power systems loss

69KV VOLTAGE TRANSFORMER SAMPLE TECHNICAL SPECIFICATION Sample specification of a 69kv Voltage Transformer. Description: The unit should be magnetic type and for connection between phase and earth in networks with isolated or earthed neutral. • Designed with low flux density in the core and can therefore be operated at 190% rated voltage for more than 8 hours • Fitted with a secondary measuring winding and a tertiary earth-fault winding • Hermetically sealed, which means no need for regular maintenance procedures • Primary terminals shall be suitable for connection of copper or aluminum connectors. • All external parts are hot-dip galvanized • High seismic withstand capability (0.5G) For Oil-Filled Type: The unit shall be hermetically sealed and of the minimum oil-filed type and compact design. All sealing shall be located below the oil level. The expansion room shall be of a gas cushion type filled with nitrogen. Oil level should be of the reflection type and without moving

Guide for instrument transformer standard referring to IEEE standards. Scope of the Standard This standard is intended for use as a basis for performance, interchangability, and safety of equipment covered, and to assist in the proper selection of such equipment. This standard covers certain electrical, dimensional, and mechanical characteristics, and takes into consideration certain safety features of current and inductively coupled voltage transformers of types generally used in the measurement of electricity and the control of equipment associated with the generation, transmission, and distribution of alternating current.

What are the name of the basic parts of a Power Transformer? We can not deny the fact that only a handful of electrical engineering students are presently familiar with power transformers especially on what it looks like. Unlike a transformer we found in our homes, a power transformer’s appearance and construction is somewhat more complicated. It is not just a simple winding with a primary and secondary terminal although basically any transformer has one. The function that a power transformer plays in an electrical system is very important that an electric utility can not afford to loss it during its operation. Our discussion here will focus more on the basic parts and functions of a power transformer that are usually tangible whenever you go to a substation . Although not all power transformers are identical, nonetheless they all have the following listed parts in which the way of construction may differ.