# What Is LV And HV?

## What is classed as High Voltage?

define high voltage as above 1000 V for alternating current, and at least 1500 V for direct current.

In the United States, the National Electrical Manufacturer’s Association (NEMA) defines high voltage as over 100 to 230 kV..

## Is 480v AC or DC?

The voltage between either of the actives and the neutral is 240V while the voltage between the two active conductors is 480V. It is the a.c. equivalent of the three-wire d.c. system. It facilitates the supply of larger loads or loads at greater distances from the transformer than the single-phase 2-wire system.

## How many volts is a 3 phase?

208 voltsFor three phase, you connect line 1 to line 2 and get 208 volts. At the same time you [can] connect line 2 to line 3 and get 208 volts.

## How many windings does a 3 phase motor have?

The motor stator has at least three main field windings on the salient teeth to form either two or four poles, with the teeth being equal in number to at least three times the number of the poles.

## What is HV and LV windings?

The HV winding is placed around the LV. The HV winding is provided with the tap changer to maintain the desired voltage. If the high voltage(HV) winding is placed near the core, the more insulation is needed to insulate the high voltage winding of the transformer and the core.

## Why LV winding is near to core?

LV winding is placed nearer to core as the amount of insulation required to isolate LV from core is less as compared when you place HV nearer to core. So overall cost of insulation & hence transformer manufacturing cost reduces.

## What is the difference between low and high voltage?

Home Voltage As rated by the IEC, home electrical wiring is considered low voltage. However, housing voltage, which is from 100 to 250 VAC, is considered high voltage for home owners. Consequently, 5 to 24 volt devices are considered low voltage in homes.

## What is a 240 volt?

240-volt outlets use two 120-volt wires simultaneously, plus a neutral wire to power a single receptacle. … Older homes and appliances may use three-prong 240-volt outlets. However, modern outlets and appliances use a ground wire too, which means modern 240-volt plugs have four prongs.

## What are the different voltage levels?

Classification of Electrical ServicesLow Voltage: 1000 volts or less.Medium Voltage: greater than 1000 volts and less than 100 kV.High Voltage: greater than 100 kV and equal to or less than 230 kV.Extra-High Voltage: greater than 230 kV but less than 1000 kV.Ultra-High Voltage: equal to or greater than 1000 kV.

## What is window space factor?

Explanation: Window space factor is the ratio of the copper area in the window to the total window area. It is a constant used in the output equation of transformers.

## What is core type and shell type transformer?

In core type transformer both the primary and the secondary windings are placed on the side limbs whereas, in shell type transformer, the windings are placed on the central limbs of the transformer. The core type transformer has two magnetic circuits whereas the shell type transformer has one magnetic circuit.

## What is low voltage winding in transformer?

[′lō ¦vōl·tij ′wīnd·iŋ] (electromagnetism) The coil of wire wound around the core of a power transformer which has the smaller number of turns, and therefore the lower voltage.

## How many windings does a motor have?

The most basic 3-phase induction motor has three sets of windings, with each phase connected to a differ- ent set of windings, Figure 16-4. The current in each winding is 120 electrical degrees out of phase with the urrent in the other windings.

## What are the types of windings?

Types of Motor WindingsStator Winding. The slot on stator core of the three-phase motor winding carries stator winding. … Rotor Winding. In a motor, the rotating part is known as the rotor. … Lap Winding. Lap winding is the one kind of armature winding. … Wave Winding.

## Can low voltage kill you?

Any voltage above 30 is generally considered to be capable of delivering dangerous shock currents. … Low voltages can still be dangerous even if they’re too low to directly cause shock injury. They may be enough to startle the victim, causing them to jerk back and contact something more dangerous in the near vicinity.

## What is HV and LV side of transformer?

The test is conducted on the high-voltage (HV) side of the transformer where the low-voltage (LV) side or the secondary is short circuited. A wattmeter is connected to the primary. An ammeter is connected in series with the primary winding. … The ammeter reading gives the primary equivalent of full load current IL.

## What are the three types of armature windings?

Types of Armature Winding of AlternatorSingle phase and poly phase armature winding.Concentrated winding and distributed winding.Half coiled and whole coiled winding.Single layer and double layer winding.Lap, wave and concentric or spiral winding and.Full pitched coil winding and fractional pitched coil winding.

## What does LV mean in electricity?

low voltageIn electrical engineering, low voltage is a relative term, the definition varying by context. Different definitions are used in electric power transmission and distribution, and electrical safety codes define “low voltage” circuits that are exempt from the protection required at higher voltages.