10kv电流互感器变比的选择（Selection of ratio of 10kV current transformer）.docVIP

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10kv电流互感器变比的选择（Selection of ratio of 10kV current transformer）.doc

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10kv电流互感器变比的选择（Selection of ratio of 10kV current transformer）

10kv电流互感器变比的选择（Selection of ratio of 10kV current transformer） Selection of ratio of 10kV current transformer The design process in the 10kV distribution in the ratio of 10kV current transformer selection is very important, if the choice is undeserved, it is likely to cause the relay protection function can not be achieved, not through the test of dynamic stability problems, sufficient attention should be paid to the design personnel. 10kV current transformers can be divided into two kinds according to their use, one for relay protection and the other for measurement. They are located in the distribution line, metering, outgoing line and liaison cabinet. In the design practice, the author found that in the distribution transformer substation design, the choice of the current transformer ratio is too small. For example, the author has found that: the station of transformer in a 630kVA (a 10kV rated current is 36.4A) in a power supply loop, the distribution of the outgoing cabinet within the current transformer ratio is only 50/5 (using the GL type DC current relay, this will cause the current operation), relay without setting a series of law the problem. The ratio of 10kV with the selection of current transformer relay protection, at least according to the following conditions: one is to choose a side for calculating the current current transformer rated primary current ratio; according to the requirements of relay protection; three for the calculation of current transformer secondary current is less than MJS times the number of current transformer according to the four times of MB1 saturation; thermal stability; dynamic stability for five. For 10kV current transformer for measurement, because it is used as a measurement of normal working conditions, so the second and third requirements; here in common distribution transformer as an example, shows the influence of above factors on the selection of 10kV current transformer, and find out the main factors influencing th