CN112287523B - Method and device for detecting overvoltage of circuit breaker under multiple lightning strokes - Google Patents
Method and device for detecting overvoltage of circuit breaker under multiple lightning strokes Download PDFInfo
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Abstract
The invention discloses a method and a device for detecting overvoltage of a circuit breaker under multiple lightning strokes, wherein the method comprises the following steps: and collecting equipment data in a station, and establishing a line-transformer substation lightning intrusion wave simulation model in an electromagnetic transient program according to the equipment data in the station, wherein the circuit breaker is simulated through a Cassie arc model, and a multi-lightning counter-striking tower and a shielding failure wire are adopted in the simulation model to acquire the lightning overvoltage of the circuit breaker in real time. The invention solves the problems that the overvoltage of the circuit breaker is difficult to simulate under multiple lightning strokes and the simulation result is inaccurate.
Description
Technical Field
The invention relates to the field of lightning protection of power system substation equipment, in particular to a method for detecting overvoltage of a circuit breaker under multiple lightning strokes of the circuit breaker.
Background
In recent years, five-province lightning activities in the south are frequent, the failure rate of power transmission and transformation equipment caused by lightning strike is high, and particularly, the event of explosion of a breaker device fracture in an open type transformer substation caused by lightning intrusion wave often occurs, so that the safe and stable operation of a power grid is seriously threatened. The research at home and abroad shows that more than 30% of the natural mines are multiple mines, the multiple mines are multiple charge centers in the lightning cloud discharged to the ground, after the cloud-to-ground flash occurs in the first charge center, the subsequent charge centers continue to discharge along the front discharge channel, the discharge times are generally 2-3 times, the longest monitored time reaches 42 times, and the discharge interval time of each time is generally 0.6ms-800ms. Analysis shows that breaker explosion cases in the south network range are basically caused by multiple lightning strokes. Therefore, the research on the overvoltage level of the invasion wave on the breaker equipment in the transformer substation under multiple lightning strokes and the protection measures thereof has important significance for the lightning protection design of the breaker and ensuring the safe and reliable operation of the breaker.
However, in the prior art, when the overvoltage detection of the circuit breaker under the lightning invasion wave is carried out, the circuit breaker is subjected to equivalent modeling by adopting an inlet capacitor, and the overvoltage level of the circuit breaker under the lightning stroke is simulated by separating into a brake and a brake, and the modeling method is basically satisfactory to a common single lightning stroke, but for multiple lightning strokes, the state of the circuit breaker is not only the two states of separating and closing but also the situation that the arc is reburned due to the lightning stroke in the separating and brake process, and a large number of processes of dissociating, releasing, diffusing and compounding exist after the arc reburning, and the processes involve the combined action of the electromagnetic field and the airflow field and the transmission of responsible light and heat energy, which adversely affect the voltage level between the contacts of the circuit breaker, so that the voltage level of the circuit breaker is influenced mutually, the overvoltage of the circuit breaker under the multiple lightning stroke is difficult to simulate by directly adopting the traditional inlet capacitor for equivalent modeling, and the problem that the calculation result is inaccurate exists.
Disclosure of Invention
In order to solve the problems, the invention provides a method for detecting the overvoltage of a circuit breaker under multiple lightning strokes, which solves the problems that the overvoltage of the circuit breaker under multiple lightning strokes is difficult to simulate and the simulation result is inaccurate.
The invention provides a method for detecting overvoltage of a circuit breaker under multiple lightning strokes, which comprises the following steps:
collecting data of equipment in a station; the in-station equipment data comprise related parameters of lines, towers, insulator strings, circuit breakers, and main equipment electrical plan views and equipment in a transformer substation;
establishing a line-transformer substation lightning intrusion wave simulation model in an electromagnetic transient program according to the in-station equipment data, wherein the circuit breaker is simulated through a Cassie arc model;
and adopting a multi-lightning counter-striking tower and a shielding failure wire in the simulation model to acquire the lightning overvoltage of the circuit breaker in real time.
Preferably, the establishing a line-transformer substation lightning intrusion wave simulation model in an electromagnetic transient program according to the in-station equipment data specifically includes:
establishing a line model by adopting a JMati frequency correlation model, establishing a pole tower model by adopting a multi-wave impedance model, establishing an insulator string model by adopting a pilot development model, establishing a pole tower grounding resistance model by adopting a nonlinear resistance model, establishing a station interconnection line by adopting a wave impedance model, simulating a circuit breaker by adopting a Cassie arc model, and simulating equipment such as an isolating switch, a current transformer and the like by adopting an inlet capacitance equivalent;
and combining the model and the equipment to establish a line-transformer substation lightning intrusion wave simulation model.
Preferably, the circuit breaker is simulated by a Cassie arc model, and specifically comprises:
the Cassie arc model was established by the following model:
where U is the arc voltage, g is the arc conductance, i is the arc current, U 0 (g) Is steady state arc voltage, t 0 (g) Are time constants, all are functions of conductance g.
Preferably, the multiple lightning counter-striking towers and shielding wires are adopted in the simulation model, and lightning overvoltage of the circuit breaker is obtained in real time, which specifically comprises the following steps:
adopting continuous lightning current pulse to realize the simulation of multiple mines;
when multiple lightning strikes against the tower, determining the lightning current amplitude value under each strike;
when multiple lightning shielding wires are adopted, determining the lightning current amplitude value under each shielding operation;
and acquiring the lightning overvoltage on the circuit breaker, which changes along with the lightning current amplitude value, in real time according to the lightning current amplitude value under each counterattack and the lightning current amplitude value under each shielding failure.
Preferably, the establishing a line-transformer substation lightning intrusion wave simulation model in an electromagnetic transient program according to the in-station equipment data further specifically includes:
when the simulation model is established, the overvoltage simulation model of the circuit breaker is considered, wherein the influence of the power frequency voltage and the induced lightning voltage is considered, and the induced lightning voltage is calculated according to the following formula:
wherein u is the induced lightning voltage, i is the lightning current amplitude, h c Is the average height of the wire, h g And k is the coupling coefficient of the ground wire and is the average height of the ground wire.
Preferably, when the multi-lightning-strike tower is adopted, determining the lightning current amplitude value under each strike specifically includes:
when a multi-lightning counterattack tower is adopted, determining a first counterattack lightning current amplitude under the multi-lightning, wherein the first counterattack lightning current amplitude is selected according to a system voltage level;
and after the first lightning stroke, reducing the subsequent back-striking lightning current amplitude value at intervals of back-striking according to a preset proportion.
Preferably, when the multiple lightning shielding failure wires are adopted, determining the lightning current amplitude value under each shielding failure specifically includes:
when multiple lightning shielding strokes are adopted, determining a first shielding stroke lightning current amplitude value, wherein the first shielding stroke lightning current amplitude value adopts the maximum shielding stroke current, and the maximum shielding stroke lightning current is calculated and determined by a tower electric geometric model;
and after the first shielding failure, reducing the subsequent shielding failure lightning current amplitude value according to a preset proportion at intervals of one back failure.
In another aspect, an embodiment of the present invention provides a device for detecting an overvoltage of a circuit breaker under multiple lightning strokes, including:
the device data acquisition unit is used for acquiring the device data in the station; the in-station equipment data comprise related parameters of lines, towers, insulator strings, circuit breakers, and main equipment electrical plan views and equipment in a transformer substation;
the model building unit is used for building a line-transformer substation lightning intrusion wave simulation model in an electromagnetic transient program according to the in-station equipment data, wherein the circuit breaker is simulated through a Cassie arc model;
the voltage acquisition unit is used for acquiring the lightning overvoltage of the circuit breaker in real time by adopting a multi-lightning counter-striking tower and a shielding failure wire in the simulation model.
Further, the voltage acquisition unit includes:
a lightning stroke simulation determination subunit, configured to implement multiple lightning simulation by using continuous lightning current pulses;
the lightning current back-striking determination subunit is used for determining the lightning current amplitude value under each back-striking when the multi-lightning back-striking tower is adopted;
the lightning current shielding failure determination subunit is used for determining the lightning current amplitude value under each shielding failure when the multiple lightning shielding failure wires are adopted;
the voltage acquisition subunit is used for acquiring the lightning overvoltage which changes along with the lightning current amplitude value on the circuit breaker in real time according to the lightning current amplitude value under each counterattack and the lightning current amplitude value under each shielding failure.
Further, in the model building unit, the circuit breaker is simulated by a Cassie arc model, and specifically includes:
the Cassie arc model was established by the following model:
where U is the arc voltage, g is the arc conductance, i is the arc current, U 0 (g) Is steady state arc voltage, t 0 (g) Is a time constant, U 0 (g) And t 0 (g) All as a function of the conductance g.
The method and the device for detecting the overvoltage of the circuit breaker under multiple lightning strokes have the following remarkable effects:
according to the method and the device for detecting the overvoltage of the circuit breaker under multiple lightning strokes, the circuit breaker is simulated by introducing the Cassie arc model in the process of establishing the simulation model in the electromagnetic transient program, so that the establishment of the dynamic arc model of the circuit breaker is realized, the switching-on and switching-off process of the circuit breaker is equivalent to the dynamic change process of arc conductance (resistance), and when the arc current is very large, the resistance is very small and is equivalent to the closing operation of the circuit breaker; when the arc current is very small, the resistance is very large, which is equivalent to open-circuit operation of the circuit breaker, and the problem that the overvoltage of the circuit breaker is difficult to simulate in real time under multiple lightning strokes is solved; meanwhile, the overvoltage level of the circuit breaker under the maximum winding current is considered when the simulation of the overvoltage of the circuit breaker is realized, the problem that the simulation result of the overvoltage is inaccurate due to the fact that the overvoltage of the circuit breaker is induced only under the counterattack condition is avoided, and the simulation result of the overvoltage of the circuit breaker is more accurate.
Drawings
FIG. 1 is a flow chart of a method for detecting overvoltage of a circuit breaker under multiple lightning strokes in an embodiment of the invention;
fig. 2 is a schematic diagram of overvoltage simulation of a circuit breaker according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of lightning current amplitude variation under 5-fold lightning strike according to an embodiment of the invention;
FIG. 4 is a block diagram of a device for detecting overvoltage of a circuit breaker under multiple lightning strokes in an embodiment of the invention;
fig. 5 is a detailed device diagram of a voltage acquisition unit in a device for detecting overvoltage of a circuit breaker under multiple lightning strokes in an embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, a flowchart of a method for detecting overvoltage of a circuit breaker under multiple lightning strokes is provided in embodiment 1 of the present invention.
The embodiment of the invention provides a method for detecting overvoltage of a circuit breaker under multiple lightning strokes, which comprises the following steps of S1-S3:
s1, collecting in-station equipment data; the in-station equipment data comprise related parameters of lines, towers, insulator strings, circuit breakers, and main equipment electrical plan views and equipment in a transformer substation.
S2, establishing a line-transformer substation lightning intrusion wave simulation model in an electromagnetic transient program according to the in-station equipment data, wherein the circuit breaker is simulated through a Cassie arc model.
Preferably, in the step S2, the establishing a line-substation lightning intrusion wave simulation model in an electromagnetic transient program according to the in-station device data includes:
establishing a line model by adopting a JMati frequency correlation model, establishing a pole tower model by adopting a multi-wave impedance model, establishing an insulator string model by adopting a pilot development model, establishing a pole tower grounding resistance model by adopting a nonlinear resistance model, establishing a station interconnection line by adopting a wave impedance model, simulating a circuit breaker by adopting a Cassie arc model, and simulating equipment such as an isolating switch, a current transformer and the like by adopting an inlet capacitance equivalent;
and combining the model and the equipment to establish a line-transformer substation lightning intrusion wave simulation model.
As a preferred embodiment of the present invention, the embodiment of the present invention establishes an overvoltage simulation model of the circuit breaker in consideration of the influence of the power frequency voltage and the induced lightning voltage in an electromagnetic transient program, and determines by the following manner when the power frequency voltage is considered: the power frequency voltage takes positive polarity peak value during counterattack, the power frequency voltage takes negative polarity peak value during winding attack, and the power frequency voltage is simulated by adopting a constant voltage source.
It should be noted that, the calculation of the induced lightning voltage is realized by the following formula (2):
wherein u is the induced lightning voltage, i is the lightning current, h c Is the average height of the wire, h g And k is the coupling coefficient of the ground wire and is the average height of the ground wire. During electromagnetic transient program simulation, MODELS and TACS modules are adopted, firstly, the coupling coefficient k of a ground wire and a three-phase wire is calculated by utilizing structural parameters of a tower, then the induced voltage which changes in real time along with lightning current is calculated in the MODELS module according to a formula (2), and the induced voltage u and the line operation voltage u during lightning stroke are calculated by utilizing the TACS module 0 And a voltage u coupled to the conductor by ground 1 Applied to the conductor where the lightning tower is located, in order to simulate the actual effect of the induced voltage.
Preferably, when the step S2 interrupt router adopts the Cassie arc model simulation, the Cassie arc model of the following (1) is first used:
where U is the arc voltage, g is the arc conductance, i is the arc current, u=gi, U 0 (g) Is steady state arc voltage, t 0 (g) Are time constants, all are functions of conductance g.
Referring to fig. 2, an overvoltage simulation schematic diagram of a circuit breaker provided by the embodiment of the invention is that when a MODELS module is used for realizing a formula (1) in an electromagnetic transient program, an initial value is set, then the model is used for realizing the circuit breaker by using a model language, the model module outputs a dynamic arc resistance value R (1/g), the value is coupled into a circuit through a nonlinear resistor controlled by TACS to participate in real-time simulation calculation, then the electromagnetic transient program uses the arc resistance to output the overvoltage at two ends of a circuit breaker contact, and the real-time simulation of the circuit breaker voltage is realized through continuous loop iteration.
And S3, adopting a multi-lightning counter-striking tower and a shielding failure wire in the simulation model, and acquiring the lightning overvoltage of the circuit breaker in real time.
In the concrete implementation, the tower top and the winding wire are respectively struck by multiple lightning current on a tower of an incoming line segment and the wire within the range of 2km of the transformer substation, and the magnitude of the induced lightning overvoltage on a breaker in the substation is observed and recorded under the condition that the lightning current strikes against different towers and winding wires. When the overvoltage on the in-station breaker exceeds the insulation design level under multiple lightning strokes, the installation station of the outgoing line side of the breaker can be considered to be protected by a gapless lightning arrester, and the installation distance of the lightning arrester is obtained by the simulation result of an electromagnetic transient program.
Specifically, the step S3 further includes S31 to S34:
s31, adopting continuous lightning current pulse to realize simulation of multiple mines.
S32, when the multi-lightning counter-strike tower is adopted, determining the lightning current amplitude value under each counter-strike.
When a multi-lightning counterattack tower is adopted, determining a first counterattack lightning current amplitude under the multi-lightning, wherein the first counterattack lightning current amplitude is selected according to a system voltage level; and after the first lightning stroke, reducing the subsequent back-striking lightning current amplitude value at intervals of back-striking according to a preset proportion.
Referring to fig. 3, a schematic diagram of a change in lightning current amplitude under 5-fold lightning strike is provided in the embodiment of the present invention, and because the lightning current amplitude of multiple lightning strikes of an actual multiple lightning strike is generally smaller than that of the previous lightning strike, in this embodiment, during simulated counterattack and shielding failure simulation calculation, the subsequent counterattack current amplitude is sequentially decreased according to a proportion of 5%, and the counterattack frequency n, the counterattack interval t of the multiple lightning strike, and the lightning current steepness can be selected according to the actual situation.
And S33, when the multiple lightning shielding failure leads are adopted, determining the lightning current amplitude value under each shielding failure.
When multiple lightning shielding strokes are adopted, determining a first shielding stroke lightning current amplitude value, wherein the first shielding stroke lightning current amplitude value adopts the maximum shielding stroke current, and the maximum shielding stroke lightning current is calculated and determined by a tower electric geometric model; and after the first shielding failure, reducing the subsequent shielding failure lightning current amplitude value according to a preset proportion at intervals of one back failure.
S34, acquiring the lightning overvoltage of the circuit breaker, which changes along with the lightning current amplitude value, in real time according to the lightning current amplitude value under each counterattack and the lightning current amplitude value under each shielding failure.
Referring to fig. 4, another aspect of the present invention provides a simulation apparatus for a breaker overvoltage under multiple lightning strokes, which includes a device data acquisition unit 1, a model building unit 2, a voltage acquisition unit 3, and a distance acquisition unit 4.
The device data acquisition unit 1 is used for acquiring in-station device data; the in-station equipment data comprise related parameters of lines, towers, insulator strings, circuit breakers, and main equipment electrical plan views and equipment in a transformer substation.
The model building unit 2 is used for building a line-transformer substation lightning intrusion wave simulation model in an electromagnetic transient program according to the in-station equipment data, wherein the circuit breaker is simulated through a Cassie arc model.
The voltage acquisition unit 3 is used for acquiring the lightning overvoltage of the circuit breaker in real time by adopting a multi-lightning counter-striking tower and a shielding failure wire in the simulation model.
Specifically, in the model building unit 2, when the circuit breaker is simulated by using the Cassie arc model, the Cassie arc model is first based on the following (1):
where U is the arc voltage, g is the arc conductance, i is the arc current, u=gi, U 0 (g) Is steady state arc voltage, t 0 (g) Are time constants, all are functions of conductance g.
Referring to fig. 2, an overvoltage simulation schematic diagram of a circuit breaker provided by the embodiment of the invention is that when a MODELS module is used for realizing a formula (1) in an electromagnetic transient program, an initial value is set, then the model is used for realizing the circuit breaker by using a model language, the model module outputs a dynamic arc resistance value R (1/g), the value is coupled into a circuit through a nonlinear resistor controlled by TACS to participate in real-time simulation calculation, then the electromagnetic transient program uses the arc resistance to output the overvoltage at two ends of a circuit breaker contact, and the real-time simulation of the circuit breaker voltage is realized through continuous loop iteration.
Referring to fig. 5, specifically, the voltage acquisition unit 3 further includes a lightning strike simulation determination subunit 31, a lightning strike current determination subunit 32, a lightning shielding failure current determination subunit 33, and a voltage acquisition subunit 34.
The lightning stroke simulation determination subunit 31 is configured to implement multiple lightning simulation by adopting continuous lightning current pulses;
the lightning current counter-striking determination subunit 32 is configured to determine a lightning current amplitude value under each counter-striking when the multi-lightning counter-striking tower is adopted;
when a multi-lightning counterattack tower is adopted, determining a first counterattack lightning current amplitude under the multi-lightning, wherein the first counterattack lightning current amplitude is selected according to a system voltage level; and after the first lightning stroke, reducing the subsequent back-striking lightning current amplitude value at intervals of back-striking according to a preset proportion.
Referring to fig. 3, a schematic diagram of a change in lightning current amplitude under 5-fold lightning strike is provided in the embodiment of the present invention, and since multiple lightning strike lightning current assignments of an actual multiple lightning strike are generally smaller than those of the previous lightning strike, in this embodiment, when simulated counterattack and shielding failure are calculated, the subsequent counterattack current amplitude is sequentially decreased according to a proportion of 5%, and the number of counterattack times n, the counterattack interval t of the multiple lightning strike and the lightning current steepness can be selected according to the actual situation.
The lightning current determination subunit 33 is configured to determine the lightning current amplitude value under each lightning shielding failure when multiple lightning shielding failure wires are used.
When multiple lightning shielding strokes are adopted, determining a first shielding stroke lightning current amplitude value, wherein the first shielding stroke lightning current amplitude value adopts the maximum shielding stroke current, and the maximum shielding stroke lightning current is calculated and determined by a tower electric geometric model; and after the first shielding failure, reducing the subsequent shielding failure lightning current amplitude value according to a preset proportion at intervals of one back failure.
The voltage acquisition subunit is used for acquiring the lightning overvoltage on the circuit breaker, which changes along with the lightning current amplitude value, in real time according to the lightning current amplitude value under each counterattack and the lightning current amplitude value under each shielding failure.
The method and the device for detecting the overvoltage of the circuit breaker under multiple lightning strokes have the following remarkable effects:
according to the method and the device for detecting the overvoltage of the circuit breaker under multiple lightning strokes, the circuit breaker is simulated by introducing the Cassie arc model in the process of establishing the simulation model in the electromagnetic transient program, so that the establishment of the dynamic arc model of the circuit breaker is realized, the switching-on and switching-off process of the circuit breaker is equivalent to the dynamic change process of arc conductance (resistance), and when the arc current is very large, the resistance is very small and is equivalent to the closing operation of the circuit breaker; when the arc current is very small, the resistance is very large, which is equivalent to open-circuit operation of the circuit breaker, and the problem that the overvoltage of the circuit breaker is difficult to simulate in real time under multiple lightning strokes is solved; meanwhile, the overvoltage level of the circuit breaker under the maximum winding current is considered when the simulation of the induced lightning overvoltage of the circuit breaker is realized, the problem that the simulation result of the overvoltage is inaccurate due to the fact that the induced lightning overvoltage of the circuit breaker under the counterattack condition is only considered in the past is avoided, and the simulation result of the overvoltage of the circuit breaker is more accurate. Based on the overvoltage of the circuit breaker, the overvoltage is compared with the preset insulation damage level of the circuit breaker, and when the preset insulation damage level of the circuit breaker is reached, a lightning arrester is arranged on the outgoing line side of the circuit breaker, so that the safety of a power station system is further ensured.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.
Claims (7)
1. A method for detecting overvoltage of a circuit breaker under multiple lightning strokes, comprising:
collecting data of equipment in a station; the in-station equipment data comprise related parameters of lines, towers, insulator strings, circuit breakers, and main equipment electrical plan views and equipment in a transformer substation;
establishing a line-transformer substation lightning intrusion wave simulation model in an electromagnetic transient program according to the in-station equipment data, wherein the circuit breaker is simulated through a Cassie arc model;
multiple lightning counterattack towers and shielding failure wires are adopted in the simulation model, and lightning overvoltage of the circuit breaker is obtained in real time;
the method for establishing the line-transformer substation lightning intrusion wave simulation model in the electromagnetic transient program according to the in-station equipment data specifically comprises the following steps:
a JMati frequency correlation model is adopted to build a line model, a multi-wave impedance model is adopted to build a pole tower model,
building an insulator string model by adopting a pilot development model, building a pole tower grounding resistance model by adopting a nonlinear resistance model, building an intra-station connection wire by adopting a wave impedance model, simulating a circuit breaker by adopting a Cassie arc model, and simulating equipment such as an isolating switch, a current transformer and the like by adopting an inlet capacitance equivalent;
combining the model and the equipment to establish a line-transformer substation lightning intrusion wave simulation model;
the circuit breaker is simulated by a Cassie arc model, and specifically comprises:
the Cassie arc model was established by the following model:
，
wherein,ufor the arc voltage to be the same,gis arc conductance，iIn order to be an arc current,for steady state arc voltage>Is a time constant->And->Are all electric conductorsgIs a function of (2).
2. A method of detecting overvoltage of a circuit breaker under multiple lightning strokes as claimed in claim 1, which comprises
The method is characterized in that multiple lightning counter-striking towers and shielding wires are adopted in the simulation model, and lightning overvoltage of the circuit breaker is obtained in real time, and the method specifically comprises the following steps:
adopting continuous lightning current pulse to realize the simulation of multiple mines;
when multiple lightning strikes against the tower, determining the lightning current amplitude value under each strike;
when multiple lightning shielding wires are adopted, determining the lightning current amplitude value under each shielding operation;
and acquiring the lightning overvoltage on the circuit breaker, which changes along with the lightning current amplitude value, in real time according to the lightning current amplitude value under each counterattack and the lightning current amplitude value under each shielding failure.
3. The method for detecting overvoltage of circuit breaker under multiple lightning strokes as claimed in claim 1, wherein
The method for establishing the line-transformer substation lightning intrusion wave simulation model in the electromagnetic transient program according to the in-station equipment data further specifically comprises the following steps:
when the simulation model is established, the overvoltage simulation model of the circuit breaker is considered, wherein the influence of the power frequency voltage and the induced lightning voltage is considered, and the induced lightning voltage is calculated according to the following formula:
，
wherein,uin order to induce a lightning voltage, the voltage is measured,ifor the magnitude of the lightning current,h c as the average height of the wire is the average height of the wire,h g as the average height of the ground wire,kis the coupling coefficient of the conductive wire.
4. A method for detecting overvoltage of circuit breaker under multiple lightning strokes as claimed in claim 2, which comprises
Is characterized in that when the multi-lightning counter-striking tower is adopted, the lightning current amplitude value under each counter-striking is determined, and the method specifically comprises the following steps:
when a multi-lightning counterattack tower is adopted, determining a first counterattack lightning current amplitude under the multi-lightning, wherein the first counterattack lightning current amplitude is selected according to a system voltage level;
and after the first lightning stroke, reducing the subsequent back-striking lightning current amplitude value at intervals of back-striking according to a preset proportion.
5. A method for detecting overvoltage of circuit breaker under multiple lightning strokes as claimed in claim 2, which comprises
The method is characterized in that when the multiple lightning shielding failure conducting wire is adopted, the lightning current amplitude value under each shielding failure is determined, and the method specifically comprises the following steps:
when multiple lightning shielding strokes are adopted, determining a first shielding stroke lightning current amplitude value, wherein the first shielding stroke lightning current amplitude value adopts the maximum shielding stroke current, and the maximum shielding stroke lightning current is calculated and determined by a tower electric geometric model;
and after the first shielding failure, reducing the subsequent shielding failure lightning current amplitude value according to a preset proportion at intervals of one back failure.
6. A device for detecting overvoltage of a circuit breaker under multiple lightning strokes, comprising:
the device data acquisition unit is used for acquiring the device data in the station; the in-station equipment data comprise related parameters of lines, towers, insulator strings, circuit breakers, and main equipment electrical plan views and equipment in a transformer substation;
the model building unit is used for building a line-transformer substation lightning intrusion wave simulation model in an electromagnetic transient program according to the in-station equipment data, wherein the circuit breaker is simulated through a Cassie arc model;
the voltage acquisition unit is used for acquiring the lightning overvoltage of the circuit breaker in real time by adopting a multi-lightning counter-striking tower and a shielding failure wire in the simulation model;
the method for establishing the line-transformer substation lightning intrusion wave simulation model in the electromagnetic transient program according to the in-station equipment data specifically comprises the following steps:
a JMati frequency correlation model is adopted to build a line model, a multi-wave impedance model is adopted to build a pole tower model,
building an insulator string model by adopting a pilot development model, building a pole tower grounding resistance model by adopting a nonlinear resistance model, building an intra-station connection wire by adopting a wave impedance model, simulating a circuit breaker by adopting a Cassie arc model, and simulating equipment such as an isolating switch, a current transformer and the like by adopting an inlet capacitance equivalent;
combining the model and the equipment to establish a line-transformer substation lightning intrusion wave simulation model;
in the model building unit, the circuit breaker is simulated by a Cassie arc model, and specifically comprises:
the Cassie arc model was established by the following model:
，
wherein,ufor the arc voltage to be the same,gis arc conductance，iIn order to be an arc current,for steady state arc voltage>Is a time constant->And->Are all electric conductorsgIs a function of (2).
7. The apparatus for detecting overvoltage of circuit breaker under multiple lightning strokes according to claim 6, wherein the voltage acquisition unit further comprises:
a lightning stroke simulation determination subunit, configured to implement multiple lightning simulation by using continuous lightning current pulses;
the lightning current back-striking determination subunit is used for determining the lightning current amplitude value under each back-striking when the multi-lightning back-striking tower is adopted;
the lightning current shielding failure determination subunit is used for determining the lightning current amplitude value under each shielding failure when the multiple lightning shielding failure wires are adopted;
the voltage acquisition subunit is used for acquiring the lightning overvoltage which changes along with the lightning current amplitude value on the circuit breaker in real time according to the lightning current amplitude value under each counterattack and the lightning current amplitude value under each shielding failure.
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| CN113178852B (en) * | 2021-04-29 | 2023-01-20 | 广东电网有限责任公司电力科学研究院 | Insulation matching method, device, equipment and medium for lightning invasion waves of transformer substation |
| CN113178853B (en) * | 2021-04-29 | 2023-03-14 | 广东电网有限责任公司电力科学研究院 | Overvoltage protection system for lightning invasion waves on transformer substation line side |
| CN113326613B (en) * | 2021-05-25 | 2022-12-06 | 南方电网科学研究院有限责任公司 | Substation lightning overvoltage simulation calculation method and device based on measured data |
| CN113447768B (en) * | 2021-05-25 | 2022-03-15 | 南方电网科学研究院有限责任公司 | Method and device for evaluating insulation level of circuit breaker under multiple thunder |
| CN113656947A (en) * | 2021-07-28 | 2021-11-16 | 国网电力科学研究院武汉南瑞有限责任公司 | Power transmission line shielding failure lightning-resistant horizontal simulation modeling method under multi-strike effect |
| CN113572143B (en) * | 2021-09-26 | 2022-01-25 | 广东电网有限责任公司 | Lightning protection method and device for power transmission line under multiple lightning strikes |
| CN113962097A (en) * | 2021-10-26 | 2022-01-21 | 广东电网有限责任公司 | Transformer substation lightning overvoltage simulation analysis method, device, terminal and medium |
| CN115098899B (en) * | 2022-06-17 | 2024-09-10 | 华中科技大学 | Multiple lightning strike risk grading method considering equipment difference and storage medium |
| CN117929931A (en) * | 2022-10-14 | 2024-04-26 | 李景禄 | Inductive lightning overvoltage simulation test method |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006049008A (en) * | 2004-08-02 | 2006-02-16 | Kansai Electric Power Co Inc:The | Breaker measuring device and breaker measuring system provided with it |
| JP2011055650A (en) * | 2009-09-02 | 2011-03-17 | Nobukimi Watanabe | Overvoltage protector and distribution board |
| WO2014173317A1 (en) * | 2013-04-27 | 2014-10-30 | 国网四川省电力公司电力科学研究院 | Power transmission line lightning electromagnetic transient dynamic simulation experimental system |
| CN104833897A (en) * | 2015-05-06 | 2015-08-12 | 国家电网公司 | Substation line inlet segment lightning stroke positioning method |
| JP2015220083A (en) * | 2014-05-16 | 2015-12-07 | 株式会社東芝 | Device, method and program for evaluating performance of gas circuit breaker |
| JP2017156158A (en) * | 2016-02-29 | 2017-09-07 | 株式会社フランクリン・ジャパン | Lightning position locating system, lightning position locating device and lightning position locating method |
| CN108170964A (en) * | 2018-01-02 | 2018-06-15 | 南方电网科学研究院有限责任公司 | Method for calculating potential of grounding body of lightning pole tower |
| CN109376490A (en) * | 2018-12-12 | 2019-02-22 | 云南电网有限责任公司电力科学研究院 | A kind of cassie-mayr Simulation of Arc Models method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2817444B1 (en) * | 2000-11-27 | 2003-04-25 | Physiques Ecp Et Chimiques | GENERATORS AND ELECTRICAL CIRCUITS FOR SUPPLYING UNSTABLE HIGH VOLTAGE DISCHARGES |
-
2020
- 2020-10-13 CN CN202011088907.XA patent/CN112287523B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006049008A (en) * | 2004-08-02 | 2006-02-16 | Kansai Electric Power Co Inc:The | Breaker measuring device and breaker measuring system provided with it |
| JP2011055650A (en) * | 2009-09-02 | 2011-03-17 | Nobukimi Watanabe | Overvoltage protector and distribution board |
| WO2014173317A1 (en) * | 2013-04-27 | 2014-10-30 | 国网四川省电力公司电力科学研究院 | Power transmission line lightning electromagnetic transient dynamic simulation experimental system |
| JP2015220083A (en) * | 2014-05-16 | 2015-12-07 | 株式会社東芝 | Device, method and program for evaluating performance of gas circuit breaker |
| CN104833897A (en) * | 2015-05-06 | 2015-08-12 | 国家电网公司 | Substation line inlet segment lightning stroke positioning method |
| JP2017156158A (en) * | 2016-02-29 | 2017-09-07 | 株式会社フランクリン・ジャパン | Lightning position locating system, lightning position locating device and lightning position locating method |
| CN108170964A (en) * | 2018-01-02 | 2018-06-15 | 南方电网科学研究院有限责任公司 | Method for calculating potential of grounding body of lightning pole tower |
| CN109376490A (en) * | 2018-12-12 | 2019-02-22 | 云南电网有限责任公司电力科学研究院 | A kind of cassie-mayr Simulation of Arc Models method |
Non-Patent Citations (2)
| Title |
|---|
| Comparison of transformer winding responses to standard lightning impulses and operational overvoltages;Marek Florkowski等，;《IEEE Transactions on Dielectrics and Electrical Insulation》;第25卷(第3期);全文 * |
| 可变间隙电弧模型下特高压气体绝缘变电站快速暂态过电压的数值计算;李爽等主编;《高电压技术》;第41卷(第4期);全文 * |
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