TABLE OF CONTENTS Appendix E

(1)

E.1 Load profile...1

E.1.1 Section 21 ...2

E.1.1.1 Morning shifts ...2

E.1.1.2 Afternoon shifts ...4

E.1.2 Section 61 ...7

E.1.2.1 Morning shifts ...7

E.1.2.2 Afternoon shifts ...10

E.2 Histogram ...14

E.2.1 Section 21 ...15

E.2.1.1 Morning shifts ...15

E.2.1.2 Afternoon shifts ...16

E.2.2 Section 61 ...17

E.2.2.1 Morning shifts ...17

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APPENDIX E

CM TRAILING CABLES

The total consumption of a CM was measured at each section’s 1250 kVA flameproof

transformer, which supplies the CM with power. The present sustained capacity of the

CM trailing cable could thus be determined. Measurements were made on the supply

to the CM for a number of shifts as can be seen in Table E-1.

Table E-1: Measuring period for a CM at each section.

CM’s are supplied with power from the 1250 kVA flameproof transformer with a 95

mm

2

trailing cable that is generally 250 meters long. The cable is rated for a current of

295 A at an ambient temperature of 30 °C. The derating factor for an ambient

temperature of 25 °C is 1.1, which gives a current rating of 325 A for the cable.

E.1 LOAD PROFILE

The next section focuses on the load profiles of the CM’s. Each graph shows the line

voltage and the voltage limits, the load current and rated current capacity of the cable.

The morning shifts and afternoon shifts are separated as well as the measurements

made at the different sections.

17-May-2005 18-May-2005 19-May-2005 23-May-2005 24-May-2005 25-May-2005

Section 21 Morning shift

X

-

-tonnes/CM/shift

858 1320

1716

1320

1650

1749

Afternoon shift

X

-

-tonnes/CM/shift

2145

2112

2013

2310

1980

Section 61 Morning shift

-

X

tonnes/CM/shift

1740

2175

2233

1740

1450

2320

Afternoon shift

-

X

tonnes/CM/shift

1682

2552

2320

2030

2320

1160

(3)

Table E-2: Reasons for breakdowns and absent data.

Figure E.1-1: Load current and voltage for a CM – 17 May 2005.

0 200 400 600 800 1000 1200 6:30 7:30 8:30 9:30 10:30 11:30 12:30 1:30 2:30

Time (hh:mm)

Li

ne

V

ol

ta

ge

(V

)

0 100 200 300 400 500 600 700 800 900 1000

C

ur

re

nt

(A

)

Voltage (V) Voltage limit (upper) Voltage limit (lower) Current (A) Cable rating (A)

Date

Time start Time stop Reason for breakdown or no data

17-May-2005

SOS

EOS

No current data recorded - data recorder faulty.

18-May-2005

SOS

EOS

No current data recorded - data recorder faulty.

19-May-2005

07:20

08:25

CM trailing cable faulty.

(4)

Figure E.1-2: Load current and voltage for a CM – 18 May 2005.

Figure E.1-3: Load current and voltage for a CM – 19 May 2005.

0 200 400 600 800 1000 1200 6:30 7:30 8:30 9:30 10:30 11:30 12:30 13:30 14:30

Time (hh:mm)

Li

ne

V

ol

ta

ge

(V

)

0 100 200 300 400 500 600 700 800 900 1000

C

ur

re

nt

(A

)

Voltage (V) Voltage limit (upper) Voltage limit (lower) Current (A) Cable rating (A) 0 200 400 600 800 1000 1200 6:30 7:30 8:30 9:30 10:30 11:30 12:30 13:30 14:30

Time (hh:mm)

Li

ne

V

ol

ta

ge

(V

)

0 100 200 300 400 500 600 700 800 900 1000

C

ur

re

nt

(A

)

(5)

Figure E.1-4: Load current and voltage for a CM – 19 May 2005

(30 minute period).

E.1.1.2 Afternoon shifts

Table E-3: Reasons for breakdowns and absent data.

Date

Time start Time stop Reason for breakdown or no data

17-May-2005

SOS

EOS

No current data recorded - data recorder faulty.

18-May-2005

SOS

EOS

No current data recorded - data recorder faulty.

19-May-2005

22:42

EOS

No voltage data - recorder stopped recording.

0 200 400 600 800 13:30 13:35 13:40 13:45 13:50 13:55 14:00

Time (hh:mm)

Li

ne

V

ol

ta

ge

(V

)

0 100 200 300 400 500 600 700

C

ur

re

nt

(A

)

Current (A) Cable rating (A)

(6)

Figure E.1-5: Load current and voltage for a CM – 17 May 2005.

Figure E.1-6: Load current and voltage for a CM – 18 May 2005.

0 200 400 600 800 1000 1200 15:30 16:30 17:30 18:30 19:30 20:30 21:30 22:30 23:30

Time (hh:mm)

Li

ne

V

ol

ta

ge

(V

)

0 100 200 300 400 500 600 700 800 900 1000

C

ur

re

nt

(A

)

Voltage (V) Voltage limit (upper) Voltage limit (lower) Current (A) Cable rating (A) 0 200 400 600 800 1000 1200 15:30 16:30 17:30 18:30 19:30 20:30 21:30 22:30 23:30

Time (hh:mm)

Li

ne

V

ol

ta

ge

(V

)

0 100 200 300 400 500 600 700 800 900 1000

C

ur

re

nt

(A

)

(7)

Figure E.1-7: Load current and voltage for a CM – 19 May 2005.

Figure E.1-8: Load current and voltage for a CM – 19 May 2005

(30 minute period).

0 200 400 600 800 15:30 16:30 17:30 18:30 19:30 20:30 21:30 22:30

Time (hh:mm)

Li

ne

V

ol

ta

ge

(V

)

0 100 200 300 400 500 600 700

C

ur

re

nt

(A

)

Current (A) Cable rating (A) 0 200 400 600 800 1000 1200 21:30 21:35 21:40 21:45 21:50 21:55 22:00

Time (hh:mm)

Li

ne

V

ol

ta

ge

(V

)

0 100 200 300 400 500 600 700 800 900 1000

C

ur

re

nt

(A

)

(8)

E.1.2 SECTION 61

E.1.2.1 Morning shifts

Table E-4: Reasons for breakdowns and absent data.

Figure E.1-9: Load current and voltage for a CM – 23 May 2005.

Date

Time start Time stop Reason for breakdown or no data

23-May-2005

SOS

EOS

Current maximum limited to 315 A - data

recorder range settings faulty.

14:40

EOS

Conveyor belt lockout.

24-May-2005

07:35

09:10

GEB - Earth fault.

09:10

10:50

No service water.

25-May-2005

14:45

EOS

Conveyor belt torn - 12 m.

0 200 400 600 800 1000 1200 6:30 7:30 8:30 9:30 10:30 11:30 12:30 13:30 14:30

Time (hh:mm)

Li

ne

V

ol

ta

ge

(V

)

0 100 200 300 400 500 600 700 800 900 1000

C

ur

re

nt

(A

)

(9)

Figure E.1-10: Load current and voltage for a CM – 23 May 2005

(30 minute period).

Figure E.1-11: Load current and voltage for a CM – 24 May 2005.

0 200 400 600 800 12:30 12:35 12:40 12:45 12:50 12:55 13:00

Time (hh:mm)

Li

ne

V

ol

ta

ge

(V

)

0 100 200 300 400 500 600 700

C

ur

re

nt

(A

)

0 200 400 600 800 1000 1200 6:30 7:30 8:30 9:30 10:30 11:30 12:30 13:30 14:30

Time (hh:mm)

Li

ne

V

ol

ta

ge

(V

)

0 100 200 300 400 500 600 700 800 900 1000

C

ur

re

nt

(A

)

(10)

Figure E.1-12: Load current and voltage for a CM – 24 May 2005

(30 minute period).

0 200 400 600 800 1000 1200 12:30 12:35 12:40 12:45 12:50 12:55 13:00

Time (hh:mm)

Li

ne

V

ol

ta

ge

(V

)

0 100 200 300 400 500 600 700 800 900 1000

C

ur

re

nt

(A

)

0 200 400 600 800 1000 1200 6:30 7:30 8:30 9:30 10:30 11:30 12:30 13:30 14:30

Time (hh:mm)

Li

ne

V

ol

ta

ge

(V

)

0 100 200 300 400 500 600 700 800 900 1000

C

ur

re

nt

(A

)

(11)

Figure E.1-14: Load current and voltage for a CM – 25 May 2005

(30 minute period).

E.1.2.2 Afternoon shifts

Table E-5: Reasons for breakdowns and absent data.

Date

Time start Time stop Reason for breakdown or no data

23-May-2005

SOS

EOS

Current maximum limited to 315 A - data

recorder range settings faulty.

SOS

15:50

Conveyor belt lockout.

22:32

22:52

CM - Right hand torque shaft faulty.

23:00

EOS

No voltage data - recorder stopped recording.

23:17

EOS

No current data - recorder stopped recording.

24-May-2005

23:01

EOS

No voltage data - recorder stopped recording.

25-May-2005

19:20

20:45

Conveyor belt torn - 15 m.

21:10

EOS

Conveyor belt torn - 50 m.

23:06

EOS

No voltage data - recorder stopped recording.

0 200 400 600 800 12:00 12:05 12:10 12:15 12:20 12:25 12:30

Time (hh:mm)

Li

ne

V

ol

ta

ge

(V

)

0 100 200 300 400 500 600 700

C

ur

re

nt

(A

)

(12)

Figure E.1-15: Load current and voltage for a CM – 23 May 2005.

Figure E.1-16: Load current and voltage for a CM – 23 May 2005

0 200 400 600 800 1000 1200 15:30 16:30 17:30 18:30 19:30 20:30 21:30 22:30 23:30

Time (hh:mm)

Li

ne

V

ol

ta

ge

(V

)

0 100 200 300 400 500 600 700 800 900 1000

C

ur

re

nt

(A

)

Voltage (V) Voltage limit (upper) Voltage limit (lower) Current (A) Cable rating (A) 0 200 400 600 800 1000 1200 20:30 20:35 20:40 20:45 20:50 20:55 21:00

Time (hh:mm)

Li

ne

V

ol

ta

ge

(V

)

0 100 200 300 400 500 600 700 800 900 1000

C

ur

re

nt

(A

)

(13)

Figure E.1-17: Load current and voltage for a CM – 24 May 2005.

Figure E.1-18: Load current and voltage for a CM – 24 May 2005

(30 minute period).

0 200 400 600 800 15:30 16:30 17:30 18:30 19:30 20:30 21:30 22:30 23:30

Time (hh:mm)

Li

ne

V

ol

ta

ge

(V

)

0 100 200 300 400 500 600 700

C

ur

re

nt

(A

)

Current (A) Cable rating (A) 0 200 400 600 800 1000 1200 21:30 21:35 21:40 21:45 21:50 21:55 22:00

Time (hh:mm)

Li

ne

V

ol

ta

ge

(V

)

0 100 200 300 400 500 600 700 800 900 1000

C

ur

re

nt

(A

)

(14)

Figure E.1-19: Load current and voltage for a CM – 25 May 2005.

Figure E.1-20: Load current and voltage for a CM – 25 May 2005

0 200 400 600 800 1000 1200 15:30 16:30 17:30 18:30 19:30 20:30 21:30 22:30 23:30

Time (hh:mm)

Li

ne

V

ol

ta

ge

(V

)

0 100 200 300 400 500 600 700 800 900 1000

C

ur

re

nt

(A

)

Voltage (V) Voltage limit (upper) Voltage limit (lower) Current (A) Full load (A)

0 200 400 600 800 1000 1200 18:30 18:35 18:40 18:45 18:50 18:55 19:00

Time (hh:mm)

Li

ne

V

ol

ta

ge

(V

)

0 100 200 300 400 500 600 700 800 900 1000

C

ur

re

nt

(A

)

(15)

The tables give data about the tonnes produced during the shift and the percentage

time of the shift that the motors were producing. The time that the cables have been

over loaded or loaded within the rated capacity of the cables are given as a

percentage of the actual producing time. The morning shifts and afternoon shifts are

separated as well as the measurements made at the different sections.

(16)

E.2.1 SECTION 21

E.2.1.1 Morning shifts

Table E-6: Data for the total consumption of a CM in section 21.

Figure E.2-1: Histogram for current consumed by a CM.

0 1000 2000 3000 4000 5000 6000 7000 0 _{30 60 90 120 150 180 210 240 270 300 330 360 390 420 450 480 510 540 570 600}

Current bins (A)

Fr

eq

ue

nc

y

17-May-05 18-May-05 19-May-05

Tonnes/CM/Shift

858 1320

1716

% Time of shift producing

0.00%

63.74%

% of Production time underloaded

-

72.01%

% of Production time overloaded

-

27.99%

(17)

Figure E.2-2: Histogram for current consumed by a CM.

0 1000 2000 3000 4000 5000 6000 7000 0 _{30 60 90 120 150 180 210 240 270 300 330 360 390 420 450 480 510 540 570 600}

Current bins (A)

Fr

eq

ue

nc

y

17-May-05 18-May-05 19-May-05

Tonnes/CM/Shift

2145

2112

2013

% Time of shift producing

0.00%

84.80%

% of Production time underloaded

-

69.07%

(18)

E.2.2 SECTION 61

E.2.2.1 Morning shifts

Table E-8: Data for the total consumption of a CM in section 61.

Figure E.2-3: Histogram for current consumed by a CM.

0 1000 2000 3000 4000 5000 6000 7000 0 _{30 60 90 120 150 180 210 240 270 300 330 360 390 420 450 480 510 540 570 600}

Current bins (A)

Fr

eq

ue

nc

y

23-May-05 24-May-05 25-May-05

Tonnes/CM/Shift

1740

1450

2320

% Time of shift producing

85.27%

57.65%

84.28%

% of Production time underloaded

100.00%

72.87%

65.87%

% of Production time overloaded

0.00%

27.13%

34.13%

(19)

Figure E.2-4: Histogram for current consumed by a CM.

0 1000 2000 3000 4000 5000 6000 7000 0 _{30 60 90 120 150 180 210 240 270 300 330 360 390 420 450 480 510 540 570 600}