Power Quality

Anonymous
timer Asked: Feb 8th, 2019
account_balance_wallet $20

Question Description

I need someone to help me to solve 8 questions about power quality ( ITI Curve, Voltage Sag Mitigation Devices, Voltage Dip during Motor Starting, Lightning, capacitor switching......

Please I need you to solve all the questions and show how did you solve it? And please don’t copy from online (chegg)....

Thanks

Tutor Answer

seniorlecturerken
School: UCLA

Hey Buddy. I have managed to solve the problems. Kindly go through them and let me know if there are any edits or clarifications needed. See the attachments below.

The attachment named “Power Quality – Solutions” contains solutions to the exercises.


QUESTION ONE

Solution
Consider the table below;
Date
01-Nov
03-Apr
May-27
Jun-14
Jun-17
Aug-15
Aug-28
Sep-17

Time off
13:16:27
01:38:31
16:18:03
19:06:42
11:26:17
07:24:07
04:31:02
09:21:12

Time on
14:24:46
01:39:01
16:18:33
22:14:29
11:26:47
07:32:48
04:31:32
11:47:36

Customers
250
650
2000
75
2000
2000
300
50

KVA
690
510
6840
240
5260
4120
280
170

Sustained/Momentary
Sustained
Momentary
Momentary
Sustained
Momentary
Sustained
Momentary
Sustained

Duration (Minutes)
68.32
0.5
0.5
187.78
0.5
8.68
0.5
146.4

Customer minutes
17080
325
1000
14083.5
1000
17360
150
7320

a) SAIDI = Total duration of sustained interruptions in a year / total number of consumers
= (17080+14083.5+17360+7320)/2000
= 27.923 minutes

b) SAIFI = (Total number of sustained interruptions in a year) / (Total number of
consumers)
= (250+ 75 + 2000 + 50)/2000= 1.1875

c) CAIDI = SAIDI/SAIFI = 27.923/1.1875=23.514 Minutes

d) SAIDI would get worse (increase). This is so because a fuse blowing strategy would
always lead to sustained interruptions which in turn increases the total of sustained
interruptions in a year.

SAIFI would eq...

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Anonymous
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