BU 3420 - MV fuses / MV Switch Disconnectors Indoor NAL/F AIRSWITCH series BWMW Rotary type: CEF AM

BU 3420 - Switch Disconnector type NAL/F Type NAL / F - INDOOR Based on modular principle Simply and reliable design, A lot of additional equipment, Wide range of application with easy installation and maintenance.

BU 3420 - Switch Disconnector type NAL/F 12, 17,5 i 24 kV / 400, 630 i 1250 A 36 kV / 630 i 800 A

BU 3420 - Switch Disconnector type NAL/F 3-pole switch disconnector and switch fuse combination IEC 265-1 (actual: IEC 60 265-1) - 100 close / open operations at 630 A Class E1 24kV Class E3 12/17,5/36 kV IEC 420 (actual: IEC 62271-105) Alternating current switch-fuse combinations More than 500 000 units in service world wide Production capacity of 25 000 units per annum

BU 3420 - Switch Disconnector type NAL/F

BU 3420 - NAL Switches – main types of switches

BU 3420 - NAL Switches – main types of switches

BU 3420 - Switch Disconnector type NAL/F Auxiliary switch 2;4;8NO+NC Motor operation on switch mounted Shaft extension for Left-Hand side operation Mechanical interlocking Earthing switch type E Operating mechanism Hand operating type HE (upper part) - bevel gear Operating handle Auxiliary switch for installation Of fuse interruption Shunt trip coil for A-mechanism (lower part) Front bearing Motor operation mounted in front

BU 3420 - Switch Disconnector type NAL/F Earthing switch type EB For separate installation Quick make earthing switch type E

BU 3420 - Switch Disconnector type NAL/F Earthing switches Earthing switches with making capacity Mounted on pivot side of the switch or on fuse base Mechanical interlocking Earthing switch for separate installation

BU 3420 - Switch Disconnector type NAL/F UEMC 40 K3 NM 24…220 Type UEMC 40 K3 /NM mounted on the mechanism Type UEMC 40 A2 mounted on the front panel

BU 3420 - Switch Disconnector type NAL/F 1 2 3 1. Latched snap action - type KS 2. Stored spring energy – type A With two springs 3. Snap action -type K With one spring

Hand operating mechanism type HE: BU 3420 - Switch Disconnector type NAL/F Hand operating mechanism type HE: Bevel gear Connection rod Front bearing with cardanic joint- optional blocking coil Operating handle Shaft extension - Left – hand side operation - Mechanical interlocking

BU 3420 - Switch Disconnector type NAL/F Mounting example for hand operating mechanism 90 - Transmission with HE

BU 3420 - Switch Disconnector type NAL/F Applications Cable sectionalizer and transformer switch Motor switch (with motor fuse CMF) Switching of capacitor banks Component for local manufactured panels Used in switch cubicles Compact substation (kiosk) Utility and industrial application

BU 3420 - Switch Disconnector type NAL/F Application example

BU 3420 - Switch Disconnector type NAL/F Applications NAL in substation NAL in UniSafe and UniGear cubicle

BU 3420 - Switch Disconnector type NAL/F Open switch

BU 3420 - Switch Disconnector type NAL/F Connecting of the switch Connecting main knife

BU 3420 - Switch Disconnector type NAL/F Connected switch

BU 3420 - Switch Disconnector type NAL/F Switching off flame arc breaking

BU 3420 - Switch Disconnector type NAL/F

BU 3420 - Switch Disconnector type NAL/F

BU 3420 – AirSwitch series Available in two versions: The switchboard ROTARY switches and isolators AM AR/AS Available in two versions: AM type switch disconnector (24kV; 400/630A) AR/AS type rotary isolators (24kV; 400/630/ 800/1250A)

BU 3420 - Switch Disconnector type AM Switch Disconnector AM Air-insulated Rotary type 630 A breaking capacity 40 kA making capacity 2 positions: LINE – OPEN Provide segregation between busbar and feeder compartments Interlocked with a separate eathing switch

BU 3420 - Switch Disconnector type AM Switch Disconnector AM Voltage signalling device Key lock Door lock Auxliary contacts Shunt opening release

BU 3420 - Isolators type AR/AS Switch Isolator AS/AR Air-insulated Rotary type 400, 630, 800, 1250 A rated current up to 25 kA short time withstand current

BU 3420 - Isolators type AR/AS Isolators AR/AS Voltage signalling device Key lock Door lock Auxliary contacts

BU 3420 - Switch Disconnector type AM Switch disconnector applications

BU 3420 - Switch Disconnector type AM Switch disconnector with fuses 1 2 3 Caption: 1 Busbars 2 Switch Disconnector 3 Fuses 4 Earthing switch 5 Cable fixing point 5 4

BU 3420 – Isolators type AR/AS Isolators applications

BU 3420

BU 3420 – Switches AUSTRALIA CHINA HONG KONG INDIA INDONESIA JAPAN ASIA: AUSTRALIA CHINA HONG KONG INDIA INDONESIA JAPAN KOREA NEW ZEALAND MALAYSIA PAKISTAN PHILIPPINES SINGAPORE TAIWAN THAILAND VIETNAM EUROPE: WE+CEE AUSTRIA BELGIUM BELARUS BULGARIA CROATIA CZECH REP. DENMARK ESTONIA FINLAND GERMANY GREAT BRITAIN GREECE HUNGARY ICELAND IRELAND ITALY LATVIA LITHUANIA LUXEMBOURG NORWAY POLAND PORTUGAL ROMANIA SLOVAKIA SPAIN SWEDEN SWITZERLAND MIDDLE EAST: ARAB EMIRATES EGYPT IRAN ISRAEL JORDAN LEBANON OMAN QATAR SAUDI ARABIA SYRIA TUNISIA TURKEY SOUTH&NORTH AMERICA: ARGENTINA BOLIVIA BRAZIL CANADA CHILE COLOMBIA ECUADOR MEXICO PARAGUAY PERU USA VENEZUELA AFRICA: SENEGAL SOUTH AFRICA TANZANIA

BU 3420 - Switch Disconnector type NAL/F Modern machinery ISO 9001/14001 certified IEC; ANSI, CSA, GOST Standards

BU 3420

BU 3420 – switch disconnectors – normal operating conditions Maximum ambient temperature +400C Minimum ambient temperature is -250C The altitude does not exceed 1000m (3300ft) The ambient air is not excessively polluted by dust, smoke, corrosive or flammable gases, vapour or salt Typical conditions of humidity for indoor installations are fulfilled

BU 3420 - switch disconnectors – Standards IEC 60265 Switches for voltage above 1 kV and less than 52 kV IEC 60694 Common specification for high-voltage switchgear and controlgear standards IEC 60129 Alternating current disconnectors and earthing switches IEC 62271-105 High voltage switchgear and controlgear Part 105-Alternating current switch-fuse combinations former name IEC 420

BU 3420 - switch disconnectors – application Altitude correction factors for Test and Rating Voltages Altitude correction factors for Rated Current and Temperature Rise

BU 3420 - switch disconnectors – Switch-fuse ratings Switch nameplate

BU 3420 - switch disconnectors – breaking capacity

BU 3420 - switch disconnectors – breaking capacity

BU 3420 - switch disconnectors – breaking capacity

BU 3420 - switch disconnectors – breaking capacity

BU 3420 - switch disconnectors – breaking capacity

BU 3420 - switch disconnectors – breaking capacity

BU 3420 - HV fuses – Coordination with load break switch Minimum breaking current with switch disconnector coordination

BU 3420 - switch disconnectors – Operating methods When using NALF - A or KS operating mechanism are suitable only

BU 3420 - switch disconnectors – Operating methods

BU 3420 - switch disconnectors – Coordination with switch Transfer current (striker operation) value of the three-phase symmetrical current at which the fuses and the switch exchange breaking duties NOTE Above this value the three-phase current is interrupted by the fuse only. Immediately below this value, the current in the first-pole-to-clear is interrupted by the fuse and the current in the other two poles by the switch, or by the fuses, depending on the tolerances of the fuse time current characteristic and the fuse-initiated opening time of the switch.

BU 3420 - HV fuses – Coordination with load break switch

BU 3420 - HV fuses – Coordination with load break switch The fuses are incorporated in order to extend the short-circuit breaking rating of the combination beyond that of the switch alone. They are fitted with strikers in order both to open automatically all three poles of the switch on the operation of a fuse and to achieve a correct operation at values of fault current above the minimum melting current but below the minimum breaking current of the fuses The minimum breaking current is normally in the range from 2 to 7 times fuse rated current (dependent of fuse rated current). Naturally the question is what will happen if we get a fault current in the range from minimum melting to minimum breaking current? If this happen, when the last conductor melts off, an arc starts and we get an arc voltage between the fuse terminals as described earlier. The fuse will withstand the arc and the energy dissipated for 200 to 400 ms. Due to the arc voltage the striker system will operate and combined with a load break switch, tripping on signal from the striker, the load break switch will open and interrupt the current before the fuse is damaged.

BU 3420 - HV fuses – Coordination with load break switch That means in the range from minimum melting current to minimum breaking current the fuse gives the signal and the breaker clears the fault. In this way by combining a load break switch with a pre charged operated mechanism which can be tripped by the fuse striker system, we can obtain protection from minimum melting current and up to the max breaking current for the fuse. When we reach a certain fault current level the fuse will break and clear the fault before the breaker is able to open due to the mechanical operating time of the switch (this is normally 40 -70 ms dependent of type) and we do not get any problem with the breaking capacity of the load break switch, the fuse has already cleared the fault when the breaker opens. We will have a certain range where fuse and switch have approximately same clearing time. This happen at the take over current as shown on earlier slide. The switch itself must have a max. breaking capacity which overlaps the take over point. The requirement to a fuse switch combination is given in IEC 62271-105 (former IEC 420). and will determine what max. rated current the fuse can have to be sure you have the necessary safety margin for coordination between fuse and switch.

BU 3420 - switch disconnectors – general rules Low over-currents

BU 3420 - switch disconnectors – general rules Minimum breaking current

BU 3420 - HV fuses – general rules

BU 3420 - HV fuses – Coordination with load break switch

BU 3420 - HV fuses – Coordination with load break switch

BU 3420 - HV fuses – Coordination with load break switch

BU 3420 - HV fuses – Coordination with load break switch

BU 3420 - HV fuses – Coordination with load break switch

BU 3420 - NAL Switches – Tightening forces

BU 3420 - NAL Switches – Assembling mistakes

BU 3420 - NAL Switches – Assembling mistakes

BU 3420 - NAL Switches – Assembling mistakes

BU 3420 - NAL Switches – Your questions?

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