ABB_ LBS_ Sectos NXB & NXBD SF6 gas insulated pole mounted load-break switch-disconnector

The NXB is a SF( -insulated pole mounted switch disconnector suitable for both conventional overhead lines and BLX type lines with insulated conductors and specifically designed for use in modern tele-controlled distribution automation systems. The NXB offers reliable maintenance free operation even in the most demanding climatic conditions including salt laden atmospheres, corrosive industrial pollution, snow and ice. The three phase switch unit is mounted inside a sealed for life stainless steel tank filled with a small SF( , overpressure. The stainless steel tank is designed specifically to guarantee the safety of the operation personnel even with the internal arc faults at the maximum fault capacity. Due to high internal are containment capacity of the tank the NXB in most cases withstands an internal fault without venting hot gases. The independent spring operating mechanism provides a guaranteed load break fault make capability by ensuring the opening and closing speed of the switch. 2. Technical data 2.1 Stanc , IEC 60129 Alternating current disconnectors and earthing switches IEC 60265-1 Iligh-voltage switches. Partl: lligh-voltage switches for rated voltages above I kV and less than 52 kV IEC 60694 Common clauses for high-voltage switchgear and controlgear standards ANSI/ IEEE C37.63 IEEE Standard requirements for overhead, pad-mounted, dry-vault and submersible automatic line sectionalizers for AC systems ANSI/ IEEE 037.71 Three-phase, manually operated subsurface load-interrupting switches for alternating- currents system GB3804 3-63kV high voltage load break switch GB/ T11022 Common specification for high voltage switchgear and controlgear standards Application The NXB and NXBD are available as two positions ( ON-OFF) or a three positions ( ON-OFF-EARTH) switch. When supplied as three positions switch the unit has facility to earth the line on one side of the switch. Both types of units can be supplied suitable for manual or electrical and manual or electrical only operation. The earth position on the three positions switch is manually selected only. The units can be provided with an optional feature to manually lock and electrically isolate the unit in the earthed, open ( OFF) or closed ( ON) position. NXBD is combined from two NXB swtiches, which can be used as Ring Main Unit on the pole. Extension application and sketch neap can be see as belows. Characteristic Sectos NXB and NXBD were designed for overhead network system for making and breaking load current, and can endure short circuit current. All the upbox were made in stainless steel or Aluminum alloy, processed with precision manufacture device. • Special for distribution automation system • Flexible 2-position and 3-position as option, 3-position switch can earth the circuit with inner earthing switches on one side. • Reflectible position indicator can be easily visible from ground, even at night. • Stainless tank resist for almost all the environment and can endure inner arc fault. • Ring type current transformer can easily installed on the insulator, and make the switch avoid from any trouble which caused by CT. ( compared with inner CT) • IPX7 for mechanism device of upbox, and 1P54 for below control box. • Modular construction makes it possible to upgrade the application with retrofittable accessories. The switch can be upgrade from manual operated to motor operated, and remote control. • Abundant and flexible accessories can be used in different application as option. • Equipped with DTU, Sectos can be used widely in overhead network as automation device, and can make different automation schemes by change the setting of REC. • Specially recommended for obtaining the maximum reliability in the harshest environments. • Three type insulator as optional, epoxy casting insulator, silicon rubber insulator and 400 series epoxy casting core. • Many kinds of communication tools and communication protocol can be offered for distribution automation. • Standards connectors ensure the switch can be suitable for most of the country, the switch can connect with cable, conventional overhead line and BLX type lines with insulated conductors, etc.