When a component such as a transmission line, a generator, or a transformer of a power system fails, a short-circuit current is passed through the system, and the closer the fault point is to the power source, the larger the short-circuit current is. In response to this feature, the current relay can be used to easily constitute overcurrent protection and quick-break protection. When the current exceeds the setting value of the protection device, the protection action causes the circuit breaker to trip.
Over-current protection can be divided into time-limited over-current protection and inverse-time over-current protection, which is generally set by avoiding the maximum load. In order to make the over-current and off-current protection of the upper and lower stages, it is set according to the short-circuit current of the protected equipment. Therefore, generally, it has no time limit. The two are often used together as the primary protection of the device and the backup protection of adjacent devices.
The current quick-break protection does not protect the full length of the line (otherwise it will lose selectivity), and there is a dead zone for quick-break protection. Under normal circumstances, the protection range of the quick-break protection can reach 50% of the total length of the line, and it is considered to have a good protection effect. In the minimum operation mode, it can protect 15%~20% of the total length of the line and can be installed.
Overflow of each protection range (quick-break): 20% (in small mode) to 50% of this line (in large mode)
Limited time-break: 50% of the length of the line + the next paragraph
Time-limited overcurrent: the total length of the line + the length of the next section + the distance of a part of the next section: 80% to 90% of the line
Distance 2: The length of the line + the distance of the next section: the length of the line: the length of the line + the length of the next section + the part of the next section of the zero sequence: 80% to 90% of the line
Zero sequence two segments: the full length of the line + part of the next segment of the zero sequence: the full length of the line + the full length of the next paragraph + part of the next paragraph
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