A Novel Ground Fault Non-Directional Selective Protection Method for Ungrounded Distribution Networks

Granizo, Ricardo; Blánquez, F. R.; Rebollo, E.; Platero, Carlos A.

doi:10.3390/en8021291

Cited by 14 publications

(6 citation statements)

References 17 publications

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“…Developed protection algorithm is compared with other earth fault algorithms in Table 3. Comparison is based on the methodology presented in [71]. Developed solutions are compared with conventional earth fault protection methods-residual voltage and ground fault directional current.…”

Section: Protection Algorithmmentioning

confidence: 99%

Novel Earth Fault Protection Algorithm Based on MV Cable Screen Zero Sequence Current Filter

et al. 2019

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This paper presents novel zero sequence current filter and earth fault protection relay, which utilize cable screens earthing current in protection algorithm. Different problems connected with state of the art of zero sequence current filters and protection relays are presented and compared with the proposed solution. The presented concept is verified in PowerFactory simulation software, experiment concerning modeling the earth fault current flow in medium voltage (MV) cable supplied from the low voltage (LV) network and measurements in the MV network in the Polish distribution system. The proposed solution is characterized by higher sensitivity and reduced number of erroneous trips. The presented solution is suitable for any MV cable lines. Biggest advantages are observed in power output lines from renewable energy sources, which are often operated under no-load conditions.

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Section: Protection Algorithmmentioning

confidence: 99%

Novel Earth Fault Protection Algorithm Based on MV Cable Screen Zero Sequence Current Filter

et al. 2019

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“…Each DG is a 1-MVA synchronous generator. Nodes 4,5,6,10,11,12,13,and 15 are key nodes with VTs installed.…”

Section: The Ieee 30-node Meshed Distribution Systemmentioning

confidence: 99%

“…And the stability problems and large ground current caused by increasing penetration of DGs should also be paid attention . In Ou and other literature, it has been shown that the fault analysis method should consider the effect of unbalanced system configuration especially in neutral‐ungrounded system. This paper studies the urban distribution systems which is mainly cable based; thus, the conventional symmetrical fault analysis method is still valid in this paper.…”

Section: Introductionmentioning

confidence: 99%

A two-step protection algorithm for smart distribution systems with DGs

Liu²,

et al. 2018

Int Trans Electr Energ Syst

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Summary Increasing penetration of distributed generators (DGs) is gradually changing distribution networks from a radial structure into a multi‐source one. In addition, some distribution systems are in slightly meshed structures for the interest of smart grids. The traditional protection philosophy is being challenged because the coordination among protection devices is affected by the bi‐directional power flow and the intermittent nature of DGs. This paper proposes a communication‐based protection algorithm considering the impact of bi‐directional power flow in distribution networks with DGs. The proposed algorithm detects and isolates fault sections by a 2‐step search procedure. In step 1, an injected power calculation, in conjunction with a tabu search algorithm, is used to narrow down the fault‐section search region by using the voltage measurements. Step 2 precisely detects the fault section by comparing current phase angle changes. A typical distribution network in Beijing, China and the IEEE 30‐node system are used to illustrate and validate the proposed method.

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“…To detect an insulation fault, especially a line-to-earth fault, which potentially introduces an electric shock hazard or fire hazard, a suitable protective device of a proper sensitivity level should be selected and applied. The type of protective device and its operational algorithm depends on the type of power network (grounded, ungrounded, overhead line, cable line) [4,5], the necessity of detection of an arc fault [6,7], distorted voltages [8], special signals [9], DC currents [10,11], and the necessity of detection of non-sinusoidal alternating earth fault currents. Special attention should be given to the currents comprising very-low-frequency components [12] or high-order harmonics [13][14][15][16][17][18][19], as in circuits with power electronics converters [20].…”

Section: Introductionmentioning

confidence: 99%

Testing Sensitivity of A-Type Residual Current Devices to Earth Fault Currents with Harmonics

Czapp

2020

Sensors

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In many applications, modern current-using equipment utilizes power electronic converters to control the consumed power and to adjust the motor speed. Such equipment is used both in industrial and domestic installations. A characteristic feature of the converters is producing distorted earth fault currents, which contain a wide spectrum of harmonics, including high-order harmonics. Nowadays, protection against electric shock in low-voltage power systems is commonly performed with the use of residual current devices (RCDs). In the presence of harmonics, the RCDs may have a tripping current significantly different from that provided for the nominal sinusoidal waveform. Thus, in some cases, protection against electric shock may not be effective. The aim of this paper is to present the result of a wide-range laboratory test of the sensitivity of A-type RCDs in the presence of harmonics. This test has shown that the behavior of RCDs in the presence of harmonics can be varied, including the cases in which the RCD does not react to the distorted earth fault current, as well as cases in which the sensitivity of the RCD is increased. The properties of the main elements of RCDs, including the current sensor, for high-frequency current components are discussed as well.2 of 20 may prevent a person from fatal electric shock, provided that the RCD's rated residual operating current does not exceed 30 mA, which is assumed as the threshold of ventricular fibrillation [3].

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A Novel Ground Fault Non-Directional Selective Protection Method for Ungrounded Distribution Networks

Cited by 14 publications

References 17 publications

Novel Earth Fault Protection Algorithm Based on MV Cable Screen Zero Sequence Current Filter

Novel Earth Fault Protection Algorithm Based on MV Cable Screen Zero Sequence Current Filter

A two-step protection algorithm for smart distribution systems with DGs

Testing Sensitivity of A-Type Residual Current Devices to Earth Fault Currents with Harmonics

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