| 摘要 |
<p>PURPOSE:To make a production and stock management of a current transformer reasonable and contract the manufacturing term of a distribution gear and contribute to the saving of resources, by using the same current transformer regardless of the largeness of load equipments, and by eliminating a level converting auxiliary current transformer, in a protective instrumentation system. CONSTITUTION:In a protective instrumentation system, a voltage output type current transformer 3 is provided wherein its secondary current I2 is subjected to a small energization of the transformation into the current adapted to the use of an electronic circuit and a resistor R for converting a current into a voltage is integrated. Further, in the system, an electronic type protective instrumentation device 5 is provided which has a voltage amplifying part 8 for amplifying a terminal voltage V2 of the resistor R using it as an input and has a gain setting part 10 for so setting the gain of the device 5 that an output voltage 9 of the voltage amplifying part 8 can be changed into respective full-scale voltages correspondingly to a plurality of rated values of the different current flowing through the primary side winding of the voltage output type current transformer 3.</p> |
