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What is the cause for a blown fuse in one phase of primery
side(HV) of a three phase transformer( 4169v-460v) in the
time of closing its supply breaker.
There is no load on the secondery side of the transformer
in this moment.
- 3 Answers
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Answer Posted / engr.abdurrahim
As your Question, I think in your transformer is having
interturn fault or single phasing or may be LG
fault.Without load if any fuse blown means connected things
(Transformer)itself having problem.
Solution:
Do the Meggaring and check insulation between, phases at HV
side,LV side,
Check insulation between phase to neutral, Phase to earth.
Check Earth resistance also.
| Is This Answer Correct ? | 5 Yes | 2 No |
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WHAT IS DOL STARTER? HOW IT WORK? GIVE ITS CONTROL AND POWER DIAGRAM .
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.
