Current transformer simulation load box

Abstract

The invention relates to a current transformer simulation load box, wherein wiring end buttons K, 5A and 1A are respectively in connection with L1, L2, and L3 ends of the input winding of a current transformer Z1; K1 and K2 ends of the output winding of Z1 are respectively connected with input ends P1 and P2 of a microcomputer voltage phase shifter QY; output ends Q1 and Q2 of the microcomputer voltage phase shifter QY are respectively connected with C0 and C1 ends of the input winding of a voltage transformer Z2; total 14 windings comprising d0D0, d1D1, ..., and d13D13 of the binary output winding of Z2 are arranged in order, D0 is connected with d1 or D1 through a relay J1, ..., D12 is connected with d13 or D13 through a relay J13, and D13 is connected with a wiring end button D; and Z end button is connected with d0 or D0 through a relay J0. The invention can ensure that the current transformer with secondary current of 5A and 1A can obtain a power factor of any value between 0 and 1.

Description

technical field [0001] The invention belongs to a transformer simulation load box, in particular to a current transformer simulation load box. Background technique [0002] When measuring the transformer, the specified load must be added to the secondary of the tested transformer. For this reason, current load boxes with different rated currents, load impedances and power factors are specially produced. Although there are currently such current load boxes, such as the FYF1 simulation current load box produced by Shanxi Electromechanical Design and Research Institute, this current load box is connected with a resistor on the transformer, which can only measure power factors of 0.8 and 1. If you want to measure the power factor of other values, you need to manufacture the current load box separately, which cannot meet the needs of measuring other special power factors. Contents of the invention [0003] The technical problem to be solved by the present invention is to provi...

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Problems solved by technology

Although there are currently such current load boxes, such as the FYF1 simulation current load box produced by Shanxi Electromechanical Design and Research Institute, this current load box is connected with a resistor on the transformer, which can only measure power factors of 0.8 and 1. If you want to measure the power factor of other values, you need to manufacture the current load box separately, which cannot meet the needs of measuring other special power factors

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