Does a capacitor voltage transformer have a harmonic measurement error?
IEEE Transaction on Power Delivery. 2000; 15 (1): 62–72. This paper explores the mechanism for the harmonic voltage measurement error (HVME) of a capacitor voltage transformer (CVT) in a comprehensive way and develops a practical error correction method to improve the harmonic measurement performance of a CVT.
How accurate are capacitive voltage transformer metering errors?
The metering accuracy of capacitive voltage transformers (CVTs) affects the fairness of electricity settlement, and the online measurement of their metering errors has become a research hotspot. This error consists of amplitude and phase errors of three-phase voltages.
Do uncalibrated capacitive voltage transformers degrade measurement accuracy?
Uncalibrated capacitive voltage transformers (CVTs) may significantly degrade measurement accuracy, because of the undetected excessive measurement error (ME). In this article, an online detection method is proposed which combines multi-source heterogeneous data composed of CVT measurements, acceptance test errors, and error limits.
What causes a large error in the measurement of harmonic voltage?
It is now well known that the large error in the measurement of harmonic voltage using a CVT originates from several resonances that are formulated by the stray capacitances and the corresponding inductive element in the circuit.
How can a harmonic measurement error be reduced?
This error can be reduced to a certain extent using the harmonic measurement error correction method proposed in this paper, thus provides a basis for more better understanding the harmonic voltage characteristics of high-voltage systems. 1. Daryani N, Seyedi H. Evidence theory-based identification of aging for capacitive voltage transformers.
How to detect excessive measurement error?
3.2. The online excessive measurement error detection method This method consists of two steps: offline modeling and online monitoring. A fault alarm is issued if either the ratio error or the phase difference is out of limit.
Influencing Factor and Error Analysis of Operating Capacitor …
The results of tests on a 275 kV and a 400 kV capacitor voltage transformer (CVT) are presented. The objective has been to determine the transfer function of the CVTs in the Scottish Power EHV ...
Self-detection method for measurement error of capacitor voltage ...
Thus, this study first analyzes the basic principle of the CVT measurement error self-detection method based on principal component analysis under the constraints of three-phase …
Online measurement of capacitor voltage transformer metering …
The metering accuracy of capacitive voltage transformers (CVTs) affects the fairness of electricity settlement, and the online measurement of their metering errors has …
[PDF] Harmonic voltage measurement error of the capacitor …
A sensor that can be installed directly on a wire and can operate without a galvanic connection to the ground may be used as an alternative voltage measurement device, which can complement current sensors installed on a …
A physics-information-enabled self-updating method to monitor …
Understanding long-term monitoring steady-state errors of capacitor voltage transformers (CVTs) is critical for acquiring accurate and continuous voltage signals from the power grid. ... Compensation of systematic measurement errors in a PMU-based monitoring system for electric distribution grids. IEEE Trans. Instrum. Meas., 68 (10) (2019), pp ...
Online detection of measurement error in three-phase CVT …
Capacitor voltage transformers (CVTs) are measurement devices widely used in high-voltage power grids, and the long-term stability of their measurement errors affects the safe operation of power…
Self-detection method for measurement error of capacitor …
Capacitor voltage transformers (CVTs) are measurement devices widely used in high-voltage power grids, and the long-term stability of their measurement errors affects the safe operation of power…
Measurement Error Estimation for Capacitive Voltage Transformer …
Measurement errors of a capacitive voltage transformer (CVT) are relevant to its equivalent parameters for which its capacitive divider contributes the most.
Self-detection method for measurement error of capacitor …
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(PDF) Harmonic voltage measurement error of the …
Resonant circuits of the CVT with a resonant-type damper. (a) Resonant circuit 1. (b) Resonant circuit 2. (c) Resonant circuit 3. (d) Resonant circuit 4.
An online detection method for capacitor voltage transformer with ...
Uncalibrated capacitive voltage transformers (CVTs) may significantly degrade measurement accuracy, because of the undetected excessive measurement error (ME). In this …
Harmonic voltage measurement error of the capacitor voltage …
2.1 Harmonic equivalent circuit. As shown in Fig 1, the CVT system mainly consists of a capacitive voltage divider, an electromagnetic unit and the burden.The capacitive voltage divider is composed of the high-voltage capacitor C 1 and the medium-voltage capacitor C 2.The electromagnetic unit includes the compensation reactor L C, the intermediate …
What is compensation of measurement errors, and why is it ...
How to measure capacitors/Test a Capacitors (6): What is compensation of measurement errors, and why is it necessary? Capacitors Multilayer Ceramic Chip Capacitors
Capacitive voltage transformer measurement error prediction by …
This paper proposes an improved Long Short-Term Memory neural network (LSTM) for Capacitor Voltage Transformer (CVT) measurement error prediction. The proposed …
Harmonic voltage measurement error of the capacitor voltage …
frequencies of the HECs. The harmonic voltage measurement performances of CVTs with dif-ferent types of dampers are compared in Section 4. Section 5 presents the principle and appli-
Online Capacitor Voltage Transformer Measurement Error State …
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Harmonic voltage measurement error of the …
As seen in Fig 2, the equivalent circuit of the compensation reactor is composed of the inductance L Lc and the resistance R L of the winding, the inductance L Lce and the resistance R Lce of the iron core, and the stray …
Online Capacitor Voltage Transformer Measurement Error State …
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Capacitive voltage transformer measurement error prediction by …
F. Zhou, P. Zhao, M. Lei et al. Energy Reports 8 (2022) 1011–1021 Fig. 1. LSTM neural network based on bidirectional memory improvement strategy.
On-line Monitoring of Measurement Errors of CVT Based on
The information of measurement errors is quantified, and the on-line monitoring of measurement errors of CVT is realized by comparing the quantified value of measurement errors. ... Capacitor Voltage Transformers (CVTs) are widely used in power systems because they have all the functions of electromagnetic voltage transformers and have superior ...
Online Detection Method for Capacitor Voltage Transformer Measurement …
Abstract: Capacitor voltage transformers (CVTs) are measurement devices widely used in high-voltage power grids, and the long-term stability of their measurement errors affects the safe operation of power systems. To address the problem of insufficient real-time periodic calibration using standard transformers, this article proposes an online ...
Detecting measurement error drifts of a capacitor voltage …
Author affiliations. 1 State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, People''s Republic of China. 2 State Grid Shandong Electric Power Research Institute, Jinan 250002, People''s Republic of China
How to Measure a Capacitor with a …
If the capacitor stores charge, it may cause current flow during measurement, resulting in inaccurate measurements or damage to the multimeter. Before …
Self-detection method for measurement error of …
The measurement error of capacitor voltage transformers (CVTs) has poor stability under the complex environment of substations. Conventionally, error detection
Systematical measurement errors
Systematical measurement errors Along the lines of the rule formulated by Schrödinger that a system can influenced ... capacitor and one load resistor shall be contemplated. Input voltage, is a pure sinusoidal signal with a frequency of 50Hz and …
Measurement of capacities, charging and discharging of capacitors
Capacitor, parallel-plate capacitor, dielectric, RC-element, charge and discharge curves of capacitors, phase shift, KIRCHHOFF''s laws, input and output impedances and capacitances Measuring program: Determination of the input resistance of an oscilloscope from the discharge curve of a capacitor, measurement of the capacitance of coaxial
Research on the measurement error of capacitor voltage …
Capacitor voltage transformer (CVT) is one of the most important measuring and protecting devices in power system, whose measurement error is relevant with insu
Detecting measurement error drifts of a capacitor voltage …
In this paper, an innovative approach is proposed to detect the measurement error drift of CVTs connected to the same phase. Through principal component analysis, both the ratio error drift …
An online detection method for capacitor voltage transformer …
The physical mechanism of CVT ME is as follows: From Fig. 1, the high voltage U p on the primary side is divided into medium voltage by the CVD, and then the medium voltage is reduced into the low voltage output U s by the IVT. Since the high voltage U p is stepped down by the CVD, the insulation requirement for the IVT is reduced. The CVD is composed of hundreds …
New parameters for the capacitive accelerometer to reduce its ...
This enhances accuracy by eliminating common-mode errors. Two capacitors are formed by the capacitive plates on either side of the proof mass. One capacitor''s capacitance rises while the other falls in response to the movement of the proof mass. ... This not only reduces measurement errors but also mitigates the undesirable effects of resonance ...
Online Detection Method for Capacitor Voltage Transformer Measurement …
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Harmonic voltage measurement error of the capacitor voltage
This paper explores the mechanism for the harmonic voltage measurement error (HVME) of a capacitor voltage transformer (CVT) in a comprehensive way and develops a …
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