These high-current supply units have two main fields of application. The first is to conduct primary tests on protective relays. A primary test shows whether all parts of the protection system are functioning together properly within the specified time limits under operating conditions. The second field of application involves conducting current tests on low-voltage circuit breakers and overcurrent devices.
APPLICATION EXAMPLE IMPORTANT Read the User’s manual before using the instrument. Primary test of protective relay equipment and low-voltage circuit breaker 1. Connect the CSU600A’s current outputs across the current transformer (diagram A) or to the breaker terminals (diagram B). 2. Connect Timer TM200’s start input to output T and the stop input to the protective relay equipment’s auxiliary contact. 3. Set the current. 4. Execute the test. 5. Read the time from TM200.