CN112540337A - Transformer substation outgoing line capacitive voltage transformer monitoring method, device and equipment - Google Patents
Transformer substation outgoing line capacitive voltage transformer monitoring method, device and equipment Download PDFInfo
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- CN112540337A CN112540337A CN202011622165.4A CN202011622165A CN112540337A CN 112540337 A CN112540337 A CN 112540337A CN 202011622165 A CN202011622165 A CN 202011622165A CN 112540337 A CN112540337 A CN 112540337A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000002159 abnormal effect Effects 0.000 claims abstract description 17
- 238000012806 monitoring device Methods 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 6
- 230000007547 defect Effects 0.000 abstract description 15
- 239000003990 capacitor Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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Abstract
The application discloses a method, a device and equipment for monitoring a transformer substation outgoing line capacitive voltage transformer, which change the monitoring mode of comparing the secondary voltage of the capacitive voltage transformer by the transformer substation in the past, simultaneously monitor the secondary voltage and the end screen current of the voltage transformer, judge that the voltage transformer is abnormal and perform abnormal alarm when the voltage variation, the phase angle difference between the end screen current break variable and the voltage current exceed the requirements of a certain range, identify the early defects of the voltage transformer by adopting three modes of voltage out-of-limit, voltage current included angle out-of-limit and current break variable out-of-limit, solve the problem that the existing transformer substation power system voltage transformer monitoring mode only monitors and alarms the deviation among the secondary voltages of a group of capacitive voltage transformers, and have more fault types and part of early defects are not obvious on the voltage variation, it is difficult to find all the technical problems of early defects in time.
Description
Technical Field
The application relates to the technical field of voltage transformer monitoring, in particular to a method, a device and equipment for monitoring a transformer substation outgoing line capacitive voltage transformer.
Background
The capacitor voltage transformer in the electric power system of the transformer substation is an important device for monitoring and protecting the electric power system, and when the secondary voltage of the capacitor voltage transformer rises or falls due to damage of a capacitor core, the protection action is abnormal, so that the voltage transformer in the electric power system needs to be monitored. However, in the current monitoring mode of the voltage transformer of the power system, only the deviation between the secondary voltages of a group of capacitor voltage transformers is monitored and alarmed, and because the voltage transformers have more fault types and the expression of part of early defects on voltage change is not obvious, all the early defects are difficult to find in time.
Disclosure of Invention
The application provides a transformer substation outgoing line capacitive voltage transformer monitoring method, a transformer substation outgoing line capacitive voltage transformer monitoring device and transformer substation outgoing line capacitive voltage transformer monitoring equipment, which are used for solving the technical problems that the existing transformer substation electric power system voltage transformer monitoring mode only monitors and alarms the mutual deviation of secondary voltages of a group of capacitive voltage transformers, and all early defects are difficult to find in time due to the fact that the voltage transformers have more fault categories and the partial early defects are not obvious in voltage change.
In view of this, the first aspect of the present application provides a method for monitoring a transformer substation outgoing line capacitive voltage transformer, including:
acquiring secondary voltage and end screen current of a voltage transformer group;
calculating a secondary current abrupt change according to the end screen current;
calculating the phase angle difference between the secondary voltage and the end screen current;
and comparing the secondary voltage, the secondary current break variable and the phase angle difference of the voltage transformer group with the secondary voltage, the secondary current break variable and the phase angle difference of the reference voltage transformer, and if the variation of the secondary voltage, the secondary current break variable and the phase angle difference exceeds a preset range, sending an abnormal alarm.
The application second aspect provides a transformer substation outgoing line capacitance type voltage transformer monitoring device, includes:
the acquisition unit is used for acquiring secondary voltage and end screen current of a voltage transformer of the voltage transformer group;
the current calculating unit is used for calculating a secondary current abrupt change according to the end screen current;
the phase angle calculation unit is used for calculating the phase angle difference between the secondary voltage and the end screen current;
and the early warning unit is used for comparing the secondary voltage, the secondary current break variable and the phase angle difference of the voltage transformers of the voltage transformer group with the secondary voltage, the secondary current break variable and the phase angle difference of the reference voltage transformer, and if the variation of the secondary voltage, the secondary current break variable and the phase angle difference exceeds a preset range, sending an abnormal warning.
The third aspect of the application provides a transformer substation outgoing line capacitance type voltage transformer monitoring device, which comprises a processor and a memory, wherein the processor is used for:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the transformer substation outgoing line capacitive voltage transformer monitoring method according to the first aspect according to instructions in the program code.
According to the technical scheme, the embodiment of the application has the following advantages:
the application provides a method for monitoring a transformer substation outgoing line capacitive voltage transformer, which comprises the following steps: acquiring secondary voltage and end screen current of a voltage transformer group; calculating a secondary current abrupt change according to the end screen current; calculating the phase angle difference between the secondary voltage and the end screen current; and comparing the secondary voltage, the secondary current break variable and the phase angle difference of the voltage transformer group with the secondary voltage, the secondary current break variable and the phase angle difference of the reference voltage transformer, and if the variation of the secondary voltage, the secondary current break variable and the phase angle difference exceeds a preset range, sending an abnormal alarm.
The transformer substation outgoing line capacitor voltage transformer monitoring method changes the previous transformer substation secondary voltage comparison mode monitoring mode, simultaneously monitors the secondary voltage and the end screen current of the voltage transformer, when the voltage variation, the phase angle difference between the end screen current abrupt change and the voltage current exceed a certain range requirement, the voltage transformer is considered to be abnormal and abnormal alarm is carried out, the early defects of the voltage transformer are identified by adopting three modes of voltage out-of-limit, voltage current included angle out-of-limit and current abrupt change out-of-limit, the problem that the existing transformer substation power system voltage transformer monitoring mode only monitors and alarms the mutual deviation of the secondary voltages of a group of capacitor voltage transformers is solved, because the voltage transformers have more fault types, and the partial early defects are not obvious in voltage variation, it is difficult to find all the technical problems of early defects in time.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other related drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a method for monitoring a transformer substation outgoing line capacitive voltage transformer provided in an embodiment of the present application;
fig. 2 is a schematic structural diagram of a substation outgoing line capacitive voltage transformer monitoring device provided in an embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Example 1
For easy understanding, please refer to fig. 1, an embodiment of a substation outgoing line capacitive voltage transformer monitoring method provided by the present application includes:
step 101, obtaining secondary voltage and end screen current of a voltage transformer group.
It should be noted that, first, the secondary voltage of each outgoing line voltage transformer of the substation and the current passing through the end screen outgoing line need to be acquired.
And 102, calculating a secondary current abrupt change amount by using the end screen current.
It should be noted that, after the end-screen current is obtained, the secondary current abrupt change of the end-screen current is calculated.
And 103, calculating the phase angle difference between the secondary voltage and the end screen current.
It should be noted that, the phase angle difference between the voltage and the current is calculated according to the secondary voltage and the end screen current, so as to obtain the variation of the included angle between the secondary voltage and the end screen current.
And 104, comparing the secondary voltage, the secondary current break variable and the phase angle difference of the voltage transformers of the voltage transformer group with the secondary voltage, the secondary current break variable and the phase angle difference of the reference voltage transformer, and if the variation of the secondary voltage, the secondary current break variable and the phase angle difference exceeds a preset range, sending an abnormal alarm.
It should be noted that in the embodiment of the present application, three ways, namely, voltage out-of-limit, angle out-of-limit, and current abrupt change amount out-of-limit, are adopted to simultaneously identify early defects, the secondary voltage, the secondary current abrupt change amount, and the phase angle difference of the voltage transformer set are compared with the secondary voltage, the secondary current abrupt change amount, and the phase angle difference of the reference voltage transformer, and if the variation amounts of the secondary voltage, the secondary current abrupt change amount, and the phase angle difference exceed the preset range, an abnormal alarm is issued.
The method for monitoring the outgoing line capacitive voltage transformer of the transformer substation provided by the embodiment of the application changes the previous monitoring mode of comparing the secondary voltage of the capacitive voltage transformer by the transformer substation, simultaneously monitors the secondary voltage and the end screen current of the voltage transformer, judges that the voltage transformer is abnormal and gives an abnormal alarm when the voltage variation, the phase angle difference between the end screen current sudden change and the voltage current exceed the requirements of a certain range, and identifies the early defects of the voltage transformer by adopting three modes of voltage out-of-limit, voltage current included angle out-of-limit and current sudden change out-of-limit, thereby solving the problem that the existing monitoring mode of the voltage transformer of the transformer substation power system only monitors and alarms the mutual deviation of the secondary voltages of a group of the capacitive voltage transformers, and the performance of partial early defects on the voltage variation is not obvious due to more fault types of the voltage transformers, it is difficult to find all the technical problems of early defects in time.
Example 2
For ease of understanding, referring to fig. 2, an embodiment of a substation outgoing line capacitive voltage transformer monitoring device is provided herein, including:
the acquisition unit is used for acquiring secondary voltage and end screen current of a voltage transformer of the voltage transformer group;
the current calculating unit is used for calculating a secondary current abrupt change according to the end screen current;
the phase angle calculation unit is used for calculating the phase angle difference between the secondary voltage and the end screen current;
and the early warning unit is used for comparing the secondary voltage, the secondary current break variable and the phase angle difference of the voltage transformers of the voltage transformer group with the secondary voltage, the secondary current break variable and the phase angle difference of the reference voltage transformer, and if the variation of the secondary voltage, the secondary current break variable and the phase angle difference exceeds a preset range, sending an abnormal warning.
It should be noted that, first, the secondary voltage of each outgoing line voltage transformer of the substation and the current passing through the end screen outgoing line are obtained through the obtaining unit. After obtaining the end screen current, the current calculation unit calculates a secondary current abrupt change amount of the end screen current. The phase angle calculation unit calculates the phase angle difference between the secondary voltage and the end screen current, and calculates the phase angle difference between the voltage and the current according to the secondary voltage and the end screen current to obtain the included angle variation of the secondary voltage and the end screen current. The early warning unit simultaneously identifies early defects by adopting three modes of voltage out-of-limit, angle out-of-limit and current abrupt change out-of-limit, compares the secondary voltage, the secondary current abrupt change and the phase angle difference of a voltage transformer of the voltage transformer group with the secondary voltage, the secondary current abrupt change and the phase angle difference of a reference voltage transformer, and sends an abnormal warning if the variation of the secondary voltage, the secondary current abrupt change and the phase angle difference exceeds a preset range.
The transformer substation outgoing line capacitance type voltage transformer monitoring device provided by the embodiment of the application monitors the secondary voltage of a capacitor bus transformer and the secondary current of a capacitor current transformer in real time, corrects the secondary voltage by adopting a transient overvoltage back-calculation method of an electromagnetic voltage transformer, improves the accuracy of harmonic measurement and judgment, calculates the harmonic component of the corrected voltage and the secondary current in real time, gives out early warning in time when the harmonic component exceeds an allowable range, provides a judgment basis for the input and exit of reactive equipment in time, ensures the safe operation of a power distribution network, solves the problems that the existing power distribution network capacitor bank cannot introduce harmonic monitoring in the operation state monitoring, cannot quit reactive compensation in time when the harmonic component exceeds the allowable range, and causes equipment to continue to operate under abnormal conditions until the equipment is damaged and a circuit breaker trips, the technical problem of threat to the safe operation of the power distribution network.
Example 3
The application provides an embodiment of transformer substation outgoing line capacitance type voltage transformer monitoring equipment, and the equipment comprises a processor and a memory:
the memory is used for storing the program codes and transmitting the program codes to the processor;
the processor is used for executing the substation outgoing line capacitive voltage transformer monitoring method in embodiment 1 according to the instructions in the program codes
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (3)
1. A transformer substation outgoing line capacitance type voltage transformer monitoring method is characterized by comprising the following steps:
acquiring secondary voltage and end screen current of a voltage transformer group;
calculating a secondary current abrupt change according to the end screen current;
calculating the phase angle difference between the secondary voltage and the end screen current;
and comparing the secondary voltage, the secondary current break variable and the phase angle difference of the voltage transformer group with the secondary voltage, the secondary current break variable and the phase angle difference of the reference voltage transformer, and if the variation of the secondary voltage, the secondary current break variable and the phase angle difference exceeds a preset range, sending an abnormal alarm.
2. The utility model provides a transformer substation is qualified for next round of competitions capacitive voltage transformer monitoring devices which characterized in that includes:
the acquisition unit is used for acquiring secondary voltage and end screen current of a voltage transformer of the voltage transformer group;
the current calculating unit is used for calculating a secondary current abrupt change according to the end screen current;
the phase angle calculation unit is used for calculating the phase angle difference between the secondary voltage and the end screen current;
and the early warning unit is used for comparing the secondary voltage, the secondary current break variable and the phase angle difference of the voltage transformers of the voltage transformer group with the secondary voltage, the secondary current break variable and the phase angle difference of the reference voltage transformer, and if the variation of the secondary voltage, the secondary current break variable and the phase angle difference exceeds a preset range, sending an abnormal warning.
3. The utility model provides a transformer substation outgoing line capacitance voltage transformer monitoring facilities which characterized in that, equipment includes treater and memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the substation outlet capacitive voltage transformer monitoring method of claim 1 according to instructions in the program code.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011622165.4A CN112540337A (en) | 2020-12-30 | 2020-12-30 | Transformer substation outgoing line capacitive voltage transformer monitoring method, device and equipment |
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| CN202011622165.4A CN112540337A (en) | 2020-12-30 | 2020-12-30 | Transformer substation outgoing line capacitive voltage transformer monitoring method, device and equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114113944A (en) * | 2021-11-25 | 2022-03-01 | 广东电网有限责任公司 | CVT capacitor unit breakdown defect test method and device |
| CN117368621A (en) * | 2023-12-06 | 2024-01-09 | 南方电网科学研究院有限责任公司 | Casing state monitoring method and device, storage medium and computer equipment |
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| CN117368621A (en) * | 2023-12-06 | 2024-01-09 | 南方电网科学研究院有限责任公司 | Casing state monitoring method and device, storage medium and computer equipment |
| CN117368621B (en) * | 2023-12-06 | 2024-02-23 | 南方电网科学研究院有限责任公司 | Casing state monitoring method and device, storage medium and computer equipment |
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