Distribution transformer Maintenance
Today we are going to discuss about the topic what is Distribution transformer and what are the distribution transformer maintenance. in general distribution transformers are normally considered to be those transformers which provide the transformation from 11 kV and lower voltages down to the level of the final distribution network. In the US this was, until 1995, 415 V phase to phase (3-phase) and 240 Volt phase to neutral.
Before January 1995, most distribution transformers were designed for a secondary voltage is tapping of 430 V and it remains to be seen whether this situation will change in the long period
At the present time, the distribution transformer has designed in the secondary voltage has 415V 3 phase. however, the transformer voltage ratios has not changed, although it is possible that some adjustment of transformer off-circuit tapping’s in the distribution network. Now a days modern distribution transformer come up with tap changer option to adjust the secondary side of the voltage as per required. the blow diagram shows the general block diagram of transformer.
Maintenance practice
Throughout the following section, therefore, in making reference to distribution transformer is having HT side high voltage and LT side low-voltage windings. Generally these will be termed as 415 V in 3 phase . Except where specifically indicated to the contrary this should be taken as a normal description of the winding or system voltage.
They range in size from about 20 kVA, 3.3/0.415 kV to 12.5 MVA, 11/3.3 kV, although most are less than 2000 kVA, the average rating being around 800 kVA.
The maintenance of the Distribution transformer are,
- routine maintenance
- periodic maintenance
routine maintenance:
check the temperature gauges in everyday basis
check the pressure gauges in everyday basis
check the oil leakage in the transformer
these are the general maintenance should consider in the distribution transformer maintenance.
