Star Delta starter Control Circuit

Star Delta starter Control Circuit

Star Delta starter Control Circuit

This Diagram shows the star delta starter control circuit. Controlling the interchanging star connection & delta connection of an Alternating Current induction motor is acquired by means of a star delta or wye delta control circuit. The control circuit consists of push-button switches, magnetic contacts, and a timer. In this diagram, we simply use MCB, magnetic contactor, 8-pin relay, and stop and start button.

Diagram of Star Delta starter Control Circuit wiring

Components Need for this Project:

You can get the components from any of the sites below:

  1. Magnetic Contactor [See Buy Click Amazon]
  2. 8-Pin Relay [See Buy Click Amazon]
  3. DP MCB [See Buy Click Amazon]
  4. NO Switch [See Buy Click Amazon]
  5. NC Switch [See Buy Click Amazon]
  6. Indicator Light [See Buy Click Amazon]
*Please note: These are affiliate links. I may make a commission if you buy the components through these links. I would appreciate your support in this way!


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Components used to make the Star Delta starter Circuit:

01. Magnetic Contactor

Magnetic Contactor
Fig 2: Magnetic Contactor
A magnetic contactor is an electrical device used for load control, automation, and protection. It is much like a magnetic reel. However, relays are generally used for low power and voltage, on the other hand, when we think of high power, these heavy-duty contractors only come to mind. It basically works by switching the load on and off. It has 3 terminals whose inputs are denoted as L1, L2, L3, and outputs as T1, T2, and T3. The circuit of the load is made in automation mode or protection using auxiliary contacts. It has two types of terminals. 1) Normally Open (NO). 2) Normally Closed (NC).

02. 8-Pin Relay

8-Pin Relay
Fig 3: 8-Pin Relay
This relay is known as 8 pin relay because it has 8 terminals. When coil power is supplied. A magnetic induction is created due to which the connected sheet of the Com part moves towards the NO part changing to NO-NC. The former NC region loses conductivity and becomes NO. Thus, as long as power is supplied to the coil, the NO and NC positions will remain in the alternating state, and when the power is removed from the coil, it will return to its original position. This is basically how a relay switch works.

03. DP MCB

Fig 4: DP MCB
Double pole MCB can control two wires. This circuit breaker is generally used in single-phase electric lines. Double pole MCB circuit breaker input has two wires supply two wires and an output. In a single-phase line, A double-pole MCB circuit breaker is used to give good production. This circuit breaker is provided through phase and neutral circuit breaker, it is very safe. This circuit breaker is preferred for home appliances. A DP MCB usually trips for 2 reasons 1. Overload 2. Short circuit.

04. NO Switch

NO Switch
Fig 5: NO Switch
The operator switch has its contact in Normally Open condition. To make Ladder Logic you need to understand NO contact. A Classic Switch has one Input And one Output. In "No Switch," YoungBoy Raps About Ammunition, Murder, Firearms, and Firearm Attachments Such as a Switch. The contact of the switch whose contact is already open is NO. That is enough to understand. no switch in a circuit, then the circuit will not function as intended. to write a program such that when the red light is on, This switch is now in normally open condition. When you push the switch it will close and the red light will turn on.

05. NC Switch

NC Switch
Fig 6: NC Switch
Indicates the contacts of switches or automatic actionable devices. Simply put, the push switches, magnetic contactors, and relays that we use in the factory Normally have Close Contact exists. At this moment the switch will be in normally closed condition. Because already he is sitting close. When turned off the contact will open. To make ladder logic you need to understand NC contact. As already explained. The switch contact is already closed in NC. That is enough to understand.

06. Indicator Light

Indicator Light
Fig 7: Indicator Light
An electric current Flow Indicator Senses The electrical Current Through an electrical device And produces visible feedback to Indicate Proper Operation. The Current Flow Indicator Has Voltage And Current Regulation Craving First And Second Inputs Connected To The First And Second Conductors, Respectively. This Publication Provides updated Statistics on a Comprehensive Set of social, Economic, Financial, and Environmental Measures as Well as Select Indicators for Sustainable Development Goals.

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Frequently Asked Questions

What is a star delta starter control circuit?

Star-Delta starter is a fine method of starting the induction motor which reduces the starting torque and starting current flow. Star delta starter design normally consists of three contactors, a circuit diagram breaker, and a timer for setting the time for star delta switching.

Which relay is used in the star-delta starter?

Star-Delta Type 1 coordination: The thermal overload relay is placed in the Delta circuit diagram. For Type 2 coordination the thermal overload relay selection is based on the Full load current rating and the selection for type 1 coordination is based on Full load current / Sqrt 3 (FLC/1.732).

What are the advantages of star and delta connection?

2. Another advantage of starting connected winding with earthed neutral is that the maximum voltage to the core is limited to 58% of line voltage, whereas in delta connected, in case of line to earth fault, the maximum voltage between winding and core increases to full line voltage.

Which is the higher current star or the delta?

So the delta connection has the highest starting current. Of course, then the Delta also has the highest and starting torque. The Star connection offers the reduced starting current flow for loads requiring a lower starting torque.

How does a star-delta starter reduce the starting current?

A star delta starter reduces the starting current flow by connecting the motor winding in Star at the time of the starting. This reduces the voltage across the winding. The voltage across the winding would be( 1 or Sqrt,3 )*Line Voltage.

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