities in the operation, the operation is simpler, and the oil filtering cost is lower. Therefore, it is necessary to realize automatic control of the working sections of oil filtering, vacuum oil feeding, transformer circulating oil filtering and the like of the insulating oil of the transformer in the special transformer, so that the automation level, the operation stability and the working efficiency are improved.
The multiple links of the process need to be manually monitored and operated, the process is complicated, the working efficiency is not high, and the reliability and the safety of the equipment have certain problems. Therefore, there is a need in the related art to seek a more sophisticated control method to solve this practical problem.
Disclosure of Invention
The invention aims to provide an automatic control method for the treatment of the insulating oil of the extra-high voltage converter station aiming at the defects of the prior art, and the full-automatic control of each working section is realized.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides an automatic control method for processing insulation oil of an extra-high voltage converter station, which comprises the following steps:
s1, judging whether each power supply and valve electrical equipment is normal; if not, directly alarming and exiting the program; if the oil is normal, the oil is filtered in a full-sealed mode;
s2, after the full-sealed oil filtering is finished, judging whether the data parameters of the pressure resistance value, the micro water content, the gas content, the dielectric loss and the granularity of the oil body are normal, and if not, continuing the full-sealed oil filtering program; if the oil is normal, performing a vacuum oil inlet flow;
s3, when the preset oil inlet total amount or liquid level height data is reached to the expected value, the vacuum oil inlet process is ended;
s4, after the vacuum oil inlet is finished, performing a transformer circulating oil filtering program, and setting circulating oil filtering time and temperature; if yes, detecting a transformer circulating oil filtering program, and setting the circulating oil filtering time and temperature; if yes, detecting whether relevant parameters of the transformer circulating oil filter are qualified; if the program is qualified, the program is exited; if the oil is not qualified, the full-sealed oil filtering is restarted.
Further, the controller judges whether the power supply is normal, the valve switch position is normal, the vacuum oil level is normal, the steam-water separator has oil, and the oil filter has a fault signal or not through the state quantity and the switching quantity input by the sensor element controller.
Further, after all the oil is normal, an oil filtering program is automatically started; if the fault exists, the machine is temporarily stopped and an alarm is given to a worker, and the worker removes the fault and then transmits power to continue the next process;
after the oil filtering process is started, the on-off quantity of the valve feeds back the state of the outlet delay switch or the state of the outlet delay switch which is not switched on, and feeds back alarm information to a worker, and whether the oil filtering process is suspended or not is selected according to programming.
Further, after the filtered insulating oil flows into the empty tank, the monitoring device monitors the liquid level of the insulating oil, switches the oil tank closing valve when the liquid level of the insulating oil reaches the preset liquid level height, switches the oil tank to repeat the process until all the tank bodies are full, and the full-sealed oil filtering process is finished.
Further, after the confirmation system sends a signal for completing vacuum oil filtering, a signal for detecting whether the oil sample is qualified or not by the oil tank bottom sensor and a signal for judging whether the state quantity of the oil filter has a fault, opening a corresponding valve according to a preset oil inlet quantity; starting an oil inlet flow of the No. N tank body, the oil filter and the transformer;
during the oil inlet process, all signals are monitored in real time, and when abnormality occurs, the system automatically pauses and gives an alarm to workers;
and after the preset oil inlet total amount is reached or the liquid level height data observed by a worker reaches a preset value, automatically or manually finishing the vacuum oil inlet flow.
Furthermore, the oil filtering time and the temperature of the transformers of different models are different, the parameters of the oil filtering time and the temperature of the transformers of different models are preset in the system, and the models are directly selected in the system when the transformers are circularly filtered.
Further, after the system sends a vacuum oil filtering flow completion signal and an oil filter state quantity normal signal, the system opens a corresponding valve according to preset circulating oil filtering time and temperature setting to start a circulating oil filtering process;
after the set temperature value is reached, counting down according to set time is started, circulating oil filtering is carried out, after the counting down is finished, the outlet valve of the transformer is closed, oil inlet of the transformer is completed, the oil filter is stopped, and all valves are closed.
The invention has the beneficial effects that: the labor requirement is reduced, the working efficiency is improved, the reliability and the safety of equipment are guaranteed, and the method has good engineering application value.
Drawings
FIG. 1 is a general oil filtration flow diagram of the present invention;
FIG. 2 is a flow diagram of the present invention for fully sealed oil filtration;
FIG. 3 is a vacuum oil intake flow diagram of the present invention;
fig. 4 is a flow chart of the circulating oil filtering of the transformer of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The original manual valve is changed into an electric control cut-off valve at the inlet and outlet of the oil tank, the cut-off valve is controlled to be switched on and off more quickly, and the safety performance is better. The controller of the automatic control system controls the opening and closing of the valve, so that the requirement of manpower is reduced, and the safety and the reliability of the oil filtering system are improved. The measurement and record of data parameters such as pressure resistance, micro water, gas content, dielectric loss, granularity and the like which are originally required to the right side in the tank body are manually measured and recorded, and the automatic measurement is realized by additionally installing a sensor and monitoring equipment. And then, data are transmitted to the controller through digital-to-analog conversion, a program is written into the controller, the controller judges the current working state, and a next working instruction is sent to the oil filtering system.
The flow and flow speed monitoring and control between the oil tank-transformer and the oil tank-oil filter are carried out by using a flowmeter and a liquid level meter to obtain information and using a controller to carry out flow control. The automatic flow rate control system has the advantages that the former manual working mode of the experimental type is replaced by the automatic working mode of strictly controlling the flow rate according to the standard, the system is more stable and accurate to operate through data, the reliability of the system is improved, and the working efficiency is improved.
And (4) according to the improved oil filtering system, carrying out matched monitoring equipment and software function design. The additionally arranged and modified sensor and valve transmit the working state information to the controller through digital-analog conversion, and the controller controls the vacuum pump, the oil pump and the transmission motor through a preset control program to control the oil filtering system to carry out oil filtering, oil feeding and circulating oil filtering processes. The measured data and the working state of the oil filtering system can be displayed on the monitoring equipment in real time through the display module, when a certain data is in a problem, the system can remind a worker to solve the problem in time through the alarm function module, and whether the current oil filtering process is suspended or not can be selected in a controllable mode.
By the conception, the automatic oil filtering system can realize machine end direct control, remote manual computer control and full-automatic control. The improved automatic system has the capability of monitoring each working state and insulating oil parameters of the oil filtering system, and displays each data at a monitoring computer. The working state of the oil filtering system can be monitored by auxiliary workers. Compared with the original manual work of observing each instrument, the oil body data of each oil tank is measured, the improved system can more efficiently observe each data, and the automatic oil filtering system can automatically execute corresponding sub-processes according to the data. The staff also can intervene the control flow manually, let oil strain system carry out oil strain or oil feed flow according to the instruction that the manual work gave.
Preferably, the overall oil filtering process is as shown in fig. 1, and first, whether electrical equipment such as power supplies and valves is normal is judged, if not, the process is directly alarmed and quitted, and if yes, full-sealed oil filtering is started. After the fully-sealed oil filtering is finished, whether data parameters such as a pressure resistance value, micro water, an air content, dielectric loss and granularity of an oil body are normal or not is judged, if not, the fully-sealed oil filtering program is continued, if so, a vacuum oil inlet flow is carried out, and when the preset oil inlet total amount or liquid level height data is reached to an expected value, the vacuum oil inlet flow can be finished fully automatically. After the vacuum oil inlet is finished, a transformer circulating oil filtering program is carried out, circulating oil filtering time and temperature are set, whether relevant parameters of transformer circulating oil filtering are qualified or not is detected, if the relevant parameters are qualified, the program is quitted, and if the relevant parameters are not qualified, full-sealed oil filtering is restarted.
Preferably, the fully-sealed oil filtering process is as shown in fig. 2, the oil filter is powered on, self-checking is performed, if an abnormal system interface exists, a window pops up to inform an abnormal problem point, meanwhile, a scene audible and visual alarm gives an alarm, the system is not started, and abnormal investigation is performed manually according to prompts. Eliminating abnormality, completing self-checking, starting program, automatically starting a vacuum pump to work, detecting a pressure value by a remote pressure transmitter in a vacuum tank, when the pressure value in the vacuum tank reaches 2000Pa, automatically starting a booster pump, and when the pressure value reaches 20-40Pa after the booster pump is started, opening a V1 valve (an original manual valve is changed into a self-control valve), opening an electric valve at the inlet of a 1# tank (additional installation), starting an oil inlet pump, starting a heater 1-5, enabling the liquid level of the vacuum tank to be more than or equal to 50%, opening a V3 valve (an original manual valve is changed into a self-control valve), starting an oil outlet pump, detecting the temperature of an oil storage tank by a temperature transmitter, closing a V3 valve, opening a V2 valve (an original manual valve is changed into a self-control valve), detecting the flow rate and flow rate by an additionally installed mass flowmeter, controlling the oil flow rate by adjusting a frequency converter, opening an electric valve at the inlet of the vacuum tank (additional installation), an intelligent remote transmission liquid level meter is additionally arranged on each tank, when the liquid level of an empty tank is more than or equal to 2200mm, a V1 valve and a V2 valve of an oil filter are closed, a V4 valve (an original manual valve is changed into an automatic control valve) and a V5 valve (an original manual valve is changed into an automatic control valve) are opened, the back filtration is started, when the liquid level of a 1# tank is more than or equal to 2200mm, the liquid level of a colleague empty tank reaches 0, an electric valve at the inlet of the 1# tank is closed, the V4 valve and the V5 valve of the oil filter are closed, and the V1 valve and the V2 valve are opened. (the number of times of oil filtering is set on the operation interface according to the requirement). Opening an electric valve at the inlet of a No. 2 tank (additionally mounted), opening an electric valve at the inlet of an empty tank, closing a V1 valve and a V2 valve of an oil filter, opening a V4 valve and a V5 valve when the liquid level of the empty tank is more than or equal to 2200mm, starting to perform back filtration, closing an electric valve at the inlet of the No. 2 tank (additionally mounted), closing a V4 valve and a V5 valve of the oil filter, opening a V1 valve and a V2 valve, opening an electric valve of the No. 3 tank (additionally mounted), completing oil filtration of the No. 7 tank in sequence, closing the electric valve at the inlet of the empty tank, closing a vacuum pump and a booster pump, closing an inlet pump and an outlet pump, and closing the V1 valve and the V2 valve. And (4) manually sampling and analyzing the quality of the oil product, judging whether the oil product is qualified or not, if the oil product is unqualified, repeating the oil filtering process, and if the oil product is qualified, starting the next process.
As shown in fig. 3, a vacuum pump is started to work, the pressure of a vacuum tank reaches 2000Pa, a booster pump is started, when the pressure reaches 20-40Pa, a V1 valve is opened, a 1# tank inlet electric valve is opened, an oil inlet pump is started, a heater 1-5 is started, the liquid level of the vacuum tank is greater than or equal to 50%, a V3 valve is opened, an outlet oil pump is started, the temperature reaches a set value (60 ℃), a V3 valve is closed, a V2 valve is opened, a transformer inlet electric valve is opened, when the liquid level of a 1# tank is less than or equal to 0, a 2# tank electric valve is opened, when the liquid level of a 2# tank is less than or equal to 0, a 3# tank electric valve is opened, when the liquid level of a 7# tank is less than or equal to 0 or after the set flow rate is reached, the vacuum pump, the booster pump, the inlet pump and the outlet pump are closed, and the V1 valve and the V2 valve are closed.
The transformer circulating oil filtering process is as shown in fig. 4, an electric valve at an inlet and an outlet of a transformer is opened, circulating oil filtering time is set through a time relay, effective oil filtering temperature is set in advance, effective oil filtering time is calculated when the set temperature is 60 ℃, a vacuum pump is started to work, the pressure of a vacuum tank reaches 2000Pa, a booster pump is started, when the pressure reaches 20-40Pa, a valve V1 is opened, an electric valve at an inlet of a tank 1 is opened, an oil inlet pump is started, a heater 1-5 is started, the liquid level of the vacuum tank is greater than or equal to 50%, a valve V3 is opened, an outlet oil pump is started, the temperature reaches a set value (60 degrees), a valve V3 is closed, a valve V2 is opened, circulating oil filtering is started, the set effective oil filtering time is reached, an outlet valve of the transformer is closed, and the oil filtering machine is stopped.
The above-mentioned embodiments only express the embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (7)
1. An automatic control method for the treatment of the insulating oil of an extra-high voltage converter station is characterized by comprising the following steps:
s1, judging whether each power supply and valve electrical equipment is normal; if not, directly alarming and exiting the program; if the oil is normal, the oil is filtered in a full-sealed mode;
s2, after the full-sealed oil filtering is finished, judging whether the data parameters of the pressure resistance value, the micro water content, the gas content, the dielectric loss and the granularity of the oil body are normal, and if not, continuing the full-sealed oil filtering program; if the oil is normal, performing a vacuum oil inlet flow;
s3, when the preset oil inlet total amount or liquid level height data is reached to the expected value, the vacuum oil inlet process is ended;
s4, after the vacuum oil inlet is finished, performing a transformer circulating oil filtering program, and setting circulating oil filtering time and temperature; if yes, detecting a transformer circulating oil filtering program, and setting the circulating oil filtering time and temperature; if yes, detecting whether relevant parameters of the transformer circulating oil filter are qualified; if the program is qualified, the program is exited; if the oil is not qualified, the full-sealed oil filtering is restarted.
2. The automatic control method for the insulation oil treatment of the extra-high voltage converter station according to claim 1, characterized in that: through the state quantity and the switching value input by the sensor element controller, the controller judges whether a power supply is normal, whether the valve switching position is normal, whether the vacuum oil level is normal, whether the steam-water separator has oil and whether a fault signal exists in the oil filter.
3. The automatic control method for the treatment of the insulating oil of the extra-high voltage converter station according to claim 2, characterized in that: after all normal conditions, automatically starting an oil filtering program; if the fault exists, the machine is temporarily stopped and an alarm is given to a worker, and the worker removes the fault and then transmits power to continue the next process;
after the oil filtering process is started, the on-off quantity of the valve feeds back the state of the outlet delay switch or the state of the outlet delay switch which is not switched on, and feeds back alarm information to a worker, and whether the oil filtering process is suspended or not is selected according to programming.
4. The automatic control method for the treatment of the insulating oil of the extra-high voltage converter station according to claim 3, characterized in that: after the filtered insulating oil flows into the empty tank, the monitoring device monitors the liquid level of the insulating oil, switches the oil tank to close the valve when the liquid level of the insulating oil reaches the preset liquid level height, switches the oil tank to be repeatedly filled in all the tank bodies, and then the full-sealed oil filtering process is finished.
5. The automatic control method for the insulation oil treatment of the extra-high voltage converter station according to claim 4, characterized in that: after the confirmation system sends out a signal for completing vacuum oil filtering, a signal for monitoring the qualified oil sample by an oil tank bottom sensor and a signal for judging whether the state quantity of the oil filter has a fault, opening a corresponding valve according to the preset oil inlet quantity; starting an oil inlet flow of the No. N tank body, the oil filter and the transformer;
during the oil inlet process, all signals are monitored in real time, and when abnormality occurs, the system automatically pauses and gives an alarm to workers;
and after the preset oil inlet total amount is reached or the liquid level height data observed by a worker reaches a preset value, automatically or manually finishing the vacuum oil inlet flow.
6. The automatic control method for the insulation oil treatment of the extra-high voltage converter station according to claim 5, characterized in that: the oil filtering time and temperature of the transformers of different models are different, the parameters of the oil filtering time and temperature of the transformers of different models are preset in the system, and the models are directly selected in the system when the transformers are circularly filtered.
7. The automatic control method for the treatment of the insulating oil of the extra-high voltage converter station according to claim 6, characterized in that: after the system sends a vacuum oil filtering flow completion signal and an oil filter state quantity normal signal, the system opens a corresponding valve according to preset circulating oil filtering time and temperature setting to start a circulating oil filtering process;
after the set temperature value is reached, counting down according to set time is started, circulating oil filtering is carried out, after the counting down is finished, the outlet valve of the transformer is closed, oil inlet of the transformer is completed, the oil filter is stopped, and all valves are closed.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114733258A (en) * | 2022-04-12 | 2022-07-12 | 国家电网有限公司特高压建设分公司 | Insulating oil filtering system and filtering method |
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