CN115980458B - Method, device, system, equipment and medium for detecting capacity of capacitor in transformer area - Google Patents
Method, device, system, equipment and medium for detecting capacity of capacitor in transformer area Download PDFInfo
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- CN115980458B CN115980458B CN202310272355.5A CN202310272355A CN115980458B CN 115980458 B CN115980458 B CN 115980458B CN 202310272355 A CN202310272355 A CN 202310272355A CN 115980458 B CN115980458 B CN 115980458B
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Abstract
The application discloses a method, a device, a system, equipment and a medium for detecting the capacity of a district capacitor, wherein the system comprises the following components: the device comprises a main control unit, a man-machine interaction unit, a communication unit, a sampling unit and an operation unit; the sampling unit is connected with each phase of current transformer and voltage transformer at the low-voltage side of the target platform area; the operation unit is connected with the plurality of capacitors of the target area; the main control unit is connected with the sampling unit, the operation unit, the man-machine interaction unit and the communication unit. The application is suitable for the transformer area taking the capacitor as the main reactive compensation device, can realize the periodic detection of the capacitor, can confirm the loss condition in time, and can obtain the switching capacity and the phase sequence of the unknown capacitor.
Description
Technical Field
The application relates to a method, a device, a system, equipment and a medium for detecting the capacity of a district capacitor, and belongs to the technical field of district capacitor detection.
Background
Along with the construction of a novel power system, the quantity of various distributed power sources and novel loads connected into a power grid is gradually increased, so that the demand of a transformer area on the capacitor delivery quantity is changed from a traditional fixed value to a change value which fluctuates with time. To meet this variation, the district capacitors need to meet the reactive compensation capacity requirements for accurate switching.
At present, after a part of capacitors are installed, the phenomena that the actual switching phase sequence of the capacitors is not in accordance with the switching phase sequence of the capacitors displayed on the system, the compensation capacity of the capacitors is not compensated, and the phase sequence is uploaded to the system possibly exist, so that the capacitors cannot be accurately operated according to reactive compensation requirements; after the capacitor runs for a period of time, certain loss is necessarily generated, so that certain difference exists between the actual switching capacity of the capacitor and the switching capacity of the capacitor displayed on the system, the actual compensation effect of the capacitor is further affected, and even voltage out-of-limit conditions are caused when the capacitor is serious. Therefore, the importance of realizing periodic detection of the actual switching capacity and the phase sequence of the capacitor is gradually improved.
Disclosure of Invention
In view of the above, the present application provides a method, apparatus, system, computer device and storage medium for detecting capacitor capacity in a transformer area, which can detect the actual switching capacity and phase sequence of a capacitor during the operation of the capacitor, so as to detect the loss of the capacitor and update the operation data of the capacitor in time.
A first object of the present application is to provide a method for detecting capacity of a capacitor in a cell.
A second object of the present application is to provide a district capacitor capacity detecting device.
A third object of the present application is to provide a district capacitor capacity detecting system.
A fourth object of the present application is to provide a computer device.
A fifth object of the present application is to provide a storage medium.
The first object of the present application can be achieved by adopting the following technical scheme:
a method of detecting a capacity of a district capacitor, the method comprising:
acquiring preset switching capacity of a plurality of capacitors in a target area in three phases;
detecting the actual switching capacity of a plurality of capacitors in three phases after operation;
if the preset switching capacity of the capacitor does not exist, third early warning information is sent out, and a new preset switching capacity is set for the capacitor;
if the preset switching capacity of the capacitor exists, calculating the effective rate of the capacitor according to the actual switching capacity and the preset switching capacity of the capacitor;
detecting whether the state of the capacitor is in a decaying state according to the effective rate and the threshold value thereof;
if the state of the capacitor is in an attenuation state, sending out fourth early warning information and suspending the capacitor;
until the states of a plurality of the capacitors are detected, thereby completing the current round of operation.
Preferably, said detecting the actual switching capacity of a plurality of said capacitors at three phases after commissioning comprises:
commissioning the first capacitor;
calculating the reactive power difference value of each phase of low voltage of the target transformer area before and after switching of the first capacitor;
in the process of comparing reactive power difference values of each phase with error values before and after switching to obtain a plurality of comparison results, obtaining actual switching capacity of a first capacitor by using a detection rule, wherein the detection rule comprises:
if the comparison result is that the reactive power difference value of the current phase is smaller than the error value, taking the preset switching capacity of the current phase as the actual switching capacity of the current phase;
if the comparison result shows that the reactive power difference value of the current phase is larger than the error value, the reactive power difference value of the current phase is used as the actual switching capacity of the current phase;
the first capacitor is taken out of operation;
and (3) operating the second capacitor, returning to the operation of calculating the reactive power difference value of each phase of the low voltage of the target transformer area before and after switching of the second capacitor, and executing subsequent operation until the actual switching capacity of a plurality of capacitors is detected.
Preferably, the calculating the effective rate of the capacitor according to the actual switching capacity and the preset switching capacity of the capacitor includes:
acquiring the actual switching capacity and the preset switching capacity of the capacitor in the actual switching phase sequence;
in the same phase, the effective rate of the capacitor is obtained according to the ratio of the actual switching capacity to the preset switching capacity.
Preferably, the plurality of comparison results are three-phase comparison results;
the method further comprises the steps of: and detecting the actual switching phase sequence of the capacitor according to the three-phase comparison result.
Preferably, the detecting the actual switching phase sequence of the capacitor according to the three-phase comparison result includes:
if the reactive power difference value of only one phase is larger than the error value, judging that the actual switching phase sequence of the capacitor is the phase;
and if the three-phase reactive power difference values are all larger than the error value, judging that the actual switching phase sequence of the capacitor is three-phase.
Preferably, after the detecting the actual switching phase sequence of the capacitor according to the three-phase comparison result, the method further comprises:
if the preset switching phase sequence of the capacitor does not exist, sending out first early warning information and taking the actual switching phase sequence of the capacitor as the preset switching phase sequence of the capacitor in the next-round phase sequence detection;
if the preset switching phase sequence of the capacitor exists, judging whether the actual switching phase sequence of the capacitor is consistent with the preset switching phase sequence, and outputting a judging result;
if the judgment result is inconsistent, sending out second early warning information, replacing the preset switching phase sequence of the capacitor with the actual switching phase sequence of the capacitor, and marking the capacitor.
The second object of the application can be achieved by adopting the following technical scheme:
a district capacitor capacity detection apparatus, the apparatus comprising:
the acquisition module is used for acquiring preset switching capacity of the plurality of capacitors in the three phases of the target station area;
the second detection module is used for detecting the actual switching capacity of the capacitors in three phases after the capacitors are put into operation;
the first early warning and setting module is used for sending out third early warning information and setting a new preset switching capacity for the capacitor if the capacitor does not have the preset switching capacity;
the second calculation module is used for calculating the effective rate of the capacitor according to the actual switching capacity and the preset switching capacity of the capacitor if the preset switching capacity of the capacitor exists;
the third detection module is used for detecting whether the state of the capacitor is in a decaying state according to the effective rate and the threshold value of the effective rate;
the second early warning and suspending module is used for sending out fourth early warning information and suspending the capacitor if the state of the capacitor is in an attenuation state;
until the states of a plurality of the capacitors are detected, thereby completing the current round of module operation.
The third object of the present application can be achieved by adopting the following technical scheme:
a system for detecting capacity of a capacitor in a transformer area comprises a main control unit, a man-machine interaction unit, a communication unit, a sampling unit and an operation unit;
the sampling unit is connected with each phase of current transformer and voltage transformer at the low-voltage side of the target platform area;
the operation unit is connected with the plurality of capacitors of the target area;
the main control unit is connected with the sampling unit, the operation unit, the man-machine interaction unit and the communication unit;
an operation unit for controlling switching of the capacitor;
and the main control unit is used for realizing the method for detecting the capacity of the district capacitor.
The fourth object of the present application can be achieved by adopting the following technical scheme:
the computer equipment comprises a processor and a memory for storing a program executable by the processor, wherein the processor realizes the method for detecting the capacity of the area capacitor when executing the program stored by the memory.
The fifth object of the present application can be achieved by adopting the following technical scheme:
a storage medium storing a program which, when executed by a processor, implements the above-described method of detecting a capacity of a land capacitor.
Compared with the prior art, the application has the following beneficial effects:
1. the embodiment of the application can detect the actual switching capacity and phase sequence of the capacitor in the running process of the capacitor, thereby realizing the detection of the capacitor loss and timely updating of the running data of the capacitor;
2. on the premise of ensuring safe and stable operation of a power grid, the embodiment of the application records the influence condition of each group of capacitor switching on reactive power of each phase of low voltage of a transformer area by sequentially switching on and off capacitors of the transformer area, thereby obtaining the actual switching phase sequence and the actual switching capacity of each group of capacitors, realizing the detection of the effective switching capacity and the phase sequence of the capacitors, and detecting the unknown capacitors to obtain the switching capacity and the phase sequence of the unknown capacitors;
3. the embodiment of the application is suitable for periodically checking the matching degree of the actual compensation effect and the design effect of the capacitor after the capacitor in the transformer area is installed;
4. the embodiment of the application can detect the capacitor with the switching capacity and the phase sequence recorded in the system, and write the actual switching capacity and the phase sequence of the capacitor into the system.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a block diagram of a phase sequence and capacity detection system for a capacitor in a transformer area according to embodiment 1 of the present application.
Fig. 2 is a control flow chart of the main control unit of embodiment 1 of the present application.
Fig. 3 is a flow chart of detecting the actual switching capacity of all capacitors in the area in embodiment 1 of the present application.
Fig. 4 is a flow chart showing the comparison of the preset switching phase sequence and the corresponding actual switching phase sequence of the capacitor in embodiment 1 of the present application.
Fig. 5 is a flowchart showing the calculation of the effective rate of all capacitors in the area according to embodiment 1 of the present application.
Fig. 6 is a flowchart of a phase sequence detection method of a capacitor in a transformer area according to embodiment 1 of the present application.
Fig. 7 is a flowchart of a method for detecting capacity of a capacitor in a cell according to embodiment 1 of the present application.
Fig. 8 is a block diagram of a phase sequence detector for a capacitor in a transformer area according to embodiment 2 of the present application.
Fig. 9 is a block diagram showing the configuration of a capacitor capacity detection device in a cell according to embodiment 2 of the present application.
Fig. 10 is a block diagram showing the structure of a computer device according to embodiment 3 of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments, and all other embodiments obtained by those skilled in the art without making any inventive effort based on the embodiments of the present application are within the scope of protection of the present application.
Example 1:
as shown in fig. 1, the present embodiment provides a phase sequence and capacity detection system for a capacitor in a transformer area, where the system includes a main control unit, a man-machine interaction unit, a communication unit, a sampling unit and an operation unit;
the sampling unit is connected with each phase of current transformer and voltage transformer at the low-voltage side of the target platform area;
the operation unit is connected with the plurality of capacitors of the target area;
the main control unit is connected with the sampling unit, the operation unit, the man-machine interaction unit and the communication unit;
an operation unit for controlling switching of the individual capacitors;
and the main control unit is used for realizing the control flow shown in fig. 2.
In the switching capacity and the operation capacity, the switching and the operation can be exchanged; the switching phase sequence displayed on the system and manually set/endowed by the system is a preset switching phase sequence, and the preset switching capacity is the same; the target zone may be simply referred to as "zone"; an operator performs operations such as parameter setting, data query and the like through the man-machine interaction module; communication with the master station is realized through a communication module; the sampling module obtains real-time current and voltage data through a current transformer and a voltage transformer which are arranged at each phase of the distribution transformer.
In this embodiment, the control flow is performed for a transformer area using a capacitor as a main reactive compensation device, and specifically includes:
s201, numbering all the capacitors, and setting preset switching capacity of each capacitor in A, B, C three phases and error values before and after switching.
The method specifically comprises the following steps:
s2011, setting the number of the capacitors asCIs thatC 1 To the point ofC n Capacitor numbering marki=1。
In another embodiment, the number of capacitor banks is set toCThe capacitor bank includes a plurality of capacitors, and the subsequent steps are performed in the form of a bank.
S2012, set upiPreset switching capacity of each capacitor at A, B, C three phases is respectively。
S2013, setting error values before and after switchingThe method is a manual set value, and the default value is 10% of reactive power before switching of the capacitor, and the function of the method is to eliminate the difference value of the reactive power before and after switching of the capacitor caused by system load fluctuation.
S202, switching actions are respectively carried out on each capacitor, the phase sequence and the reactive power variation quantity of the reactive power change before and after each capacitor is switched are recorded, and after all the capacitors are switched, the actual switching phase sequence and the actual switching capacity of each capacitor are detected.
Referring to fig. 3, a flow of detecting actual switching capacity of all capacitors in the area is as follows:
1. obtaining reactive power of each phase at low voltage of transformer area。
2. Operation firstC i A capacitor for obtaining reactive power of each phase at low voltage of the transformer areaAnd calculating the reactive power difference +.>、/>、/>。
3. If it is＜/>Make the firstC i The actual operating capacity of the individual capacitors in phase A is +.>And to step 5, otherwise to step 4.
4. Let the first orderC i The actual operational capacity of each capacitor in phase A is。
5. If it is＜/>Make the firstC i The actual operating capacity of the individual capacitors in phase B is +.>And to step 7, otherwise to step 6.
6. Let the first orderC i The actual operational capacity of each capacitor in phase B is。
7. If it is＜/>Make the firstC i The actual operational capacity of the individual capacitors in phase C is +.>And to step 9, otherwise to step 8.
8. Let the first orderC i The actual operational capacity of each capacitor in phase C is。
9. Let the first orderC i The individual capacitors are taken out of operation.
10. If it isi＜nStep 11, otherwise step 12.
11. Order thei=i+1, to step 1.
12. Recording the actual switching capacity of all the capacitors in the station area, and ending the flow of the round.
The process for detecting the actual switching phase sequence of the capacitor comprises the following steps:
a. if at firstC i Only the reactive power difference value of a certain phase before and after switching of the capacitors is larger than the error value, the first phase is consideredC i The capacitor only has reactive compensation effect on the certain phase, consider thatC i The capacitors are sub-compensation capacitors, and the actual switching phase sequence is the certain phase;
b. if at firstC i The three-phase reactive power difference before and after switching of each capacitor is larger than the errorThe difference is regarded as the firstC i The capacitors have reactive compensation effect on the three phases, and the third is consideredC i The capacitors are co-compensation capacitors, and the actual switching phase sequence is the three phases.
S203, if the preset switching phase sequence of the capacitors in the transformer area is arranged in the system, comparing the preset switching phase sequence with the corresponding actual switching phase sequence, if the preset switching phase sequence is consistent, not changing the preset switching phase sequence, if the preset switching phase sequence is inconsistent, notifying the system to give an alarm, marking the capacitors, and replacing the preset switching phase sequence with the corresponding actual switching phase sequence until all the capacitors in the transformer area in the system are executed, and ending the step.
Referring to fig. 4, a comparison flow of a preset switching phase sequence of a capacitor and a corresponding actual switching phase sequence is as follows:
A. if the switching phase sequence record of the capacitor in the transformer area exists in the system, the step B is carried out, otherwise, the system is informed of alarming, and the actual switching phase sequence corresponding to the capacitor is written into the system to be used as the preset switching phase sequence of the capacitor in the next phase sequence detection.
B. The preset switching phase sequence of the capacitor in the system is obtained.
C. And D, if the preset switching phase sequence of the capacitor in the system is consistent with the actual switching phase sequence corresponding to the capacitor, ending the flow of the round, otherwise, going to the step D.
D. And (3) notifying the system to alarm, marking the capacitor, replacing the preset switching phase sequence of the capacitor in the system by the actual switching phase sequence corresponding to the capacitor, and ending the flow of the round.
S204, if the preset switching capacity of the capacitor in the area is not available in the system, informing the system to alarm, writing the preset switching capacity of the set capacitor into the system, otherwise, calculating the ratio of the actual switching capacity of the capacitor to the preset switching capacity, if the ratio is smaller than the effective threshold, informing the system to alarm, marking the attenuation of the capacitor, otherwise, not processing until all the capacitors in the area in the system are executed, and ending the step.
Referring to fig. 5, the calculation flow of the effective rate of all capacitors in the area is as follows:
(0) Numbering the capacitoriSet to 1.
(1) If there is the firstiPreset switching capacity of each capacitor in three phasesStep (2), otherwise, notifying the system to alarm and setting the first stepiPreset switching capacity of individual capacitors>Writing into the system.
(2) Obtain the firstiActual switching phase sequence of individual capacitorsThe capacitor is acquired at->Actual switching capacity of the phases->And the capacitor in the system is->Preset switching capacity of phase->Calculating the effective rate of the capacitor。
(3) If the capacitor is effectiveAnd (4) if not, and (5) if not.
(4) Alarm of notification system, mark the firstiThe individual capacitors have an efficiency below the efficiency threshold and are suspended.
(5)、i＜nAnd (6) if not, ending the flow of the round.
(6) Orderi=i+1, to step (1).
As shown in fig. 6, the present embodiment further provides a phase sequence detection method of a capacitor in a transformer area, which is executed by the main control unit, and the method specifically includes the following steps:
s601, calculating the reactive power difference value of each phase of the low voltage of the target transformer area before and after switching of the capacitor.
In this step, the capacitor belongs to the target area.
S602, comparing the reactive power difference value of each phase with the error value before and after switching to obtain a three-phase comparison result.
In this step, the error value before and after switching is 10% of the reactive power before switching of the capacitor.
S603, detecting the actual switching phase sequence of the capacitor according to the three-phase comparison result.
The method specifically comprises the following steps:
s6031, if the reactive power difference value of only one phase is larger than the error value, judging that the actual switching phase sequence of the capacitor is the phase.
For example, if only the a-phase reactive power difference is greater than the error value, determining that the actual switching phase sequence of the capacitor is the a-phase; and if the B-phase reactive power difference value is larger than the error value, judging that the actual switching phase sequence of the capacitor is B-phase.
And S6032, judging that the actual switching phase sequence of the capacitor is three-phase if the three-phase reactive power difference values are all larger than the error value.
S604, if the preset switching phase sequence of the capacitor does not exist, sending out first early warning information and taking the actual switching phase sequence of the capacitor as the preset switching phase sequence of the capacitor in the next round of phase sequence detection.
S605, if the preset switching phase sequence of the capacitor exists, judging whether the actual switching phase sequence of the capacitor is consistent with the preset switching phase sequence, and outputting a judging result.
And S606, if the judgment result is inconsistent, sending out second early warning information, replacing the preset switching phase sequence of the capacitor with the actual switching phase sequence of the capacitor, and marking the capacitor.
As shown in fig. 7, the present embodiment further provides a method for detecting a capacity of a capacitor in a transformer area, which is executed by a main control unit, and specifically includes the following steps:
s701, acquiring preset switching capacity of a plurality of capacitors in a target area in three phases.
S702, detecting actual switching capacity of the capacitors in three phases after operation.
The method specifically comprises the following steps:
s7021, commissioning the first capacitor.
S7022, calculating the reactive power difference value of each phase of the low voltage of the target transformer area before and after switching of the first capacitor.
S7023, in the process of comparing reactive power difference values of each phase with error values before and after switching to obtain a plurality of comparison results, obtaining actual switching capacity of the first capacitor by using a detection rule, wherein the detection rule comprises:
if the comparison result is that the reactive power difference value of the current phase is smaller than the error value, taking the preset switching capacity of the current phase as the actual switching capacity of the current phase;
and if the comparison result shows that the reactive power difference value of the current phase is larger than the error value, taking the reactive power difference value of the current phase as the actual switching capacity of the current phase.
The error value before and after switching is 10% of the reactive power before switching of the capacitor.
S7024, the first capacitor is taken out of operation.
S7025, the second capacitor is put into operation, the operation of calculating the reactive power difference value of each phase of the low voltage of the target transformer area before and after switching of the second capacitor is returned, namely the operation corresponds to returning to S7022, and the subsequent operation is executed, namely the operation corresponds to executing S7023-S7024, until the actual switching capacity of a plurality of capacitors is detected.
It should be noted that the terms "first," "second," and the like are used for distinguishing between similar objects and not necessarily for describing a sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate, such that embodiments of the application may be practiced otherwise than as specifically illustrated and described herein, and that the "first" and "second" distinguishing between objects generally being of the same type, and not necessarily limited to the number of objects, such as the first object may be one or more.
S703, if the preset switching capacity of the capacitor does not exist, sending out third early warning information and setting a new preset switching capacity for the capacitor.
S704, if the preset switching capacity of the capacitor exists, calculating the effective rate of the capacitor according to the actual switching capacity and the preset switching capacity of the capacitor.
According to the actual switching capacity and the preset switching capacity of the capacitor, the effective rate of the capacitor is calculated, and the method specifically comprises the following steps:
s7041, acquiring the actual switching capacity and the preset switching capacity of the capacitor in the actual switching phase sequence.
S7042, in the same phase, according to the ratio of the actual switching capacity to the preset switching capacity, the effective rate of the capacitor is obtained, and the effective rate calculation flow of the capacitor in FIG. 5 can be referred to specifically.
The actual switching phase sequence can be obtained by a phase sequence detection method of the capacitor in the transformer area.
S705, detecting whether the state of the capacitor is in a decaying state according to the effective rate and the threshold value thereof.
The person skilled in the art can set the efficiency threshold according to the operating state of all capacitors of the bay, this step setting it to 70%.
S706, if the state of the capacitor is in a decaying state, sending out fourth early warning information and suspending the capacitor.
S703 to S706 are repeatedly performed until the states of a plurality of the capacitors are detected to be completed, thereby completing the current round of operation.
In practical application, the early warning information is received by the early warning device, so that the early warning device triggers early warning, the early warning form can be sound and/or light, and the early warning device can comprise a caller, a flashing lamp or an audible and visual alarm; the preset data is stored by a database in the system; the labeling condition of the capacitor is displayed by the man-machine interaction unit or uploaded to the terminal equipment through the communication unit, and is displayed by the terminal equipment.
As an example of a certain area:
a capacitor bank recorded in the system for a zone includes 2 10kVar capacitors, 3 20kVar capacitors, wherein: the capacitor No. 1 acts on the phase A, and the capacity is 10kVar; the capacitor No. 2 acts on the phase A, and the capacity is 20kVar; the capacitor 3 acts on the phase B, and the capacity is 10kVar; the capacitor No. 4 acts on the phase B, and the capacity is 20kVar; the capacitor No. 5 acts on A, B, C three phases and has a capacity of 10kVar.
The actual operational capacity and phase sequence of the capacitor bank of the transformer area are periodically detected.
On the premise of ensuring safe and stable operation of the power grid, each capacitor is sequentially switched according to the serial number sequence of the capacitors, and the result is as follows:
the difference value of the reactive power of the phase A before and after switching of the capacitor No. 1 is 8kVar, and the difference value of the reactive power of the phase B and the phase C is within the error range; before and after switching of the No. 2 capacitor, the reactive power difference value of the B phase is 13kVar, and the reactive power difference value of the A phase and the C phase is within an error range; before and after switching of the capacitor 3, the reactive power difference of the phase B is 10kVar, and the reactive power difference of the phase A and the phase C is within an error range; before and after switching of the No. 4 capacitor, the reactive power difference value of the B phase is 20kVar, and the reactive power difference value of the A phase and the C phase is within an error range; the difference value of reactive power of A phase is 8kVar, the difference value of reactive power of B phase is 8kVar, and the difference value of reactive power of C phase is 9kVar before and after switching of the No. 5 capacitor.
The comparison shows that the capacitor No. 1 is a sub-compensation capacitor, and the switching phase sequences are consistent; the capacitor No. 2 is a division compensation capacitor, and the switching phase sequence is inconsistent; the capacitor No. 3 is a division compensation capacitor, and the switching phase sequence is consistent; the capacitor No. 4 is a division compensation capacitor, and the switching phase sequence is consistent; the capacitor No. 5 is a co-compensation capacitor, and the switching phase sequence is consistent. Therefore, the system alarms, marks that the switching phase sequence of the No. 2 capacitor is inconsistent, and changes the switching phase sequence of the No. 2 capacitor in the system into the B phase.
The calculation shows that the effective rate of the No. 1 capacitor is 80%, the effective rate of the No. 2 capacitor is 65%, the effective rate of the No. 3 capacitor is 100%, the effective rate of the No. 4 capacitor is 100%, and the effective rates of the No. 5 capacitor are 80% of the A phase, 80% of the B phase and 90% of the C phase respectively. Therefore, the system alarms, marks that the effective rate of the capacitor No. 2 is lower than 70%, and hangs the capacitor No. 2.
Those skilled in the art will appreciate that all or part of the steps in a method implementing the above embodiments may be implemented by a program to instruct related hardware, and the corresponding program may be stored in a computer readable storage medium.
It should be noted that although the method operations of the above embodiments are depicted in the drawings in a particular order, this does not require or imply that the operations must be performed in that particular order or that all illustrated operations be performed in order to achieve desirable results. Rather, the depicted steps may change the order of execution. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step to perform, and/or one step decomposed into multiple steps to perform.
Example 2:
as shown in fig. 8, the present embodiment provides a phase sequence detection device for a capacitor in a transformer area, where the device includes a first calculation module 801, a comparison module 802, and a first detection module 803, and specific functions of the modules are as follows:
the first calculation module 801 is configured to calculate a low-voltage reactive power difference value of each phase in the target transformer area before and after switching of the capacitor;
the comparison module 802 is configured to compare the reactive power difference value of each phase with the error value before and after switching to obtain a three-phase comparison result;
the first detection module 803 is configured to detect an actual switching phase sequence of the capacitor according to the three-phase comparison result.
As shown in fig. 9, the present embodiment further provides a device for detecting capacity of a capacitor in a transformer area, where the device includes an acquisition module 901, a second detection module 902, a first early warning and setting module 903, a second calculation module 904, a third detection module 905, and a second early warning and suspending module 906, and specific functions of the modules are as follows:
the acquisition module 901 is used for acquiring preset switching capacity of a plurality of capacitors in the three phases of the target area;
a second detection module 902, configured to detect actual switching capacities of the plurality of capacitors in three phases after commissioning;
the first early warning and setting module 903 is configured to send out third early warning information and set a new preset switching capacity for the capacitor if there is no preset switching capacity of the capacitor;
a second calculation module 904, configured to calculate an effective rate of the capacitor according to an actual switching capacity and a preset switching capacity of the capacitor if the preset switching capacity of the capacitor exists;
a third detection module 905, configured to detect whether the state of the capacitor is in a decaying state according to the effective rate and the threshold value thereof;
a second early warning and suspending module 906, configured to send out fourth early warning information and suspend the capacitor if the state of the capacitor is in a decaying state;
until the states of a plurality of the capacitors are detected, thereby completing the current round of module operation.
Example 3:
as shown in fig. 10, the present embodiment provides a computer apparatus including a processor 1002, a memory, an input device 1003, a display device 1004, and a network interface 1005 connected by a system bus 1001. The processor 1002 is configured to provide computing and control capabilities, where the memory includes a nonvolatile storage medium 1006 and an internal memory 1007, where the nonvolatile storage medium 1006 stores an operating system, a computer program, and a database, and the internal memory 1007 provides an environment for the operating system in the nonvolatile storage medium 1006 and the running of the computer program, and when the computer program is executed by the processor 1002, the foregoing method for detecting a phase sequence of a district capacitor and/or a method for detecting a capacity of a district capacitor according to embodiment 1 is implemented as follows:
the method for detecting the phase sequence of the capacitor in the transformer area comprises the following steps:
calculating the reactive power difference value of each phase of low voltage of the target transformer area before and after switching of the capacitor;
comparing the reactive power difference value of each phase with the error value before and after switching to obtain a three-phase comparison result;
and detecting the actual switching phase sequence of the capacitor according to the three-phase comparison result.
A method for detecting capacity of a capacitor in a cell, the method comprising:
acquiring preset switching capacity of a plurality of capacitors in a target area in three phases;
detecting the actual switching capacity of a plurality of capacitors in three phases after operation;
if the preset switching capacity of the capacitor does not exist, third early warning information is sent out, and a new preset switching capacity is set for the capacitor;
if the preset switching capacity of the capacitor exists, calculating the effective rate of the capacitor according to the actual switching capacity and the preset switching capacity of the capacitor;
detecting whether the state of the capacitor is in a decaying state according to the effective rate and the threshold value thereof;
if the state of the capacitor is in an attenuation state, sending out fourth early warning information and suspending the capacitor;
until the states of a plurality of the capacitors are detected, thereby completing the current round of operation.
Example 4:
the present embodiment provides a storage medium, which is a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described phase sequence detection method for a district capacitor and/or the detection method for a district capacitor capacity of embodiment 1, as follows:
the method for detecting the phase sequence of the capacitor in the transformer area comprises the following steps:
calculating the reactive power difference value of each phase of low voltage of the target transformer area before and after switching of the capacitor;
comparing the reactive power difference value of each phase with the error value before and after switching to obtain a three-phase comparison result;
and detecting the actual switching phase sequence of the capacitor according to the three-phase comparison result.
A method for detecting capacity of a capacitor in a cell, the method comprising:
acquiring preset switching capacity of a plurality of capacitors in a target area in three phases;
detecting the actual switching capacity of a plurality of capacitors in three phases after operation;
if the preset switching capacity of the capacitor does not exist, third early warning information is sent out, and a new preset switching capacity is set for the capacitor;
if the preset switching capacity of the capacitor exists, calculating the effective rate of the capacitor according to the actual switching capacity and the preset switching capacity of the capacitor;
detecting whether the state of the capacitor is in a decaying state according to the effective rate and the threshold value thereof;
if the state of the capacitor is in an attenuation state, sending out fourth early warning information and suspending the capacitor;
until the states of a plurality of the capacitors are detected, thereby completing the current round of operation.
The computer readable storage medium of the present embodiment may be a computer readable signal medium or a computer readable storage medium, or any combination of the two. The computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above. More specific examples of the computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
In this embodiment, a computer-readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. In the present embodiment, however, the computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, with a computer-readable program embodied therein. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the preceding. A computer readable signal medium may also be any computer readable storage medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. A computer program embodied on a computer readable storage medium may be transmitted using any appropriate medium, including but not limited to: electrical wires, fiber optic cables, RF (radio frequency), etc., or any suitable combination thereof.
The computer readable storage medium may be written in one or more programming languages, including an object oriented programming language such as Java, python, C ++ and conventional procedural programming languages, such as the C-language or similar programming languages, for performing the present embodiments. The program may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider).
In summary, the embodiment of the application can detect the actual switching capacity and phase sequence of the capacitor in the running process of the capacitor, thereby realizing the detection of the capacitor loss and timely updating of the running data of the capacitor.
The above-mentioned embodiments are only preferred embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can make equivalent substitutions or modifications according to the technical solution and the inventive concept of the present application within the scope of the present application disclosed in the present application patent, and all those skilled in the art belong to the protection scope of the present application.
Claims (5)
1. A method for detecting capacity of a capacitor in a transformer area, the method comprising:
acquiring preset switching capacity of a plurality of capacitors in a target area in three phases;
detecting the actual switching capacity of a plurality of capacitors in three phases after operation;
if the preset switching capacity of the capacitor does not exist, third early warning information is sent out, and a new preset switching capacity is set for the capacitor;
if the preset switching capacity of the capacitor exists, calculating the effective rate of the capacitor according to the actual switching capacity and the preset switching capacity of the capacitor;
detecting whether the state of the capacitor is in a decaying state according to the effective rate and the threshold value thereof;
if the state of the capacitor is in an attenuation state, sending out fourth early warning information and suspending the capacitor;
until the states of a plurality of the capacitors are detected to be completed, thereby completing the current round operation;
the detecting of the actual switching capacity of the plurality of capacitors in three phases after operation comprises:
commissioning the first capacitor;
calculating the reactive power difference value of each phase of low voltage of the target transformer area before and after switching of the first capacitor;
in the process of comparing reactive power difference values of each phase with error values before and after switching to obtain a plurality of comparison results, obtaining actual switching capacity of a first capacitor by using a detection rule, wherein the detection rule comprises:
if the comparison result is that the reactive power difference value of the current phase is smaller than the error value, taking the preset switching capacity of the current phase as the actual switching capacity of the current phase;
if the comparison result shows that the reactive power difference value of the current phase is larger than the error value, the reactive power difference value of the current phase is used as the actual switching capacity of the current phase;
the first capacitor is taken out of operation;
the second capacitor is put into operation, the operation of calculating the reactive power difference value of each phase of the low voltage of the target transformer area before and after the switching of the second capacitor is returned, and the subsequent operation is executed until the actual switching capacity of a plurality of capacitors is detected;
the plurality of comparison results are three-phase comparison results;
detecting an actual switching phase sequence of the capacitor according to the three-phase comparison result, including:
if the reactive power difference value of only one phase is larger than the error value, judging that the actual switching phase sequence of the capacitor is the phase;
if the three-phase reactive power difference values are all larger than the error value, judging that the actual switching phase sequence of the capacitor is three-phase;
the calculating the effective rate of the capacitor according to the actual switching capacity and the preset switching capacity of the capacitor comprises the following steps:
acquiring the actual switching capacity and the preset switching capacity of the capacitor in the actual switching phase sequence;
in the same phase, obtaining the effective rate of the capacitor according to the ratio of the actual switching capacity and the corresponding preset switching capacity in the actual switching phase sequence;
after the actual switching phase sequence of the capacitor is detected according to the three-phase comparison result, the method further comprises the following steps:
if the preset switching phase sequence of the capacitor does not exist, sending out first early warning information and taking the actual switching phase sequence of the capacitor as the preset switching phase sequence of the capacitor in the next-round phase sequence detection;
if the preset switching phase sequence of the capacitor exists, judging whether the actual switching phase sequence of the capacitor is consistent with the preset switching phase sequence, and outputting a judging result;
if the judgment result is inconsistent, sending out second early warning information, replacing the preset switching phase sequence of the capacitor with the actual switching phase sequence of the capacitor, and marking the capacitor.
2. A district capacitor capacity detection apparatus, characterized in that the apparatus comprises:
the acquisition module is used for acquiring preset switching capacity of the plurality of capacitors in the three phases of the target station area;
the second detection module is used for detecting the actual switching capacity of the capacitors in three phases after the capacitors are put into operation;
the first early warning and setting module is used for sending out third early warning information and setting a new preset switching capacity for the capacitor if the capacitor does not have the preset switching capacity;
the second calculation module is used for calculating the effective rate of the capacitor according to the actual switching capacity and the preset switching capacity of the capacitor if the preset switching capacity of the capacitor exists;
the third detection module is used for detecting whether the state of the capacitor is in a decaying state according to the effective rate and the threshold value of the effective rate;
the second early warning and suspending module is used for sending out fourth early warning information and suspending the capacitor if the state of the capacitor is in an attenuation state;
until the states of a plurality of capacitors are detected to be completed, thereby completing the current round of module operation;
the detecting of the actual switching capacity of the plurality of capacitors in three phases after operation comprises:
commissioning the first capacitor;
calculating the reactive power difference value of each phase of low voltage of the target transformer area before and after switching of the first capacitor;
in the process of comparing reactive power difference values of each phase with error values before and after switching to obtain a plurality of comparison results, obtaining actual switching capacity of a first capacitor by using a detection rule, wherein the detection rule comprises:
if the comparison result is that the reactive power difference value of the current phase is smaller than the error value, taking the preset switching capacity of the current phase as the actual switching capacity of the current phase;
if the comparison result shows that the reactive power difference value of the current phase is larger than the error value, the reactive power difference value of the current phase is used as the actual switching capacity of the current phase;
the first capacitor is taken out of operation;
the second capacitor is put into operation, the operation of calculating the reactive power difference value of each phase of the low voltage of the target transformer area before and after the switching of the second capacitor is returned, and the subsequent operation is executed until the actual switching capacity of a plurality of capacitors is detected;
the plurality of comparison results are three-phase comparison results;
detecting an actual switching phase sequence of the capacitor according to the three-phase comparison result, including:
if the reactive power difference value of only one phase is larger than the error value, judging that the actual switching phase sequence of the capacitor is the phase;
if the three-phase reactive power difference values are all larger than the error value, judging that the actual switching phase sequence of the capacitor is three-phase;
the calculating the effective rate of the capacitor according to the actual switching capacity and the preset switching capacity of the capacitor comprises the following steps:
acquiring the actual switching capacity and the preset switching capacity of the capacitor in the actual switching phase sequence;
in the same phase, obtaining the effective rate of the capacitor according to the ratio of the actual switching capacity and the corresponding preset switching capacity in the actual switching phase sequence;
after the actual switching phase sequence of the capacitor is detected according to the three-phase comparison result, the method further comprises the following steps:
if the preset switching phase sequence of the capacitor does not exist, sending out first early warning information and taking the actual switching phase sequence of the capacitor as the preset switching phase sequence of the capacitor in the next-round phase sequence detection;
if the preset switching phase sequence of the capacitor exists, judging whether the actual switching phase sequence of the capacitor is consistent with the preset switching phase sequence, and outputting a judging result;
if the judgment result is inconsistent, sending out second early warning information, replacing the preset switching phase sequence of the capacitor with the actual switching phase sequence of the capacitor, and marking the capacitor.
3. The system is characterized by comprising a main control unit, a man-machine interaction unit, a communication unit, a sampling unit and an operation unit;
the sampling unit is connected with each phase of current transformer and voltage transformer at the low-voltage side of the target platform area;
the operation unit is connected with the plurality of capacitors of the target area;
the main control unit is connected with the sampling unit, the operation unit, the man-machine interaction unit and the communication unit;
an operation unit for controlling switching of the capacitor;
a main control unit for implementing the method of claim 1.
4. A computer device comprising a processor and a memory for storing a program executable by the processor, wherein the processor implements the method of claim 1 when executing the program stored in the memory.
5. A storage medium storing a program which, when executed by a processor, implements the method of claim 1.
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