What is Dcds transmission line?

DCDS stands for Double-Circuit, Double Stringing. It means that the transmission line towers have the capability of a double circuit by design and both circuits have been commissioned.

What is a tap transmission line?

Introduction. It is common utility practice to tap transmission lines to serve distribution load. Tapping transmission lines to serve distribution load is a cost-effective alternative to building a substation. Adding a tap to the transmission line introduces protection complications, especially when the tap is long.

What is an EHV substation?

EHV – Extra High Voltage EHV, or Extra High Voltage, is the network that includes equipment and cabling for voltages above 11kV including 33kV and 132kV.

What is tapping in power system?

Tapping in the context of power systems means hooking up a device on a running overhead line to take power from the point. (This could as well be an unauthorised drawing of power by unscrupulous elements ) .

What is the voltage level for EHV substation?

High (HV), Extra- High (EHV) & Ultra-High Voltages (UHV) – 115,000 to 1,100,000 VAC. Medium Voltage (MV) – 2,400 to 69,000 VAC. Low Voltage (LV) – 240 to 600 VAC.

Is 66 kV high voltage?

Distribution lines The voltage of electricity conducted by distribution powerlines may vary from 415 volts (V), which are low voltage, to 66 kV (66,000 volts), which are high voltage.

What is the function of tap changer?

The purpose of a tap changer is to regulate the output voltage of a transformer by altering the number of turns in one winding and thereby changing the turns ratio of the transformer.

Can you steal electricity from power lines?

Power theft carries deadly risks. Many thieves pay for the power they steal with their lives. Electricity theft is not just dangerous for those who steal. If you are on the same power line as someone who steals electricity, you could pay the cost for their theft too.

What is LV and ELV?

Extra low voltage (ELV) means voltage of 50V or less (AC RMS), or 120V or less (ripple-free DC). Low voltage (LV) means voltage greater than ELV, but not more than 1000V (AC RMS) or 1500V (ripple-free DC).

What is line in line out and loop in loop out?

LILO is Line In Line Out & Loop In Loop Out. * If a new EHV substation is inserted between two existing substaions, the transmission line for new inserted EHV substation is called LILO i.e. Line In Line Out. * When a transmission line is passing nearby to a substation or generation station to tap it, the system used is called LILO.

What is loop-in-loop-out (LILO)?

The tapping is done by Loop-In-Loop-Out (LILO) arrangement by providing slack jumpers with the existing transmission line. the general arrangement is shown in the following sketch- Fig. 6-1.

What are LoopLoop flows and why are they bad?

Loop Flows are difficult to control and can damage transmission equipment. Sometimes, the only way for a grid operator to prevent damage is to declare an emergency and cut power flows through the interconnection. Back To Wholesale Price Spikes: June 1998

How to tap an existing transmission line?

The tapping is done by Loop-In-Loop-Out (LILO) arrangement by providing slack jumpers with the existing transmission line. the general arrangement is shown in the following sketch- Fig. 6-1. The following precautions are necessary while tapping any transmission line-