High Voltage
High Voltage Substations Overview (part 2)
Continued from first part: High Voltage Substations Overview (part 1) Transformers are used for the transformation of high and medium voltage to low voltage, flanked by specific protective devices and control systems, which constitute the low voltage distribution substations. A… Read more
Jan 26, 2013 | By Emmanouil Angeladas
High Voltage
High voltage substations overview (part 1)
High voltage substations are interconnection points within the power transmission and distribution systems between regions and countries. Different applications of substations lead to HV substations with and without power transformers: Step up from a generator voltage level to a high voltage… Read more
Jan 25, 2013 | By Emmanouil Angeladas
Cables
Differences Between Earthed and Unearthed Cables
In HT electrical distribution, the system can be earthed or unearthed. The selection of unearthed or earthed cable depends on distribution system. If such system is earthed, then we have to use cable which is manufactured for earthed system. (which… Read more
Jan 21, 2013 | By Jignesh Parmar
High Voltage
Purpose of Disconnect Switches In HV Substation
Switches may be of several types, the common characteristic is that none are designed to interrupt fault currents and the insulation or insulators associated with them must coordinate with the rest of the system and a BIL (Basic insulation level)… Read more
Jan 14, 2013 | By Edvard Csanyi
High Voltage
Environmental Stresses On External Insulation
The external insulation (transmission line or substation) is exposed to electrical, mechanical, and environmental stresses. The applied voltage of an operating power system produces electrical stresses. The weather and the surroundings (industry, rural dust, oceans, etc.) produce additional environmental stresses…. Read more
Jan 07, 2013 | By Edvard Csanyi
High Voltage
7 Golden Safety Rules for Working In HV Laboratory
Employees performing operations and testing work in high voltage laboratory are exposed to a greater hazard than most other employees. Safety rules MUST NOT be seen as a means of limiting our freedom, but should rather be looked upon as valuable… Read more
Dec 26, 2012 | By Edvard Csanyi
High Voltage
Enhance Grid Reliability With Hybrid HVDC Breaker
Introduction to HHVDC How does Hybrid HVDC Breaker work? (VIDEO) Hybrid HVDC Breaker Construction Proactive control Prototype Design Of The Hybrid HVDC Breaker Comparison/Summary The advance of voltage source converter-based (VSC) high-voltage direct current (HVDC) transmission systems makes it possible… Read more
Dec 15, 2012 | By Edvard Csanyi
High Voltage
Methods of Controlling Lightning Overvoltages in HV
For well shielded transmission lines, the backflashover condition, close to the substation, is of prime concern for determining the location and number of surge arresters required to achieve insulation coordination of the substation for lightning surges. The risk of a… Read more
Dec 08, 2012 | By Edvard Csanyi
High Voltage
HV Instrument Current Transformers in T&D
Electrical measurements on a high-voltage transmission and distribution systems cannot be made practically or safely with direct contact to the power carrying conductors. Instead, the voltages and currents must be brought down to a safe and usable level that can… Read more
Nov 23, 2012 | By Edvard Csanyi
High Voltage
The Purpose of High Voltage Circuit Switchers
Circuit switchers have been developed to overcome some of the limitations of fusing for substation power transformers. Circuit switchers have SF6 gas interrupters and are designed to provide three-phase interruption (solving the unbalanced voltage considerations) and to provide protection for… Read more
Nov 16, 2012 | By Edvard Csanyi
High Voltage
Electrical Safety Standards for LV/MV/HV (Part-3)
Continued from part 2 – Electrical Safety Standards for LV/MV/HV (Part-2) Standard: Northern Ireland Electricity (NIE), 6/025 ENA Code: Indian Electricity Rules / Central Electricity Authority Right of Way Clearance (As per GETCO Standard) Minimum clearances between Electrical Lines crossing… Read more
Nov 14, 2012 | By Jignesh Parmar
High Voltage
Electrical Safety Standards for LV/MV/HV (Part-2)
Continued from part 1 – Electrical Safety Standards for LV/MV/HV (Part-1) Standard: Northern Ireland Electricity (NIE), 6/025 ENA Clearances of Electrical Line to Ground and Roads Clearances of Electrical Line to Other Objects Clearances of Electrical Line to Trees and… Read more
Nov 12, 2012 | By Jignesh Parmar
High Voltage
Electrical Safety Standards for LV/MV/HV (Part-1)
Standard: Western Power Company Water Safely Clearance on Electrical Fires Minimum Approach Distance for Authorized Person Minimum Approach Distance for Ordinary Person Minimum Approach Distance for Vehicle and Plant for Ordinary Person . Standard: New Zealand Electrical Code Min. Safe… Read more
Nov 07, 2012 | By Jignesh Parmar
High Voltage
Gas-Insulated Transmission Line (GIL) System Design
GIL systems are based on the successful SF6 tubular conductor technology, which has been around for several decades. GIL consist of a central aluminum conductor with a typical electrical cross section of up to 5,300 mm2. The conductor rests on… Read more
Oct 17, 2012 | By Edvard Csanyi
High Voltage
Design of Overhead Transmission Line Foundation
The foundation is the name given to the system which transfers to the ground the various steady state (dead) and variable (live) loads developed by the transmission tower and conductors. Foundations may be variously subjected to compressive or bearing forces,… Read more
Sep 19, 2012 | By Edvard Csanyi
