Ratio Analysis CT (Current Transformers) in Indirect Measurement Systems for Installed Power
Sriwati, Agus Siswanto

1 Electrical Engineering Study Program, Universitas Islam Makassar, Jln. Perintis Kemerdekaan Km.10 Makassar 90245, Indonesia
2 Electrical Engineering Study Program, Faculty of Engineering, Universitas 17 Agustus 1945 Cirebon, Indonesia

Abstract

Distribution of electric power systems to consumers through various processes, namely generation, transmission and distribution of electricity. Large power customers will certainly flow (currents) large electricity anyway, therefore kWh (kilowatt-hour) meters require CT (current transformers). CT is a measurement tool that functions to transform large load currents into small currents according to the ratio so that it can be read by a kWh meter using an indirect measurement system. Indirect measurement is a measurement that requires tools. CT ratio error caused by saturation of CT and discrepancy of CT value attached with the CT value following the customers contracting power results in losses at PT. PLN (Persero), which affects the kWh meter as an indicator of billing because it reduces the cost of consumer electricity bills. To reduce these losses, it is necessary to calculate the CT ratio to the customer so that PT. PLN (Persero) did not experience a loss. The average loss ratio of installed CT is 373,6748 kWh. Examination of the CT ratio of large customers of 41.5-197 kVA (as many as +/- 100 customers) found 14 CT findings on 10 customers who have a CT current error limit of <-5%. The nominal value of kWh loss per month due to the CT saturation ratio is 3094.08 kWh.

Keywords: CT, Indirect Measurement Systems, errors, losses, ratios

Topic: Electrical Engineering