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.

A Complex Current Ratio Device for the Calibration of Current Transformer Test Sets

2011 ◽  
Vol 18 (1) ◽  
pp. 159-164 ◽  
Author(s):  
Hüseyin Çaycı
Keyword(s):  
Phase Error ◽  
Practical Method ◽  
Power Source ◽  
Current Transformer ◽  
High Accuracy ◽  
Current Ratio ◽  
Test Set ◽  
Ratio Error ◽  
Three Phase ◽  
Test Sets

A Complex Current Ratio Device for the Calibration of Current Transformer Test SetsA practical method with high accuracy in generation and application of error values for calibration of current transformer test sets is described. A PC-controlled three-phase power source with a standard wattmeter is used for generating the nominal and error test currents while an electronically compensated current comparator is used to provide summation and subtraction of them, precisely. With this method, any ratio error and phase displacement values could be generated automatically and nominal and test currents could be grounded on the test set safely. Because of its high accurate ratio and phase error generating capability, any type of test set regardless of its operating principles could be calibrated.

scholarly journals Contribution to experimental investigation of fitting the current transformers' calibration curves

2020 ◽  
Vol 24 (3-4) ◽  
pp. 123-128
Author(s):  
Attila Juhász ◽  
Vladimir Vujičić
Keyword(s):  
Current Transformers ◽  
Current Ratio ◽  
Accuracy Class ◽  
Ratio Error ◽  
Calibration Curves ◽  
Fitting Algorithm ◽  
Time Correction ◽  
Ieee Standard ◽  
Primary Current ◽  
Novel Algorithm

The paper experimentally investigates the problem of fitting calibration curves of current transformers (CTs). An efficient fitting algorithm enables precise and accurate electronic real-time correction of CT errors and thus effective improvement of their accuracy class. The paper presents the results of a novel algorithm that allows correcting the transformers' current ratio error from 0.25% to within 0.004%, based on 8 key calibration points in the range 1% to 200% of the CT's nominal primary current, in line with the new IEEE Standard.

scholarly journals Kinerja Keuangan, Abnormal Return Sebelum dan Setelah Pengumuman Merger

2017 ◽  
Vol 1 (1) ◽  
pp. 73
Author(s):  
Farid Addy Sumantri
Keyword(s):  
Financial Performance ◽  
Abnormal Return ◽  
Stock Exchange ◽  
Abnormal Returns ◽  
Profit Margin ◽  
Current Ratio ◽  
Return On Equity ◽  
Net Profit ◽  
Before And After ◽  
Price Earnings Ratio

This study aims to examine the differences infinancial performance and abnormal returns in the period before and after the announcement of the merger of the companies listed on the Stock Exchange in the period 2004-2013. In this study the measurement of financial performance using four financial ratios which are the current ratio (CR), the net profit margin (NPM), return on equity(ROE) and price earnings ratio (PER), while the abnormal return is measured using the market return and the actual return. This study used purposive sampling in the sampling study. Company samples tested here are 8 companies from various different types of industries. Hypothesis testing is performed using paired sample t test with a confidence level of 5%. The test results of financial performance in the proxy with the current ratio (CR), the net profit margin (NPM), return on equity (ROE) and price earnings ratio (PER) its how sthe difference before and after the announcement of the merger on the companies listed on the Stock Exchange period 2004-2013.

Electricity Usage Monitoring Based On Internet of Things

2021 ◽  
Vol 20 (3) ◽  
pp. 37-42
Author(s):  
Mohd Ridzuan Ahmad ◽  
Hishamuddin Hashim
Keyword(s):  
Internet Of Things ◽  
Electricity Consumption ◽  
Current Transformer ◽  
Consumption Pattern ◽  
Process Scheduling ◽  
Time Data ◽  
Domestic Use ◽  
Electrical Consumption ◽  
The Internet Of Things ◽  
A Current

Electricity monitoring systems have long been used in industrial scenarios such as process scheduling and distribution. This monitoring system needs to be developed for domestic use such as in homes and shops. In recent times, the electricity demand has increased in households with the use of different appliances. The advent of technologies such as the Internet of Things (IoT) has made real-time data acquisition and analysis possible. This project is designed to control and monitor household electricity consumption via smartphones using the ESP8266 Wi-Fi module as a communication protocol and the Blynk application as a private server. The used wifi module provides notification through the Blynk application. The system uses an Arduino Mega2560 microcontroller to control all devices in this project. For monitoring the energy usage, a current sensor type Split Core Current Transformer (SCT013) was used. From the experimental results, it is confirmed that the system is capable of monitoring the whole house’s electrical usage easily. With this system in place, end-users are provided with proper awareness and able to plan their home’s electrical consumption pattern effectively.

Study of an accurate electronic power measurement technique using modified current transformer and potential transformer

2019 ◽  
Vol 41 (13) ◽  
pp. 3666-3678
Author(s):  
Sirshendu Saha ◽  
Saikat Kumar Bera ◽  
Hiranmoy Mandal ◽  
Pradip Kumar Sadhu ◽  
Satish Chandra Bera
Keyword(s):  
Phase Angle ◽  
Measurement Errors ◽  
Light Emitting Diode ◽  
Current Transformer ◽  
Power Measurement ◽  
Measurement Unit ◽  
Measurement Circuit ◽  
Angle Error ◽  
Ratio Error ◽  
High Tension

In high tension power measurement, potential transformer (PT) and current transformer (CT) are used in order to reduce high tension voltage and current, respectively. But both PT and CT suffer from ratio error and phase angle error, which may produce severe error in power measurement. In the present paper, modified designs of PT and CT are combined to develop an electronic power measurement circuit in order to reduce the measurement errors. The modified PT and CT have reduced phase angle error and ratio error. In the power measurement circuit, the instantaneous product of the outputs of these PT and CT is determined by using a simple light emitting diode (LED)-light dependent register (LDR) or LED-LDR-based product circuit. The operation of the proto type power measurement unit designed in the present work has been experimentally tested and the measured outputs are compared with the readings of laboratory standard wattmeter. The experimental results are reported in the paper. Very good linear characteristics are observed.

Simulation and Analysis for Current Transformers with DC Bias and Remnant Flux

2013 ◽  
Vol 765-767 ◽  
pp. 2430-2434
Author(s):  
Xiao Qian Tian ◽  
Bao Shu Li ◽  
Lu Shen
Keyword(s):  
Error Compensation ◽  
Current Transformer ◽  
Scientific Basis ◽  
Current Transformers ◽  
Ratio Error ◽  
Full Wave ◽  
Accuracy Of Measurement ◽  
Dc Bias ◽  
Power Metering ◽  
Fourier Algorithm

The transfer characteristics of current transformers (CT) change due to DC bias, which directly impacts the accuracy of measurement and power metering. Based on equivalent circuit models and core magnetizing characteristic, qualitatively analysis current transformer saturation increase errors of CT. Transfer errors under DC bias and remnant flux are also obtained based on J-A model of CT in PSCAD/EMTDC and full-wave Fourier algorithm to show that the ratio error and phase displacement increase with the DC bias. Based on FFT spectrum analysis to identify remnant flux and DC bias provides scientific basis for error compensation of CT.

scholarly journals Pengaruh Manajemen Modal Kerja Terhadap Profitabilitas (Studi Empiris Perusahaan Manufaktur Yang Terdaftar Di Bursa Efek Indonesia)

2012 ◽  
Vol 4 (1) ◽  
pp. 35
Author(s):  
Ika Permatasari ◽  
Dian Puspitasari
Keyword(s):  
Logistic Regression ◽  
Cash Flow ◽  
Stock Exchange ◽  
Value Added ◽  
Flow Ratio ◽  
Capital Management ◽  
Working Capital ◽  
Current Ratio ◽  
Working Capital Management ◽  
Equity Ratio

AbstractThis research aims to analyze the affect between working capital management as measured by current ratio (CR), cash flow ratio (CFR), and debt to equity ratio (DER) to profitability as measured by value added (VA). The sample used was manufacturing company listed on Indonesia Stock Exchange period 2009-2011. The analysisis using logistic regression. The results show thatcurrent ratio had negativeeffect on the profitability and cash flow ratio had positiveeffect on the profitabilityratio. However, debt to equity ratio had no effect on profitability.

scholarly journals Prepaid RFID-based Electricity Payment System for Rooming Houses

2020 ◽  
Vol 4 (2) ◽  
pp. 105-120
Author(s):  
Erwin Sitompul ◽  
Khoerrudin Syirli
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystal Display ◽  
Electricity Consumption ◽  
Electronic Energy ◽  
Payment System ◽  
Unit Price ◽  
Energy Meter ◽  
Power Limit ◽  
Installation Cost ◽  
Pulse Count

A prepaid RFID-based electricity payment system is proposed in this paper. The system is intended for rooming houses where residents’ electricity overconsumption and outstanding payment are to be avoided by the house owner. An RFID-card is used as the payment instrument. The system consists of two units, the card balance top-up unit (CTU) and the energy credit top-up unit (ETU). The balance of the RFID-card is topped up by using the CTU. With the balance stored in it, the RFID-card is to be used to top-up the energy credit at the ETU. Each of the CTU and the ETU is equipped with a microcontroller, an RFID reader/writer and a user interface in the form of keypad and liquid crystal display (LCD). Furthermore, the ETU utilizes a relay to control the flow of electricity. If the energy credit of a room is exhausted, then the supply of electricity to the room is cut off by the relay. The electricity consumption is calculated based on the number of pulses of the calibration LED of a standardized electronic energy meter. The pulse is transmitted to the microcontroller by using an optocoupler. The RFID-card records the current card balance, the card’s top-up history, and the card’s usage history. The energy credit is stored in the EEPROM of the ETU’s microcontroller. The energy meter is tested to measure the energy consumption of two loads based on the pulses of its calibration LED. The actual power of the two loads are 87.25 % and 94.23 % of the corresponding power rating. The card balance top-up process at the CTU and the energy credit top-up process at the ETU are successfully checked. After every balance top-up and credit top-up, the current card balance is calculated and stored correctly. During the electricity usage, the LCD of the ETU shows the remaining energy credit in IDR and kWh. These are accumulatively reduced every time the pulse count reaches a certain reset number, which corresponds to the electrical energy’s unit price applied. The proposed electricity payment system can be a solution for owners of rooming houses to secure electricity payments from the residents. The installation cost of the system is low and without the need to change the existing electricity purchase method of the house. The house owner also can individually adjust the maximum power limit for each room.

Sign in / Sign up

Export Citation Format

Share Document