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The measurement error of capacitor voltage transformers (CVTs) has poor stability under the complex environment of substations. Conventionally, error detection is performed by regularly comparing the output of standard transformers, which lacks real-time performance. Moreover, CVTs are prone to operating in an out-of-tolerance state.
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.
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.
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.
Modular Three Phase Inverter. Current Sensor and Inverter. Oscillation peaks decrease as the capacitor age increases. Frequency shifts with capacitor age. Evaluation of time domain data is poor. Evaluation of frequency domain data is better, but still unacceptable. • Frequency domain data is processed to improve accuracy.
Centered on resonance mode formulation, an universal error correction method for CVTs in measuring harmonic voltage is proposed based on the piecewise fitting of the transformation ratio.
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 …
Collect same-phase voltage measurement data of CVTs, extract the error state characteristic parameters for CVTs based on the same-phase voltage correlation, and construct a large …
The mutation error experiment simulates the ratio error caused by the breakdown of a single capacity unit, while the gradual error experiment simulates the …
The calculation errors are six orders of magnitude smaller for both capacitor voltage and inductor current for the worst case, the one where the current reaches zero during the deadtimes in 78%...
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 …
The other factor which affects the rate of charge is the capacitance of the capacitor. A higher capacitance means that more charge can be stored, it will take longer for …
Capacitor voltage transformers (CVTs) are measurement devices widely used in high-voltage power grids, and the long-term stability of their measurement errors a
China and State Grid Anhui Electric Power Company Electric Power Research Institute
The proposed improved LSTM model can achieve the CVT ratio error and angle error prediction more accurately and more rapidly than mainstream deep learning algorithms, …
The measurement error of capacitor voltage transformers (CVTs) has poor stability under the complex environment of substations. Conventionally, error detection is …
Although it is possible to measure the overlap capacitance directly, conventional method is not reliable due to high leakage. Here, we show that this error can be corrected in …
The measurement error of capacitor voltage transformers (CVTs) has poor stability under the complex environment of substations. Conventionally, error detection is …
The reading method of the ceramic capacitors is basically the same as the reading method of the resistor. The real capacitance value can be directly shown on the capacitor, and it can also be shown by digits and letters …
PSMA/IEEE Capacitor Workshop –2020.04.21 Mark Scott, Ph.D. scottmj3@miamioh Experimental Setup • Three-phase inverter with replaceable dc-link capacitors. • EMI current …
The smallest capacitor will therefore be the limiting factor. However, because each capacitor can hold a different capacity, the voltage of each capacitor will be different. We …
PSMA/IEEE Capacitor Workshop –2020.04.21 Mark Scott, Ph.D. scottmj3@miamioh Experimental Setup • Three-phase inverter with replaceable dc-link capacitors. • EMI current …
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 …