scholarly journals Rational reconstruction of sectioning posts of AC catenary at disconnectors

2021 ◽  
Vol 80 (5) ◽  
pp. 269-275
Author(s):  
L. A. German ◽  
E. A. Donskoy ◽  
S. A. Kapustin
Keyword(s):  
High Speed ◽  
High Reliability ◽  
Short Circuit ◽  
Circuit Breaker ◽  
Reliable Operation ◽  
Regulatory Documents ◽  
Vacuum Circuit Breaker ◽  
Traction Network ◽  
Heavy Haul ◽  
Automatic Reclosing

Operation of sectioning posts of the AC catenary at the disconnectors on the Gorkovskaya railway for a period of more than 60 years has shown its reliable operation, and the maintenance was reduced to a minimum. However, due to the growth of heavy haul and high-speed traffic on a number of sections, their reconstruction was required. In accordance with the current regulatory documents, such a reconstruction provides for the transfer of the operation of sectioning posts from disconnectors to circuit breakers. In connection with the reliable operation of the sectioning posts on disconnectors and the simplicity of their maintenance, it is proposed to expand the options for the reconstruction of the sectioning posts on the disconnectors and to introduce three reconstruction options into the regulatory documents. The first option provides for the reconstruction of the sectioning post with disconnectors by transferring it to the classic scheme with four switches, as indicated in the current regulatory documents. The second option provides for leaving the sectioning post at the disconnectors, but adding a fast-acting automatic reclosing device in the inter-substation zone in case of passing short circuits. The third option provides for the reconstruction of the sectioning post on disconnectors with the introduction of a vacuum circuit breaker into the bus of the post and a device for high-speed automatic reclosing and opening of the disconnector, in the zone of which a short circuit has occurred. The schemes of automatic devices for determining a stable (passing) short circuit in a traction network and a device for determining the location of damage are considered. The operation of the sectioning posts, reconstructed according to the indicated options, has been tested practically at the existing sections of the power supply of the traction network of the Gorkovskaya railway. All of them have shown high reliability.

scholarly journals A new algorithm for automating power supply of an AC traction network with a sectioning points on switches

2017 ◽  
Vol 76 (5) ◽  
pp. 266-272
Author(s):  
L. A. German ◽  
A. Yu. Popov ◽  
A. V. Samorukov ◽  
D. V. Ishkin ◽  
D. V. Yakunin ◽  
...  
Keyword(s):  
Power Supply ◽  
Short Circuit ◽  
Circuit Breaker ◽  
Contact Network ◽  
Successful Operation ◽  
Traction Substation ◽  
Traction Network ◽  
Long Time ◽  
Traction Substations ◽  
Automatic Reclosing

The article considers modern sectioning points on contact network and determining the location of the damage, imthe switches, which differs by the introduction of new functions for plemented in the IntTer smart terminal. These new functions are determining a stable (or passing) short circuit in the disconnected deciding whether to perform a quick automatic restart of the circuit breakers after an emergency shutdown or finding the fault zone without testing the insulation of the contact network. The principle of operation of the functions under consideration is analyzed in the article. The limits of the optimum time of the current-free pause of the circuit breaker for automatic re-activation (AR) for each inter-substation zone are established. The paper describes the existing algorithm for automating power supply of an AC traction network (the normal reclosing algorithm) and indicates the unfavorable consequences from its application, in particular, related to the long time of the absence of voltage in the contact network. It was noted that the decision to reduce the voltage recovery time performed by introducing the function of determining the passing (or stable) short-circuit in the switched-off contact network in traction substations is due to the cost of additional high-voltage equipment and requires a rethinking. Thus, a new algorithm for automating the power supply of the traction network (the BAR algorithm) is presented, which is quite easily implemented at the modern sectioning post, which has voltage transformers for each supply line of the contact network, in contrast to the supply lines of the substation contact network and is caused by the transfer of the function of determining the passing (or steady ) short circuit to the sectioning point. In the article, the issue of performing the automatic reclosure of the power line of the traction substation is considered dependent on the successful operation of the BAR algorithm of the sectioning point. It is established that the most rational option is the implementation of a dependent automatic reclosing of a traction substation using telemechanics. The authors analyze the possibility of manufacturing compact sections of the ac contact network on the basis of single-phase re-closers OR-27.5 kV. It is noted that it is advisable to use a new automation scheme in conjunction with the sectionalization points on reclosers.

Dependence of Short Circuit Breaking Current on its Minimum Arcing Times of a Fast Vacuum Circuit Breaker

2021 ◽  
Author(s):  
Chen Guan ◽  
Xiaofei Yao ◽  
Weidong Wang ◽  
Ran Zhang ◽  
Luyang Zhang ◽  
...  
Keyword(s):  
Short Circuit ◽  
Circuit Breaker ◽  
Vacuum Circuit Breaker

scholarly journals Static Voltage Sharing Design of a Sextuple-Break 363 kV Vacuum Circuit Breaker

Energies ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2512 ◽  
Author(s):  
Xiao Yu ◽  
Fan Yang ◽  
Xing Li ◽  
Shaogui Ai ◽  
Yongning Huang ◽  
...  
Keyword(s):  
Electric Field ◽  
Circuit Simulation ◽  
Short Circuit ◽  
Circuit Breaker ◽  
Normal Operation ◽  
Parallel Structure ◽  
Voltage Distribution ◽  
Fem Model ◽  
Vacuum Circuit Breaker ◽  
A Minor

A balanced voltage distribution for each break is required for normal operation of a multi-break vacuum circuit breaker (VCB) This paper presented a novel 363 kV/5000 A/63 kA sextuple-break VCB with a series-parallel structure. To determine the static voltage distribution of each break, a 3D finite element method (FEM) model was established to calculate the voltage distribution and the electric field of each break at the fully open state. Our results showed that the applied voltage was unevenly distributed at each break, and that the first break shared the most voltage, about 86.3%. The maximum electric field of the first break was 18.9 kV/mm, which contributed to the reduction of the breaking capacity. The distributed and stray capacitance parameters of the proposed structure were calculated based on the FEM model. According to the distributed capacitance parameters, the equivalent circuit simulation model of the static voltage distribution of this 363 kV VCB was established in PSCAD. Subsequently, the influence of the grading capacitor on the voltage distribution of each break was investigated, and the best value of the grading capacitors for the 363 kV sextuple-break VCB was confirmed to be 10 nF. Finally, the breaking tests of a single-phase unit was conducted both in a minor loop and a major loop. The 363 kV VCB prototype broke both the 63 kA and the 80 kA short circuit currents successfully, which confirmed the validity of the voltage sharing design.

Analysis of Dynamic Arc Parameters for Vacuum Circuit Breaker Under Short-Circuit Current Breaking

2019 ◽  
Vol 29 (2) ◽  
pp. 1-5 ◽  
Author(s):  
Hai Chen ◽  
Xiaoming Liu ◽  
Longnv Li ◽  
Yixiong Liu ◽  
Yaqian Zhang ◽  
...  
Keyword(s):  
Short Circuit ◽  
Circuit Breaker ◽  
Short Circuit Current ◽  
Vacuum Circuit Breaker

A Model-Based Fault Detection Methodology for Vacuum Circuit Breaker

2013 ◽  
Vol 321-324 ◽  
pp. 739-742
Author(s):  
Yu Huang Zheng
Keyword(s):  
Fault Diagnosis ◽  
Fault Detection ◽  
Dynamic Model ◽  
Test Data ◽  
High Speed ◽  
Circuit Breaker ◽  
Theoretical Data ◽  
Experimental Results ◽  
Model Based ◽  
Vacuum Circuit Breaker

Vacuum circuit breaker becomes more and more complicated, integrated, high-speed and intellectualized. To insure vacuum circuit breaker in its good conditions, the function of fault diagnosis gets more important than before in the process of repairing. This paper is addressed a model-based fault detection methodology for vacuum circuit breaker. At first, the dynamic model of vacuum circuit breaker is built. Secondly, DTW algorithm is introduced to compute the similarity value between the test data and the theoretical data. At last, the value comparison between the similarity and the threshold concludes whether a fault has occurred or the vacuum circuit breaker has potential hazardous effects. The experimental results show that this method is effective.

Extraction of the Geometric Features from the Vacuum Switching Arc Images

2013 ◽  
Vol 333-335 ◽  
pp. 860-863
Author(s):  
Hua Jun Dong ◽  
Wen Liang Dong ◽  
Kai Kang ◽  
Dao Shun Wang
Keyword(s):  
Power System ◽  
High Speed ◽  
Circuit Breaker ◽  
Morphological Characteristics ◽  
Vacuum Arc ◽  
Cmos Camera ◽  
Camera System ◽  
Vacuum Switch ◽  
Vacuum Circuit Breaker ◽  
Critical Components

Vacuum circuit breaker is one of the major critical components that controls and protects the power system. The breaking capability of the vacuum switch directly affects the safety of the power system. However, the breaking capability of the vacuum switch is determined by the morphological characteristics of the vacuum arc images. In this paper, in order to research the variation of the vacuum arc, a high-speed CMOS camera system is used to collect the vacuum arc images within a short gap (7mm), the morphological characteristics of the vacuum arc images are extracted based on the digital image processing. At last, the variation of the arc is analyzed.

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