HIGH AND LOW VOLTAGE CONTROL RELAY

HIGH AND LOW VOLTAGE CONTROL RELAY

Connecting the electrical protection device (phase filler), an important protection device widely used in electrical distribution panels,

Specifically the main power sources, so that the electricity source is disconnected when one of the phases is missing or the voltage value changes from the pre-set values.
A very important topic explaining the connection of the electrical protection device (phase wires) /span>

, and it may be called by other names, such as: phase sequence relay or a device for protection against phase shortages and voltage changes.
What is an electrical protection device (phase filler)?

, and even in home electrical panels with the aim of protecting electrical loads.
Not only that, but it is also used to protect solar energy inverters from any increase or decrease in the voltage of the electricity network entering it,

And also from a 3-phase electric Vase falling.
Electrical Protection Devices
Components of the Electrical Protection Device (Vase Filler)
The device designated for 1-phase electricity consists of two points (L, N), in addition to three points: (NO, NC, COM).
The device designated for 3-phase electricity contains three points: (L1). ,L2,L3,N)

, in addition to the relay contact points: (NO, NC, COM).
Connecting the electrical protection device (1 phase)
Connect the electricity source to Connect two terminals (A1, A2) while ensuring the type of supply and the appropriate voltage.
Connect the open contact point NO in series with one of the terminals of the contactor coil or relay A1.
Connect the contact point NO The common contact COM with the supply line depends on the voltage value and the type of contactor coil current.
Connect the remaining contactor terminal or relay A2 with the supply line.
Connecting the 1 phase protection device
Built-in protection device against phase shortages and voltage changes 1 phase
Connecting the electrical protection device (3 phase)
Connecting the 3 phase power supply With the three points (L1, L2, L3, N) in order.
Connect a line from L1 to the common point COM.
Connect the open point NO with the contactor coil terminal K
Connect the other end of the contactor A2 with the neutral line of the electricity source.
Connect the power circuit of the motor by connecting the ends of the electricity source to the contactor points.

The main and output points with the terminals of the electrical load, such as the electric motor, for example.
Connecting the electrical protection device (phase filler)

What is required to protect the motor from falling phases or increases and decreases in the source voltage?
First:

Purchase a protective device that has the following protections:

(Protection against voltage shortages and voltage changes).
Second:

Buy a good quality contactor from a famous brand, such as:

ABB or any other brand, and choose it so that its current is at least 25% higher than the motor current.

Also make sure that the coil voltage and the type of current it operates on are compatible with your requirements.
Appropriate contactor = load current x safety factor ratio
= 27 x 1.25 = 33.75 amps
You can buy a contactor with a capacity of 40 amps.
Third:

Finally, connect the electrical protection device (phase filler)

With the contactor as shown in the diagram above in order to connect and disconnect the current from the electric motor based on the condition of the device.

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