An anti-power theft method for secondary circuit of energy meter current transformer

2017 ◽  
Author(s):  
Sitao Li ◽  
Haibo Yu ◽  
Helong Li ◽  
Jinquan Zhao ◽  
Jianzhi Liu ◽  
...  
Keyword(s):  
Current Transformer ◽  
Secondary Circuit ◽  
Energy Meter

scholarly journals Design and Development of a Power Quality Based Digital Energy Meter

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Malaika Imran ◽  
Muhammad Shoaib Saleem ◽  
Aun Haider ◽  
Zain Iftikhar
Keyword(s):  
Power Quality ◽  
Power Factor ◽  
Power Distribution ◽  
Distribution Systems ◽  
Quality Measurement ◽  
Current Transformer ◽  
Cloud Data ◽  
Utility Company ◽  
Energy Meter ◽  
Standard Value

In power distribution systems of many countries, service lines are directly connected to the consumer meters without any load management system. Conventional meters lack in internal power quality measurement, and utility also cannot measure the power factor and other values during the month. This study aims to design a smart kit that aids conventional single-phase energy meters and calculates the power values of all phases by measuring the voltage, current, and power factor on the load side; and the calculated power values will be sent to the cloud data base Voltage and current are measured by a current transformer (CT) and a potential transformer (PT) connected on both the incoming side and the load side in order to avoid meter bypassing. A program-based algorithm has also been developed to calculate the power factor and other power quantities. This IoT-based energy meter uploads the measured quantities to an online database, and the same are also displayed on an LCD meter. An Android™-based application is also developed for user-end control. Consumers can observe the resultant values, switch loads remotely, and pay electricity bills through the same application. When the power factor of any consumer is less than the standard value, the system will automatically notify utility company about the affecting load.

scholarly journals Investigation of transformer failure in Indonesia

2018 ◽  
Vol 197 ◽  
pp. 11004
Author(s):  
Brian Bramantyo S.D.A. Harsono ◽  
Aristo Adi Kusuma ◽  
Buyung Sofiarto Munir ◽  
Nur Widi Priambodo
Keyword(s):  
Visual Inspection ◽  
Short Circuit ◽  
Current Transformer ◽  
Open Circuit ◽  
Protection System ◽  
Response Analysis ◽  
Secondary Circuit ◽  
Waveform Data ◽  
Possible Cause ◽  
Assessment Result

Transformer failure investigation is important to obtain necessary actions which prevent similar failure from happening in the future. An investigation was conducted upon the failure of a transformer in Indonesia which damaged substation apparatuses nearby. To determine possible cause of the failure, the investigation was performed by doing visual inspection after failure, further analysis on related historical assessment result data and simulation using related nameplate and actual configuration. Most historical assessment result data showed no early failure indication of the transformer, while sweep frequency response analysis (SFRA) test result showed severe deformation on both primary and secondary winding. A simulation using Transient Analysis Program for internal short circuit between winding and ground was conducted and the output waveform was identical to Digital Fault Recorder (DFR) waveform data during transformer failure. Therefore, the possible cause of transformer failure was internal arcing on primary winding to ground which could not be interrupted by the protection system. According to visual inspection after failure, the possible cause of protection system malfunction was accidental open circuit in Current Transformer (CT) secondary circuit which damaged whole CT wiring.

scholarly journals Kajian Ketelitian Current Transformer (CT) Terhadap Kesalahan Rasio Arus pada Pelanggan 197 kVA

2019 ◽  
Vol 11 (1) ◽  
pp. 9-16
Author(s):  
Aas Wasri Hasanah ◽  
Tony Koerniawan ◽  
Yuliansyah Yuliansyah
Keyword(s):  
Electricity Consumption ◽  
Current Transformer ◽  
Indirect Measurement ◽  
Energy Losses ◽  
Flow Ratio ◽  
Current Ratio ◽  
Accuracy Class ◽  
Ratio Error ◽  
Energy Meter ◽  
Before And After

With the growth of electricity consumption getting bigger, the possibility of greater losses arises from measuring energy in customers. One cause of the losses due to mistakes in flow ratio CT (Current Transformer) installed on APP Box indirect measurement. Necessary to test the CT accuracy class to determine the current ratio error limits set by the standard PLN. Then do the replacement on the CT accuracy class to resolve this issue. This activity is done at the customer PT. Astra Int Auto 2000 by replacing the CT accuracy class of 0.5 becomes 0,5S. There is a comparison of the measurement between the two different classes. Based on the results of tests performed, a decline in the current ratio error before and after the replacement of accuracy class. After calculating the error margin of the second flow ratio CT installed that are not measured by the energy meter. This Value kWh that is the losses to PT. PLN (Persero) Area Depok. So understanding CT as one of the tools of measurement (instrumentation) should be changed to a point of transaction (point of transaction). So that the revenue gains kWh a business orientation that is fundamental to PLN by pressing slightly possible energy losses (losses) that occur in the measurement system.

Development of Waveform Reconstruction Method with Current Transformer Saturation

2009 ◽  
Vol 129 (1) ◽  
pp. 15-21 ◽  
Author(s):  
Shoichi Urano ◽  
Takeshi Yamada ◽  
Yoshifumi Ooura ◽  
Youheng Xu ◽  
Yasutaka Yamaguchi ◽  
...  
Keyword(s):  
Current Transformer ◽  
Reconstruction Method

A Direct Sensing Current Transformer for the Vehicle Inverter

2013 ◽  
Vol 133 (11) ◽  
pp. B337-B343
Author(s):  
Kinya Nakatsu ◽  
Koichi Yahata ◽  
Ryuichi Saito
Keyword(s):  
Current Transformer ◽  
Direct Sensing
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