Testing more complicated elements that use a percentage or ratio between values can be difficult if you cannot properly define all of the values in the equation. It doesn’t help that different people can define the same element using different terms, especially when they don;t define their terms in their
I’m reviewing information for the next book in The Relay Testing Handbook series and came across this Youtube channel. This is a dated, but excellent, video introduction to overcurrent protection (50/51) relays that has some great information to help you understand protective relays. The video reviews the basics of overcurrent protection
I am writing to enquire about 67N test procedures, specifically Schweitzer relays. The Page 94 of the Relay Testing Handbook #C2 : Practical Relay Testing (50/51/67/59/27/81/87/21) by Chris Werstiuk says “some relays, such as SEL models, do not have user defined characteristics and operate dynamically based on actual operating condictions”
Here is a story from one of our Customers at Manta Test Systems: “I had to troubleshoot a Schweitzer SEL-300G relay yesterday that had the (25) Sync-Check element enabled, but wouldn’t assert the close permissive. My customer had had extreme problems synchronizing the 16MW generator on-line. They sometimes had to
A customer was having problems timing a SEL-451 with a delay setting of 8 cycles. He was measuring a 12 cycle delay when transitioning from 59.5 to 58.5 Hz. If you look at the spec sheet, the SEL-451 frequency element has a “Maximum Pickup/Dropout Time: 3.0 cycles”. When you add
Cable: 9-pin to 9-pin RS-232 Straight Through Software: Futura+ Communicator Settings: Default Settings Link: Direct Connection Device Address: 0001 Communications Port: COM1 (Varies by Computer) Baud Rate: 9600 Protocol: EI Protocol Make sure the switch beside the comm port on the meter
Page [tcb_pagination_current_page] of [tcb_pagination_total_pages]