# What are the standard transmission and distribution voltages?

## What are the standard transmission and distribution voltages?

Electrical Transmission and Distribution Systems That network consists of electrical distribution substations which step-down the transmission line voltage levels between 69 kV and 765 kV to distribution voltage levels, usually 35 kV or less. Typical distribution voltages range from 34,500Y/19,920 V to 4,160Y/2400 V.

## What are distribution voltages?

Distribution Voltages Primary lines have voltages ranging from 2,300 to 39,000 volts. Common primary line voltages are 2,300, 4,160, 12,470, 13,800, 25,000 and 34,500 volts depending on which distribution voltages a utility uses. Common secondary line voltages are 120, 208, 240, 277 and 480 volts.

What voltage are street power lines?

Transmission lines carry high voltage electricity, typically at 345,000 volts, over long distances between the power generation plant and customers. In some cases, a large industrial customer may receive electricity directly from overhead transmission lines.

### Is 13.8 kV High voltage?

If the distances from the main utility substation of the campus to the individual buildings are great, higher voltages could be used, but the 13.8-kV distribution system is very common. Other common voltages are 12.47 kV, 24 kV, and 24.9 kV (nominally 25 kV).

### Is 34.5 kV High voltage?

But higher voltage circuits can use smaller conductors. The main savings of higher-voltage distribution is fewer substations. Higher voltage systems also have lower annual costs from losses….Table 1 – Power Supplied by Each Distribution Voltage for a Current of 400 A.

System Voltage (kV) Total Power (MVA)
34.5 23.9

Is 12 kV high voltage?

High voltage is defined as any voltage over 1000 volts. Those of 2 to 33 kV are usually called medium voltage cables, those over 50 kV high voltage cables.

## How do you identify 33kV?

In a transmission line, if three pieces of disc insulators per phase are connected, then the KV of the transmission line is 33KV.

Is 33kV a transmission voltage?

Many people question why the voltage is as high as 33kV in the first place. The reason is that the higher the transmission voltage, the lower the transmission losses will be. 33kV lines on the other hand involve much higher voltages and are used to distribute power from one small sub-station to another.

### What are the different types of subtransmission voltages?

Common subtransmission voltages include 34.5, 69, 115, and 138 kV. Higher voltage subtransmission lines can carry more power with less losses over greater distances. Distribution circuits are occasionally supplied by high-voltage transmission lines such as 230 kV; such high voltages make for expensive high-side equipment in a substation.

### What is a subtransmission line?

Transmission lines (towers) Subtransmission systems are those circuits that supply distribution substations. Several different subtransmission systems can supply distribution substations. Common subtransmission voltages include 34.5, 69, 115, and 138 kV. Higher voltage subtransmission lines can carry more power with less losses over greater

What is a sub transmission line power?

Subtransmission Lines. Subtransmission Lines carry voltages that are typically between 26kV and 69kV to regional distribution substations, that is, to substations that distribute power across a geographic region. Two subtransmission line towers are shown in Figure 4.

## What is a transmission substation?

A transmission substation decreases the voltage of incoming electricity, allowing it to connect from long-distance high voltage transmission, to local lower voltage distribution. It also reroutes power to other transmission lines that serve local markets.