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Capacitor de-energization provides a high level of transient recovery voltage to vacuum switches as peak positive or negative voltage is trapped on the capacitor just following current interruption. Restrike - Is defined as the re-ignition of load current following current interruption within a vacuum switch.
The arc develops rapidly during fracture, and it is prone to restrike. Meanwhile, rough statistics were performed on the duration of restrike. As the current-limiting resistance value decreases, the duration of restrike is also extended, which is unfavourable for the working conditions of vacuum circuit breaker.
The restrike characteristics under different operating conditions reflect different defects inside vacuum circuit breaker . According to data from Shaoxing Test Station, the current restrike rate of 12 kV vacuum circuit breaker is about 2% to 4%, which can be reduced to less than 1% after practice.
The restrike process of the vacuum circuit breaker includes the development, formation, maintenance, and dissipation of the electron beam, and it is subject to factors such as contact spacing, loop current, and closing inrush current before breaking.
Arrester energy during a capacitor switch restrike event is dependent on the capacitor configuration, ratings, source strength (including nearby capacitors and number of transmission lines), and arrester protective level (e.g., maximum switching surge protective level – MSSPL).
The restrike can result in capacitor and system transient over-voltages of 3, 5, 7, and even 9 per unit system line-to-neutral voltage. Figure two shows a typical case rupture caused by vacuum switch re-strike. In this particular restrike case, five capacitors cans ruptured as shown.
The results indicate that the 40.5kV self-energy SF6 circuit breaker can meet the requirements of power system to switch capacitor group. The polarity effect is existed in slightly uneven electric …
When the filter current crosses zero, the discharge arc of the breaker extinguishes and the restrike ends. As the capacitors and reactors of BP11 and BP13 have …
The new IEC 62271-100 requires an extensive proof of the capability of capacitive switching for a breaker under test. For vacuum circuit breakers, dielectric pr
lem, the vacuum breaker aging test method and the restrike characteristics are researched. A withstand voltage test platform of 40.5-kV vacuum circuit breaker was established to obtain the …
Restrike - Is defined as the re-ignition of load current following current interruption within a vacuum switch. It occurs during the switch interruption process when the parting contacts of a …
Based on the photoelectric test system, Chen Yong conducted research and analysis on the arc voltage drop phenomenon in the process of breaking capacitance current …
In their experiment they connect a capacitor bank with a high peak making current and they measure the energy in the prestrike arc. They then plot the restrike frequency as a function of the energy of prestrike arc; see Figure 5.52.
Based on the photoelectric test system, Chen Yong conducted research and analysis on the arc voltage drop phenomenon in the process of breaking capacitance current of low-voltage current limiting circuit breaker, …
extinguished arc reignites ("restrikes"). The restrike can result in capacitor and system transient over-voltages of 3, 5, 7, and even 9 per unit system line-to-neutral voltage.
The results indicate that the 40.5kV self-energy SF6 circuit breaker can meet the requirements of power system to switch capacitor group. The polarity effect is existed in slightly uneven electric …
In a single-phase test circuit, the restrike current can be measured or, resulting in oscillation current in parts of the main circuit is not always easy to measure but can be detected by its …
The objective of this paper is to investigate back-to-back capacitor switching restrike characteristics of vacuum interrupters (VIs) after conditioning by using a series of high …
probability of restrike, and class C2 having very low probability of restrike. The test duty applied for a class C2 breaker does not allow a single restrike during the whole test series. The test …
This case study presents methods for determining transient overvoltage and arrester duties and during capacitor switch restrike events and sample simulation and field measurements of restrike waveforms.
The arc durations of phase‐A Restrike of the test sample were 8.0, 9.0, and 9.5 ms in turn, which showed an increasing trend but a small difference. Therefore, when the …
Interpretation of NSDD and Restrike in Capacitive Current Switching Test on Medium Voltage Vacuum Circuit Breaker G. Venkateswarlu *, Yugal Agarwal, M. S. Takkher, M. K. Wadhwani …
In their experiment they connect a capacitor bank with a high peak making current and they measure the energy in the prestrike arc. They then plot the restrike frequency as a function of …
CAPACITOR BANK RESTRIKE EVENTS. A capacitor switching device de-energizes a capacitor bank at a current zero (refer to Figure 1). Since the current is capacitive, …
The new IEC 62271-100 requires an extensive proof of the capability of capacitive switching for a breaker under test. For vacuum circuit breakers, dielectric pr
when an arc is established between approaching contacts - damage to circuit breakers (andor capacitors) is a risk. For SF6 breakers, the sudden release of energy may da- mage the …
1 Introduction. Single-phase auto-reclosing (SPAR) is widely used in ultra high voltage (UHV) transmission lines to improve the transient stability of power systems [].After a …
24 Close-open 1B isolated capacitor bank or cable switching @ 100% of rated cap switching 24 Open 2A back-to-back capacitor bank or cable switching @ 30% of rated ... C1 if the breaker …
The experimental circuit is a kind of synthetic test circuit which is the traditional and economical test circuit to modify the capacitor banks switching in field test [11]. Fig. 2 shows a ...