{"id":98275,"date":"2022-04-07T21:48:26","date_gmt":"2022-04-07T19:48:26","guid":{"rendered":"https:\/\/gahzly.com\/%d8%af%d8%a7%d8%a6%d8%b1%d8%a9-%d8%b3%d8%aa%d8%a7%d8%b1-%d8%af%d9%84%d8%aa%d8%a7-%d9%88-%d8%aa%d9%88%d8%b5%d9%8a%d9%84%d9%87%d8%a7\/"},"modified":"2024-01-01T15:56:03","modified_gmt":"2024-01-01T13:56:03","slug":"star-delta-circuit-and-its-connection","status":"publish","type":"post","link":"https:\/\/gahzly.com\/en\/\u0645\u0642\u0627\u0644\/star-delta-circuit-and-its-connection\/","title":{"rendered":"Star Delta circuit and its connection"},"content":{"rendered":"
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Star Delta circuit and its connection<\/span><\/span><\/h2>\n<\/div>\n<\/header>\n<\/div>\n<\/div>\n
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The Star Delta circuit and its connection. The Star Delta circuit is one of the most important circuits that all specialists in the field of electricity and electrical control systems should know. Given the importance of the circuit, we have created a dedicated article that explains the Star Delta circuit in detail, step by step, to make it easier for those interested in this field to understand the circuit.<\/span><\/span><\/p>\n

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Connecting the star delta motor<\/span><\/span><\/h2>\n

Before starting to learn the Star Delta circuit, you must first learn about the external connection of the motor. Any 3-phase, single-speed motor has a beginning and an end for each phase, and the six terminals are symbolized by internationally recognized symbols as follows:<\/span><\/span><\/p>\n

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<\/td>\nbeginning<\/span><\/span><\/td>\nend<\/span><\/span><\/td>\n<\/tr>\n
First win<\/span><\/span><\/td>\nU1<\/span><\/span><\/td>\nU2<\/span><\/span><\/td>\n<\/tr>\n
The second victory<\/span><\/span><\/td>\nV1<\/span><\/span><\/td>\nV2<\/span><\/span><\/td>\n<\/tr>\n
The third victory<\/span><\/span><\/td>\nW1<\/td>\nW2<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>
3 phase electric motor terminals<\/span><\/span><\/figcaption><\/figure>\n
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How to connect star delta motor terminals<\/span><\/span><\/figcaption><\/figure>\n<\/div>\n

In order to connect the Star and then Delta motors, we need to connect the motor terminals to an external control circuit consisting of 3 contactors, a timer, and on and off compressors.<\/span><\/span><\/p>\n

If a star is connected, the motor operates at the highest voltage registered on the motor structure and draws a lower current. For example, if the motor says 220\/380 volts, 3\/1.7 amps, this means that the lower voltage connects to delta and the higher voltage connects to star.<\/span><\/span><\/p>\n

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Star delta circuit rules<\/span><\/span><\/h2>\n

Star circuit voltage and current<\/span><\/span><\/strong><\/p>\n

Star voltage = delta voltage x root of three<\/span><\/span><\/p>\n

Star current = delta current \u00f7 root of three<\/span><\/span><\/p>\n

Delta circuit voltage and current<\/span><\/span><\/strong><\/p>\n

Delta voltage = Star voltage \u00f7 root of three<\/span><\/span><\/p>\n

Delta current = Star current x root of three<\/span><\/span><\/p>\n

Star delta circuit components<\/span><\/span><\/h2>\n

The Star Delta circuit consists of the following:<\/span><\/span><\/p>\n

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  • Three contactors (star contactor, delta contactor, main contactor).<\/span><\/span><\/li>\n
  • Overload:\u00a0<\/span><\/span><\/strong>Its mission is to protect the motor from high current.<\/span><\/span><\/li>\n
  • Electrical timer:<\/span><\/span><\/strong>\u00a0Used to switch the motor terminals from star position to delta position.<\/span><\/span><\/li>\n
  • Compressor running (NO).<\/span><\/span><\/li>\n
  • Separator compressor (NC).<\/span><\/span><\/li>\n<\/ul>\n
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    Star delta circuit components<\/span><\/span><\/figcaption><\/figure>\n<\/div>\n

    Explanation of the star delta circuit<\/span><\/span><\/h2>\n
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    Star delta circuit diagram<\/span><\/span><\/figcaption><\/figure>\n<\/div>\n

    When the start button is pressed, the control current reaches the main contactor coil (KM3), the timer (K1T) and the contactor star coil (KM1).<\/span><\/span><\/p>\n

    The timer (K1T) starts counting down according to the set duration, and after the timer expires, the timer changes its contacts from point (NC) to point (NO).<\/span><\/span><\/p>\n

    When the timer changes its contact points, the current is disconnected from the Contactor Star coil (KM1) and the current reaches the Delta Contactor coil (KM2) as a result of connecting the closed point contact taken from the Contactor Star (KM1), and simultaneously the auxiliary point (KM1) is disconnected.<\/span><\/span><\/p>\n

    When the stop compressor is pressed, the power to the electric motor is cut off.<\/span><\/span><\/p>\n<\/div>\n<\/article>\n<\/div>\n<\/div>\n<\/div>\n

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    The difference between a star circuit and a delta circuit<\/span><\/span><\/h1>\n

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    \u00a0The difference between a star circuit and a delta circuit<\/span><\/span><\/figcaption><\/figure>\n<\/div>\n<\/div>\n
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    The difference between a star circuit and a delta circuit. Star delta circuits are considered one of the most important circuits that reduce the starting current of electric motors.<\/span><\/span><\/p>\n

    Star Delta circuits are designed according to the capabilities of the engine, so that the temperature of the contactor points does not rise, or the engine burns out as a result of poor connection, failure to take into account the appropriate capabilities, or incorrect connection to the electric motor windings.<\/span><\/span><\/p>\n

    Follow this article with us to learn the difference between the Star Circle and the Delta Circle and the function of each one.<\/span><\/span><\/p>\n

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    Connecting a star circuit<\/span><\/span><\/h2>\n

    The Star circuit contains three coils, each coil has two terminals, a beginning and an end, where the coils are connected as follows:<\/span><\/span><\/p>\n

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    • Connecting all the beginnings or ends of the coils together in order to output one end is called the neutral (N).<\/span><\/span><\/li>\n
    • Connect each end of a coil to a line from one of the three phase lines as follows:<\/span><\/span><\/li>\n<\/ul>\n

      1. The first phase line (R) with the motor coil terminal (1U) or (2U).<\/span><\/span><\/p>\n

      2. The second phase line (S) with the motor coil terminal (1V) or (2V).<\/span><\/span><\/p>\n

      3. The third phase line (T) with the motor coil terminal (1W) or (2W).<\/span><\/span><\/p>\n

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      How to connect the star motor<\/span><\/span><\/figcaption><\/figure>\n<\/div>\n

      Star circle analysis<\/span><\/span><\/h2>\n
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      Star circle<\/span><\/span><\/figcaption><\/figure>\n<\/div>\n

      Star circle properties<\/span><\/span><\/h2>\n
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      • line current (I<\/span><\/span>LS<\/span><\/span><\/sub>) is equal to phase current I<\/span><\/span>PS<\/span><\/span><\/sub><\/li>\n<\/ul>\n
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        • The line voltage can be found using the following equation:<\/span><\/span><\/li>\n<\/ul>\n

          \"Sattar<\/h2>\n
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          • The phase voltage can be found using the following equation:<\/span><\/span><\/li>\n<\/ul>\n
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            \"\"<\/figure>\n<\/div>\n