What Is Loop Electrical Excision Procedure?

The main function of the voltage forming circuit is the conversion of electricity. To obtain current and voltage information from the current transformers and voltage transformers of the protected power line, the microcomputer protection must further reduce the secondary current and voltage (5A or 1A, 100V) of these current transformers and voltage transformers to ± 5V or ± 10V range of voltage signal, used for microcomputer-protected analog-to-digital conversion chip.

It is very common for voltage to form a loop, and the following two are common.
(I) Voltage protection circuit for current protection. Current protection is the most widely used protection device. It is a protection device that reflects the magnitude of the current inside the protected element. protection. If the internal current of the protected element exceeds a preset value, the protection device will act, trip after a preset time, and cut off the power to achieve the purpose of protection. So it can be used as a power grid,

(1) The voltage of the input voltage forms a loop

The secondary rated 100V voltage output from the primary voltage transformer is converted into a maximum ± 5V analog voltage signal for use by the analog-to-digital conversion chip.

Can be realized by voltage converter.

(2) The voltage of the input current forms a loop

The secondary rated 5A / 1A current output by the primary current transformer is converted into a maximum ± 5V analog voltage signal for use by the analog-to-digital conversion chip.

It can be realized by current converter or reactance converter.