Mitsubishi: 160 kV high voltage current, cut off within 7 millisec: EC project ‘PROMOTioN’
Mitsubishi Electric: EC Project “PROMOTioN”
Using a prototype of 160kV high-voltage DC circuit breaker (DCCB * 1), a DC current interruption test was conducted.
The test requirement standards established by the EC Research Project (PROMOTioN: HVDC) have been successfully cleared.
In an experiment that reproduced an accident with a peak value of 16 kA (kiloamperes), it succeeded in “cutting off the current within 7 milliseconds”.
International Certification Body: DNV GL / KEMA High Power Laboratory
This test was conducted at the KEMA High Power Laboratory (Netherlands) of DNV GL, an international certification body.
This test result:
We will proceed with product development based on the results of this test.
Improvement of device reliability and cost reduction,
Expansion and continuity of high-voltage DC power transmission network,
Contributes to improved stability.
HVDC transmission: necessity
Long-distance cable transmission is “low cost and lower cost than AC transmission”.
In Europe (especially in the North Sea and the Baltic Sea), it is used as an “effective means for connecting offshore wind power generation facilities to the onshore power grid”.
In recent years, in order to expand, ensure continuity, and improve stability of the DC power grid, there has been a demand for a DC breaker with high reliability and low cost as equipment.
For AC current: Current interruption
The current can be cut off at the periodic current zero point that appears every half cycle.
For DC current: Current interruption
The circuit breaker must forcibly form a current zero point.
Also, in DC power transmission, a converter that converts power between DC and AC is used.
When an accident occurs:
In the event of an accident, it is necessary to cut off the accident current before the converter stops due to a voltage drop.
In other words, “breaker is required to shut off in a few milliseconds”.
Mitsubishi: 160kV high-voltage DC circuit breaker (DCCB)
This time, when an accident current occurs, the current zero point is forcibly formed and the current is cut off in a few milliseconds.
A mechanical DCCB prototype succeeded in cutting off 160kV high-current direct current.
* 1
Direct Current Circuit Breaker
* 2
High Voltage Direct Current In the high voltage direct current and power field, DC1500V is called HVDC.
* 3
Progress On Meshed HVDC Offshore Transmission Networks
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