CN111446069A - Protection method, system, device and equipment for oil-immersed transformer - Google Patents
Protection method, system, device and equipment for oil-immersed transformer Download PDFInfo
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- CN111446069A CN111446069A CN202010212718.2A CN202010212718A CN111446069A CN 111446069 A CN111446069 A CN 111446069A CN 202010212718 A CN202010212718 A CN 202010212718A CN 111446069 A CN111446069 A CN 111446069A
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- 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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Abstract
The invention discloses a method, a system, a device and equipment for protecting an oil-immersed transformer, wherein the sequence of obtaining a fault signal of the transformer and a fault signal of a bushing is judged; if the fault signal of the bushing is acquired before the fault signal of the transformer or the fault signal of the bushing and the fault signal of the transformer are acquired simultaneously, judging the bushing fault level; if the fault signal of the transformer is acquired before the fault signal of the bushing, judging whether the fault signal of the bushing is acquired within a preset time after the fault signal of the transformer is acquired; if the fault signal of the casing is obtained, judging the casing fault grade; and if the fault signal of the bushing is not acquired, judging the transformer fault level.
Description
Technical Field
The invention relates to the technical field of transformer protection, in particular to a method, a system, a device and equipment for protecting an oil-immersed transformer.
Background
The transformer bushing is a wire outlet device for leading a high-voltage wire inside a transformer to the outside of an oil tank, not only serves as insulation between a lead wire and the ground, but also plays a role of fixing the lead wire, and is a current-carrying element of the transformer, and a load current passes through the transformer for a long time in the operation process of the transformer. As the sleeve works under the working conditions of high field intensity and large current for a long time, the case of accidents caused by faults is rare, and statistical data shows that the accident accounts for about 20-30% of the transformer accidents.
During operation, the faults of the sleeve are mainly concentrated in the inner part of the sleeve, the lower porcelain bushing is positioned in the transformer lifting seat, particularly, the ground breakdown flashover caused by the defects of damage of the lower porcelain bushing fault porcelain bushing, poor top sealing and the like is difficult to monitor in a regular preventive test, and the device has the paroxysmal characteristic. And the time from the beginning of the fault to the formation of the earth discharge path is short, once the earth discharge generates electric arcs, the serious consequences such as cracking of the lower porcelain sleeve, damage of the oil tank, ignition of the main transformer and the like are often caused. In most cases of differential protection, heavy gas protection, pressure protection and the like configured in the existing oil-immersed transformer, a main transformer can be found and tripped after discharge caused by a sleeve fault, and only the damaged enlargement of the main transformer can be prevented, so that the timeliness is insufficient; the light gas protection of the transformer is only connected with an alarm signal, so that the light gas protection of the transformer is really effective for the condition that the main transformer does not need to be tripped due to poor sealing of the transformer, exceeding of the gas content and the like, but the condition of the fault of the bushing cannot be judged in time and effectively protected at the initial stage of the fault, and the fundamental reason is that the working mode of the existing gas relay cannot judge the position of the fault and cannot distinguish and protect the fault of the porcelain bushing under the bushing in the lifting seat.
Therefore, the method has important significance for protecting the transformer by separately processing the transformer fault and the bushing fault.
In summary, in the prior art, when an oil-immersed transformer fails, the transformer failure and the bushing failure cannot be distinguished.
Disclosure of Invention
In order to solve the problems, the invention provides a protection method, a system and equipment for an oil-immersed transformer, which effectively solve the technical problem that the transformer fault and the bushing fault cannot be distinguished and processed when the oil-immersed transformer fails in the prior art. .
The embodiment of the invention provides a protection method of an oil-immersed transformer, and the judgment method comprises the following steps:
acquiring a fault signal of the transformer by monitoring the light gas change of a main oil pipe of the transformer;
acquiring a fault signal of the sleeve by monitoring the light gas change of the sleeve connecting pipe;
judging the sequence of acquiring the fault signal of the transformer and the fault signal of the bushing;
when the fault signal of the bushing is acquired before the fault signal of the transformer or the fault signal of the bushing and the fault signal of the transformer are acquired simultaneously, judging the bushing fault level and outputting a bushing fault level processing signal;
when the fault signal of the transformer is acquired before the fault signal of the bushing, judging whether the fault signal of the bushing is acquired within a preset time after the fault signal of the transformer is acquired;
when the fault signal of the casing is obtained, judging the casing fault grade, and outputting a casing fault grade processing signal;
and when the fault signal of the bushing is not acquired, judging the transformer fault level, and outputting a transformer fault level processing signal.
Preferably, the output bushing fault level processing signal is specifically an output transformer trip signal.
Preferably, the output transformer fault level processing signal is specifically an output transformer alarm signal.
Preferably, the light gas change in the main oil pipe of the transformer is monitored by a first monitoring device installed on the main oil pipe of the transformer.
Preferably, the light gas change in the connection pipe of the casing is monitored by a second monitoring device installed on the connection pipe between the casing and the main oil pipe.
Preferably, the first monitoring device and the second monitoring device both comprise gas relays, the fault signal of the transformer is a light gas signal of the transformer, and the fault signal of the connecting pipe is a light gas signal of the bushing.
Preferably, the plurality of sleeve connecting pipes are arranged on the sleeve connecting pipes in a one-to-one correspondence manner, and when any one of the second monitoring devices sends a signal, the fault signal of the sleeve is acquired.
The embodiment of the invention also provides another protection system of the oil-immersed transformer, and the identification system comprises the following modules:
fault signal module of transformer: the monitoring device is used for monitoring the light gas change of a main oil pipe of the transformer to obtain a fault signal of the transformer;
fault signaling module of casing: the device is used for acquiring a fault signal of the sleeve by monitoring the light gas change of the sleeve connecting pipe;
a first judgment module: the fault detection circuit is used for judging the sequence of acquiring the fault signal of the transformer and the fault signal of the bushing;
casing failure first module: the device is used for judging the fault level of the bushing when the fault signal of the bushing is acquired before the fault signal of the transformer or the fault signal of the bushing and the fault signal of the transformer are acquired simultaneously, and outputting a bushing fault level processing signal;
a second judging module: the transformer fault detection circuit is used for judging whether the fault signal of the bushing is acquired within a preset time after the fault signal of the transformer is acquired when the fault signal of the transformer is acquired before the fault signal of the bushing;
casing failure second module: the device is used for judging the casing fault grade when the fault signal of the casing is acquired, and outputting a casing fault grade processing signal;
a transformer fault level module; and the processing module is used for judging the transformer fault grade when the fault signal of the bushing is not acquired, and outputting a transformer fault grade processing signal.
The invention also provides another embodiment of a protection device of an oil-immersed transformer, which comprises a first gas relay arranged on a main oil pipe, a second gas relay arranged on a connecting pipe and a logic judgment module, wherein the first gas relay and the second gas relay are respectively and electrically connected with the logic judgment module,
the first gas relay is used for acquiring a fault signal of the transformer by monitoring the light gas change of a main oil pipe of the transformer and sending the fault signal of the transformer to the logic judgment module;
the second gas relay is used for acquiring a fault signal of the bushing transformer by monitoring the light gas change of the bushing connecting pipe and sending the fault signal of the bushing to the logic judgment module;
the logic judgment module is used for judging the transmission sequence of the fault signal of the transformer and the fault signal of the bushing, and when the fault signal of the transformer is transmitted before the fault signal of the bushing or the fault signal of the transformer and the fault signal of the bushing are transmitted simultaneously, the logic judgment module judges the bushing fault grade and controls the transformer to realize tripping;
when the fault signal of the transformer is transmitted before the fault signal of the bushing, judging whether the fault signal of the bushing is transmitted within a preset time after the fault signal of the transformer is transmitted;
when the fault signal of the sleeve is sent, the fault grade of the sleeve is judged, and the transformer is controlled to trip;
and when the fault signal of the bushing is not sent, judging the fault level of the transformer, and controlling the transformer to realize alarm.
The invention also provides protection equipment of the oil-immersed transformer in another embodiment, which comprises a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is used for executing the protection method of the oil-immersed transformer according to the instructions in the program codes.
According to the technical scheme, the embodiment of the invention has the following advantages:
the embodiment of the invention acquires the fault signal of the transformer and the fault signal of the sleeve, because the main oil pipe and the sleeve connecting pipe of the transformer are in the same oil circuit system, when the transformer or the sleeve breaks down, light gas in the main oil pipe of the transformer and the sleeve connecting pipe can change, and time difference exists between the change of the light gas in the main oil pipe of the transformer and the change of the sleeve connecting pipe, and time difference also exists between the acquired fault signal of the transformer and the fault signal of the sleeve, theoretically, the two time differences are the same, and the time difference is mainly because the monitoring of a monitoring device close to the fault position is faster than that of a monitoring device far away from the fault position. However, in practical situations, errors exist in the monitoring process, the sending process, the receiving process and the like of the monitoring device, and therefore partial casing faults can be output without being recognized.
The fault of the bushing can be accurately determined by judging the sequence of acquiring the fault signal of the transformer and the fault signal of the bushing, and whether the fault signal of the bushing is acquired within a preset time after the fault signal of the transformer is acquired is judged if the fault signal of the bushing is acquired; the preset time is increased to avoid that the fault signal of the bushing is acquired later than the fault signal of the transformer due to an error, so that the misjudgment is avoided, the bushing fault can be effectively and preferentially identified, and the technical problem that the transformer fault and the bushing fault cannot be distinguished and processed when the oil-immersed transformer fails in the prior art is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a flowchart of a method, a system, and an apparatus for protecting an oil-immersed transformer according to a first embodiment of the present invention.
Fig. 2 is a system structural diagram of a protection system of an oil-immersed transformer according to a second embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a protection system for an oil-immersed transformer according to a third embodiment of the present invention.
Fig. 4 is an apparatus frame diagram of a method, a system, and an apparatus for protecting an oil-immersed transformer according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a protection method, a system and equipment for an oil-immersed transformer, which are used for solving the technical problem that when the oil-immersed transformer fails, the transformer failure and the bushing failure cannot be effectively distinguished and processed in the prior art.
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the prior art, a common gas relay is used for monitoring and processing a sleeve and a transformer, the transformer is usually tripped directly in a processing mode, and the mode often causes frequent tripping of the transformer due to common transformer problems, such as alarm tripping caused by poor sealing or oxygen content cross-over of the transformer and the like, so that the working efficiency of the transformer is greatly reduced. When a real bushing fault occurs, the monitoring device can measure the bushing fault after the bushing fault is discharged or the monitoring device needs to wait for the gas relay on the transformer to measure the bushing fault, a certain time exists between the bushing fault and the measured fault, and the bushing fault may damage the transformer in the time. In order to prevent the casing failure from being detected in time, the problem of possible casing failure should be dealt with first. Therefore, the condition that the bushing fault possibly occurs is listed in the bushing fault grade, the processing is carried out according to the bushing fault grade, the condition of missing report is reduced, the problem that the bushing fault possibly exists is eliminated, and then the problem can be listed as the transformer fault problem, so that the method has important significance for further improving the protection of the transformer.
As shown in fig. 1, a method for protecting an oil-immersed transformer according to an embodiment of the present invention includes:
acquiring a fault signal of the transformer by monitoring the change in a main oil pipe of the transformer;
the light gas change in the main oil pipe of the transformer is monitored through a first monitoring device installed on the main oil pipe of the transformer. When the transformer is in a fault grade, light gas of the main oil pipe of the transformer acts on the first monitoring device, the first monitoring device judges that the transformer is likely to have a fault, the first monitoring device sends out a fault signal of the transformer, and the corresponding processing device acquires the fault signal of the transformer. The fault signal of the transformer is a signal sent when a fault possibly exists in the transformer.
Acquiring a fault signal of the transformer by monitoring the light gas change of a main oil pipe of the transformer;
wherein the light gas change of the casing connection pipe is monitored by a second monitoring device installed on the connection pipe between the casing and the main oil pipe. When the sleeve pipe breaks down, light gas in the sleeve pipe connecting pipe can change, the second monitoring device monitors the light gas change of the sleeve pipe connecting pipe, then the sleeve pipe is judged to possibly break down, the second monitoring device sends out a fault signal of the sleeve pipe, and the corresponding processing device obtains the fault signal of the sleeve pipe. Preferably, the plurality of sleeve connecting pipes are arranged on the sleeve connecting pipes in a one-to-one correspondence manner, and when any one of the second monitoring devices sends a signal, the fault signal of the sleeve is acquired. The fault signal for the casing is a signal that is sent when there is a possible fault in the casing.
The first monitoring device and the second monitoring device both comprise gas relays, the fault signal of the transformer is a light gas signal of the transformer, and the fault signal of the connecting pipe is a light gas signal of the sleeve. The first monitoring device and the second monitoring device are both devices for monitoring the change of light gas in the oil pipe and converting the change into a fault signal to be sent out, and besides the gas relay, the first monitoring device and the second monitoring device can also be devices for other pressure or flow rate monitoring devices and the like, which can identify the change of the light gas in the oil pipe, and send the fault signal.
Judging the sequence of acquiring the fault signal of the transformer and the fault signal of the bushing; normally, when a transformer fails, a monitoring device on a main oil pipe of the transformer can monitor the failure condition at the first time and send a failure signal. Because the transformer main oil pipe and the casing connecting pipe are connected on the same oil circuit system, when the transformer fails, light gas and air flow in the transformer main oil pipe change, except that the first testing device on the transformer main oil pipe can test the change in the main oil pipe at the first time, the second monitoring device on the casing connecting pipe also monitors the change in the connecting pipe at the corresponding second time, and a fault signal of the casing pipe is sent through the second monitoring device. The first time and the second time are often unequal, and the fault possibly occurring on the transformer can be judged through the sequence of the first time and the second time. The first time and the second time are in sequence because the monitoring device close to the fault position usually monitors the fault and sends out a fault signal first, the monitoring device far away from the fault position usually monitors the fault and sends out the fault signal, and the monitoring device close to the fault position sends out a signal first than the monitoring device far away from the fault position, so that a corresponding time difference exists when two fault signals are received at one end for receiving and acquiring the fault signals. When a sleeve fails, light gas in the sleeve connecting pipe changes, the second monitoring device arranged on the sleeve connecting pipe monitors the failure condition of the sleeve and sends a failure signal of the sleeve, and the first monitoring device on the main oil pipe can also monitor the failure and send the failure signal of the transformer when the light gas changes and flows into the main oil pipe. The second monitoring device sends a fault signal before the first monitoring device, and when the receiving end acquires the fault signal, the acquired fault signal of the second monitoring device is prior to the fault signal of the first monitoring device. Through the difference of the sequence of the fault signals of the first monitoring device and the second monitoring device, which monitoring device possibly sends the fault signal first can be effectively judged, and the fault which is sent first or the fault of the sleeve pipe possibly occurs in the transformer can be correspondingly identified according to the monitoring devices.
When the fault signal of the bushing is acquired before the fault signal of the transformer or the fault signal of the bushing and the fault signal of the transformer are acquired simultaneously, judging the bushing fault level and outputting a bushing fault level processing signal;
the fault signal of the bushing is acquired before the fault signal of the transformer, and the second monitoring device corresponding to the fault signal of the bushing can quickly identify that the current fault is generated on the bushing, so that the transformer can be immediately processed, and the transformer can be effectively protected.
The fault signal of the bushing and the fault signal of the transformer are acquired simultaneously, so that the fault level of the transformer may be the fault level of the transformer, or the bushing may have a fault, at this time, because the severity of an accident caused by the bushing fault is considered to be higher than the fault of the transformer, errors in the monitoring process, the sending process, the receiving process and the like of the monitoring device exist in an actual situation, a part of bushing faults may not be identified and output, the bushing fault may cause a serious accident, in order to effectively protect the transformer, the condition that the bushing has a fault needs to be processed first, so that the bushing fault level is determined, a bushing fault level processing signal is output, the transformer can be protected, and the problem that the transformer is damaged due to the bushing fault is solved.
The output sleeve fault level processing signal is specifically an output transformer trip signal. And the transformer executes tripping operation after receiving a transformer tripping signal. Because the bushing fault grade is a serious condition, when the bushing fault grade is judged, the transformer immediately trips and is powered off to protect the transformer, and accidents such as fire disasters and the like caused by the failure of the bushing are avoided.
When the fault signal of the transformer is acquired before the fault signal of the bushing, judging whether the fault signal of the bushing is acquired within a preset time after the fault signal of the transformer is acquired;
in practical situations, errors may occur in the acquisition time of the fault signal of the transformer and the acquisition time of the fault signal of the bushing, and therefore, since the bushing has a fault condition seriously, the condition that the bushing has a fault condition possibly and can be listed as a transformer fault needs to be eliminated. When a fault signal of the transformer is received, it can be determined that a fault must occur in the transformer, but whether the specifically occurring fault is in the bushing still remains doubtful, a condition that the fault signal of the bushing is missed due to an error may exist, a preset time is increased to ensure that the condition that the bushing fault is likely to occur can be included in a bushing fault level, and the bushing fault level is processed, that is, a transformer trip signal is output.
The preset time can be set according to factors such as an actual monitoring device, a signal sending mode of the monitoring device, a signal receiving device and the like, and can be tested and obtained before use. The preset time is less than a time difference between a fault signal of the transformer and a fault signal of the bushing. The time difference between the fault signal of the transformer and the fault signal of the bushing is the time difference between the fault signal of the transformer acquired first and the fault signal of the bushing acquired later when the transformer or the bushing has a fault under the condition that no error exists theoretically.
When the fault signal of the casing is obtained, judging the casing fault grade, and outputting a casing fault grade processing signal; the fault signal of the bushing is acquired within the preset time after the fault signal of the transformer is acquired, which may be that there is a bushing fault but there is an error in the transmitting, signal transmitting or signal receiving process, and in order to avoid the situation of false alarm, the situation is brought into the bushing fault level for processing, thereby effectively preventing the situation of false alarm caused by the error.
And when the fault signal of the bushing is not acquired, judging the transformer fault level, and outputting a transformer fault level processing signal. And in the preset time after the fault signal of the transformer is acquired, the fault signal of the bushing is not acquired, and all the situations with bushing faults are eliminated in the situation, namely the current situation can only be the situation that the transformer has faults, so that the transformer fault grade is determined and the processing is carried out according to the processing mode of the transformer fault grade.
The output transformer fault level processing signal is specifically an output transformer alarm signal. The transformer sends out and reports an emergency and asks for help or increased vigilance after receiving alarm signal, but still can continue the function, treats personnel and maintains the inspection, has improved the work efficiency of transformer greatly, has avoided in the use, because the erroneous judgement of various conditions leads to the transformer often to trip, the problem that the transformer work efficiency that causes reduces.
As shown in fig. 2, a second embodiment of the present invention provides a protection system for an oil-immersed transformer, where the identification system includes the following modules:
fault signal module of transformer: the monitoring device is used for monitoring the light gas change of a main oil pipe of the transformer to obtain a fault signal of the transformer;
fault signaling module of casing: the device is used for acquiring a fault signal of the sleeve by monitoring the light gas change of the sleeve connecting pipe;
a first judgment module: the fault detection circuit is used for judging the sequence of acquiring the fault signal of the transformer and the fault signal of the bushing;
casing failure first module: the device is used for judging the fault level of the bushing when the fault signal of the bushing is acquired before the fault signal of the transformer or the fault signal of the bushing and the fault signal of the transformer are acquired simultaneously, and outputting a bushing fault level processing signal;
a second judging module: the transformer fault detection circuit is used for judging whether the fault signal of the bushing is acquired within a preset time after the fault signal of the transformer is acquired when the fault signal of the transformer is acquired before the fault signal of the bushing;
casing failure second module: the device is used for judging the casing fault grade when the fault signal of the casing is acquired, and outputting a casing fault grade processing signal;
a transformer fault level module; and the processing module is used for judging the transformer fault grade when the fault signal of the bushing is not acquired, and outputting a transformer fault grade processing signal.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
As shown in fig. 3, a third embodiment of the present invention further provides a protection device for an oil-immersed transformer, which is characterized in that the protection device comprises a first gas relay 11 installed on a main oil pipe, a second gas relay 12 installed on a connecting pipe, and a logic determination module 13, the first gas relay 11 and the second gas relay 12 are respectively electrically connected to the logic determination module 13,
the first gas relay 11 is used for acquiring a fault signal of the transformer by monitoring light gas change of a main oil pipe of the transformer and sending the fault signal of the transformer to the logic judgment module 13;
the second gas relay 12 is configured to acquire a fault signal of the bushing transformer by monitoring a change in light gas of the bushing connection pipe and send the fault signal of the bushing to the logic determination module 13;
and the logic judgment module 13 is configured to judge a sequence of the transmitted fault signal of the transformer and the fault signal of the bushing, and when the fault signal of the transformer is transmitted before the fault signal of the bushing or the fault signal of the transformer and the fault signal of the bushing are transmitted simultaneously, judge that the bushing is in a fault level, and control the transformer to trip.
When the fault signal of the transformer is transmitted before the fault signal of the bushing, judging whether the fault signal of the bushing is transmitted within a preset time after the fault signal of the transformer is transmitted;
when the fault signal of the sleeve is sent, the fault grade of the sleeve is judged, and the transformer is controlled to trip;
and when the fault signal of the bushing is not sent, judging the fault level of the transformer, and controlling the transformer to realize alarm.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
As shown in fig. 4, a fourth embodiment of the present invention provides a protection device 30 for an oil-filled transformer, which includes a processor 300 and a memory 301;
the memory 301 is used for storing a program code 302 and transmitting the program code 302 to the processor;
the processor 300 is configured to execute the steps of a method for protecting an oil-filled transformer according to the instructions in the program code 302.
Illustratively, the computer program 302 may be partitioned into one or more modules/units that are stored in the memory 301 and executed by the processor 300 to accomplish the present application. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution process of the computer program 302 in the terminal device 30.
The terminal device 30 may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing devices. The terminal device may include, but is not limited to, a processor 300, a memory 301. Those skilled in the art will appreciate that fig. 3 is merely an example of a terminal device 30 and does not constitute a limitation of terminal device 30 and may include more or fewer components than shown, or some components may be combined, or different components, e.g., the terminal device may also include input-output devices, network access devices, buses, etc.
The Processor 300 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The storage 301 may be an internal storage unit of the terminal device 30, such as a hard disk or a memory of the terminal device 30. The memory 301 may also be an external storage device of the terminal device 30, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like, which are provided on the terminal device 30. Further, the memory 301 may also include both an internal storage unit and an external storage device of the terminal device 30. The memory 301 is used for storing the computer program and other programs and data required by the terminal device. The memory 301 may also be used to temporarily store data that has been output or is to be output.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A protection method of an oil-immersed transformer is characterized in that the judgment method comprises the following steps:
acquiring a fault signal of the transformer by monitoring the light gas change of a main oil pipe of the transformer;
acquiring a fault signal of the sleeve by monitoring the light gas change of the sleeve connecting pipe;
judging the sequence of acquiring the fault signal of the transformer and the fault signal of the bushing;
when the fault signal of the bushing is acquired before the fault signal of the transformer or the fault signal of the bushing and the fault signal of the transformer are acquired simultaneously, judging the bushing fault level and outputting a bushing fault level processing signal;
when the fault signal of the transformer is acquired before the fault signal of the bushing, judging whether the fault signal of the bushing is acquired within a preset time after the fault signal of the transformer is acquired;
when the fault signal of the casing is obtained, judging the casing fault grade, and outputting a casing fault grade processing signal;
and when the fault signal of the bushing is not acquired, judging the transformer fault level, and outputting a transformer fault level processing signal.
2. The method for protecting an oil-filled transformer according to claim 1,
the output sleeve fault level processing signal is specifically an output transformer trip signal.
3. A method for protecting an oil-filled transformer according to claim 2,
the output transformer fault level processing signal is specifically an output transformer alarm signal.
4. A protection method for an oil-filled transformer according to claim 3, characterized in that the change of light gas in the main oil pipe of the transformer is monitored by the first monitoring device installed on the main oil pipe of the transformer.
5. A method for protecting an oil-filled transformer according to claim 4, characterized in that the change of light gas in the connection pipe of the bushing is monitored by a second monitoring device installed on the connection pipe between the bushing and the main oil pipe.
6. The method according to claim 5, wherein the first monitoring device and the second monitoring device each comprise a gas relay, the fault signal of the transformer is a light gas signal of the transformer, and the fault signal of the connection pipe is a light gas signal of the bushing.
7. The method according to claim 6, wherein the bushing connection pipes are provided with a plurality of second monitoring devices, the plurality of second monitoring devices are correspondingly mounted on the bushing connection pipes one by one, and when any one of the second monitoring devices sends a signal, a fault signal of the bushing is obtained.
8. A protection system for an oil-immersed transformer, characterized in that the identification system comprises the following modules:
fault signal module of transformer: the monitoring device is used for monitoring the light gas change of a main oil pipe of the transformer to obtain a fault signal of the transformer;
fault signaling module of casing: the device is used for acquiring a fault signal of the sleeve by monitoring the light gas change of the sleeve connecting pipe;
a first judgment module: the fault detection circuit is used for judging the sequence of acquiring the fault signal of the transformer and the fault signal of the bushing;
casing failure first module: the device is used for judging the fault level of the bushing when the fault signal of the bushing is acquired before the fault signal of the transformer or the fault signal of the bushing and the fault signal of the transformer are acquired simultaneously, and outputting a bushing fault level processing signal;
a second judging module: the transformer fault detection circuit is used for judging whether the fault signal of the bushing is acquired within a preset time after the fault signal of the transformer is acquired when the fault signal of the transformer is acquired before the fault signal of the bushing;
casing failure second module: the device is used for judging the casing fault grade when the fault signal of the casing is acquired, and outputting a casing fault grade processing signal;
a transformer fault level module; and the processing module is used for judging the transformer fault grade when the fault signal of the bushing is not acquired, and outputting a transformer fault grade processing signal.
9. A protection device of an oil-immersed transformer is characterized by comprising a first gas relay arranged on a main oil pipe, a second gas relay arranged on a connecting pipe and a logic judgment module, wherein the first gas relay and the second gas relay are respectively and electrically connected with the logic judgment module,
the first gas relay is used for acquiring a fault signal of the transformer by monitoring the light gas change of a main oil pipe of the transformer and sending the fault signal of the transformer to the logic judgment module;
the second gas relay is used for acquiring a fault signal of the bushing transformer by monitoring the light gas change of the bushing connecting pipe and sending the fault signal of the bushing to the logic judgment module;
the logic judgment module is used for judging the transmission sequence of the fault signal of the transformer and the fault signal of the bushing, and when the fault signal of the transformer is transmitted before the fault signal of the bushing or the fault signal of the transformer and the fault signal of the bushing are transmitted simultaneously, the logic judgment module judges the bushing fault grade and controls the transformer to realize tripping;
when the fault signal of the transformer is transmitted before the fault signal of the bushing, judging whether the fault signal of the bushing is transmitted within a preset time after the fault signal of the transformer is transmitted;
when the fault signal of the sleeve is sent, the fault grade of the sleeve is judged, and the transformer is controlled to trip;
and when the fault signal of the bushing is not sent, judging the fault level of the transformer, and controlling the transformer to realize alarm.
10. The protection device of the oil-immersed transformer is characterized by comprising a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the protection method of the oil-filled transformer according to any one of claims 1-7 according to instructions in the program code.
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