Redesain penampang kabel wiring APP pelanggan TM untuk perbaikan akurasi pengukuran kWh

Current Transfomer(CT) accuracy for big customers is very important. Constraints Execution of CT accuracy testing on big customers is quite a lot of customers and scattered, and longtime outage duration. Development of electronic kwh Meter for checking on-site CT customers as a solution to these problems. The onsite CT measurement method is carried out by comparing the primary and secondary of the CT by utilizing the current coil on the electronic kWh Meter. This method has several advantages, lower costs, easy procurement, easy and fast operation, so the duration of outages can be minimized. This method is very supportive in the implementation of the Revenue Assurance program. Keywords: English, , 3-5 words ABSTRAK Akurasi CT (Current Transfomer) pada pelanggan besar sangat penting. Kendala Pelaksanaan pengujian akurasi CT pada pelanggan besar adalah pelanggan cukup banyak dan tersebar, dan waktu pemadaman yang lama. Pengembangan kwh Meter Alat untuk pengecekan CT Pelanggan secara on site sebagai solusi permasalahan tersebut. Metode penugukuran CT onsite dilaksanakan dengan membandingkan sisi primer dan sekunder CT dengan memanfaatkan kumparan arus pada kWh Meter elektronik. Metode ini memiliki beberapa keuntungan, antara lain biaya lebih murah, mudah pengadaan,mudah dan cepat dalam pengoperasiannya sehingga lama pemadaman dapat diminimalkan. Cara ini sangat mendukung dalam pelaksanaan program Revenue Assurance dalam memastikan kebenaran CT yang terpasang. Kata kunci: Electronic Meter, CT Testing

A New Research Method for Corrosion Defect in Metal Pipeline by Using Pulsed Eddy Current

Pulsed eddy current (PEC) is a new technique to distinguish corrosion defeats inside and outside the metal pipeline. In comparison with other eddy current techniques, the PEC technique has the advantage of being simple and high velocity. In this article, a brand-new PEC probe based on differential conductivity is established through the combination of modules like square wave generator, eddy current coil bridge, differential current, voltage sample circuits and so on. The 50% duty cycle square wave is used as the driving signal. To measure differential conductance, a coil bridge configuration with two legs is adopted. One leg is composed of measurement eddy current coil and the in-series resistor, and the other is reference eddy current coil and the in-series resistor. Because the two legs go through defects in pipeline non-synchronously, there is a differential conductance between the two coils. A trans-impedance amplify circuit is used to detect coil eddy current. At the same time, two amplifiers are used to measure the differential voltage between the two coils. A 14 bit ADC is used to sample differential voltage, measurement and reference eddy currents which transferred to differential current by main processor Complex Programmable Logic Device (CPLD). CPLD is used to get differential conductance by differential current divide differential voltage. At last the eddy current signal sampling sequence is developed. A dynamic testing fixture with artificial defects carved on the pipeline is used to validate PEC probe’s accuracy. The differential conductance signals were displayed on the oscilloscope. Results showed that the inside defect had two peaks, positive peak and negative peak, but the outside defect only had one positive peak. We can conclude that the brand-new PEC probe has high accuracy in distinguishing the inside and outside defects.

Pengembangan kWh Meter Elektronik untuk Pengecekan CT Konsumen Secara On Site

Current Transfomer(CT) accuracy for big customers is very important. Constraints Execution of CT accuracy testing on big customers is quite a lot of customers and scattered, and longtime outage duration. Development of electronic kwh Meter for checking on-site CT customers as a solution to these problems. The onsite CT measurement method is carried out by comparing the primary and secondary of the CT by utilizing the current coil on the electronic kWh Meter. This method has several advantages, lower costs, easy procurement, easy and fast operation, so the duration of outages can be minimized. This method is very supportive in the implementation of the Revenue Assurance program.

A METHOD FOR CALIBRATING 10-TURN AND 50-TURN CURRENT COIL USING MULTIPRODUCT CALIBRATOR

<p>This paper presents a traceable measurement method developed in the Laboratory of National Measurement Standards for Electricity and Time (NMS Lab for Electricity and Time) - National Standardization Agency of Indonesia for calibrating current coil in order to obtain correction and uncertainty estimation of the current coil windings number (N). Current coils as objects of this research were 10-turn and 50-turn current coil. Calibration was performed using standard multiproduct calibrator (MPC) and two auxiliary devices, current coil F-5500 and clamp meter F-337. Correction and uncertainty values of N current coil were evaluated for DC and AC supplied current using formulation developed based on principle of current division between current coil output and supplied current from MPC. Based on evaluation result analysis, the expanded uncertainties of this method span from 0.47% to 1.0% (when supplied by DC current) and from 0.57% to 1.1% (when supplied by AC current) for 10-turn current coil, and span from 0.44% to 0.65% (when supplied by DC current) and from 0.54% to 0.96% (when supplied by AC current) for 50-turn current coil. Moreover, it also showed that the largest uncertainty component came from current coil F-5500. Meanwhile, the largest correction for 10-turn current coil was obtained 1.2% at 10 A DC, and for 50-turn current coil was obtained -0.47% at 700 A AC. Verification of the calibration and evaluation methods had also been carried out and it indicated that the calibration and analysis methods developed can be used to examine the performance of the current coil.</p>

A Digital Model of the Electrodynamic Acceleration Process in a Coil Gun Devic

The subject of this paper is an analysis of the process of applying kinetic energy to a projectile made from a non-magnetic, electrically conductive material and placed inside of an inductance coil live with alternating current. A digital model of an acceleration system was built, comprising a high-current coil and a cylindrical projectile located inside of the coil. Analytical formulas of the three-dimensional distribution of the axial and radial components of the magnetic field generated by the coil were applied [5]. The mathematical model described herein included the projectile and coil three-dimensional system (with the dimensions and distribution of the coil turns), the parameters of the power supply system and their variations, caused by the energy input to the projectile (and including the variation of: coupling coefficient, pulsation, coefficient of attenuation, inductance, and resistance), and the balance of momentum of the projectile and coil system. A system of equations which depicted the projectile and coil system (the law of electromagnetic induction, the Biot-Savart law, electric-to-kinetic energy transfer, and the balance of momentum of the projectile and coil system) was solved with numerical methods.

Vacuum Birefringence in the Fields of a Current Coil and a Guided Electromagnetic Wave

The vacuum birefringence effect in magnetic fields generated by either a laser-driven capacitor-coil generator or an electromagnetic wave in a radio frequency guide has been theoretically studied. The ellipticity acquired by a linearly polarized laser beam propagating in those fields is calculated. The obtained results are compared with the parameters of the PVLAS experiment aimed at the experimental observation of the vacuum birefringence effect in a magnetic field.