what is the purpose of supervision relay coil
Answer / c r satpathy
The trip circuit supervision relay is used for supervising important control circuits such as circuit-breaker
and disconnector control circuits and signalling circuits in power electrical installations. Generally one supervision relay is needed per circuit to be supervised. If several branches of a circuit are to be supervised, the required
number of relays can be connected to the same control circuit. Continuous monitoring of circuit-breaker trip circuits and other essential control circuits. Preset operate time preventing unwanted alarm signals at circuit-breaker operation
Is This Answer Correct ? | 0 Yes | 0 No |
What is OLTC AND RTCC and it's function?
What is corona ? Mention its positve effects .
Can anyone provide with a SLD for HT panel installation for a 33KV line and distribution end has three 1.5MV transformers. Is it suitable to use OCB or VCB and also provide me the suitable rating and its connection diagram.
Why only plate(copper) Earth pit given for neutral earthing? why not pipe(G.I) Earth pit?
How many earthings are provided for a 250KVA distribution transformer?
what are the shades for mimic diagram i.e for 3.3kv,6.6kv,11kv,22kv and 33kv? which is the IS for mimic diagram?
how can calculation ate Amps for cabel. Ex-for 1sqmm wire hou many amps we can draw
Why the Voltage rises when Leading Power Factor is occurs?
what modulation is used in landline telephone signals?
As we know induction squirrel cage motor torque Directly praprortinal to applied voltage in star connection & delta also. If I connect 55KW Motor to DOL starter in load condition does motor withstand the load & what will be the current withdrawn ? motor will not fail ?
1. A 380 / 220 V r.m.s. 3-phase 4-wire circuit carries loads of 8 + j8.1 ohm; 4 + j4.1 ohm; and 2 +j2.1 ohmin the three phases respectively. The length of the circuit is 100 m, and the resistivity of the phase conductors is 0.0005 Ω/m. The neutral conductor is of the same size as the phase conductors. a) Select a reference angle 0for the first phase. Then write down the three phase voltages in both polar format and complex number format. b) Make appropriate assumptions, and take temperature effects on resistance is insignificant. Calculate the currents in the three phases. (Note: Determine conductor resistance, and apply Kirchhoff’s Voltage Law) Based on the result, suggest a main switch rating for the circuit. c) Show your preferred direction of neutral current in a diagram, and then determine its value. (Note: Apply superposition principle, and Kirchhoff’s Current Law) Use its magnitude to show that in this circuit, the unbalanced load may increase the voltage drop in some of the phases. (Note: Also observe the common volt drip in neutral) State your assumptions, if there are any. d) Suddenly the neutral wire of the circuit is broken. Estimate the new currents in the first phase, i.e. Phase L1. State your assumptions, if there are any.
what is mean by dry frequency