Summary
HVDC circuit-breakers (DC-CBs) are used in a multi-terminal high-voltage DC (MT-HVDC) transmission systems to isolate faulted sections from healthy ones. The development of a 550 kV voltage source converter assisted resonant current (VARC) DC circuit-breaker (DCCB) is in progress. A DC-CB typically consists of a current suppression device (CSD) that can suppress the fault current to zero and a residual current switch (RCS) that can interrupt the residual current. The VARC CSD consists of multiple units connected in series, with each unit generating a TIV of approximately 50 kV. By changing the number of units connected in series, the rated voltage and the maximum amount of energy can be changed.
Read more Read lessIn the IEC TS 62271-313, unit test for the breaking test is acceptable if it can reproduce stresses which are equal to or higher than when a breaker is tested as whole. In the case of the VARC
CSD, the testing of three units can be sufficient to verify the breaking performance, both electrically and mechanically.
A rapid-auto reclosing test is required as part of the breaking tests and the testing method was developed using an AC short-circuit generator. This was implemented by adding an auxiliary switch to the single breaking test circuit and adjusting the operating timing of each switch.
Based on these studies, tests were conducted on three units VARC CSD prototype. It has successfully interrupted the rated current of 12.5 kA consecutively in both polarities, thereby verifying the effectiveness of the developed testing method. This study is expected to contribute to future standardization.
Additional informations
| Publication type | Session Materials |
|---|---|
| Reference | A3_10765_2026 |
| Publication year | |
| Publisher | CIGRE |
| Country | Japan |
| Study committees | |
| File size | 1 MB |
| Price for non member | 30 € |
| Price for member | 30 € |
Authors
INAGAKI Takashi - Mitsubishi Electric Corporation Japan; AKAHOSHI Takao - Mitsubishi Electric Corporation Japan; MANOHAR Rutvika - Mitsubishi Electric Corporation Japan; NEE Simon - Scibreak AB Sweden Sweden; MODEER Tomas - Scibreak AB Sweden Sweden; NORRGA Staffan - Scibreak AB Sweden Sweden
Keywords
High voltage, DC, Circuit breaker, Residual Current, Testing
