Transformer logbook
Description and Types of parameters.
1- Transformer logbooks:
Transformer logbook is a parameters note book where the required parameters are noted down in manually. The all parameters data is noted down in a frequency base according requirement as a hourly, 2 hourly, 4 hourly or per day.
We can observe the transformer condition on daily basis, monthly basis, quarterly basis and annually basis. If any parameters is not functioning according default value then we can check and find out the problem. If any fault is occurred suddenly then we can check logbook data related fault.
2- Transformer logbook format :
3- Types of logbook parameters. :
Different types parameters are noted down in logbooks in technical system as per requirement. which below mentioned.
- Date and time.
- Transformer input voltage
- Transformer out put voltage
- Transformer current
- Transformer winding temp
- Transformer oil temp.
- Transformer oil level.
- Dry type transformer temp.
1- Date and Time:
Date and time is the most important in logbook. If we want to know about exact parameters from last week then we can easily find out.
2-Transformer input voltage:
HT energy consumption is taken from HT meter in the format of KVAh. Many reading are available in HT meters but billing is processed in KVAh formate.
3- Transformer out put voltage.
Ones time recorded highest load limit is called a maximum demand. It should be low in against of section load. Section load is the highest load of premises which has to be approved from electricity board authority.
4- Transformer current.
HT voltage is received from electricity board according HT connection like as 11KV or 33KV. If the voltage is receiving as low or high against 11KV or 33 KV then we will have to increase or decrees from substation.
5- Transformer winding temp.
Premises total load is checked in HT panel through amp meter. R , Y and B phase amp are taken for checking load and unbalance load.
5- Transformer oil temp.
Line power factor should be .98 of .99 . If the power factor value is low as .85 then energy consumptions will be 100 present but actual energy will be used only.85 % . It means 15 % energy losses so power factor value is important for system.
6- Transformer oil level.
Control supply is used for all protection relay auxiliary supply, ON and OFF TNC switch, Circuit breaker shunt and closing coil. The UPS or battery is used for control supply. If the battery voltage then 12 volt is used. If the UPS supply then 230 V AC is used.
7- Dry type transformer temp.
Temp and humidity meter are used in HT room because high temp and high humidity is very dangerous for technical system. So temp and humidity parameters are required.
