This paper presents a comprehensive methodology for the precise calibration of high-voltage capacitance and dissipation factor (DF) bridges. The technique involves meticulous adjustments using a digital high-precision phase and ratio-measuring system to determine correction factors for DF and capacitance measurements. Unlike other methods that …
The maximum voltage for capacitor calibrations is presently 170 kV at 60 Hz. The restrictions are imposed by the supply transformer and not by limi- tations in the measurement instrumentation. There- fore, this constraint should not be considered time invariant and clients should contact NIST about present physical limitations.
In order to calibrate the 200-kV high-voltage measuring system, its divider and display are connected in parallel with the two series pre-calibrated capacitors. The display used to detect the low voltage of the two series capacitors is the traceable HP-3458A DMM.
The most accurate capacitor calibrations have an uncertainty of ±25 ppm for capacitance and an un- certainty of ±5xlO~* for dissipation factor. For capacitors with large dissipation factors, the dissi- pation factor uncertainty is generally at least ±1% of the measured value ±5X 10~*.
The voltage transformer calibration is of the direct null type, and the capac- itor calibration is of the comparative null type. In other words, the accuracy of the capacitance mea- surements ultimately depends on the uncertainty in assigning a value to a standard capacitor.
The adapted calibration technique is divided into three main setups. The first setup is to obtain the actual dividing ratio of each capacitor by calibrating each one via the traceable Phenix-kVM100 reference standard up to 100-kV AC voltage.
Calibrations at frequencies from 50-400 Hz are avail- able over a more limited voltage range. The service for high-voltage capacitors provides measurements of capacitance and dissipation factor at applied voltages ranging from 100 V to 170 kV at 60 Hz depending on the nominal capacitance.
This paper presents a comprehensive methodology for the precise calibration of high-voltage capacitance and dissipation factor (DF) bridges. The technique involves meticulous adjustments using a digital high-precision phase and ratio-measuring system to determine correction factors for DF and capacitance measurements. Unlike other methods that …
The core competence of the calibration laboratory of HIGHVOLT Prüftechnik Dresden GmbH is the calibration of electrical measurands, with a focus on high-voltage applications. The calibrations are performed at high DC voltages, AC voltages and impulse voltages. Here, it is not only the high voltages that are measured in the calibration processes; instead, the different …
Calibration of High-Voltage Test Equipment Uwe Clauss, Stefan Maucksch, HIGHVOLT Prüftechnik Dresden GmbH, Dresden, Germany 1. Abstract The main key for accurate measurements of voltages and currents in high voltage applications is the performance of the measuring system. It requires a precise calibration traceable to National Standards. …
The calibration resources for capacitance at low voltages (≤ 100 V) covers the interval 100 fF – 1 mF. The most commonly used method for calibration of capacitance standards in the interval 1 nF – 10 μF is substitution measurements where the object is compared to a known standard with the same nominal value. Such capacitance calibrations ...
Various factors affecting the value and voltage dependence of the capacitance of high-voltage compressed-gas capacitors, used as high-voltage measurement standards, are considered. An experimental method for testing the mechanical stability of the electrodes is presented. Results of the comparison of a standard capacitor with other gas capacitors are presented, and it is …
This paper presents an adapted technique to calibrate the AC voltage divider of AC high-voltage measuring systems up to 200 kV at the Egyptian National Institute of Standards. Two identical capacitors have been used as two similar AC high-voltage capacitive dividers. …
We understand that high voltage equipment is often heavy, permanently sited and difficult to move — therefore we are fully equipped to work on site so that equipment and instrumentation can remain in situ. Services include: AC — DC up to 400kV; VLF; Partial Discharge Detection; Capacitance and TanDelta Bridges; Standard Capacitors
This paper presents an adapted technique to calibrate the AC voltage divider of AC high-voltage measuring systems up to 200 kV at the Egyptian National Institute of Standards. Two identical capacitors have been used as two similar AC high-voltage capacitive dividers. Firstly, the dividing ratios of two capacitors have been achieved by calibrating each capacitor …
Comparison of standard high-voltage capacitors and comparison of high-voltage dielectric dissipation factor standards NIM China and NMI Australia have started a comparison program to compare the high-voltage capacitance and dielectric dissipation factor (DDF), with transfer devices provided by NIM China. The transfer devices include a 100 kV ...
This paper presents an adapted technique to calibrate the AC voltage divider of AC high-voltage measuring systems up to 200 kV at the Egyptian National Institute of Standards. Two identical ...
calibrations of high-voltage power equipment depend on standard capacitors. This is the case of volt-age transformers, high-voltage dividers [1], and tangent delta bridges, among others [2]. …
IEEE C37.43 — Standard specifications for high-voltage expulsion, current-limiting, and combination-type distribution and power class external fuses, with rated voltages from 1 kv through 38 kv, used for the protection of shunt capacitors.
This paper focuses on achieving traceability of high voltage measurements up to 200 kV at the Egyptian National Institute of Standards. The measurement system consists of an AC/DC voltmeter and a ...
High-Voltage Standard Capacitors Daniel Slomovitz, Senior Member, IEEE, Marcelo Brehm, Member, IEEE, Daniel Izquierdo, Carlos Faverio, José Luis Casais, and Marcelo H. Cazabat Abstract—The voltage coefficient of compressed gas capacitors is a relevant parameter in high-voltage calibrations. These capacitors, used as standards, are calibrated at low voltages so …
Calibration of power, current, and voltage transducers. 2.3 Microwave Laboratory This lab is responsible for realizing, maintaining, and developing the national primary standard of high …
unambiguous metrological traceability of high-voltage capacitors at high voltages. For this reason, a new method was investigated. Mechanical impulse method [Latzel 1989] Direct voltage method [Latzel 1989] [Slomovitz 2019]: Daniel Slomovitz, et al. "Determination of Voltage Dependence in High-Voltage Standard Capacitors", IEEE transactions ...
Abstract: The voltage coefficient of compressed gas capacitors is a relevant parameter in high-voltage calibrations. These capacitors, used as standards, are calibrated at …
Pressurized gas capacitors can be used in high-voltage tests as: standards in bridge circuits for capacitance and loss factor measurement; part of potential dividers for high-
Standard Source of traceability DC voltage sources: single values DC solid state voltage standard Direct Comparison with primary standard (JVS) 1.018 10 V Temperature 23 ± 2°C 0.03 to 0.2 µV/V 2 95% yes JVS NIS DC current sources: low values Standard Capacitor, Voltage Source, High Resistance Standard Current Generator: current
In this paper, new traceable measurement systems for automatic calibration of high current sources have been established at the National Institute of Standards (NIS), Egypt. These systems...
The AC high voltage is normally measured with high voltage divider which presents the standard dividing ratio between the unknown high voltage to the recognized standard low voltage. To achieve the traceability of the AC high voltage dividing ratios up to 200 kV at the Egyptian National Institute of Standards (NIS), a methodology using two series identical traceable 100 …
Keywords: standard capacitor, high-voltage test, metrological reliability. 1. INTRODUCTION ... which the transformer under calibration is the standard voltage transformer 4820. C 1 is the capacitor under evaluation, C 2 is composed of low voltage composes with 1 ... Energy Storage. Capacitance Standards and Decades Selection Guide: Types, … 4 · Capacitance standards …
HIGH-VOLTAGE STANDARD CAPACITORS ANALYSIS Pressurized gas capacitors can be used in high-voltage tests as: standards in bridge circuits for capacitance and loss factor measurement; part of potential dividers for high- voltage measurement; part of reference transforming dividers for calibration for instrument transformers [3][4][5]. This article deals with the capacitor as part of a …
The National Institute of Standards and Technology (NIST) calibration service for voltage transformers and high-voltage capacitors is described. The service for voltage transformers …
The capacitor voltage transformer (CVT) has been widely used in high voltage (HV) and ultra-high voltage (UHV) substations to convert the primary voltage into the suitable voltage for measurement devices or relay protection devices. Compared with the conventional electromagnetic potential transformers (PTs), CVTs have great advantages of easy insulation …
In this paper, new traceable measurement systems for automatic calibration of high current sources have been established at the National Institute of Standards (NIS), Egypt. These …
The capacitor is used in determining the voltage coefficients of NBS-owned commercial standard capacitors; in the calibration of customers'' standard capacitors, voltage transformers, and dividers ...
Selection and calibration of capacitors for use as Standards is a challenging task, especially since the accuracies required, depening on the application, can be very demanding for the test gear as well as for the secondary- and working-standards used. Few capacitance meters are suitable if a higher accuracy needs to be achieved, and also few secondary- and working-Standards …
China is at the forefront of the global solar energy market, offering some of the highest quality solar panels available today. With cutting-edge technology, superior craftsmanship, and competitive pricing, Chinese solar panels provide exceptional efficiency, long-lasting performance, and reliability for residential, commercial, and industrial applications. Whether you're looking to reduce energy costs or contribute to a sustainable future, China's solar panels offer an eco-friendly solution that delivers both power and savings.