Low-tension equipment carries, is subjected to, or is capable of operating at a low voltage. The windings with the lower number of turns are called the low-tension windings. The ordinary induction or spark coil may be called an intermittent current transformer, since it transforms an intermittent low-tension primary current into an intermittent high-tension current. Low-tension equipment carries, is subjected to, or is capable of operating at a low voltage.
You need very high voltage for transmission on high-tension power lines. There exists a need for an insulator device for use on high-tension AC power lines that prevents the accumulation of particulate contaminants to reduce the likelihood of a flashover event. A high-tension cable carries more than 1000 Volts between conductors and 600 Volts between conductors and ground.