CN110136929B - Oil self-circulation device of oil-immersed transformer and control method - Google Patents
Oil self-circulation device of oil-immersed transformer and control method Download PDFInfo
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- CN110136929B CN110136929B CN201910490577.8A CN201910490577A CN110136929B CN 110136929 B CN110136929 B CN 110136929B CN 201910490577 A CN201910490577 A CN 201910490577A CN 110136929 B CN110136929 B CN 110136929B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/10—Liquid cooling
- H01F27/12—Oil cooling
- H01F27/14—Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
- H01F2027/404—Protective devices specially adapted for fluid filled transformers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
- H01F2027/406—Temperature sensor or protection
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Abstract
An oil self-circulation device of an oil immersed transformer and a control method belong to the technical field of power supply and distribution, and comprise a breaker unit matched with the transformer, a transformer oil tank arranged on a transformer body, an oil storage tank connected with the transformer oil tank by a pressure relief oil path and a return oil path, and a control circuit, wherein the input end of the breaker unit is connected with the control circuit, and a one-way variable oil pump I, a speed regulating valve I, a cooler, a filter, a water diversion drainer and an internal pressure one-way valve which is connected with the one-way variable oil pump I and the speed regulating valve I in parallel are sequentially arranged on the pressure relief oil path; and a one-way variable oil pump II, a speed regulating valve II and an electromagnetic control one-way valve which is connected with the one-way variable oil pump II and the speed regulating valve II in parallel are sequentially arranged on the return oil way. Through the improvement of the oil self-circulation structure and the control strategy of the transformer, the problem that power supply cannot be recovered in time after the transformer breaks down in operation is solved, and the adverse effect of insulating oil on the environment after the transformer breaks down is eliminated.
Description
Technical Field
The invention relates to the technical field of power supply and distribution, in particular to an oil self-circulation device of an oil-immersed transformer and a control method.
Background
The oil-immersed transformer is a static electrical device, completes high-voltage transmission and low-voltage distribution processes by changing the magnitude of alternating voltage or current, and plays a role in transmitting and converting electric energy. The oil drainage and pressure relief of a pressure relief valve are generally used as safety measures of the conventional oil-immersed transformer, and when the internal pressure of an oil tank of the transformer is not more than a preset value, the oil tank of the transformer is in a closed state; when the transformer fails, the pressure in the transformer oil tank rises to be larger than a preset value, the pressure release valve is opened, and after the pressure in the transformer oil tank is released, the pressure release valve is closed. After the transformer implements the pressure relief mode, the phenomena of overflow of transformer insulating oil and difficulty in cleaning exist, and the pollution influence on the surrounding environment is further caused; after the transformer implements the pressure relief process, although outside air or moisture can be prevented from entering the inside of the transformer oil tank, due to the loss of the insulating oil, the transformer cannot be put into use in time after the restorable fault of the transformer is eliminated, and the problem that power supply cannot be restored in time is caused.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an oil self-circulation device of an oil-immersed transformer and a control method, wherein the problem that power supply cannot be recovered in time after a fault occurs in the operation of the oil-immersed transformer is solved by improving an oil self-circulation structure and a control strategy of the transformer, and the adverse effect of insulating oil on the environment after the fault of the transformer is eliminated.
The technical scheme adopted by the invention is as follows: an oil self-circulation device of an oil immersed transformer comprises a transformer, a matched breaker unit, a transformer oil tank arranged on a transformer body, an oil storage tank connected with the transformer oil tank by means of a pressure relief oil path and a return oil path, and a control circuit with a monitoring and fault diagnosis program, wherein the input end of the breaker unit is connected with the control circuit, and a one-way variable oil pump I, a speed regulating valve I, a cooler, a filter, a water diversion drainer and an internal pressure one-way valve which is connected with the one-way variable oil pump I and the speed regulating valve I in parallel are sequentially arranged on the pressure relief oil path; and a one-way variable oil pump II, a speed regulating valve II and an electromagnetic control one-way valve which is connected with the one-way variable oil pump II and the speed regulating valve II in parallel are sequentially arranged on the return oil way.
The control circuit comprises a CPU module with monitoring and fault diagnosis programs, an acquisition module, an information transceiving module, an information prompt module and hardware equipment matched with the modules, wherein the acquisition module, the information transceiving module and the information prompt module are connected to a data bus of the CPU module.
Furthermore, an oil level detector, a pressure detector, an oil temperature detector and an environmental temperature detector are arranged on the transformer oil tank and the oil storage tank; and the output ends of the oil level detector, the pressure detector, the oil temperature detector and the environment temperature detector are connected to the input end of the acquisition module.
Further, an adjustable continuous air release valve is further arranged on the oil storage tank.
The control method of the self-pressure-relief device of the transformer comprises the following steps:
the method comprises the following steps that firstly, after a transformer is electrified, a monitoring and fault diagnosis program is started, and a collection module receives real-time detection parameters of an oil level detector, a pressure detector, an oil temperature detector and an environment temperature detector which are distributed by a transformer oil tank;
step two, the CPU module judges the working state of the transformer according to the received real-time detection parameters;
2.1 when the internal detection parameters of the transformer oil tank meet the conditions that the oil pressure F1 is less than or equal to a preset oil pressure value F, the temperature rise value T1 is less than or equal to a preset temperature rise value T and the oil level L1 is greater than an oil level warning value L, determining that the transformer is in a normal state and maintaining the operation of the transformer;
2.2 when the internal detection parameters of the transformer oil tank meet the conditions that the preset oil pressure value F is less than or equal to the oil pressure F1 and less than or equal to 105% of the preset oil pressure value F or the preset temperature rise value T is less than or equal to the temperature rise value T1 and less than or equal to 105% of the preset temperature rise value T under the condition that the oil level L1 is greater than the oil level warning value L, determining that the transformer is in an overrun state, opening an internal pressure one-way valve and an electromagnetic control one-way valve, performing low-speed oil drainage and oil return on the transformer oil tank, and maintaining;
2.3 when the internal detection parameters of the transformer oil tank meet the conditions that the oil pressure F1 is greater than 105% of a preset oil pressure value F or the temperature rise value T1 is greater than 105% of a preset temperature rise value T or the oil level L1 is less than or equal to an oil level warning value L, when the transformer is judged to be in a fault state, the breaker unit cuts off a power supply at the upper port of the transformer, and simultaneously starts the one-way variable oil pump I and the speed regulating valve I to drain oil of the transformer oil tank at a high speed until the oil drainage is finished;
2.3.1 detecting parameters in the transformer oil tank, and when the condition that the temperature rise value T1 is less than or equal to 105% of the preset temperature rise value T is met, opening the electromagnetic control one-way valve, and performing low-speed oil return on the transformer oil tank through a return oil way;
① in low-speed oil return, if the liquid level rising rate value V1 in the transformer oil tank is not less than 98.5% of the preset liquid level rising rate value V, it is determined that the transformer oil tank has no leakage point, the electromagnetic control one-way valve is closed, and simultaneously the one-way variable oil pump II and the speed regulating valve II are opened, and high-speed oil return is carried out on the transformer oil tank through the return oil path;
A. when the oil level L1 in the transformer oil tank is detected to be larger than an oil level warning value L, the circuit breaker unit is switched on and the transformer recovers operation;
B. when the transformer recovers to operate, if the internal detection parameters of the transformer oil tank meet the conditions that the oil pressure F1 is larger than 105% of the preset oil pressure value F or the temperature rise value T1 is larger than 105% of the preset temperature rise value T or the oil level L1 is smaller than the oil level warning value L again, the breaker unit cuts off the power supply at the upper port of the transformer, simultaneously starts the one-way variable oil pump I and the speed regulating valve I, carries out high-speed oil drainage on the transformer oil tank until the oil drainage is completed, and the control circuit sends out an alarm signal and informs maintenance personnel;
② in low-speed oil return, if the liquid level rising rate value V1 in the transformer oil tank is less than 98.5% of the preset liquid level rising rate value V, it is determined that the transformer oil tank has leakage, the electromagnetic control one-way valve is closed, and simultaneously, high-speed oil drainage is carried out on the transformer oil tank until oil drainage is completed, the control circuit sends out alarm signal and informs maintenance personnel.
Furthermore, in the process of high-speed oil drainage of the transformer oil tank, when the oil pressure value in the oil storage tank exceeds the bearing limit of the oil storage tank, the adjustable continuous air release valve is opened to assist in pressure relief.
Further, the formula for calculating the temperature rise value is T1= TY-THWherein T1 represents the temperature rise value, TYRepresenting the temperature, T, of the transformer oilHRepresenting the ambient temperature at which the device operates.
Further, the formula for calculating the liquid level rising rate value is V1= B/S, wherein V1 represents the liquid level rising rate value, B represents the oil return speed of the return oil path, and S represents the effective transverse cross-sectional area of the transformer oil tank.
The beneficial effects produced by adopting the invention are as follows: by improving the oil self-circulation structure and the control strategy of the transformer, the problem that power supply cannot be recovered in time after a fault occurs in the operation of the oil-immersed transformer is solved, and the adverse effect of insulating oil on the environment after the fault of the transformer is eliminated.
Drawings
FIG. 1 is a schematic diagram of the structural principle of the present invention;
FIG. 2 is a logic block diagram of the control method of the present invention;
in the drawings: 105A is a transformer oil tank, 105B is an oil storage tank, 113 is a pressure relief oil circuit, 103a is a one-way variable oil pump I, 102a is a speed regulation valve I, 111 is a cooler, 110 is a filter, 104 is a water diversion drainer, 112 is an internal pressure one-way valve, 312 is a return oil circuit, 103B is a one-way variable oil pump II, 102B is a speed regulation valve II, 101 is an electromagnetic control one-way valve, 107 is an oil level detector, 108 is a pressure detector, 106 is an oil temperature detector, and 109 is an adjustable continuous deflation valve.
Detailed Description
Referring to fig. 1, an oil self-circulation device of an oil-filled transformer comprises a transformer and a matched breaker unit, a transformer oil tank 105A arranged on a transformer body, an oil storage tank 105B connected with the transformer oil tank 105A by a pressure relief oil path 113 and a return oil path 312, and a control circuit with monitoring and fault diagnosis programs, wherein the input end of the breaker unit 304 is connected with the control circuit, and a one-way variable oil pump i 103a, a speed regulating valve i 102a, a cooler 111, a filter 110, a water diversion drainer 104 and an internal pressure one-way valve 112 which is connected with the one-way variable oil pump i 103a and the speed regulating valve i 102a in parallel are sequentially arranged on the pressure relief oil path 113; the return oil path 312 is provided with a one-way variable oil pump ii 103b, a governor valve ii 102b, and an electromagnetically controlled one-way valve 101 connected in parallel with the one-way variable oil pump ii 103b and the governor valve ii 102 b. The control circuit comprises a CPU module with monitoring and fault diagnosis programs, an acquisition module, an information transceiving module, an information prompt module and hardware equipment matched with the modules, wherein the acquisition module, the information transceiving module and the information prompt module are connected to a data bus of the CPU module.
In the specific embodiment, in fig. 1, the transformer tank 105A and the oil storage tank 105B are connected by a pressure relief oil path 113, and the pressure relief oil path 113 is provided with: the device comprises a one-way variable oil pump I103 a, a speed regulating valve I102 a, a cooler 111 with coolant, a filter 110 with an indicator, a water diversion and drainage device 104 with an automatic drainage function and an internal pressure one-way valve 112 which is connected with a local oil path formed by the oil pump 103a and the speed regulating valve 102a in parallel. The oil tank 105A is connected to the oil reservoir 105B through a return oil passage 312, and the return oil passage 312 is provided with: a one-way variable oil pump II 103b, a speed regulating valve II 102b and an electromagnetic control one-way valve 101 connected with the oil path in parallel. The unidirectional variable oil pump I103 a and the unidirectional variable oil pump II 103b are adjustable electromagnetic operators with position detection and feedback functions; the internal pressure check valve 112 and the solenoid-operated check valve 101 have a position detection feedback function.
In actual operation, in order to reduce the influence of the insulating oil on the oil level of the transformer tank 105A during operation in the pressure relief oil path 113 and the return oil path 312, the transformer tank 105A is filled with oil to 110% -115% of the warning value of the oil level, and the oil is pre-filled in the oil tank 105B, the pressure relief oil path 113 and the return oil path 312 in a proper amount.
An oil level detector 107, a pressure detector 108, an oil temperature detector 106 and an environmental temperature detector are arranged on the transformer oil tank 105A and the oil storage tank 105B; and the output ends of the oil level detector 107, the pressure detector 108, the oil temperature detector 106 and the ambient temperature detector are connected to the input end of the acquisition module. An adjustable continuous air release valve 109 is also arranged on the oil storage tank 105B.
Referring to fig. 2, the method for controlling the self-pressure-relief device of the transformer includes the following steps:
step one, after a transformer is electrified, starting a monitoring and fault diagnosis program, and receiving real-time detection parameters of an oil level detector 107, a pressure detector 108, an oil temperature detector 106 and an environment temperature detector which are distributed by a transformer oil tank 105A by an acquisition module;
step two, the CPU module judges the working state of the transformer according to the received real-time detection parameters;
2.1 when the internal detection parameters of the transformer oil tank 105A meet the conditions that the oil pressure F1 is less than or equal to a preset oil pressure value F, the temperature rise value T1 is less than or equal to a preset temperature rise value T and the oil level L1 is greater than an oil level warning value L, determining that the transformer is in a normal state and maintaining the operation of the transformer;
2.2 when the internal detection parameters of the transformer oil tank 105A meet the conditions that the preset oil pressure value F is less than or equal to the oil pressure F1 and less than or equal to 105% of the preset oil pressure value F or the preset temperature rise value T is less than or equal to the temperature rise value T1 and less than or equal to 105% of the preset temperature rise value T under the condition that the oil level L1 is greater than the oil level warning value L, determining that the transformer is in an overrun state, starting the internal pressure one-way valve 112 and the electromagnetic control one-way valve 101, performing low-speed oil drainage and oil return on the transformer oil tank 105A, and maintaining the;
in the low-speed oil drainage process, the cooler 111 with the coolant in the pressure relief oil path 113 effectively reduces the oil temperature.
2.3 when the internal detection parameters of the transformer oil tank 105A meet the conditions that the oil pressure F1 is greater than 105% of the preset oil pressure value F or the temperature rise value T1 is greater than 105% of the preset temperature rise value T or the oil level L1 is less than or equal to the oil level warning value L, when the transformer is judged to be in a fault state, the breaker unit cuts off the upper port power supply of the transformer, and simultaneously starts the one-way variable oil pump I103 a and the speed regulating valve I102 a to drain the transformer oil tank 105A at a high speed until the drainage is completed;
2.3.1 detecting parameters in the transformer oil tank 105A, and when the condition that the temperature rise value T1 is less than or equal to 105% of the preset temperature rise value T is met, opening the electromagnetic control one-way valve 101, and performing low-speed oil return on the transformer oil tank 105A through the return oil way 312;
① in low-speed oil return, if the liquid level rising rate value V1 inside the transformer oil tank 105A is not less than 98.5% of the preset liquid level rising rate value V, it is determined that the transformer oil tank 105A has no leakage point, the electromagnetic control one-way valve 101 is closed, the one-way variable oil pump II 103b and the speed regulating valve II 102b are opened, and high-speed oil return is carried out on the transformer oil tank 105A through the return oil path 312;
the further improvement measures are as follows: in the high-speed oil return process, whether the liquid level rising rate value V1 is not less than a theoretical preset liquid level rising rate value in the high-speed oil return process is judged; if the leakage point is smaller than the preset value, judging that the transformer oil tank 105A has a leakage point, immediately stopping high-speed oil return, and executing a high-speed oil drainage process of the transformer oil tank 105A;
A. when the oil level L1 in the transformer oil tank 105A is detected to be larger than the oil level warning value L, the circuit breaker unit is switched on and the transformer recovers to operate;
B. when the transformer recovers to operate, if the internal detection parameters of the transformer oil tank 105A meet the requirement that the oil pressure F1 is larger than 105% of the preset oil pressure value F or the temperature rise value T1 is larger than 105% of the preset temperature rise value T or the oil level L1 is smaller than the oil level warning value L again, the breaker unit cuts off the power supply of the upper port of the transformer, simultaneously starts the one-way variable oil pump I103 a and the speed regulating valve I102 a, carries out high-speed oil drainage on the transformer oil tank 105A until the oil drainage is finished, and the control circuit sends out an alarm signal and informs maintenance personnel;
② in low-speed oil return, if the liquid level rising rate value V1 inside the transformer oil tank 105A is less than 98.5% of the preset liquid level rising rate value V, it is determined that there is leakage in the transformer oil tank 105A, the electromagnetic control one-way valve 101 is closed, and simultaneously, high-speed oil drainage is performed on the transformer oil tank 105A until the oil drainage is completed, and the control circuit sends out an alarm signal and notifies maintenance personnel.
The preset oil pressure value F, the preset temperature rise value T, the oil level warning value L and the preset liquid level rising speed value V can be determined according to actual products and actual requirements; wherein the preset temperature rise value T is set to 60K according to the regulations of the relevant national standards.
The temperature rise value is calculated by the formula of T1= TY-THWherein T1 represents the temperature rise value, TYRepresenting the temperature, T, of the transformer oilHRepresenting the ambient temperature at which the device operates.
In the operation of the transformer, all the insulating oil discharged in the oil drainage process reaches the oil storage tank 105B after passing through the cooler 111, the filter 110 and the water diversion drainer 104, so that the quality of the insulating oil in the oil storage tank 105B is better, and the recyclability of the insulating oil is ensured to a great extent.
In the process of carrying out high-speed oil drainage on the transformer oil tank 105A, when the oil pressure value in the oil storage tank 105B exceeds the bearing limit of the oil storage tank 105B, the adjustable continuous air release device 109 is started to assist in pressure release; the process can ensure that the collection of the insulating oil is completed when the transformer has major faults, and the adverse influence on the environment is greatly reduced while other parts are not damaged. The formula for calculating the liquid level rising rate value is V1= B/S, wherein V1 represents the liquid level rising rate value, B represents the oil return speed of the return oil way, and S represents the effective transverse sectional area of the transformer oil tank. In the embodiment, the preset liquid level rising rate value V is changed according to the oil return speed in the real-time return oil way.
The control method of the present invention is described in detail with reference to the above oil path structure and embodiments:
when a fault occurs in the running process of the transformer, various instruments and meters arranged on the transformer oil tank body 105A monitor various data and actual running conditions of the transformer oil tank body in real time and feed back the data and the actual running conditions to the control circuit, and the control circuit determines whether the transformer can maintain a normal running state or not according to judgment conditions; and the self-diagnosis and self-recovery operation process of the internal fault of the transformer is completed by controlling related devices in the pressure relief oil path 113 and the return oil path 312.
Firstly, the working step that the oil pressure in the transformer oil tank 105A is abnormal:
the control circuit monitors and transmits data of the oil pressure F1 in the transformer oil tank 105A in real time in the normal operation process of the transformer, once the oil pressure F1 exceeds a preset oil pressure value F, the control circuit rapidly makes data comparison to judge whether the oil pressure F1 generated due to faults exceeds 105% of the preset oil pressure value F, if not, the internal pressure one-way valve 112 of the pressure relief oil circuit 113 is opened to discharge oil into the oil tank 105B, and low-speed oil drainage and pressure relief are realized; meanwhile, the oil level change condition is monitored in real time, if the oil level L1 is kept above the oil level warning value L and the oil pressure F1 does not exceed 105% of the preset oil pressure value F all the time, an appropriate amount of oil is returned from the oil storage tank 105B to the transformer oil tank 105A by controlling the electromagnetic control one-way valve 101 in the return oil path 312, in the process, pressure data and oil level data are monitored in real time, internal pressure abnormal maintenance information is sent to a background through a control circuit, the system is maintained to be operated, and self-diagnosis and self-recovery processes of internal faults of the transformer are completed.
If the oil pressure F1 is detected to exceed 105% of the preset oil pressure value F or the oil level L1 reaches the oil level warning value L in the operation process, the control circuit immediately starts a protection program, a power supply on the power supply side of the transformer is cut off by controlling the breaker unit, and meanwhile, the one-way variable oil pump I103 a and the speed regulating valve I102 a of the pressure relief oil path 113 operate, so that the transformer quickly completes the high-speed oil drainage and pressure relief process. After oil drainage is finished, the control circuit judges whether a temperature rise value T1 inside the transformer oil tank 105A is lower than 105% of a preset temperature rise value T or not through data comparison, if the temperature rise value T is higher than 105% of the preset temperature rise value T, field and background alarming is carried out through an alarming device and a communication module, and personnel are required to carry out field maintenance, equipment resetting and power restoration; if the temperature rise value T1 in the transformer oil tank 105A is lower than 105% of the preset temperature rise value T, low-speed oil return is carried out from the oil storage tank 105B to the transformer oil tank 105A through the electromagnetic control one-way valve 101, the oil level condition is monitored in real time to judge whether the oil tank body leaks, if the oil tank body does not leak, the one-way variable oil pump II 103B and the speed regulating valve II 102B in the return oil path 312 run to carry out a high-speed return oil supply process, the oil level condition is monitored in real time in the process to judge whether the oil tank body leaks, and if the oil level reaches the oil level warning value L that the transformer can normally run in the process, the control circuit controls the upper-port circuit breaker unit to be switched on to realize the recovery operation of the transformer.
In the process of recovering the operation of the transformer, the oil pressure F1 in the oil tank 105A of the transformer exceeds 105% of the preset oil pressure value F again, the control circuit immediately starts a protection program, controls the circuit breaker unit to cut off the power supply of the upper port of the transformer, carries out field and background alarm through the alarm device and the communication module, and requires personnel to carry out field maintenance, equipment reset and power supply recovery.
Secondly, the working step that the temperature inside the transformer oil tank 105A is abnormal:
the control circuit monitors the oil temperature in the transformer oil tank 105A in real time and transmits data in the normal operation process of the transformer, the temperature rise value T1 of the oil is calculated by combining the environmental temperature, once the temperature rise value T1 exceeds the preset temperature rise value T, the control circuit rapidly makes data comparison to judge whether the temperature rise value T1 generated due to fault exceeds 105% of the preset temperature rise value T, if not, the internal pressure one-way valve 112 of the pressure relief oil path 113 is opened to discharge oil to the oil storage tank 105B, and low-speed oil drainage pressure relief is realized; meanwhile, the oil level change condition is monitored in real time, if the oil level L1 is kept above the oil level warning value L and the temperature rise value T1 does not exceed 105% of the preset temperature rise value T all the time, an appropriate amount of oil is returned from the oil storage tank 105B to the transformer oil tank 105A by controlling the electromagnetic control one-way valve 101 in the return oil path 312, in the process, pressure data and oil level data are monitored in real time, temperature abnormal maintenance information is sent to a background through a control circuit, the system is maintained to operate, and the self-diagnosis and self-recovery process of the internal fault of the transformer is completed.
If the temperature rise value T1 exceeds 105% of the preset temperature rise value T or the oil level L1 reaches the oil level warning value L in the logic process, the control circuit immediately starts a protection program, a power supply on the power supply side of the transformer is cut off by controlling the circuit breaker unit, and meanwhile, the one-way variable oil pump I103 a and the speed regulating valve I102 a of the pressure relief oil path 113 operate, so that the transformer quickly completes the high-speed oil drainage and pressure relief process. After oil drainage is finished, the control circuit judges whether a temperature rise value T1 in the transformer oil tank 105A is lower than 105% of a preset temperature rise value T or not through data comparison, if the temperature rise value T is higher than 105% of the preset temperature rise value T, field and background alarming is carried out through an alarming device and a communication module, and personnel are required to carry out field maintenance, equipment resetting and power restoration; if the temperature rise value T1 in the transformer oil tank 105A is lower than 105% of the preset temperature rise value T, low-speed oil return is carried out from the oil storage tank 105B to the transformer oil tank 105A through the electromagnetic control one-way valve 101, the oil level condition is monitored in real time to judge whether the oil tank body leaks, if the oil tank body does not leak, the one-way variable oil pump II 103B and the speed regulating valve II 102B in the return oil path 312 run to carry out a high-speed return oil supply process, the oil level condition is monitored in real time in the process to judge whether the oil tank body leaks, and if the oil level reaches the oil level warning value L that the transformer can normally run in the process, the control circuit controls the upper-port circuit breaker unit to be switched on to realize the recovery operation of the transformer.
In the process of the recovery operation of the transformer, the oil temperature rise value T1 in the transformer oil tank 105A exceeds 105% of the preset temperature rise value T again, the control circuit immediately starts a protection program, controls the circuit breaker unit to cut off the power supply of the upper port of the transformer, carries out on-site and background alarm through the alarm device and the communication module, and requires personnel to carry out on-site maintenance, equipment reset and power supply recovery.
Claims (7)
1. The utility model provides an oil self-loopa device of oil-immersed transformer, includes the circuit breaker unit that matches with the transformer, sets up transformer tank (105A) on transformer body, with the help of pressure release oil circuit (113) and return oil circuit (312) and oil storage tank (105B) and the control circuit who is connected with transformer tank (105A), the input and the control circuit of circuit breaker unit are connected, its characterized in that: a one-way variable oil pump I (103 a), a speed regulating valve I (102 a), a cooler (111), a filter (110), a water diversion drainer (104) and an internal pressure one-way valve (112) which is connected with the one-way variable oil pump I (103 a) and the speed regulating valve I (102 a) in parallel are sequentially arranged on the pressure relief oil path (113); a one-way variable oil pump II (103 b), a speed regulating valve II (102 b) and an electromagnetic control one-way valve (101) which is connected with the one-way variable oil pump II (103 b) and the speed regulating valve II (102 b) in parallel are sequentially arranged on the return oil path (312); an adjustable continuous air release valve (109) is further arranged on the oil storage tank (105B).
2. Oil self-circulation device for oil filled transformers according to claim 1, characterized in that: the control circuit comprises a CPU module with monitoring and fault diagnosis programs, an acquisition module, an information transceiving module, an information prompt module and hardware equipment matched with the modules, wherein the acquisition module, the information transceiving module and the information prompt module are connected to a data bus of the CPU module.
3. Oil self-circulation device for oil filled transformers according to claim 2, characterized in that: an oil level detector (107), a pressure detector (108), an oil temperature detector (106) and an ambient temperature detector are arranged on the transformer oil tank (105A) and the oil storage tank (105B); and the output ends of the oil level detector (107), the pressure detector (108), the oil temperature detector (106) and the environment temperature detector are connected to the input end of the acquisition module.
4. A control method of an oil self-circulation device of an oil-filled transformer according to claims 1-3, characterized in that the method comprises the following steps:
step one, after a transformer is electrified, starting a monitoring and fault diagnosis program, and receiving real-time detection parameters of an oil level detector (107), a pressure detector (108), an oil temperature detector (106) and an environment temperature detector which are distributed in a transformer oil tank (105A) by an acquisition module;
step two, the CPU module judges the real-time working state of the transformer according to the received real-time detection parameters;
2.1 when the internal detection parameters of the transformer oil tank (105A) meet the conditions that the oil pressure F1 is less than or equal to a preset oil pressure value F, the temperature rise value T1 is less than or equal to a preset temperature rise value T and the oil level L1 is greater than an oil level warning value L, determining that the transformer is in a normal state and maintaining the operation of the transformer;
2.2 when the internal detection parameters of the transformer oil tank (105A) meet the conditions that the preset oil pressure value F is less than or equal to the oil pressure F1 and less than or equal to 105% of the preset oil pressure value F or the preset temperature rise value T is less than or equal to the temperature rise value T1 and less than or equal to 105% of the preset temperature rise value T under the condition that the oil level L1 is greater than the oil level warning value L, determining that the transformer is in an overrun state, opening the internal pressure one-way valve (112) and the electromagnetic control one-way valve (101), performing low-speed oil drainage and oil return on the transformer oil tank (105A), and maintaining the operation of;
2.3 when the internal detection parameters of the transformer oil tank (105A) meet the conditions that the oil pressure F1 is larger than 105% of the preset oil pressure value F or the temperature rise value T1 is larger than 105% of the preset temperature rise value T or the oil level L1 is smaller than or equal to the oil level warning value L, when the transformer is judged to be in a fault state, the breaker unit cuts off the upper port power supply of the transformer, simultaneously starts the one-way variable oil pump I (103 a) and the speed regulating valve I (102 a), and carries out high-speed oil drainage on the transformer oil tank (105A) until oil drainage is finished;
2.3.1 detecting parameters in the transformer oil tank (105A), and when the condition that the temperature rise value T1 is less than or equal to 105% of the preset temperature rise value T is met, opening the electromagnetic control one-way valve (101), and performing low-speed oil return on the transformer oil tank (105A) through a return oil way (312);
① in the low-speed oil return process, if the liquid level rising rate value V1 in the transformer oil tank (105A) is not less than 98.5% of the preset liquid level rising rate value V, the transformer oil tank (105A) is judged to have no leakage point, the electromagnetic control one-way valve (101) is closed, the one-way variable oil pump II (103 b) and the speed regulating valve II (102 b) are opened, and the high-speed oil return is carried out on the transformer oil tank (105A) through the return oil way (312);
A. when the oil level L1 in the transformer oil tank (105A) is detected to be larger than an oil level warning value L, the circuit breaker unit is switched on and the transformer recovers to run;
B. when the transformer recovers to operate, if the internal detection parameters of the transformer oil tank (105A) meet the requirement that the oil pressure F1 is larger than 105% of the preset oil pressure value F or the temperature rise value T1 is larger than 105% of the preset temperature rise value T or the oil level L1 is smaller than the oil level warning value L again, the breaker unit cuts off the power supply of the upper port of the transformer, simultaneously starts the one-way variable oil pump I (103 a) and the speed regulating valve I (102 a), carries out high-speed oil drainage on the transformer oil tank (105A) until the oil drainage is finished, and the control circuit sends out an alarm signal and informs maintenance personnel;
② in the low-speed oil return process, if the liquid level rising rate value V1 in the transformer oil tank (105A) is less than 98.5% of the preset liquid level rising rate value V, the leakage phenomenon of the transformer oil tank (105A) is judged, the electromagnetic control one-way valve (101) is closed, meanwhile, the high-speed oil drainage is carried out on the transformer oil tank (105A) until the oil drainage is completed, and the control circuit sends out an alarm signal and informs maintenance personnel.
5. The method for controlling the oil self-circulation device of the oil-filled transformer according to claim 4, wherein: in the process of carrying out high-speed oil drainage on the transformer oil tank (105A), when the oil pressure value in the oil storage tank (105B) exceeds the bearing limit of the oil storage tank (105B), the adjustable continuous air release valve (109) is opened to assist in pressure relief.
6. The method for controlling the oil self-circulation device of the oil-filled transformer according to claim 4, wherein: the temperature rise value is calculated by the formula of T1= TY-THWherein T1 represents the temperature rise value, TYRepresenting the oil temperature of the transformer, THRepresenting the ambient temperature at which the device operates.
7. The method for controlling the oil self-circulation device of the oil-filled transformer according to claim 4, wherein: the formula for calculating the liquid level rising rate value is V1= B/S, wherein V1 represents the liquid level rising rate value, B represents the oil return speed of the return oil way, and S represents the effective transverse sectional area of the transformer oil tank.
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