Vacuum Interrupters: Design optimisation requires reliable experimental data

Compactness of switchgear can be reached using a shielded solid insulation technology. Thus the size and costs can be reduced and the substation installation becomes easier and more attractive for customers. Constraints are then reported on the design of Vacuum Circuit Breaker in order to fulfill the whole standard requirements. A new embedded Vacuum Interrupter was developed that complies with requirements related to partial discharges, thermal cycles, mechanical endurance, breaking performance and disconnecting dielectric withstand. Multi-physics simulations were widely used to match industrial and technical requirements of such a complex system. For instance, overmolding simulation is mandatory to ensure the material homogeneity, the suitability of stresses with thermal constraints and that there are no holes. Radial Magnetic Field contacts were used to get compactness, cost effectiveness and breaking capacity. Contact material was also selected in order to obtain the best compromise between breaking performance, anti-welding property and low erosion. Thus the E2 electrical endurance class and 50 full interruptions at 25kA/15kV were achieved with less than 0.8mm erosion. No degradation of power frequency dielectric performance across isolating distance was found after breaking tests. Finally, this vacuum interrupter complies with the circuit-breaker and the disconnector standards.

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“…It is actually known that these criteria are linked with the cleaning process of parts or the elaboration process [5].…”

Section: Dielectric Simulation Disconnecting Performancementioning

confidence: 99%

Development of a new vacuum interrupter for disconnecting and breaking in a shielded and solid insulated switchgear

Nicolle

Schellekens

Henon

et al. 2012

2012 25th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV)

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“…In the domestic and international electric power market, the research and development of renewable energy and distributed resources are ongoing [1][2][3][4]. For developing solid insulation high-voltage apparatus such as the Load Break Switch (LBS), Vacuum Circuit Breaker (VCB), and Recloser, a Vacuum Interrupter (VI) is used instead of Sulfur hexafluoride (SF 6 ) gas [5]. Figure 1 shows the application of VI.…”

Section: Introductionmentioning

confidence: 99%

Real-Time Monitoring of the Vacuum Degree Based on the Partial Discharge and an Insulation Supplement Design for a Distribution Class Vacuum Interrupter

Bang

Lee

2021

Energies

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The internal pressure of a vacuum interrupter (VI) is increased by arc heat, ceramic cracking, gas leakage, and manufacturing defects. Accordingly, the dielectric strength of VI rapidly decreases. To improve the reliability of power transmission, efficient maintenance through the real-time monitoring of the vacuum degree is essential. However, real-time monitoring of the vacuum degree is difficult, and related research is scarce. Additionally, due to the insulation problems of this technology, there are few commercially available products. Therefore, this paper proposes a method for real-time monitoring of the vacuum degree and an insulation supplement design for a distribution class VI. First, dielectric experiments were conducted to identify the section in which the dielectric strength of the VI rapidly decreased according to the vacuum degree. Second, for real-time monitoring of the VI, several factors were proposed through the partial discharge in the VI, while the capacitance characteristics of the VI were calculated to improve the signal of the internal partial discharge. Finally, to supplement the dielectric problems of the solid insulation high voltage apparatus that occur when real-time monitoring technology is applied, the insulation supplement design was performed through the finite element method (FEM).

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Diagnosis of Discharge Pattern in Vacuum Interrupter by Shield Potential Measurement

Kojima

Donen

Kojima

et al. 2020

2020 8th International Conference on Condition Monitoring and Diagnosis (CMD)

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Vacuum Interrupters: Design optimisation requires reliable experimental data

Cited by 6 publications

References 9 publications

Development of a new vacuum interrupter for disconnecting and breaking in a shielded and solid insulated switchgear

Development of a new vacuum interrupter for disconnecting and breaking in a shielded and solid insulated switchgear

Real-Time Monitoring of the Vacuum Degree Based on the Partial Discharge and an Insulation Supplement Design for a Distribution Class Vacuum Interrupter

Diagnosis of Discharge Pattern in Vacuum Interrupter by Shield Potential Measurement

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