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Chapter 8: Q1CSQ (page 537)

What are the components of GIS?

Short Answer

Expert verified

The current is controlled by the PWM converter in the type 4 generator.

Step by step solution

01

Define the gas insulated substation.

The GIS is defined as gas insulated substation is the substation that operates at high voltage such that all the major components of the substation are placed in a sealed environment. The sealed components are subjected to the SF6 gas that works as the insulation.

02

Determine explanation for the answer.

Consider the components of the GIS substation are as follows:

(1) The air entrance bushing

(2) Power cables for connections

(3) The transformer connections

(4) Busbars

(5) Switchgears like circuit breaker, surge arrestor and the earthing switches

(6) Instruments like current and voltage transformers

Therefore, the components of the GIS are explained

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Most popular questions from this chapter

Figure 8.26 shows a single-line diagram of a three-phase, interconnected generator-reactor system, in which the given per-unit reactances are based on the ratings of the individual pieces of equipment. If a threephase short-circuit occurs at fault point, obtain the faultMVA and fault current in kAif the prefault busbar line-to-line voltage is 13.2kV. Choose as the baseMVA for the system.

As shown in Figure 8.25, a balanced three-phase, positive-sequence source with VAB=480∠0°volts is applied to an unbalancedΔ load. Note that one leg of the D is open. Determine (a) the load currents IABand IBC; (b) the line currents IA,IBand IC, which feed theΔ load; and (c) the zero-, positive-, and negative-sequence components of the line currents.

Using the operatora=1∠120°, evaluate the following in polar form: (a)(a-1)/(1+a-a2), (b)(a2+a+j)/(ja+a2), (c) (1+a)(1+a2) and (d) (a-a2)(a2-1).

Calculate the source currents in Example 8.6 without using symmetrical components. Compare your solution method with that of Example 8.6. Which method is easier?

Reconsider the synchronous generator of Problem 8.36. Obtain sequence network representations for the following fault conditions.

(a) A short-circuit between phasesb and c.

(b) A double line-to-ground fault with phase’sb andc grounded.
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