A Kind of Online Insulation and Error Online Monitoring Technique

2014 ◽  
Vol 599-601 ◽  
pp. 694-698
Author(s):  
Huan Wang ◽  
Ru Zhang Wang
Keyword(s):  
High Voltage ◽  
Power Supply ◽  
Online Monitoring ◽  
Low Voltage ◽  
Error Monitoring ◽  
Error Measurement ◽  
Measuring Coil ◽  
Monitoring Technique ◽  
Independent Power Supply ◽  
Self Examination

A kind of online insulation and error monitoring technique had been introduced in this paper and this kind of technique had been applied on a dry-CT. This kind of technique takes the low-voltage capacitor which series with the end-screen integration into the insulating core of CTs. The technology ensure the connection point of high-voltage capacitors and low-voltage capacitor will never disconnected and the end-screen lead will grounded forever. In terms of error measurement, self-calibration and self-examination functions are achieved with adding standard and air coil next to the measuring coil. Independent power supply technique makes the device mounting more convenient.

The Feasible Analysis of Transformer Fast Reenergizing with Neutral Point Ungrounded

2013 ◽  
Vol 732-733 ◽  
pp. 958-964
Author(s):  
Yao Zhao ◽  
Yu De Yang ◽  
Yan Hong Pan ◽  
Le Qi
Keyword(s):  
High Voltage ◽  
Power Supply ◽  
Low Voltage ◽  
Second Harmonic ◽  
Neutral Point ◽  
Inrush Current ◽  
Differential Protection ◽  
Time Saving ◽  
Magnetizing Inrush Current ◽  
Transformer Differential Protection

The feasibility of transformer fast reenergizing with neutral point ungrounded after the external fault being removed is analyzed in this paper. By calculating overvoltage and discriminating magnetizing inrush current, it analyzes four ways to restore power of transformer and chooses the optimal strategy which is safe and time-saving. The result shows that in the case of transformer neutral point ungrounded, closing the low-voltage circuit side breaker before the high-voltage, which can effectively limit over-voltage in a safe range. The second harmonic characteristic of magnetizing waveform may disappear, while the intermittent angle characteristics are still significant. With the help of the intermittent angle principle, transformer differential protection may not misuse. The average time for each customer interruption is reduced from 40 minutes to 10 minutes and saves an hour for engineer on the way back and forth. It will greatly improve power supply reliability.

Idejno rešenje regionalnog Data Centra kod Beograda napajanog iz obnovljivih izvora energije

2021 ◽  
Vol 23 (3) ◽  
pp. 10-17
Author(s):  
Ivan Vujović ◽  
Željko Đurišić ◽  
Keyword(s):  
High Voltage ◽  
Power Supply ◽  
Wind Farm ◽  
Low Voltage ◽  
Power Transformer ◽  
Renewable Energy Sources ◽  
Geographical Location ◽  
Electrical Energy ◽  
Economic Benefits ◽  
Infrastructure Development

Telecommunications and computer equipment centralisation trends for the purpose of achieving economic benefits, usage of technological innovations and new technical solutions implementation leads to the requirements for building bigger Data Centres (DCs). An increase in the size of the DC facility i.e. the number of racks inside occupied with equipment and the number of devices that enables the proper functioning of that equipment leads to necessarily power energy requirements increasing for power supply. For the DCs that require a large amount of energy, the building of their own, usually renewable energy sources (RES) is cost-effective. In such a caser, RES are primary and Power System (PS) is secondary and redundant power source. A concept of a DC primary powered from RES is presented in this paper. Generated electrical energy in RES is transmitted in PS through high voltage switch-gears (SGs) while DC is power supplied from PS through low voltage, medium voltage and high voltage SG-s. For the purpose of realisation of such facility, it is necessary to enable adequate conditions related to geographical location, physical access to the facility, possibility of connecting to the PS and possibility of connecting to the telecommunications centres. Based on carried out researches related to RESs potential, available roads, power supply infrastructure and telecommunication infrastructure, development conditions for DC on location near to Belgrade, close to power transformer station „Belgrade 20“ are analysed in this paper. From the aspect of DC power supply, proposed solution includes wind farm, solar plant and landfill gas power plant, as well as related SGs. Telecommunication connections from DC to the PS and other important telecommunication centres are provided. These connections are realised through optical cables placed next to the electrical lines and cables, and, when that is not possible, placed independently in the ground. The design of the DC interior is given and calculations of the required electrical energy for the power supply of the equipment and devices in the facility are performed. Based on calculation results, capacity calculation of the RES and calculation of SGs are performed. Design of the interior optical connections inside DC is also given. A General assessment of the investment and economics of building such DC are given at the end of the paper.

High-voltage portable pulsed power supply fed by low voltage source

2015 ◽  
pp. 1-10 ◽  
Author(s):  
Mohammad Rezanejad ◽  
Abdolreza Sheikholeslami ◽  
Jafar Adabi ◽  
Mohammadreza Valinejad
Keyword(s):  
High Voltage ◽  
Power Supply ◽  
Low Voltage ◽  
Pulsed Power ◽  
Voltage Source ◽  
Pulsed Power Supply

Research on the Pizeoelectric Driving Micro-Flux Valve Power Supply

2011 ◽  
Vol 58-60 ◽  
pp. 727-732
Author(s):  
Hai Chu Chen ◽  
Rui Hua Zhang ◽  
Gen Liang Xiong ◽  
Fa Yun Liang ◽  
Ling Teng Liu
Keyword(s):  
High Voltage ◽  
Power Supply ◽  
Low Voltage ◽  
Piezoelectric Ceramics ◽  
Driving Voltage ◽  
Small Signal ◽  
Precise Control ◽  
Wave Characteristics ◽  
Voltage Output ◽  
Output Characteristics

In order to decrease output micro-flux ripple wave characteristics of the piezoelectric driven micro-flux valve, it carried out research on piezoelectric ceramics driving power supply. In the research, it especially designed the low-voltage and high-voltage stabilizing circuit, small signal amplifying circuit and power amplifying circuit. By applying the power supply, the function signal would be amplified to a high-voltage output to drive the piezoelectric ceramics stack (PZT) to control displacement of the micro-flux valve’s spool, and then realize precise control the micro-flux of the valve. At last, it carried out experimentations on the output characteristics of the power supply, and the experimental results proved the output signal of the power supply have excellent input-output linearity and small ripple wave characteristics, and the high-voltage output ripple wave error is less than 10mV. More over, it used the power supply to drive an 8×8×20mm PZT with capacitance 2.3, and measured the quickly discharging characteristics. The results prove the quickly discharging time is only 10.10ms when the driving voltage is 180V, which means the power supply has excellent quickly discharging characteristics.

scholarly journals Simple control scheme buck-boost DC-DC converter for stand alone PV application system

2019 ◽  
Vol 10 (2) ◽  
pp. 1090
Author(s):  
M. Z. Zulkifli ◽  
M. Azri ◽  
A. Alias ◽  
Md. H. N. Talib ◽  
J. M. Lazi
Keyword(s):  
High Voltage ◽  
Power Supply ◽  
High Intensity ◽  
Low Voltage ◽  
Real Life ◽  
Boost Converter ◽  
Integration System ◽  
Application System ◽  
Pv Panel ◽  
Control Scheme

In this paper a buck-boost dc-dc converter for pv application is proposed, which is mainly composed of a buck – boost converter, PV panel, load and a battery. Existing dc-dc converter can convert the power from the PV panel, but unfortunately the PV panel can only provide power when there is a high intensity of light. In order to provide power supply to the load without any interruption, buck-boost dc-dc converter is introduced. The power intermittency issue of PV panel can be overcome with the aid of a secondary supply which is in this case, the batter. The integration system between the primary and the secondary supply is controlled by a simple proposed control scheme. Battery act as a power in the low voltage side while PV panel is taking over in the high voltage side. Buck-boost converter is operated either is buck or boost mode according to the performance of the PV panel. This paper is presented the simple control scheme to decide the mode suitable for the buck and boost mode. Various conditions are simulated to verify the working operation of the buck-boost converter and to representing solar panel in real life. Simulation and experimental are carried out to verify the system.

scholarly journals DESIGN AND CONSTRUCTION OF A LOW-COST 30KV VARIABLE DC POWER SUPPLY UNIT

2020 ◽  
pp. 3666-3673
Author(s):  
Bolarinwa H.S. ◽  
Fajingbesi F.E. ◽  
Yusuf A. ◽  
Animasahun L. O. ◽  
Babatunde Y. O.
Keyword(s):  
High Voltage ◽  
Power Supply ◽  
Low Voltage ◽  
High Reliability ◽  
Low Cost ◽  
Scientific Data ◽  
High Voltage Power Supply ◽  
Technology Application ◽  
High Voltage Direct Current ◽  
Current Voltage

A high voltage power supply is a key component in the advancement of science and technology. Application of high voltage power supply requires careful attention to critical variables such as voltage ripple, long and shortterm stability, repeatability and accuracy. These are important factors in the consideration of reliable scientific data. This paper presents the design of a low-cost high voltage power supply from the off-the-shelf electronics components to meet the high-end requirement of high voltage power supply. A 30kV, 63.8mA maximum power supply was constructed at the Fountain University electronics workshop. This high voltage directs current (HVDC) power supply was built around three basic compartments that include an adjustable low voltage power supply (LVPS), a high frequency oscillator, and a line output transformer (LOPT) using flyback transformer, NE555timer, BU508D BJT, and other off-the-shelf components. The current-voltage relationship at the output of the constructed High Voltage Direct Current was found to be linear. This power source will serve any high DC voltage applications such as electrospinning. The constructed 30kV power supply has been tested in the electrospinning laboratory of the Center for Energy Research and Development (CERD) Obafemi Awolowo University (OAU) Ile-Ife. The unit successfully electrospun Zinc-Titaninm polymeric solution into fibers at about 8 kV. The importance of this fabricated device is its high reliability despite its low cost and capability to produce different magnitude of high voltage DC.

scholarly journals Adapter-Transceiver for HF Equipment PLC Technology

2020 ◽  
Vol 20 (3) ◽  
pp. 97-109
Keyword(s):  
High Voltage ◽  
Power Supply ◽  
Low Voltage ◽  
Radio Channel ◽  
Power Line ◽  
Ferrite Core ◽  
Information Signal ◽  
Fire Alarm System ◽  
Low Voltage Circuits ◽  
Easy Integration

The paper analyses the features of PLC technologies and describes the circuitry solutions for HF equipment adapters used and their operation modes. It also proposes a new type of transceiver adapters based on a new construction principle that implements a magnetoelectric effect in the structure of a composite. One of the main components of the proposed adapters, which actually translates the HF information signal into the phase wires of the power line, is a ferrite core. The physical effects underlying the operation of the proposed transceiver adapter are analyzed. The main distinguishing feature of the proposed adapter is the absence of transformer and galvanic connections between the high-voltage power line of the power supply network and low-voltage information circuits, which ensures that the effect of the operational high voltage of the power supply line on the low-voltage circuits of HF equipment is blocked. This allows for an easy integration of the proposed version of the adapter-transceiver into standard HF equipment for PLC technologies, boosting the level of its function. The developed new types of adapter-transmitter and adapter-receiver were experimentally tested as part of an experimental fire alarm system, which uses two types of transmission channels: based on wireless technologies employing a radio channel and a PLC technologies-based one.

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