BHUTAN POWER CORPORATION LIMITED
NATIONAL LOAD DISPATCH CENTRE
THIMPHU : BHUTAN
TRANSMISSION SYSTEM PERFORMANCE REPORT
FOR THE MONTH OF JANUARY TO MARCH, 2015
06-May-2015
Sl. No
Table of Contents
Page No.
1.0
INTRODUCTION ........................................................................................................................................ 2
2.0
PERFORMANCE OF GENERATING STATIONS .................................................................................... 2
2.1
2.2
POWER AND ENERGY GENERATION ........................................................................................................ 2
CAPACITY FACTOR ...................................................................................................................................... 3
3.0
PEAK DEMAND, ENERGY AVAILABILITY AND REQUIREMENT FOR THE COUNTRY .............. 4
4.0
EXPORT AND IMPORT OF ELECTRICITY (POWER AND ENERGY) TO/FROM INDIA ................ 6
5.0
FREQUENCY PROFILE: MAXIMUM AND MINIMUM FREQUENCY RECORDED AND THE
FREQUENCY DURATION IN DIFFERENT FREQUENCY BANDS ................................................................... 8
5.1
5.2
5.3
5.4
6.0
6.1
6.2
6.3
6.4
7.0
7.1
7.2
7.3
8.0
FREQUENCY PROFILE IN THE MONTH OF JANUARY, 2015 .................................................................. 8
FREQUENCY PROFILE IN THE MONTH OF FEBRUARY, 2015 ............................................................. 10
FREQUENCY PROFILE IN THE MONTH OF MARCH, 2015 .................................................................... 11
FREQUENCY PROFILE SUMMARY .......................................................................................................... 12
VOLTAGE PROFILE OF SELECTED SUBSTATIONS ......................................................................... 13
VOLTAGE PROFILE IN THE MONTH OF JANUARY, 2015 ..................................................................... 13
VOLTAGE PROFILE IN THE MONTH OF FEBRUARY, 2015 .................................................................. 15
VOLTAGE PROFILE IN THE MONTH OF MARCH, 2015 ......................................................................... 16
VOLTAGE PROFILE SUMMARY................................................................................................................ 17
MAJOR GENERATION AND TRANSMISSION OUTAGE ................................................................... 18
GENERATION OUTAGE .............................................................................................................................. 18
EASTERN GRID TRANSMISSION OUTAGE ............................................................................................. 18
WESTERN GRID TRANSMISSION OUTAGE ............................................................................................ 18
TRANSMISSION CONSTRAINTS ........................................................................................................... 18
9.0
INSTANCES OF PERSISTENT OR SIGNIFICANT NON-COMPLIANCE WITH THE GRID CODE
REGULATION ....................................................................................................................................................... 18
Page 1 of 44
1.0
INTRODUCTION
In compliance to the Grid Code Regulation (GCR) 2008, clause 6.14.1 which states that System
Operator has to submit a quarterly report covering the performance of the Transmission System to all
licensees, Authority and Ministry. This report contains the performance of Bhutan Grid for the
month of January to March, 2015.
2.0
PERFORMANCE OF GENERATING STATIONS
2.1
POWER AND ENERGY GENERATION
As per the hourly data received from various hydropower plants, the maximum individual plant
generation was 404.00MW by Tala Hydropower Plant in the month of March and minimum
generation was 5.11MW by Basochhu Hydropower Plant in the month of February.
Table: 2.1.1
Generation
By
Month
Jan
Feb
Mar
Graph: 2.1.1
Summary of maximum and minimum generation by various hydropower plants.
BHP (MW)
Max
26.96
23.69
26.81
CHP (MW)
Min
11.39
5.11
5.44
Max
116.88
106.00
150.00
THP (MW)
Min
72.46
7.00
46.00
Max
350.00
320.00
404.00
KHP (MW)
Min
140.00
120.00
140.00
Max
32.89
32.88
49.35
Min
10.48
10.54
10.22
Summary of maximum and minimum generation by various hydropower plants
450.00
Generation Summary
400.00
Generation (MW)
350.00
300.00
250.00
Jan
200.00
Feb
150.00
Mar
100.00
50.00
0.00
Max
Min
BHP (MW)
Max
Min
CHP (MW)
Max
Min
THP (MW)
Max
Min
KHP (MW)
Daily maximum, minimum and average generation by each generating plant for the month of
January to March, 2015 is attached as Annexure- I.
Page 2 of 44
2.2
CAPACITY FACTOR
The capacity factor of each generating plant was calculated as below:
Capacity Factor
= (Actual output of a plant over a period of time) / (Output when operated
at name plate rated capacity for entire time)
= (Total energy plant has produce over a period) / (Total energy plant
would produce when operated at full rated capacity)
Table: 2.2.1
Total generation and capacity factor of various hydropower plants
BHP
(MU)
13.40467
10.27941
10.62672
Month
Jan
Feb
Mar
Graph: 2.2.1
BHP
(CF)
28.15%
23.90%
22.32%
CHP
(MU)
66.31000
45.96400
59.13500
CHP
(CF)
26.53%
20.36%
23.66%
THP (MU)
141.806878
107.82340
130.85416
THP
(CF)
16.02%
13.48%
14.78%
KHP
(MU)
13.803162
10.930202
14.181378
Capacity factor of various hydropower plants
Plant Capacity Factor
35.00%
30.00%
Capacity Factor
25.00%
20.00%
Jan
Feb
15.00%
Mar
10.00%
5.00%
0.00%
BHP (CF)
CHP (CF)
THP (CF)
Page 3 of 44
KHP (CF)
KHP
(CF)
30.92%
27.11%
31.77%
3.0
PEAK DEMAND, ENERGY AVAILABILITY AND REQUIREMENT FOR THE COUNTRY
Calculation of peak demand for the Eastern Grid, Western Grid and National demand, we use the
following methods:
1. National Demand = (Sum of all total generation) – (Sum of all Export or Import)
2. National Demand = (Sum of all feeders loading at hydropower station) – (Sum of all
Export or Import)
3. National Demand = (Sum of all substation loading)
For our record, we calculate the National Demand using method- 2 and method- 3. However total
demand calculated using method- 3 will be exclusive of transmission losses.
Table: 3.0.1
Domestic demand for Eastern Grid, Western Grid and National using method- 2
Eastern Grid Load
(MW)
Max
Min
61.40
13.69
54.93
12.33
57.01
6.01
Grid
Month
Jan
Feb
Mar
Graph: 3.0.1
Western Grid Load
(MW)
Max
Min
283.21
93.65
284.19
131.60
251.25
115.50
National Load (MW)
Max
330.88
323.27
291.11
Min
143.96
155.12
146.60
Domestic demand for Eastern Grid, Western Grid and National using method- 2
350.00
Load Summary
300.00
Load (MW)
250.00
200.00
Jan
150.00
Feb
Mar
100.00
50.00
0.00
Max
Min
Eastern Grid Load (MW)
Max
Min
Western Grid Load (MW)
Page 4 of 44
Max
Min
National Load (MW)
Table: 3.0.2
Domestic demand for Eastern Grid, Western Grid and National using method- 3
Eastern Grid Load
(MW)
Max
Min
59.67
9.87
57.21
12.56
63.83
16.06
Grid
Month
Jan
Feb
Mar
Graph: 3.0.2
Western Grid Load
(MW)
Max
Min
273.77
147.22
234.89
136.62
247.17
127.15
National Load (MW)
Max
324.23
280.31
296.70
Min
180.62
159.42
166.43
Domestic demand for Eastern Grid, Western Grid and National using method- 3
350.00
Load Summary
300.00
Load (MW)
250.00
200.00
Jan
150.00
Feb
Mar
100.00
50.00
0.00
Max
Min
Eastern Grid Load (MW)
Max
Min
Western Grid Load (MW)
Max
Min
National Load (MW)
The domestic load pattern for the month of January to March calculated using method- 3 is attached
as Annexure-II.
The total energy consumed within Bhutan is computed by the total energy DGPC had sold to BPC including
the royal energy.
Table: 3.0.3
Month
Jan
Feb
Mar
Domestic Energy consumption for Eastern Grid, Western Grid and National.
Eastern Grid
Consumption
KHP (MU)
27.588798
23.479837
27.076765
Western Grid Consumption
THP (MU)
122.528771
93.687731
107.803359
Page 5 of 44
CHP (MU)
47.3509445
35.91172164
38.5645025
Total Consumption
(MU)
197.4685135
153.0792896
173.4446265
Graph: 3.0.3
Domestic Energy consumption for Eastern Grid, Western Grid and National.
250
Energy Consumptions
Energy (MU)
200
150
Jan
100
Feb
Mar
50
0
KHP (MU)
THP (MU)
Eastern Grid
Consumption
4.0
CHP (MU)
Western Grid Consumption
(MU)
Total Consumption
EXPORT AND IMPORT OF ELECTRICITY (POWER AND ENERGY) TO/FROM INDIA
Maximum export of power was 283.00MW to Binaguri substation, India during the month of March
and minimum export was 0.00MW to Salakoti and Rangia substation. Maximum import of power
was recorded as 110.00MW from Birpara substation during month of March. during that particular
hour, 220kV Chukha – Malbase was under shutdown.
Table: 4.0.1
Export of power to India
Export To
Binaguri (MW)
Birpara (MW)
Month
Jan
Feb
Mar
Max
226.00
177.00
283.00
Max
35.95
59.00
104.00
Min
2.00
1.00
1.00
Min
0.01
0.14
1.00
Page 6 of 44
Salakoti and Rangia
(MW)
Max
Min
0.00
0.00
5.65
0.29
36.54
0.05
Graph: 4.0.1
Export of power to India
Export to India
300.00
Export (MW)
250.00
200.00
150.00
Jan
Feb
100.00
Mar
50.00
0.00
Max
Min
Max
Binaguri (MW)
Table: 4.0.2
Import
From
Month
Jan
Feb
Mar
Graph: 4.0.2
Min
Birpara (MW)
Max
Min
Salakoti and Rangia (MW)
Import of power from India
Binaguri (MW)
Birpara (MW)
Max
17.00
41.00
19.00
Max
39.95
50.00
110.00
Min
1.00
1.00
1.00
Min
0.05
1.00
1.00
Salakoti and Rangia
(MW)
Max
Min
41.40
0.06
44.82
0.25
36.44
0.32
Import of power from India
Import from India
120.00
Import (MW)
100.00
80.00
60.00
Ja n
Feb
40.00
Ma r
20.00
0.00
Max
Min
Binaguri (MW)
Max
Min
Birpara (MW)
Page 7 of 44
Max
Min
Salakoti and Rangia (MW)
Daily maximum, minimum and average Export/Import of power to/from India for the month of
January to March, 2015 is attached as Annexure- III.
The net export to India by various plants is computed as energy figure used in wheeling of BPC for
each plant.
Table: 4.0.3
Net Export of Energy (MU) from various generating plants
Export/Import
Month
Jan
Feb
Mar
Graph: 4.0.3
CHP (MU)
Export
Import
30.623604
0.447
16.60175736
1.848
31.03913565
0.373
THP (MU)
Export
Import
17.10060858 12.062126
11.6229238
5.676658
20.06250355
6.653264
KHP (MU)
Export
Import
0.006034
18.25
0.032324
15.302
0
15.865
Net Export of Energy (MU) from various generating plants
Export/Import to India
35
30
Energy (MU)
25
20
Jan
15
Feb
10
Mar
5
0
Export
Import
CHP (MU)
Export
Import
THP (MU)
Export
Import
KHP (MU)
5.0
FREQUENCY PROFILE: MAXIMUM AND MINIMUM FREQUENCY RECORDED AND
THE FREQUENCY DURATION IN DIFFERENT FREQUENCY BANDS
5.1
FREQUENCY PROFILE IN THE MONTH OF JANUARY, 2015
As per the Grid Code 2008, clause 6.4.1 the frequency was classified into three different bands as
follows:
1. Normal State
The Transmission System frequency is within the limit of 49.5Hz to 50.5Hz
2. Alert State
The Transmission System frequency is beyond the normal operating limit but within 49.0Hz to
51.0Hz
3. Emergency State
Page 8 of 44
There is generation deficiency and frequency is below 49.0Hz
We had based our frequency at 220kV Bus frequency at 220/66/11kV Semtokha substation in the
western grid and 132kV Bus frequency at 60MW Kurichhu Hydropower Plant in the eastern grid.
Table: 5.1.1
Sl. No.
1
2
3
4
Graph: 5.1.1
Frequency profile at Semtokha substation
Operating State
Normal State
Alert State
Emergency State
Blackout/Other
220kV Bus Voltage
100.00%
0.00%
0.00%
0.00%
Frequency profile at Semtokha substation
220kV Bus Frequency at Semtokha Substation
0.00%
0.00%
0.00%
Normal State
Alert State
Emergency State
100.00%
Table: 5.1.2
Sl. No.
1
2
3
4
Blackout/Other
Frequency profile at Kurichhu Hydropower Plant
Operating State
Normal State
Alert State
Emergency State
Blackout/Other
132kV Bus Voltage
100.00%
0.00%
0.00%
0.00%
Page 9 of 44
Graph: 5.1.2
Frequency profile at Kurichhu Hydropower Plant
132kV Bus Frequency at Kurichhu
Hydropower Plant
0.00%
Normal State
0.00%
Alert State
0.00%
Emergency State
100.00%
Blackout/Other
5.2
FREQUENCY PROFILE IN THE MONTH OF FEBRUARY, 2015
Table: 5.2.1
Sl. No.
1
2
3
4
Graph: 5.2.1
Frequency profile at Semtokha substation
Operating State
Normal State
Alert State
Emergency State
Blackout/Other
220kV Bus Voltage
100.00%
0.00%
0.00%
0.00%
Frequency profile at Semtokha substation
220kV Bus Frequency at Semtokha Substation
0.00%
0.00%
0.00%
Normal State
Alert State
Emergency State
100.00%
Blackout/Other
Page 10 of 44
Table: 5.2.2
Sl. No.
1
2
3
4
Graph: 5.2.2
Frequency profile at Kurichhu Hydropower Plant
Operating State
Normal State
Alert State
Emergency State
Blackout/Other
132kV Bus Voltage
98.81%
0.00%
0.00%
1.19%
Frequency profile at Kurichhu Hydropower Plant
132kV Bus Frequency at Kurichhu
Hydropower Plant
0.00%
0.00%
1.19%
Normal State
Alert State
Emergency State
98.81%
5.3
Blackout/Other
FREQUENCY PROFILE IN THE MONTH OF MARCH, 2015
Table: 5.3.1
Sl. No.
1
2
3
4
Graph: 5.3.1
Frequency profile at Semtokha substation
Operating State
Normal State
Alert State
Emergency State
Blackout/Other
220kV Bus Voltage
99.87%
0.13%
0.00%
0.00%
Frequency profile at Semtokha substation
220kV Bus Frequency at Semtokha Substation
0.00%
0.13%
0.00%
Normal State
Alert State
Emergency State
99.87%
Blackout/Other
Page 11 of 44
Table: 5.3.2
Sl. No.
1
2
3
4
Graph: 5.3.2
Frequency profile at Kurichhu Hydropower Plant
Operating State
Normal State
Alert State
Emergency State
Blackout/Other
132kV Bus Voltage
100.00%
0.00%
0.00%
0.00%
Frequency profile at Kurichhu Hydropower Plant
132kV Bus Frequency at Kurichhu
Hydropower Plant
0.00%
0.00%
0.00%
Normal State
Alert State
Emergency State
100.00%
5.4
Blackout/Other
FREQUENCY PROFILE SUMMARY
Table: 5.4.1
Frequency profile summary
Substation/Plant
Month
Jan
Feb
Mar
Bus Frequency at Semtokha
Substation (Hz)
Max
Bus Frequency at Kurichhu
Hydropower Plant (Hz)
Min
50.30
50.20
50.50
Max
49.60
49.70
49.30
Page 12 of 44
Min
50.35
50.50
50.41
49.50
49.51
49.55
Graph: 5.4.2
Frequency profile summary
Frequency Profile
50.60
50.40
Frequency (Hz)
50.20
50.00
49.80
49.60
49.40
Ja n
49.20
Feb
Ma r
49.00
48.80
48.60
Max
Min
Max
Bus Frequency at Semtokha Substation
(Hz)
Min
Bus Frequency at Kurichhu Hydropower
Plant (Hz)
Daily maximum, minimum and average frequency of Semtokha substation in western grid and
Kurichhu Hydropower Plant in eastern grid for the month of January to March, 2015 is attached as
Annexure- IV.
6.0
VOLTAGE PROFILE OF SELECTED SUBSTATIONS
6.1
VOLTAGE PROFILE IN THE MONTH OF JANUARY, 2015
As per the Grid Code 2008, clause 6.4.1 the voltage at all connection point was classified into three
different bands as follows:
1. Normal State
The voltage at all connection points are within the limits of 0.95 times and 1.05 times of the
normal values
2. Alert State
The voltage at all connection points are outside the normal limit but within the limits of 0.9
times and 1.1 times of the nominal values.
3. Emergency State
Transmission system voltages are outside the limit of 0.9 times and 1.1 times of nominal values.
Due to center location of 400/22/66/11kV Malbase substation in western grid and 132/33/11kV
Nangkhor substation in the eastern grid, we took the voltage profile of the above mention
substations.
Table: 6.1.1
Sl. No.
1
2
3
4
Voltage profile at Malbase substation
Operating State
Normal State
Alert State
Emergency State
Blackout/Other
400kV Bus Voltage
99.73%
0.27%
0.00%
0.00%
Page 13 of 44
220kV Bus Voltage
99.06%
0.94%
0.00%
0.00%
66kV Bus Voltage
99.87%
0.13%
0.00%
0.00%
Graph: 6.1.1
Voltage profile at Malbase substation
400kV Bus Voltage at Malbase Substation
0.27%
0.00%
0.00%
Normal State
Alert State
Emergency State
Blackout/Other
99.73%
Table: 6.1.2
Sl. No.
1
2
3
4
Graph: 6.1.2
Voltage profile at Nangkhor substation
Operating State
Normal State
Alert State
Emergency State
Blackout/Other
132kV Bus Voltage
97.58%
1.61%
0.00%
0.81%
Voltage profile at Nangkhor substation
132kV Bus Voltage at Nangkhor Substation
0.00%
1.61%
0.81%
Normal State
Alert State
Emergency State
Blackout/Other
97.58%
Page 14 of 44
6.2
VOLTAGE PROFILE IN THE MONTH OF FEBRUARY, 2015
Table: 6.2.1
Sl. No.
1
2
3
4
Graph: 6.2.1
Voltage profile at Malbase substation
Operating State
Normal State
Alert State
Emergency State
Blackout/Other
400kV Bus Voltage
100.00%
0.00%
0.00%
0.00%
Voltage profile at Malbase substation
400kV Bus Voltage at Malbase Substation
0.00%
0.00%
0.00%
Normal State
Alert State
Emergency State
Blackout/Other
100.00%
Table: 6.2.2
Sl. No.
1
2
3
4
Graph: 6.2.2
Voltage profile at Nangkhor substation
Operating State
Normal State
Alert State
Emergency State
Blackout/Other
132kV Bus Voltage
97.47%
2.53%
0.00%
0.00%
Voltage profile at Nangkhor substation
132kV Bus Voltage at Nangkhor Substation
0.00%
2.53%
0.00%
Normal State
Alert State
Emergency State
Blackout/Other
97.47%
Page 15 of 44
220kV Bus Voltage
99.26%
0.74%
0.00%
0.00%
66kV Bus Voltage
99.85%
0.15%
0.00%
0.00%
6.3
VOLTAGE PROFILE IN THE MONTH OF MARCH, 2015
Table: 6.3.2
Sl. No.
1
2
3
4
Graph: 6.3.2
Voltage profile at Malbase substation
Operating State
Normal State
Alert State
Emergency State
Blackout/Other
400kV Bus Voltage
100.00%
0.00%
0.00%
0.00%
Voltage profile at Malbase substation
400kV Bus Voltage at Malbase Substation
0.00%
0.00%
0.00%
Normal State
Alert State
Emergency State
Blackout/Other
100.00%
Table: 6.3.2
Sl. No.
1
2
3
4
Graph: 6.3.2
Voltage profile at Nangkhor substation
Operating State
Normal State
Alert State
Emergency State
Blackout/Other
132kV Bus Voltage
98.25%
1.75%
0.00%
0.00%
Voltage profile at Nangkhor substation
132kV Bus Voltage at Nangkhor Substation
0.00%
1.75%
0.00%
Normal State
Alert State
Emergency State
Blackout/Other
98.25%
Page 16 of 44
220kV Bus Voltage
99.60%
0.40%
0.00%
0.00%
66kV Bus Voltage
97.58%
2.28%
0.13%
0.00%
6.4
VOLTAGE PROFILE SUMMARY
Table: 6.4.1
Voltage profile summary
Substation
Voltage
Level
Month
Jan
Feb
Mar
400kV Bus Voltage
(kV)
Max
Min
420.50
397.50
417.00
390.50
417.50
398.50
Graph: 6.4.1
Voltage profile summary
Malbase Substation
220kV Bus Voltage
(kV)
Max
Min
232.00
217.00
232.00
216.00
232.00
214.50
66kV Bus Voltage
(kV)
Max
Min
67.00
62.00
68.00
62.00
67.00
56.50
Nangkhor Substation
132kV Bus Voltage
(kV)
Max
Min
140.20
126.80
141.60
124.40
141.00
125.50
Voltage Profile
450.00
400.00
Voltage (kV)
350.00
300.00
250.00
200.00
150.00
Jan
100.00
Feb
50.00
Mar
0.00
Max
Min
Max
Min
400kV Bus Voltage 220kV Bus Voltage
(kV)
(kV)
Max
Min
66kV Bus Voltage
(kV)
Malbase Substation
Max
Min
132kV Bus Voltage
(kV)
Nangkhor
Substation
Daily maximum, minimum and average bus voltage of Malbase substation in western grid and
Nangkhor substation in eastern grid for the month of January to March, 2015 is attached as
Annexure- V.
Page 17 of 44
7.0
MAJOR GENERATION AND TRANSMISSION OUTAGE
7.1
GENERATION OUTAGE
Generation outage for the first quarter of the year for both eastern and western grid was nil.
7.2
EASTERN GRID TRANSMISSION OUTAGE
Longest eastern transmission outages are 132kV Nangkor-Nanglam line for 8:40 hours on 26th
January, 2015 which the line took shutdown for stringing of new conductor. And 132kV NanglamDCCL line for 12:22 hours on 29th January, 2015.
Detail outages in Eastern Grid for the first quarter of year 2015 are attached as Annexure- VI.
In the attached Annexure, the plant shutdown of transmission line which do not cause interruption to
customer, outage of below 66kV transmission line and cascading tripping due to one main line or
transformer are not reflected.
7.3
WESTERN GRID TRANSMISSION OUTAGE
Longest western transmission outage is 220kV Malbase-Singhigaon feeder-I for 78:23 hours on 14th
January, 2015 which line took shutdown for annual energy meter testing.
Detail outages in Western Grid for the first quarter of year 2015 are attached as Annexure- VII.
In the attached Annexure, the plant shutdown of transmission line which do not cause interruption to
customer, outage of below 66kV transmission line and cascading tripping due to one main line or
transformer are not reflected.
8.0
TRANSMISSION CONSTRAINTS
Major transmission constraints causing generation loss for the first quarter of the year 2015 in the
both western grid and eastern grid was recorded as nil.
9.0
INSTANCES OF PERSISTENT OR SIGNIFICANT NON-COMPLIANCE WITH THE
GRID CODE REGULATION
Instances of non-compliance with Grid Code for the month of January to March, 2015 were recorded
as nil.
Page 18 of 44
Annexure- I
Jan-15
Date
Max
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
20.09
20.07
22.00
22.57
26.96
20.34
20.50
20.02
19.45
19.11
18.82
18.69
18.44
18.21
18.21
18.07
18.53
20.53
17.59
17.70
17.43
17.28
17.36
17.40
17.28
17.24
18.96
17.17
16.83
16.66
16.55
26.96
BHP (MW)
Min
Ava
16.37
19.39
19.77
20.66
19.91
19.73
19.41
18.76
18.33
17.51
17.70
17.62
17.38
17.07
17.10
16.68
15.65
16.54
16.75
16.73
16.71
16.43
16.59
16.72
16.75
16.68
11.39
14.42
16.13
15.75
15.50
Max
19.75
19.88
20.66
21.46
20.60
19.97
19.92
19.48
18.98
18.49
18.42
18.26
18.05
17.87
17.72
17.49
17.47
17.45
17.33
17.34
17.21
17.00
17.05
17.10
17.04
16.93
16.28
16.61
16.52
16.31
16.15
106.49
106.49
107.22
116.18
116.88
105.00
110.82
110.82
97.50
94.44
102.66
106.66
97.52
96.82
92.81
94.45
94.45
92.06
92.06
87.28
93.28
93.28
83.89
84.37
84.37
83.03
84.29
84.47
83.99
77.56
79.35
116.88
Max
Min
11.39
Source: THP, CHP, BHP, KHP (DGPC)
CHP (MW)
THP (MW)
KHP (MW)
Min
Ava
Max
Min
Ava
Max
Min
Ava
89.00
98.47
260.00
180.00
214.58
20.52
15.99
98.64
101.65
220.00
210.00
210.42
24.65
16.17
94.24
98.72
240.00
200.00
213.33
20.36
20.17
102.54
107.14
350.00
220.00
255.42
23.25
20.21
102.00
113.52
240.00
220.00
235.00
23.35
20.51
96.00
99.71
240.00
170.00
200.29
21.69
20.48
99.00
103.71
240.00
210.00
223.33
20.97
15.57
94.58
101.28
230.00
200.00
207.92
20.82
20.41
94.44
95.77
200.00
200.00
200.00
20.90
15.80
88.00
91.14
200.00
180.00
185.00
20.83
16.28
91.48
94.86
200.00
180.00
196.67
21.00
15.67
86.00
96.36
200.00
180.00
192.08
21.68
15.00
86.00
93.05
220.00
150.00
201.67
20.86
15.42
89.56
93.12
200.00
180.00
183.33
32.89
15.33
86.00
88.75
190.00
180.00
187.50
21.12
15.79
84.21
91.70
190.00
180.00
187.92
31.49
10.48
84.21
89.71
210.00
180.00
184.58
21.33
15.77
84.08
88.02
190.00
160.00
171.67
20.45
15.18
84.08
87.74
200.00
180.00
187.50
20.42
16.01
84.08
85.95
200.00
90.00
170.00
26.79
15.56
84.08
87.20
190.00
170.00
177.92
24.79
15.55
83.37
87.19
190.00
170.00
177.92
20.86
15.36
82.13
83.00
180.00
170.00
173.33
20.97
15.25
82.00
82.91
200.00
170.00
182.92
21.98
15.02
81.94
83.08
280.00
170.00
186.25
21.65
15.91
72.46
76.86
180.00
160.00
171.67
26.20
11.28
74.53
78.32
170.00
160.00
165.00
22.10
15.86
83.99
84.30
190.00
170.00
181.67
20.77
15.84
74.71
79.36
320.00
140.00
167.50
22.17
12.30
74.71
75.59
180.00
140.00
157.50
16.42
12.96
77.56
78.34
180.00
160.00
168.33
27.19
12.95
350.00
32.89
72.46
90.00
10.48
Plants Generation
400.00
350.00
300.00
BHP (Max)
BHP (Min)
Generation (MW)
250.00
BHP (Ava)
KHP (Max)
KHP (Min)
200.00
KHP (Ava)
CHP (Max)
CHP (Min)
150.00
CHP (Ava)
THP (Max)
100.00
THP (Min)
THP (Ava)
50.00
0.00
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Date
Page 19 of 44
19.36
20.14
20.24
21.35
21.59
20.84
19.42
20.60
19.06
19.01
18.64
18.63
18.69
19.56
18.26
19.53
17.12
17.67
17.50
17.47
17.27
16.77
17.26
17.29
17.14
17.54
17.36
17.33
17.83
15.12
16.74
Feb-15
Date
Max
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
16.33
17.22
17.91
17.12
15.81
16.15
16.16
16.05
17.08
16.19
16.03
16.64
23.69
16.70
15.65
16.63
16.12
15.43
15.54
15.23
15.23
15.48
14.98
16.51
15.65
15.36
19.00
19.00
BHP (MW)
Min
Ava
15.56
13.56
10.56
13.82
15.40
6.76
15.04
15.38
13.15
15.31
15.40
14.38
5.11
12.57
15.24
15.00
15.02
14.82
14.76
14.53
14.71
14.30
14.16
14.15
14.37
14.54
13.88
13.88
Max
15.99
15.73
15.59
15.87
15.62
15.62
15.58
15.63
15.34
15.64
15.61
15.83
14.70
15.31
15.43
15.38
15.30
15.13
15.15
14.93
14.98
14.87
14.64
14.78
15.11
14.95
15.00
15.00
95.00
76.00
87.00
78.00
79.00
90.00
88.00
99.00
106.00
70.00
75.00
76.00
72.00
70.00
70.00
71.00
91.00
78.00
82.00
76.00
92.00
71.00
71.00
71.00
77.00
78.00
84.00
84.00
Max
23.69
Min
5.11
Source: THP, CHP, BHP, KHP (DGPC)
CHP (MW)
Min
Ava
65.00
66.00
73.00
63.00
76.71
77.00
72.00
72.00
7.00
51.00
56.00
60.00
62.00
68.00
66.00
65.00
66.00
63.00
63.00
70.00
56.00
68.00
62.00
63.00
68.00
74.00
69.00
75.00
Max
75.25
71.50
78.42
72.75
78.05
80.75
78.50
81.04
83.33
61.80
65.50
66.92
65.17
68.73
66.42
66.59
69.83
66.21
71.42
72.54
73.00
69.63
68.46
67.79
69.92
75.67
76.54
77.21
106.00
160.00
320.00
180.00
180.00
200.00
200.00
200.00
300.00
215.00
200.00
170.00
140.00
140.00
140.00
140.00
140.00
180.00
150.00
180.00
180.00
200.00
150.00
160.00
160.00
170.00
180.00
200.00
200.00
THP (MW)
KHP (MW)
Min
Ava
Max
Min
Ava
160.00
160.00
32.83
15.24
130.00
170.00
32.88
14.93
160.00
166.67
15.92
10.54
140.00
151.67
20.40
15.11
140.00
156.25
21.89
15.24
130.00
172.50
20.93
14.09
170.00
182.92
21.93
15.10
140.00
222.08
15.76
15.13
120.00
171.25
23.06
15.11
150.00
176.67
20.91
15.04
130.00
140.83
21.03
12.24
140.00
140.00
15.75
15.04
140.00
140.00
26.93
10.87
140.00
140.00
21.72
15.41
130.00
137.08
15.98
14.71
140.00
140.00
22.79
15.21
140.00
162.08
28.26
14.23
140.00
146.25
30.92
12.38
140.00
160.83
15.51
12.50
150.00
160.83
22.68
13.45
140.00
167.92
21.75
15.22
140.00
146.67
21.42
15.10
140.00
150.83
22.09
14.47
140.00
152.08
22.04
14.28
150.00
154.58
21.32
14.88
160.00
169.17
26.13
15.39
150.00
167.92
25.86
15.03
150.00
169.58
21.12
15.81
320.00
7.00
32.88
120.00
10.54
Plants Generation
350.00
300.00
250.00
BHP (Max)
Generation (MW)
BHP (Min)
BHP (Ava)
200.00
KHP (Max)
KHP (Min)
KHP (Ava)
150.00
CHP (Max)
CHP (Min)
CHP (Ava)
THP (Max)
100.00
THP (Min)
THP (Ava)
50.00
0.00
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
Date
Page 20 of 44
24.82
23.27
15.17
15.86
16.58
17.14
16.17
15.48
17.99
16.32
16.26
15.25
16.24
16.51
15.21
16.49
16.26
22.22
14.49
16.17
16.50
16.44
16.06
16.47
16.97
18.32
19.05
16.87
Mar-15
Date
Max
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
14.75
16.46
22.65
15.63
15.02
14.17
14.09
14.09
14.06
14.06
13.85
14.02
14.11
14.11
14.34
14.24
14.04
15.27
15.37
13.63
13.37
13.36
13.35
14.35
13.92
15.50
15.35
17.69
14.54
18.15
26.81
26.81
BHP (MW)
Min
Ava
14.03
14.63
5.44
14.26
13.61
13.57
13.66
13.65
13.46
13.46
13.41
5.63
13.44
13.44
13.28
13.28
13.03
13.11
13.01
12.95
12.93
12.75
12.77
13.21
12.75
12.55
12.80
13.52
13.24
12.88
17.51
Max
14.34
15.68
15.32
14.87
14.23
13.93
13.92
13.86
13.77
13.77
13.64
13.07
13.76
13.76
13.81
13.74
13.50
13.56
13.96
13.24
13.16
13.07
13.12
13.66
13.28
13.32
14.29
14.58
13.91
14.12
22.19
72.00
120.00
114.00
93.00
89.00
82.00
80.00
81.00
85.00
85.00
74.00
76.00
76.00
83.00
89.00
77.00
74.00
72.00
77.00
77.00
72.00
73.00
73.00
78.00
95.00
77.00
89.00
87.00
94.00
110.00
150.00
150.00
Max
Min
5.44
Source: THP, CHP, BHP, KHP (DGPC)
CHP (MW)
THP (MW)
KHP (MW)
Min
Ava
Max
Min
Ava
Max
Min
Ava
67.00
68.71
170.00
150.00
151.67
21.51
15.18
71.00
90.83
270.00
150.00
197.92
25.32
15.11
84.00
94.58
270.00
170.00
202.92
25.79
14.35
87.00
91.50
220.00
180.00
201.25
21.12
15.51
79.00
83.25
190.00
150.00
183.33
22.94
12.62
75.00
76.54
180.00
160.00
168.75
27.24
14.74
63.00
76.79
180.00
140.00
161.25
15.79
15.22
68.00
71.29
190.00
140.00
158.75
15.94
15.11
68.00
75.71
190.00
140.00
164.58
15.99
12.38
68.00
75.21
170.00
150.00
167.50
20.85
15.12
66.00
69.46
210.00
140.00
152.50
30.90
15.76
70.00
73.71
190.00
160.00
165.00
26.08
15.14
73.00
74.38
190.00
160.00
165.42
25.56
15.05
73.00
77.42
180.00
160.00
168.75
24.35
15.26
69.00
75.92
180.00
160.00
166.25
25.35
14.99
73.00
74.58
180.00
150.00
170.42
28.87
15.00
69.00
71.25
160.00
150.00
151.67
23.29
15.65
62.00
67.71
160.00
150.00
154.58
25.51
15.51
68.00
71.46
180.00
140.00
150.83
21.65
15.57
70.00
72.25
180.00
160.00
165.83
20.75
15.22
66.00
70.21
160.00
140.00
152.92
24.97
15.12
68.00
70.17
160.00
140.00
156.67
21.55
16.11
68.00
71.42
160.00
150.00
155.00
21.28
13.68
72.00
75.42
180.00
160.00
169.17
21.46
10.22
72.00
77.46
180.00
160.00
170.00
21.55
15.18
71.00
73.21
180.00
160.00
165.00
22.95
15.22
74.00
81.42
250.00
160.00
178.33
22.59
15.76
72.00
77.50
200.00
160.00
169.58
26.20
16.13
79.00
82.83
190.00
180.00
180.83
30.37
15.53
46.00
88.50
220.00
180.00
192.92
24.90
15.21
101.00
126.67
404.00
220.00
296.88
49.35
22.55
404.00
49.35
46.00
140.00
10.22
17.24
18.02
17.97
18.08
17.65
16.76
15.52
15.69
14.57
17.59
18.02
17.94
17.76
18.63
17.63
16.18
18.27
18.41
17.81
17.76
19.26
18.09
18.61
17.63
18.26
19.19
19.52
20.02
22.39
20.81
36.02
Plants Generation
450.00
400.00
350.00
BHP (Max)
Generation (MW)
300.00
BHP (Min)
BHP (Ava)
KHP (Max)
250.00
KHP (Min)
KHP (Ava)
200.00
CHP (Max)
CHP (Min)
CHP (Ava)
150.00
THP (Max)
THP (Min)
100.00
THP (Ava)
50.00
0.00
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Date
Page 21 of 44
Annexure- II
Jan-15
0:00
1:00
2:00
3:00
4:00
5:00
6:00
7:00
8:00
9:00
10:00
11:00
12:00
13:00
14:00
15:00
16:00
17:00
18:00
19:00
20:00
21:00
22:00
23:00
Max
267.15
254.50
256.76
260.19
256.34
263.89
269.76
289.72
303.90
298.40
304.12
303.23
297.44
291.66
292.40
290.15
288.80
303.07
323.06
324.23
307.40
295.20
280.52
266.52
Min
216.91
215.05
212.55
217.10
219.63
227.35
239.42
257.43
250.51
224.24
224.24
197.19
200.40
188.83
180.62
187.04
202.96
237.15
268.43
271.67
259.59
253.90
221.40
212.95
Ava
246.94
241.99
241.97
241.45
241.10
246.99
255.14
274.09
285.65
282.49
278.98
270.25
267.25
261.07
259.22
260.91
264.95
278.42
303.00
306.77
284.33
275.68
260.02
239.92
324.23
180.62
National Load
350.00
300.00
200.00
Maximum
150.00
Minimum
Average
100.00
50.00
0.00
0:00
1:00
2:00
3:00
4:00
5:00
6:00
7:00
8:00
9:00
10:00
11:00
12:00
13:00
14:00
15:00
16:00
17:00
18:00
19:00
20:00
21:00
22:00
23:00
Load (MW)
250.00
Hour
Page 22 of 44
Feb-15
0:00
1:00
2:00
3:00
4:00
5:00
6:00
7:00
8:00
9:00
10:00
11:00
12:00
13:00
14:00
15:00
16:00
17:00
18:00
19:00
20:00
21:00
22:00
23:00
Max
233.34
231.13
224.55
223.02
222.06
224.44
230.01
260.06
259.23
253.50
253.99
250.70
252.23
246.85
242.22
240.10
241.74
247.28
269.75
280.31
273.43
267.09
254.93
242.02
Min
176.32
173.99
172.27
163.82
159.42
159.88
173.36
205.19
202.48
189.21
192.65
191.97
191.54
182.15
171.26
173.60
174.15
187.71
196.38
223.62
210.30
206.40
193.94
183.49
Ava
210.20
204.78
203.26
201.53
202.99
206.06
213.23
234.07
236.36
229.83
227.62
224.01
224.17
216.58
211.53
213.28
216.84
225.79
243.55
254.76
247.40
242.90
230.66
217.80
280.31
159.42
National Load
300.00
250.00
150.00
Maximum
Minimum
100.00
Average
50.00
0.00
0:00
1:00
2:00
3:00
4:00
5:00
6:00
7:00
8:00
9:00
10:00
11:00
12:00
13:00
14:00
15:00
16:00
17:00
18:00
19:00
20:00
21:00
22:00
23:00
Load (MW)
200.00
Hour
Page 23 of 44
Mar-15
0:00
1:00
2:00
3:00
4:00
5:00
6:00
7:00
8:00
9:00
10:00
11:00
12:00
13:00
14:00
15:00
16:00
17:00
18:00
19:00
20:00
21:00
22:00
23:00
Max
235.23
234.61
238.78
231.82
236.10
240.89
257.77
281.87
264.78
257.29
277.22
275.51
272.34
267.65
254.83
258.95
265.17
263.25
272.97
296.70
287.27
276.54
263.75
249.97
Min
196.11
181.76
177.19
177.55
178.28
179.26
198.17
217.49
218.54
212.61
198.75
174.95
187.05
174.23
166.43
181.12
196.26
169.06
213.38
242.67
217.37
212.03
213.94
179.11
Ava
214.89
210.27
209.29
208.60
208.81
212.43
231.59
253.78
244.56
237.42
243.23
239.37
241.85
233.68
229.39
232.34
234.61
232.15
251.75
274.15
263.53
253.51
234.92
219.51
296.70
166.43
National Load
350.00
300.00
200.00
Maximum
150.00
Minimum
Average
100.00
50.00
0.00
0:00
1:00
2:00
3:00
4:00
5:00
6:00
7:00
8:00
9:00
10:00
11:00
12:00
13:00
14:00
15:00
16:00
17:00
18:00
19:00
20:00
21:00
22:00
23:00
Load (MW)
250.00
Hour
Page 24 of 44
Annexure- III
Binaguri
Jan-15
Date
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Max
108.00
100.00
103.00
219.00
146.00
112.00
226.00
127.00
105.00
90.00
85.00
90.00
83.00
80.00
115.00
89.00
75.00
85.00
77.00
77.00
70.00
68.00
74.00
98.00
132.00
67.00
45.00
69.00
93.00
52.00
78.00
226.00
Export (MW)
Min
52.00
40.00
69.00
64.00
46.00
9.00
72.00
42.00
36.00
13.00
30.00
15.00
31.00
31.00
20.00
20.00
27.00
8.00
24.00
11.00
16.00
25.00
7.00
20.00
27.00
3.00
9.00
23.00
3.00
4.00
2.00
Ava
74.92
80.79
83.92
137.46
111.42
70.29
102.92
86.46
76.21
57.29
66.38
63.13
68.52
62.92
65.13
58.96
59.46
46.79
58.54
41.92
48.54
50.67
45.83
66.13
57.00
43.27
31.54
47.58
42.35
26.52
45.91
Max
No Import
No Import
No Import
No Import
No Import
No Import
No Import
No Import
No Import
No Import
No Import
No Import
7.00
No Import
No Import
No Import
No Import
No Import
No Import
No Import
No Import
No Import
No Import
No Import
No Import
5.00
No Import
No Import
17.00
9.00
1.00
17.00
Import (MW)
Min
Ava
No Import No Import
No Import No Import
No Import No Import
No Import No Import
No Import No Import
No Import No Import
No Import No Import
No Import No Import
No Import No Import
No Import No Import
No Import No Import
No Import No Import
7.00
7.00
No Import No Import
No Import No Import
No Import No Import
No Import No Import
No Import No Import
No Import No Import
No Import No Import
No Import No Import
No Import No Import
No Import No Import
No Import No Import
No Import No Import
5.00
5.00
No Import No Import
No Import No Import
4.00
11.00
9.00
9.00
1.00
1.00
Max
Min
2.00
Source: THP, CHP, BHP, KHP (DGPC), TD (BPC)
1.00
Max
35.95
14.53
16.38
28.74
18.72
18.90
25.87
30.34
24.66
11.73
18.01
8.29
4.52
20.80
21.56
No Export
No Export
No Export
No Export
No Export
No Export
No Export
No Export
10.00
No Export
No Export
No Export
No Export
No Export
No Export
No Export
35.95
Birpara
Export (MW)
Import (MW)
Min
Ava
Max
Min
1.95
13.81
30.00
0.05
0.02
6.23
15.98
1.47
4.18
13.35
21.82
1.47
1.38
12.40
6.53
2.62
1.72
9.54
5.28
0.28
1.00
15.20
28.40
2.00
5.90
14.60
11.12
0.10
1.23
12.85
5.77
5.77
8.09
13.49
7.34
7.34
0.09
3.94
14.58
0.91
0.01
6.93
6.27
0.99
3.29
5.22
12.32
0.08
2.83
3.57
10.08
0.17
0.80
12.55
11.17
3.17
0.94
7.92
19.44
0.25
No Export No Export
20.70
3.70
No Export No Export
30.18
8.07
No Export No Export
34.56
9.59
No Export No Export
31.56
4.00
No Export No Export
37.56
16.00
No Export No Export
39.79
9.12
No Export No Export
39.21
6.99
No Export No Export
37.17
13.78
0.35
4.98
25.78
14.78
No Export No Export
28.29
8.29
No Export No Export
39.77
9.45
No Export No Export
32.05
10.41
No Export No Export
32.07
6.07
No Export No Export
39.95
11.89
No Export No Export
36.00
6.89
No Export No Export
26.47
6.47
39.95
0.01
0.05
Ava
16.02
7.58
12.37
5.44
2.88
15.04
6.42
5.77
7.34
7.63
3.10
6.73
5.12
7.12
10.15
11.23
21.94
23.92
19.58
25.15
27.05
22.55
26.02
20.34
19.51
26.67
23.90
20.80
24.97
25.06
17.89
Max
No Export
No Export
No Export
No Export
No Export
No Export
No Export
No Export
No Export
No Export
No Export
No Export
No Export
No Export
No Export
No Export
No Export
No Export
No Export
No Export
No Export
No Export
No Export
No Export
No Export
No Export
No Export
No Export
No Export
No Export
No Export
0.00
Salakoti and Rangia
Export (MW)
Import (MW)
Min
Ava
Max
Min
No Export No Export
35.18
12.30
No Export No Export
35.74
11.10
No Export No Export
35.61
12.24
No Export No Export
27.36
8.80
No Export No Export
39.21
6.27
No Export No Export
39.75
10.59
No Export No Export
36.43
10.31
No Export No Export
41.40
13.15
No Export No Export
38.75
14.17
No Export No Export
39.42
14.30
No Export No Export
34.91
14.49
No Export No Export
38.43
14.67
No Export No Export
40.06
11.67
No Export No Export
31.06
7.92
No Export No Export
34.59
14.97
No Export No Export
29.95
11.38
No Export No Export
31.39
17.96
No Export No Export
33.37
15.30
No Export No Export
35.53
15.46
No Export No Export
31.22
14.42
No Export No Export
29.08
12.16
No Export No Export
30.09
14.62
No Export No Export
32.16
15.35
No Export No Export
34.45
14.06
No Export No Export
31.68
16.53
No Export No Export
27.97
12.92
No Export No Export
30.31
10.67
No Export No Export
30.78
13.57
No Export No Export
24.12
0.06
No Export No Export
37.43
2.07
No Export No Export
33.73
6.19
41.40
0.00
0.06
Ava
20.61
19.16
21.18
15.19
20.50
20.83
18.88
22.60
24.44
24.15
23.45
24.03
22.45
20.06
23.13
21.70
24.25
21.14
24.00
22.92
21.13
22.86
23.71
24.18
21.69
19.91
17.58
19.50
14.69
19.94
21.60
Export to India
250.00
200.00
Binaguri (Max)
150.00
Export (MW)
Binaguri (Min)
Binaguri (Ava)
Birpara (Max)
Birpara (Min)
Birpara (Ava)
100.00
Salakoti (Max)
Salakoti (Min)
Salakoti (Ava)
50.00
0.00
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Date
Page 25 of 44
Import from India
45.00
40.00
35.00
30.00
Binaguri (Max)
Import (MW)
Binaguri (Min)
25.00
Binaguri (Ava)
Birpara (Max)
Birpara (Min)
20.00
Birpara (Ava)
Salakoti (Max)
15.00
Salakoti (Min)
Salakoti (Ava)
10.00
5.00
0.00
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Date
Binaguri
Feb-15
Date
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
Max
53.00
177.00
78.00
70.00
58.00
90.00
74.00
162.00
52.00
46.00
45.00
35.00
33.00
32.00
35.00
40.00
72.00
51.00
64.00
77.00
90.00
45.00
58.00
56.00
55.00
76.00
89.00
90.00
Export (MW)
Min
4.00
7.00
20.00
5.00
10.00
8.00
19.00
11.00
5.00
15.00
6.00
6.00
3.00
2.00
1.00
4.00
18.00
8.00
14.00
2.00
4.00
2.00
3.00
6.00
9.00
26.00
27.00
35.00
Ava
35.38
58.90
47.38
27.83
30.08
54.09
55.67
100.52
28.58
28.84
20.89
18.78
19.24
18.45
17.47
22.68
37.25
35.90
40.92
41.18
45.00
31.04
38.04
30.75
33.08
46.13
53.96
54.00
Max
No Import
41.00
No Import
1.00
No Import
17.00
No Import
7.00
No Import
31.00
17.00
24.00
27.00
16.00
17.00
18.00
No Import
13.00
No Import
2.00
No Import
No Import
1.00
No Import
No Import
No Import
No Import
No Import
Max
177.00
Min
1.00
Source: THP, CHP, BHP, KHP (DGPC), TD (BPC)
Birpara
Import (MW)
Export (MW)
Import (MW)
Min
Ava
Max
Min
Ava
Max
Min
Ava
No Import No Import
2.00
2.00
2.00
37.00
1.00
16.67
12.00
24.00
22.79
18.79
21.79
32.21
3.21
16.44
No Import No Import
21.12
1.12
11.37
17.26
1.88
9.53
1.00
1.00
0.55
0.55
0.55
20.45
4.45
12.84
No Import No Import
1.00
1.00
1.00
21.00
1.00
13.07
15.00
16.00
14.00
3.00
9.50
26.00
1.00
15.29
No Import No Import
3.00
3.00
3.00
28.00
1.00
13.59
7.00
7.00
24.00
1.00
9.00
12.00
1.00
4.70
No Import No Import
19.00
3.00
10.71
50.00
20.00
34.00
1.00
12.00
3.00
2.00
2.38
50.00
15.00
36.80
2.00
11.40
1.00
1.00
1.00
20.00
2.00
10.74
5.00
16.83 No Export No Export No Export
34.00
3.00
20.71
1.00
14.71
4.00
2.00
2.67
28.00
4.00
19.00
2.00
11.14 No Export No Export No Export
24.00
1.00
8.82
2.00
10.00 No Export No Export No Export
28.40
1.00
17.01
6.00
10.60
10.00
5.00
9.00
30.53
5.00
17.39
No Import No Import
32.00
1.00
10.00
11.00
2.00
8.25
1.00
6.50
9.00
1.00
4.33
22.00
1.00
8.40
No Import No Import
19.00
1.00
8.67
16.00
1.00
7.89
1.00
1.50
32.00
2.00
10.50
5.00
3.00
4.00
No Import No Import
30.12
2.17
18.38 No Import No Import No Import
No Import No Import
35.00
0.14
14.67 No Import No Import No Import
1.00
1.00
36.00
2.00
17.29 No Import No Import No Import
No Import No Import
39.00
3.00
21.79 No Import No Import No Import
No Import No Import
57.00
2.00
24.42 No Import No Import No Import
No Import No Import
58.00
13.00
39.29 No Import No Import No Import
No Import No Import
59.00
6.00
37.04 No Import No Import No Import
No Import No Import
57.00
21.00
40.50 No Import No Import No Import
41.00
59.00
1.00
50.00
0.14
Page 26 of 44
Max
1.60
No Export
2.25
0.55
3.60
5.65
No Export
No Export
No Export
No Export
No Export
No Export
No Export
No Export
No Export
No Export
No Export
No Export
No Export
No Export
No Export
No Export
No Export
No Export
No Export
No Export
No Export
No Export
Salakoti and Rangia
Export (MW)
Import (MW)
Min
Ava
Max
Min
0.29
0.74
33.75
1.64
No Export No Export
44.82
3.69
2.25
2.25
39.85
15.07
0.55
0.55
31.21
17.59
0.97
1.91
29.30
0.25
5.65
5.65
32.86
1.36
No Export No Export
27.36
11.30
No Export No Export
25.84
11.66
No Export No Export
26.02
12.62
No Export No Export
29.44
15.05
No Export No Export
29.91
10.98
No Export No Export
30.42
15.92
No Export No Export
34.05
14.11
No Export No Export
28.18
14.77
No Export No Export
33.26
15.46
No Export No Export
32.94
16.41
No Export No Export
36.57
14.55
No Export No Export
34.77
6.23
No Export No Export
35.85
19.29
No Export No Export
35.42
15.20
No Export No Export
34.52
16.76
No Export No Export
33.15
6.02
No Export No Export
31.68
15.48
No Export No Export
32.11
20.50
No Export No Export
33.69
14.69
No Export No Export
32.56
7.50
No Export No Export
34.34
3.62
No Export No Export
34.06
17.10
5.65
1.00
44.82
0.29
0.25
Ava
17.86
23.69
23.01
24.29
18.27
14.60
17.59
16.92
18.16
20.01
18.90
20.85
21.50
20.32
22.08
23.56
25.25
23.37
24.88
24.68
25.18
21.65
21.72
24.57
24.54
20.53
17.74
23.97
Export to India
200.00
180.00
160.00
140.00
Binaguri (Max)
Export (MW)
120.00
Binaguri (Min)
Binaguri (Ava)
100.00
Birpara (Max)
Birpara (Min)
Birpara (Ava)
80.00
Salakoti (Max)
Salakoti (Min)
60.00
Salakoti (Ava)
40.00
20.00
0.00
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
Date
Import from India
60.00
50.00
40.00
Import (MW)
Binaguri (Max)
Binaguri (Min)
Binaguri (Ava)
30.00
Birpara (Max)
Birpara (Min)
Birpara (Ava)
Salakoti (Max)
20.00
Salakoti (Min)
Salakoti (Ava)
10.00
0.00
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
Date
Page 27 of 44
Binaguri
Mar-15
Date
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Max
72.00
146.00
181.00
99.00
90.00
77.00
73.00
91.00
91.00
65.00
56.00
58.00
48.00
162.00
69.00
154.00
146.00
51.00
43.00
83.00
52.00
55.00
53.00
58.00
57.00
42.00
108.00
103.00
105.00
72.00
283.00
283.00
Export (MW)
Min
10.00
28.00
34.00
46.00
15.00
11.00
9.00
1.00
26.00
13.00
6.00
1.00
20.00
17.00
18.00
49.00
8.00
2.00
10.00
11.00
12.00
6.00
2.00
12.00
8.00
2.00
12.00
9.00
36.00
15.00
129.00
Ava
40.50
81.38
88.96
80.83
58.42
49.54
47.17
51.33
45.04
41.25
27.80
37.61
34.13
57.46
45.92
81.00
117.33
30.20
31.54
43.04
32.00
36.08
29.63
38.38
38.10
29.19
54.92
55.92
66.29
49.58
186.79
Birpara
Max
No Import
No Import
No Import
No Import
No Import
No Import
No Import
8.00
No Import
No Import
19.00
1.00
No Import
No Import
No Import
No Import
13.00
10.00
No Import
No Import
4.00
No Import
No Import
No Import
5.00
6.00
No Import
No Import
No Import
No Import
No Import
19.00
Import (MW)
Min
Ava
No Import No Import
No Import No Import
No Import No Import
No Import No Import
No Import No Import
No Import No Import
No Import No Import
2.00
5.67
No Import No Import
No Import No Import
7.00
11.25
1.00
1.00
No Import No Import
No Import No Import
No Import No Import
No Import No Import
2.00
7.50
1.00
5.00
No Import No Import
No Import No Import
4.00
4.00
No Import No Import
No Import No Import
No Import No Import
2.00
3.50
1.00
3.33
No Import No Import
No Import No Import
No Import No Import
No Import No Import
No Import No Import
Max
Min
1.00
Source: THP, CHP, BHP, KHP (DGPC), TD (BPC)
1.00
Max
42.00
75.00
62.00
47.00
39.00
45.00
38.00
16.00
28.00
30.00
21.00
16.00
30.00
38.00
27.00
34.00
21.00
34.00
49.00
39.00
31.00
40.00
48.00
44.00
54.00
60.00
52.00
34.00
67.00
37.00
104.00
104.00
Export (MW)
Min
3.00
6.00
3.00
12.00
1.00
2.00
1.00
1.00
1.00
1.00
1.00
3.00
5.00
6.00
1.00
2.00
9.00
1.00
11.00
5.00
2.00
6.00
11.00
2.00
12.00
5.00
9.00
9.00
6.00
5.00
25.00
Ava
21.63
33.33
34.79
30.96
16.87
16.87
20.53
10.07
8.84
12.20
12.29
8.61
13.74
18.30
17.00
18.56
15.14
12.86
33.24
19.17
17.55
16.09
28.83
24.13
34.70
29.91
31.22
20.60
26.75
18.83
68.54
Max
No Import
No Import
No Import
No Import
1.00
1.00
14.00
9.00
27.00
15.00
34.00
7.00
22.00
103.00
7.00
95.00
110.00
4.00
15.00
3.00
7.00
No Import
3.00
No Import
2.00
6.00
1.00
32.00
No Import
22.00
No Import
110.00
1.00
Import (MW)
Min
Ava
No Import No Import
No Import No Import
No Import No Import
No Import No Import
1.00
1.00
1.00
1.00
5.00
9.00
1.00
4.38
2.00
10.00
1.00
5.00
4.00
10.20
7.00
7.00
3.00
8.20
2.00
77.00
1.00
2.60
2.00
62.50
21.00
92.35
4.00
4.00
3.00
7.67
3.00
3.00
2.00
4.50
No Import No Import
3.00
3.00
No Import No Import
2.00
2.00
6.00
6.00
1.00
1.00
14.00
20.25
No Import No Import
2.00
6.33
No Import No Import
1.00
Max
No Export
5.85
8.15
7.65
3.45
No Export
No Export
0.05
2.65
8.55
8.65
9.95
11.75
3.85
26.65
1.65
9.25
3.05
No Export
No Export
6.75
2.35
5.75
7.65
19.75
No Export
2.34
3.43
16.65
13.85
36.54
36.54
Salakoti and Rangia
Export (MW)
Import (MW)
Min
Ava
Max
Min
No Export No Export
31.06
18.63
0.25
2.47
36.44
18.64
0.55
4.15
24.91
18.18
2.35
4.52
32.14
16.95
1.65
2.60
31.72
16.12
No Export No Export
28.65
6.70
No Export No Export
30.56
11.59
0.05
0.05
27.68
12.87
0.55
1.69
33.04
10.74
1.35
6.65
25.91
12.26
3.55
6.38
27.03
12.83
2.65
6.16
35.17
12.93
1.45
7.62
33.66
18.11
1.85
3.15
30.11
13.01
0.55
8.13
28.44
18.86
0.05
0.97
31.89
20.16
6.35
7.45
31.89
13.84
2.05
2.55
28.67
18.67
No Export No Export
29.41
15.09
No Export No Export
31.46
2.91
0.45
3.53
31.75
16.95
0.25
1.52
31.28
18.10
2.35
3.55
36.26
17.75
0.55
5.02
24.83
12.36
1.35
9.54
30.99
8.99
No Export No Export
28.26
14.65
1.04
1.69
27.39
1.42
0.51
1.35
17.15
0.32
0.62
12.10
21.54
2.51
3.15
9.07
32.29
5.00
6.75
18.93
8.65
5.68
36.44
0.05
0.32
Ava
23.96
23.14
21.11
23.72
21.19
19.71
18.88
17.66
18.61
18.26
17.73
20.72
27.56
22.06
22.67
24.91
20.89
21.46
22.54
22.47
23.77
22.58
24.33
18.49
21.08
22.34
16.86
6.75
10.63
15.62
7.18
Export to India
300.00
250.00
200.00
Export (MW)
Binaguri (Max)
Binaguri (Min)
Binaguri (Ava)
150.00
Birpara (Max)
Birpara (Min)
Birpara (Ava)
Salakoti (Max)
100.00
Salakoti (Min)
Salakoti (Ava)
50.00
0.00
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Date
Page 28 of 44
Import from India
120.00
100.00
80.00
Import (MW)
Binaguri (Max)
Binaguri (Min)
Binaguri (Ava)
60.00
Birpara (Max)
Birpara (Min)
Birpara (Ava)
Salakoti (Max)
40.00
Salakoti (Min)
Salakoti (Ava)
20.00
0.00
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Date
Page 29 of 44
Annexure- IV
Bus Frequency at Semtokha
Substation
Jan-15
Date
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Max
50.30
50.30
50.10
50.10
50.30
50.20
50.00
50.10
50.00
50.10
50.10
50.00
50.00
50.10
50.00
50.00
50.10
50.10
50.00
50.00
50.00
50.10
50.10
50.00
50.20
50.10
50.10
50.00
50.10
50.10
50.00
50.30
Min
49.80
49.70
49.80
49.90
49.70
49.80
49.60
49.70
49.70
49.70
49.80
49.80
49.80
49.90
49.80
49.70
49.80
49.60
49.70
49.70
49.70
49.80
49.80
49.80
49.70
49.80
49.70
49.80
49.80
49.80
49.80
Ava
50.00
49.99
49.93
49.99
49.93
49.93
49.89
49.90
49.93
49.94
49.98
49.95
49.96
49.99
49.95
49.90
49.95
49.94
49.92
49.92
49.88
49.96
49.92
49.95
49.96
49.98
49.95
49.94
49.95
49.95
49.96
Max
Min
49.60
Source: TD (BPC), KHP (DGPC)
50.50
Bus Frequency at Kurichhu
Hydropower Plant
Max
50.32
50.35
50.15
50.17
50.25
50.15
50.12
50.08
50.09
50.09
50.09
50.17
50.09
50.17
50.10
50.09
50.09
50.15
50.12
50.11
50.29
50.30
50.08
50.15
50.20
50.32
50.26
50.12
50.15
50.17
50.16
50.35
Min
49.92
49.84
49.77
49.93
49.78
49.80
49.65
49.78
49.79
49.74
49.50
49.90
49.84
49.81
49.63
49.72
49.81
49.72
49.50
49.75
49.79
49.88
49.85
49.83
49.62
49.88
49.80
49.86
49.87
49.85
49.86
Ava
50.07
50.06
49.98
50.04
50.01
49.99
49.96
49.96
49.97
49.97
49.97
50.01
50.00
50.04
49.97
49.96
49.97
49.98
49.94
49.94
49.97
50.05
49.97
49.99
49.98
50.06
49.99
49.97
50.01
50.00
50.03
49.50
Bus Frequency at Semtokha Substation and Kurichhu
Hydropower Plant
Frequency (Hz)
50.00
49.50
49.00
48.50
48.00
1
2
3
4
5
SEM (Max)
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
SEM (Min)
SEMDate
(Ava)
KHP (Max)
Page 30 of 44
KHP (Min)
KHP (Ava)
Feb-15
Date
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
Bus Frequency at Semtokha
Substation
Max
50.20
50.20
50.10
50.10
50.00
50.10
50.00
50.10
50.00
50.10
50.10
50.10
50.00
50.00
50.10
50.10
50.10
50.00
50.10
50.00
50.10
50.00
50.10
50.10
50.10
50.10
50.10
50.10
Min
49.90
49.70
49.80
49.90
49.80
49.80
49.80
49.90
49.80
49.80
49.70
49.80
49.70
49.70
49.70
49.70
49.70
49.70
49.90
49.80
49.80
49.80
49.80
49.80
49.90
49.80
49.80
49.80
Bus Frequency at Kurichhu
Hydropower Plant
Ava
50.00
49.94
49.96
49.98
49.95
49.95
49.95
49.98
49.95
49.93
49.94
49.95
49.91
49.89
49.92
49.92
49.96
49.95
49.97
49.93
49.96
49.95
49.94
49.93
49.98
49.96
49.97
49.99
Max
50.20
Min
49.70
Source: TD (BPC), KHP (DGPC)
51.00
Max
50.13
50.24
50.18
50.16
50.16
50.11
50.10
50.17
50.09
50.08
50.12
50.12
50.09
50.05
50.15
50.15
50.12
50.09
50.09
50.13
50.09
50.08
50.10
50.10
50.15
50.15
50.50
50.11
Min
49.95
49.74
49.75
49.86
49.86
49.84
49.84
49.85
49.70
49.80
49.51
49.80
49.80
49.82
49.82
49.72
49.77
49.84
49.91
49.89
49.84
49.86
49.84
49.83
49.90
49.85
49.91
49.92
Ava
50.02
49.93
50.00
50.01
50.00
50.00
49.98
50.00
49.98
49.95
49.97
49.98
49.96
49.95
49.96
49.96
49.99
49.99
50.02
50.01
49.98
50.00
49.99
49.98
50.02
50.02
50.02
50.02
50.50
49.51
Bus Frequency at Semtokha Substation and Kurichhu
Hydropower Plant
50.50
Frequency (Hz)
50.00
SEM (Max)
SEM (Min)
49.50
SEM (Ava)
KHP (Max)
KHP (Min)
KHP (Ava)
49.00
48.50
48.00
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
Date
Page 31 of 44
Bus Frequency at Semtokha
Substation
Mar-14
Date
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Max
50.20
50.50
50.10
50.10
50.10
50.20
50.20
50.20
50.10
50.10
50.00
50.10
50.00
50.10
50.10
50.20
50.10
50.10
50.00
50.00
50.00
50.20
50.10
50.10
50.10
50.10
50.10
50.10
50.20
50.20
50.20
50.50
Min
49.80
49.80
49.70
49.80
49.80
49.80
49.80
49.80
49.70
49.80
49.70
49.90
49.80
49.80
49.80
49.80
49.80
49.80
49.80
49.70
49.70
49.30
49.80
49.80
49.70
49.70
49.80
49.80
49.70
49.90
49.80
Ava
50.01
49.98
49.96
49.95
49.94
49.99
49.97
49.99
49.93
49.95
49.91
49.96
49.92
49.93
49.93
49.99
49.94
49.96
49.90
49.87
49.84
49.89
49.93
49.90
49.93
49.93
49.96
49.95
49.95
50.01
49.98
Max
Min
49.30
Source: TD (BPC), KHP (DGPC)
51.00
Bus Frequency at Kurichhu
Hydropower Plant
Max
50.41
50.38
50.13
50.11
50.17
50.24
50.19
50.17
50.11
50.10
50.07
50.09
50.16
50.12
50.28
50.27
50.06
50.13
50.09
50.05
50.08
50.23
50.16
50.15
50.12
50.11
50.21
50.12
50.16
50.21
50.26
50.41
Min
49.88
49.79
49.73
49.87
49.78
49.87
49.82
49.88
49.85
49.88
49.78
49.90
49.86
49.81
49.93
49.88
49.86
49.86
49.84
49.55
49.78
49.73
49.80
49.78
49.80
49.68
49.80
49.78
49.82
49.91
49.82
Ava
50.05
50.01
49.98
50.02
50.00
50.04
50.01
50.02
50.00
50.01
49.94
50.00
50.00
50.00
50.03
50.03
49.98
49.98
49.97
49.90
49.93
49.97
49.98
49.94
49.97
49.96
50.01
49.99
50.02
50.03
50.01
49.55
Bus Frequency at Semtokha Substation and Kurichhu
Hydropower Plant
50.50
Frequency (Hz)
50.00
SEM (Max)
SEM (Min)
49.50
SEM (Ava)
KHP (Max)
KHP (Min)
KHP (Ava)
49.00
48.50
48.00
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Date
Page 32 of 44
Annexure- V
Jan-15
400kV Bus Voltage (kV)
Date
Max
Min
Ava
418.50
406.00
412.58
1
417.50
401.50
411.40
2
420.50
402.00
414.13
3
418.50
403.50
412.15
4
417.50
407.50
412.06
5
414.50
402.00
410.71
6
412.50
402.50
408.44
7
419.50
401.50
409.92
8
413.50
401.50
408.48
9
412.50
400.50
406.02
10
415.50
397.50
407.27
11
415.00
399.00
407.13
12
412.50
398.50
404.85
13
414.50
400.00
406.71
14
414.50
399.50
407.60
15
414.50
401.00
407.50
16
414.00
400.50
407.75
17
412.00
401.50
407.31
18
412.50
398.50
405.58
19
410.50
400.50
405.98
20
412.50
401.50
407.08
21
410.00
401.50
406.19
22
411.50
411.50
411.50
23
416.00
401.50
409.60
24
419.50
405.50
412.40
25
420.50
405.50
413.75
26
419.50
402.50
408.77
27
415.50
399.00
408.25
28
413.00
399.50
407.21
29
413.00
397.50
404.56
30
412.50
400.50
406.71
31
Max
420.50
Min
397.50
Source: TD, BPC
450.00
Malbase Substation
220kV Bus Voltage (kV)
Max
Min
Ava
231.00
221.50
226.58
230.00
219.00
225.88
232.00
217.00
227.33
230.50
221.00
226.67
230.50
222.00
226.35
228.50
220.00
225.77
229.00
219.00
225.23
232.00
220.00
226.54
230.00
221.50
225.96
229.50
219.00
224.69
230.50
218.50
225.02
231.00
218.50
225.67
229.00
218.50
223.96
230.00
220.00
225.21
230.50
220.00
226.13
230.00
219.50
225.31
230.00
220.00
225.44
228.00
220.00
224.94
228.50
218.00
224.00
228.00
219.00
224.08
228.00
220.00
224.69
227.50
219.00
224.23
229.00
217.00
224.13
230.00
220.50
226.35
230.00
221.00
226.15
231.50
221.00
226.50
230.00
220.00
224.63
229.50
218.00
225.06
229.00
219.00
224.73
230.00
217.00
223.04
229.00
219.00
224.71
232.00
217.00
66kV Bus Voltage (kV)
Max
Min
Ava
67.00
63.00
65.33
66.00
63.00
64.83
67.00
62.00
65.33
67.00
64.00
65.50
67.00
64.00
65.17
66.00
63.00
65.13
66.00
63.00
64.88
67.00
63.00
65.46
67.00
64.00
65.50
66.00
63.00
64.83
67.00
63.00
65.17
67.00
63.00
65.33
66.00
63.00
64.71
67.00
64.00
65.46
67.00
63.00
65.33
67.00
63.00
65.04
67.00
63.00
65.08
66.00
63.00
64.71
66.00
63.00
64.71
66.00
63.00
64.50
66.00
63.00
64.58
65.00
63.00
64.50
66.00
63.00
64.38
66.00
64.00
65.29
67.00
64.00
65.08
67.00
63.00
65.17
67.00
64.00
64.75
66.00
63.00
65.08
66.00
63.00
64.92
66.00
63.00
64.58
67.00
64.00
65.17
67.00
62.00
Nangkhor Substation
132kV Bus Voltage (kV)
Max
Min
Ava
137.07
130.00
133.99
138.60
129.60
133.62
136.40
128.90
133.81
136.90
127.80
134.43
138.10
128.40
133.92
137.60
128.60
134.16
138.00
129.20
134.30
137.70
130.70
134.00
138.10
129.16
133.45
137.50
127.00
132.78
137.60
128.20
133.70
137.90
128.00
134.70
137.60
129.60
134.11
137.40
130.00
133.57
138.50
129.60
135.38
137.70
130.00
134.43
137.90
130.60
134.33
139.00
131.60
135.41
139.00
129.40
134.64
137.20
130.50
134.15
139.20
131.30
134.88
138.80
126.80
133.71
137.70
129.30
133.93
140.20
128.80
134.42
138.10
128.50
134.25
137.70
132.10
134.52
138.90
129.20
134.43
139.00
130.40
134.42
138.30
131.40
135.25
139.60
129.60
134.75
135.80
129.00
132.67
140.20
126.80
Bus Voltage at Malbase and Nangkhor Substation
400.00
350.00
Voltage (kV)
300.00
250.00
200.00
150.00
100.00
50.00
1
2
3 400kV
4 5 (Max)
6 7 8
220kV (Min)
66kV (Ava)
400kV
(Min)
220kV
(Max)
9 10 11 12
13 14
15 16 17 18 19 20 400kV
21 22 (Ava)
23 24 25 26 27 28 29
30 31
220kV (Ava)
66kV (Max)
66kV (Min)
132kV (Max)
132kV (Min)
132kV (Ava)
Date
Page 33 of 44
Feb-15
Date
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
400kV Bus Voltage (kV)
Max
Min
Ava
412.50
401.50
408.60
414.00
398.00
406.77
414.00
401.50
407.67
413.50
400.00
407.40
413.00
399.50
406.92
412.50
398.00
405.50
413.50
397.50
404.25
411.00
400.50
407.40
414.50
397.50
406.94
413.00
397.00
406.25
412.50
397.50
406.33
409.00
397.50
404.83
409.50
399.50
404.06
411.00
399.00
404.90
410.00
403.00
406.92
415.00
393.00
404.38
409.50
390.50
403.21
414.00
398.50
408.02
417.00
403.00
409.23
415.00
400.50
406.60
413.50
402.50
407.44
413.50
401.50
408.19
414.00
402.00
408.06
413.00
400.50
407.10
411.00
400.00
406.77
411.00
403.00
407.77
417.00
400.50
409.06
415.50
402.00
408.67
Max
417.00
Min
Source: TD, BPC
Malbase Substation
220kV Bus Voltage (kV)
Max
Min
Ava
229.00
220.50
225.54
230.50
218.00
225.29
230.50
223.50
226.04
229.00
218.00
224.69
229.00
218.50
224.67
229.00
218.50
223.67
229.00
218.00
223.15
228.00
219.50
225.06
230.00
218.00
224.88
231.50
218.00
223.50
227.00
218.00
223.79
226.50
218.00
223.25
227.00
219.50
223.56
228.50
218.50
223.27
227.50
220.00
224.71
231.00
216.00
224.04
226.00
219.00
223.13
231.00
218.00
225.96
231.00
223.00
226.21
231.00
219.00
224.77
230.00
220.00
225.50
230.00
221.00
225.81
230.00
221.50
225.65
230.00
219.00
225.08
228.50
220.00
224.54
228.00
221.00
225.15
232.00
219.00
226.02
230.00
220.50
225.21
66kV Bus Voltage (kV)
Max
Min
Ava
67.00
64.00
65.33
68.00
63.00
65.50
67.00
65.00
65.50
66.00
63.00
64.92
66.00
63.00
65.17
66.00
63.00
64.58
67.00
63.00
64.46
66.00
63.00
65.38
66.00
63.00
65.04
67.00
62.00
64.54
66.00
63.00
64.92
65.00
63.00
64.50
66.00
63.00
64.92
66.00
63.00
64.54
66.00
64.00
64.96
66.00
63.00
64.54
66.00
63.00
65.04
68.00
63.00
65.83
67.00
65.00
65.75
67.00
64.00
65.29
67.00
64.00
65.63
67.00
64.00
65.71
67.00
64.00
65.67
67.00
64.00
65.33
66.00
64.00
65.25
67.00
64.00
65.58
68.00
64.00
65.79
67.00
63.00
65.42
232.00
390.50
450.00
Nangkhor Substation
132kV Bus Voltage (kV)
Max
Min
Ava
138.10
128.60
135.87
137.90
124.40
132.93
138.90
126.10
134.03
136.40
130.90
133.80
137.60
129.60
135.16
139.22
130.30
135.52
139.80
130.90
135.76
137.90
130.20
135.75
138.60
133.20
135.64
137.80
130.90
134.58
139.20
131.12
135.08
136.80
129.50
134.51
137.70
130.70
134.17
139.00
131.90
135.37
139.80
130.80
136.35
137.90
129.00
133.73
136.30
127.10
132.69
136.60
129.30
133.73
137.90
128.80
133.61
135.60
127.50
132.26
137.30
129.60
134.38
137.60
130.90
134.31
137.90
128.60
134.26
137.30
130.00
133.22
136.70
128.20
133.11
136.30
129.60
133.33
141.60
128.80
134.53
136.80
127.10
133.37
68.00
216.00
141.60
62.00
124.40
Bus Voltage at Malbase and Nangkhor Substation
400.00
350.00
400kV (Max)
400kV (Min)
Voltage (kV)
300.00
400kV (Ava)
220kV (Max)
220kV (Min)
250.00
220kV (Ava)
66kV (Max)
66kV (Min)
200.00
66kV (Ava)
132kV (Max)
150.00
132kV (Min)
132kV (Ava)
100.00
50.00
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
Date
Page 34 of 44
Mar-14
400kV Bus Voltage (kV)
Date
Max
Min
Ava
415.00
404.00
410.92
1
415.00
401.50
408.73
2
413.00
402.50
409.27
3
413.50
400.00
407.40
4
417.50
398.50
409.21
5
414.50
403.50
410.08
6
417.50
400.50
409.48
7
414.00
401.50
409.48
8
413.00
399.50
408.71
9
416.50
404.50
410.71
10
416.00
399.50
406.85
11
411.50
400.00
406.88
12
409.50
398.50
405.21
13
415.00
401.50
409.88
14
411.50
403.00
408.21
15
415.50
404.00
408.33
16
416.00
399.00
408.71
17
412.50
399.00
406.10
18
411.50
399.50
406.58
19
415.50
402.00
409.58
20
414.50
404.50
409.71
21
415.00
402.50
410.04
22
411.00
399.00
406.94
23
410.50
400.50
407.19
24
407.50
400.50
405.02
25
410.00
401.50
406.17
26
412.00
399.50
407.98
27
413.50
399.50
408.06
28
409.00
400.50
405.31
29
413.50
406.00
409.58
30
413.50
399.50
408.23
31
Max
417.50
Min
398.50
Source: TD, BPC
450.00
Malbase Substation
220kV Bus Voltage (kV)
Max
Min
Ava
230.00
221.00
226.00
229.00
219.00
224.35
230.00
220.00
226.00
229.00
218.00
224.69
230.50
218.00
225.52
231.00
222.00
226.63
232.00
219.50
224.83
228.00
218.50
224.83
227.50
218.00
224.40
228.00
222.00
225.71
229.50
217.00
223.60
227.00
218.50
223.33
225.00
217.00
222.52
228.50
216.50
224.63
227.00
220.00
225.00
229.00
217.00
223.54
225.00
214.50
219.81
227.00
217.50
223.02
227.00
219.50
224.23
230.50
218.00
224.48
228.50
221.00
225.48
228.50
220.50
225.60
227.00
217.50
224.63
227.50
218.00
224.04
226.50
219.50
223.56
227.00
220.00
224.38
228.50
219.00
225.71
229.00
218.50
225.63
227.00
220.50
224.56
230.00
223.50
226.54
230.00
218.00
224.92
232.00
214.50
66kV Bus Voltage (kV)
Max
Min
Ava
67.00
64.00
65.42
67.00
64.00
65.25
67.00
64.00
65.67
66.00
63.00
64.92
67.00
63.00
65.46
66.00
64.00
65.63
67.00
63.00
64.96
66.00
64.00
65.08
66.00
62.00
64.92
66.00
64.00
65.04
66.00
63.00
64.50
66.00
63.00
64.79
66.00
63.00
64.33
66.00
62.00
64.71
66.00
64.00
64.79
66.00
56.50
64.35
65.00
62.00
63.29
66.00
62.00
64.38
66.00
63.00
65.00
66.00
63.00
64.79
66.00
64.00
65.33
66.00
64.00
65.58
66.00
63.00
65.38
66.00
63.00
65.13
66.00
63.00
64.96
66.00
64.00
65.08
67.00
63.00
65.29
67.00
64.00
65.96
66.00
64.00
65.21
67.00
65.00
66.00
67.00
64.00
65.75
67.00
56.50
Nangkhor Substation
132kV Bus Voltage (kV)
Max
Min
Ava
135.90
129.80
133.51
137.30
126.20
133.30
137.50
130.10
134.28
138.10
130.60
134.22
138.40
131.40
135.12
139.00
130.90
135.80
140.60
129.40
135.75
137.30
129.40
135.10
138.20
128.20
134.26
137.90
130.30
134.35
139.00
128.70
134.14
137.50
128.90
133.40
135.90
127.40
132.57
137.60
129.80
133.34
137.20
130.90
133.50
136.50
126.40
133.13
137.80
125.50
133.87
138.40
129.70
133.93
136.50
129.16
133.54
139.00
129.70
134.98
138.00
129.00
134.80
137.50
131.50
135.34
136.50
128.10
134.18
138.10
130.40
134.23
135.70
130.00
133.23
136.90
130.30
133.95
135.20
131.40
134.35
141.00
131.50
135.63
137.50
129.40
134.18
137.40
129.80
134.20
137.90
128.40
134.19
141.00
125.50
Bus Voltage at Malbase and Nangkhor Substation
400.00
350.00
400kV (Max)
400kV (Min)
Voltage (kV)
300.00
400kV (Ava)
220kV (Max)
220kV (Min)
250.00
220kV (Ava)
66kV (Max)
66kV (Min)
200.00
66kV (Ava)
132kV (Max)
150.00
132kV (Min)
132kV (Ava)
100.00
50.00
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Date
Page 35 of 44
Annexure- VI
January, 2015
132/33/11kV, Kilikhar substation
Sl. No
1
Date of
Tripping
5-Jan-15
Date of
Time of
Load before
Time of
Duration of
Normalizatio Fault cleared
Outage
Outage (Hrs)
Outages (Hrs)
n
(Hrs)
(MW)
7:21
5-Jan-15
7:30
0:09
Name of Feeders
Tripped
2.32
132kV Kurichu- Kilikhar
Line
5.32
132kV Kurichu- Kilikhar
Line
Name of
Substations/Line
affected by fault
Reason of Fault
Grid failed
All Outgoing feeders
2
14-Jan-15
14:45
14-Jan-15
16:45
2:00
Relay indication and
operation
Exact location of fault
(Line
segment/substation)
Remarks
Kurichu Power House
Tripped from Kurichu
end due to distance relay
operation.
Kurichu Power House
Shutdown from Kurichhu
power house. (KHPC)
Remarks
Nil
Shutdown
132/33/11kV, Nangkhor substation
Date of
Time of
Load before
Time of
Duration of
Normalizatio Fault cleared
Outage
Outage (Hrs)
Outages (Hrs)
n
(Hrs)
(MW)
Sl. No
Date of
Tripping
1
3-Jan-15
6:55
3-Jan-15
6:58
0:03
0.77
132/33kV TransformerII
2
20-Jan-15
17:05
20-Jan-15
7:25
21:28
0.78
132/33kV TransformerII
3
4
5
6
26-Jan-15
27-Jan-15
28-Jan-15
29-Jan-15
8:28
8:03
8:14
8:07
26-Jan-15
27-Jan-15
28-Jan-15
29-Jan-15
17:08
16:26
16:30
15:55
8:40
8:23
8:16
0.325
-10.6
Name of Feeders
Tripped
132kV NangkhorNganglam Line
Name of
Substations/Line
affected by fault
Reason of Fault
Relay indication and
operation
Exact location of fault
(Line
segment/substation)
-
Non directional IDMT
O/C-50A,50C & trip
relay 86 operated.
Nangkor Substation
-
Non directional IDMT
O/C-50C & trip relay 86
operated.
Nangkor Substation
Test charged at 17:09hrs
but didn’t stand with the
same fault, thereby load
transferred to X-mer-I at
17:10hrs
132kV NangkhorNganglam line
Planned shutdown taken
for annual maintenance.
Feeder charged after
getting clearance from
TLMG-II, Nganglam and
informed before to
NLDC.
-
132kV NangkhorNganglam line
Planned shutdown taken
for annual maintenance.
Feeder charged after
getting clearance from
TLMG-II, Nganglam and
informed before to
NLDC.
-
132kV NangkhorNganglam line
Planned shutdown taken
for annual maintenance.
Feeder charged after
getting clearance from
TLMG-II, Nganglam and
informed before to
NLDC.
All 33kV & 11kV
Feeders
132kV NangkhorNganglam line
Stringing of new
conductor between PN#
80 to PN# 81 for Rphase
-
-8
132kV NangkhorNganglam Line
132kV NangkhorNganglam line
Stringing of new
conductor between PN#
81 to PN# 82 for Rphase
-1.8
132kV NangkhorNganglam Line
132kV NangkhorNganglam line
Changing of Y-phase
disc insulator at PN# 81
towards PN# 82
132kV NangkhorNganglam Line
132kV NangkhorNganglam line
Changing of Y-phase
jumper at PN# 70,
Cleaning and tightening
of fittings
-
132kV NangkhorNganglam line
Planned shutdown taken
for annual maintenance.
Feeder charged after
getting clearance from
TLMG-II, Nganglam and
informed before to
NLDC.
Name of Feeders
Tripped
Name of
Substations/Line
affected by fault
Reason of Fault
Relay indication and
operation
Exact location of fault
(Line
segment/substation)
Remarks
Unknown
Test charged and found
normal.
-9.6
132/33/11kV, Deothang substation
Sl. No
Date of
Tripping
Date of
Time of
Load before
Time of
Duration of
Normalizatio Fault cleared
Outage
Outage (Hrs)
Outages (Hrs)
n
(Hrs)
(MW)
1
5-Jan-15
10:33
5-Jan-15
10:40
0:07
18.2
2
3
17-Jan-15
18-Jan-15
17:30
12:45
17-Jan-15
18-Jan-15
17:33
12:47
0:03
0:02
16.9
18.3
4
30-Jan-15
14:45
30-Jan-15
14:50
0:05
17.7
O/C (50C)
Transit fault
Transformer- II
E/F
O/C (50C)
Unknown
O/C (50C)
Bangtar
The feeder was tripped
by Bangtar feeder,
5MVA tr. Too got
tripped. Test charged and
found normal.
Name of
Substations/Line
affected by fault
Reason of Fault
Relay indication and
operation
Exact location of fault
(Line
segment/substation)
Remarks
132kV NangkorNanglam Line
Shutdown for annual
maintenance work
Nill
NA
All Out going feeders.
132/33/11kV, Nganglam substation
Sl. No
Date of
Tripping
1
29-Jan-15
Date of
Time of
Load before
Time of
Duration of
Normalizatio Fault cleared
Outage
Outage (Hrs)
Outages (Hrs)
n
(Hrs)
(MW)
8:00
29-Jan-15
20:22
12:22
3.16
Name of Feeders
Tripped
132kV DCCL feeder
Page 36 of 44
February, 2015
132/33/11kV, Kilikhar substation
Sl. No
Date of
Tripping
1
1-Feb-15
Date of
Time of
Load before
Time of
Duration of
Normalizatio Fault cleared
Outage
Name of Feeders Tripped
Outage (Hrs)
Outages(Hrs)
n
(Hrs)
(MW)
8:25
1-Feb-15
17:25
9:00
3.46
2
2-Feb-15
7:57
2-Feb-15
15:40
7:43
3.76
3
3-Feb-15
9:00
3-Feb-15
14:20
5:20
1.81
4
9-Feb-15
13:20
9-Feb-15
14:06
0:46
3.31
5
22-Feb-15
13:08
22-Feb-15
13:30
0:22
3.2
Name of
Substations/Line
affected by fault
Reason of Fault
132kV Kurichu-Kilikhar
Line
All Outgoing feeders
132kV Kilikhar-Kanglung
Line
Only 132kV KilikharKanglung feeder
132kV Kurichu-Kilikhar
Line
All Outgoing feeders
Tripped
Name of
Substations/Line
affected by fault
Reason of Fault
Relay indication and
operation
Exact location of fault
(Line
segment/substation)
Remarks
Kurichu Power House
Shutdown from Kurichhu
power house. (KHPC) for
annual maintenance.
Kanglung feeder
Shutdown taken by Jigme
Singye sir, TMD,
Gyelposhing, from station
for Kilikhar to Kanglung
line maintenance
Kurichu Power House
Grid fail from Kurichhu
end.
Exact location of fault
(Line
segment/substation)
Remarks
Shutdown
Nil
132/33/11kV, Nangkhor substation
Sl. No
1
Date of
Tripping
1-Feb-15
Date of
Time of
Duration of
Time of
Normalizatio Fault cleared
Outages
Outage (Hrs)
n
(Hrs)
(Hrs)
8:33
1-Feb-15
16:16
7:43
Load before
Outage
Name of Feeders Tripped
(MW)
-24.7
132 KV Kurichu -Nangkor
Line
Relay indication and
operation
Cleaning of strain disc
insulators & tightening of
hardware fittings from
KP # 75 to KP # 75
132 KV KurichuNangkor Line
Cleaning of strain disc
insulators & tightening of
hardware fittings from
KP # 11 to KP # 98
132 KV KurichuNangkor Line
Kurichu Power House
Planned shutdown taken for
annual maintenance. Feeder
charged after getting
clearance from Manager ,
TMD, Nangkor and from
KPH informed before to
NLDC
Planned shutdown taken for
annual maintenance. Feeder
charged after getting
clearance from Manager ,
TMD, Nangkor and from
KPH informed before to
NLDC
Planned shutdown taken for
annual maintenance. Feeder
charged after getting
clearance from Manager ,
TMD, Nangkor and from
Substation incharge
Deothang, informed before
to NLDC
2
2-Feb-15
8:13
2-Feb-15
15:24
7:11
-54
3
5-Feb-15
8:15
5-Feb-15
15:30
7:15
9.3
132 KV Nangkor Deothang Line
132 KV Nangkor Deothang Line
Cleaning of strain disc
insulators & tightening of
hardware fittings from
ND # 47 to ND # 61
132 KV Nangkor Deothang Line
4
9-Feb-15
13:45
9-Feb-15
14:02
0:17
-11.2
132 KV Kurichu -Nangkor
Line
132 KV Kurichu Nangkor Line
To reset their Generation
will by openning from
our
Kurichu Power House
Emergency shutdown taken
by Kurichu Power house
and informed to NLDC
6
22-Feb-15
13:05
22-Feb-15
13:27
0:22
-4.9
Grid Line
All Feeders
_
Non directional E/F - 51
N & trippimg relay 86
are being operated at
Tintibi Substation
Tintibi Substation
Main grid failled from
Tintibi Substation and
restored from Rangia Grid
7
22-Feb-15
13:25
22-Feb-15
16:44
3:19
-4.9
132 KV Nangkor Nganglam Line
132 KV Nangkor Nganglam Line
To restore main grid via
Rangia
_
Tintibi Substation
Salakata grid restored at
13:36 hrs and synchronised
with Kurichu at 16:44 hrs
asper NLDC.
Name of
Substations/Line
affected by fault
Reason of Fault
Relay indication and
operation
Exact location of fault
(Line
segment/substation)
Remarks
132/33/11kV, Deothang substation
Sl. No
5
Date of
Tripping
26-Feb-15
Date of
Time of
Time of
Duration of
Normalizatio Fault cleared
Outage (Hrs)
Outages
n
(Hrs)
1:50
26-Feb-15
2:16
0:26
Load before
Outage
Name of Feeders Tripped
(MW)
all feeders
Due to S/Jongkhar &
Bangtar feeder the
5MVA tr.was tripped.
Earth Fault
Borbela area
The 5MVA tr. Was tripped
by S/Jongkhar and Bangtar
feeder, test charged the S/J
feeder but again the tr. Got
tripped and pressure also
got low. The line was
normalised after buiding
pressure & the S/Jongkhar
feeder was kept isolated .
Load before
Outage
Name of Feeders Tripped
(MW)
Name of
Substations/Line
affected by fault
Reason of Fault
Relay indication and
operation
Exact location of fault
(Line
segment/substation)
Remarks
132kV Tingtibi-Nanglam
Line
132kV Tingtibi-Jigmeling
Line
132kV Tingtibi Nganglam Line
132kV Tingtibi Jigmeling Line
Earth Fault
1.11
5 MVA transformer
132/33/11kV, Tingtibi substation
Sl. No
Date of
Tripping
Date of
Time of
Time of
Duration of
Normalizatio Fault cleared
Outage (Hrs)
Outages
n
(Hrs)
1
22-Feb-15
13:09
22-Feb-15
13:36
0:27
18.86
2
23-Feb-15
18:30
23-Feb-15
18:31
0:01
14.07
Page 37 of 44
50N/51N
Nanglam Line
51N
Jigmeling Line
March, 2015
132/33/11kV, Deothang substation
Sl. No
Date of
Tripping
1
5-Mar-15
2
3
Date of
Time of
Load before
Time of
Duration of
Normalizatio Fault cleared
Outage
Outage (Hrs)
Outages (Hrs)
n
(Hrs)
(MW)
17:35
5-Mar-15
17:37
0:02
Name of Feeders
Tripped
Name of
Substations/Line
affected by fault
Reason of Fault
Relay indication and
operation
Exact location of fault
(Line
segment/substation)
Remarks
Due to the fault on
Bangter feeder.
Over Current
Unknown
The line was tested
charged and found
normal.
Due to pole collaps on SJ
feeder
Earth Fault
Sunday Market Deothang
The line was normalised
after isolating the
Samdrup Jongkhar feeder.
Reason of Fault
Relay indication and
operation
Exact location of fault
(Line
segment/substation)
Remarks
Grid failed from
Nangkhor due to Over
Current
Nangkhor Substation
Grid failed from
Nangkhor due to O/C
Supply faild due to low
pressure.
Kilikhar end.
Supply faild due to low
pressure.
1.38
10-Mar-15
11:10
10-Mar-15
11:13
0:03
1.32
31-Mar-15
8:30
31-Mar-15
8:35
0:05
1.48
5MVA Transformer-II
All Out going feeders
132/33/11kV, Kilikhar substation
Date of
Time of
Load before
Time of
Duration of
Normalizatio Fault cleared
Outage
Outage (Hrs)
Outages (Hrs)
n
(Hrs)
(MW)
Sl. No
Date of
Tripping
1
13-Mar-15
14:48
13-Mar-15
15:00
0:12
2.47
2
18-Mar-15
12:40
18-Mar-15
14:20
1:40
3.01
Name of Feeders
Tripped
132kV Kurichu- Kilikhar
Line
3
23-Mar-15
16:48
23-Mar-15
4
27-Mar-15
4:04
27-Mar-15
5
27-Mar-15
13:26
27-Mar-15
17:35
0:47
2.89
5:45
1:40
2.3
13:57
0:31
2.32
Name of
Substations/Line
affected by fault
All Outgoing feeders
Nil
Supply faild from
Kurichu end due to
distance relay operation
Supply faild from
Kurichu end due to
dist.relay opt.
Kurichu end
Tripped from Kurichu
due to backup relay
86B4. at kurichu end.
Supply faild from
Kurichu end due to
dist.relay opt.
Tripped from Kurichu
due to backup relay 86B4.
at kurichu end.
132/33/11kV, Nangkhor substation
Sl. No
Date of
Tripping
2
5-Mar-15
3
Date of
Time of
Time of
Duration of
Normalizatio Fault cleared
Outage (Hrs)
Outages
n
(Hrs)
18:07
24-Mar-15
16:53
5-Mar-15
24-Mar-15
18:09
16:55
0:02
0:02
Load before
Outage
(MW)
Name of Feeders
Tripped
Name of
Substations/Line
affected by fault
132kV transformer-II
All 33kV & 11kV
feeders
0.8
0.66
Reason of Fault
Relay indication and
operation
Due to fault on Wamrong Non-directional OC 50A
feeder
& tripping relay 86
Due to heavy rainfall and Non-directional OC 50A,
lightning
50C & tripping relay 86
Exact location of fault
(Line
segment/substation)
Remarks
33kV Wamrong line
Clear weather
Nangkhor substation
Heavy rainfall and
lightning
Exact location of fault
(Line
segment/substation)
Remarks
132/33/11kV, Tingtibi substation
Sl. No
1
Date of
Tripping
Date of
Time of
Time of
Duration of
Normalizatio Fault cleared
Outage (Hrs)
Outages
n
(Hrs)
30-Mar-15
21:15
31-Mar-15
7:08
9:53
Load before
Outage
(MW)
9.16
Name of Feeders
Tripped
132kV JigmelingTingtibi Line
Name of
Substations/Line
affected by fault
132kV JigmelingTingtibi feeder
Reason of Fault
Relay indication and
operation
Distance
The line was charged till
Relay:Location=78.29K
Jigmeling end and at
m,Zone=1,Fault
Jigmeling end the breaker
Distance relay operated R=36.56MΩ.Ia=815.6A Jigmeling Tingtibi Line couldnot be closed since
ib=820.8A,Ic=847.18A,
the line couldn't be
VAN=5.543KV.VBN=8.
synchronised with the line
540KV,VCN=4.887Kv
from Gelephu.
132/66/11kV, Gelephu substation
Date of
Time of
Time of
Duration of
Normalizatio Fault cleared
Outage (Hrs)
Outages
n
(Hrs)
Load before
Outage
(MW)
Sl. No
Date of
Tripping
1
1-Mar-15
8:52
1-Mar-15
12:00
3:07
-24.66
2
18-Mar-15
0:00
18-Mar-15
10:48
10:48
-19.87
4
19-Mar-15
0:14
19-Mar-15
0:57
0:43
-25.26
6
27-Mar-15
2:52
27-Mar-15
7:55
0.21
Name of Feeders
Tripped
Name of
Substations/Line
affected by fault
Reason of Fault
Relay indication and
operation
Exact location of fault
(Line
segment/substation)
annual maintenance of
Salakati Substation.
132kV Gelephu-Salakati
Replacement of 3nos of
Line
CT of 600/1A in 132kV
Salakati
feeder.(upgradation)
132kV Gelephu-Salakati
Line
Gelephu substation
Rangia line was extended
till Gelephu substation.
Rangia line was extended
till Gelephu substation.
changing of conductor
for B-phase & wave trap
drop conductor for Main
bus. (annual
maintenance).
Rangia line was extended
till Jigmeling substation.
Relay opperated at
Gelephu end.
General
trip R & B-phase,zone
I,dist 34.16km towards
Salakati,relay 670 & 86
master trip.
132kV Gelephu-Salakati
Line
-22.36
Remarks
at the same time Gelephu Jigmeling feeder also
tripped with only BRC
alarm indication.
66/33kV, Tsirang substation
Sl. No
2
Date of
Tripping
31-Mar-15
Date of
Time of
Load before
Time of
Duration of
Normalizatio Fault cleared
Outage
Outage (Hrs)
Outages( Hrs)
n
(Hrs)
(MW)
6:45
31-Mar-15
14:25
7:40
Name of Feeders
Tripped
220kV Dhajay
Substation
Name of
Substations/Line
affected by fault
Distance relay indicates,
the generation tripped
(only)
Page 38 of 44
Reason of Fault
Muster tripped relay
operated
Relay indication and
operation
Exact location of fault
(Line
segment/substation)
220kV Dagachhu feeder
breaker opened at
Dhajay substation end
indicating the generation
tripped alarm on
Dis.Prot. Relay Main
220kv Dagachhu breaker 2(21.2) REL670. The
opened at Dhajay
relay SIPROTEC
substation.
6MD66 indicates that
TC1, TC2 Faulty and
No. Ckt. transfer alarm.
It's found breaker
discripancy on BPHASE with partial
burnt on closing coil.
Remarks
Annexure- VII
January, 2015
400/220/66/11kV Malbase substation
Sl. No
Date of
Tripping
Time of
Outage
7-Jan-15
14:34
Date of
Load before
Time of
Duration of
Normalizatio
Outage
Fault cleared Outages (Hrs)
n
(MW)
7-Jan-15
17:56
3:22
1
Name of
Feeders/Equipment
Tripped
400kV Tala-Malbase
feeder III
-130
Name of
Substations/Line
affected by fault
400kV Tala-Malbase
feeder III
220kV Chukha-Malbase 220kV Chukha-Malbase
feeder III
feeder III
Reason of Fault
Relay indication and
operation
Shutdown
Nil
Earth fault
Main I protection trip,
General trip, Zone I trip
Exact location of fault
(Line
segment/substation)
2
8-Jan-15
17:48
8-Jan-15
18:11
0:23
21
3
8-Jan-15
17:48
8-Jan-15
18:12
0:24
-
4
8-Jan-15
17:48
8-Jan-15
18:20
0:32
28
5
8-Jan-15
17:48
8-Jan-15
18:18
0:30
24
66kV Pasakkha feeder II 66kV Pasakkha feeder II
No data display
-
6
9-Jan-15
11:49
9-Jan-15
11:56
0:07
24
66kV Pasakkha feeder II 66kV Pasakkha feeder II
No data display
-
7
9-Jan-15
11:49
9-Jan-15
11:58
0:09
25
66kV Pasakkha feeder
IV
66kV Pasakkha feeder
IV
Earth fault
IEF 50N trip, 86 trip
-
8
9-Jan-15
11:49
9-Jan-15
11:54
0:05
-
66kV Bus Coupler
-
Earth fault & Over
current
IEF-50N trip,
IOC-50N trip,
-
Shutdown taken by
maintenance team for
carrying out annual
energy meter testing at
both end and genaral
maintenance of
equipmemnts
220kV Bus Coupler
66kV Pasakkha feeder
IV
66kV Pasakkha feeder
IV
L1-N distance : 7.8km
Earth fault
Earth fault
Remarks
Shutdown taken from
Tala end for carrying out
annual energy meter
testing.
IEF 50N trip, 86 trip
Tripped due to the
snapping (breaking) of
Jumper of 35 MVA
transformer at 220kV
Singhigaon substation.
Charging of feeder was
delayed due to LA blast
of Y-phase of same
feeder while charging
breaker from singhigaon
end after the completion
of work.
9
14-Jan-15
9:27
17-Jan-15
15:50
78:23:00
26
220kV MalbaseSinghigaon feeder I
220kV MalbaseSinghigaon feeder I
10
14-Jan-15
15:51
14-Jan-15
15:58
0:07
29
220/66kV (50/63MVA)
Transformer I
220/66kV (50/63MVA)
Transformer I
diff trip, General trip, 86
trip
-
11
14-Jan-15
15:51
14-Jan-15
15:59
0:08
220/66kV (50/63MVA)
Transformer III
220/66kV (50/63MVA)
Transformer III
diff trip, General trip,
OLTC BUCH trip, 86
trip
-
12
14-Jan-15
15:51
14-Jan-15
16:10
0:19 -
220kV Bus Coupler
-
13
15-Jan-15
10:32
15-Jan-15
15:45
5:13
5
14
20-Jan-15
10:06
20-Jan-15
16:13
6:07
27
220kV MalbaseSinghigaon feeder II
Date of
Load before
Time of
Duration of
Normalizatio
Outage
Fault cleared Outages (Hrs)
n
(MW)
Name of
Feeders/Equipment
Tripped
Earth fault
Tripped while test
charging the 220kV
Malbase-Singhigaon
feeder I at15:58hrs dt
14/1/2015
-
Shutdown
Shutdown taken by TMD
P/Ling for replacement
of damage conductor
between location no.
TPS-71 & 72
220kV MalbaseSinghigaon feeder II
Shutdown
Shutdown taken by
maintenance team for
carrying out energy
meter testing vide work
permit MSS/540 dt
19/1/2014
Name of
Substations/Line
affected by fault
Reason of Fault
400kV Malbase-Siliguri 400kV Malbase-Siliguri
feeder III
feeder III
220/66/11kV Singhigaon substation
Date of
Tripping
Sl. No
1
2
Time of
Outage
14-Jan-15
16:00
24-Jan-15
10:00
14-Jan-15
24-Jan-15
16:40
220KV Incomer II and
42 50MVA and 35MVA
Transformer
0:40
16:10
6:10 33 and 21
50 and 35 MVA
Transformer
All 66KV and 11KV
outgoing
All 66KV and 11KV
outgoing
Relay indication and
operation
Exact location of fault
(Line
segment/substation)
Remarks
Puncture of R-phase LA
51 nad 86 0n B phase
at Malbase end.
Tripped while charging
220 kV incomer I due to
Y phase LA blast at
Malbase Substation.
Shutdown
Taken shutdown vide
shutdown approval
no.10A/BPC/TW/SCO/V
ol-1/15/28 dated
23.1.2015 and work
permit No.03 dated
24.01.2015 for
replacement of conductor
on 66 kV Bus.
Nil
Substation
66/33/11kV Gedu substation
Sl. No
1
2
Date of
Tripping
Time of
Outage
26-Jan-15
14:02
27-Jan-15
13:02
Date of
Time of
Normalizatio
Fault cleared
n
26-Jan-15
14:15
27-Jan-15
Duration of
Outages
0:13
13:30
0:28
Load before
Outage
(MW)
0.74
Name of
Feeders/Equipment
Tripped
8MVA Transformer I
0.98 5MVA Transformer II
Name of
Substations/Line
affected by fault
33KV G/dara fdr. I
Reason of Fault
Relay indication and
operation
Tripped due to
temporary O/C.
Not affected.
1. O/C relay.
Nill
Exact location of fault
(Line
segment/substation)
S/s
Remarks
Shut down issued to Mr.
Sonam, Engineer, SMD
p/ling for carrying out oil
top up and tightning of
nuts and bolts with work
permit no. 07.
S/s
66/33/11kV Gomtu substation
Sl. No
1
Date of
Tripping
15-Jan-15
Time of
Outage
15:47
Date of
Time of
Normalizatio
Fault cleared
n
15.01.2015
0:00
Duration of
Outages
8:13
Load before
Outage
(MW)
12.62
Name of
Feeders/Equipment
Tripped
66kV P/Ling-Gomtu
Line
Name of
Substations/Line
affected by fault
Whole Gomtu and
Samtse
Page 39 of 44
Reason of Fault
Over Current
Relay indication and
operation
No relay operation and
indication at Gomtu
Exact location of fault
(Line
segment/substation)
Remarks
P/ing Substation
Supply failed from Pling
substation due to R phase
LA blast at Malbase
Substation.
66/33/11kV Lobeysa substation
Sl. No
Date of
Tripping
Time of
Outage
Date of
Time of
Normalizatio
Fault cleared
n
Duration of
Outages
Load before
Outage
(MW)
1
12-Jan-15
8:06
12-Jan-15
16:30
8:24
7.26
2
13-Jan-15
8:12
13-Jan-15
16:10
7:58
7.16
3
14-Jan-15
9:00
14-Jan-15
16:10
7:10
7.66
4
26-Jan-15
8:46
26-Jan-15
19:15
10:29
0.33
5
27-Jan-15
8:55
27-Jan-15
18:02
9:07
0.44
6
28-Jan-15
9:19
28-Jan-15
17:48
8:29
0.16
Duration of
Outages
Load before
Outage
(MW)
73:20:00 AM
-3.25
Name of
Feeders/Equipment
Tripped
Name of
Substations/Line
affected by fault
Reason of Fault
Relay indication and
operation
Exact location of fault
(Line
segment/substation)
Remarks
NA
Shutdown
Nill
Nill
Supply feeded from
220kV Semtokha ss
Supply feeded from
220kV Semtokha ss(No
interruption)
Supply feeded from
220kV Semtokha ss
Supply feeded from
220kV Semtokha ss(No
interruption)
Supply feeded from
220kV Semtokha ss(No
interruption)
Supply feeded from
220kV Semtokha ss(No
interruption)
Name of
Feeders/Equipment
Tripped
Name of
Substations/Line
affected by fault
Reason of Fault
Relay indication and
operation
Exact location of fault
(Line
segment/substation)
Remarks
Nil
Shutdown taken by
Manager, TMD, Olakha
for annual line
maintenance work.
Reason of Fault
Relay indication and
operation
Exact location of fault
(Line
segment/substation)
Remarks
66kV LSAGewathang(PHPA)
66kV LSA to 220kV
Semtokha
220/66/11kV Semtokha substation
Sl. No
Date of
Tripping
Time of
Outage
1
18-Jan-15
8:20
Date of
Time of
Normalizatio
Fault cleared
n
21-Jan-15
9:45
2
3
4
26-Jan-15
27-Jan-15
28-Jan-15
8:45
8:54
9:20
26-Jan-15
27-Jan-15
28-Jan-15
19:15
18:01
17:49
10:30
9:07
8:29
0.08
0.22
0.3
5
26-Jan-15
16:30
26-Jan-15
19:07
2:37
5.68
11kV O/G-II, III, IV &
V feeders
Shutdown taken by
Manager, SMD,
Semtokha to connect the
LV cable after reparing
the burn one.
Duration of
Outages
Load before
Outage
(MW)
Name of
Feeders/Equipment
Tripped
Name of
Substations/Line
affected by fault
66/33kV Olakha substation
Sl. No
1
Date of
Tripping
25-Jan-15
Time of
Outage
17:39
Date of
Time of
Normalizatio
Fault cleared
n
25-Jan-15
17:42
0:03
6.1 MW
20 MVA,Trf. I
Olakha Sub.Stn.
Page 40 of 44
Due to tripping of 33kv
Chubachu Fdr.IV, Line 1.Trf.Diff.Protn.Relay 87
Optd.
was short circuit done
by bird.
T/phu. Y H S, Area.
February, 2015
400/220/66/11kV Malbase substation
Date of
Tripping
Sl. No
Time of
Outage
Date of
Time of
Duration of
Load before
Normalizatio
Fault cleared Outages (Hrs) Outage (MW)
n
Name of
Feeders/Equipment
Tripped
Name of
Substations/Line
affected by fault
Reason of Fault
Relay indication and
operation
Exact location of fault
(Line
segment/substation)
Remarks
-
Shutdown taken by
maintenance team to
carry out annual testing
of energy meter
1
3-Feb-15
9:49
3-Feb-15
10:45
0:56
12
66kV MalbasePhuenstholing Line
66kV MalbasePhuenstholing feeder
Shutdown
2
4-Feb-15
10:43
4-Feb-15
11:48
1:05
12
66kV MalbasePhuenstholing Line
66kV MalbasePhuenstholing feeder
Shutdown
3
9-Feb-15
6:46
11-Feb-15
13:50
7:04
-7
220kV Malbase-Bripara 220kV Malbase-Bripara
feeder III
feeder III
4
13-Feb-15
9:05
13-Feb-15
17:25
8:20
0
66kV MalbasePhuenstholing feeder
66kV MalbasePhuenstholing feeder
5
14-Feb-15
8:40
14-Feb-15
18:28
9:48
12
66kV MalbasePhuenstholing feeder
66kV MalbasePhuenstholing feeder
6
16-Feb-15
8:23
16-Feb-15
17:04
8:41
-15
220kV Malbase-Bripara 220kV Malbase-Bripara
Shutdown
feeder III
feeder III
-
Shutdown taken by TMD
P/ling to carryout line
patroling & line
maintenance
7
16-Feb-15
9:30
16-Feb-15
11:08
1:38
0.2
66/11kV(20MVA)
Transformer-I
66/11kV(20MVA)
Transformer-I
Shutdown
-
Shutdown taken by
maintenance team to
carry out annual testing
of energy meter
8
16-Feb-15
15:20
16-Feb-15
15:58
0:38
25
220kV MalbaseSinghigaon feeder I
220kV MalbaseSinghigaon feeder I
Shutdown
Shutdown taken by
maintenance team for
replacement of new
energy meter
Main meter )
Shutdown taken by
maintenance team to
carry out annual testing
of energy meter
Shutdown
-
Shutdown taken by TMD
P/ling to carryout line
pratoling & line
maintenance.
-
17-Feb-15
9:20
17-Feb-15
15:07
5:47
0.4
66/11kV (20 MVA)
Transformer II
66/11kV (20 MVA)
Transformer II
Shutdown
-
10
18-Feb-15
9:49
18-Feb-15
13:07
3:18
24
220kV MalbaseSinghigaon feeder I
220kV MalbaseSinghigaon feeder I
Shutdown
-
11
26-Feb-15
8:45
26-Feb-15
17:23
8:38
-19
220kV Chukha-Malbase 220kV Chukha-Malbase
Shutdown
feeder III
feeder III
-
12
27-Feb-15
8:28
27-Feb-15
18:32
10:04
-21
13
28-Feb-15
8:25
28-Feb-15
18:14
9:49
-24
220kV Chukha-Malbase
feeder III
220kV Chukha-Malbase
feeder III
Name of
Feeders/Equipment
Tripped
Name of
Substations/Line
affected by fault
There was no load
display at 9:00hrs at our
end since the feeder
breaker was open at
8:57hrs at P/ling end.
-
9
220kV Chukha-Malbase
feeder III
220kV Chukha-Malbase
feeder III
Shutdown taken by
maintenance team to
carry out annual testing
of energy meter at P/Ling
end
Shutdown taken for all
Chukha generating units
to carry out reservoir
scouring.
(
Shutdown taken by TMD
P/ling to carryout line
pratoling & line
maintenance
Shutdown taken by
TMD Tshemalakha for
line inspection and
energy meter testing at
chukha end from
26.02.2015 to
03.03.2015 in daily
returnable bases
66/33/11kV Gedu substation
Date of
Tripping
Sl. No
1
8-Feb-15
Time of
Outage
Date of
Time of
Duration of
Load before
Normalizatio
Fault cleared Outages (Hrs) Outage (MW)
n
8:27
8-Feb-15
16:40
8:13
Not affacted
Relay indication and
operation
Shutdown taken for
annual maintenance
work.
Shutdown taken for
annual maintenance
work.
Tripped
Shutdown taken for
annual maintenance
work.
Shutdown taken for
annual maintenance
work.
1.O/C relay.
Exact location of fault
(Line
segment/substation)
2
9-Feb-15
9:51
10-Feb-15
20:07
10:44
3
10-Feb-15
21:13
10-Feb-15
21:16
0:03
4
11-Feb-15
8:55
11-Feb-15
17:12
8:17
Not affacted
5
12-Feb-15
8:53
12-Feb-15
14:57
6:04
Not affacted
6
12-Feb-15
10:15
12-Feb-15
11:30
1:15
Idle charge.
8MVA Transformer I
Not affacted
Shutdown
7
8
22-Feb-15
23-Feb-15
11:45
18:51
22-Feb-15
23-Feb-15
11:47
18:55
0:02
0:04
0.39
1.04
8MVA Transformer I
8MVA Transformer I
33kV Gurungdara fdr. I
33kV Gurungdara fdr. I
Tripped
Tripped
8MVA Transformer I
Not affected since the
line was feeded from
33kV Gurungdara II.
Shutdown
Name of
Substations/Line
affected by fault
Reason of Fault
Relay indication and
operation
Exact location of fault
(Line
segment/substation)
NA
Shutdown
Nill
Nill
NA
Shutdown
Nill
Nill
9
24-Feb-15
9:30
24-Feb-15
11:20
1:50
Not affacted
Reason of Fault
0.69
Idle charge.
66kV Chukha-P/ling
Line
33kV Gurungdara fdr. I
Remarks
Shutdown issued to Mr.
Sonam Engineer, SMD
P/ling for PT meggering
and cleaning of the
pannel with work permit
no. 08
1.O/C relay.
1.O/C relay.
Shutdown taken by Mr.
Tashi Tshering,
Incharge, Gedu
Substation for cleaning
of the pannel with work
permit no. 09.
66/33/11kV Lobeysa substation
Date of
Time of
Duration of
Load before
Normalizatio
Fault cleared Outages (Hrs) Outage (MW)
n
Name of
Feeders/Equipment
Tripped
Date of
Tripping
Time of
Outage
1
3-Feb-15
9:01
3-Feb-15
16:38
7:37
1.6
2
4-Feb-15
9:15
4-Feb-15
16:05
6:50
2
3
5-Feb-15
9:02
5-Feb-15
17:00
7:58
2
5MVA Transformer-II
NA
Shutdown
Nill
Nill
4
6-Feb-15
9:05
6-Feb-15
15:20
6:15
2.2
5MVA Transformer-II
NA
Shutdown
Nill
Nill
Name of
Feeders/Equipment
Tripped
Name of
Substations/Line
affected by fault
Reason of Fault
Relay indication and
operation
Exact location of fault
(Line
segment/substation)
Sl. No
5MVA Transformer-I
Remarks
Supply feeded from
5MVA-II (No
interruption)
Supply feeded from
5MVA-I(No
interruption)
66/33kV Watsa substation
Date of
Time of
Duration of
Load before
Normalizatio
Fault cleared Outages (Hrs) Outage (MW)
n
Date of
Tripping
Time of
Outage
1
3-Feb-15
11:35
3-Feb-15
11:45
0:10
.278MW
66KV SF6 breaker
Fdr. I, II and station
Earth Fault
2
26-Feb-15
16:42
26-Feb-15
16:46
0:04
.511MW
66KV SF6 breaker
Fdr. I, II and station
Earth Fault
Sl. No
Page 41 of 44
Earth Fault relay
operated
Earth Fault relay
operated
Fdr. I Jongzhi
Fdr. I Wanakha line
Remarks
March, 2015
66/33/11kV Phuentsholing substation
Sl. No
Date of
Tripping
Date of
Time of
Load before
Time of
Duration of
Normalizatio Fault cleared
Outage
Outage (Hrs)
Outages (Hrs)
n
(Hrs)
(MW)
Name of Feeders
Tripped
Name of
Substations/Line
affected by fault
Reason of Fault
Relay indication and
operation
Exact location of fault
(Line
segment/substation)
Remarks
P/ing-Gomtu Line
Shutdown taken by TMD
Pling for inspection of
flash over/ broken disc
Insulators and replacing
if any and annual
mainteance of line.
1
29-Mar-15
8:57
29-Mar-15
17:40
8:43
5.02
66kV Incomer
66kV incomer
Shutdown
Nil
2
30-Mar-15
19:55
30-Mar-15
20:36
0:41
8.23
66kV Incomer
66kV Incomer
Supply failed from Pling
Substation due to
temporary fault.
Nil
3
30-Mar-15
21:25
30-Mar-15
21:30
0:05
0.72
66kV Incomer
66kV Incomer
Supply failed from
Chukha end due to
overloading at Pling
Substation.
No relay and indication
Operated at Gomtu
Chukha end
Name of
Feeders/Equipment
Tripped
66kV LSA-Semtokha
Line
Name of
Substations/Line
affected by fault
Reason of Fault
Relay indication and
operation
Exact location of fault
(Line
segment/substation)
Remarks
all outgoing feeders
tirp on fault
REL 511
Nill
Both the Incomer tripped
Supply failed from
Phuentsholing Substation
due to temporary fault.
Supply failed from
Chukha end due to
overloading at Pling
Substation.
66/33/11kV Lobeysa substation
Date of
Load before
Time of
Duration of
Normalizatio
Outage
Fault cleared Outages (Hrs)
n
(MW)
Sl. No
Date of
Tripping
Time of
Outage
1
12-Mar-15
14:52
12-Mar-15
14:56
0:04
2.36
2
12-Mar-15
14:52
12-Mar-15
15:23
0:31
0.44
66kV BHP-LSA line
all outgoing feeders
tirp on fault
REL 511
Nill
Both the Incomer tripped
3
26-Mar-15
15:39
26-Mar-15
15:40
0:01
0.08
66kV LSA-Semtokha
Line
all outgoing feeders
tirp on fault
REL 511
Nill
Both the Incomer tripped
4
26-Mar-15
15:39
26-Mar-15
15:41
0:02
3.31
66kV BHP-LSA line
all outgoing feeders
tirp on fault
REL 511
Nill
Both the Incomer tripped
all outgoing feeders
Gerenation fail at
Chhukha
Nill
Chhukha power house
66kV Incomer tripped at
20:13hrs , due to
generation fail at Chhuka
end
5
30-Mar-15
20:13
30-Mar-15
20:44
0:31
1.44
66kV LSA-Semtokha
Line
6
30-Mar-15
20:13
30-Mar-15
20:49
0:36
3.31
66kV BHP-LSA line
all outgoing feeders
Gerenation fail at
Chhukha
Nill
Chhukha power house
66kV Incomer tripped
Name of
Feeders/Equipment
Tripped
Name of
Substations/Line
affected by fault
Reason of Fault
Relay indication and
operation
Exact location of fault
(Line
segment/substation)
Remarks
220/66/11kV Semtokha substation
Date of
Load before
Time of
Duration of
Normalizatio
Outage
Fault cleared Outages (Hrs)
n
(MW)
Sl. No
Date of
Tripping
Time of
Outage
1
30-Mar-15
20:13
30-Mar-15
20:43
0:30
-39.81
220kV SemtokhaChukha
Whole western
2
24-Mar-15
17:50
24-Mar-15
18:14
0:24
1.888
11kV O/G-III feeder
11kV O/G-III feeder
only
Load before
Outage
(MW)
7.996
Name of
Feeders/Equipment
Tripped
I/C S/kha
Name of
Substations/Line
affected by fault
Black out
Duration of
Outages
Load before
Outage
(MW)
Name of
Feeders/Equipment
Tripped
Name of
Substations/Line
affected by fault
Supply fail from Chukha.
Due to bad weather
No tripping at Semtokha
condition at Malbesa,
chukha and phuntsholing
Chukha
Transient fault due to
heavy lighting
O/C, & E/F relay
opereted
Reason of Fault
Relay indication and
operation
_
_
Reason of Fault
Relay indication and
operation
Exact location of fault
(Line
segment/substation)
Remarks
....
....
.......
...
......
......
Line side
66/33/11kV Dechenchholing substation
Sl. No
Date of
Tripping
Time of
Outage
1
30-Mar-15
20:13
Date of
Time of
Normalizatio
Fault cleared
n
30-Mar-15
20:45
Duration of
Outages
0:32
Exact location of fault
(Line
segment/substation)
Chukha (G)
Remarks
_
66/33/11kV Jemina substation
Date of
Time of
Normalizatio
Fault cleared
n
Sl. No
Date of
Tripping
Time of
Outage
1
26-Mar-15
15:33
26-Mar-15
15:35
0:02
5.52
66KV Olakha
whole s/s & line
2
30-Mar-15
20:10
30-Mar-15
20:40
0:30
2.6
66KV chundo
whole s/s & line
Load before
Outage
(MW)
6.8MW
Name of
Feeders/Equipment
Tripped
66kV both i/c failed
Name of
Substations/Line
affected by fault
Paro s/s, Haa s/s
Load before
Outage
(MW)
Name of
Feeders/Equipment
Tripped
Name of
Substations/Line
affected by fault
Reason of Fault
Fdr. I, II and station
66KV supply fail from
chukha end
Supply failed from
source.
Supply failed from
source.
Chumdo switching station
Sl. No
Date of
Tripping
Time of
Outage
1
30-Mar-15
20:11
Date of
Time of
Normalizatio
Fault cleared
n
30-Mar-15
20:40
Duration of
Outages
0:29
Reason of Fault
Relay indication and
operation
Grid failed
Exact location of fault
(Line
segment/substation)
Chukha P/H
Remarks
66/33kV Watsa substation
Sl. No
1
Date of
Tripping
30-Mar-15
Time of
Outage
20:08
Date of
Time of
Normalizatio
Fault cleared
n
30-Mar-15
20:38
Duration of
Outages
0:30
.834MW
66KV incomer feeder
Page 42 of 44
Relay indication and
operation
Exact location of fault
(Line
segment/substation)
Remarks
February, 2015
400/220/66/11kV Malbase substation
Date of
Tripping
Sl. No
Time of
Outage
Date of
Load before
Time of
Duration of
Normalizatio
Outage
Fault cleared Outages
n
(MW)
Name of
Feeders/Equipment
Tripped
Name of
Substations/Line
affected by fault
Reason of Fault
1
3-Feb-15
9:49
3-Feb-15
10:45
0:56
12
66kV MalbasePhuenstholing feeder
66kV MalbasePhuenstholing feeder
Shutdown
2
4-Feb-15
10:43
4-Feb-15
11:48
1:05
12
66kV MalbasePhuenstholing feeder
66kV MalbasePhuenstholing feeder
Shutdown
3
9-Feb-15
6:46
11-Feb-15
13:50
7:04
-7
4
13-Feb-15
9:05
13-Feb-15
17:25
8:20
0
66kV MalbasePhuenstholing feeder
66kV MalbasePhuenstholing feeder
5
14-Feb-15
8:40
14-Feb-15
18:28
9:48
12
66kV MalbasePhuenstholing feeder
66kV MalbasePhuenstholing feeder
6
16-Feb-15
8:23
16-Feb-15
17:04
220kV Malbase-Bripara 220kV Malbase-Bripara
feeder III
feeder III
Relay indication and
operation
Shutdown
Shutdown taken by TMD
P/ling to carryout line
pratoling & line
maintenance.
16-Feb-15
9:30
16-Feb-15
11:08
1:38
0.2
66/11kV(20MVA)
Transformer-I
66/11kV(20MVA)
Transformer-I
Shutdown
8
16-Feb-15
15:20
16-Feb-15
15:58
0:38
25
220kV MalbaseSinghigaon feeder I
220kV MalbaseSinghigaon feeder I
Shutdown
-
Shutdown taken by TMD
P/ling to carryout line
patroling & line
maintenance
-
Shutdown taken by
maintenance team to
carry out annual testing
of energy meter as per
shutdown approvel no.
10A/BPC/TW/SCO/VO
L-I/15/51 dt-11.02.2015
Shutdown taken by
maintenance team for
replacement of new
energy meter
Main meter )
17-Feb-15
9:20
17-Feb-15
15:07
5:47
0.4
66/11kV (20 MVA)
Transformer II
66/11kV (20 MVA)
Transformer II
Shutdown
-
10
18-Feb-15
9:49
18-Feb-15
13:07
3:18
24
220kV MalbaseSinghigaon feeder I
220kV MalbaseSinghigaon feeder I
Shutdown
-
11
26-Feb-15
8:45
26-Feb-15
17:23
8:38
-19
220kV Chukha-Malbase 220kV Chukha-Malbase
Shutdown
feeder III
feeder III
-
12
27-Feb-15
8:28
27-Feb-15
18:32
10:04
-21
13
28-Feb-15
8:25
28-Feb-15
18:14
9:49
-24
Name of
Feeders/Equipment
Tripped
Name of
Substations/Line
affected by fault
Shutdown taken by
maintenance team to
carry out annual testing
of energy meter at P/Ling
end
Shutdown taken for all
Chukha generating units
to carry out reservoir
scouring. The feeder
breaker was hand trip
from our end to avoid
over load since power
was imported from India
while all units at Chukha
was under shutdown
condition
There was no load
display at 9:00hrs at our
end since the feeder
breaker was open at
8:57hrs at P/ling end.
-
9
220kV Chukha-Malbase
feeder III
220kV Chukha-Malbase
feeder III
-
-
7
220kV Chukha-Malbase
feeder III
220kV Chukha-Malbase
feeder III
Remarks
Shutdown taken by
maintenance team to
carry out annual testing
of energy meter as per
shutdown approvel no.
10/BPC/TW/SCO/VOLI/15/36 dt -02/2015
-
220kV Malbase-Bripara 220kV Malbase-Bripara
-15
Shutdown
feeder III
feeder III
8:41
Exact location of fault
(Line
segment/substation)
(
Shutdown taken by
maintenance team to
carry out annual testing
of energy meter as per
shutdown approvel no.
10A/BPC/TW/SCO/VO
L-I/15/51 dt-11.02.2015
Shutdown taken by TMD
P/ling to carryout line
pratoling & line
maintenance
Shutdown taken by
TMD Tshemalakha for
line inspection and
energy meter testing at
chukha end from
26.02.2015 to
03.03.2015 in daily
returnable bases
66/33/11kV Gedu substation
Date of
Tripping
Sl. No
1
8-Feb-15
Time of
Outage
Date of
Load before
Time of
Duration of
Normalizatio
Outage
Fault cleared Outages
n
(MW)
8:27
8-Feb-15
16:40
8:13
66kV Chukha-P/ling fdr.
( Gedu Chukha section)
2
9-Feb-15
9:51
10-Feb-15
20:07
10:44
3
10-Feb-15
21:13
10-Feb-15
21:16
0:03
4
11-Feb-15
8:55
11-Feb-15
17:12
8:17
5
12-Feb-15
8:53
12-Feb-15
14:57
66kV Chukha-P/ling fdr.
( Gedu Chukha section)
0.69
8MVA Transformer I
66kV Chukha-P/ling fdr.
( Gedu Chukha section)
66kV Chukha-P/ling fdr.
( Gedu Chukha section)
6:04
6
12-Feb-15
10:15
12-Feb-15
11:30
1:15 Idle charge.
7
8
22-Feb-15
23-Feb-15
11:45
18:51
22-Feb-15
23-Feb-15
11:47
18:55
0:02
0:04
9
24-Feb-15
9:30
24-Feb-15
11:20
1:50 Idle charge.
0.39 8MVA Transformer I
1.04 8MVA Transformer I
66/33/11kV Lobeysa substation
Date of
Tripping
Sl. No
1
3-Feb-15
Time of
Outage
9:01
Date of
Load before
Time of
Duration of
Normalizatio
Outage
Fault cleared Outages
n
(MW)
3-Feb-15
16:38
7:37
8MVA Transformer I
1.6
8MVA Transformer I
Reason of Fault
Shutdown taken for
Not affacted
annual maintenance
work.
Shutdown taken for
Not affacted
annual maintenance
work.
33kV Gurungdara fdr. I
Tripped
Shutdown taken for
Not affacted
annual maintenance
work.
Shutdown taken for
Not affacted
annual maintenance
work.
Not affacted
Shutdown
33kV Gurungdara fdr. I
33kV Gurungdara fdr. I
Tripped
Tripped
Not affected since the
line was feeded from
33kV Gurungdara II.
Shutdown
Page 43 ofName
44of
Name of
Feeders/Equipment
Tripped
5MVA-I (66/11kV)
Substations/Line
affected by fault
NA
Reason of Fault
Shutdown
Relay indication and
operation
Exact location of fault
(Line
segment/substation)
Remarks
1.O/C relay.
Shutdown issued to Mr.
Sonam Engineer, SMD
P/ling for PT meggering
and cleaning of the
pannel with work permit
no. 08
1.O/C relay.
1.O/C relay.
Shutdown taken by Mr.
Tashi Tshering,
Incharge, Gedu
Substation for cleaning
of the pannel with work
permit no. 09.
Relay indication and
operation
Nill
Exact location of fault
(Line
segment/substation)
Nill
Remarks
Shutdown as per the
shutdown approval
No.10A/BPC/TW/SCO/
VOL-I/15/35
dt.02/02/2015 for annual
March, 2015
66/33/11kV Phuentsholing substation
Sl. No
Date of
Tripping
Date of
Time of
Time of
Duration of
Normalizatio Fault cleared
Outage (Hrs)
Outages
n
(Hrs)
Load before
Outage
(MW)
Name of Feeders
Tripped
Name of
Substations/Line
affected by fault
Reason of Fault
Relay indication and
operation
1
29-Mar-15
8:57
29-Mar-15
17:40
8:43
5.02
66kV Incomer
66kV incomer
Shutdown
Nil
2
30-Mar-15
19:55
30-Mar-15
20:36
0:41
8.23
66kV Incomer
66kV Incomer
Supply failed from Pling
Substation due to
temporary fault.
Nil
3
30-Mar-15
21:25
30-Mar-15
21:30
0:05
0.72
66kV Incomer
66kV Incomer
Load before
Outage
(MW)
Name of
Feeders/Equipment
Tripped
Name of
Substations/Line
affected by fault
Exact location of fault
(Line
segment/substation)
Remarks
P/ing-Gomtu Line
Shutdown taken by TMD
Pling vide REF/MSG No
99 dated 19.03.2015 for
inspection of flash over/
broken disc Insulators
and replacing if any and
annual mainteance of
line.
Supply failed from
Phuentsholing Substation
due to temporary fault.
Supply failed from
Chukha end due to
No relay and indication Operated at GomtuChukha end
overloading at Pling
Substation.
Supply failed from
Chukha end due to
overloading at Pling
Substation.
66/33/11kV Lobeysa substation
Sl. No
1
Date of
Tripping
12-Mar-15
Time of
Outage
Date of
Time of
Duration of
Normalizatio
Fault cleared
Outages
n
14:52
12-Mar-15
14:56
0:04
2.36
66kV lsa to 66kV S/kha
all outgoing feeders
Reason of Fault
tirp on fault
Relay indication and
operation
REL 511
Exact location of fault
(Line
segment/substation)
Remarks
Nill
Both the Incomer tripped
at our end operating both
the breakers and conform
with shiftincharge
Semtokha and the line
was charge at 14:56hrs
as the line was till our
end at the time of
tripping.
2
12-Mar-15
14:52
12-Mar-15
15:23
0:31
0.44
66kV lsa to 66kV
Basochu
all outgoing feeders
tirp on fault
REL 511
Nill
Both the Incomer tripped
at our end operating both
the breakers and conform
with shiftincharge
Basochhu and they said
they will conform after
they are ready to charge
and only at 15:23hrs the
line was charged.
3
26-Mar-15
15:39
26-Mar-15
15:40
0:01
0.08
66kV lsa to 66kV S/kha
all outgoing feeders
tirp on fault
REL 511
Nill
Both the Incomer tripped
at our end operating both
the breakers and conform
with shiftincharge
Semtokha and the line
was charge at 15:40hrs
Nill
Both the Incomer tripped
at our end operating both
the breakers at our end
and we conform to
shiftincharge Basochu
,they said at their end our
breaker has been
operated and at 15:40hrs
the line was charged
from our end.
Chhukha power house
66kV Incomer tripped at
20:13hrs , due to
generation fail at Chhuka
end and supply resumed
at 20:44hrs from 220kV
Semtokha S/s. As per the
instruction from Incharge
220kV Semtokha,
breaker towards
Basochhu kept open at
20:17hrs.
4
5
6
26-Mar-15
30-Mar-15
30-Mar-15
15:39
26-Mar-15
20:13
30-Mar-15
20:13
30-Mar-15
15:41
20:44
20:49
0:02
0:31
0:36
3.31
1.44
66kV lsa to 66kV
Basochu
66kV lsa to 66kV S/kha
all outgoing feeders
all outgoing feeders
tirp on fault
Gerenation fail at
Chhukha
REL 511
Nill
3.31
66kV lsa to 66kV
Basochu
all outgoing feeders
Gerenation fail at
Chhukha
Nill
Chhukha power house
66kV Incomer tripped at
20:13hrs , due to
generation fail at Chhuka
end and supply resumed
at 20:44hrs from 220kV
Semtokha ss. As per the
instruction from Incharge
220kV Semtokha,
breaker towards
Basochhu kept open at
20:17hrs. At 20:49hrs
supply extended till
Kewathang SS(PHPA).
Load before
Outage
(MW)
Name of
Feeders/Equipment
Tripped
Name of
Substations/Line
affected by fault
Reason of Fault
Relay indication and
operation
Exact location of fault
(Line
segment/substation)
Remarks
220/66/11kV Semtokha substation
Date of
Time of
Duration of
Normalizatio
Fault cleared
Outages
n
Sl. No
Date of
Tripping
Time of
Outage
1
30-Mar-15
20:13
30-Mar-15
20:43
0:30
-39.81
220kV SemtokhaChukha
Whole western
2
24-Mar-15
17:50
24-Mar-15
18:14
0:24
1.888
11kV O/G-III feeder
11kV O/G-III feeder
only
Date of
Time of
Duration of
Normalizatio
Fault cleared
Outages
n
30-Mar-15
20:45
0:32
Load before
Outage
(MW)
7.996
Name of
Feeders/Equipment
Tripped
I/C S/kha
Name of
Substations/Line
affected by fault
Black out
Date of
Time of
Duration of
Normalizatio
Fault cleared
Outages
n
Load before
Outage
(MW)
Name of
Feeders/Equipment
Tripped
Name of
Substations/Line
affected by fault
Supply fail from Chukha.
Due to bad weather
No tripping at Semtokha
condition at Malbesa,
chukha and phuntsholing
Transient fault due to
heavy lighting
O/C, & E/F relay
opereted
Reason of Fault
Relay indication and
operation
_
_
Reason of Fault
Relay indication and
operation
Chukha
Line side
66/33/11kV Dechenchholing substation
Sl. No
Date of
Tripping
Time of
Outage
1
30-Mar-15
20:13
Exact location of fault
(Line
segment/substation)
Chukha (G)
Remarks
_
66/33/11kV Jemina substation
Sl. No
Date of
Tripping
Time of
Outage
1
26-Mar-15
15:33
26-Mar-15
15:35
0:02
5.52
66KV Olakha
whole s/s & line
2
30-Mar-15
20:10
30-Mar-15
20:40
0:30
2.6
66KV chundo
whole s/s & line
Page 44 of 44
Supply failed from
source.
Supply failed from
source.
Exact location of fault
(Line
segment/substation)
Remarks
....
....
.......
...
......
......