CN112834808B - Lightning invasion wave monitoring method and system - Google Patents
Lightning invasion wave monitoring method and system Download PDFInfo
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- CN112834808B CN112834808B CN202011640810.5A CN202011640810A CN112834808B CN 112834808 B CN112834808 B CN 112834808B CN 202011640810 A CN202011640810 A CN 202011640810A CN 112834808 B CN112834808 B CN 112834808B
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- 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
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/17—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values giving an indication of the number of times this occurs, i.e. multi-channel analysers
Abstract
The application discloses thunder and lightning invasion wave monitoring method and system, acquire arrester incoming current signal as invasion wave trigger signal, acquire secondary voltage signal from voltage transformer's secondary side, when arrester incoming current exceeds a certain level record and discern voltage transformer secondary voltage, because thunder and lightning invasion wave passes through voltage transformer, produce the oscillatory wave at its secondary side, be difficult to directly perceivedly discern, for this reason, carry out the back calculation to the voltage transformer secondary voltage signal who acquires based on mutual-inductor wide band characteristic correction method, convert the primary voltage signal of single impulse voltage waveform into with the secondary oscillation voltage waveform that acquires, and acquire the characteristic quantity information of primary voltage signal, thereby to the thunder and lightning invasion is evaluateed insulating cumulative effect after the long-term operation. The technical problems that the existing transformer substation lightning invasion monitoring mode needs to change the wiring of the existing equipment or the voltage monitoring device installed during power failure, the use cost is high and the practicability is low are solved.
Description
Technical Field
The application relates to the technical field of lightning monitoring, in particular to a method and a system for monitoring lightning invasion waves.
Background
The overvoltage caused by lightning invasion waves is an important reason for damaging electric power equipment, the amplitude and gradient of lightning waves invading a transformer substation cannot be monitored by the conventional primary equipment, and although a lightning arrester discharge counter can record and reflect whether the lightning invades, on one hand, the action dispersity is high, and on the other hand, the lightning arrester discharge counter is difficult to act on voltage waves with low amplitude, so that the lightning falling situation cannot be confirmed. At present, various special voltage monitoring devices are also arranged on the market for monitoring thunderbolts, but the wiring of the existing equipment needs to be changed or the voltage monitoring devices are installed when power failure occurs, so that the use cost is higher and the practicability is lower.
Disclosure of Invention
The application provides a lightning invasion wave monitoring method and system for solving the technical problems that the existing transformer substation lightning invasion monitoring mode needs to change the wiring of the existing equipment or the voltage monitoring device is installed in power failure, the use cost is high and the practicability is low.
In view of this, the first aspect of the present application provides a lightning intruding wave monitoring method, including:
monitoring whether lightning current exists in a down lead of an outgoing line arrester of the power distribution network in real time;
if the down lead of the outgoing line arrester has lightning current, acquiring a secondary voltage signal of a voltage transformer of a bus where the capacitor bank is located;
correcting the secondary voltage signal based on a transformer broadband characteristic correction method to obtain an original primary voltage signal;
acquiring characteristic quantity information of an original primary voltage signal, wherein the characteristic quantity information comprises wave head time, wave signal amplitude, wave signal gradient and wave tail time;
and evaluating the insulation accumulation effect of lightning invasion after the transformer substation equipment runs for a long time according to the characteristic quantity information of the original primary voltage signal.
Optionally, the correcting the secondary voltage signal based on a transformer broadband characteristic correcting method to obtain an original primary voltage signal includes:
and establishing a transformer broadband model, and converting and reducing the secondary voltage signal into a single impulse voltage waveform to obtain an original primary voltage signal.
Optionally, the evaluation of the insulation cumulative effect caused by lightning invasion after the long-term operation of the substation equipment according to the characteristic quantity information of the original primary voltage signal includes:
and counting the lightning stroke frequency suffered by the substation equipment in unit time during long-term operation and the corresponding characteristic quantity information, selecting a reduction coefficient of the insulation strength on the basis of an initial value according to the lightning stroke frequency and the corresponding characteristic quantity information, and if the insulation level of the substation equipment cannot bear the signal amplitude obtained by monitoring after long-term operation or the margin cannot meet the requirement, evaluating the result that the substation equipment has operation potential safety hazard.
Alternatively, the unit time is one year.
Optionally, the lightning current of the outgoing line lightning arrester down lead of the power distribution network is monitored in real time through a discharge counter or a current sensor arranged on the outgoing line lightning arrester down lead.
The present application provides in a second aspect a lightning ingress monitoring system comprising:
the lightning monitoring unit is used for monitoring whether lightning current exists in a down lead of an outgoing line arrester of the power distribution network in real time;
the secondary voltage acquisition unit is used for acquiring a secondary voltage signal of a voltage transformer of a bus where the capacitor bank is located if a lightning current exists on a down lead of the outgoing line lightning arrester;
the voltage correction unit is used for correcting the secondary voltage signal based on a transformer broadband characteristic correction method to obtain an original primary voltage signal;
the characteristic quantity acquiring unit is used for acquiring characteristic quantity information of the original primary voltage signal, wherein the characteristic quantity information comprises wave head time, wave signal amplitude, wave signal gradient and wave tail time;
and the evaluation unit is used for evaluating the insulation accumulation effect of the transformer substation equipment subjected to lightning invasion after long-term operation according to the characteristic quantity information of the original primary voltage signal.
Optionally, the voltage correction unit is specifically configured to:
and establishing a transformer broadband model, and converting and reducing the secondary voltage signal into a single impulse voltage waveform to obtain an original primary voltage signal.
Optionally, the evaluation unit is specifically configured to:
and counting lightning stroke frequency suffered by the substation equipment in unit time during long-term operation and corresponding characteristic quantity information, selecting a reduction coefficient of the insulation strength on the basis of an initial value according to the lightning stroke frequency and the corresponding characteristic quantity information, and if the insulation level of the substation equipment cannot bear the signal amplitude obtained by monitoring after long-term operation or the margin cannot meet the requirement, evaluating the result that the substation equipment has operation potential safety hazard.
Alternatively, the unit time is one year.
Optionally, the lightning monitoring unit comprises:
and the discharge counter or the current sensor is arranged on the down lead of the outgoing line arrester.
According to the technical scheme, the embodiment of the application has the following advantages:
the application provides a lightning invasion wave monitoring method, which comprises the following steps: monitoring whether lightning current exists in a down lead of an outgoing line arrester of the power distribution network in real time; if the down lead of the outgoing line arrester has lightning current, acquiring a secondary voltage signal of a voltage transformer of a bus where the capacitor bank is located; correcting the secondary voltage signal based on a transformer broadband characteristic correction method to obtain an original primary voltage signal; acquiring characteristic quantity information of an original primary voltage signal, wherein the characteristic quantity information comprises wave head time, wave signal amplitude, wave signal gradient and wave tail time; and evaluating the insulation accumulation effect of lightning invasion after the transformer substation equipment operates for a long time according to the characteristic quantity information of the original primary voltage signal.
The application provides a thunder and lightning invasion wave monitoring method, acquire arrester incoming current signal as invasion wave trigger signal, acquire secondary voltage signal from voltage transformer's secondary side, record and discern voltage transformer secondary voltage when arrester incoming current exceeds a certain level, because thunder and lightning invasion wave passes through voltage transformer, produce the oscillating wave at its secondary side, be difficult to directly perceivedly discern, for this reason, carry out the back calculation to the voltage transformer secondary voltage signal who acquires based on mutual-inductor wide band characteristic correction method, turn into the primary voltage signal of single impulse voltage waveform with the secondary oscillation voltage waveform that acquires, and acquire primary voltage signal's characteristic vector information, thereby the thunder and lightning invasion is evaluateed insulating cumulative effect after the long-term operation. This application realizes the monitoring of thunder and lightning on existing voltage transformer basis, and under the installation that does not have a power failure, the circumstances of not having a power failure to test, the secondary voltage signal that only acquires voltage transformer through the backstage carries out the thunder and lightning invasion ripples and distinguishes, for the equipment insulation influence aassessment provides the basis, has solved current transformer substation's thunder and lightning invasion monitoring mode and need change the wiring or the power failure installation voltage monitoring devices of existing equipment, and use cost is higher and the lower technical problem of practicality.
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 lightning ingress monitoring method provided in an embodiment of the present application;
FIG. 2 is a schematic circuit diagram of lightning ingress monitoring provided by embodiments of the present application;
fig. 3 is a schematic structural diagram of a lightning intruding wave monitoring system provided in an embodiment of the present application.
Detailed Description
In order to make those skilled in the art better understand the technical solutions of the present application, 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 the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
Example 1
For ease of understanding, referring to fig. 1 and 2, an embodiment of a lightning intruding wave monitoring method provided by the present application includes:
step 101, monitoring whether lightning current exists in a down lead of an outgoing line arrester of the power distribution network in real time.
It should be noted that, in the embodiment of the present application, lightning current of the outgoing line lightning arrester down conductor is used as a trigger signal, and therefore, it is first necessary to monitor whether lightning current exists in the outgoing line lightning arrester down conductor of the power distribution network. In order to distinguish secondary waveform abnormality of the voltage transformer caused by other system oscillation and avoid recording and storing non-lightning processes, a lightning discharge signal can be acquired from a ground circuit of the lightning arrester through a discharge counter or a current sensor arranged on a down lead of the outgoing lightning arrester, so that a basis is provided for equipment insulation influence evaluation.
And 102, if the down lead of the outgoing line arrester has lightning current, acquiring a secondary voltage signal of a voltage transformer of a bus where the capacitor bank is located.
It should be noted that, considering that the lightning monitoring frequency is very high, it is not necessary to test the secondary voltage at the secondary side of the voltage transformer for a long time, and the requirement on the storage space is large, it is considered that the secondary voltage is triggered and stored only when the lightning is monitored. When the lightning current of the down lead of the outgoing line arrester is monitored, a trigger signal is generated, and a secondary voltage signal is obtained from the secondary side of a voltage transformer of a bus where the capacitor bank is located.
And 103, correcting the secondary voltage signal based on the transformer broadband characteristic correction method to obtain an original primary voltage signal.
It should be noted that, in the embodiment of the present application, a transformer broadband characteristic correction method is used to correct a secondary voltage signal, specifically, a transformer broadband model is established, and an acquired secondary voltage signal is converted into a single impulse voltage signal, so as to obtain an original primary voltage signal. The method comprises the steps of obtaining an equivalent model of the voltage transformer under high frequency by adopting a scattering parameter testing method, and carrying out inverse operation according to the equivalent model on the basis of a secondary voltage signal of the voltage transformer obtained by measurement on the basis of the equivalent model, namely obtaining an original waveform, namely an original primary voltage signal.
And 104, acquiring characteristic quantity information of the original primary voltage signal, wherein the characteristic quantity information comprises wave head time, wave signal amplitude, wave signal gradient and wave tail time.
After obtaining the original primary voltage signal, characteristic quantity information of the lightning wave, such as wave head time, wave signal amplitude, wave signal gradient, and wave tail time, is acquired.
And 105, evaluating the insulation accumulation effect of the transformer substation equipment subjected to lightning invasion after long-term operation according to the characteristic quantity information of the original primary voltage signal.
It should be noted that, the lightning stroke frequency suffered by the substation equipment in unit time (such as one year) during long-term operation and the corresponding characteristic quantity information are counted, the reduction coefficient of the insulation strength on the basis of the initial value is selected according to the lightning stroke frequency and the corresponding characteristic quantity information, and if the insulation level of the substation equipment cannot bear the signal amplitude obtained by monitoring after long-term operation or the margin cannot meet the requirement, the evaluation result indicates that the substation equipment has the operation safety hazard.
The lightning invasion wave monitoring method provided by the embodiment of the application acquires the lightning arrester grounding current signal as an invasion wave trigger signal, acquires a secondary voltage signal from the secondary side of a voltage transformer, records and identifies the secondary voltage of the voltage transformer when the lightning arrester grounding current exceeds a certain level, generates an oscillation wave on the secondary side of the voltage transformer when the lightning invasion wave passes through the voltage transformer, is difficult to visually identify, therefore, the method carries out reverse calculation on the acquired secondary voltage signal of the voltage transformer based on a transformer broadband characteristic correction method, converts the acquired secondary oscillation voltage waveform into a primary voltage signal of a single-impulse voltage waveform, and acquires characteristic quantity information of the primary voltage signal, thereby evaluating the insulation accumulation effect by lightning invasion after long-term operation. This application realizes the monitoring of thunder and lightning on existing voltage transformer basis, and under the installation that does not have a power failure, the circumstances of not having a power failure to test, the secondary voltage signal that only acquires voltage transformer through the backstage carries out the thunder and lightning invasion ripples and distinguishes, for the equipment insulation influence aassessment provides the basis, has solved current transformer substation's thunder and lightning invasion monitoring mode and need change the wiring or the power failure installation voltage monitoring devices of existing equipment, and use cost is higher and the lower technical problem of practicality.
Example 2
For ease of understanding, referring to fig. 2 and 3, the present application provides an embodiment of a lightning intruding wave monitoring system, comprising:
the lightning monitoring unit is used for monitoring whether lightning current exists in a down lead of an outgoing line arrester of the power distribution network in real time;
the secondary voltage acquisition unit is used for acquiring a secondary voltage signal of a voltage transformer of a bus where the capacitor bank is located if a lightning current exists on a down lead of the outgoing line lightning arrester;
the voltage correction unit is used for correcting the secondary voltage signal based on a transformer broadband characteristic correction method to obtain an original primary voltage signal;
the characteristic quantity acquisition unit is used for acquiring characteristic quantity information of the original primary voltage signal, wherein the characteristic quantity information comprises wave head time, wave signal amplitude, wave signal gradient and wave tail time;
and the evaluation unit is used for evaluating the insulation accumulation effect of the transformer substation equipment caused by lightning invasion after long-term operation according to the characteristic quantity information of the original primary voltage signal.
The voltage correction unit is specifically configured to:
and establishing a transformer broadband model, and converting and reducing the secondary voltage signal into a single impulse voltage waveform to obtain an original primary voltage signal.
The evaluation unit is specifically configured to:
and counting lightning stroke frequency suffered by the substation equipment in unit time during long-term operation and corresponding characteristic quantity information, selecting a reduction coefficient of the insulation strength on the basis of an initial value according to the lightning stroke frequency and the corresponding characteristic quantity information, and if the insulation level of the substation equipment cannot bear the signal amplitude obtained by monitoring after long-term operation or the margin cannot meet the requirement, evaluating the result that the substation equipment has operation potential safety hazard.
The unit time is one year.
The lightning monitoring unit includes:
and the discharge counter or the current sensor is arranged on the down lead of the outgoing line arrester.
It should be noted that, in the embodiment of the present application, lightning current of the outgoing line lightning arrester down conductor is used as a trigger signal, and therefore, it is first necessary to monitor whether lightning current exists in the outgoing line lightning arrester down conductor of the power distribution network. In order to distinguish secondary waveform abnormality of the voltage transformer caused by other system oscillation and avoid recording and storing non-lightning processes, a lightning discharge signal can be acquired from a ground circuit of the lightning arrester through a discharge counter or a current sensor arranged on a down lead of the outgoing lightning arrester, so that a basis is provided for equipment insulation influence evaluation. Considering that the lightning monitoring frequency is high, the secondary voltage on the secondary side of the voltage transformer is unnecessary to be tested for a long time, and the requirement on the storage space is large, the secondary voltage is only triggered and stored when the lightning is monitored. When the lightning current of the down lead of the outgoing line arrester is monitored, a trigger signal is generated, and a secondary voltage signal is obtained from the secondary side of the voltage transformer of the bus where the capacitor bank is located. In the embodiment of the application, a transformer broadband characteristic correction method is adopted to correct the secondary voltage signal, specifically, a transformer broadband model is established, the obtained secondary voltage signal is converted into a single impulse voltage signal, and an original primary voltage signal is obtained. The method comprises the steps of obtaining an equivalent model of the voltage transformer under high frequency by adopting a scattering parameter testing method, and carrying out inverse operation according to the equivalent model on the basis of a secondary voltage signal of the voltage transformer obtained by measurement on the basis of the equivalent model, namely obtaining an original waveform, namely an original primary voltage signal. After the original primary voltage signal is obtained, characteristic quantity information such as wave head time, wave signal amplitude, wave signal gradient and wave tail time of the lightning wave is obtained. Counting the lightning stroke frequency suffered by the substation equipment in unit time (such as one year) during long-term operation and the corresponding characteristic quantity information, selecting a reduction coefficient of the insulation strength on the basis of an initial value according to the lightning stroke frequency and the corresponding characteristic quantity information, and if the insulation level of the substation equipment cannot bear the signal amplitude obtained by monitoring after long-term operation or the margin cannot meet the requirement, judging that the operation safety hidden danger exists in the substation equipment according to the evaluation result.
The lightning invasion wave monitoring system that this application embodiment provided acquires the arrester and goes into ground current signal and regard as invasion wave trigger signal, acquire secondary voltage signal from voltage transformer's secondary side, record and discern voltage transformer secondary voltage when the arrester goes into ground current and surpass certain level, because the lightning invasion wave passes through voltage transformer, produce the oscillating wave at its secondary side, be difficult to directly perceivedly discern, for this reason, carry out the back calculation to the voltage transformer secondary voltage signal who acquires based on mutual-inductor wide band characteristic correction method, turn into the primary voltage signal of single impulse voltage waveform with the secondary oscillation voltage waveform that acquires, and acquire primary voltage signal's characteristic vector information, thereby to the lightning invasion assesses insulating cumulative effect after the long-term operation. This application realizes the monitoring of thunder and lightning on existing voltage transformer basis, and under the installation that does not have a power failure, the circumstances of not having a power failure to test, the secondary voltage signal that only acquires voltage transformer through the backstage carries out the thunder and lightning invasion ripples and distinguishes, for the equipment insulation influence aassessment provides the basis, has solved current transformer substation's thunder and lightning invasion monitoring mode and need change the wiring or the power failure installation voltage monitoring devices of existing equipment, and use cost is higher and the lower technical problem of practicality.
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 of the embodiments of the present application.
Claims (4)
1. A lightning ingress monitoring method, comprising:
monitoring whether the outgoing line arrester down lead of the power distribution network has lightning current in real time, specifically, monitoring whether the outgoing line arrester down lead of the power distribution network has the lightning current in real time through a discharge counter or a current sensor arranged on the outgoing line arrester down lead;
if the down lead of the outgoing line arrester has lightning current, acquiring a secondary voltage signal of a voltage transformer of a bus where the capacitor bank is located;
correcting the secondary voltage signal based on a transformer broadband characteristic correction method to obtain an original primary voltage signal, comprising the following steps of:
establishing a transformer broadband model, and converting and reducing the secondary voltage signal into a single impulse voltage waveform to obtain an original primary voltage signal;
acquiring characteristic quantity information of an original primary voltage signal, wherein the characteristic quantity information comprises wave head time, wave signal amplitude, wave signal gradient and wave tail time;
according to the characteristic quantity information of the original primary voltage signal, the insulation accumulation effect of the transformer substation equipment after long-term operation caused by lightning invasion is evaluated, and the method comprises the following steps:
and counting the lightning stroke frequency suffered by the substation equipment in unit time during long-term operation and the corresponding characteristic quantity information, selecting a reduction coefficient of the insulation strength on the basis of an initial value according to the lightning stroke frequency and the corresponding characteristic quantity information, and if the insulation level of the substation equipment cannot bear the signal amplitude obtained by monitoring after long-term operation or the margin cannot meet the requirement, evaluating the result that the substation equipment has operation potential safety hazard.
2. The lightning ingress monitoring method of claim 1 where the unit of time is one year.
3. A lightning ingress monitoring system, comprising:
thunder and lightning monitoring unit for real-time supervision distribution network be qualified for the next round of competitions the arrester downlead and whether have lightning current, include:
the discharge counter or the current sensor is arranged on a down lead of the outgoing line arrester;
the secondary voltage acquisition unit is used for acquiring a secondary voltage signal of a voltage transformer of a bus where the capacitor bank is located if a down lead of the outgoing line arrester has lightning current;
the voltage correction unit is used for correcting the secondary voltage signal based on a transformer broadband characteristic correction method to obtain an original primary voltage signal, and is specifically used for:
establishing a transformer broadband model, and converting and reducing the secondary voltage signal into a single impulse voltage waveform to obtain an original primary voltage signal;
the characteristic quantity acquiring unit is used for acquiring characteristic quantity information of the original primary voltage signal, wherein the characteristic quantity information comprises wave head time, wave signal amplitude, wave signal gradient and wave tail time;
the evaluation unit is used for evaluating the insulation accumulation effect of the transformer substation equipment caused by lightning invasion after long-term operation according to the characteristic quantity information of the original primary voltage signal, and is specifically used for:
and counting lightning stroke frequency suffered by the substation equipment in unit time during long-term operation and corresponding characteristic quantity information, selecting a reduction coefficient of the insulation strength on the basis of an initial value according to the lightning stroke frequency and the corresponding characteristic quantity information, and if the insulation level of the substation equipment cannot bear the signal amplitude obtained by monitoring after long-term operation or the margin cannot meet the requirement, evaluating the result that the substation equipment has operation potential safety hazard.
4. The lightning ingress monitoring system of claim 3 where the unit of time is one year.
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