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.
Too large voltage, current, and reactive power harmonics induce capacitor failures. In most cases triplen and even harmonics do not exist in a three-phase system. However, there are conditions where triplen harmonics are not of the zero-sequence type and they can occur within three-phase systems.
According to the issue of transmission characteristics of a capacitor voltage transformer (CVT), which leads to the inaccuracy of power grid voltage harmonics values, a new test system and
Various classical harmonic voltage measurement methods based on Capacitor Voltage Transformer (CVT) have defects in terms of accuracy and economy, and the long-term
Medium Voltage Metal Enclosed Harmonic Filter Capacitor Banks • Voltages from 2.4kV through 38 kV • Reactive power ratings to 40,000 kVar in a single enclosure • Short circuit ratings to 61 kA • Up to 15 Filter Steps in a single bank • Banks come fully assembled, tested and ready for
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
Harmonic voltages, generated by harmonic currents flowing against impedance to the harmonic, can lead to significant overvoltages. Such effects are known to cause equipment failures, and
Transformers and capacitors are additionally loaded. Under the resonant condition, the capacitor draws excessive current and magnifies the harmonic current. The blowing of fuses and or failure of capacitor banks is the symptom
As shown in Fig. 1, every four-level inverter leg is composed by 3 commutation cells connected with a set of two flying capacitor voltage sources VC(i,j) and a pair of 3 turn-on and turn-off controlled commutation cell T(i,j) and T''(i,j) having complementary states. i and j are, respectively, the number of the phase and the inverter commutation cell, such as i ϵ [1–3], j ϵ [1, p], and p
Capacitor voltage transformers (CVTs) are widely used in high-voltage and ultra-high voltage power systems, and harmonic measurement cannot avoid its influence. The
Correction Method for Harmonic Measurement of Capacitor Voltage 655 device [4]. However, the presence of capacitors, inductors, and other energy storage components in CVTs causes significant harmonic measurement inaccuracies. In some cases, variations of up to 200% or more can be seen [5]. At present, guiding docu- ments such as IEC61869-5:2011, IEEE Std
In this paper, an intelligent high-voltage CVT harmonic frequency response test platform based on the sweeping frequency principle is established. The test results of several CVTs show that
Harmonic voltages, generated by harmonic currents flowing against impedance to the harmonic, can lead to significant overvoltages. Such effects are known to cause equipment failures, and capacitors are particularly susceptible. These overvoltages can be enhanced by system resonances whereby a given harmonic current may generate a
According to the issue of transmission characteristics of a capacitor voltage transformer (CVT), which leads to the inaccuracy of power grid voltage harmonics values, a new test system and a method of measuring the capacitive current of a CVT were proposed.
Capacitor voltage transformers (CVTs) are widely used in high-voltage and ultra-high voltage power systems, and harmonic measurement cannot avoid its influence. The calibration of CVTs primarily consists of two steps: accurate frequency response measurement and precise parameter identification.
To Reconstruct the grid Harmonic Voltage based on Leakage Current (RHVLC) of capacitive equipment, the wide frequency dielectric property of capacitive equipment is obtained other than considering it as a pure capacitor. And the frequency transfer function of a practical current sensor is also obtained instead of ideal flat response.
When the manufacturers produce capacitor voltage transformers (CVT), the function of harmonic measurement is not considered. Therefore, this paper explores methods to solve the problems of harmonic
The capacitor voltage transformer (CVT) has been widely used in the power system; However, it is hard to measure correctly the system harmonic with CVT because of its structure containing
Too large voltage, current, and reactive power harmonics induce capacitor failures. In most cases triplen and even harmonics do not exist in a three-phase system.
Understanding Harmonics. Harmonics Defined: Harmonics are voltage or current waveforms that operate at frequencies that are integer multiples of the fundamental frequency. For example, if the fundamental frequency is 50 Hz, the second harmonic will
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...
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. The harmonic equivalent circuit (HEC) of CVTs with different types of dampers are
By installing passive harmonic filters in medium/high-voltage networks, several benefits can be obtained: Higher power factor, improved voltage stability and lower network losses ; Filtering of harmonics in the system to acceptable levels; Lowering of resonance problems and amplification of electrical disturbances; A "clean" network creates much less strain on equipment and
In this paper, an intelligent high-voltage CVT harmonic frequency response test platform based on the sweeping frequency principle is established. The test results of several CVTs show that the frequency characteristics of CVTs manufactured with the same design parameters by the same manufacturer are very close.
When the manufacturers produce capacitor voltage transformers (CVT), the function of harmonic measurement is not considered. Therefore, this paper explores methods to solve the problems of harmonic measurement from the perspective of manufacturers.
Various classical harmonic voltage measurement methods based on Capacitor Voltage Transformer (CVT) have defects in terms of accuracy and economy, and the long-term accurate measurement of harmonic voltage cannot be realized. The method based on capacitor current in time domain is analyzed in this paper. When adopting this method, the 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...
Stray capacitances calculation and harmonic measurement of capacitor voltage transformer. Tiechao Zhu Zhenguo Shao Yixiong Nie. Engineering, Physics. International Journal of Numerical Modelling 2022; When the manufacturers produce capacitor voltage transformers (CVT), the function of harmonic measurement is not considered. Therefore, this paper
to address the problem of harmonic voltage amplification and attenuation, therefore improv-ing the safety of the experimental platform and the accuracy of the experimental results; 3) We present a novel harmonic voltage measurement method based on the alternating current/
Use the link below to share a full-text version of this article with your friends and colleagues. When the manufacturers produce capacitor voltage transformers (CVT), the function of harmonic measurement is not considered. Therefore, this paper explores methods to solve the problems of harmonic measurement from the perspective of manufacturers.
A harmonic component affects the performance of a capacitor unit significantly due to diminishing reactance at higher frequencies, which adds to its loading substantially and can be analysed as follows: If n is the harmonic order, such as 3, 5, 7 and 9 etc., then the harmonic frequency and harmonic reactance
Harmonic voltages, generated by harmonic currents flowing against impedance to the harmonic, can lead to significant overvoltages. Such effects are known to cause equipment failures, and capacitors are particularly susceptible.
In the presence of harmonics, the total power factor is defined as total power factor = TPF = cos0 = Ptotal Stotal (5-6) where Ptotal and Stota1 are defined in Eq. 5-4. Since capacitors only provide reactive power at the funda- mental frequency, they cannot correct the power factor in the presence of harmonics.
Capacitor Bank Behaves as a Harmonic Source. There are many capacitor banks installed in indus- trial and overhead distribution systems. Each capaci- tor bank is a source of harmonic currents of order h, which is determined by the system short-circuit impedance (at the capacitor location) and the capac- itor size.
Interaction of Harmonics with Capacitors 213 the feeder. This may allow the circuit to carry addi- tional loads and save costs for upgrading the network when extra capacity is required. In addi- tion, the lower current flow reduces resistive losses in the circuit. • Improved Voltage Profile.
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