A new deal for safety and quality on MV networks

Griffel, D.; Leitloff, V.; Harmand, Y.; Bergeal, J.

doi:10.1109/61.634156

Cited by 132 publications

(48 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hence, the saturation of the power transformer caused by the injecting power does not need to be considered. The frequency scope of the injecting current signal is roughly 0-120 Hz [9][10][11]21,22]. Thus, the currents with eight frequency points, which is uniformly distributed in this frequency scope, are applied to the injecting transformer to obtain the frequency characteristic of the magnetizing impedance of the corresponding frequency based on the values of injecting current signal and returned voltage signal.…”

Section: Experiments Results and Analysismentioning

confidence: 99%

“…The systems, which have been effectively grounding, protect themselves by switching breakers when grounding faults occur. However, resonant earthed system (namely ineffectively grounded system [9][10][11][12]) could compensate faulting current quickly by adjusting the resonance deviation υ of network through regulating the arc suppression coil. This would make an improvement of the withstanding ability of distribution network and guarantee a safe and reliable power system.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Measurement of Line-to-Ground Capacitance in Distribution Network Considering Magnetizing Impedance’s Frequency Characteristic

et al. 2017

View full text Add to dashboard Cite

Abstract:Signal injection method (SIM) is widely applied to the insulation parameters' measurement in distribution network for its convenience and safety. It can be divided into two kinds of patterns: injecting a specific frequency signal or several frequencies' groups, and scanning frequency in a scheduled frequency scope. In order to avoid the disadvantages in related researches, improved signal injection method (ISIM), in which the frequency characteristic of the transformer magnetizing impedance is taken into consideration, is proposed. In addition, optimization for signal injection position has been accomplished, and the corresponding three calculation methods of line-to-ground capacitance has been derived. Calculations are carried out through the vector information (vector calculation method), the amplitude information (amplitude calculation method), the phase information (phase calculation method) of voltage and current in signal injecting port, respectively. The line-to-ground capacitance is represented by lumped parameter capacitances in high-voltage simulation test. Eight different sinusoidal signals are injected into zero-sequence circuit, and then line-to-ground capacitance is calculated with the above-mentioned vector calculation method based on the voltage and the current data of the injecting port. The results obtained by the vector calculation method show that ISIM has a wider application frequency range compared with signal injection method with rated parameters (RSIM) and SIM. The RSIM is calculated with the rated transformer parameters of magnetizing impedance, and the SIM based on the ideal transformer model, and the relative errors of calculation results of ISIM are smaller than that for other methods in general. The six groups of two-frequency set are chosen in a specific scope which is recommended by vector calculation results. Based on ISIM, the line-to-ground capacitance calculations through the amplitude calculation method and phase calculation method are compared, and then its application frequency range, which can work as a guidance for line-to-ground capacitance measurement, is concluded.

show abstract

Section: Experiments Results and Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Measurement of Line-to-Ground Capacitance in Distribution Network Considering Magnetizing Impedance’s Frequency Characteristic

et al. 2017

View full text Add to dashboard Cite

show abstract

“…This can be achieved either by comparing signs of projections of zerosequence currents (Griffel et al, 1997;Welfonder et al, 2000) or looking for phase advance (Bastard et al, 1992;Segui et al, 2001) of the faulty zero-sequence current over the sound ones. However, in steady state the strong capacitive currents diminish this phase advance, with possible inhibition of the discrimination capacities of relays.…”

Section: Introductionmentioning

confidence: 99%

Single Line-to-Ground Fault Detection in Face of Cable Proliferation in Compensated Systems

Huang¹,

Kaczmarek²,

Vannier³

2010

Fault Detection

View full text Add to dashboard Cite

“…5), or connected to the zigzag transformer, so that the fault current is practically zero when a fault occurs [4]. The contribution to the fault current from the current capacity of the lines (where a ground fault circulates from a healthy conductor to the earth), is compensated by the current coil [7].…”

Section: Petersen Coil / Resonant Groundedmentioning

confidence: 99%

Ground Fault Protection methods for Distribution Systems

Tavares¹,

Nogueira

2017

neutroaterra

View full text Add to dashboard Cite

The system grounding method option has a direct influence on the overall performance of the entire medium voltage network as well as on the ground fault current magnitude. IntroductionThe system grounding in power distribution substations is an This grounded system protection is particularly advantageous in rural areas, to solve the occurrence of lightning, birds and tree branches caused faults. In urban areas, with mostly permanent faults, resonant grounding system can also be used to guarantee electrical service continuity.Resonant grounding provides self-extinction of the fault arc in overhead lines for about 80% of temporary ground faults [3]. Considering that about 80 % of ground faults are temporary, we conclude that more than 60 % of overhead line ground faults clear without breaker tripping. Highimpedance grounded systems are grounded through a highimpedance resistor or reactor with an impedance equal to or slightly less than the total system capacitive reactance to ground. The neutral resistor is of such a high value that ground faults on such systems have very similar characteristics to those of resonant-grounded systems [4][5].In the next sections we will see different grounded systems and we will analyze their influence on the occurrence of a line-to-ground fault, and the influence of direct and resistive faults at different network points.

show abstract

A new deal for safety and quality on MV networks

Cited by 132 publications

References 1 publication

Measurement of Line-to-Ground Capacitance in Distribution Network Considering Magnetizing Impedance’s Frequency Characteristic

Measurement of Line-to-Ground Capacitance in Distribution Network Considering Magnetizing Impedance’s Frequency Characteristic

Single Line-to-Ground Fault Detection in Face of Cable Proliferation in Compensated Systems

Ground Fault Protection methods for Distribution Systems

Contact Info

Product

Resources

About