CN116365489B - Electronic tripping action control method for measuring switch - Google Patents
Electronic tripping action control method for measuring switch Download PDFInfo
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- CN116365489B CN116365489B CN202310266017.0A CN202310266017A CN116365489B CN 116365489 B CN116365489 B CN 116365489B CN 202310266017 A CN202310266017 A CN 202310266017A CN 116365489 B CN116365489 B CN 116365489B
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000009471 action Effects 0.000 title claims abstract description 18
- 230000000737 periodic effect Effects 0.000 claims abstract description 37
- 230000008859 change Effects 0.000 claims abstract description 35
- 238000005070 sampling Methods 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 6
- 238000005259 measurement Methods 0.000 abstract description 5
- 239000000284 extract Substances 0.000 abstract description 3
- 230000005856 abnormality Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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- 230000001052 transient effect Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/12—Measuring rate of change
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
- H02J13/0004—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers involved in a protection system
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The application discloses an electronic tripping action control method for a measuring switch, which eliminates non-periodic components from current instantaneous value information containing periodic components and non-periodic components, and extracts sine information required by short-circuit protection and automatic control correct action. And then, according to the measurement information, calculating the current change rate, comparing the current change rate with an acquired preset tripping current trigger value, if the current change rate exceeds the tripping current trigger value, considering that a short circuit occurs, sending a tripping command to generate a protection signal, and preparing the tripping protection of the measuring switch, if the current change rate does not exceed the tripping current trigger value, considering that the short circuit does not occur, and the current change rate is a normal phenomenon caused by starting current, and the short circuit tripping protection cannot generate the protection signal. The phenomenon of misjudgment of short-circuit protection of the measuring switch can be effectively avoided, and the predictive maintenance of the power system and the judgment of the power equipment faults in the later period are facilitated.
Description
Technical Field
The application relates to the technical field of power systems, in particular to an electronic tripping action control method for a measuring switch.
Background
With the continuous effort of the intelligent power grid in China, the automation and the data analysis are paid great attention to. The measuring switch is an intelligent controller for energy information flow and business flow, directly relates to safety, intelligence and economic electricity utilization of vast power users, and has important social and economic values. The measuring switch is one of the most important components in the electric link, is used for realizing the functions of normal connection and segmentation of the matched circuit, overload protection, short-circuit protection and the like, and can realize the local or remote interaction of measuring data.
It is known that in local grids with powerful electric drives, as consumers, when using short-circuit current protection, the devices have to react to short-circuit phenomena in a very short time and no false alarms occur. False alarms are due to the fact that the starting current level of some electrical devices is large and equal to the current at which tripping occurs when the protection signal is triggered. The importance of the electrical device start-up problem depends on the power at the point of network shorting at the device connection point, i.e. the fault current level from a given point. The greater the short-circuit current, the more "robust" the network and the less negative the electrical device has to have on it. Tuning is performed by selecting a trip current of the trip unit that exceeds a peak current at startup of the electrical device. The start-up current and the short-circuit current in the power grid can be identified more flexibly at an early stage. Thus, the grid becomes safer, thereby improving its reliability.
However, when the tripping action of the measuring switch is judged at present, the error judgment probability is still high, so that the later execution of predictive maintenance on the power system and the judgment on the power equipment faults are affected, and therefore, the electronic tripping action protection method of the measuring switch is researched.
Disclosure of Invention
The application provides an electronic tripping action control method for a measuring switch, which solves the problems that in the prior art, when the tripping action of the measuring switch is judged, the misjudgment probability is high, and further the later execution predictive maintenance on a power system and the fault judgment on power equipment are affected.
In order to solve the above technical problems, the present application provides an electronic trip action control method for a measuring switch, including:
acquiring an original current value and a corresponding angular frequency measured by a measuring switch and a preset tripping current trigger value;
calculating an instantaneous current value of the current with obviously reduced aperiodicity according to the angular frequency, and calculating aperiodic components at two adjacent moments according to the instantaneous current value and the original current value;
calculating a time constant based on an instantaneous current value and the original current value at the same time as the non-periodic component, and calculating a current phase based on the time constant and the angular frequency;
Calculating a steady state value of the current according to the angular frequency, the time constant and the current phase;
Calculating an aperiodic component based on the time constant, the current phase and the steady-state value, calculating a periodic component based on the aperiodic component and the original current value, and differentiating the periodic component to obtain the change rate of the current;
judging whether the change rate is larger than the tripping current trigger value or not;
If so, determining that a short circuit occurs and controlling the tripping protection of the measuring switch, if not, determining that the short circuit does not occur and not performing the tripping protection treatment of the measuring switch, returning to the step of calculating an aperiodic component based on the time constant, the current phase and the steady state value, calculating a periodic component based on the aperiodic component and the original current value, and differentiating the periodic component to obtain the change rate of the current.
Preferably, after the obtaining the original current value measured by the measurement switch, the method further includes:
judging whether the original current value is equal to zero;
if yes, returning to the step of acquiring the original current value and the corresponding angular frequency measured by the measuring switch;
If not, the step of calculating the instantaneous current value of the non-periodically significantly reduced current in dependence of the angular frequency is entered.
Preferably, the calculating the instantaneous current value of the current with non-periodic significant reduction according to the angular frequency is specifically:
Calculating the instantaneous current value according to the three acquired sampling samples, wherein the calculation formula of the instantaneous current value i calc is as follows:
where Δt is a sampling time interval of each sample current instantaneous value, n is a sequence number of the sample current, and i sc is an original current value.
Preferably, the calculating the non-periodic components of two adjacent moments according to the instantaneous current value and the original current value is specifically:
calculating an aperiodic component adjacent to a second sampling time interval and a third sampling time interval according to the instantaneous current value and the original current value, wherein the calculation formula of the aperiodic component is as follows:
inp(3Δt)＝icalc(2Δt)-isc(3Δt)
inp(2Δt)＝icalc(Δt)-isc(2Δt)。
preferably, the time constant T N and the current phase The calculation formulas of (a) are respectively as follows:
Where ω is the angular frequency.
Preferably, the calculation formula of the steady state value is:
Preferably, the calculation formula of the aperiodic component i np is:
Correspondingly, the calculation formula of the periodic component i sin is as follows:
isin(t)＝isc(t)-inp(t)
the calculation formula of the change rate is as follows:
Preferably, after determining whether the rate of change is greater than the trip current trigger value, the method further comprises:
Judging whether the change rate is stable within a preset time range or not;
If yes, returning to the step of determining that the short circuit occurs and controlling the tripping protection of the measuring switch;
if not, returning to the step of determining that the short circuit does not occur and not performing the tripping protection treatment of the measuring switch.
Compared with the prior art, the electronic tripping action control method for the measuring switch provided by the application eliminates the non-periodic component from the current instantaneous value information containing the periodic component and the non-periodic component, and extracts sine information required by short-circuit protection and automatic control correct action. And then, according to the measurement information, calculating the current change rate, comparing the current change rate with an acquired preset tripping current trigger value, if the current change rate exceeds the tripping current trigger value, considering that a short circuit occurs, sending a tripping command to generate a protection signal, and preparing the tripping protection of the measuring switch, if the current change rate does not exceed the tripping current trigger value, considering that the short circuit does not occur, and the current change rate is a normal phenomenon caused by starting current, and the short circuit tripping protection cannot generate the protection signal. The phenomenon of misjudgment of short-circuit protection of the measuring switch can be effectively avoided, and the predictive maintenance of the power system and the judgment of the power equipment faults in the later period are facilitated.
Drawings
For a clearer description of the technical solutions of the present application, the drawings that are required to be used in the embodiments will be briefly described, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without making any effort.
Fig. 1 is a flowchart of an electronic trip control method for a measuring switch according to an embodiment of the present invention.
Detailed Description
In order to enable those skilled in the art to better understand the technical solutions of the present application, the following description will make clear and complete descriptions of the technical solutions of the embodiments of the present application with reference to the accompanying drawings.
The core of the application is to provide an electronic tripping action control method for a measuring switch, which can solve the problems of high misjudgment probability when the tripping action of the measuring switch is judged in the prior art, and further influence the later execution of predictive maintenance on a power system and the judgment of the faults of power equipment.
Fig. 1 is a flowchart of a control method for electronic tripping operation of a measuring switch according to an embodiment of the present invention, as shown in fig. 1, the control method includes the following steps:
S101: the method comprises the steps of obtaining an original current value (short-circuit current) and a corresponding angular frequency measured by a measuring switch and a preset tripping current trigger value.
The original current value I sc and the angular frequency are measured in real time, the angular frequency in this embodiment may be an average value of angular frequencies obtained at a plurality of time intervals, and the trip current trigger value' I set is preset in the system.
In actual operation, to improve the effectiveness of data acquisition, the method further comprises: s1010: judging whether the original current value i sc is equal to zero, if so, returning to the step S101: if not, the process advances to step S102.
S102: the instantaneous current value of the current with obviously reduced aperiodicity is calculated according to the angular frequency, and the aperiodic components of two adjacent moments are calculated according to the instantaneous current value and the original current value.
Preferably, the instantaneous current value is calculated according to three acquired sampling samples, and the calculation formula of the instantaneous current value i calc is as follows:
where Δt is a sampling time interval of each sample current instantaneous value, n is a sequence number of the sample current, and i sc is an original current value.
Preferably, the non-periodic components of the adjacent second sampling time interval 2Δt and the third sampling time interval 3Δt are calculated according to the instantaneous current value and the original current value, and the non-periodic components of the moments 2Δt and 3Δt can be calculated by substituting the sample values of 2Δt and 3Δt into the following formula:
The non-periodic component in the current value calculated according to equation (2) is reduced and the periodic component is not distorted. The equation may eliminate periodic components from the short-circuit current.
S103: the time constant is calculated based on the instantaneous current value and the original current value at the same time as the non-periodic component, and the current phase is calculated based on the time constant and the angular frequency.
Preferably, the time constant T N and the current phaseThe calculation formulas of (a) are respectively as follows:
Where ω is the angular frequency.
S104: and calculating a steady state value of the current according to the angular frequency, the time constant and the current phase.
The calculation formula of the steady state value is:
S105: and calculating an aperiodic component based on the time constant, the current phase and the steady-state value, calculating a periodic component based on the aperiodic component and the original current value, and differentiating the periodic component to obtain the change rate of the current.
The calculation formula of the aperiodic component i np is:
Correspondingly, the calculation formula of the periodic component i sin is:
isin(t)＝isc(t)-inp(t) (7)；
according to the obtained original current value i sc, the calculation formula of the change rate is as follows:
For the grid, the short-circuit current periodic component is the current that should suddenly increase by many times in ohm's law due to the sudden decrease of circuit impedance by many times after the short-circuit. The non-periodic component of the short-circuit current is a reverse offset and decaying exponentially generated by Lenz's law to maintain the initial transient current from abrupt change due to the presence of inductance in the short-circuit.
S106: judging whether the change rate is larger than a tripping current trigger value or not;
if yes, go to S107, if no, go to S108;
S107: determining that a short circuit occurs and controlling the measuring switch to trip for protection; s108: and determining that the short circuit does not occur and the measurement switch trip protection processing is not performed, and returning to the step of S105.
Preferably, after determining whether the rate of change is greater than the trip current trigger value, the method further comprises:
s109: judging whether the change rate is stable within a preset time range;
If yes, returning to the step S107, namely considering short circuit at the moment and starting tripping; if not, the step of S108 is returned, namely, the specified time is fallen back, and the current phenomenon is started normally. Through the judgment of the step, the accuracy of the tripping action control of the measuring switch can be further improved.
In the event of a short circuit, the current rises instantaneously, the rate of change of the periodic currentLarger, and longer duration; in the case of starting current, the rate of change of the periodic current is due to the presence of winding reactanceSmaller, and typically fall back at a given time.
System-determinedThe value is compared with the tripping current trigger value' I set in real time during the operation of the system, so that the abnormality of the current can be accurately distinguished, and the situation of misjudgment caused by the influence of the starting current is avoided. When (when)The system will issue a trip command.
The application provides an electronic tripping action control method for a measuring switch, which eliminates non-periodic components from current instantaneous value information containing periodic components and non-periodic components, and extracts sine information required by short-circuit protection and automatic control correct action. And then, according to the measurement information, calculating the current change rate, comparing the current change rate with an acquired preset tripping current trigger value, if the current change rate exceeds the tripping current trigger value, considering that a short circuit occurs, sending a tripping command to generate a protection signal, and preparing the tripping protection of the measuring switch, if the current change rate does not exceed the tripping current trigger value, considering that the short circuit does not occur, and the current change rate is a normal phenomenon caused by starting current, and the short circuit tripping protection cannot generate the protection signal. The phenomenon of misjudgment of short-circuit protection of the measuring switch can be effectively avoided, and the predictive maintenance of the power system and the judgment of the power equipment faults in the later period are facilitated.
Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope of the application being indicated by the following claims.
It is to be understood that the application is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The embodiments of the present application described above do not limit the scope of the present application.
Claims (3)
1. An electronic trip action control method for a measuring switch is characterized by comprising the following steps:
acquiring an original current value and a corresponding angular frequency measured by a measuring switch and a preset tripping current trigger value;
calculating an instantaneous current value of the current with obviously reduced aperiodicity according to the angular frequency, and calculating aperiodic components at two adjacent moments according to the instantaneous current value and the original current value;
calculating the instantaneous current value according to the three acquired sampling samples, wherein the instantaneous current value The calculation formula of (2) is as follows:
；
In the method, in the process of the invention, For each sampling time interval of the instantaneous value of the sample current,For the sequence number of the sample current,Is the original current value;
calculating an aperiodic component adjacent to a second sampling time interval and a third sampling time interval according to the instantaneous current value and the original current value, wherein the calculation formula of the aperiodic component is as follows:
；
；
calculating a time constant based on an instantaneous current value and the original current value at the same time as the non-periodic component, and calculating a current phase based on the time constant and the angular frequency;
The time constant is And the current phaseThe calculation formulas of (a) are respectively as follows:
；
；
In the method, in the process of the invention, Is angular frequency;
Calculating a steady state value of the current according to the angular frequency, the time constant and the current phase;
the calculation formula of the steady state value is as follows:
；
Calculating an aperiodic component based on the time constant, the current phase and the steady-state value, calculating a periodic component based on the aperiodic component and the original current value, and differentiating the periodic component to obtain the change rate of the current;
The non-periodic component The calculation formula of (2) is as follows:
；
Correspondingly, the periodic component The calculation formula of (2) is as follows:
；
the calculation formula of the change rate is as follows: ；
judging whether the change rate is larger than the tripping current trigger value or not;
If so, determining that a short circuit occurs and controlling the tripping protection of the measuring switch, if not, determining that the short circuit does not occur and not performing the tripping protection treatment of the measuring switch, returning to the step of calculating an aperiodic component based on the time constant, the current phase and the steady state value, calculating a periodic component based on the aperiodic component and the original current value, and differentiating the periodic component to obtain the change rate of the current.
2. The method for controlling an electronic trip operation of a measuring switch according to claim 1, further comprising, after obtaining the original current value measured by the measuring switch:
judging whether the original current value is equal to zero;
if yes, returning to the step of acquiring the original current value and the corresponding angular frequency measured by the measuring switch;
If not, the step of calculating the instantaneous current value of the non-periodically significantly reduced current in dependence of the angular frequency is entered.
3. The method for controlling an electronic trip operation of a measuring switch according to any one of claims 1 to 2, further comprising, after determining whether the rate of change is greater than the trip current trigger value:
Judging whether the change rate is stable within a preset time range or not;
If yes, returning to the step of determining that the short circuit occurs and controlling the tripping protection of the measuring switch;
if not, returning to the step of determining that the short circuit does not occur and not performing the tripping protection treatment of the measuring switch.
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| CN202310266017.0A CN116365489B (en) | 2023-03-17 | 2023-03-17 | Electronic tripping action control method for measuring switch |
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| CN202310266017.0A CN116365489B (en) | 2023-03-17 | 2023-03-17 | Electronic tripping action control method for measuring switch |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102867085A (en) * | 2012-09-04 | 2013-01-09 | 山东大学 | Method for calculating short-circuit current of power system with double-fed wind generator set |
| CN110058119A (en) * | 2019-03-18 | 2019-07-26 | 昆明理工大学 | A kind of failure using Attenuation-corrected algorithm selects pole method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2741389B1 (en) * | 2012-12-10 | 2015-09-09 | Alstom Technology Ltd | Ground fault direction determination for medium or high voltage distribution networks |
| CN113595037A (en) * | 2021-08-06 | 2021-11-02 | 云南电网有限责任公司红河供电局 | Comprehensive protection method and system for transformer substation |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102867085A (en) * | 2012-09-04 | 2013-01-09 | 山东大学 | Method for calculating short-circuit current of power system with double-fed wind generator set |
| CN110058119A (en) * | 2019-03-18 | 2019-07-26 | 昆明理工大学 | A kind of failure using Attenuation-corrected algorithm selects pole method |
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