Verification of the short-circuit current making capability of high-voltage switching devices

Abstract. The load current aff ects the value of the short-circuit current in the electric network and, consequently, the voltage value. In some cases, this infl uence must be taken into account for the correct choice of switching devices, remote monitoring the operating modes of electric networks, and determining the modes. It is possible to disconnect loads connected through magnetic starters and contactors. Failure to consider the infl uence of the load current can lead to an incorrect interpretation of the identifi ed grid operating modes during remote monitoring and, as a result, incorrect dispatcher’s decisions. In addition, it is also insuffi cient to specify the choice of switching devices in the 10 kV feed network. The article describes a method for analyzing the three-phase short circuit mode in a 10 kV feed network, taking into account the infl uence of load currents. The method is exemplifi ed by the case of an actual electric network – the 10 kV ring feed network containing reclosers and receiving power from diff erent sections of lowvoltage buses of the “Kulikovskaya” 110/35/10 kV substation, belonging to the Branch of PJSC «DGC of Center”-“Orelenergo.” For this network, the values of the three-phase short-circuit currents at points with diff erent distances from the substation buses have been determined. The authors have fi guredout the values of the load currents and their shares in the total short-circuit current. The voltage values at different points of the network in the case of short circuits have also been determined. The research proves that the effect of the load current on the total short-circuit current should be taken into account for the case of remote short circuits.

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Low-Voltage Switching Devices for High-Voltage Power Supply

Protection Devices and Systems for High-Voltage Applications ◽

10.1201/9780203911648-10 ◽

2003 ◽

pp. 81-101

Keyword(s):

High Voltage ◽

Power Supply ◽

Low Voltage ◽

High Voltage Power Supply ◽

Voltage Switching ◽

Switching Devices

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Figure 3.6 High voltage switching devices HVTS-15, HVTS-5 and HVTS-25 for voltages 15, 5 and 25 kV, respectively, and switching current up to 5 kA. Figure 3.7 HVTS-2-15 series device switching current up to

Protection Devices and Systems for High-Voltage Applications ◽

10.1201/9780203911648-8 ◽

2003 ◽

pp. 58-78

Keyword(s):

High Voltage ◽

Switching Current ◽

Voltage Switching ◽

Switching Devices

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Frequency and time fault diagnosis methods of power transformers

Measurement Science Review ◽

10.1515/msr-2018-0023 ◽

2018 ◽

Vol 18 (4) ◽

pp. 162-167 ◽

Cited By ~ 13

Author(s):

Miroslav Gutten ◽

Daniel Korenciak ◽

Matej Kucera ◽

Richard Janura ◽

Adam Glowacz ◽

...

Keyword(s):

Fault Diagnosis ◽

High Voltage ◽

Impact Test ◽

Power Transformer ◽

Short Circuit ◽

Small Deformation ◽

Short Circuit Current ◽

Diagnostic Methods ◽

Response Analysis ◽

Short Circuit Currents

Abstract The authors describe experimental and theoretical analyses of faults of power transformer winding. Faults were caused by mechanical effect of short-circuit currents. Measurements of transformer were carried out in high-voltage laboratory. Frequency and time diagnostic methods (method SFRA - Sweep Frequency Response Analysis, impact test) were used for the analyses. Coils of transformer windings were diagnosed by means of the SFRA method and the time impact test. The analyzed methods had a significant sensitivity to a relatively small deformation of coil. In the analysis a new technique for analyzing the effects of short-circuit currents is introduced. This technique is developed for high-voltage transformers (different types of power). The proposed analyses show that it is necessary to analyze the value of short-circuit current. Short-circuit current represents a danger for the operation of the power transformer. The proposed approach can be used for other types of transformers. Moreover, the presented techniques have a potential application for fault diagnosis of electrical equipment such as: transformers and electrical machines.

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Modeling Analysis of Impedance Characteristics of Saturated Core Superconducting Fault Current Limiter

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.389.1089 ◽

2013 ◽

Vol 389 ◽

pp. 1089-1095

Author(s):

Jun Zhen Peng ◽

Kun Nan Cao ◽

Da Da Wang ◽

Meng Song ◽

Nan Nan Hu ◽

...

Keyword(s):

High Voltage ◽

Short Circuit ◽

Short Circuit Current ◽

Fault Current ◽

Fault Current Limiter ◽

Element Analysis ◽

Superconducting Fault Current Limiter ◽

Saturation Properties ◽

Modeling Analysis ◽

Current Limiter

As one of the most applicable to high-voltage network superconducting fault current limiterSCFCL(saturated core superconducting fault current limiter) ,which use of core saturation properties can be achieved the current-limiting function without delay ,will be the most widely applied in the future,By analyzing the working principle of SCFCL,this paper use of PSCAD and finite element analysis software Ansoft to build the 500kV\/3150A grade SCFCL model and accurate calculation coil self-inductance and mutual inductance, the harmonic of each size and analyzed its Impedance characteristic on the different external parameters,The results show that SCFCL has a excellent performance for high voltage power network short-circuit current limitation, and provides important reference for design.

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