MBS current transformer principle
MBS current transformer
MBS current transformer is made by using the ratio of the primary and secondary current of the transformer. Its working principle and equivalent circuit are also the same as general transformers, except that the primary winding is connected in series with the circuit under test and the number of turns is small; the secondary winding is connected to a low-impedance load such as an ammeter and a relay current coil, which is approximately short-circuited. The primary current (ie the measured current) and the secondary current depend on the load of the circuit under test, and are not related to the secondary load of the current transformer. Because the secondary side is close to a short circuit, the primary and secondary side voltages U 1 and S are small, and the excitation current I 0 is also small.
When the MBS current transformer is running, the secondary side is not allowed to open. Because once the circuit is open, the primary current becomes the excitation current, which makes the magnetic flux and the secondary voltage greatly exceed normal values, and endangers people and equipment. Therefore, fuses are not allowed in the secondary circuit of the current transformer, and it is not allowed to remove the ammeter, relay and other equipment without bypass during operation.
MBS current transformer wiring mode is determined according to the operating requirements of the load connected to it. * Common wiring methods are single-phase, three-phase star and incomplete star (Figure 4a, b, c).
Rated transformation ratio and rated transformation ratio of error transformer KN refers to the rated voltage ratio of the voltage transformer and the rated current ratio of the current transformer. The former is defined as the ratio of the rated voltage U 1N of the primary winding to the rated voltage U 2N of the secondary winding; the latter is the ratio of the rated current I 1N to I 2N. which is
KN = U 1N / U 2N.
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