Distance Relay Coordination with case study
Distance Relay Coordination with case study The coordination of distance relays is relatively simple, but there are certain principles that […]
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What is Optical Voltage Transducer
In the foregoing, it has also been pointed out that CCVTs have difficulty retaining accuracy during transient conditions. In particular,
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Phase Overcurrent setting of Transmission line
Assume that the digital relay protecting the transmission line has phase overcurrent elements in addition to the distance elements. Let
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How to control Frequency in DC Transmission
In case of a.c. systems frequency can be controlled by adjusting steam input to the prime movers. If the frequency
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Advantages of D.C Transmission
Advantages of D.C Transmission Line Circuit: The line construction is simpler as compared to a.c. transmission. A single conductor line
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Operation of high voltage Transmission line
Operation of high voltage Transmission line The operation of transmission line starts as soon as the line is energized for
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Safety Requirements for EHV Transmission Line Construction
Before start of any construction activates all the working crew, site supervisors, engineers, and contractors should be made aware of
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Procedure For Stringing of Conductor
Procedure For Stringing of Conductor The stringing activities are mainly consisting of the following: Hoisting of insulators Paying of conductor/ground
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Vibration Damper in Transmission Line conductor
Vibration in Transmission Line conductor The overhead transmission lines experience vibrations in the vertical plane and are of two types.
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What is Bundled Conductor
What is Bundled Conductor? For voltages in excess of 230 kV, it is in fact not possible to use a
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What is Skin effect and Proximity effect
What is Skin effect? When direct current flows in the conductor, the current is uniformly distributed across the section of
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How to locate Cable fault
Cable fault locate technique Without cable fault indicators the utility must rely on more manual techniques for finding the location
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Auto Reclose Protection in EHV Transmission Line
Auto-reclosing on EHV Transmission Networks The most important consideration in the application of auto-reclose to EHV transmission lines is the
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What is Power Swing. Their effect on distance relay and detection method
What is Power Swing? Power Swing which is basically caused by the large disturbances in the power system which if
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Zone Protection setting of Transmission Line
Zone protection Generally zones Z1, Z2, Z3 are taken as forward direction and Z4 is taken as reverse direction with
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What is Distance Protection in Transmission line
What is Distance Protection? A distance protection element measures the quotient impedance (V/I), considering the phase angle between the voltage
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XLPE cable: Construction, Voltage rating, Advantage
Introduction Cross linked polyethylene (XLPE) insulated single core and multicore cables are manufactured with colours of cores red, yellow, blue
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Underground Cable: Their types, Rating, insulation material, advantages
Introduction Since the loads having the trends towards growing density. This requires the better appearance, rugged construction, greater service reliability
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Underground Cable laying Standard Method
Method of Underground Cable laying Laying Underground Cables can be done by the 3 methods namely: Direct Laying Draw in
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Types of Faults and analysis in Power system
Fault in Power system A fault in a power system or circuit is a failure which interferes with the normal
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HVDC Transmission: Types of HVDC link and components
Introduction Electric power transmission was originally developed with direct current. The availability of transformers and the development and improvement of
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Different types of Protection on Transmission line
Types of Protection on Transmission line Line protection is achieved by following protection system: Distance Protection Over current and Earth
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Earth fault Relay protection in Power Transmission Line
Definition of Earth fault relay Earth fault relay is used to sense ground or earth-faults i.e. L-G faults and L-L-G
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Plug setting (PSM) and Time setting multiplier in Overcurrent protection of Transmission line
Overcurrent relay operates when load current exceeds pre-set value i.e. pick up value. Transmission lines, distribution lines, large power equipment
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Directional overcurrent relay protection in Power system
A radial feeder fed from one end protected by overcurrent relay, fails to maintain uninterrupted supply when circuit breaker near
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What is Directional or reverse power relay and their working and application
Definition Directional feature is realized by comparing the direction of flow of line current with reference to the bus voltage
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Over current protective schemes in Power Transmission/Distribution system
Introduction Power Transmission/Distribution system i.e. radial feeders uses overcurrent protection scheme. Feeder is divided in two or more section and
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What is Corona effect in transmission line
What is corona ? At higher voltages, the localized high electric fields ionize the air surrounding the surface of the
What is the Electrical Power transmission?
Definition of Electrical Power transmission Electric power transmission is one process in the transmitting of electricity to consumers. The term