Substation company in Bangladesh

Application
Protection, which is the termination of short-circuiting and overload fault currents while preserving service to unaffected circuits, is one of the fundamental purposes of switch gear. Switch gear also isolates circuits from the power supply. Switchgear is also used to improve system availability by enabling many sources to supply a load at the same time.

Construction
This device is used to protect low and medium-voltage systems. It is commonly used in 11kV systems. For 630A, a load break switch (LBS) mechanism is offered, and an overcurrent protection strategy is implemented using an HRC fuse. The panel has three CT (current transformers) and three PT (potential transformers) for detecting system current and voltage. The HRC fuse protects against overload and short circuits. The panel also has three-ampere meters and one voltmeter with a selection switch.

The panel dimension is 900 mm x 1000 mm x 1800 mm and weighs about 450 kg. The construction is metal clad and employs high grade steel of suitable thickness to provide safety and security.

Key feature

  • Long-term, trouble-free operation.
  • The whole structure is made of metal.
  • Isolation on the horizontal plane
  • Extremely High Operational Reliability.
  • Inspection and maintenance are simple.
  • High thermal and dynamic strength.
  • Arc-chutes for Special Bottles
  • Currently, there are no apparent arcs in the interruption.
  • A straightforward driving mechanism.

We, Smart Power & Technologies, develop and provide HT Load Break Switches with voltage ratings ranging from 3.3kV to 36kV and amp ratings ranging from 630 to 800. Our 11kV LBS switchgear panels are small enough to fit into any industrial space. Load break switches are available in both indoor and outdoor configurations for a wide variety of uses.

 

 

Technical Specification11kV Series Load Break Switchgear Panels
Model LMAX16325 LAMX18025 LMAX26325
Rated Voltage 12 KV 12 KV 24 KV
Rated Frequency 50 Hz 50 Hz 50 Hz
Rated Current 630 A 1250 A 630 A
Rated Peak Current 62.5 KA 62.5 KA 62.5 KA
Rated Short time current / 1 sec. 26.3 KA (3 sec) 26.3 KA (3 sec) 26.3 KA (3 sec)
Rated Making Current 62.5 KA 62.5 KA 62.5 KA
Rated Breaking Current 630 A 800 A 630 A
Impulse Voltage, Wave Shape 1.2/50 MS
i) To Earth 75 KV 75 KV 125 KV
ii) Between Poles 75 KV 75 KV 125 KV
iii) Between Open Contacts 85 KV 85 KV 145 KV
Power Frequency Test Voltage
iv) To Earth 28 KV 28 KV 55 KV
v) Between Poles 28 KV 28 KV 55 KV
vi) Between Open Contacts 35 KV 35 KV 70 KV
Breaking of Capacitance Load 50 A 50 A 25 A
Closed Loop Breaking Current COS ф = 0.31 ND 630 A 800 A 630 A
Rated Transformer Off Load Breaking Capacity 120 A 120 A 120 A
Rated Line Charging Breaking Capacity 90 A 90 A 90 A
Rated Cable Charging Breaking Capacity 90 A 90 A 90 A
Dimensions (Ref. Drg. Enclosed)
i) Between Poles (Centers) mm 150-210 150-210 175-250
ii) Between Open Contacts mm 140 140 235
iii) Between live parts and earth mm 130 130 210
Making Time 35 M. Sec
Arc Duration 5-20 M. Sec