TRANSMISSION AND DISTRIBUTION SYSTEM PARAMETERS IN BANGLADESH

Restricted Working Period

Due to monsoon rain between July and September, work may slowdown. Due to traffic, work along /across road has to carefully plan. The Contractor shall obtain reliable Information concerning the conditions appertaining to the working areas covered by this Contract and shall plan his work in accordance with local conditions.

Transmission and Distribution System Parameters in Bangladesh

SYSTEM ELECTRICAL PARAMETERS


230 kV Transmission System
Normal Service Voltage                                        :           230     kV
Rated Voltage                                                         :           245     kV
Insulation Level -
Lightning Impulse Withstand                               :           1050  kV
50Hz dry 1 minute Withstand                             :           460     kV
Number of Phase                                                   :           3
Frequency                                                                :           50       Hz
Switchgear Symmetrical Breaking Capacity       :           40       kA, 3 sec

System Earthing
The 230/132 kV auto transformers are solidly earthed

132 kV Transmission System
Normal Service Voltage                                        :           132     kV
Rated Voltage                                                          :           145     kV
Impulse Voltage Withstand Level                        :           650     kV
Number of Phase                                                   :           3
Frequency                                                                :           50       Hz
Switchgear Symmetrical Breaking Capacity      :           31.5   kA, 3 sec
Voltage Stability Limits                                         :           ± 10%            Volts
Frequency Stability Limits                                    :           48-51 Hz

33 kV Transmission System
Normal Service Voltage                                      :           33       kV
Rated Voltage                                                       :           36       kV
Impulse Voltage Withstand Level                     :           170     kV
Number of Phase                                                 :           3
Frequency                                                             :           50       Hz
Switchgear Symmetrical Breaking Capacity   :           25       kA, 3 sec

The 33 kV system is solidly earthed at some of the 132/33 kV Grid substations and resistance earthed at some of the Grid substations.

At the Proposed 132/33 kV sub-station the 33 kV systems will be resistance earthed.

11 KV Distribution Systems
Normal Service Voltage                                        :           11 KV
Rated Voltage                                                          :           12 KV
Impulse Voltage Withstand Level                      :           75 KV
Number of Phase                                                   :           3
Frequency                                                               :           50       Hz
Switchgear Symmetrical Breaking Capacity      :           25       kA, 3 sec
System earthing                                                     :           Solid Normal

Low Voltage AC System
Normal Service Voltage                                        :           400/230 volts
Rated Voltage                                                          :           415/240 volts
Number of Phase                                                   :           3 phase 4 wire
Frequency                                                                :           50Hz
Switchgear Symmetrical Breaking Capacity   :           22kA, 3 sec
System earthing                                                     :           Solid

D.C System
For D.C. motor driven auxiliaries, tripping, indicating lamps and controls.
Normal battery voltage                :           110V nominal for new sub-stations.
Tolerance on rated voltage         :           + 10%, -15%
Voltage at various existing sites :           30V, 48V, 110V, 220V, 250V.

For Supervisory and Telecommunications

Nominal System Voltage              :          48V
Normal float charge voltage       :           53V
Tolerance on rated voltage         :           +1V, -7V


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