What is the Difference between restricted earth fault and earth fault?

Answer 1

short circuit and fault current are not related or comparable practically or mathematically. a short circuit is a break down in insulation causing contact between live/line conductors. fault current is different. it is measured in the value kA and is the benchmark as to whether your overcurrent device is adequate. this is determined by measurement or enquiry to the local provider.ohms law applies- I=V divided by R.

Answer 2

Restricted earth fault protection (REF) is a function available in some microprocessor based relays. In these relays, what this means is it is protection for earth faults within the protected zone, but will not operate for faults outside this zone. Hence, it is restricted.

Answer 3

NA fault is where there is a crack in the earth surface. Some faults push tward each other and others are pushed away. When this motion happens with the faults we call them earthquakes. NOT ALL Earthquakes are on faults but most are close to one

Answer 4

In a typical electrical circuit, current flows through the "hot" and "common" wire, or the two "hot" wires of a 240 circuit. In a condition such as that, an equal amount of electrical energy flows through both wires with one being the positive and the other being the negative. Naturally, since the power is alternating current, the positive and negative states are constantly changing.

As long as the current through one wire is identical to the current through the return wire, there is no earth fault or earth leakage.

In the case of a damaged appliance, the insulation on a field winding may become burned or otherwise damaged, causing leakage to the case of the appliance or otherwise "leak" current to earth (or ground). That is the leakage condition.

Specially designed safety devices have been created to protect from injury due to that kind of leakage.

The ground fault circuit interrupter (GFCI) constantly compares the current across the two wires and shuts down a circuit whenever an inequality exists that can potentially cause harm. When a GFCI detects the inequality, it's called a ground fault.

Answer 5

A restricted earth fault is a more sensitive protection scheme that detects faults within a specific zone of a power system, while an earth fault protection is a broader scheme that detects faults anywhere in the system. Restricted earth fault protection is often used to protect critical equipment such as Transformers, generators, or busbars.