Performance of Electromagnetic Oil Circuit Breakers Under Hyperbaric Conditions

2019 ◽  
Vol 53 (1) ◽  
pp. 74-82
Author(s):  
Narayanaswamy Vedachalam ◽  
Arunachalam Umapathy ◽  
Sethuram Muthukrishna Babu ◽  
Kandan Venketesan ◽  
Nanda Kumar Suresh Kumar ◽  
...  
Keyword(s):  
Power Systems ◽  
Circuit Breaker ◽  
Deep Ocean ◽  
Electric Circuit ◽  
Circuit Breakers ◽  
Hyperbaric Chamber ◽  
Industry Standard ◽  
Viscosity Increase ◽  
Electromagnetically Actuated ◽  
Hyperbaric Conditions

AbstractUnderstanding the influence of ambient hydrostatic pressure in the electric circuit breaking performance of pressure-compensated (PC) electromagnetically actuated oil circuit breakers is essential for the design of reliable deep ocean power systems. Experiments are conducted using an industry-standard 300-V direct current PC power contactor in a hyperbaric chamber. It is identified that at 150-bar pressure, the circuit breaking duration and arc energy reduce fivefold and threefold, respectively, compared to their performance at 1-bar conditions. At pressures greater than 200 bar, the circuit breaker opening duration increases due to the increase in the viscosity of the dielectric PC oil. This leads to increased arc energy and formation of larger carbon conglomerations due to the breakdown of dielectric oil. During the hyperbaric experiments, the pressure-induced viscosity increase was offset by increasing the oil temperature.

Pressure-Tolerant Electronics and Discharge Performance of Pressure-Compensated Lead Acid Batteries Under Hyperbaric Conditions

2018 ◽  
Vol 52 (5) ◽  
pp. 110-117 ◽  
Author(s):  
Billavara Omaiah Vishwanath ◽  
Narayanaswamy Vedachalam ◽  
Panayan Muthuvel ◽  
Kannaiyah Jayanthi ◽  
Gidugu Ananda Ramadass
Keyword(s):  
Deep Ocean ◽  
Ambient Conditions ◽  
Hyperbaric Chamber ◽  
Discharge Performance ◽  
Terminal Voltage ◽  
Reliable Design ◽  
Glass Mat ◽  
Vrla Battery ◽  
Hyperbaric Conditions ◽  
Lead Acid

AbstractUnderstanding the variations in the energy discharge performance of pressure-compensated valve-regulated lead acid (PC VRLA) batteries under the influence of increased hydrostatic pressure is essential for the reliable design of deep-ocean battery-powered systems. The paper reviews developments in the field of pressure-tolerant electronics and presents observations from the experiments done on a12 V‐40 Ah absorbent glass mat type PC VRLA battery in a hyperbaric chamber at 600 bar pressure. It is identified that, during discharge at 600 bar pressure, the terminal voltage and energy discharge capacity of a 12-V fully charged battery drop by 1.05 V and about 15%, respectively, and need to be discharged below the minimum voltage levels recommended under normal ambient conditions. The identified results, along with the temperature derating factor, could be used for sizing of deep-ocean operated PC VRLA batteries.

scholarly journals Fault Diagnosis Algorithm and Protection of Electric Power Systems in an Alternative Distribution System

2020 ◽  
Vol 1 (3) ◽  
pp. 8-16
Author(s):  
Oshin Ola Austin ◽  
Oluwasanmi Alonge ◽  
Ajayi Joseph Adeniyi
Keyword(s):  
Power Systems ◽  
Distribution System ◽  
Short Circuit ◽  
Circuit Breaker ◽  
Research Work ◽  
Short Circuit Current ◽  
Phase System ◽  
Fault Current ◽  
Circuit Breakers ◽  
Protective Devices

In any power systems, protective devices will detect fault conditions and operate circuit breakers in order to disconnect the load from the fault current and limit loss of service due to failure. This fault may involve one or more phases and the ground, or may occur between two or more phases in a three-phase systems. In ground, fault’ or ‘earth fault, current flows into the earth. In a poly-phase system, a fault may affect each of the three phases equally which is a symmetrical fault. If only some phases are affected, the resulting ‘asymmetrical fault’ becomes more complicated to analyze due to the simplifying assumption of equal current magnitude in all the phases being no longer applicable. Therefore, the prospective short circuit current of the fault can be calculated for power systems analysis procedures. This will assist in the choice of protective devices like circuit breakers, current transformers and relays. This research work evaluated and analyzed the occurrence of faults in a distribution system. Fault currents were obtained and the maximum tripping time required for the protective devices to operate were determined. Hence, it was possible to select appropriate relay and circuit breaker for effective operation of a distribution

Influence of Deep-Sea Ambient Conditions in the Performance of Pressure-Compensated Induction Motors

2019 ◽  
Vol 53 (1) ◽  
pp. 67-73 ◽  
Author(s):  
Arunachalam Umapathy ◽  
Sethuram Muthukrishna Babu ◽  
Narayanaswamy Vedachalam ◽  
Kandan Venkatesan ◽  
Nanda Kumar Suresh Kumar ◽  
...  
Keyword(s):  
Power Systems ◽  
Deep Sea ◽  
Induction Motors ◽  
Management Systems ◽  
Viscous Drag ◽  
Electric Motors ◽  
Ambient Conditions ◽  
Oil Viscosity ◽  
Hyperbaric Chamber ◽  
Industry Standard

AbstractUnderstanding the influence of low temperature and high hydrostatic pressure in the starting performance of deep-sea pressure-compensated (PC) induction motors is essential for sizing of the motor and upstream power systems. This paper presents the observations from experiments carried out on industry-standard 3000-V rated deep-sea PC induction motors of 30- and 60-kW capacities in a hyperbaric chamber. It is identified that the motors consume about 30% of their rated power when started at a pressure of 600 bar and a temperature of 2°C. The results could be used for sizing of deep sea electric motors taking into consideration the increased starting power requirements due to the viscous drag of the PC fluid and to design PC oil viscosity management systems.

scholarly journals Overvoltage Impact on Internal Insulation Systems of Transformers in Electrical Networks with Vacuum Circuit Breakers

Energies ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 6380
Author(s):  
Marek Florkowski ◽  
Jakub Furgał ◽  
Maciej Kuniewski ◽  
Piotr Pająk
Keyword(s):  
Power Systems ◽  
Circuit Breaker ◽  
Dielectric Strength ◽  
Electrical Network ◽  
Electrical Networks ◽  
Circuit Breakers ◽  
Zero Crossing ◽  
Vacuum Circuit Breaker ◽  
Insulation Systems ◽  
The Impact

Vacuum circuit breakers are increasingly used as switching apparatus in electric power systems. The vacuum circuit breakers (VCBs) have very good operating properties. VCBs are characterized by specific physical phenomena that affect overvoltage exposure of the insulation systems of other devices. The most important phenomena are the ability to chop the current before the natural zero crossing, the ability to switch off high-frequency currents, and the rapid increase in dielectric strength recovery. One of the devices connected directly to vacuum circuit breakers is the distribution transformer. Overvoltages generated in electrical systems during switching off the transformers are a source of internal overvoltages in the windings. The analysis of the exposure of transformers operating in electrical networks equipped with vacuum circuit breakers is of great importance because of the impact on the insulation systems of switching overvoltages (SO). These types of overvoltages can be characterized by high maximum values and atypical waveforms, depending on the phenomena in the circuit breaker chambers, system configuration, parameters of electrical devices, and overvoltage protection. Overvoltages that stress the internal insulation systems are the result of the windings response to overvoltages at transformer terminals. This article presents an analysis of overvoltages that stress the transformer insulation systems, which occur while switching off transformers in systems with vacuum circuit breakers. The analysis was based on the results of laboratory measurements of switching overvoltages at transformer terminals and inside the winding, in a model medium-voltage electrical network with a vacuum circuit breaker.

An Electromagnetically Actuated Vacuum Circuit Breaker Developed by Electromagnetic Analysis Coupled with Motion

2004 ◽  
Vol 124 (2) ◽  
pp. 321-326 ◽  
Author(s):  
Toshie Takeuchi ◽  
Takafumi Nakagawa ◽  
Mitsuru Tsukima ◽  
Kenichi Koyama ◽  
Nobumoto Tohya ◽  
...  
Keyword(s):  
Circuit Breaker ◽  
Electromagnetic Analysis ◽  
Vacuum Circuit Breaker ◽  
Electromagnetically Actuated

scholarly journals Solid-State DC Circuit Breakers and their Comparison in Modular Multilevel Converter Based-HVDC Transmission System

Electronics ◽  
2021 ◽  
Vol 10 (10) ◽  
pp. 1204
Author(s):  
Gul Ahmad Ludin ◽  
Mohammad Amin Amin ◽  
Hidehito Matayoshi ◽  
Shriram S. Rangarajan ◽  
Ashraf M. Hemeida ◽  
...  
Keyword(s):  
Solid State ◽  
High Voltage ◽  
Direct Current ◽  
Circuit Breaker ◽  
Transmission System ◽  
Simulation Software ◽  
Fault Current ◽  
Circuit Breakers ◽  
Hvdc Transmission ◽  
Dc Circuit Breakers

This paper proposes a new and surge-less solid-state direct current (DC) circuit breaker in a high-voltage direct current (HVDC) transmission system to clear the short-circuit fault. The main purpose is the fast interruption and surge-voltage and over-current suppression capability analysis of the breaker during the fault. The breaker is equipped with series insulated-gate bipolar transistor (IGBT) switches to mitigate the stress of high voltage on the switches. Instead of conventional metal oxide varistor (MOV), the resistance–capacitance freewheeling diodes branch is used to bypass the high fault current and repress the over-voltage across the circuit breaker. The topology and different operation modes of the proposed breaker are discussed. In addition, to verify the effectiveness of the proposed circuit breaker, it is compared with two other types of surge-less solid-state DC circuit breakers in terms of surge-voltage and over-current suppression. For this purpose, MATLAB Simulink simulation software is used. The system is designed for the transmission of 20 MW power over a 120 km distance where the voltage of the transmission line is 220 kV. The results show that the fault current is interrupted in a very short time and the surge-voltage and over-current across the proposed breaker are considerably reduced compared to other topologies.

scholarly journals Application of an Improved Mayr-Type Arc Model in Pyro-Breakers Utilized in Superconducting Fusion Facilities

Energies ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 4383
Author(s):  
Jun He ◽  
Ke Wang ◽  
Jiangang Li
Keyword(s):  
Power Systems ◽  
Computer Aided Design ◽  
Circuit Breaker ◽  
Black Box ◽  
Driving Mechanism ◽  
Change Rate ◽  
Arc Model ◽  
Arc Behavior ◽  
Current Change ◽  
Aided Design

Pyro-breaker, a fast-responding, highly reliable and explosive-driven circuit breaker, is utilized in several Quench Protection Systems (QPS). The commutation process and its parameters are the main technical considerations in the process of designing a new pyro-breaker. The commutation parameters, such as the commutation time and the current change rate, are not only determined by the electrical parameters of the commutation circuit but also the arc behavior during the operation. The arc behavior is greatly affected by the structure and the driving mechanism of the Commutation Section (CS) in the pyro-breaker. The arc model was developed decades ago and the black-box arc model is considered a valid method to study arc behavior. In this paper, the Schavemaker black-box arc model, an improved Mayr-type arc model, is applied to study the commutation process of a newly designed pyro-breaker. Unlike normal circuit breakers, the arc discussed in this paper is discharged in deionized water. A parameter selection method is proposed. The practicability of the method is verified by numerical calculation in Power Systems Computer Aided Design (PSCAD) and experimentally.

scholarly journals Development of a Method and Algorithm for Inhibiting an Automatic Transfer Switch of the Circuit Breaker for a Sustained Short-Circuit

2020 ◽  
Vol 220 ◽  
pp. 01011
Author(s):  
Igor Nikolaevich Fomin ◽  
Roman Pavlovich Belikov ◽  
Tatyana Anatolyevna Kudinova ◽  
Nailya Kamilevna Miftakhova
Keyword(s):  
Short Circuit ◽  
Circuit Breaker ◽  
Electrical Equipment ◽  
Ring Network ◽  
Circuit Breakers ◽  
Emergency Situations ◽  
Short Circuit Currents

Circuit breakers with automatic transfer switches (ATS) are designed in such a way that when the voltage disappears during a short-circuit (SC) in the ring network line, the ATS device is triggered. At the same time, its switch is turned on at short-circuit, then it is turned off with acceleration. Even a shortterm switching on of the automatic transfer switch for a sustained short-circuit leads to emergency situations [1,2]. The electrical equipment of the ring network spare line is exposed to high emergency short-circuit currents, and the consumers powered by the spare transformer are turned off. It is possible to minimize and eliminate the damages caused by the above mentioned cases by inhibiting the switching on of the circuitbreaker of the automatic transfer switch.

Electric Power Systems KIT - Siemens 3API DT 145kV Circuit-Breaker

2014 ◽  
Vol 698 ◽  
pp. 699-703 ◽  
Author(s):  
Olga Vozisova ◽  
Alexander Egorov ◽  
Anton Trembach
Keyword(s):  
3D Printing ◽  
Power Systems ◽  
Electric Power ◽  
Circuit Breaker ◽  
Electric Power Systems ◽  
Printing Techniques

3D printing techniques provides new power systems equipment industrial designing methods. The new constructor Siemens 3AP1 DT 145 kV circuit breaker is considered in the article.

Sign in / Sign up

Export Citation Format

Share Document