CN111986901A - Method and system for testing starting time constant value of oil pump in transformer - Google Patents
Method and system for testing starting time constant value of oil pump in transformer Download PDFInfo
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- CN111986901A CN111986901A CN202010718119.8A CN202010718119A CN111986901A CN 111986901 A CN111986901 A CN 111986901A CN 202010718119 A CN202010718119 A CN 202010718119A CN 111986901 A CN111986901 A CN 111986901A
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- relay
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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
-
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Transformer Cooling (AREA)
Abstract
The invention provides a method for testing the starting time fixed 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, and comprises the steps of detecting the connection condition of all lines on the oil pump starting control loop; when all lines on the oil pump starting control circuit are detected to be normally connected and the normally open contacts of the first manual valve SK1, the second manual valve SK2, the transformer oil temperature sensor PWI or the load sensing relay KC are determined to be closed, the starting time of the first oil pump MB1 and the second oil pump MB2 is obtained; the acceptability of the time set value of the second time delay relay KT4 is determined according to the starting times of the first oil pump MB1 and the second oil pump MB 2. By implementing the invention, the qualification of the starting time constant value of the oil pump starting control loop before the plurality of oil pumps are put into use is detected, and the phenomenon that the relay protection is tripped due to 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 starting time fixed value of an oil pump in a transformer.
Background
In an electric power system, a gas relay, also called a heavy gas relay, is a protection element of a transformer and discriminates hot oil flow and hot gas which generate certain driving force when the transformer has an internal fault. Therefore, the transformer is provided with differential protection for preventing the transformer from faults of various elements such as a transformer bushing, an outgoing line, a current transformer, a coil, an iron core and the like as main protection, and is also provided with heavy gas protection as main protection. The working principle of the heavy gas protection is that if a discharge fault occurs inside an oil-filled transformer, an electric arc is discharged to enable the transformer oil to be decomposed into various characteristic gases such as methane, acetylene, hydrogen, carbon monoxide, carbon dioxide, ethylene, ethane and the like, and in the process that the characteristic gases rise into an oil pipe to an upper oil tank and impact on an oil conservator, an inner baffle at one end of the heavy gas relay is pushed to act, so that a normally open contact at the other end of the heavy gas relay is closed, and therefore a relay protection trip is started, and the purpose of removing the fault of the transformer is achieved, as shown in fig. 1.
For a large-capacity transformer, the oil circulation speed can be accelerated by increasing oil pumps (generally installing two or more oil pumps), and the cooling effect can be better achieved so as to meet the design and operation requirements. However, if a plurality of oil pumps are started simultaneously, the oil circulation speed is too high, so that the inner baffle of the heavy gas relay is pushed to act, and the relay protection is tripped and operated mistakenly.
In order to solve the problem of protection misoperation caused by the simultaneous starting of the plurality of oil pumps, the starting time difference of the plurality of oil pumps is usually controlled by an oil pump starting control loop. As shown in fig. 2, two oil pump start control circuits are taken as an example for explanation: when the transformer oil temperature sensor PWI senses that the temperature of oil in a 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 be excited, and when the manual valve SK1 and the manual valve SK2 are both closed, normally open contacts K4-1 and K4-2 corresponding to the relay K4 are both closed, so that the relay KM4 can be driven to be excited quickly, and the normally open contact KM4-1 of the relay KM4 is closed to control the second oil pump MB2 to be started; and after a certain time delay through a time delay relay KT4, the relay KM2 is driven to be excited, and a 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 is tripped due to the pushing of the inner baffle of the heavy gas relay due to the excessively high oil circulation speed can be solved by controlling the starting time of the first oil pump MB1 and the starting time of the second oil pump MB2 to be staggered. It should be noted that the above control principle can also be applied in the case of a transformer sensing overload, i.e. in the case of an overload of the load sensing relay KC, with its normally open contacts closed.
However, when the oil pump start control circuit is actually used on site, the oil pump start control circuit is often influenced by factors such as mismatch between oil pumps in type, starting time and stable running time, aging of the oil pumps and the like, and once the setting time is wrong, the phenomenon that a plurality of oil pumps are started simultaneously to cause tripping of relay protection is caused to be mistaken occurs.
Therefore, there is a need for a method for testing a starting time constant value of an oil pump in a transformer, which is used for performing a qualification test on the starting time constant value of an oil pump starting control circuit before a plurality of oil pumps are put into use, so as to avoid the occurrence of a phenomenon that a relay protection trip is mistakenly operated due to 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 an oil pump in a transformer, which is used for detecting 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, so that the phenomenon that the relay protection is tripped and is mistakenly operated due to the simultaneous starting of the plurality of oil pumps is avoided.
In order to solve the technical problem, an embodiment of the present invention provides a method for testing a starting time fixed value of an oil pump inside a transformer, which is used for an oil pump starting control loop including two oil pumps connected inside the transformer;
the oil pump starting control loop comprises an oil temperature sensing excitation circuit formed by connecting a normally open contact of a transformer oil temperature sensor PWI and a first intermediate relay K4 in series, a load sensing excitation circuit formed by connecting a normally open contact of a load sensing relay KC, a first time delay relay KT and a second intermediate relay K04 in series, a first manual valve SK1, a second time delay relay KT4 and a third intermediate relay KM2, the first oil pump control circuit is formed by connecting a first normally open contact K4-1 of a first intermediate relay K4 or a first normally open contact K04-1 of a second intermediate relay K04 in series, the second oil pump control circuit is formed by connecting a second manual valve SK2, a fourth intermediate relay KM4, a second normally open contact K4-2 of a first intermediate relay K4 or a second normally open contact K04-2 of a second intermediate relay K04 in series, and a first oil pump MB1 and a second oil pump MB2 are arranged in series; the two ends of 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 the connection condition of all lines on the oil pump starting control loop;
when all lines on the oil pump starting control circuit are detected to be normally connected and when the first manual valve SK1, the second manual valve SK2, the normally open contact of the transformer oil temperature sensor PWI or the normally open contact of the load sensing relay KC are determined to be closed, the starting time of the first oil pump MB1 and the second oil pump MB2 is obtained;
and determining the qualification of the time constant value of the second time delay relay KT4 according to the starting time of the first oil pump MB1 and the second oil pump MB 2.
The specific steps of judging the qualification of the time constant value of the second time delay relay KT4 according to the starting time of the first oil pump MB1 and the second oil pump MB2 comprise:
if the difference between the starting time of the first oil pump MB1 and the starting time of the second oil pump MB2 is greater than or equal to a preset threshold value, the time constant value of the second time delay relay KT4 is judged to be qualified; on the contrary, if the difference between the starting time of the first oil pump MB1 and the starting time of the second oil pump MB2 is smaller than the preset threshold value, the time fixed value of the second time delay relay KT4 is determined to be unqualified.
Wherein the method further comprises:
and after the time constant value of the second time delay relay KT4 is judged to be unqualified, accumulating and adjusting the time constant value of the second time 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 greater than or equal to the preset threshold value.
When the time constant value of the second time delay relay KT4 is qualified, the time constant value of the second time delay relay KT4 is greater than or equal to 30S; and when the time constant value of the second time delay relay KT4 is unqualified, the time constant value of the second time delay relay KT4 is less than 30S.
The normally open contact of the transformer oil temperature sensor PWI and the normally open contact of the load induction relay KC are closed in a short circuit mode.
The embodiment of the invention also provides a system for testing the starting time fixed value of the oil pump in the transformer, which is used for comprising an oil pump starting control loop connected with the two oil pumps in the transformer;
the oil pump starting control loop comprises an oil temperature sensing excitation circuit formed by connecting a normally open contact of a transformer oil temperature sensor PWI and a first intermediate relay K4 in series, a load sensing excitation circuit formed by connecting a normally open contact of a load sensing relay KC, a first time delay relay KT and a second intermediate relay K04 in series, a first manual valve SK1, a second time delay relay KT4 and a third intermediate relay KM2, the first oil pump control circuit is formed by connecting a first normally open contact K4-1 of a first intermediate relay K4 or a first normally open contact K04-1 of a second intermediate relay K04 in series, the second oil pump control circuit is formed by connecting a second manual valve SK2, a fourth intermediate relay KM4, a second normally open contact K4-2 of a first intermediate relay K4 or a second normally open contact K04-2 of a second intermediate relay K04 in series, and a first oil pump MB1 and a second oil pump MB2 are arranged in series; the two ends of 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 the connection condition 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 detecting that all lines on the oil pump start control circuit are connected normally and determining that the first manual valve SK1, the second manual valve SK2, and a normally open contact of the transformer oil temperature sensor PWI or a normally open contact of the load induction relay KC are all closed;
and the time constant value qualification judging unit is used for judging the qualification of the time constant value of the second time 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 unqualified time constant value adjusting unit is used for accumulating and adjusting the time constant value of the second time delay relay KT4 by a fixed value after the time constant value of the second time delay relay KT4 is judged to be unqualified until the difference between the starting time of the first oil pump MB1 and the starting time of the second oil pump MB2 is greater than or equal to a preset threshold value.
When the time constant value of the second time delay relay KT4 is qualified, the time constant value of the second time delay relay KT4 is greater than or equal to 30S; and when the time constant value of the second time delay relay KT4 is unqualified, the time constant value of the second time delay relay KT4 is less than 30S.
The embodiment of the invention has the following beneficial effects:
according to the invention, the qualification of the time constant value of the second time delay relay KT4 is judged according to the protection action state of the relay protection device when the normally open contacts of the first manual valve SK1, the second manual valve SK2, the transformer oil temperature sensor PWI and the load induction relay KC on the oil pump starting control loop are closed, thereby realizing 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, and avoiding the phenomenon of tripping of relay protection due to the simultaneous starting of the plurality of oil pumps.
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 introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive exercise.
FIG. 1 is a schematic diagram of heavy gas protection during an internal fault 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 a starting time of an oil pump inside a transformer according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a system for testing start time and fixed value of an oil pump inside a transformer according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 3, in an embodiment of the present invention, a method for testing a starting time fixed value of an oil pump inside a transformer is provided, which is used for an oil pump starting control loop including two oil pumps connected inside the transformer;
the oil pump starting control circuit can be seen from a figure 2, and concretely comprises an oil temperature induction excitation circuit formed by connecting a normally open contact of a transformer oil temperature sensor PWI and a first intermediate relay K4 in series, a normally open contact of a load induction relay KC, a load induction excitation circuit formed by connecting a first time delay relay KT and a second intermediate relay K04 in series, a first oil pump control circuit formed by connecting a first manual valve SK1, a second time 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 in series, a second oil pump control circuit formed by 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 in series, and a second oil pump control circuit formed by connecting a second normally open contact K, A first oil pump MB1 and a second oil pump MB 2; wherein, the two ends of 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 all connected with the two ends of the power supply (such as C phase and N phase); the first oil pump MB1 is connected with a power supply (such as ABC three-phase) 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-phase) through a normally open contact KM4-1 of a 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:
step S1, detecting the connection condition of all lines on the oil pump starting control loop;
the specific process is that the detection result obtained by detecting the connection or disconnection of each line through the detection equipment is used as the connection condition of all lines on the oil pump starting control loop and is led into the computer equipment.
Step S2, when all lines on the oil pump starting control circuit are detected to be normally connected and when the first manual valve SK1, the second manual valve SK2, the normally open contact of the transformer oil temperature sensor PWI or the normally open contact of the load sensing relay KC are determined to be closed, the starting time of the first oil pump MB1 and the second oil pump MB2 is obtained;
the method comprises the specific processes that after all lines on an oil pump starting control loop are detected to be normally connected, firstly, a first manual valve SK1, a second manual valve SK2, a normally open contact of a transformer oil temperature sensor PWI or a normally open contact of a load induction relay KC are controlled to be closed, for example, the normally open contact of the transformer oil temperature sensor PWI and the normally open contact of the load induction relay KC are closed or opened in a short circuit mode, and the first manual valve SK1 and the second manual valve SK2 can be closed or opened manually or by designing circuit switches and the like;
secondly, since the oil pump start control circuit is rendered conductive, the first oil pump MB1 and the second oil pump MB2 can be started (simultaneously started or staggered started), 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 and second oil pumps MB1 and MB2 may be obtained by collecting start signals of the first and second oil pumps MB1 and MB2 by respective sensors.
And step S3, judging the qualification of the time constant value of the second time 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 greater than or equal to a preset threshold (such as 30S), the time constant value of the second time delay relay KT4 is judged to be qualified; on the contrary, if the difference between the starting time of the first oil pump MB1 and the starting time of the second oil pump MB2 is smaller than the preset threshold, the time constant value of the second time delay relay KT4 is determined to be unqualified. When the time constant value of the second time delay relay KT4 is qualified, the time constant value of the second time delay relay KT4 is more than or equal to 30S; when the time constant value of the second time delay relay KT4 is unqualified, the time constant value of the second time delay relay KT4 is less 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 determination condition for the eligibility of the time constant of the second delay relay KT4 is not limited to only the difference between the activation times of the first oil pump MB1 and the second oil pump MB2, but may be implemented in other ways.
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 meet the final qualification, and therefore the method further includes:
after the time constant value of the second time delay relay KT4 is determined to be unqualified, the time constant value of the second time delay relay KT4 is subjected to accumulation adjustment 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 greater than or equal to a preset threshold value.
It can be understood that the method for testing the starting time constant value of the oil pump inside the transformer in the embodiment of the present invention is not limited to the oil pump starting control loops including two oil pumps connected inside the transformer, but can also be used for the oil pump starting control loops of more than two oil pumps, and a specific starting control loop may be modified according to the oil pump starting control loops including two oil pumps connected inside the transformer, for example, third and fourth oil pump control circuits corresponding to the second oil pump control circuit are added, and at this time, the delay time constant values of the delay relays in each added oil pump control circuit are different, and it is necessary to meet the requirement that each oil pump can be started in a staggered manner, and details are not repeated herein.
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 as required, and only the load induction exciting circuit is required to be ensured not to be simultaneously inducted with the oil temperature induction exciting circuit.
As shown in fig. 4, in an embodiment of the present invention, a system for testing a start time fixed value of an oil pump inside a transformer is provided, which is used for an oil pump start control loop connected to two oil pumps inside the transformer;
the oil pump starting control loop comprises an oil temperature sensing excitation circuit formed by connecting a normally open contact of a transformer oil temperature sensor PWI and a first intermediate relay K4 in series, a load sensing excitation circuit formed by connecting a normally open contact of a load sensing relay KC, a first time delay relay KT and a second intermediate relay K04 in series, a first manual valve SK1, a second time delay relay KT4 and a third intermediate relay KM2, the first oil pump control circuit is formed by connecting a first normally open contact K4-1 of a first intermediate relay K4 or a first normally open contact K04-1 of a second intermediate relay K04 in series, the second oil pump control circuit is formed by connecting a second manual valve SK2, a fourth intermediate relay KM4, a second normally open contact K4-2 of a first intermediate relay K4 or a second normally open contact K04-2 of a second intermediate relay K04 in series, and a first oil pump MB1 and a second oil pump MB2 are arranged in series; the two ends of 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 line detection unit 110 is used for detecting the connection condition of all lines on the oil pump starting control loop;
a relay protection action state identification unit 120, configured to obtain start times 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 circuit are connected normally and it is determined that the first manual valve SK1, the second manual valve SK2, and a normally open contact of 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 determination unit 130, configured to determine the qualification of the time constant value of the second time 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 unqualified time constant value adjusting unit 140 is configured to, after the time constant value of the second time delay relay KT4 is judged to be unqualified, add and adjust the time constant value of the second time delay relay KT4 by a fixed value until the difference between the starting times of the first oil pump MB1 and the second oil pump MB2 is greater than or equal to a preset threshold value.
When the time constant value of the second time delay relay KT4 is qualified, the time constant value of the second time delay relay KT4 is greater than or equal to 30S; and when the time constant value of the second time delay relay KT4 is unqualified, the time constant value of the second time delay relay KT4 is less than 30S.
The embodiment of the invention has the following beneficial effects:
according to the invention, the qualification of the time constant value of the second time delay relay KT4 is judged according to the protection action state of the relay protection device when the normally open contacts of the first manual valve SK1, the second manual valve SK2, the transformer oil temperature sensor PWI and the load induction relay KC on the oil pump starting control loop are closed, thereby realizing 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, and avoiding the phenomenon of tripping of relay protection due to the simultaneous starting of the plurality of oil pumps.
It should be noted that, in the above system embodiment, each included unit is only divided according to functional logic, but is not limited to the above division as long as the corresponding function can be implemented; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
It will be understood by those skilled in the art that all or part of the steps in the method for implementing the above embodiments may be implemented by relevant hardware instructed by a program, and the program may be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (8)
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 which is connected with two oil pumps in the transformer;
the oil pump starting control loop comprises an oil temperature sensing excitation circuit formed by connecting a normally open contact of a transformer oil temperature sensor PWI and a first intermediate relay K4 in series, a load sensing excitation circuit formed by connecting a normally open contact of a load sensing relay KC, a first time delay relay KT and a second intermediate relay K04 in series, a first manual valve SK1, a second time delay relay KT4 and a third intermediate relay KM2, the first oil pump control circuit is formed by connecting a first normally open contact K4-1 of a first intermediate relay K4 or a first normally open contact K04-1 of a second intermediate relay K04 in series, the second oil pump control circuit is formed by connecting a second manual valve SK2, a fourth intermediate relay KM4, a second normally open contact K4-2 of a first intermediate relay K4 or a second normally open contact K04-2 of a second intermediate relay K04 in series, and a first oil pump MB1 and a second oil pump MB2 are arranged in series; the two ends of 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 following steps:
detecting the connection condition of all lines on the oil pump starting control loop;
when all lines on the oil pump starting control circuit are detected to be normally connected and when the first manual valve SK1, the second manual valve SK2, the normally open contact of the transformer oil temperature sensor PWI or the normally open contact of the load sensing relay KC are determined to be closed, the starting time of the first oil pump MB1 and the second oil pump MB2 is obtained;
and determining the qualification of the time constant value of the second time delay relay KT4 according to the starting time of the first oil pump MB1 and the second oil pump MB 2.
2. The method for testing the starting time constant value of the oil pump in the transformer as claimed in claim 1, wherein the specific steps for determining the eligibility of the time constant value of the second time delay relay KT4 according to the starting time of the first oil pump MB1 and the second oil pump MB2 comprise:
if the difference between the starting time of the first oil pump MB1 and the starting time of the second oil pump MB2 is greater than or equal to a preset threshold value, the time constant value of the second time delay relay KT4 is judged to be qualified; on the contrary, if the difference between the starting time of the first oil pump MB1 and the starting time of the second oil pump MB2 is smaller than the preset threshold value, the time fixed value of the second time delay relay KT4 is determined to be unqualified.
3. The method for testing the starting time fixed value of the internal oil pump of the transformer according to claim 2, wherein the method further comprises the following steps:
and after the time constant value of the second time delay relay KT4 is judged to be unqualified, accumulating and adjusting the time constant value of the second time 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 greater than or equal to the preset threshold value.
4. The method for testing the starting time constant value of the oil pump in the transformer as claimed in claim 3, wherein when the time constant value of the second time delay relay KT4 is qualified, the time constant value of the second time delay relay KT4 is greater than or equal to 30S; and when the time constant value of the second time delay relay KT4 is unqualified, the time constant value of the second time delay relay KT4 is less than 30S.
5. The method for testing the starting time fixed value 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 in a short circuit mode.
6. A constant value test system for starting time of an oil pump in a transformer is used for comprising oil pump starting control loops connected with two oil pumps in the transformer;
the oil pump starting control loop comprises an oil temperature sensing excitation circuit formed by connecting a normally open contact of a transformer oil temperature sensor PWI and a first intermediate relay K4 in series, a load sensing excitation circuit formed by connecting a normally open contact of a load sensing relay KC, a first time delay relay KT and a second intermediate relay K04 in series, a first manual valve SK1, a second time delay relay KT4 and a third intermediate relay KM2, the first oil pump control circuit is formed by connecting a first normally open contact K4-1 of a first intermediate relay K4 or a first normally open contact K04-1 of a second intermediate relay K04 in series, the second oil pump control circuit is formed by connecting a second manual valve SK2, a fourth intermediate relay KM4, a second normally open contact K4-2 of a first intermediate relay K4 or a second normally open contact K04-2 of a second intermediate relay K04 in series, and a first oil pump MB1 and a second oil pump MB2 are arranged in series; the two ends of 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;
it is characterized by comprising:
the circuit detection unit is used for detecting the connection condition 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 detecting that all lines on the oil pump start control circuit are connected normally and determining that the first manual valve SK1, the second manual valve SK2, and a normally open contact of the transformer oil temperature sensor PWI or a normally open contact of the load induction relay KC are all closed;
and the time constant value qualification judging unit is used for judging the qualification of the time constant value of the second time delay relay KT4 according to the starting time of the first oil pump MB1 and the second oil pump MB 2.
7. The system for testing the starting time fixed value of the oil pump in the transformer according to claim 6, further comprising:
and the unqualified time constant value adjusting unit is used for accumulating and adjusting the time constant value of the second time delay relay KT4 by a fixed value after the time constant value of the second time delay relay KT4 is judged to be unqualified until the difference between the starting time of the first oil pump MB1 and the starting time of the second oil pump MB2 is greater than or equal to a preset threshold value.
8. The system for testing the starting time constant value of the oil pump in the transformer as claimed in claim 7, wherein when the time constant value of the second delay relay KT4 is qualified, the time constant value of the second delay relay KT4 is greater than or equal to 30S; and when the time constant value of the second time delay relay KT4 is unqualified, the time constant value of the second time delay relay KT4 is less than 30S.
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| CN113296555A (en) * | 2021-05-26 | 2021-08-24 | 广东电网有限责任公司 | Method and device for operating oil pressure quick-acting relay for digital transformer |
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