Voltage transformer Precautions

Voltage transformer (PT) and current transformer (CT) is an important electrical power system equipment, which bears the high and low pressure systems and high voltage isolation between the amount of functions to convert low voltage. The wiring is correct or not, the system protection, measurement, monitoring and other equipment

Normal work is extremely important. In the new installation PT,power transformers commissioning or replacement PT, CT secondary cable, using the polarity of the test method test PT, CT wiring is correct, it is already an indispensable protection staff working procedures.
Avoid reverse polarity is to find the transformer input and output of the "dot end of the" specific method is the "point of polarity." This example shows how to point the current transformer polarity. The specific method is the multimeter connected to the output transformer secondary winding,

Multimeter hit the DC voltage profile; Then a battery of negative fixed at a current transformer output wires; reuse batteries positive to "point" of a current transformer input leads, so that the transformer primary mcb circuit breaker will generating a + (positive)

Pulse current; while observing pointer multimeter hands which direction "Offset", if the multimeter's hands shifted from left to right from 0, j namely hands "positive start" to show that you access the "current transformer input "and" Analog Multimeter positive terminal connection

A current transformer secondary output "is the same name as the end, and this connection is called a" positive polarity "or" minus polarity "; if the multimeter's hands shifted from right to left from 0, ie hands" anti-Kai "to show that you access" current transformer input "and" Pointer

Multimeter positive terminal connected to an output terminal of the current transformer secondary "is not the same name as the end, and this connection is called a" reverse polarity "or" plus polarity. "