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Power System Analysis and Design

Mulukutla S Sarma, J D Glover, Thomas Overbye

Computer Science

6th Edition · 925 pages

ISBN: 9781305632134

Chapter 3: Q3CSQ (page 158)

What should be the focus of transformer preventive maintenance efforts?

Short Answer

Expert verified

The moisture level, cooling system, temperature, and oil leakages are some preventive maintenance efforts to maintain the transformer.

Step by step solution

01

Transformer maintenance.

All the tests should be made before the installation of the transformer. The transformer’s life depends on its maintenance of the transformer. It should be checked on a time base, and required changes should also be made.

02

Transformer preventing maintenance efforts.

The insulation of all the transformer parts should work correctly and avoid leakages. The moisture level should be checked daily to prevent the excessiveness of the moisture content and maintain the moisture level at an acceptable level. The transformer should be dry to improve the aging the transformer. The silica gel plays an important role in maintaining the moisture to an acceptable level because it indicates the moisture level.

The temperature should not be increased to a predefined level by the manufacturer. Therefore, the functioning of the cooling system must be proper.

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Most popular questions from this chapter

Reconsider Problem 3.64 with the change that now $T_{b}$ includes both a transformer of the same turns ratio as $T_{a}$ and a regulating transformer with a $4 °$ phase shift. On the base of $T_{a}$ the impedance of the two components of $T_{b}$ per unit. Determine the complex power in per unit transmitted to the load through each transformer. Comment on how the transformers share the real and reactive powers.

It is stated that

(i) balanced three-phase circuits can be solved in per unit on a per-phase basis after converting-load impedances to equivalent Y impedances.

(ii) Base values can be selected either on a per-phase basis or on a three phase basis.

(a) Both statements are true.

(b) Neither is true.

(c) Only one of the above is true.

Consider the single-line diagram of a power system shown in Figure 342 With equipment ratings given:

Generator $G_{1}$ $50 M V A, 13.2 k V, x = 0.15 p . u$

Generator $G 2$ $20 M V A, 13.8 k V, x = 0.15 p . u$

Three-phase $Δ - Y$ transporter $T_{1}$ : $80 M V A, 13.2 Δ / 165 Y k V, X = 0.1 p . u$

Three-phase $Y - Δ$ transformer $T_{2}$ : $40 M V A, 165 Y / 13.8 Δ k V, X = 0.1 p . u$

Load: $40 M V A, 0.8 P F$ lagging, operating at

$150 k V A$

Choose a base of 100 MVA for the system and 132-kV base in the transmission-line circuit. Let the load be modeled as a parallel combination of resistance and inductance Neglect transformer phase shifts. Draw a per-phase equivalent circuit of the system showing all impedances in per unit.

Rework Problem 3.14 if the transformer is delivering rated load at rated secondary voltage and at (a) unity power factor, (b) 0.8power factor leading. Compare the results with those Of Problem 3.14.

An infinite bus, which is a constant voltage source, is connected to the primary of the three-winding transformer Of Problem 3.53. A $7.5 - M V A, 13.2 k V$ synchronous motor with a sub transient reactance of 0.5 per unit is connected to the transformer secondary. A localid="1656746464858" $5 M W, 2.3 k V$ , three- phase resistive load is connected to the tertiary. Choosing a base of localid="1656746481214" $66 k V$ and localid="1656746490341" $15 M V A$ in the primary, draw the impedance diagram of the system showing per-unit Neglect transformer exciting current, phase shifts, and all resistances except the resistive load.

Problem 3.53

The ratings of a three-phase, three-winding transformer are

Primary: Y connectedlocalid="1656746552467" $66 k V, 15 M V A$ ,

Secondary: localid="1656746559217" $Y$ connectedlocalid="1656746566136" $13.2 k V, 10 M V A$ ,

Tertiary: localid="1656746571916" $Δ$ connectedlocalid="1656746577941" $2.3 k V, 5 M V A$ ,

Neglecting resistances and exciting current, the leakage reactance’s are:

localid="1656746584806" $X_{P S} = 0.09$ per unit on alocalid="1656746592283" $15 M V A, 66 k V$ base

localid="1656746599787" $X_{P T} = 0.08$ per unit on alocalid="1656746606719" $15 M V A, 66 k V$ base

localid="1656746614327" $X_{S T} = 0.05$ per unit on alocalid="1656746620958" $10 M V A, 13.2 k V$ base

Determine the reactance’s of the per-phase equivalent circuit using a base oflocalid="1656746628095" $15 M V A,$ and localid="1656746635563" $66 k V$ for the primary.

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