CT & PT Testing
Video
Theory
CT/PT Analyzer
KPM-CT/PT Analyzer is an all in one solution for testing all type of CT/PT as per IEC standards. It is an equipment with high ROI ( Return On Investment ) . Below features make KPM CT/PT analyzer and ideal tool for CT/PT Manufacturer , Testing labs , Substations (Upto 765KV) , Power Plants etc.
Features
-
Low Testing Time (Completes all test for CT/PT Winding & Cores in few min)
-
Simple connection (Simple one time connection)
-
Highest Accuracy (0.05% for turns ratio & winding resistance )
-
Portable & Light Weight ( < 15KG )
-
High Interference Rejection (Can be used in 220/400/765 KV Live Switchyards )
HVCTR ( HV CT Ratio Tester)
Online HV CT Ratio Tester (KPM-HVCTR) – High Voltage Current Transformer Ratio Tester
As the name suggests Online HV CT Ratio Tester (KPM-HVCTR) is an innovative product to measure Key line / CT parameters of upto 33KV system .
Online HV CT Ratio Tester (KPM-HVCTR) is used for the determination of:
CT/PT Tester
KPM-CT/PT Tester is an automatic device used for testing of instrument transformers by injection of primary current .
CT/PT Tester is capable of conducting below tests on both CTs & PTs
1) Turns Ratio
2) Excitation Curve Plotting
3) Polarity
Technical Specifications -:
Primary Current Injection Kit
This substation testing device is designed to grant high current output when needed in substation commissioning activities. KPM PIK Series of equipment is having below features-:
-
High current output up to 8000 A
-
Powerful output up to 35 kVA
-
Customised Design.
-
Designed for primary injection testing of protection relays and circuit breakers, for commissioning and revamping of substations and electrical network
-
Modular design for easy transport
-
Heat run.
Video - CT/PT Analyzer
KPM CT PT Analyzer ( https://www.kpmtek.com/ctpt-testing-app )
Theory - CT/PT Testing
CT (Current Transformer) – Theory
Like any other transformer, a current transformer has a primary winding, a magnetic core, and a secondary winding. The alternating current flowing in the primary produces an alternating magnetic field in the core, which then induces an alternating current in the secondary winding circuit. An essential objective of current transformer design is to ensure that the primary and secondary circuits are efficiently coupled, so that the secondary current bears an accurate relationship to the primary current.
PT (Potential Transformer) – Theory
A Voltage Transformer theory or Potential Transformer theory is just like theory of general purpose step down transformer. Primary of this transformer is connected across the phases or and ground depending upon the requirement. Just like the transformer, used for stepping down purpose, potential transformer i.e. PT has lower turns winding at its secondary. The system voltage is applied across the terminals of primary winding of that transformer, and then proportionate secondary voltage appears across the secondary terminals of the PT.
CT/PT Testing
Below is the list of Major tests conducted on CT & PT
-
Insulation Resistance Test
-
Polarity Test
-
Secondary/Loop Resistance Test
-
Burden Test (optional test)
-
Magnetization Curve Test (optional test)
-
Hysteresis Curve Test
-
Turns Ratio Test (optional test)
-
Primary Injection Test
-
High Voltage Test
