atpdraw simulation of switching tl500kv-00

8/10/2019 ATPDraw Simulation of Switching TL500kV-00

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Chapter 6 Study Cases

6.1. Energization of 500kV Transmission Line

The purpose of this case study is to introduce PowerFactorys function for the analysis

of electromagnetic transient in power system. This case study includes single line diagram

network model, using transmission line tower configuration 500kV double circuit of EGAT,

running time-domain simulation plotting and interpreting the results compare to the

ATPDraw simulation.

Create new project in PowerFactory and set up the network configuration as in figure

above. The parameters will be discussed in the following, and some data referred to the

typical values for simulation only.

- Source: represent the Thevenins equivalent of network consist of some

transformers and other overhead line connected to the sending bus. Furthermore, this

equivalent circuit of external grid defined as Positive and Zero sequence with ideal source.

Typical valued here have been used for simulation.

Source impedance Positive sequence1 2 1 1

1.2283 23.4Z Z R jX j= = + = +

Source impedance Zero sequence0 0 0

5.3405 40.35Z R jX j= + = +

Source Voltage 500Vs kV line line voltage=

Xs Rs

500kV

325.6km

Double Circuit

Sending Bus Receiving Bus

Figure 6.1 Single line diagram for case study on 500kV line switching


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- Circuit Breaker: Assume to be ideal switching with time controlled and 3-ph

switching at peak voltage of Phase A (time switching t = 10ms).

- Shunt Reactor: the 110MVAR, rated voltage 525kV reactive power Reactor will

be used to compensate this 500kV transmission line at both end of the line. The 3-phase

Shunt Reactor connected with 0.55MVAR, rated voltage 110kV neutral reactor single phase.

2 2(525 )2505.682

110

Qrated

Rated

V kVXa

Q MVAr = = =

2505.6827.9758

2 2 50

XLa H

f = = =

@802.463

CRa

=

2 2(110 )22,000

0.55

Qrated

Cal

Rated

V kVXn

Q MVAr = = =

Measured Neutral Inductance 6.297Ln H= ;

2 50 6.297 1978.26meaXn = =

@8013.162

CRn

=

PowerFactory has option for Shunt reactor data such as Design Parameter or Layout

Parameter input. Quality Factor at nominal frequency is calculated by q.

2505.6821017.329

2.463

recrec

reac

Xqf

R= = =

Figure 6.2 Source Impedance for EMT-Simulation

Xn

Xa Xb Xc

A B C

Figure 6.3 Shunt Reactor Connection


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Shunt Reactor is connected at both end of the transmission line. The shunt reactor

winding assumed to be linear with 3 limb cores; any available data such as measurement

Figure 6.4 Basic Data input for Shunt reactor 3ph-YN connection

Figure 6.5 Basic Data input for Neutral Reactor


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capacitance (depend on shunt type model) can be made to be more detail data input for EMT-

simulation.

-Surge Arrester: Voltage-current (V-I) characteristic using peak values data from

ABB have been used. Stray capacitance and series inductance of the surge arrester data is not

available for this simulation.

Current peak (kA) Voltage peak (kV)

1.5 867

3 898

5 922

10 975

20 1,020

40 1,120

- Transmission Line: Overhead transmission line system herein defined in term of

geometrical data, i.e. the physical dimensions of the tower configuration and conductor data.

The model consists in conductor type (TypCon) and the tower type (TypTow).

The following procedure is used to calculate the parameter of the tower and

conductor. As the tower configuration as Double-Circuit, then the identical circuit data is

obtained from Figure 6.6.

-Circuit 1: X1 = 11.46 4.429 = 7.031 m

X2 = 10.67 4.429 = 6.241 m

X3 = 10.67 4.429 = 6.241 mY1 = 37 4.429 = 32.571 m

Y2 = 37 + 11 4.429 = 43.571 m

Y3 = 37 + 11 + 11 4.429 = 54.571 m ; Sag_phase = 18.06 m

Xg = 6.46 m ; Yg = 37 + 11 + 11 + 6 = 65 m ; Sag_OGW = 12.37 m

- Conductor: 41272 MCM, ACSR/GA is used , Doverall-ACSR = 33.91 mm

- Al Strand, DStrand= 4.42 mm, N = 42 , Rdc20 = 0.0449 /km

Table 6.1 Voltage-Current (V-I) characteristics of Surge Arrester 500kV, MOSA


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- Steel, Dsteel wire = 2.46 mm, N = 7, Doverall-Steel = 2.463 = 7.38

mm

- OGW : 13/8EHS, Doverall = 9.144 mm

- DCoated wire= 3.048 mm , N = 7 , Rdc20 = 4.307 /km1 13

4 433.91 10

13.22

phase phaseGMR r e e mm

= = =

1 13

4 43.144 10

3.562

OGW OGW GMR r e e mm

= = =

Figure 6.6 Tower Configuration mostly used for EGAT project after 2005


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The Double-Circuit of the Tower configuration is mad, but in this study case only one

circuit is going to be energized by other is not energized.

According to the calculation function can be used as stand-alone mode, and then the

single circuit will be calculated the impedance and admittance matrix result to the output

window or it can be automatically calculated in the EMT-Simulation page of the Tower type

(TypTow).

Figure 6.7 Result of impedance matrix of 012 sequences

Figure 6.8 Result of admittance matrix of 012 sequences


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Recall the impedance matrix

[ ]

0

012 1

2

0 0 2 0 0

0 0 0 0

0 0 0 0

s m

s m

s m

Z Z Z

Z Z Z Z

Z Z Z

+ = =

Figure 6.9 Impedance and Admittance matrix printed to output window


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0

1 2

0.213228 1.02712 /

0.0121045 0.264492 /

Z j km

Z Z j km

= +

= = +

0

1 2

0.00 2.59044 /

0.00 4.3694 /

Y j uS km

Y Y j uS km

= +

= = +

These parameters of transmission line will be used in the line element.

Figure 6.10 Basic Data for single circuit data transmission line 500kV

Figure 6.11 EMT-Data for single circuit data transmission line 500kV

atpdraw simulation of switching tl500kv-00

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