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Which of the following is the correct use of 'delta/delta' connections?
- a)This connection is economical for HV transformers.
- b)This is used for smaller power systems.
- c)This is the best match for ultra HV transformers.
- d)This suits large LV transformers.
Correct answer is option 'D'. Can you explain this answer?
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Which of the following is the correct use of delta/delta connections?a...
Delta-Delta or Delta-Delta or ∆ − ∆ Connection:
This connection is economical for large, low-voltage transformers in which the insulation problem is not so urgent, because it increases the number of turns/phase.
The transformer connections and voltage triangles are shown in Fig.
- The ratio of transformation between primary and secondary line voltage is exactly the same as that of each transformer.
- Further, the secondary voltage triangle abc occupies the same relative position as the primary voltage triangle ABC i.e. there is no angular displacement between the two.
- Moreover, there is no internal phase shift between phase and line voltages on either side as was the case in Y − Y connection.
This connection has the following advantages:
- In order that the output voltage is sinusoidal, it is necessary that the magnetizing current of the transformer must contain a third harmonic component. In this case, the third harmonic component of the magnetizing current can flow in the ∆-connected transformer primaries without flowing in the line wires. The three phases are 120° apart which is 3 × 120 = 360° with respect to the third harmonic, hence it merely circulates in the ∆. Therefore, the flux is sinusoidal which results in sinusoidal voltages.
- No difficulty is experienced from unbalanced loading as was the case in Y − Y connection. The three-phase voltages remain practically constant regardless of load imbalance.
- If one transformer becomes disabled, the system can continue to operate in open-delta or in V − V although with reduced available capacity. The reduced capacity is 58% and not 66.7% of the normal value.
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Which of the following is the correct use of delta/delta connections?a)This connection is economical for HV transformers.b)This is used for smaller power systems.c)This is the best match for ultra HV transformers.d)This suits large LV transformers.Correct answer is option 'D'. Can you explain this answer?
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