Current transformers play an important role in an electrical system. They convert the high current flowing in the main conductor to a lower and safer level for instrumentation and monitoring devices. It is important to check their accuracy. If a CT is defective, the metering devices may record wrong readings or the monitoring device like a protective relay may not trip in case of an electrical fault.
To help assess the accuracy of current transformers, consider getting the Vanguard EZCT-10 10 Ampere Automatic CT Test Set. This devices can conduct winding, polarity, excitation and current-ratio tests. It also has an automated system that sets the test voltage after selecting the proper excitation test. The ratio and excitation knee point is automatically calculated and charted.This helps save time and effort from fiddling around with the device. You can operate this test set as a stand-alone unit or connect it to a computer through USB or RS232 ports.. It also has an onboard printer so you can print out the results after diagnostics.