简答题Accurate level of voltage transformer is ( ) to represent it. A、Voltage error and phase difference B、Phase Angle error C、The frequency error D、Secondary impedance简答题The smaller the actual current is compared with the rated current, the higher the measurement accuracy is. A、正确 B、错误简答题The accuracy grade of voltage transformer is (). A、0.2 B、0.5 C、1 D、3简答题The common point where the voltage transformer is connected to the star winding in the power system is called the neutral point of the power system. A、正确 B、错误简答题In order to prevent secondary short circuit of ct, fuse should be installed in secondary circuit. A、正确 B、错误简答题The current transformer must be enabled ( ) in operation. A、Iron core and secondary winding firmly grounded B、 Iron core two point grounding C、 The secondary winding is not grounded D、 Multi-point grounding of iron core简答题The electromagnetic voltage transformer in operation is equivalent to no-load operation. A、正确 B、错误简答题Voltage transformer secondary short circuit will make a ( ). A、Voltage increase B、Voltage reduction C、 Fuse to fuse D、The voltage is constant简答题When the ratio error of current transformer exceeds 10%, the correct action of relay protection will be affected. A、正确 B、错误简答题The primary winding and secondary winding of current transformer in our country are wound by adding polarity. A、正确 B、错误简答题The error of transformer has nothing to do with secondary load. A、正确 B、错误简答题The literal symbol TV stands for ( ). A、Voltage transformer B、Current transformer C、Transformer D、 The generator简答题The current transformer shall operate in () mode. A、The current transformer shall not operate in excess of the fixed capacity for a long time B、 The secondary circuit of the ct should always be closed C、One side of the secondary coil of the ct and the iron core should be grounded at the same time D、 The secondary coil of ct should be able to withstand high voltage简答题The standard accuracy levels of current transformers are (). A、0.1 B、0.2 C、0.3 D、0.4简答题The secondary rated current of the CT is generally ( ) A. A、10 B、100 C、5 D、0.5简答题Factors affecting the error of electromagnetic current transformer include () A、The size of the primary current B、Core quality C、 Structure size D、Secondary side load简答题The load of the ct is related to the load on the primary circuit. A、正确 B、错误简答题One, two, three side of voltage transformer, ( ) need to be grounded. A、A side B、 Secondary side C、 Three side D、 Second and third side