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  Growler Test

Introduction to Growler Test

An easy and most general method to test armature winding for short and open coils is through a growler.

There are two types of growlers. They are as follow:          

1)  Internal growlers 

2) External growlers.

An external growler is employed for testing small armatures while the internal growler for large DC armatures and AC motor stator windings.

External growler

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An external growler that is displayed in the above diagram is an electromagnetic device which is employed to detect and locate grounded, shorted and open coils in an armature. This growler contains a coil wound around an iron core and is connected to a 240 volt AC line. The core is usually H shaped and cut out on to that is why the armature will fit on it, as displayed in the below diagram.

1040_Growler Test Homework Help 1.jpg

While an alternating current is applied to the growler coil, the voltage will be made in the armature coils through transformer action.

Internal growler:

An internal growler, like the one employed for stators, may be employed for armatures as well. Internal growlers are made with or without built-in feelers. The growler that is with a built-in feeler has a flexible blade attached to the growler that is why a hacksaw blade or identical instrument is not essential. This type is particularly wanted in smaller stators that contain no room for a separate feeler. The below diagram depicts an internal growler with a separate feeler, employed for large armatures.

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Diagram:  Internal Growler

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