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EE544 Distribution 1

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C3 b' 13800 kV. 287 KVA 0.0.87 pf lag. 221 KVA 0.9 pf lag. 732 KVA 0.82 pf lag. 618 KVA 0.874 pf lag ... b' 13800 kV. 287 KVA 0.0.87 pf lag. 221 KVA 0.9 pf lag ... – PowerPoint PPT presentation

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Title: EE544 Distribution 1


1
EE544 Distribution 1
  • Distribution Feeder Analysis
  • Regulation of Voltages

2
Feeder Analysis
  • Feeder Analysis
  • Voltage Regulation

3
Feeder Analysis
  • Examples will use following Data

4
Feeder Analysis
  • Examples will use following Data

5
Feeder Analysis
287 KVA 0.0.87 pf lag
5
C3 b
Sub
C1 5000 C1 5000
2
3
1
C3 a
618 KVA 0.874 pf lag
13800 kV
732 KVA 0.82 pf lag
Source impedance j0.005 pu
4
221 KVA 0.9 pf lag
6
Feeder Analysis
YOH12 YS
-YOH12
YOH12 YOH23 Yuga25 Yuga24
-YOH12
-Yuga24
-YOH12
-Yugb25
YOH23
-YOH12
Yuga24
-Yuga24
Yugb25
-Yugb25
7
Feeder Analysis
VSa/Zs VSb/Zs VSc/Zs -(S2a/V2a).
-(S2a/V2a) I -(S2a/V2a) . .
.
8
Feeder Analysis
VSa/Zs VSb/Zs VSc/Zs -(S2a/V2a).
-(S2a/V2a) I -(S2a/V2a) . .
.
V Z I
9
Feeder Analysis
VSa/Zs VSb/Zs VSc/Zs -(S2a/V2a).
-(S2b/V2b) I -(S2c/V2c) . .
.
V Z I
deg
V
10
Feeder Analysis
Current and power in branch 2-3
11
Feeder Analysis
At source
12
Voltage Control and Regulation
Capacitor banks Relatively Inexpensive -
Provide voltage rise - Reduce current when
properly located - Release capacity - Provide
Transmission Support The capacitor application
problem - Location - Size Minimize A1
Capital cost A2 PW of Loss - A3
Released Capacity Credit
13
Voltage Control and Regulation
Capacitor banks (Shorts Handbook)
14
Voltage Control and Regulation
Capacitor banks Ideally correct at source of
problem, i.e., Load - too many banks
expensive Typically locate 3-phase banks along
primary and 3 phase laterals - Uniform Primary
ROT 2/3 VARS 2/3 down from sub - Fixed Banks -
Switch banks typically oil or vacuum switch
OH or padmount - Radio controlled from
Distribution Control System - Time
controlled - Voltage Switched Requires PT -
Current Switched Requires CT - Reactive
Current Switched - Watch CT location -
Coordination
15
Voltage Control and Regulation- Capacitors
Capacitor banks Ideally correct at source of
problem, i.e., Load - too many banks
expensive Typically locate 3-phase banks along
primary and 3 phase laterals - Uniform Primary
ROT 2/3 VARS 2/3 down from sub - Fixed Banks -
Switch banks typically oil switch OH or
padmount - Radio controlled from Distribution
Control System - Time controlled - Voltage
Switched Requires PT - Current Switched
Requires CT - Reactive Current Switched -
Watch CT location - Coordination
16
Voltage Control and Regulation- Capacitors
287 KVA 0.0.87 pf lag
5
618 KVA 0.874 pf lag
C3 b
Sub
C1 5000 C1 5000
2
3
1
  • 600 KVAR bank here
  • Good voltage rise
  • Overcompensates
  • May even increase loss

C3 a
13800 kV
  • 600 KVAR bank here
  • Moderate voltage rise
  • Less Overcompensates
  • Does not decrease loss
  • here

732 KVA 0.82 pf lag
Source impedance j0.005 pu
4
221 KVA 0.9 pf lag
17
Voltage Control and Regulation- Capacitors
18
Voltage Control and Regulation- Capacitors
19
Voltage Control and Regulation- Capacitors
Note improved voltage profile Capacitor at bus 2
or 3 has same effect on Bus 2 Capacitor at 3
gives additional rise at bus 3 Losses stay the
same Bus 3 is the better loacation
Phase a voltage magnitudes At nodes 1 2 and
3 Without cap VAold Cap. At bus 2
Vcap_at2 Cap At bus 3 -- VA
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