scholarly journals MOSFET overcurrent protection device in 500 ~ 1000V power supply

2021 ◽  
Author(s):  
Shunzou Ohshima
Keyword(s):  
Power Supply ◽  
Protection Device ◽  
Overcurrent Protection

<p>・Table 1 shows the evaluation results of four types (05-</p><p>T125, (05-T-40), (05-L125A), (05-L-40A)) in a 500V power supply. Table 2 shows the evaluation results of four types (10-T125, (10-T-40), (10-L125A), (10-L-40A)) in a 1000V power supply.<br></p><p>・Figure 5 and Table 3 show the waveform and data of 05-T125. Fig. 6 and Table 4 show the waveform and data of 10-L-40A.</p><p>・ All eight types of waveforms, including those with (), are attached together in a separate document.</p><p><br></p>

scholarly journals MOSFET overcurrent protection device in 500 ~ 1000V power supply

2021 ◽  
Author(s):  
Shunzou Ohshima
Keyword(s):  
Power Supply ◽  
Protection Device ◽  
Overcurrent Protection

<p>・Table 1 shows the evaluation results of four types (05-</p><p>T125, (05-T-40), (05-L125A), (05-L-40A)) in a 500V power supply. Table 2 shows the evaluation results of four types (10-T125, (10-T-40), (10-L125A), (10-L-40A)) in a 1000V power supply.<br></p><p>・Figure 5 and Table 3 show the waveform and data of 05-T125. Fig. 6 and Table 4 show the waveform and data of 10-L-40A.</p><p>・ All eight types of waveforms, including those with (), are attached together in a separate document.</p><p><br></p>

Researches on the Flood Protection and Anti-Seismic Self-Help Bed

2014 ◽  
Vol 945-949 ◽  
pp. 393-396
Author(s):  
Jia Bin Lu ◽  
Hong Sheng Zhao ◽  
Xin Lei Guo
Keyword(s):  
Power Supply ◽  
Flood Control ◽  
Flood Protection ◽  
Storage Battery ◽  
Protection Device ◽  
Personal Safety ◽  
Circular Arch ◽  
Self Help ◽  
External Power ◽  
And Storage

In recent years, floods and earthquakes occur frequently and cause great threats and harm to personal safety. On the basis of my patent named anti-seismic bed, which patent id is 200920287683.8, the flood control and anti-seismic bed is proposed. The anti-seismic bed doesn’t need external power supply and storage battery. When an earthquake occurs, the protection device starts and then an circular arch are formed by rotating protection boards. people are protected in bed body in 0.765s. When floods occur, flood protection airbag is filled with gas and launched by the Atmel89C52 microprocessor and YDE-WDT-P sensors. Bed body can float in the flood. Its functions are similar to the rescue boat and can protect human life’s safety.

CRAFT TF Magnet Power Supply Overcurrent Protection Design

2021 ◽  
Author(s):  
Yang Yalong ◽  
Zhang Ling ◽  
Wang Chongma ◽  
Jiang Li
Keyword(s):  
Power Supply ◽  
Overcurrent Protection

Design of Power Supply for Mining Belt Conveyor Integrated Protection Device KHP178k-z Based on Topswitch-JX

2014 ◽  
Vol 614 ◽  
pp. 241-244
Author(s):  
Hai Zhu Yang ◽  
Zeng Liang Zhang
Keyword(s):  
Power Supply ◽  
Protection Device ◽  
Belt Conveyor ◽  
Reliable Operation ◽  
Output Waveform ◽  
Output Quality ◽  
Belt Conveyors

Mining belt conveyor integrated protection device KHP178k-z is an important device for the supervision and protection of the belt conveyors. A new power supply based on TOPSwitch-JX is designed in this paper to ensure the reliable operation of the device. Applying TOPSwitch-JX, the circuit of the power supply is simplified and the output quality is improved. Experiments show that the output waveform is stable and the ripple is small. The power supply designed is effective to meet the requirements of mining belt conveyor integrated protection device KHP178k-z.

scholarly journals Improvement of algorithms for voltage circuits fault detection in relay protection terminal of 6-35 kV electrical networks

2019 ◽  
Vol 139 ◽  
pp. 01061
Author(s):  
Vladimir Vukolov ◽  
Mikhail Obalin ◽  
Anton Petrov
Keyword(s):  
Fault Detection ◽  
Power Supply ◽  
Relay Protection ◽  
Protection Device ◽  
Electrical Networks ◽  
Network Element ◽  
Voltage Transformer ◽  
Supply Reliability

Issues of increase of consumer power supply reliability by prevention of protection device false operation and unreasonable tripping of the protected network element at malfunction of measuring voltage transformer secondary circuits are considered. Options for implementation in relay protection microprocessor terminals of advanced blocking algorithms in case of voltage circuits fault are proposed.

Fire risks due to unintentionally energized metal structures

2017 ◽  
Vol 35 (5) ◽  
pp. 415-426
Author(s):  
Michael C Stern ◽  
Sean C O’Hern ◽  
Timothy L Morse ◽  
Justin Bishop ◽  
Harri Kytömaa
Keyword(s):  
Molten Metal ◽  
Air Conditioning ◽  
Electrical Equipment ◽  
Protection Device ◽  
Electrically Conductive ◽  
Metal Structures ◽  
Self Heating ◽  
Overcurrent Protection ◽  
Electrical Connections ◽  
Combustible Materials

Improperly grounded electrical equipment can lead to a fire within a home. If electrical equipment in a home is not properly grounded, then an electric fault may cause metal structures (such as heating, ventilation, and air conditioning ducts, metal framing, or screws, nails, and bolts) to become energized without triggering an overcurrent protection device. Electrical connections between these energized materials and grounded objects create an unintended path to ground and can lead to prolonged self-heating that can cause ignition in combustible materials such as wood framing, cellulosic insulation, and other lightweight combustibles. Alternatively, molten metal that is capable of igniting lightweight combustibles can be ejected if the energized surface contacts a well-grounded objected. This article presents results from experiments performed to investigate conditions that cause fires as a result of stray energization of electrically conductive construction items. Resistances, types of nearby combustibles, and other factors were evaluated.

Design of Cross Slide Safety Devices in Engine Lathe

2012 ◽  
Vol 503-504 ◽  
pp. 776-779
Author(s):  
Yue Zeng Xu ◽  
Qun Ying He ◽  
Wei Xin Hu
Keyword(s):  
Power Supply ◽  
Protection Device ◽  
Safety Devices ◽  
The Cross ◽  
Limit Position ◽  
Limit Switch

It presents the design of overtravel protection device for engine lathe C6140.When the cross slide runs to the limit position,the stop dog touches the contact blade of limit switch, which cuts off the power supply of machine and provides protection for lathe.The experiment proved that the device is reliable.

Series Switching Power Supply with Wide Input Voltage Based on Dual-Loop Control

2013 ◽  
Vol 739 ◽  
pp. 454-457
Author(s):  
Hong Mei Xu ◽  
Yong Gao Jin
Keyword(s):  
Power Supply ◽  
Low Cost ◽  
Short Circuit ◽  
Input Voltage ◽  
Switching Power Supply ◽  
Loop Control ◽  
Voltage Range ◽  
Switching Power ◽  
Overcurrent Protection ◽  
Capacitive Load

The circuit of series switching power supply based on voltage and current dual-loop control is proposed, which can work in the voltage range from 12V to 90V. It is less influence to working state when capacitive load is accessed. The circuit have the function of quickly response, short circuit protection and overcurrent protection. The power supply have advantages of low-cost and working stability, which can be used to different various industry alarms and blasting signal lights in the wide voltage range.

scholarly journals MATLAB-SIMULINK BASED INFORMATION SUPPORT FOR DIGITAL OVERCURRENT PROTECTION TEST SETS

2017 ◽  
Vol 60 (4) ◽  
pp. 291-308 ◽  
Author(s):  
I. V. Novash ◽  
F. A. Romaniuk ◽  
Yu. V. Rumiantsev ◽  
V. Yu. Rumiantsev
Keyword(s):  
Power System ◽  
Electric Power ◽  
Information Support ◽  
Protection Device ◽  
Component Library ◽  
Matlab Simulink ◽  
Overcurrent Protection ◽  
Protection Devices ◽  
Simulation Results ◽  
Flexible Models

The implementation of information support for PC-based and hardware-software based sets for digital overcurrent protection devices and their models testing using MatLab-Simulink environment is considered. It is demonstrated that the mathematical modeling of a part of the power system – viz. of the generalized electric power object – could be based on rigid and flexible models. Rigid models implemented on the basis of mathematical description of electrical and magnetic circuits of a power system can be considered as a reference model for the simulation results that have been obtained with the aid of another simulation system to be compared with. It is proposed to implement flexible models for generalized electric power object in the MatLabSimulink environment that includes the SimPowerSystems component library targeted to power system modeling. The features of the parameters calculation of the SimPowerSystems component library blocks that the power system model is formed of are considered. Out of the Simulink standard blocks the models of a wye-connected current transformers were composed as well as the digital overcurrent protection, missing in the component library. A comparison of simulation results of one and the same generalized electric power object implemented in various PC-based software packages was undertaken. The divergence of simulation results did not exceed 3 %; the latter allows us to recommend the MatLab-Simulink environment for information support creation for hardware-software based sets for digital overcurrent protection devices testing. The structure of the hardware-software based set for digital overcurrent protection device testing using the Omicron CMC 356 has been suggested. Time to trip comparison between the real digital protection device МР 801 and the model with the parameters which are exactly match the parameters of the prototype device was carried out using the identical test inputs. The results of the tests demonstrated a close coincidence of results (the divergence of not more than 8 %), that confirms the possibility of using the suggested hardware-software based test set during the development and debugging of new digital relay protection devices.

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