PotashCorp – New Brunswick Division Picadilly Potash ... · PDF fileconnected from the bank star point to ... as well for simulating capacitor discharge ... The model was run at

Serving you since

1948

ATP Simulation – Picadilly Potash Project

Power Survey International Inc. Tel. :(514)333-8392 7880, Trans-Canada Hwy Fax :(514)333-8395 St-Laurent, QC e-mail: [email protected] H4T 1A5 Web site : www.powersurvey.com

Page 1 of 24

PPoottaasshhCCoorrpp –– NNeeww BBrruunnsswwiicckk DDiivviissiioonn PPiiccaaddiillllyy PPoottaasshh PPrroojjeecctt

TTrraannssiieenntt SSiimmuullaattiioonn

Prepared by: Carlos Reinel

Senior Engineer R&D Department

Power Survey International Approved by:

Pierre Archambault, PEng. VP Engineering

Power Survey International Inc.

30 September 2009

Serving you since

1948



Page 2 of 24

TTAABBLLEE OOFF CCOONNTTEENNTTSS

1. GENERAL 1.1 Purpose of this Study 1.2 Data Available 2. RESULTS 2.1 ATP Model 2.2 Filter 1 Step 1 Switching 2.3 Filter 1 Step 2 Switching 2.4 Filter 3 Step 1 Switching 2.5 Filter 3 Step 2 Switching 2.6 Filter 3 Step 3 Switching 2.7 Voltage Transients 2.8 Transient Spill-Over of Filter 3 to Filter 1 2.9 Conclusions

Serving you since

1948



Page 3 of 24

11.. GGEENNEERRAALL

11..11 PPuurrppoossee ooff tthhiiss SSttuuddyy The purpose of this study is to check transient currents and voltages in the new HV filters. This study is based on available data as indicated in the next section. The system simulation has been performed using the ATP transient simulation software.

11..22 DDaattaa AAvvaaiillaabbllee Following files and documents were available: Penobsquis VFD MCCs.pdf Motor List Picadilly VFD MCCs.pdf Motor List Load Distribution for Cap Banks Pic and Pen.xls Excel Spreadsheet PSMV1003-1.dwg Drawing # 130-20-10000 PSMV1003-1.dwg Drawing # 130-20-10001 PSMV1003-2.dwg Drawing # 130-20-10002 320-20-41201%20R1_6142-1.pdf System Layout

Serving you since

1948



Page 4 of 24

NNeeww FFiilltteerrss The new filters were simulated using following data: FILTER BANKS 1,2

Step1

Nominal 2000 KVAR

Effective 2011 KVAR @ 13.8 KV

C 26.74 µF / ph

C 6x500.06 KVAR @ 9.96 KV

XL 4.490 Ohms

N 4.70 H

Step2

Nominal 2000 KVAR


C 27.86 µF

C 6x500.73 KVAR @ 9.96 KV

XL 2.199 Ohms

N 6.58 H

FILTER BANKS 3, 4, 5

Step1

Nominal 2500 KVAR


C 35.00 µF

C 6x600.45 KVAR @ 9.54 KV

XL 3.431 Ohms

N 4.70 H

Step2

Nominal 2500 KVAR


C 35.00 µF

C 6x600.39 KVAR @ 9.54 KV

XL 1.751 Ohms

N 6.58 H

Step3

Nominal 2500 KVAR


C 34.98 µF

C 6x600.07 KVAR @ 9.54 KV

XL 0.706 Ohms

N 10.34 H

Serving you since

1948



Page 5 of 24

AACC LLooaaddss Lump load resistors and reactors were included to represent actual loads. AC loads have been condensed in five groups: Switchgear Load / Switchgear XR [Ohms] L [mHy] SWGR 305 9465 KW, 6730 KVAR 20.12 75.06

SWGR 306 9278 KW, 7128 KVAR 20.53 70.87

SWGR 1007 8026 KW, 5916 KVAR 23.73 85.39

SWGR 1005 9512 KW, 5912 KVAR 20.02 85.45

SWGR 1006 11056 KW, 6593 KVAR 17.23 76.62

Loads above were obtained from the ETAP model; refer to the ETAP Report as per Picadilly.SimulationReport.R2 (2009-09-16).doc file. Impedance values on columns three and four where calculated from the kW and kVAR values in the second column.

Serving you since

1948



Page 6 of 24

22.. RREESSUULLTTSS 22..11 AATTPP MMooddeell The 3-ph filter model includes stray capacitances to ground, neutral stray capacitance to ground as well as internal power cabling inductance:

F1S2L1

N V

F1S2L2

I I

F1S2L3

I

999 MOhm s

26.76 uF

6.07 mH

25uH

0.1 m Ohm

10 nF

FILTER1 STEP2

7.5 nF

50 m Ohms

100 k

100 MOhms

7.5 nF

With: Capacitances to Ground : 7.5 nF at line and load side on switches Switch Contact Resistance : 100 MOhms when switch open Switch Contact Capacitance : 1 nF Neutral to Ground Capacitance : 10 nF Reactor Resistance : 50 mOhms Cable Inductance : 25 µH Note : model above for switching steps only!

Serving you since

1948



Page 7 of 24

The floating neutral of the filter banks is represented by a 999 MOhms resistor connected from the bank star point to ground. Shunt resistors across the capacitors are also considered. These resistors are needed for numerical stability reasons (ATP requires often shunt resistors on capacitors as to avoid numerical jitter during sampling), as well for simulating capacitor discharge resistors. A 25 µH / ph reactance representing power cabling and busses within the filter section is included. The connected (steady, non-switching) filters were simulated using following simplified (typical) circuit:

F3S1

IFILTER3 STEP1

Two 5 km long 138 kV HV transmission lines and two 500m 13.8 kV power cabling from the secondary side of the main power transformers T303 and T304 are included. The model was run at 1µs sampling time for a total calculation time range of 1 s. Inrush transients caused by the switches closing contacts were thus calculated with very good dynamic definition. Switching sequence: considered is the natural switching sequence Step 1 (first) to Step 3 (last).

Serving you since

1948



Page 8 of 24

AATTPP CCiirrccuuiitt

0L

VL

CC

LC

C

F1

S2

L1

LD

2

I

N

LC

C

V

LD

3

I

LD

1

I

F1

S2

L2

I

I

F1

S2

L3

I F1

S2

L3

F3

S1

I

BC

T

YBC

T

Y

F3

S2

I

F3

S3

I

F1

S1

L1

LD

4

I

F4

S1

I

F4

S2

I

F4

S3

I

F2

S1

I

F2

S2

I

LD

5

I

F5

S1

I

F5

S2

I

F5

S3

I

XX

00

80

F1

S1

L2

I

I

F1

S1

L3

I F1

S1

L3

XX

00

77

XX

00

33

XX

00

64

XX

00

63

99

9 M

Oh

ms

26

.76

uF

6.0

7 m

H

25

uH

50

0 m

5 k

m

0.1

mO

hm

10

nF

FIL

TE

R1

ST

EP

2

7.5

nF

FIL

TE

R3

ST

EP

1

LO

AD

3:

80

26

KW

FIL

TE

R1

ST

EP

1

FIL

TE

R2

ST

EP

1

LO

AD

1:

94

65

KW

59

16

KV

AR

FIL

TE

R3

ST

EP

2F

ILT

ER

3 S

TE

P3

T3

03

67

30

KV

AR

13

8 k

V

T3

04

UT

ILIT

Y

SG

R3

05

50

mO

hm

s

10

MO

hm

s

10

0 k

FIL

TE

R4

ST

EP

1

LO

AD

4:

95

12

KW

59

12

KV

AR

FIL

TE

R4

ST

EP

2F

ILT

ER

4 S

TE

P3

13

.8 k

V

LO

AD

2:

92

78

KW

71

28

KV

AR

FIL

TE

R2

ST

EP

2

99

9 M

Oh

ms

FIL

TE

R5

ST

EP

1

LO

AD

5:

11

05

6 K

W6

59

3 K

VA

RF

ILT

ER

5 S

TE

P2

FIL

TE

R5

ST

EP

3

26

.74

uF

11

.91

mH2

5u

H

0.1

mO

hm

10

nF

7.5

nF

50

mO

hm

s

10

MO

hm

s

10

0 k

13

.8 k

V

10

0 M

Oh

ms 7.5

nF

10

0 M

Oh

ms 7

.5 n

F

Serving you since

1948



Page 9 of 24

FFiilltteerr 11 ((DDeettaaiill))

0L

VL

CC

LC

C

F1

S2

L1

N

V

LD

1

I

F1

S2

L2

I

I

F1

S2

L3

I

BC

T

Y

F1

S1

L1

F1

S1

L2

I

I

F1

S1

L3

I

99

9 M

Oh

ms

26

.76

uF

6.0

7 m

H

25

uH

50

0 m

5 k

m

0.1

mO

hm

10

nF

FIL

TE

R1

ST

EP

2

7.5

nF

FIL

TE

R1

ST

EP

1

LO

AD

1:

94

65

KW

T3

03

67

30

KV

AR

13

8 k

V

UT

ILIT

Y

50

mO

hm

s

10

MO

hm

s

10

0 k

99

9 M

Oh

ms

26

.74

uF

11

.91

mH25

uH

0.1

mO

hm

10

nF

7.5

nF

50

mO

hm

s

10

MO

hm

s

10

0 k

13

.8 k

V

10

0 M

Oh

ms

7.5

nF

10

0 M

Oh

ms 7

.5 n

F

Serving you since

1948



Page 10 of 24

FFiilltteerr 33 ((DDeettaaiill))

F3

S3

L1

F3

S3

L2

S3

L1

I

S3

L2

I

S3

L3

F3

S3

L3

I

F3

S2

L1

F3

S2

L2

S2

L1

I

S2

L2

I

S2

L3

F3

S2

L3

I

F3

S1

L1

F3

S1

L2

S1

L1

I

S1

L2

I

S1

L3

F3

S1

L3

I

99

9 M

Oh

ms

35

uF

1.8

8 m

H

25

uH

0.1

mO

hm

10

nF

FIL

TE

R3

ST

EP

3

7.5

nF

50

mO

hm

s

10

0 k

10

0 M

Oh

ms

99

9 M

Oh

ms

7.5

nF

35

uF

4.6

4 m

H

25

uH

0.1

mO

hm

10

nF

FIL

TE

R3

ST

EP

2

7.5

nF

FIL

TE

R3

ST

EP

1

50

mO

hm

s

10

0 k

99

9 M

Oh

ms

35

uF

9.1

mH25

uH

0.1

mO

hm

10

nF

7.5

nF

50

mO

hm

s

10

0 k

10

0 M

Oh

ms

7.5

nF

10

0 M

Oh

ms

7.5

nF

Serving you since

1948



Page 11 of 24

22..22 FFiilltteerr 11 SStteepp 11 SSwwiittcchhiinngg Ph-A closes at t = 1ms, ph-B at 2 ms and ph-C at 3 ms

Step 1 Reactor Currents, Time Range 0-1 s:

(f ile picadilly .00.pl4; x-v ar t) c:XX0080-F1S1L1 c:XX0079-F1S1L2 c:XX0078-F1S1L3

0.0 0.2 0.4 0.6 0.8 1.0[s]-600

-400

-200

0

200

400

600

[A]

Step 1 Reactor Currents, Time Range 0-25 ms:


0 5 10 15 20 25[ms]-600

-400

-200

0

200

400

600

[A]

Serving you since

1948



Page 12 of 24

CCoommmmeennttss The reactor current results show maximum 1-cycle RMS inrush currents of about 505/√2 Amps = 430% rated reactor current. The total transient period of about 1 second assuming XR = 50 mOhms. Note: Step 1 transients (above) include spill-over transients of Step 2 switching on at t = 0.5 s Note: the switching time of Step 2 had to be simulated very early (at t = 0.5 s), due to ATP calculation time restrictions.

Serving you since

1948



Page 13 of 24

22..33 FFiilltteerr 11 SStteepp 22 SSwwiittcchhiinngg Ph-A closes at 0.5 s, ph-B at 0.501 s and ph-C at 0.502 s



0.0 0.2 0.4 0.6 0.8 1.0[s]-600

-400

-200

0

200

400

600

[A]

Step 2 Reactor Currents, Time Range 0.5-0.52 s:


0.500 0.504 0.508 0.512 0.516 0.520[s]-600

-400

-200

0

200

400

600

[A]

Serving you since

1948



Page 14 of 24

CCoommmmeennttss The reactor current results show maximum RMS inrush currents of about 585/√2 Amps, about 508% rated reactor current. The total transient period of about 0.5 seconds considering XR = 50 mOhms could well be higher. There is no accurate data about XR at this point in time.

Serving you since

1948



Page 15 of 24

22..44 FFiilltteerr 33 SStteepp 11 SSwwiittcchhiinngg Ph-A closes at 1 ms, ph-B at 2 ms and ph-C at 3 ms


(f ile picadilly .03.pl4; x-v ar t) c:S1L1 -F3S1L1 c :S1L2 -F3S1L2 c :S1L3 -F3S1L3

0.0 0.2 0.4 0.6 0.8 1.0[s]-800

-600

-400

-200

0

200

400

600

800

[A]

Step 1 Reactor Currents, Time Range 0-25 ms:


0 5 10 15 20 25[ms]-800

-600

-400

-200

0

200

400

600

800

[A]

Serving you since

1948



Page 16 of 24




0.0 0.2 0.4 0.6 0.8 1.0[s]-800

-600

-400

-200

0

200

400

600

800

[A]



0.400 0.402 0.404 0.406 0.408 0.410[s]-800

-600

-400

-200

0

200

400

600

800

[A]

Serving you since

1948



Page 17 of 24




0.0 0.2 0.4 0.6 0.8 1.0[s]-1000

-750

-500

-250

0

250

500

750

1000

[A]



0.800 0.802 0.804 0.806 0.808 0.810[s]-1000

-750

-500

-250

0

250

500

750

1000

[A]

Serving you since

1948



Page 18 of 24

CCoommmmeennttss Step 1: Maximum reactor RMS current: about 668/√2 Amps = 430% In. Step 2: Maximum reactor RMS current: about 662/√2 Amps = 436 % In. Back to back switching on step 1! Step 3: Maximum reactor RMS current: about 1058/√2 Amps = 707% In. This high peak value is single occurrence, else similar values as for other steps! Back to back switching on steps 1 and 2!

Serving you since

1948



Page 19 of 24

22..77 VVoollttaaggee TTrraannssiieennttss

T303 Secondary Side, Time Range 0 – 0.05 s:

(f ile picadilly .00.pl4; x-v ar t) v :T303A v :T303B v :T303C

0 10 20 30 40 50[ms]-12

-8

-4

0

4

8

12

[kV]

T303 Secondary Side, Time Range 0.5 – 0.55 s:


0.50 0.51 0.52 0.53 0.54 0.55[s]-12

-8

-4

0

4

8

12

[kV]

Serving you since

1948



Page 20 of 24

T304 Secondary Side, Time Range 0 – 50 ms:


0 10 20 30 40 50[ms]-12

-8

-4

0

4

8

12

[kV]

CCoommmmeennttss Secondary voltage at T304 is clean from transients switching at the secondary side of T303. Voltage transients at the secondary side of T303 suffer from normal distortions during the switching of filters connected to the same bus. Some HF frequency ringing due to stray capacitances from busses to ground can be observed.

Serving you since

1948



Page 21 of 24

TTrraannssiieenntt VVoollttaaggee HHaarrmmoonniicc AAnnaallyyssiiss A FFT run on the T303 Ph-A voltage shows following harmonic contents at the end of the 1 second long transient period: MC's PlotXY - Fourier chart(s). Copying date: 9/30/2009File picadilly.00.pl4 Variable v:T303A [peak]

Initial Time: 0.98 Final Time: 1

0 5 10 15 20 25 30-2

0

2

4

6

8

10[kV]

harmonic order

CCoommmmeennttss Secondary voltages at T303 are sufficiently clean from major switching transients at the end of the 1 second long period. The decay after a few seconds later will be almost complete.

Serving you since

1948



Page 22 of 24

22..88 TTrraannssiieenntt SSppiillll--OOvveerr ooff FFiilltteerr 33 ttoo FFiilltteerr 11 Filter 3 on Filter 1, Ph-A currents (0-1s):

(f ile picadilly .03.pl4; x-v ar t) c:T303C -F1S1 c:T303C -F1S2

0.0 0.2 0.4 0.6 0.8 1.0[s]-200

-150

-100

-50

0

50

100

150

200

[A]

Filter 3 on Filter 1, Ph-A currents (0-80ms):


0 10 20 30 40 50 60 70 80[ms]-200

-150

-100

-50

0

50

100

150

200

[A]

Serving you since

1948



Page 23 of 24

Filter 3 on Filter 1, Ph-A currents (0.4-0.48 s):


0.40 0.41 0.42 0.43 0.44 0.45 0.46 0.47 0.48[s]-300

-200

-100

0

100

200

300

[A]

CCoommmmeennttss Transient spill-over to already connected filters introduce peak overloading of the filter reactors at about 250%. Transient spill-over to AC loads is of no major impact.

Serving you since

1948



Page 24 of 24

22..99 CCoonncclluussiioonnss This simulation shows no abnormal switching transients, providing there is no re-ignition or re-striking of the switches. Short-time dynamic overloading of the reactors of up to 480% can be expected. The simulation does not consider any additional effect of cabling other than the assumed HV power lines and cables as there is no available information at this point in time about cabling.

PotashCorp – New Brunswick Division Picadilly Potash ... · PDF fileconnected from the bank star point to ... as well for simulating capacitor discharge ... The model was run at

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