Loading... Please wait...

Categories

General Electric STD Percentage Differential with Harmonic Restraint - 12STD15B5A

  • Image 1
  • Image 2
Price:
$0.00
SKU:
12STD15B5A
Weight:
0.00 LBS
Availability:
Stock-1 week
Shipping:
Free Shipping



Product Description

STD Percentage Differential with Harmonic Restraint - The STD is a harmonic restrained percentage differential relay specifically designed for transformer fault protection. The STD15 through 21 relays differ from each other only in the number of restraint circuits that they include (see Selection Guide). The STD25 through 29 relays differ from STD15 through 21 relays in that they utilize only second harmonics for the harmonic restraint circuit while the others use all the harmonics. Harmonic restraint is employed to prevent undesired tripping as a result of exciting current inrush to the transformer being protected. Inrush to a transformer usually occurs when the transformer is energized or when a nearby fault is cleared thus suddenly restoring normal voltage to the bank. The second harmonic component is the predominant harmonic transformer inrush current.

All relays fully tested prior to shipment. Free UPS Ground Shipping in Continental US. Emergency shipment available, please call.

Warranty Information

12 Months

Find Similar Products by Category


Write your own product review

Product Reviews

This product hasn't received any reviews yet. Be the first to review this product!


Add to Wish List

Click the button below to add the General Electric STD Percentage Differential with Harmonic Restraint - 12STD15B5A to your wish list.

You Recently Viewed...