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  Protection of Transformer  Equivalent Circuit diagram of single phase Transformer   Core type Transformer and Shell type Transformer  Transformer with winding Resistance and Magnetic Leakage  Transformer with winding Resistance but No Magnetic Leakage  Equivalent Resistance of single phase Transformer  Magnetic leakage of Single Phase Transformer  Oil Flow Indicator of the pump of Power Transformer  Silica Gel Breather of Transformer  Oil Pump of Transformer   Radiator of Transformer and working of Radiator  PRD of Transformer  MOG ( magnetic oil gauge ) of Transformer  Bushing of Transformer ( for H.V side and L.V side )  WTI and OTI of Transformer  Buchholz Relay of Transformer and Working of Buchholz Relay  Conservator tank of Transformer  What is a Power Transformer ?  Short Circuit Test or Full load Cu loss of Transformer   Open circuit test or No load Test of Transformer   Parallel operation of 3-phase Transformer  Earthing or Neutral Grounding Transformer   Transformer on On load Condition   What is a Transformer ?  E.m.f Equation of Transformer   Transformer on No load Condition


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MOG ( magnetic oil gauge ) of Transformer

The MOG (Magnetic Oil Gauge) is a device by which we can supervise the level of liquid/oil inside the tank or conservator of power transformer and also gives us an alert low oil level indication with making mercury switch. It is connected at the bottom of the conservator tank which is shown in figure.

Construction & Working:

The Construction & Working of MOG is given below. The magnet of MOG consists inside the conservator drives and the magnet positioned is fixied outside of the conservator tank of power transformer. The driving magnet rotates and acquires position corresponding to height of oil level as it is link with the float. The float is hinged and swings up or down when oil level rises or falls. This rise or falls rotates the driving magnet clockwise or anticlockwise with the help of bevel gear. The follower magnet carries a pointer & a cam. The pointer reads oil level and cam is set to operate the switch of predetermined low level which is shown in fig -2.



The standard calibration of dial of MOG are Empty , ¼, ½, ¾, and Full. Calibration of marks Empty & Full is done after leaving 65 mm from bottom and top of conservator to avoid striking of float to conservator wall.

Indicator can be mounted in titled position towards ground ( max 300C )for easy viewing by fixing mounting pad at desired angle or the indicator can be mounted by keeping dial and mounting pad in vertical position. The position of indicator on the conservator can be selected to suit site condition.
Alarm Circuit:
One normally open mercury switch is provided for annunciation low level Alarm.

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