The document discusses SF6 gas insulated standard capacitors supplied by Himalayal. Himalayal offers a range of standard capacitors from 2kV to 1000kV, which are widely used in high voltage applications. The capacitors can be calibrated and come with accessories like wheels, connectors, and pressure gauges. Transportation of the capacitors includes pressurizing them with SF6 gas. The capacitors also function as capacitance dividers for high accuracy power transformer loss measurement.
A Resonant Converter with LLC for DC-to-DC Converter Based ApplicationsIJMTST Journal
Conventional voltage mode control only offers limited performance for LLC series resonant DC-to-DC converters experiencing wide variations in operational conditions. When the existing voltage mode control is employed, the closed-loop performance of the converter is directly affected by unavoidable changes in power stage dynamics. Thus, a specific control design optimized at one particular operating point could become unacceptable when the operational condition is varied. This paper presents a new current mode control scheme which could consistently provide good closed-loop performance for LLC resonant converters for the entire operational range. The proposed control scheme employs an additional feedback from the current of the resonant tank network to overcome the limitation of the existing voltage mode control. The superiority of the proposed current mode control over the conventional voltage mode control is verified using an experimental 150 W LLC series resonant DC-to-DC converter.
A Resonant Converter with LLC for DC-to-DC Converter Based ApplicationsIJMTST Journal
Conventional voltage mode control only offers limited performance for LLC series resonant DC-to-DC converters experiencing wide variations in operational conditions. When the existing voltage mode control is employed, the closed-loop performance of the converter is directly affected by unavoidable changes in power stage dynamics. Thus, a specific control design optimized at one particular operating point could become unacceptable when the operational condition is varied. This paper presents a new current mode control scheme which could consistently provide good closed-loop performance for LLC resonant converters for the entire operational range. The proposed control scheme employs an additional feedback from the current of the resonant tank network to overcome the limitation of the existing voltage mode control. The superiority of the proposed current mode control over the conventional voltage mode control is verified using an experimental 150 W LLC series resonant DC-to-DC converter.
Define Electrical Bushing
Be familiar with the reasons for transformer failure
Be Familiar with Online Bushing Monitoring
Identify the future failing bushing.
Detect the condition of electrical bushing.
Benefits of online monitoring
Máy biến áp do tập đoàn LS sản xuất cũng thuộc nhóm sản phẩm cao cấp của thế giới, hiện đang được bán đại trà cho Mỹ, Nhật, Canada, Trung đông, Asia. Các tập đoàn công nghệ hàng đầu như Mitsubishi, Hitachi, Fuji, Siemens,….cũng đang là khách hàng của sản phẩm này trên phạm vi toàn cầu. Hiện LS cũng là một trong những nhà cung cấp Biến thế khô chính của Việt nam với các công trình tiêu biểu như :Royal City, Time City, Nam Á Bank, Air Cargo, Việt Thuận Thành Tower, Lim Tower, Thảo Điền Pearl, Petrovietnam Power Landmark, Petroland Quận 2, Diamond Island, The Era, Royal City, Cresent Mall, Petroland Tower tại Phú Mỹ Hưng, Dragon Hill Residence, Belleza, Khách sạn Continential, Khách sạn Rex, Khách sạn 5 sao Le Meriden, Phú Quốc Airport, Saigon Airport Plaza, Times City, Star City...
S&C Vista SD Underground Distribution Switchgear Outdoor Distribution (17.5 kV and 29 kV) With Visi-Gap Load-Interrupter Switches and Visi-Gap Fault Interrupters - Vault Installation Style
KB Electric may bien ap kho Ls nhap khau KoreaKB ELECTRIC
Chiết khấu cao do KB Electric cung cấp thông tin về nhãn hiệu máy biến áp khô LS nhập khẩu từ Hàn Quốc. Chuyên dùng cho các hệ tòa nhà, cao ốc, bênh viện, trường học, công nghiệp..
600 Series Interface D Compact Elastimold Cable Connectors and Bushings connect and terminate HV cables to Interface D bushings on switchgear and transformers. Elastimold provide high voltage cable accessories to suit the 7 main bushing interfaces : A, B, C (Compact), C (Symmetrical), D, E and F. Elastimold cable joints, cable terminations, epoxy bushings, angled (elbow) and straight plug-in or bolted separable connectors for connecting, jointing and terminating high voltage cables.
600 Series Interface D, Elastimold Bushings
* Bushing Voltage Range 12kV-24kV
* Bushing Current Rating 800Amps
* Bushing Type 5/8"
Bolted Aluminium Stud Elastimold separable elbow connectors are high voltage cable terminations used to connect polymeric (XLPE or EPR insulated) power cables to HV equipment including transformers, switchgear, capacitors and motors. 600 Series Connectors - 676LRA Tee Connectors, 12-24kV 1250Amps 35-630sqmm Slip on cable connectors - quick to install to high voltage switchgear and transformers (oil, air and gas insulated) Touchproof cable terminations - made from conductive EPDM rubber, fully screened HV termination for safety One part cable termination - built-in stress relief, insulation and outer semi-conductive layers Maintenance friendly - readily disconnectable cable connector for high voltage maintenance work Compact cable connectors - space-saving HV cable terminations for SF6 gas insulated switchgear (GIS) EPDM rubber cable connectors - resistant to ozone, corona, chemicals, water and atmospheric pollutants Flexibility - Elastimold cable connectors are disconnectable and re-useable. Re-use of the high voltage cable connector permits site re-location of HV electrical equipment without requiring cable re-termination.
Define Electrical Bushing
Be familiar with the reasons for transformer failure
Be Familiar with Online Bushing Monitoring
Identify the future failing bushing.
Detect the condition of electrical bushing.
Benefits of online monitoring
Máy biến áp do tập đoàn LS sản xuất cũng thuộc nhóm sản phẩm cao cấp của thế giới, hiện đang được bán đại trà cho Mỹ, Nhật, Canada, Trung đông, Asia. Các tập đoàn công nghệ hàng đầu như Mitsubishi, Hitachi, Fuji, Siemens,….cũng đang là khách hàng của sản phẩm này trên phạm vi toàn cầu. Hiện LS cũng là một trong những nhà cung cấp Biến thế khô chính của Việt nam với các công trình tiêu biểu như :Royal City, Time City, Nam Á Bank, Air Cargo, Việt Thuận Thành Tower, Lim Tower, Thảo Điền Pearl, Petrovietnam Power Landmark, Petroland Quận 2, Diamond Island, The Era, Royal City, Cresent Mall, Petroland Tower tại Phú Mỹ Hưng, Dragon Hill Residence, Belleza, Khách sạn Continential, Khách sạn Rex, Khách sạn 5 sao Le Meriden, Phú Quốc Airport, Saigon Airport Plaza, Times City, Star City...
S&C Vista SD Underground Distribution Switchgear Outdoor Distribution (17.5 kV and 29 kV) With Visi-Gap Load-Interrupter Switches and Visi-Gap Fault Interrupters - Vault Installation Style
KB Electric may bien ap kho Ls nhap khau KoreaKB ELECTRIC
Chiết khấu cao do KB Electric cung cấp thông tin về nhãn hiệu máy biến áp khô LS nhập khẩu từ Hàn Quốc. Chuyên dùng cho các hệ tòa nhà, cao ốc, bênh viện, trường học, công nghiệp..
600 Series Interface D Compact Elastimold Cable Connectors and Bushings connect and terminate HV cables to Interface D bushings on switchgear and transformers. Elastimold provide high voltage cable accessories to suit the 7 main bushing interfaces : A, B, C (Compact), C (Symmetrical), D, E and F. Elastimold cable joints, cable terminations, epoxy bushings, angled (elbow) and straight plug-in or bolted separable connectors for connecting, jointing and terminating high voltage cables.
600 Series Interface D, Elastimold Bushings
* Bushing Voltage Range 12kV-24kV
* Bushing Current Rating 800Amps
* Bushing Type 5/8"
Bolted Aluminium Stud Elastimold separable elbow connectors are high voltage cable terminations used to connect polymeric (XLPE or EPR insulated) power cables to HV equipment including transformers, switchgear, capacitors and motors. 600 Series Connectors - 676LRA Tee Connectors, 12-24kV 1250Amps 35-630sqmm Slip on cable connectors - quick to install to high voltage switchgear and transformers (oil, air and gas insulated) Touchproof cable terminations - made from conductive EPDM rubber, fully screened HV termination for safety One part cable termination - built-in stress relief, insulation and outer semi-conductive layers Maintenance friendly - readily disconnectable cable connector for high voltage maintenance work Compact cable connectors - space-saving HV cable terminations for SF6 gas insulated switchgear (GIS) EPDM rubber cable connectors - resistant to ozone, corona, chemicals, water and atmospheric pollutants Flexibility - Elastimold cable connectors are disconnectable and re-useable. Re-use of the high voltage cable connector permits site re-location of HV electrical equipment without requiring cable re-termination.
Utkarsh India Limited is the leading transmission line towers manufacturer in...utkarshindialimited
At Utkarsh India Limited, we offer our customers a full-range-cum-diverse product basket ranging from 66kV to 765kV Towers (Single Circuit, Double Circuit, Multi Circuit Towers suitable for Twin, Quad and Hex Conductor configurations).
Cables radiantes, también denominados Leaky Feeder o Radiating Cable. Con esta tecnología va a permitir disponer de frecuencia banda ancha a lo largo de todo el recorrido donde vaya instalado el cable. Normalmente se instalan en túneles, minas, bien un parking o cualquier otro lugar donde se requiera de cobertura movil o radio.
Underground Cable Accessories
Elastimold® offers the industry's most complete package for managing underground cable connections.
Broad Product Range..
Elastimold accessories, available from 5kV to 138kV, connect, ground, splice, terminate and protect underground cable.
Elastimold Innovation
Elastimold’s long, innovative history includes pioneering such products as extended and repair elbows, jacket seal elbows, and shrink-fit joints.
Research on typical discharge mode of power transformer (www.himalayal.com)Fang Sam
Abstract: Five kinds of oil-paper insulation models are designed and produced to simulate typical defects of power transformer. Plenty of discharge spectrogram and discharge impulse waveform are obtained by using digital PD measuring system. PD features of different defects are analyzed, which will be helpful for further research on PD pattern recognition and insulation aging of power transformer.
Key words: Transformer, partial discharge(PD), oil-paper insulation, discharge model (www.himalayal.com)
How to conduct the test on the linearity of impulse voltage divider? (www.him...Fang Sam
Abstract: In the process of tracing the impulse voltage measuring system, low-voltage DC source or impulse voltage calibrator is utilized to measure the scale factor of voltage divider. Therefore, the effect of linearity of voltage divider on uncertainty of measuring system must be taken into account. Given that the national standard has not been established, an experimental method is put forward in the paper for measuring the linearity of voltage divider. The resistor divider R200S is made use of to obtain the linearity of impulse voltage generator; DC divider is adopted to measure the charge voltage of generator and the ratio of HCR600 indication value to charge voltage; then the linearity of amended generator is obtained. The results show that the linearity of HCR600 decreases from +0.4% to﹣0.8%; the maximum difference between positive polarity and negative polarity is 0.14%; the linearity of negative polarity is superior to that of positive polarity. Moreover, the linearity of 500kV resistor divider with known linearity is used to be compared with that of HCR600. The results show that two curves match basically, and the maximum difference is 0.15% at the same voltage. That means that this method can be used to correctly measure the linearity of measuring divider. In addition, this method can also be applicable to verify the test during the establishment of national standards. If the generator equipment meets some requirements, the method can also be used to calibrate the UHV impulse equipment.
Key words: linearity, impulse voltage generator, impulse voltage divider, efficiency deviation, comparison calibration; scale factor, charge voltage
What is test method of impulse limiting voltage on signal SPD (impulse voltag...Fang Sam
Signal surge protection device is extensively applied in the communication, signal, measurement and industrial control systems, and is used to protect the port, which is sensitive to over-voltage. As for this equipment, impulse limiting voltage directly represents the performance of limiting over-shoot. Both manufacturers and users pay close attention to this indicator.
However, it is found that measured value of signal SPD impulse limiting voltage fluctuates widely. The measured value of the same test object used in different pieces of equipment is very different. Even if the equipment and test object are the same, the measured value still varies greatly according to different test time. The change ranges from 20% to 60%, even higher. This will have severe influence on accurate measurement of parameter and result comparison, and also not helpful for the promotion and application of the whole series of signal SPD.
The root cause for great difference is that test method regulated by test standards has its own defects, resulting in the uncertainty of test conditions. For instance, proposed test method is not suitable for precise data measurement, and we lack technical code for managing test equipment.
How to conduct the lightning impulse withstand test on 550kv GIS?Fang Sam
Abstract: With the rapid development of power grid in China, an increasing number of GIS are adopted in new substations. The lightning impulse test is recommended after the installation of GIS in order to check its insulation performance and reduce the risk of equipment failure. However, owing to the design and production, common lightning impulse generator with large capacitance load especially GIS cannot generate lightning impulse waveform, which meets the requirement. Therefore, based on lightning impulse withstand test of Three Gorges Right Bank 550kV GIS, models of lightning impulse generator and field equipment are established, and simulation calculation is done. According to the result, a method of installing the inductor in the impulse circuit is put forward to generate oscillating lightning impulse which meets the requirement of the test. This method is successfully applied in the test and results are good. Valuable experience has been accumulated for the lightning impulse test on GIS of 750kV, 1000kV substations in China. (http://www.himalayal.com/Impulse-Generator/HowtoConductLightningImpulseTestOnGIS.html)
How to conduct the lightning impulse withstand test on 550kv GIS?
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