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Electrical Question.

Thus an “x” having a current element the torque of which is opposed by the torque of the Voltage element, can be arranged so that the trip current will close if the ratio E/I becomes less than the impedance of the section it is protecting.

What is it? What is “x”?

Clue. Z=E/I

0 whjohnson over 4 years ago

Too abstract for me pal - can you repost again in English please?
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0 David Stone over 4 years ago

The voltage is always present Z and is relatively constant but the current varies with the load, and so the torque balance cannot work as you suggest. An electronic version of your idea could work, but only because one can set the trip ratio directly, in other words, an I*V > than the maximum allowed, or the load impedance is too low. It would be less useful if the PF were also unknown. You are obviously thinking of some old-fashioned WattHour meter kind of arrangement using a Faraday disk. Here you would need to detect excess rotation speed.
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0 Zoomup over 4 years ago

Clue. It is an item detailed in a 1950s electrical book.

Z.
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0 Andy. over 4 years ago

Sounds like a HV distance protection relay KDGT?
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0 Former Community Member over 4 years ago
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Electrical Question.

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