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Method for calculating transient stress of E type lightning arrester

A lightning arrester and stress technology is applied in the field of calculating the transient stress of E-type arresters, which can solve the problems of unfavorable equipment safe operation and low arrester energy, and achieve the effects of improving control protection logic, high safety, and protecting power equipment.

Active Publication Date: 2013-12-25
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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Problems solved by technology

Therefore, the arrester energy calculated by the current modeling method will be smaller than the actual one, which is not conducive to the safe operation of the equipment

Method used

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  • Method for calculating transient stress of E type lightning arrester
  • Method for calculating transient stress of E type lightning arrester
  • Method for calculating transient stress of E type lightning arrester

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Embodiment

[0027] figure 1 is the frame diagram of the DC system in the double-pole operation mode, figure 2 It is the frame diagram of the DC system in the single-pole operation mode. Including converter transformer 1, converter valve 2, ground electrode line 3, DC neutral bus 4, DC high voltage bus 5, DC line 6, smoothing reactor 7, neutral bus voltage divider 8, E-type arrester 9, ground pole open circuit fault point 10, ground pole 1 circuit current transformer 11, ground pole 2 circuit current transformer 12, neutral bus voltage divider 8 for measuring DC voltage, ground pole 1 circuit current transformer The device 11 is used to measure the DC current, and the ground electrode 2 circuit current transformer 12 is used to measure the DC current. Rectifier side a and inverter side b see figure 1 on both sides. The secondary side of the converter transformer 1 is connected to the converter valve 2, the high-voltage side of the converter valve is connected to the smoothing reactor ...

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Abstract

The invention discloses a method for calculating the transient stress of an E type lightning arrester. The method comprises the following steps of (1) determining a protection logic; (2) establishing a high-voltage direct current electromagnetic transient simulation model, and modeling the protection logic; (3) executing EMTDC (electromagnetic transients including DC) electromagnetic transient simulation, observing a measurement signal curve, and verifying whether a grounding electrode open circuit protection action logic meets a requirement or not; (4) recording the maximum energy of the E type lightning arrester under a grounding electrode open circuit failure. According to the method, the shortcoming of excessive idealization of a control protection logic of a conventional calculation model is overcome, and a measurement signal triggering-based control protection logic is adopted, namely sampling filtering and judging links for measuring voltage and current are added as protection triggering bases; in an exit phase shifting protection process, a slope link is added, and a triggering angle is phase-shifted at speed of 4 degrees per millisecond; the control protection logic for the simulation model is improved to be more consistent with an actual running condition; when the method is used for selecting an energy parameter of the E type lightning arrester, higher safety is ensured, and power equipment on a neutral generatrix can be effectively protected.

Description

technical field [0001] The invention is a method for calculating the transient stress of an E-type arrester, which belongs to the innovative technology of the method for calculating the transient stress of the E-type arrester. Background technique [0002] When a transient fault occurs in the power system, overvoltage stress will be generated on the equipment. In order to ensure the safe operation of equipment in the field of DC engineering, a certain number of arresters need to be installed in the system to protect important equipment and discharge fault current. . [0003] The E-type surge arrester is a surge arrester installed on the DC neutral bus, which plays the role of limiting overvoltage and protecting the neutral bus equipment. When selecting the parameters of the E-type arrester, it is necessary to use simulation software to simulate the open-circuit fault of the ground electrode in the DC system and calculate the maximum energy stress of the arrester. The actua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCY02E60/00
Inventor 徐迪臻杨煜黎小林黄莹赵晓斌
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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