Design and testing of a three-break 800 kV SF/sub 6/ circuit breaker with ZnO varistors for shunt reactor switching

1992 ◽  
Vol 7 (2) ◽  
pp. 853-861 ◽  
Author(s):  
A.K. McCabe ◽  
G. Seyrling ◽  
J.D. Mandeville ◽  
J.M. Willieme
Keyword(s):  
Circuit Breaker ◽  
Shunt Reactor ◽  
Zno Varistors ◽  
Design And Testing

scholarly journals Investigation and Mitigation of Temporary Overvoltage Caused by De-Energization on an Offshore Wind Farm

Energies ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 4439
Author(s):  
Ajibola Akinrinde ◽  
Andrew Swanson ◽  
Innocent Davidson
Keyword(s):  
Wind Farm ◽  
Phase Plane ◽  
Circuit Breaker ◽  
Offshore Wind ◽  
Offshore Wind Farm ◽  
Circuit Breakers ◽  
Shunt Reactor ◽  
Point Of Common Coupling ◽  
Common Coupling ◽  
Transformer Core

The Ferranti effect could cause a rise in voltage along the cables on a wind farm if the circuit breakers at the receiving ends are switched off. Ferroresonance could also occur due to stuck pole(s) of the circuit breaker during de-energization. This paper reports on the temporary overvoltage (TOV) arising from the de-energization of the circuit breaker connecting the wind turbine to the feeder, the feeder breaker connecting an array of wind turbines to the point of common coupling (PCC), and the opening of the circuit breaker connecting the onshore to the offshore substation. Ferroresonance was characterized using a phase plane diagram and Poincaré map and was identified to be chaotic. The effect of the nonlinear characteristic of the wind transformer core on the ferroresonant overvoltage was examined and increased with the steepness of slope of the transformer curve. A damping resistor, shunt reactor and surge arrester were used to mitigate the overvoltage experienced during the ferroresonant event. The damping resistor was able to reduce the overvoltage to 1.24 P.U. and damped the ferroresonance from chaotic to fundamental mode.

Prevention of reignition overvoltages by phase-angle-controlled switching of a gas circuit breaker at shunt reactor current interruption

1993 ◽  
Vol 113 (5) ◽  
pp. 14-23
Author(s):  
Yoshifumi Yamagata ◽  
Tsutomu Kumagai ◽  
Susumu Nishiwaki ◽  
Hiroaki Toda ◽  
Masayuki Ishikawa ◽  
...  
Keyword(s):  
Phase Angle ◽  
Circuit Breaker ◽  
Current Interruption ◽  
Shunt Reactor ◽  
Controlled Switching

scholarly journals RANCANG BANGUN SISTEM PEMUTUS ARUS SEBAGAI PENGAMAN TEMPERATUR BERLEBIH PADA INKUBATOR BAYI

2021 ◽  
Vol 16 (1) ◽  
pp. 162-171
Author(s):  
Indah Nursyamsi Handayani ◽  
Wike Kristianti ◽  
Mamurotun Mamurotun ◽  
Andy Sambiono
Keyword(s):  
Circuit Breaker ◽  
Hardware Design ◽  
Health Care Facilities ◽  
Sensor Data ◽  
Temperature Control System ◽  
Technology Readiness ◽  
Testing System ◽  
Temperature Parameter ◽  
State Relay ◽  
Design And Testing

Several countries in the world, including Indonesia, have reported baby-care accidents in the baby incubator due to the failure of the temperature control system to maintain a stable temperature. Therefore, this study reports the design of an circuit breaker system as an over-temperature safety in a baby incubator. Experimentally, the prototype consists of hardware design, software design, and testing system design. The hardware design has four main part, sensing layer using PT1000 as a temperature sensor, data processing layer using an ESP32 microcontroller, a circuit breaker system using a solid-state relay as an electronic switching, and LCD as a display. System testing has been done by evaluating the temperature readings on a prototype against the HTC-02 digital thermometer instrument and carried out in the electromedical engineering laboratory. The results show the accuracy of the temperature parameter is 99% and the circuit breaker system is able to cut the current from the power supply to the appliance when the temperature is more than 39°C which is indicated by an incandescent lamp "off" where this is equivalent to a heater at the baby incubator is in the "off" condition. From the results of this test, it can be concluded that the circuit breaker system as a safety over temperature in the baby incubator has functioned according to the design.Recommended the development of this prototype needs to be followed up by testing on low-tech baby incubators available at basic health care facilities so as to improve technology readiness to be effective in the community.

Switching Surge of Shunt Reactor Caused by SF6 Circuit Breaker Operation

1987 ◽  
Vol PER-7 (10) ◽  
pp. 50-51
Author(s):  
H. Kawada ◽  
K. Goto ◽  
M. Hanamura ◽  
S. Yanabu ◽  
S. Nishiwaki ◽  
...  
Keyword(s):  
Circuit Breaker ◽  
Shunt Reactor ◽  
Sf6 Circuit Breaker
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