| 摘要 |
To determine system variables such as power, direction of power flow and/or power factor in direct-current and/or alternating-current systems having arbitrary current shapes, voltage and current transformers are used which operate in accordance with the compensation principle and the secondary compensation currents (I1, I2) of which are the accurate equivalent of the primary current (IN, IV) which, however, is reduced in accordance with the transformation ratio. The compensation currents (I1, I2) are first conducted via in each case one separate resistor (R1, R2) and then via a common resistor (R3). The currents (I1, I2, I3) flowing in the three resistors (R1, R2, R3) are measured in a device (4), evaluated and indicated. <IMAGE>
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