Substation company in Bangladesh

One of the basic functions of switchgear is protection, which is interruption of short-circuit and overload fault currents while maintaining service to unaffected circuits. Switchgear also provides isolation of circuits from power supplies. Switchgear is also used to enhance system availability by allowing more than one source to feed a load

This protective equipments is used for Low voltage & medium voltage system, its usually used for 11kV system, Load break switch (LBS) mechanism is available for 630A, and over current protection scheme is done through HRC fuse, The panel includes 3 Numbers of CT (Current transformer) and 3 Numbers of PT (Potential transformer) for measuring system current and voltage, The HRC fuse protect overload or any short circuit, The panel also include 3 numbers of Ampere meter & one voltmeter with selector switch for monitoring different

The Construction is of metal clad type and uses high grade steel of adequate thickness ensuring safety and security, the panel size is 900 mm x 1000 mm x 1800 mm and weight almost 450kGs

Key feature
Long Maintenance free operation
Fully metal clad design
Horizontal isolation
Very High Operating Reliability
Simple Maintenance and Inspection
High Dynamic and Thermal Strength
Special Bottle Arc-chutes
Current Interruption without visible arcs
Simple Driving Mechanism

We TNS Engineering Ltd manufacture and supply HT Load Break Switches ranges from 3.3kV to 36kV with the amp rating from 630 to 800. Our 11kV LBS switchgear panels are compact in size to suite every industrial needs. Available Indoor and Outdoor type Load break switches for varied range of applications



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

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