Circuit breaker tripping moment control method for inhibiting secondary arc current

A technology of circuit breaker tripping and submerged current supply, which is applied in circuit breaker testing, electrical program control, program control in sequence/logic controllers, etc., can solve problems such as power system and electrical equipment impact, reclosing failure, etc., to achieve Improve the success rate, facilitate extinguishing, and suppress the effect of latent supply current

Active Publication Date: 2019-04-12
卫涛
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the secondary arc is not extinguished when reclosing the faulty phase circuit breaker, it will cause reclosing failure
The failure of coincidence will have another impact on the power system and electrical equipment

Method used

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  • Circuit breaker tripping moment control method for inhibiting secondary arc current
  • Circuit breaker tripping moment control method for inhibiting secondary arc current
  • Circuit breaker tripping moment control method for inhibiting secondary arc current

Examples

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Embodiment

[0044] For a certain length of 318km, the double-sided power transmission line with a voltage level of 500kV has carried out the verification of the protection scheme of the present invention, as figure 2 shown. figure 2 In, M side system impedance: Z 1m =6.2+j17.4Ω, Z 0m =24+j15.3Ω; N-side system impedance: Z 1n =26+j37.4Ω, Z 0n =47+j23.4Ω. The line parameters are: R 1 =0.0133326Ω / km, L 1 =0.847mH / km, C 1 =0.013877μF / km, R 0 =0.032164Ω / km, L 0 =2.65mH / km, C 0 = 0.00977875 μF / km. The phase angle difference of the power supply at both ends of the line is 30°.

[0045] Build with PSCAD / EMTDC figure 2 system shown. A phase-to-ground fault occurs in the line in 1s, and the protection action on the N side trips the faulty phase circuit breaker in 1.04s. After the faulty phase circuit breaker is tripped at different tripping times on the M side, the variation of the latent supply current at the fault point is as follows: Figure 3(a) , 3(b) , 4(a), 4(b). Figure 3...

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Abstract

The invention discloses a circuit breaker tripping moment control method for inhibiting a secondary arc current. When a special/super transmission line breaks down, protection is started, then a phaseselection procedure is carried out, when the fault type is a single-phase grounding fault, fault segment judgment and delay are conducted, and whether an outlet should trip or not is judged; and if the outlet is protected, the circuit breaker tripping time is obtained from an intelligent control assembly of a circuit breaker or an online monitoring system, a non-fault phase line voltage phase position is monitored to generate a tripping command at the best moment, thus when the non-fault phase line voltage is 0, a main contact of the circuit breaker is disconnected, and the purpose of inhibiting the secondary arc current is achieved. According to the method, the single-phase reclosing success rate can be increased, safe operation of a system is guaranteed, and additional investment does not need to be increased.

Description

technical field [0001] The invention belongs to the technical field of electric power protection systems, and relates to a method for controlling the tripping time of a circuit breaker for suppressing a submerged supply current. Background technique [0002] Automatic reclosing is widely used on transmission lines. Because it can improve the reliability of power supply and the stability of system operation, and limit the overvoltage of reclosing, single-phase reclosing is usually used on U / EHV transmission lines. When a single-phase ground fault occurs, the protection action trips the faulty phase circuit breaker. Due to the sound electromagnetic coupling with respect to the faulty phase, the fault point will form a secondary arc (that is, the latent supply current). If the secondary arc is not extinguished when the faulty phase circuit breaker is reclosed, the reclosure will fail. The failure of coincidence will have another impact on the power system and electrical equip...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/327G05B19/04
CPCG01R31/327G05B19/04
Inventor 梁振锋张惠智毛逸凡
Owner 卫涛
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