A transformer with a turns ratio which provides a higher than rated voltage at no load and rated voltage at rated load.
Potential transformer specification pdf.
Some definitions and requirements of these standards such as csa c88 m90 ieee c57 12 00 and iec 60076 are different.
Sometimes a voltage transformer may have two or more than two secondary cores.
3156 part i iv.
The emergency rating of potential transformers is defined at one minute of operation thus enough time for protective equipment to operate.
This is a one of the important specifications of voltage transformers.
The purpose of the potential transformer is to provide an isolated secondary voltage that is in phase and exact proportionate representation of primary voltage.
Potential or voltage transformer.
Specification for voltage transformer.
Then these values are the sum of the output of all the secondary winding of a single voltage transformer.
The following have different explanations in these standards.
High voltage general purpose transformers 2 4kv to 15kv 15kva through.
Potential transformer pt definition the potential transformer may be defined as an instrument transformer used for the transformation of voltage from a higher value to the lower value.
The potential transformers and accessories covered by this specification shall comply with the requirement of the latest edition of the following standards unless otherwise stated in this specification.
Potential transformers are used for both protection and metering purposes.
This transformer step down the voltage to a safe limit value which can be easily measured by the ordinary low voltage instrument like a voltmeter wattmeter and watt hour meters etc.
Base styles and ratings are shown below.
This guide specification covers the requirements for three phase pad mounted liquid filled transformers of the dead front and live front types for exterior applications.
Adhere to ufc 1 300 02 unified facilities guide specifications ufgs format standard when editing this guide specification or preparing new project specification sections.
Many specifications list a number of transformer standards and make a statement in the specifications that the transformers must meet these standards.
Continuous rating the constant load which a transformer can carry its rated primary voltage and frequency without exceeding its specified temperature rise.
These transformers cannot be used for reverse feed.
A potential transformer must be capable of operating at 110 above rating voltage continuously provided the secondary burden in volt amperes at this voltage does not exceed the thermal rating.
Application guide for voltage transformers.
