7/31/2019 Electric Power & Transmission & Distribution - NGR _ NGT Sizing

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ic Power & Transmission & Distribution - NGR / NGT Sizing

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Home > Forums > Electrical / Electronic Engineers >Activities> Electric Power & Transmission & Distribution Forum

NGR / NGT Sizingthread238-107399

skm (Electrical) 9 Nov 04 2:55

Can anyone help me with the guidelines for sizing the Neutral Grounding Resistor(NER) or Neutral

Grounding Transformer (NET).

Bye

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RalphChristie (Electrical) 9 Nov 04 4:31

It depends on what you're aim is with the resistance / impedance in the earth-path.

Do you want to protect you're equipment with smaller earth-fault currents? (Low resistance earthing)

Do you want to reduce step and touch potentials? (High resistance earthing) Do you want to obtain a

earth-point in a delta-system? (Earthing through a zig-zag trsf)

Combinations?

You have to decide how much ground fault current you want to allow and for how long.

For resistance earthed systems, the resistance of the resistors determine the ground-fault current.

You'll need to specify the resistance along with the duration how long they have to handle the current.

In a solidly-grounded system through a transformer (zig-zag trsf), the grounding transformer

impedance largely determines the ground fault current. You will need to specify the grounding

transformer impedance (normally in ohms) as well as how long the transformer must be able tohandle this current (normally 10 seconds).

In a combination of a zig-zag trsf and resistors the total resistance (impedance of trsf and resistance

of resistors) will determine the ground-fault current. You'll have to specify both + the duration of the

fault current.

You have to specify:

Operating voltage / BIL

Desired impedance / resistance in ohms

Max. short circuit current

Duration of Short circuit current

Max. continuous current

See also:

http:/ / ww w.postglover .com/ hand/ index.htm

Failure seldom stops us, it is the fear for failure that stops us - Jack Lemmon

Regards

Ralph

busbar (Electrical) 9 Nov 04 16:15

Circuit voltage, duty and location in the electrical system are not specified, but for ANSI regions there

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7/31/2019 Electric Power & Transmission & Distribution - NGR _ NGT Sizing

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ic Power & Transmission & Distribution - NGR / NGT Sizing

/www.eng-tips.com/viewthread.cfm?qid=107399&page=403[8/15/2011 2:50:55 PM]

Eng-Tips ForumsSWAG here!

is Chapter 1 {1.4.3+} in the IEEE green book, {Std 142-1991} that has some basic considerations

and references on forms of resistance grounding.

HF1 (Electrical) 14 Nov 04 19:05

You may want to study C62.92.1 thru .5

Hamid

RalphChristie (Electrical) 15 Nov 04 1:58

Hamid

In which code/standard is it?

Failure seldom stops us, it is the fear for failure that stops us - Jack Lemmon

Regards

Ralph

dpc (Electrical) 15 Nov 04 11:22C62 is an ANSI standard.

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