Working Principle of Current Quick Break Protection_ Current Quick Break Protection Range

Working principle of current quick break protection

Current quick break protection, as the name suggests, refers to the current protection that acts instantaneously when the current changes or exceeds the preset protection setting range. The written definition is: the current protection that acts instantaneously in response to the increase of short-circuit current amplitude is called current quick break protection. In order to ensure the selectivity of its microcomputer protection device, it can only protect one circuit of the line. It is assumed that the current quick break protection is installed on the line every day. In case of fault on the line, it is expected that the protection can act instantaneously, It is better that its protection range can reach 100% of the length of the line, but whether this wish can be realized needs to be analyzed in detail.

In order to solve this contradiction, there are two methods. Usually, priority is given to ensuring the selectivity of action, that is, from the setting of the starting parameters of the protection device to ensure that it will not be started in case of short circuit at the outlet of the next line. In microcomputer protection technology, this is also called setting according to the condition of avoiding the short circuit at the outlet of the next line. The other method is in individual cases, When fast fault removal is the primary condition, automatic reclosing is used to correct this non selective action.

When the electrical equipment in the power grid fails, the short-circuit current is very large. According to the basic action principle of the relay, if the short-circuit current is set as the action current of the relay through calculation in advance, the faulty equipment can be protected. Overcurrent protection and current quick break protection are realized according to this principle. In order to ensure the selectivity of action, according to the characteristics of short-circuit current (the closer the fault point is to the power supply, the greater the short-circuit current), overcurrent protection has action time limit, while current quick break protection does not have action time limit, that is, when a short circuit occurs, it acts immediately to cut off the fault, so it has no time limit characteristics and is often used in combination with overcurrent protection.

Quick break protection can not protect the whole length of the line, but can only selectively protect part of the line, and the rest is the dead zone of quick break protection. In order to avoid the above situation, the quick break protection can also be made with slight time limit, which is called time limit current quick break protection. It cooperates with the indefinite current quick break to eliminate action dead zone of the current quick break protection.

Setting principle of current quick break protection

Current quick break protection is a current protection device with no time limit or very short time limit action. It should ensure that the short-circuit fault point can be removed quickly in the shortest time, reduce the duration of the accident and prevent the expansion of the accident.

The setting principle of current quick break protection is that the action current of the protection is greater than the short-circuit current of three-phase metal short circuit at the end of the protected line. For the transformer, the setting current is greater than the short-circuit current of the three-phase metal short circuit of the secondary outlet of the protected transformer.

The reason why the setting principle is so determined is that the indefinite current protection only protects the most dangerous faults. The closer to the power supply, the greater the short-circuit current, the more dangerous it is.

Current quick break protection range

Current quick break protection can not protect the whole length of the line, only about 70% 8006 of the whole length of the line, and can not protect 20% - 30% near the end of the line; For the transformer, it can not protect all of the transformer, but can only protect the phase to phase short circuit fault from the leads and cables on the high-voltage side of the transformer to some windings of the transformer (mainly high-voltage windings). In short, quick break protection has dead zone, and overcurrent protection is often used as the backup of quick break protection.

Working Principle of Current Quick Break Protection_ Current Quick Break Protection Range 1

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