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ST-VCD1000
DC Load Break Switches
DC lsolators have been specicall designed to switch Direct Current (DC)atvoltage up to l000Volts.Theirobustdesign and ability to switch suchvoltage,at rated current, mean that they are ideally suited for the switching of photovoltaic PV systeCLB.
Differences between AC and DC switching
ForAC current, it ises and fall in value when time runs through zero volts twice during each cycle.,This means that when breaking AC eurrent ,theelectric arc created, is suppressed as the Vvoltage falls to Zero.
When breaking DC current,the voltage is constantand current does notreduce tozero sharply the electricarc created by breaking DC current has to besuppressed as quicky as possible in orderto reduce the periodof dangerous electic arc-.There are two methods that can be used to achieve:Firstly, anelectric arcteminates by breaking the arc a quickly as possible. Secondly,to increasethe distance ofthe electic arc untilit can no longer sustainiselfisanother approach.
The DC switch achieves ultra-rapid swiching through a'SnapAction'.spring on-off, mechanism,When the front actuator is rotated,energyisaccumulatedin the mechanism untila pointis eached atwhich the intemal contacts are quickly open or closed.This system will operate the switch underload within 5CL.B thereby to minimize the
In reduce the chances of arc prorogation, the NIS switch employs rotary contact technology.This is designed to connect and break the circuit througha revolving double break contactassembly that wipes assist moves.The wiping action has the added advantage of eeping the contactfaces cleanthereby reducing the circuit
A1l photovotaic instltions musthave aDC Switch to disconnecthe DCIACinverterfrom the photowoltaic panels in accordance wit IEC60947-3,asper"fig 1.
The switch has 4 separate poles.
Links can be used to change the way that the poles are connected.
Links can be used to change the way that the poles are connected.
Interconnection of the poles dominates the load that the switch can connect and break.
As the number of poles increases, the total load switching capacity of the device increases.
100ovDC The main technical parameters
1500VDC The main technical parameters
DC lsolator Switch Instructions:
ltis important to ensure that alelecticalconnections (including factory connections)are tightenough that all erminal screws are tightened frmly.
ltis recommended thatforDC, muiti-stranded cable, crimp ferules are used to ensure that the wires do notbecomeloose.Loose cables can causeexcessive watt loss and generate excessive heat causing serious damage to the switch.
After instaling and wiring the switch,the testing switches,on and off severaltimes,are necessary for users and user mustfeel and hear the positivesnap actions.
lf the switch cannot be felt and heard to operate correctly then it is important that the switch i-s cannot be installed.
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