The type of connection generally used at the beginning of high tension transmission line is – (a) delta-delta (b) Start-star (c) star-delta (d) delta-star

By BYJU'S Exam Prep

Updated on: September 25th, 2023

The type of connection generally used at the beginning of high tension transmission line is delta-star. There is a very high voltage at the secondary side at the start of the high-tension transmission line. By utilizing a step-up transformer, this is accomplished. The primary side of the high-tension transmission line is a low voltage at the starting, and the secondary side has a high voltage.

Delta and star connections are ideal on the primary and secondary sides for this use.
because the line voltage is three times the phase voltage in a star connection.
As a result, insulating costs are reduced. Additionally, the price of insulation for the entire transmission line is decreased.

Table of content

1. The type of connection generally used at the beginning of high tension transmission line is – (a) delta-delta (b) Start-star (c) star-delta (d) delta-star

Type of Connection

Below are listed various connections and their corresponding transformers.

Connections	Applications
Delta primary, Delta Secondary	Low-power primary distribution
Star primary, Delta Secondary	Step down transformer
Delta primary, Star secondary	Step-up transformer
Star primary, Star secondary	Small high-voltage transformers

Mistake points

The secondary side connection also offers a reliable neutral point for loads in the secondary distribution network, making the delta-star connection the most cost-effective for step-up applications (transmission side). Both step-down (distribution side, low voltage) and step-up (transmission side, high voltage) applications are common in which the connector is used.

Summary: