Title :
New protection method for HVDC lines including cables
Author :
Takeda, H. ; Ayakawa, H. ; Tsumenaga, M. ; Sanpei, M.
Author_Institution :
Toshiba Corp., Tokyo, Japan
fDate :
10/1/1995 12:00:00 AM
Abstract :
For the third project of the Hokkaido-Honshu HVDC Link in Japan, called the HVDC Link III project (rated at 250 kVDC-1200 A-300 MW), we developed an HVDC transmission line protection method based on a new working principle that allows high-speed and highly sensitive detection of faults, enhancing reliability in the supply of electric power. In general, increasing the sensitivity of relays will lead to an increased likelihood of undesired operation whereas lowering the sensitivity will impair the responsiveness of the relays. Our proposed method meets these apparently incompatible requirements very well. Basically classified as a differential scheme, the HVDC transmission line protection method compensates for a charging and discharging current that flows through the line-to-ground capacitance at times of voltage variations caused by a line fault or by the operation of DC power systems. The developed protection method is also characterized in that it uses current changes induced by voltage variations to restrain the operation of a relay. This configuration has made the proposed method far superior in responsiveness and sensitivity to the conventional protection method. A simulation using an EMTP (Electro-Magnetic Transients Program) was conducted on this method. Developed relay equipment embodying the new protection method was subjected to various verification tests, where this equipment was connected to a power system simulator, before being delivered to the HVDC Link III facility
Keywords :
HVDC power transmission; capacitance; digital simulation; power cables; power system analysis computing; power system protection; relay protection; 1200 A; 250 kV; 300 MW; DC power systems; EMTP simulation; Electro-Magnetic Transients Program; HVDC Link III project; HVDC lines protection; Hokkaido-Honshu HVDC Link; Japan; charging current; discharging current; highly sensitive fault detection; line-to-ground capacitance; relay equipment; reliability; transmission line protection; Cables; Delay; Electrical fault detection; HVDC transmission; Power system protection; Power system relaying; Power system simulation; Power system transients; Protective relaying; Voltage;
Journal_Title :
Power Delivery, IEEE Transactions on