CN111986901B - Method and system for testing fixed value of starting time of oil pump in transformer - Google Patents
Method and system for testing fixed value of starting time of oil pump in transformer Download PDFInfo
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- CN111986901B CN111986901B CN202010718119.8A CN202010718119A CN111986901B CN 111986901 B CN111986901 B CN 111986901B CN 202010718119 A CN202010718119 A CN 202010718119A CN 111986901 B CN111986901 B CN 111986901B
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- open contact
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/001—Functional circuits, e.g. logic, sequencing, interlocking circuits
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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
Abstract
The invention provides a method for testing the starting time constant value of an oil pump in a transformer, which is used for an oil pump starting control loop of two oil pumps connected in the transformer and comprises the steps of detecting the connection condition of all circuits on the oil pump starting control loop; when all the circuits on the oil pump starting control loop are detected to be normally connected, and when the normally open contacts of the first manual valve SK1, the second manual valve SK2 and the transformer oil temperature sensor PWI or the normally open contact of the load sensing relay KC are closed, the starting time of the first oil pump MB1 and the second oil pump MB2 is obtained; and judging the qualification of the time constant value of the second delay relay KT4 according to the starting time of the first oil pump MB1 and the second oil pump MB 2. By implementing the invention, the qualification detection is carried out on the starting time fixed value of the oil pump starting control loop before the plurality of oil pumps are put into use, so that the phenomenon of relay protection tripping misoperation caused by the simultaneous starting of the plurality of oil pumps is avoided.
Description
Technical Field
The invention relates to the technical field of transformer testing, in particular to a method and a system for testing a fixed value of the starting time of an oil pump in a transformer.
Background
In the power system, the gas relay is also called heavy gas relay, is a protection element of the transformer, and is used for screening hot oil flow and hot gas which generate a certain driving force when the inside of the transformer fails. Therefore, the transformer is provided with differential protection for preventing the transformer from faults of various elements such as transformer bushings, outgoing lines, current transformers, coils, iron cores and the like, and is also provided with heavy gas protection as main protection. The working principle of heavy gas protection is that if the inside of an oil filled transformer has a discharge fault, an electric arc is discharged to decompose multiple characteristic gases such as methane, acetylene, hydrogen, carbon monoxide, carbon dioxide, ethylene, ethane and the like from transformer oil, and in the process that the characteristic gases rise into an oil pipe to an upper oil tank and are flushed to a conservator, an inner baffle at one end of a heavy gas relay is pushed to act, so that a normally open contact at the other end of the heavy gas relay is closed, relay protection tripping is started, and the purpose of cutting off the fault of the transformer is achieved, as shown in fig. 1.
For large-capacity transformers, the oil circulation speed can be accelerated by adding oil pumps (two or more are generally installed), so that the cooling effect is better achieved, and the design and operation requirements are met. However, if a plurality of oil pumps are started at the same time, the oil circulation speed may be too high, so that the action of the inner baffle of the heavy gas relay is pushed, and relay protection tripping misoperation is caused.
In order to solve the problem of protection misoperation caused by simultaneous starting of the oil pumps, the starting time difference of the oil pumps is generally controlled through an oil pump starting control loop. As shown in fig. 2, two oil pump start control circuits are described as an example: when the transformer oil temperature sensor PWI senses that the temperature of oil in the transformer exceeds a fixed value (such as 75 ℃), a normally open contact of the transformer oil temperature sensor PWI is closed, the relay K4 is started to excite, and when the manual valves SK1 and SK2 are both closed, the normally open contacts K4-1 and K4-2 corresponding to the relay K4 are both closed, so that the excitation of the relay KM4 can be rapidly driven, and the normally open contact KM4-1 of the relay KM4 is closed to control the starting of the second oil pump MB2; after a certain time delay of the time delay relay KT4, the relay KM2 is driven to be excited, and the normally open contact KM2-1 of the relay KM2 is closed to control the first oil pump MB1 to be started later than the second oil pump MB 2. Therefore, the problem that the relay protection trips and malfunction is caused by the action of the inner baffle of the heavy gas relay is pushed by the too fast oil circulation speed can be solved according to the starting time staggered control of the first oil pump MB1 and the second oil pump MB 2. It should be noted that the above control principle can also be applied in case of overload of the transformer induced load, i.e. overload of the load sensing relay KC, with its normally open contact closed.
However, when the oil pump start control circuit is actually used in the field, the oil pump start control circuit is often affected by factors such as mismatching between types of oil pumps and the time from start to stable operation, aging of the oil pump, and the like, and once the setting time is wrong, a plurality of oil pumps are simultaneously started, so that the phenomenon of tripping and misoperation of relay protection occurs.
Therefore, there is a need for a method for testing the starting time constant value of an internal oil pump of a transformer, which can detect the qualification of the starting time constant value of an oil pump starting control loop before a plurality of oil pumps are put into use, and avoid the occurrence of relay protection tripping misoperation caused by the simultaneous starting of the plurality of oil pumps.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to provide a method for testing the starting time constant value of the oil pump in the transformer, which is used for detecting the qualification of the starting time constant value of the oil pump starting control loop before a plurality of oil pumps are put into use, so that the phenomenon of relay protection tripping misoperation caused by the simultaneous starting of the plurality of oil pumps is avoided.
In order to solve the technical problems, the embodiment of the invention provides a method for testing the starting time constant value of an oil pump in a transformer, which is used for an oil pump starting control loop comprising two oil pumps connected in the transformer;
the oil pump starting control loop comprises an oil temperature induction excitation circuit formed by serially connecting a normally open contact of a transformer oil temperature sensor PWI and a first intermediate relay K4, a load induction excitation circuit formed by serially connecting a normally open contact of a load induction relay KC, a first delay relay KT and a second intermediate relay K04, a first oil pump control circuit formed by serially connecting a first manual valve SK1, a second delay relay KT4, a third intermediate relay KM2, a first normally open contact K4-1 of the first intermediate relay K4 or a first normally open contact K04-1 of the second intermediate relay K04, a second oil pump control circuit formed by serially connecting a second manual valve SK2, a fourth intermediate relay KM4, a second normally open contact K4-2 of the first intermediate relay K4 or a second normally open contact K04-2 of the second intermediate relay K04, and a first oil pump MB1 and a second oil pump MB2; the oil temperature induction excitation circuit, the load induction excitation circuit, the first oil pump control circuit and the second oil pump control circuit are connected to the two ends of the power supply; the first oil pump MB1 is connected with the power supply through a normally open contact KM2-1 of the third intermediate relay KM2, and the second oil pump MB2 is connected with the power supply through a normally open contact KM4-1 of the fourth intermediate relay KM 4; two ends of a first normally open contact K4-1 of the first intermediate relay K4 are connected with two ends of a first normally open contact K04-1 of the second intermediate relay K04 in parallel, and two ends of a second normally open contact K4-2 of the first intermediate relay K4 are connected with two ends of a second normally open contact K04-2 of the second intermediate relay K04 in parallel;
wherein the method comprises the steps of:
detecting connection conditions of all circuits on the oil pump starting control loop;
acquiring the starting time of the first oil pump MB1 and the second oil pump MB2 when all the circuits on the oil pump starting control loop are detected to be normally connected, and when the normally open contact of the first manual valve SK1, the second manual valve SK2 and the transformer oil temperature sensor PWI or the normally open contact of the load sensing relay KC are determined to be closed;
and judging the qualification of the time fixed value of the second delay relay KT4 according to the starting time of the first oil pump MB1 and the second oil pump MB 2.
The specific step of determining the qualification of the time constant value of the second delay relay KT4 according to the start time of the first oil pump MB1 and the second oil pump MB2 includes:
if the difference between the starting time of the first oil pump MB1 and the starting time of the second oil pump MB2 are greater than or equal to a preset threshold value, judging that the time constant value of the second delay relay KT4 is qualified; otherwise, if the difference between the start-up times of the first oil pump MB1 and the second oil pump MB2 is smaller than the preset threshold, the time fixed value of the second delay relay KT4 is determined to be unqualified.
Wherein the method further comprises:
after the time fixed value of the second delay relay KT4 is judged to be unqualified, accumulating and adjusting the time fixed value of the second delay relay KT4 by a fixed value until the difference between the starting time of the first oil pump MB1 and the starting time of the second oil pump MB2 is larger than or equal to the preset threshold value.
When the time constant value of the second delay relay KT4 is qualified, the time constant value of the second delay relay KT4 is more than or equal to 30S; and when the time constant value of the second delay relay KT4 is unqualified, the time constant value of the second delay relay KT4 is smaller than 30S.
The normally open contact of the transformer oil temperature sensor PWI and the normally open contact of the load sensing relay KC are closed in a short circuit mode.
The embodiment of the invention also provides a system for testing the fixed value of the starting time of the oil pump in the transformer, which is used for an oil pump starting control loop comprising two oil pumps connected in the transformer;
the oil pump starting control loop comprises an oil temperature induction excitation circuit formed by serially connecting a normally open contact of a transformer oil temperature sensor PWI and a first intermediate relay K4, a load induction excitation circuit formed by serially connecting a normally open contact of a load induction relay KC, a first delay relay KT and a second intermediate relay K04, a first oil pump control circuit formed by serially connecting a first manual valve SK1, a second delay relay KT4, a third intermediate relay KM2, a first normally open contact K4-1 of the first intermediate relay K4 or a first normally open contact K04-1 of the second intermediate relay K04, a second oil pump control circuit formed by serially connecting a second manual valve SK2, a fourth intermediate relay KM4, a second normally open contact K4-2 of the first intermediate relay K4 or a second normally open contact K04-2 of the second intermediate relay K04, and a first oil pump MB1 and a second oil pump MB2; the oil temperature induction excitation circuit, the load induction excitation circuit, the first oil pump control circuit and the second oil pump control circuit are connected to the two ends of the power supply; the first oil pump MB1 is connected with the power supply through a normally open contact KM2-1 of the third intermediate relay KM2, and the second oil pump MB2 is connected with the power supply through a normally open contact KM4-1 of the fourth intermediate relay KM 4; two ends of a first normally open contact K4-1 of the first intermediate relay K4 are connected with two ends of a first normally open contact K04-1 of the second intermediate relay K04 in parallel, and two ends of a second normally open contact K4-2 of the first intermediate relay K4 are connected with two ends of a second normally open contact K04-2 of the second intermediate relay K04 in parallel;
wherein, include:
the circuit detection unit is used for detecting connection conditions of all circuits on the oil pump starting control loop;
a relay protection action state identification unit, configured to obtain start time of the first oil pump MB1 and the second oil pump MB2 when it is detected that all lines on the oil pump start control loop are normally connected, and when it is determined that normally open contacts of the first manual valve SK1, the second manual valve SK2, the transformer oil temperature sensor PWI, or a normally open contact of the load sensing relay KC are all closed;
and the time fixed value qualification judging unit is used for judging the qualification of the time fixed value of the second delay relay KT4 according to the starting time of the first oil pump MB1 and the second oil pump MB 2.
Wherein, still include:
and the time fixed value disqualification adjusting unit is used for accumulating and adjusting the time fixed value of the second delay relay KT4 by a fixed value after the time fixed value of the second delay relay KT4 is disqualified until the difference between the starting time of the first oil pump MB1 and the starting time of the second oil pump MB2 is larger than or equal to a preset threshold value.
When the time constant value of the second delay relay KT4 is qualified, the time constant value of the second delay relay KT4 is more than or equal to 30S; and when the time constant value of the second delay relay KT4 is unqualified, the time constant value of the second delay relay KT4 is smaller than 30S.
The embodiment of the invention has the following beneficial effects:
according to the protection action state of the relay protection device when the normally open contact of the first manual valve SK1, the second manual valve SK2 and the transformer oil temperature sensor PWI or the normally open contact of the load sensing relay KC on the oil pump starting control loop are closed, the qualification of the time constant value of the second delay relay KT4 is judged, and therefore the qualification detection of the starting time constant value of the oil pump starting control loop before a plurality of oil pumps are put into use can be achieved, and the phenomenon that relay protection tripping is performed by misoperation due to the simultaneous starting of the plurality of oil pumps is avoided.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are required in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that it is within the scope of the invention to one skilled in the art to obtain other drawings from these drawings without inventive faculty.
FIG. 1 is a schematic diagram of the operation of heavy gas protection in the event of internal failure of a transformer in the prior art;
FIG. 2 is a schematic diagram of the operation of two oil pump start control circuits inside a transformer in the prior art;
FIG. 3 is a flowchart of a method for testing the starting time constant of an internal oil pump of a transformer according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a system for testing a fixed value of a start time of an internal oil pump of a transformer according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, for the purpose of making the objects, technical solutions and advantages of the present invention more apparent.
Fig. 3 shows a method for testing the starting time constant value of an internal oil pump of a transformer, which is provided in an embodiment of the present invention, and is used for an oil pump starting control loop including two oil pumps connected to the internal oil pump of the transformer;
the oil pump starting control loop can be shown by referring to fig. 2, and specifically comprises an oil temperature induction excitation circuit formed by serially connecting a normally open contact of a transformer oil temperature sensor PWI and a first intermediate relay K4, a load induction excitation circuit formed by serially connecting a normally open contact of a load induction relay KC, a first delay relay KT and a second intermediate relay K04, a first oil pump control circuit formed by serially connecting a first manual valve SK1, a second delay relay KT4, a third intermediate relay KM2, a first normally open contact K4-1 of the first intermediate relay K4 or a first normally open contact K04-1 of the second intermediate relay K04, a second oil pump control circuit formed by serially connecting a second manual valve SK2, a fourth intermediate relay KM4, a second normally open contact K4-2 of the first intermediate relay K4 or a second normally open contact K04-2 of the second intermediate relay K04, and a first oil pump MB1 and a second oil pump MB2; the oil temperature induction excitation circuit, the load induction excitation circuit, the first oil pump control circuit and the second oil pump control circuit are connected with two ends (such as C phase and N phase) of the power supply; the first oil pump MB1 is connected with a power supply (such as ABC three phases) through a normally open contact KM2-1 of a third intermediate relay KM2, and the second oil pump MB2 is connected with the power supply (such as ABC three phases) through a normally open contact KM4-1 of a fourth intermediate relay KM 4; the two ends of a first normally open contact K4-1 of the first intermediate relay K4 are connected with the two ends of a first normally open contact K04-1 of the second intermediate relay K04 in parallel, and the two ends of a second normally open contact K4-2 of the first intermediate relay K4 are connected with the two ends of a second normally open contact K04-2 of the second intermediate relay K04 in parallel;
wherein the method comprises the steps of:
step S1, detecting connection conditions of all circuits on the oil pump starting control loop;
the detection results obtained by conducting or disconnecting detection on each circuit through the detection equipment are used as connection conditions of all circuits on the oil pump starting control circuit and are imported into the computer equipment.
Step S2, when all lines on the oil pump starting control loop are detected to be normally connected, and when it is determined that the normally open contacts of the first manual valve SK1, the second manual valve SK2 and the transformer oil temperature sensor PWI or the normally open contact of the load sensing relay KC are closed, starting time of the first oil pump MB1 and the second oil pump MB2 is acquired;
after detecting that all circuits on an oil pump starting control loop are normally connected, firstly controlling a normally open contact of a first manual valve SK1, a second manual valve SK2 and a transformer oil temperature sensor PWI or a normally open contact of a load sensing relay KC to be closed, for example, closing or opening the normally open contact of the transformer oil temperature sensor PWI and the normally open contact of the load sensing relay KC in a short circuit mode, wherein the first manual valve SK1 and the second manual valve SK2 can be closed or opened in a manual mode or a circuit switch design mode;
secondly, since the oil pump start control circuit is conducted, the first oil pump MB1 and the second oil pump MB2 can be started (simultaneously started or started in a staggered manner), and the respective start times of the first oil pump MB1 and the second oil pump MB2 can be obtained. It should be noted that the respective start times of the first oil pump MB1 and the second oil pump MB2 may be obtained by collecting start signals of the first oil pump MB1 and the second oil pump MB2 by the respective sensors.
And step S3, judging the qualification of the time constant value of the second delay relay KT4 according to the starting time of the first oil pump MB1 and the second oil pump MB 2.
The specific process is that if the difference between the starting time of the first oil pump MB1 and the starting time of the second oil pump MB2 is larger than or equal to a preset threshold (such as 30S), the time fixed value of the second delay relay KT4 is judged to be qualified; otherwise, if the difference between the start-up times of the first oil pump MB1 and the second oil pump MB2 is smaller than the preset threshold, the time fixed value of the second delay relay KT4 is determined to be unqualified. When the time constant value of the second delay relay KT4 is qualified, the time constant value of the second delay relay KT4 is more than or equal to 30S; and when the time constant value of the second delay relay KT4 is not qualified, the time constant value of the second delay relay KT4 is smaller than 30S. It should be noted that the specific design of the time constant can be adjusted according to the actual requirements.
It is to be understood that the condition for determining the eligibility of the time constant value of the second time delay relay KT4 is not limited to the difference in the activation times of the first oil pump MB1 and the second oil pump MB2, but may be realized by other means.
In the embodiment of the present invention, when the time constant value of the second delay relay KT4 is not qualified, the time constant value may be corrected to satisfy the final qualification, so the method further includes:
after the time fixed value of the second delay relay KT4 is judged to be unqualified, the time fixed value of the second delay relay KT4 is accumulated and adjusted by a fixed value until the difference between the starting time of the first oil pump MB1 and the starting time of the second oil pump MB2 are larger than or equal to a preset threshold value.
It can be understood that the method for testing the starting time constant value of the internal oil pump of the transformer in the embodiment of the invention is not limited to the oil pump starting control loop comprising two oil pumps connected in the transformer, but can be used for more than two oil pumps, and the specific starting control loop can be modified correspondingly according to the oil pump starting control loop comprising two oil pumps connected in the transformer, for example, a third oil pump control circuit, a fourth oil pump control circuit and the like corresponding to the second oil pump control circuit are additionally arranged, and the time delay time constant value of the delay relay in each additionally arranged oil pump control circuit is different, so that each oil pump can be started in a staggered manner is required to be satisfied, and the description is omitted.
It can be understood that the delay time fixed value of the first delay relay KT in the load induction exciting circuit can be designed according to the requirement, and only the condition that the load induction exciting circuit and the oil temperature induction exciting circuit do not perform induction action simultaneously is ensured.
Fig. 4 shows a system for testing the starting time constant of an internal oil pump of a transformer, which is provided in an embodiment of the present invention and is used for an oil pump starting control loop including two oil pumps connected to the internal oil pump of the transformer;
the oil pump starting control loop comprises an oil temperature induction excitation circuit formed by serially connecting a normally open contact of a transformer oil temperature sensor PWI and a first intermediate relay K4, a load induction excitation circuit formed by serially connecting a normally open contact of a load induction relay KC, a first delay relay KT and a second intermediate relay K04, a first oil pump control circuit formed by serially connecting a first manual valve SK1, a second delay relay KT4, a third intermediate relay KM2, a first normally open contact K4-1 of the first intermediate relay K4 or a first normally open contact K04-1 of the second intermediate relay K04, a second oil pump control circuit formed by serially connecting a second manual valve SK2, a fourth intermediate relay KM4, a second normally open contact K4-2 of the first intermediate relay K4 or a second normally open contact K04-2 of the second intermediate relay K04, and a first oil pump MB1 and a second oil pump MB2; the oil temperature induction excitation circuit, the load induction excitation circuit, the first oil pump control circuit and the second oil pump control circuit are connected to the two ends of the power supply; the first oil pump MB1 is connected with the power supply through a normally open contact KM2-1 of the third intermediate relay KM2, and the second oil pump MB2 is connected with the power supply through a normally open contact KM4-1 of the fourth intermediate relay KM 4; two ends of a first normally open contact K4-1 of the first intermediate relay K4 are connected with two ends of a first normally open contact K04-1 of the second intermediate relay K04 in parallel, and two ends of a second normally open contact K4-2 of the first intermediate relay K4 are connected with two ends of a second normally open contact K04-2 of the second intermediate relay K04 in parallel;
wherein, include:
a circuit detection unit 110, configured to detect connection conditions of all circuits on the oil pump start control circuit;
a relay protection action state identification unit 120, configured to obtain start-up time of the first oil pump MB1 and the second oil pump MB2 when it is detected that all lines on the oil pump start-up control circuit are normally connected, and when it is determined that the normally open contacts of the first manual valve SK1, the second manual valve SK2, the transformer oil temperature sensor PWI, or the normally open contact of the load sensing relay KC are all closed;
and a time-constant eligibility determination unit 130, configured to determine eligibility of the time constant value of the second delay relay KT4 according to start times of the first oil pump MB1 and the second oil pump MB 2.
Wherein, still include:
and the time fixed value disqualification adjusting unit 140 is configured to perform accumulated adjustment on the time fixed value of the second delay relay KT4 by a fixed value after the time fixed value of the second delay relay KT4 is disqualified until the difference between the start time of the first oil pump MB1 and the start time of the second oil pump MB2 is greater than or equal to a preset threshold.
When the time constant value of the second delay relay KT4 is qualified, the time constant value of the second delay relay KT4 is more than or equal to 30S; and when the time constant value of the second delay relay KT4 is unqualified, the time constant value of the second delay relay KT4 is smaller than 30S.
The embodiment of the invention has the following beneficial effects:
according to the protection action state of the relay protection device when the normally open contact of the first manual valve SK1, the second manual valve SK2 and the transformer oil temperature sensor PWI or the normally open contact of the load sensing relay KC on the oil pump starting control loop are closed, the qualification of the time constant value of the second delay relay KT4 is judged, and therefore the qualification detection of the starting time constant value of the oil pump starting control loop before a plurality of oil pumps are put into use can be achieved, and the phenomenon that relay protection tripping is performed by misoperation due to the simultaneous starting of the plurality of oil pumps is avoided.
It should be noted that, in the above system embodiment, each unit included is only divided according to the functional logic, but not limited to the above division, so long as the corresponding function can be implemented; in addition, the specific names of the functional units are also only for distinguishing from each other, and are not used to limit the protection scope of the present invention.
Those of ordinary skill in the art will appreciate that all or a portion of the steps in implementing the methods of the above embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc.
The foregoing disclosure is illustrative of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims.
Claims (6)
1. A method for testing the starting time constant value of an oil pump in a transformer is used for an oil pump starting control loop comprising two oil pumps connected in the transformer;
the oil pump starting control loop comprises an oil temperature induction excitation circuit formed by serially connecting a normally open contact of a transformer oil temperature sensor PWI and a first intermediate relay K4, a load induction excitation circuit formed by serially connecting a normally open contact of a load induction relay KC, a first delay relay KT and a second intermediate relay K04, a first oil pump control circuit formed by serially connecting a first manual valve SK1, a second delay relay KT4, a third intermediate relay KM2, a first normally open contact K4-1 of the first intermediate relay K4 or a first normally open contact K04-1 of the second intermediate relay K04, a second oil pump control circuit formed by serially connecting a second manual valve SK2, a fourth intermediate relay KM4, a second normally open contact K4-2 of the first intermediate relay K4 or a second normally open contact K04-2 of the second intermediate relay K04, and a first oil pump MB1 and a second oil pump MB2; the oil temperature induction excitation circuit, the load induction excitation circuit, the first oil pump control circuit and the second oil pump control circuit are connected to the two ends of the power supply; the first oil pump MB1 is connected with the power supply through a normally open contact KM2-1 of the third intermediate relay KM2, and the second oil pump MB2 is connected with the power supply through a normally open contact KM4-1 of the fourth intermediate relay KM 4; two ends of a first normally open contact K4-1 of the first intermediate relay K4 are connected with two ends of a first normally open contact K04-1 of the second intermediate relay K04 in parallel, and two ends of a second normally open contact K4-2 of the first intermediate relay K4 are connected with two ends of a second normally open contact K04-2 of the second intermediate relay K04 in parallel;
characterized in that the method comprises the steps of:
detecting connection conditions of all circuits on the oil pump starting control loop;
acquiring the starting time of the first oil pump MB1 and the second oil pump MB2 when all the circuits on the oil pump starting control loop are detected to be normally connected, and when the normally open contact of the first manual valve SK1, the second manual valve SK2 and the transformer oil temperature sensor PWI or the normally open contact of the load sensing relay KC are determined to be closed;
judging the qualification of the time constant value of the second delay relay KT4 according to the starting time of the first oil pump MB1 and the second oil pump MB2;
wherein the method further comprises:
after the time fixed value of the second delay relay KT4 is judged to be unqualified, accumulating and adjusting the time fixed value of the second delay relay KT4 by a fixed value until the difference between the starting time of the first oil pump MB1 and the starting time of the second oil pump MB2 is larger than or equal to a preset threshold value.
2. The method for testing the fixed value of the start time of the internal oil pump of the transformer according to claim 1, wherein the specific step of determining the qualification of the fixed value of the second delay relay KT4 according to the start time of the first oil pump MB1 and the second oil pump MB2 comprises the following steps:
if the difference between the starting time of the first oil pump MB1 and the starting time of the second oil pump MB2 are greater than or equal to a preset threshold value, judging that the time constant value of the second delay relay KT4 is qualified; otherwise, if the difference between the start-up times of the first oil pump MB1 and the second oil pump MB2 is smaller than the preset threshold, the time fixed value of the second delay relay KT4 is determined to be unqualified.
3. The method for testing the fixed value of the starting time of the oil pump in the transformer according to claim 2, wherein when the fixed value of the second delay relay KT4 is qualified, the fixed value of the second delay relay KT4 is more than or equal to 30S; and when the time constant value of the second delay relay KT4 is unqualified, the time constant value of the second delay relay KT4 is smaller than 30S.
4. The method for testing the fixed value of the starting time of the oil pump in the transformer according to claim 1, wherein the normally open contact of the transformer oil temperature sensor PWI and the normally open contact of the load sensing relay KC are closed by a short circuit mode.
5. The system is used for an oil pump starting control loop connected with two oil pumps in the transformer;
the oil pump starting control loop comprises an oil temperature induction excitation circuit formed by serially connecting a normally open contact of a transformer oil temperature sensor PWI and a first intermediate relay K4, a load induction excitation circuit formed by serially connecting a normally open contact of a load induction relay KC, a first delay relay KT and a second intermediate relay K04, a first oil pump control circuit formed by serially connecting a first manual valve SK1, a second delay relay KT4, a third intermediate relay KM2, a first normally open contact K4-1 of the first intermediate relay K4 or a first normally open contact K04-1 of the second intermediate relay K04, a second oil pump control circuit formed by serially connecting a second manual valve SK2, a fourth intermediate relay KM4, a second normally open contact K4-2 of the first intermediate relay K4 or a second normally open contact K04-2 of the second intermediate relay K04, and a first oil pump MB1 and a second oil pump MB2; the oil temperature induction excitation circuit, the load induction excitation circuit, the first oil pump control circuit and the second oil pump control circuit are connected to the two ends of the power supply; the first oil pump MB1 is connected with the power supply through a normally open contact KM2-1 of the third intermediate relay KM2, and the second oil pump MB2 is connected with the power supply through a normally open contact KM4-1 of the fourth intermediate relay KM 4; two ends of a first normally open contact K4-1 of the first intermediate relay K4 are connected with two ends of a first normally open contact K04-1 of the second intermediate relay K04 in parallel, and two ends of a second normally open contact K4-2 of the first intermediate relay K4 are connected with two ends of a second normally open contact K04-2 of the second intermediate relay K04 in parallel;
characterized by comprising the following steps:
the circuit detection unit is used for detecting connection conditions of all circuits on the oil pump starting control loop;
a relay protection action state identification unit, configured to obtain start time of the first oil pump MB1 and the second oil pump MB2 when it is detected that all lines on the oil pump start control loop are normally connected, and when it is determined that normally open contacts of the first manual valve SK1, the second manual valve SK2, the transformer oil temperature sensor PWI, or a normally open contact of the load sensing relay KC are all closed;
a time constant value qualification judging unit, configured to judge the qualification of the time constant value of the second delay relay KT4 according to the start time of the first oil pump MB1 and the second oil pump MB2;
wherein, still include:
and the time fixed value disqualification adjusting unit is used for accumulating and adjusting the time fixed value of the second delay relay KT4 by a fixed value after the time fixed value of the second delay relay KT4 is disqualified until the difference between the starting time of the first oil pump MB1 and the starting time of the second oil pump MB2 is larger than or equal to a preset threshold value.
6. The system for testing the fixed value of the starting time of the oil pump in the transformer according to claim 5, wherein when the fixed value of the second delay relay KT4 is qualified, the fixed value of the second delay relay KT4 is more than or equal to 30S; and when the time constant value of the second delay relay KT4 is unqualified, the time constant value of the second delay relay KT4 is smaller than 30S.
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