TABLE OF CONTENTS Appendix G

(1)

Appendix G

Feeder Breaker trailing cables...1

G.1 Load profile...1

G.1.1 Section 21 ...2

G.1.1.1 Morning shifts ...2

G.1.1.2 Afternoon shifts ...5

G.1.2 Section 61 ...9

G.1.2.1 Morning shifts ...9

G.1.2.2 Afternoon shifts ...12

G.2 Histogram ...16

G.2.1 Section 21 ...17

G.2.1.1 Morning shifts ...17

G.2.1.2 Afternoon shifts ...18

G.2.2 Section 61 ...19

G.2.2.1 Morning shifts ...19

G.2.2.2 Afternoon shifts ...20

(2)

APPENDIX G

FEEDER BREAKER TRAILING CABLES

The total consumption of a Feeder Breaker was measured at the Gate end boxes of

each section, which supplies the Feeder Breaker with power. The present sustained

capacity of the Feeder Breaker trailing cable could thus be determined.

Measurements were made on the supply to the Feeder Breaker for a number of shifts

as can be seen in Table G-1.

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

Feeder Breakers are supplied with power from Gate end boxes with a 16 mm

2

_trailing

cable that is generally 200 meters long. The cable is rated for a current of 105 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 115 A for the cable.

G.1 LOAD PROFILE

The next section focuses on the load profiles of the Feeder Breakers. 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)

G.1.1 SECTION 21

G.1.1.1 Morning shifts

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

Figure G.1-1: Load current and voltage for a FB – 17 May 2005.

Date

Time start Time stop Reason for breakdown or no data

17-May-2005

SOS

09:30

Section belt electrical fault.

12:35

14:05

CM trailing cable faulty.

18-May-2005

SOS

08:50

CM trailing cable faulty.

19-May-2005

07:20

08:30

CM trailing cable faulty.

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 50 100 150 200 250 300

C

ur

re

nt

(A

)

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

(4)

Figure G.1-2: Load current and voltage for a FB – 17 May 2005

(30 minute period).

Figure G.1-3: Load current and voltage for a FB – 18 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 50 100 150 200 250 300

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 11:30 11:35 11:40 11:45 11:50 11:55 12:00

Time (hh:mm)

Li

ne

V

ol

ta

ge

(V

)

0 50 100 150 200 250 300

C

ur

re

nt

(A

)

(5)

Figure G.1-4: Load current and voltage for a FB – 18 May 2005

(30 minute period).

Figure G.1-5: Load current and voltage for a FB – 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 50 100 150 200 250 300

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 9:30 9:35 9:40 9:45 9:50 9:55 10:00

Time (hh:mm)

Li

ne

V

ol

ta

ge

(V

)

0 50 100 150 200 250 300

C

ur

re

nt

(A

)

(6)

Figure G.1-6: Load current and voltage for a FB – 19 May 2005

(30 minute period).

G.1.1.2 Afternoon shifts

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

Date

Time start Time stop Reason for breakdown or no data

17-May-2005

23:14

EOS

No voltage data - recorder stopped recording.

23:27

EOS

No current data - recorder stopped recording.

18-May-2005

23:34

EOS

No voltage data - recorder stopped recording.

23:37

EOS

No current data - recorder stopped recording.

19-May-2005

22:30

EOS

No current data - recorder stopped recording.

22:44

EOS

No voltage data - recorder stopped recording.

0 200 400 600 800 1000 1200 13:00 13:05 13:10 13:15 13:20 13:25 13:30

Time (hh:mm)

Li

ne

V

ol

ta

ge

(V

)

0 50 100 150 200 250 300

C

ur

re

nt

(A

)

(7)

Figure G.1-7: Load current and voltage for a FB – 17 May 2005.

Figure G.1-8: Load current and voltage for a FB – 17 May 2005

(30 minute period).

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 50 100 150 200 250 300

C

ur

re

nt

(A

)

0 200 400 600 800 1000 1200 20:00 20:05 20:10 20:15 20:20 20:25 20:30

Time (hh:mm)

Li

ne

V

ol

ta

ge

(V

)

0 50 100 150 200 250 300

C

ur

re

nt

(A

)

(8)

Figure G.1-9: Load current and voltage for a FB – 18 May 2005.

Figure G.1-10: Load current and voltage for a FB – 18 May 2005

(30 minute period).

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 50 100 150 200 250 300

C

ur

re

nt

(A

)

0 200 400 600 800 1000 1200 19:30 19:35 19:40 19:45 19:50 19:55 20:00

Time (hh:mm)

Li

ne

V

ol

ta

ge

(V

)

0 50 100 150 200 250 300

C

ur

re

nt

(A

)

(9)

Figure G.1-11: Load current and voltage for a FB – 19 May 2005.

Figure G.1-12: Load current and voltage for a FB – 19 May 2005

(30 minute period).

0 200 400 600 800 1000 1200 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 50 100 150 200 250 300

C

ur

re

nt

(A

)

0 200 400 600 800 1000 1200 19:30 19:35 19:40 19:45 19:50 19:55 20:00

Time (hh:mm)

Li

ne

V

ol

ta

ge

(V

)

0 50 100 150 200 250 300

C

ur

re

nt

(A

)

(10)

G.1.2 SECTION 61

G.1.2.1 Morning shifts

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

Figure G.1-13: Load current and voltage for a FB – 23 May 2005.

Date

Time start Time stop Reason for breakdown or no data

23-May-2005

14:40

EOS

Conveyor belt lockout.

24-May-2005

SOS

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 50 100 150 200 250 300

C

ur

re

nt

(A

)

(11)

Figure G.1-14: Load current and voltage for a FB – 23 May 2005

(30 minute period).

Figure G.1-15: Load current and voltage for a FB – 24 May 2005.

0 200 400 600 800 1000 1200 11:30 11:35 11:40 11:45 11:50 11:55 12:00

Time (hh:mm)

Li

ne

V

ol

ta

ge

(V

)

0 50 100 150 200 250 300

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 50 100 150 200 250 300

C

ur

re

nt

(A

)

(12)

Figure G.1-16: Load current and voltage for a FB – 24 May 2005

(30 minute period).

Figure G.1-17: Load current and voltage for a FB – 25 May 2005.

0 200 400 600 800 1000 1200 11:30 11:35 11:40 11:45 11:50 11:55 12:00

Time (hh:mm)

Li

ne

V

ol

ta

ge

(V

)

0 50 100 150 200 250 300

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 50 100 150 200 250 300

C

ur

re

nt

(A

)

(13)

Figure G.1-18: Load current and voltage for a FB – 25 May 2005

(30 minute period).

G.1.2.2 Afternoon shifts

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

Date

Time start Time stop Reason for breakdown or no data

23-May-2005

21:29

EOS

No current data - recorder stopped recording.

23:04

EOS

No voltage data - recorder stopped recording.

24-May-2005

19:13

19:19

Conveyor belt - E stop activated.

19:25

19:37

Conveyor belt - E stop activated.

22:45

EOS

No current data - recorder stopped recording.

23:30

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.

22:59

EOS

No voltage data - recorder stopped recording.

23:41

EOS

No current data - recorder stopped recording.

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 50 100 150 200 250 300

C

ur

re

nt

(A

)

(14)

Figure G.1-19: Load current and voltage for a FB – 23 May 2005.

Figure G.1-20: Load current and voltage for a FB – 23 May 2005

(30 minute period).

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 50 100 150 200 250 300

C

ur

re

nt

(A

)

0 200 400 600 800 1000 1200 19:30 19:35 19:40 19:45 19:50 19:55 20:00

Time (hh:mm)

Li

ne

V

ol

ta

ge

(V

)

0 50 100 150 200 250 300

C

ur

re

nt

(A

)

(15)

Figure G.1-21: Load current and voltage for a FB – 24 May 2005

Figure G.1-22: Load current and voltage for a FB – 24 May 2005

(30 minute period).

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 50 100 150 200 250 300

C

ur

re

nt

(A

)

0 200 400 600 800 1000 1200 20:00 20:05 20:10 20:15 20:20 20:25 20:30

Time (hh:mm)

Li

ne

V

ol

ta

ge

(V

)

0 50 100 150 200 250 300

C

ur

re

nt

(A

)

(16)

Figure G.1-23: Load current and voltage for a FB – 25 May 2005.

Figure G.1-24: Load current and voltage for a FB – 25 May 2005

(30 minute period).

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 50 100 150 200 250 300

C

ur

re

nt

(A

)

0 200 400 600 800 1000 1200 17:00 17:05 17:10 17:15 17:20 17:25 17:30

Time (hh:mm)

Li

ne

V

ol

ta

ge

(V

)

0 50 100 150 200 250 300

C

ur

re

nt

(A

)

(17)

G.2 HISTOGRAM

The next section focuses on the frequency with which a Feeder Breaker consumed a

certain load current. The graphs show the number of times a certain current has been

consumed. 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.

(18)

G.2.1 SECTION 21

G.2.1.1 Morning shifts

Table G-6: Data for the total consumption of a FB in section 21.

Figure G.2-1: Histogram for current consumed by a FB.

0 2000 4000 6000 8000 10000 12000 14000 16000 18000 0 5 ₁₀ ₁₅ ₂₀ ₂₅ ₃₀ ₃₅ ₄₀ ₄₅ ₅₀ ₅₅ ₆₀

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

33.49%

63.80%

70.71%

% of Production time underloaded

99.76%

99.96%

99.98%

(19)

G.2.1.2 Afternoon shifts

Table G-7: Data for the total consumption of a FB in section 21.

Figure G.2-2: Histogram for current consumed by a FB.

0 2000 4000 6000 8000 10000 12000 14000 16000 18000 0 5 ₁₀ ₁₅ ₂₀ ₂₅ ₃₀ ₃₅ ₄₀ ₄₅ ₅₀ ₅₅ ₆₀

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

92.61%

86.05%

90.48%

% of Production time underloaded

99.92%

99.96%

99.99%

(20)

G.2.2 SECTION 61

G.2.2.1 Morning shifts

Table G-8: Data for the total consumption of a FB in section 61.

Figure G.2-3: Histogram for current consumed by a FB.

0 2000 4000 6000 8000 10000 12000 14000 16000 18000 0 5 ₁₀ ₁₅ ₂₀ ₂₅ ₃₀ ₃₅ ₄₀ ₄₅ ₅₀ ₅₅ ₆₀

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

76.04%

58.91%

82.66%

% of Production time underloaded

99.90%

99.95%

99.90%

(21)

G.2.2.2 Afternoon shifts

Table G-9: Data for the total consumption of a FB in section 61.

Figure G.2-4: Histogram for current consumed by a FB.

0 2000 4000 6000 8000 10000 12000 14000 16000 18000 0 5 ₁₀ ₁₅ ₂₀ ₂₅ ₃₀ ₃₅ ₄₀ ₄₅ ₅₀ ₅₅ ₆₀