CN107391810B - Method for calculating transient rated value of element of grounding electrode lead monitoring device - Google Patents
Method for calculating transient rated value of element of grounding electrode lead monitoring device Download PDFInfo
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- CN107391810B CN107391810B CN201710526454.6A CN201710526454A CN107391810B CN 107391810 B CN107391810 B CN 107391810B CN 201710526454 A CN201710526454 A CN 201710526454A CN 107391810 B CN107391810 B CN 107391810B
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Abstract
The invention discloses a method for calculating a transient rated value of an element of an earth electrode lead monitoring device, which can accurately calculate important parameters such as reference voltage, matching current, residual voltage, energy absorption capacity and the like of a lightning arrester of the earth electrode lead monitoring device, determine the insulation level and impact current data of a capacitor and a reactor in the earth electrode lead monitoring device, prevent the earth electrode lead monitoring device from insulation breakdown accidents caused by overvoltage, avoid the system from detecting faults of an earth electrode line and even stopping the operation of a direct current system, ensure the stable operation of a large-area power grid and provide powerful guarantee for the reliability of a high-voltage direct-current transmission project.
Description
[ technical field ] A method for producing a semiconductor device
The invention belongs to the technical field of high-voltage direct-current power transmission, and relates to a method for calculating a transient rated value of an element of a grounding electrode lead monitoring device.
[ background of the invention ]
A converter station of the high-voltage direct-current transmission system needs to be provided with a certain number of grounding electrode lead monitoring devices (ELIS) for monitoring Impedance change conditions of grounding electrode lines in real time, so that possible faults of the grounding electrode lines under various operating conditions are detected and fault points are positioned, the faults are eliminated as soon as possible, the outage time of the high-voltage direct-current transmission system is shortened, and the availability of the high-voltage direct-current transmission system is improved.
Power system overvoltage is one of the main factors that jeopardize the safe operation of the power system. Once an equipment insulation breakdown accident happens after the direct current transmission system is subjected to overvoltage generated by lightning stroke, operation, fault or other reasons, equipment damage can be caused, even the direct current system is stopped, under a more serious condition, a load center loses large-capacity power supply, stable operation of a large-area power grid is endangered, and the consequence is very serious. In the existing high-voltage direct-current transmission project in China, the transient rating of an element of a grounding electrode lead monitoring device is generally directly given by project experience, which often causes overlarge electrical insulation margin of equipment and certain waste. Therefore, there is a need to find a suitable method for conducting accurate simulation studies on the transient ratings of the earth lead monitoring device components.
[ summary of the invention ]
The present invention is directed to overcoming the above-mentioned disadvantages of the prior art and providing a method for calculating a transient rating of an earth lead monitoring device element for accurate simulation studies of the transient rating of the earth lead monitoring device element.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for calculating the transient rating of an element of a grounding electrode lead monitoring device is characterized in that a simulation model is built on software, and the most severe transient working condition which possibly occurs in the operation of equipment is simulated; the method is characterized in that a model is respectively established for simulating two fault conditions of the earth fault at the earth electrode line side of the blocking filter and the earth fault at the high-voltage end of the capacitor of the injection loop filter, and the transient rated value of the element of the earth electrode lead monitoring device is obtained.
Further, the equipment end of the blocking filter is protected by a neutral bus arrester E against the ground, and the equipment ends are protected by an arrester FL1 connected in parallel to a reactor L1; the reactor L2 of the injection loop filter is protected by a parallel lightning arrester FL2 between ends, the end-to-ground is protected by a lightning arrester FL2 and a lightning arrester FL2D in series, and the capacitor C2 is protected by a neutral bus lightning arrester E.
Further, the parasitic inductance of the capacitor and the parasitic inductance of the connecting leads are considered in calculating the transient ratings of the earth lead monitoring device components.
Furthermore, when the earth fault on the earth electrode line side of the blocking filter is simulated, the neutral bus capacitor needs to be precharged to the maximum direct-current voltage during normal operation, after the earth fault occurs, the capacitor is discharged through the reactor, and the inter-terminal voltage on the element of the blocking filter has short duration and presents a lightning wave characteristic.
Further, the position of the earth fault occurring at the earth fault side of the blocking filter earth electrode circuit during simulation is between the neutral bus blocking filter and the injection loop filter.
Furthermore, when the high-voltage end of the injection loop filter capacitor is in ground fault simulation, the high-voltage capacitor C2 of the injection loop filter needs to be pre-charged to the operation impact protection level of a neutral bus, after the ground fault occurs, the capacitor C2 is discharged through the reactor L2, transient overvoltage is formed between the ends of the reactor, and the transient overvoltage presents lightning wave characteristics.
Compared with the prior art, the method can accurately calculate the important parameters of the reference voltage, the matching current, the residual voltage, the energy absorption capacity and the like of the arrester of the grounding electrode lead monitoring device, determine the insulation level and the impact current data of the capacitor and the reactor in the grounding electrode lead monitoring device, prevent the insulation breakdown accident of the grounding electrode lead monitoring device caused by overvoltage, avoid the fault that a system cannot detect a grounding electrode line and even the shutdown of a direct current system, ensure the stable operation of a large-area power grid, and provide powerful guarantee for the reliability of a high-voltage direct-current transmission project.
[ description of the drawings ]
Fig. 1 is a view showing a configuration of an arrester according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a side-to-ground fault simulation of a blocking filter ground line according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating simulation of high-voltage-end-to-ground faults of a filter capacitor of an injection loop according to an embodiment of the present invention;
[ detailed description ] embodiments
The scheme of the invention is illustrated by the following specific examples:
in order to achieve the above purpose, the technical scheme adopted by the invention is as follows: and (3) building a simulation model on software, and simulating the most severe transient working condition which may occur in the operation of the equipment. Namely, a model is respectively established for simulation analysis of two fault working conditions of the earth fault at the earth electrode line side of the blocking filter and the earth fault at the high-voltage end of the capacitor of the injection loop filter.
Referring to fig. 1, the equipment ends of the blocking filter are protected by a neutral bus arrester E, and the equipment ends are protected by an arrester FL1 connected in parallel to a reactor L1. The reactor L2 of the injection loop filter is protected by a parallel lightning arrester FL2 between ends, the ends are protected by FL2 and FL2D in series, and the capacitor is protected by a neutral bus lightning arrester E.
Two fault conditions, namely blocking filter grounding electrode line side ground fault and injection loop filter capacitor high-voltage end ground fault, need to be considered when calculating and building a simulation model.
As shown in fig. 2, during simulation, the neutral bus capacitor needs to be precharged to the maximum dc voltage during normal operation, after the ground fault occurs, the capacitor is discharged through the reactor, and the inter-terminal voltage on the blocking filter element has a short duration and exhibits a lightning wave characteristic.
As shown in fig. 2, the ground fault on the ground electrode line side of the blocking filter is positioned between the neutral bus blocking filter and the injection loop filter when the ground fault occurs in simulation.
As shown in fig. 3, during simulation of the injection loop filter capacitor high-voltage end-to-ground fault, the injection loop filter high-voltage capacitor C2 needs to be pre-charged to the operation surge protection level (SIPL) of the neutral bus, and after the ground fault occurs, the capacitor C2 is discharged through the reactor L2, so that transient overvoltage is formed between the reactor ends, and the transient overvoltage presents a lightning wave characteristic.
As shown in fig. 3, the ground fault of the high-voltage end of the capacitor of the injection loop filter occurs at the position between the neutral bus blocking filter and the injection loop filter or between the injection loop filter and the ground pole line during simulation.
The parasitic inductance of the capacitor and the stray inductance of the connecting leads are taken into account when calculating the transient rating of the earth lead monitoring device components.
The lightning arrester used in the calculation of the transient rating of the earth lead monitoring device components is represented by a non-linear resistor, the characteristics of which are determined by the volt-ampere characteristics provided by the arrester manufacturer.
The above description is only one embodiment of the present invention, and not all or only one embodiment, and all equivalent modifications to the technical solutions of the present invention are covered by the claims of the present invention.
Claims (2)
1. A method of calculating a transient rating of an earth lead monitoring device component, comprising: establishing a simulation model on software, and simulating the most severe transient working condition which may occur in the operation of equipment; respectively modeling two fault working conditions of a ground fault on the ground side of a grounding electrode line of a blocking filter and a ground fault on the high-voltage side of a capacitor of a current injection loop filter to obtain a transient rated value of an element of a grounding electrode lead monitoring device;
wherein: the blocking filter equipment end is protected by a neutral bus arrester E against the ground, and the equipment ends are protected by an arrester FL1 connected in parallel to a reactor L1; the reactor L2 of the injection loop filter is protected by a parallel lightning arrester FL2 between ends, the ends are protected by a lightning arrester FL2 and a lightning arrester FL2D in series, and the capacitor C2 is protected by a neutral bus lightning arrester E;
when the ground fault of the earth electrode line side of the blocking filter is simulated, a neutral bus capacitor needs to be precharged to the maximum direct current voltage during normal operation, the capacitor discharges through a reactor after the ground fault occurs, and the inter-terminal voltage on an element of the blocking filter has short duration and is in a lightning wave characteristic;
the position of the ground fault occurring when the earth fault on the earth electrode line side of the blocking filter is simulated is between the neutral bus blocking filter and the injection loop filter;
when the high-voltage end of the capacitor of the injection flow loop filter is subjected to ground fault simulation, the high-voltage capacitor C2 of the injection flow loop filter needs to be pre-charged to the operation impact protection level of a neutral bus, and after the ground fault occurs, the capacitor C2 is discharged through the reactor L2, so that transient overvoltage is formed between the ends of the reactor, and the transient overvoltage presents a lightning wave characteristic.
2. The method of calculating a ground lead monitoring device component transient rating of claim 1, wherein: the parasitic inductance of the capacitor and the stray inductance of the connecting leads are taken into account when calculating the transient rating of the earth lead monitoring device components.
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| CN113515838A (en) * | 2021-04-09 | 2021-10-19 | 中国南方电网有限责任公司超高压输电公司梧州局 | Direct current system modeling simulation method and device, computer equipment and storage medium |
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