CN112287523A - 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 strikes, wherein the method comprises the following steps: acquiring station equipment data, and establishing a line-transformer substation lightning invasion wave simulation model in an electromagnetic transient program according to the station equipment data, wherein the circuit breaker is simulated through a Cassie arc model, multiple lightning counterattack pole towers and shielding attack wires are adopted in the simulation model, and the lightning overvoltage of the circuit breaker is acquired in real time. The invention solves the problems that the overvoltage of the circuit breaker under multiple lightning strokes is difficult to simulate and the simulation result is inaccurate.
Description
Technical Field
The invention relates to the field of lightning protection of power system transformation equipment, in particular to a method for detecting overvoltage of a circuit breaker under multiple lightning strikes of the circuit breaker.
Background
In recent years, lightning activities of the southern network, the five provinces and the rural areas are frequent, the fault rate of power transmission and transformation equipment caused by lightning stroke is high, particularly, an accident that a fracture of breaker equipment in an open-type transformer substation explodes due to lightning invasion waves often occurs, and the safe and stable operation of a power grid is seriously threatened. Domestic and foreign researches show that more than 30% of natural landmines are multiple mines, the multiple mines refer to the fact that multiple charge centers exist in the thundercloud discharging to the ground, after the cloud-ground flash occurs to the first charge center, the subsequent charge centers continue to discharge along the front discharge channel, the number of times of discharge is 2-3, the longest time of discharge is 42, and the discharge interval time of each time is 0.6-800 ms. Analysis shows that the explosion cases of the circuit breakers in the south network range are basically caused by multiple lightning strokes. Therefore, the research on the level of the intrusion wave overvoltage on the breaker equipment in the transformer substation under multiple lightning strokes and the protection measures thereof has important significance on the lightning protection design of the breaker and the guarantee of the safe and reliable operation of the breaker.
However, when the prior art detects the overvoltage of the breaker under the lightning invasion wave, the breaker is generally subjected to equivalent modeling by adopting an inlet capacitor and divided into two working conditions of opening and closing to simulate the overvoltage level of the breaker under the lightning stroke, the modeling method can basically meet the requirements for common single lightning stroke, but for multiple lightning strokes, because the state of the breaker is not only in the opening and closing state during the lightning stroke, but also the arc reignition caused by the lightning stroke in the opening and closing process exists, and because the arc reignition has a large amount of processes of dissociation, diffusion and recombination and the transmission of light and heat energy which are responsible, the processes relate to the combined action of an electromagnetic field and an air flow field, and the voltage levels between contacts of the breaker are adversely affected, the traditional inlet capacitor is directly adopted for equivalent modeling, and the overvoltage of the breaker under the multiple lightning stroke is difficult to simulate The size is reduced, and the problem of inaccurate calculation results exists.
Disclosure of Invention
In order to solve the problems, the invention provides a method for detecting overvoltage of a circuit breaker under multiple lightning strokes, and solves the problems that the overvoltage of the circuit breaker under the 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 strikes, which comprises the following steps:
collecting equipment data in a station; the station equipment data comprises lines, towers, insulator strings, circuit breakers, main equipment electrical plane diagrams in the transformer substation and relevant parameters of equipment;
establishing a line-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 multiple lightning counterattack towers and shielding wires are adopted in the simulation model, so that the lightning overvoltage of the circuit breaker is obtained in real time.
Preferably, the establishing a line-substation lightning intrusion wave simulation model in the electromagnetic transient program according to the in-station device data specifically includes:
adopting a JMarti frequency correlation model to establish a line model, adopting a multi-wave impedance model to establish a tower model, adopting a pilot development model to establish an insulator string model, adopting a nonlinear resistance model to establish a tower ground resistance model, adopting a wave impedance model to establish a station internal connection wire, adopting a Cassie arc model to simulate a circuit breaker and equipment such as an inlet capacitance equivalent simulation isolating switch and a current transformer;
and (4) establishing a line-transformer substation lightning invasion wave simulation model by combining the model and the equipment.
Preferably, the circuit breaker is simulated by a Cassie arc model, specifically comprising:
the Cassie arc model was established by the following model:
wherein U is the arc voltage, g is the arc conductance, i is the arc current, U is the arc voltage0(g) For steady state arc voltage, t0(g) Are time constants, and are functions of conductance g.
Preferably, the method for acquiring the lightning overvoltage of the circuit breaker in real time by adopting multiple lightning counterattack towers and shielding wires in the simulation model specifically comprises the following steps:
the simulation of multiple mines is realized by adopting continuous lightning current pulses;
when multiple lightning counterattack towers are adopted, the lightning current amplitude under each counterattack is determined;
when multiple lightning shielding wires are adopted, determining the lightning current amplitude under each shielding failure;
and acquiring lightning overvoltage on the circuit breaker, which changes along with the lightning current amplitude, in real time according to the lightning current amplitude under each counterattack and the lightning current amplitude under each shielding attack.
Preferably, the establishing a line-substation lightning intruding wave simulation model in an electromagnetic transient program according to the in-station device data further specifically includes:
when the simulation model is established, the circuit breaker overvoltage simulation model considering the influence of power frequency voltage and induced lightning voltage is calculated by the following formula:
wherein u is induced lightning voltage, i is lightning current amplitude, hcIs the average height of the wire, hgAnd k is the ground wire average height, and the coupling coefficient of the ground wire is shown as k.
Preferably, when multiple lightning counterattack towers are adopted, determining the lightning current amplitude under each counterattack specifically includes:
when a multi-lightning counterattack tower is adopted, determining the first counterattack lightning current amplitude under multiple lightning, wherein the first counterattack lightning current amplitude is selected according to the system voltage level;
and after the first lightning stroke, reducing the subsequent counterattack lightning current amplitude according to a preset proportion at each back attack interval.
Preferably, when multiple lightning strike leads are adopted, determining the lightning current amplitude under each strike specifically includes:
when multiple lightning shielding failure is adopted, determining the first shielding failure lightning current amplitude, wherein the first shielding failure lightning current amplitude adopts the maximum shielding failure lightning current which is determined by calculation of a tower electrical geometric model;
and after the first shielding failure, reducing the subsequent shielding failure lightning current amplitude according to a preset proportion at each back failure interval.
Another aspect of the embodiments of the present invention provides a device for detecting an overvoltage of a circuit breaker under multiple lightning strikes, including:
the equipment data acquisition unit is used for acquiring equipment data in the station; the station equipment data comprises lines, towers, insulator strings, circuit breakers, main equipment electrical plane diagrams in the transformer substation and relevant parameters of equipment;
the model establishing unit is used for 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 the voltage acquisition unit is used for acquiring the lightning overvoltage of the circuit breaker in real time by adopting multiple lightning counterattack towers and shielding wires in the simulation model.
Further, the voltage acquisition unit includes:
the lightning stroke simulation determining subunit is used for realizing the simulation of multiple lightning by adopting continuous lightning current pulses;
the lightning strike-back current determining subunit is used for determining the lightning current amplitude under each strike-back when multiple lightning strikes the tower;
the lightning current of shielding failure confirms the subunit, is used for while adopting the wire of multiple lightning shielding failure, confirm the magnitude of lightning current under each shielding failure;
and the voltage acquisition subunit is used for acquiring lightning overvoltage which changes along with the lightning current amplitude on the circuit breaker in real time according to the lightning current amplitude under each back-strike and the lightning current amplitude under each shielding strike.
Further, in the model building unit, the circuit breaker is simulated through a Cassie arc model, and the method specifically includes:
the Cassie arc model was established by the following model:
wherein U is the arc voltage, g is the arc conductance, i is the arc current, U is the arc voltage0(g) For steady state arc voltage, t0(g) Is a time constant, U0(g) And t0(g) Are all functions of conductance g.
The invention provides a method and a device for detecting overvoltage of a breaker under multiple lightning strikes, which have the following remarkable effects:
the invention provides a method and a device for detecting the overvoltage of a circuit breaker under multiple lightning strikes, wherein a Cassie arc model is introduced to simulate the circuit breaker in the process of establishing a simulation model in an electromagnetic transient program, so that the establishment of a dynamic arc model of the circuit breaker is realized, the opening and closing 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, which is equivalent to the closed operation of the circuit breaker; when the arc current is very small, the resistance is very large, which is equivalent to the open-circuit operation of the circuit breaker, and the problem that the overvoltage of the circuit breaker under multiple lightning strokes is difficult to simulate in real time is solved; meanwhile, the overvoltage level of the circuit breaker under the maximum shielding failure current is considered when the overvoltage of the circuit breaker is simulated, the problem that the overvoltage simulation result is inaccurate due to the fact that the circuit breaker inducts lightning overvoltage under the counterattack condition is only considered in the past is solved, and the overvoltage simulation result of the circuit breaker is more accurate.
Drawings
FIG. 1 is a flow chart of a method for detecting breaker overvoltage under multiple lightning strikes in an embodiment of the invention;
fig. 2 is a schematic diagram of an overvoltage simulation of a circuit breaker according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the variation of lightning current amplitude under 5-times lightning strike according to an embodiment of the present invention;
fig. 4 is a structural view of a device for detecting an overvoltage of a circuit breaker under multiple lightning strikes in an embodiment of the present invention;
fig. 5 is a detailed apparatus diagram of a voltage acquisition unit in the apparatus for detecting an overvoltage of a circuit breaker under multiple lightning strikes in the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a flowchart of a method for detecting an overvoltage of a circuit breaker under multiple lightning strikes according to embodiment 1 of the present invention is shown.
The method for detecting the overvoltage of the circuit breaker under the multiple lightning strikes comprises the following steps of S1-S3:
s1, collecting equipment data in the station; the station equipment data comprises lines, towers, insulator strings, circuit breakers, main equipment electrical plane diagrams in the transformer substation and relevant parameters of the equipment.
And S2, establishing a line-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 step S2, the establishing a line-substation lightning intruding wave simulation model in the electromagnetic transient program according to the in-station device data in the electromagnetic transient program specifically includes:
adopting a JMarti frequency correlation model to establish a line model, adopting a multi-wave impedance model to establish a tower model, adopting a pilot development model to establish an insulator string model, adopting a nonlinear resistance model to establish a tower ground resistance model, adopting a wave impedance model to establish a station internal connection wire, adopting a Cassie arc model to simulate a circuit breaker and equipment such as an inlet capacitance equivalent simulation isolating switch and a current transformer;
and (4) establishing a line-transformer substation lightning invasion wave simulation model by combining the model and the equipment.
As a preferred embodiment of the present invention, an overvoltage simulation model of a circuit breaker is established in an electromagnetic transient program, which takes the influence of a power frequency voltage and an induced lightning voltage into consideration, and when the power frequency voltage is taken into consideration, the overvoltage simulation model is determined in the following manner: the power frequency voltage takes a positive peak value during counterattack, the power frequency voltage takes a negative peak value during shielding attack, and a constant voltage source is adopted to simulate the power frequency voltage.
It should be noted that, the calculation of the induced lightning voltage is implemented by the following formula (2):
wherein u is induced lightning voltage, i is lightning current, hcIs the average height of the wire, hgAnd k is the ground wire average height, and the coupling coefficient of the ground wire is shown as k. When the electromagnetic transient program is simulated, an MODELS module and a TACS module are adopted, firstly, the coupling coefficient k of the ground wire and the three-phase lead is calculated by using tower structure parameters, then the magnitude of induced voltage changing along with lightning current in real time is calculated in the MODELS module according to a formula (2), and the induced voltage u and the line running voltage u in lightning stroke are calculated by using the TACS module0And the voltage u of the ground line coupled to the conductor1The method is applied to a lead where a lightning pole tower is located, so that the actual influence of the induced voltage is simulated.
Preferably, when the circuit breaker is simulated by using the Cassie arc model in step S2, the Cassie arc model is first based on (1) below:
where U is the arc voltage, g is the arc conductance, i is the arc current, U is gi, U is0(g) For steady state arc voltage, t0(g) Are time constants, and are functions of conductance g.
Referring to fig. 2, which is a schematic diagram of the overvoltage simulation of the circuit breaker according to the embodiment of the present invention, when the equation (1) is implemented by using the model ls module in the electromagnetic transient program, an initial value is set, and then the equation is implemented by using the model ls language, the model ls module outputs a dynamic arc resistance value R (1/g), the value is coupled to the circuit through the nonlinear resistor controlled by the TACS to participate in the real-time simulation calculation, and then the electromagnetic transient program outputs the overvoltage at two ends of the circuit breaker contact by using the arc resistor, and the real-time simulation of the circuit breaker voltage is implemented by continuous loop iteration.
And S3, adopting multiple lightning counterattack towers and shielding wires in the simulation model to obtain the lightning overvoltage of the circuit breaker in real time.
In specific implementation, multiple lightning currents are respectively used on a tower top and a shielding failure lead of a line inlet section within 2km of a transformer substation, and induced lightning overvoltage on a circuit breaker in the substation under the condition that the lightning currents are used for shielding failure on different towers and shielding failure leads is observed and recorded. When multiple lightning strikes are found, when the overvoltage of the circuit breaker in the station exceeds the insulation design level, the station can be installed on the outgoing line side of the circuit breaker 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-S34:
and S31, realizing the simulation of multiple thunder by adopting continuous thunder current pulses.
And S32, when multiple lightning counterattack towers are adopted, determining the lightning current amplitude under each counterattack.
When a multi-lightning counterattack tower is adopted, determining the first counterattack lightning current amplitude under multiple lightning, wherein the first counterattack lightning current amplitude is selected according to the system voltage level; and after the first lightning stroke, reducing the subsequent counterattack lightning current amplitude according to a preset proportion at each back attack interval.
Referring to fig. 3, which is a schematic diagram of lightning current amplitude variation under 5-times lightning stroke provided by the embodiment of the present invention, since the lightning current amplitude of multiple lightning strokes of actual multiple lightning is generally smaller than that of the previous lightning stroke, in the embodiment, when counterattack and shielding failure simulation calculation is simulated, the amplitude of the follow-up counterattack current is sequentially decreased according to a proportion of 5%, and the counterattack times n, the counterattack interval t of multiple lightning strokes and the lightning current gradient can be actually selected.
And S33, when multiple lightning shielding wires are adopted, determining the lightning current amplitude under each shielding failure.
When multiple lightning shielding failure is adopted, determining the first shielding failure lightning current amplitude, wherein the first shielding failure lightning current amplitude adopts the maximum shielding failure lightning current which is determined by calculation of a tower electrical geometric model; and after the first shielding failure, reducing the subsequent shielding failure lightning current amplitude according to a preset proportion at each back failure interval.
And S34, acquiring lightning overvoltage on the circuit breaker, which changes along with the lightning current amplitude, in real time according to the lightning current amplitude under each counterattack and the lightning current amplitude under each shielding attack.
Referring to fig. 4, another aspect of the present invention provides a simulation apparatus for circuit breaker overvoltage under multiple lightning strikes, which includes an equipment data obtaining unit 1, a model building unit 2, a voltage obtaining unit 3, and a distance obtaining unit 4.
The equipment data acquisition unit 1 is used for acquiring equipment data in the station; the station equipment data comprises lines, towers, insulator strings, circuit breakers, main equipment electrical plane diagrams in the transformer substation and relevant parameters of the equipment.
The model establishing unit 2 is used for establishing a line-transformer substation lightning intrusion wave simulation model in an electromagnetic transient program according to the station equipment data, wherein the circuit breaker is simulated through a Cassie arc model.
And the voltage acquisition unit 3 is used for acquiring lightning overvoltage of the circuit breaker in real time by adopting multiple lightning counterattack towers and shielding wires in the simulation model.
Specifically, in the model establishing unit 2, when the circuit breaker adopts the Cassie arc model simulation, the Cassie arc model based on the following (1) is firstly adopted:
where U is the arc voltage, g is the arc conductance, i is the arc current, U is gi, U is0(g) For steady state arc voltage, t0(g) Are time constants, and are functions of conductance g.
Referring to fig. 2, which is a schematic diagram of the overvoltage simulation of the circuit breaker according to the embodiment of the present invention, when the equation (1) is implemented by using the model ls module in the electromagnetic transient program, an initial value is set, and then the equation is implemented by using the model ls language, the model ls module outputs a dynamic arc resistance value R (1/g), the value is coupled to the circuit through the nonlinear resistor controlled by the TACS to participate in the real-time simulation calculation, and then the electromagnetic transient program outputs the overvoltage at two ends of the circuit breaker contact by using the arc resistor, and the real-time simulation of the circuit breaker voltage is implemented by continuous loop iteration.
Referring to fig. 5, specifically, the voltage acquisition unit 3 further includes a lightning strike simulation determination subunit 31, an anti-lightning current determination subunit 32, a lightning current around-strike determination subunit 33, and a voltage acquisition subunit 34.
The lightning stroke simulation determining subunit 31 is configured to implement simulation of multiple lightning strokes by using continuous lightning current pulses;
the lightning counterattack current determining subunit 32 is configured to determine a lightning current amplitude under each counterattack when multiple lightning counterattack towers are adopted;
when a multi-lightning counterattack tower is adopted, determining the first counterattack lightning current amplitude under multiple lightning, wherein the first counterattack lightning current amplitude is selected according to the system voltage level; and after the first lightning stroke, reducing the subsequent counterattack lightning current amplitude according to a preset proportion at each back attack interval.
Referring to fig. 3, which is a schematic diagram of lightning current amplitude variation under 5-lightning strike provided by the embodiment of the present invention, since lightning current assignment of multiple lightning strikes of actual multiple lightning is generally smaller than that of the previous lightning strike, in the embodiment, when counterattack and shielding failure simulation calculation is simulated, the amplitude of the post-follow-up counterattack current is sequentially decreased according to a proportion of 5%, and the counterattack times n, the counterattack interval t of multiple lightning strikes, and the lightning current gradient can be actually selected.
The lightning current-around determining subunit 33 is configured to determine a lightning current amplitude under each lightning strike when multiple lightning strike wires are used.
When multiple lightning shielding faults are adopted, determining the first shielding fault current amplitude, wherein the first shielding fault current amplitude adopts the maximum shielding fault current, and the maximum shielding fault current is calculated and determined in a tower electrical geometric model; and after the first shielding failure, reducing the subsequent shielding failure lightning current amplitude according to a preset proportion at each back failure interval.
And the voltage acquisition subunit is used for acquiring lightning overvoltage which changes along with the lightning current amplitude on the circuit breaker in real time according to the lightning current amplitude under each back-strike and the lightning current amplitude under each shielding strike.
The invention provides a method and a device for detecting overvoltage of a breaker under multiple lightning strikes, which have the following remarkable effects:
the invention provides a method and a device for detecting the overvoltage of a circuit breaker under multiple lightning strikes, which are characterized in that a Cassie arc model is introduced to simulate the circuit breaker in the process of establishing a simulation model in an electromagnetic transient program, so that the establishment of a dynamic arc model of the circuit breaker is realized, the opening and closing 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, which is equivalent to the closed operation of the circuit breaker; when the arc current is very small, the resistance is very large, which is equivalent to the open-circuit operation of the circuit breaker, and the problem that the overvoltage of the circuit breaker under multiple lightning strokes is difficult to simulate in real time is solved; meanwhile, the overvoltage level of the circuit breaker under the maximum shielding failure current is considered when the simulation of the induced lightning overvoltage of the circuit breaker is realized, the problem that the overvoltage simulation result is inaccurate due to the fact that only the induced lightning overvoltage of the circuit breaker under the counterattack condition is considered in the prior art is solved, and the overvoltage simulation result 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, when the preset insulation damage level of the circuit breaker is reached, the lightning arrester is configured on the wire outlet side of the circuit breaker, and the safety of a power station system is further guaranteed.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A method for detecting overvoltage of a circuit breaker under multiple lightning strikes is characterized by comprising the following steps:
collecting equipment data in a station; the station equipment data comprises lines, towers, insulator strings, circuit breakers, main equipment electrical plane diagrams in the transformer substation and relevant parameters of equipment;
establishing a line-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 multiple lightning counterattack towers and shielding wires are adopted in the simulation model, so that the lightning overvoltage of the circuit breaker is obtained in real time.
2. The method for detecting the overvoltage of the circuit breaker under multiple lightning strikes according to claim 1, wherein the establishing of a line-substation lightning intrusion wave simulation model in an electromagnetic transient program according to the in-station device data specifically comprises:
adopting a JMarti frequency correlation model to establish a line model, adopting a multi-wave impedance model to establish a tower model, adopting a pilot development model to establish an insulator string model, adopting a nonlinear resistance model to establish a tower ground resistance model, adopting a wave impedance model to establish a station internal connection wire, adopting a Cassie arc model to simulate a circuit breaker and equipment such as an inlet capacitance equivalent simulation isolating switch and a current transformer;
and (4) establishing a line-transformer substation lightning invasion wave simulation model by combining the model and the equipment.
3. The method for detecting the overvoltage of the circuit breaker under multiple lightning strikes according to claim 1, wherein the circuit breaker is simulated by a Cassie arc model, and the method specifically comprises the following steps:
the Cassie arc model was established by the following model:
wherein U is the arc voltage, g is the arc conductance, i is the arc current, U is the arc voltage0(g) For steady state arc voltage, t0(g) Is a time constant, U0(g) And t0(g) Are all functions of conductance g.
4. The method for detecting the overvoltage of the circuit breaker under multiple lightning strikes according to claim 1, wherein the multiple lightning counterattack towers and shielding wires are adopted in the simulation model to obtain the overvoltage of the circuit breaker in real time, and the method specifically comprises the following steps:
the simulation of multiple mines is realized by adopting continuous lightning current pulses;
when multiple lightning counterattack towers are adopted, the lightning current amplitude under each counterattack is determined;
when multiple lightning shielding wires are adopted, determining the lightning current amplitude under each shielding failure;
and acquiring lightning overvoltage on the circuit breaker, which changes along with the lightning current amplitude, in real time according to the lightning current amplitude under each counterattack and the lightning current amplitude under each shielding attack.
5. The method for detecting the overvoltage of the circuit breaker under multiple lightning strikes according to claim 1, wherein the establishing of the line-substation lightning intrusion wave simulation model in the electromagnetic transient program according to the in-station device data further comprises:
when the simulation model is established, the circuit breaker overvoltage simulation model considering the influence of power frequency voltage and induced lightning voltage is calculated by the following formula:
wherein u is induced lightning voltage, i is lightning current amplitude, hcIs the average height of the wire, hgAnd k is the ground wire average height, and the coupling coefficient of the ground wire is shown as k.
6. The method for detecting the overvoltage of the circuit breaker under multiple lightning strikes according to claim 4, wherein when multiple lightning strikes on a tower, the determining of the lightning current amplitude under each strike specifically comprises:
when a multi-lightning counterattack tower is adopted, determining the first counterattack lightning current amplitude under multiple lightning, wherein the first counterattack lightning current amplitude is selected according to the system voltage level;
and after the first lightning stroke, reducing the subsequent counterattack lightning current amplitude according to a preset proportion at each back attack interval.
7. The method for detecting the overvoltage of the circuit breaker under multiple lightning strikes according to claim 4, wherein when multiple lightning shielding wires are adopted, the determining the lightning current amplitude under each shielding strike specifically comprises:
when multiple lightning shielding failure is adopted, determining the first shielding failure lightning current amplitude, wherein the first shielding failure lightning current amplitude adopts the maximum shielding failure lightning current which is determined by calculation of a tower electrical geometric model;
and after the first shielding failure, reducing the subsequent shielding failure lightning current amplitude according to a preset proportion at each back failure interval.
8. A detection device for breaker overvoltage under multiple lightning strikes is characterized by comprising:
the equipment data acquisition unit is used for acquiring equipment data in the station; the station equipment data comprises lines, towers, insulator strings, circuit breakers, main equipment electrical plane diagrams in the transformer substation and relevant parameters of equipment;
the model establishing unit is used for 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 the voltage acquisition unit is used for acquiring the lightning overvoltage of the circuit breaker in real time by adopting multiple lightning counterattack towers and shielding wires in the simulation model.
9. The apparatus for protecting against circuit breaker overvoltage under multiple lightning strikes of claim 8, wherein said voltage acquisition unit further comprises:
the lightning stroke simulation determining subunit is used for realizing the simulation of multiple lightning by adopting continuous lightning current pulses;
the lightning strike-back current determining subunit is used for determining the lightning current amplitude under each strike-back when multiple lightning strikes the tower;
the lightning current of shielding failure confirms the subunit, is used for while adopting the wire of multiple lightning shielding failure, confirm the magnitude of lightning current under each shielding failure;
and the voltage acquisition subunit is used for acquiring lightning overvoltage which changes along with the lightning current amplitude on the circuit breaker in real time according to the lightning current amplitude under each back-strike and the lightning current amplitude under each shielding strike.
10. The apparatus for protecting the circuit breaker against the overvoltage under multiple lightning strikes as claimed in claim 9, wherein in said model building unit, said circuit breaker is simulated by a Cassie arc model, specifically comprising:
the Cassie arc model was established by the following model:
wherein U is the arc voltage, g is the arc conductance, i is the arc current, U is the arc voltage0(g) For steady state arc voltage, t0(g) Is a time constant, U0(g) And t0(g) Are all functions of conductance g.
Priority Applications (1)
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| CN113326613A (en) * | 2021-05-25 | 2021-08-31 | 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 |
| CN113447768A (en) * | 2021-05-25 | 2021-09-28 | 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 |
| CN113572143A (en) * | 2021-09-26 | 2021-10-29 | 广东电网有限责任公司 | Lightning protection method and device for power transmission line under multiple lightning strikes |
| 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 |
| 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 |
| CN115098899A (en) * | 2022-06-17 | 2022-09-23 | 华中科技大学 | Multi-lightning 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 |
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| 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 |
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| CN113447768A (en) * | 2021-05-25 | 2021-09-28 | 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 |
| 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 |
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| CN115098899A (en) * | 2022-06-17 | 2022-09-23 | 华中科技大学 | Multi-lightning 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 |
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