Control circuit of the sts the control circuit figure 2a takes as input the voltage magnitudes of the two feeders and performs a load transfer when needed.
Static switch circuit diagram.
During the positive half cycle of the sinusoidal waveform the device is forward biased but with switch s 1 open zero gate current is applied to the thyristor and it remains.
Current flow will be through load r l s 1 r 1 and gate to mt1 junction of the thyristor.
Control system and metering system.
Static switches play a key role in assuring this resilient performance.
In some ups installations the transfer is delayed for a finite time to allow a load protection fuse or circuit breaker to act and clear the fault so avoiding subjecting the load to raw mains or even.
Typical static switch circuit.
A ups bypass switch is a non essential addition to an uninterruptible power supply system that while not integral to ups operation is definitely useful in the event of maintenance or repair.
The above thyristor firing circuit is similar in design to the dc scr circuit except for the omission of an additional off switch and the inclusion of diode d 1 which prevents reverse bias being applied to the gate.
Today s upss that use modular technology are flexible and easily scalable while protecting their critical load from many different threat types.
Parts of a static transfer switch.
A transfer switch is an electrical switch that switches a load between two sources.
The use of one static switch per module is favoured to avoid a single point of failure.
Silicon controlled rectifiers of which the internal structure is made up of.
A breaker or a bus assembly.
This circuit is wired the same way as the 3 way lights at this link.
An online system can also use the static switch to transfer the load to bypass if an overload condition drawing excessive current develops.
A static power transfer switch consists of three basic parts.
Together with the power source priority selection button enables operators to make full use of the apparatus.
When this current reaches.
The circuit operation occurs when switch s 1 is closed since the triac q 1 will initially be in the block ing condition.
In this diagram two 3 way switches control a wall receptacle outlet that may be used to control a lamp from two entrances to a room.
The block diagram of a static switch is shown below.
Capable of providing all information concerning equipment operation status.
The source is at the sw1 where the hot is connected to.
The core items you need in order to be protected in the event of power failure are a ups and a battery to supply the power under standard operation this should be all that is required.
Three wire cable runs between the switches and the outlet.
3 way switched outlet wiring.
Sts 4p 100 400 600 a static switch is fitted with a block diagram with led indicators and a 4 line 20char display.
