The reverse power protector provides continuous surveillance for ac generators operating in parallel or for boosting mains supplies. On site adjustment of the trip point and time delay ensures accurate protection against ‘motoring’ in the event of engine failure and prevents tripping from surges during synchronizing.
Reverse power protectors provide continuous surveillance of ac generators against motoring. Reverse power relays are used to detect the failure of the prime mover (engine) when active energy (Watts) flows into the generator causing rotation – the set will operate like an electric motor which can cause significant mechanical damage. This relay offers an adjustable reverse power set point between 2% and 20% of nominal power and time delay adjustment range of 0 to 20 seconds.
As soon as the reverse power level increases above the set point limit, the time delay is activated, after which a trip will occur. The time delay prevents the relay from tripping for a predetermined period to prevent nuisance tripping. The products also feature an internal differential (hysteresis) setting of 1% to reduce nuisance tripping if the measured signal is noisy or unstable. These units are powered from the measuring supply.
The protector relay estimates the power level in the system by measuring current and power factor, but does not actually measure the system voltage. When the reverse power level exceeds the set point, the time delay is started. When the time has elapsed, the relay will energize and the red LED will illuminate to indicate the trip condition. The relay will automatically re-set once the power level falls below the set point minus the differential. The LED will extinguish and the relay de-energizes.
The time delay is not active when resetting. The reverse power level will trip as expected at the calibrated point for unity power factor. However, the system power factor does affect the trip point calibration. The relay becomes more sensitive at lagging power factors, as almost all systems exhibit inductance. At leading power factors, this relay is less sensitive.

About Us 

Here at Sembol LTD we sell new, refurbished, surplus and used hardware products. 

All products are subject to availability and passing our QA testing and inspection by our qualified technicians. 

We currently stock over 4,000 items with an MSRP greater than $1 million dollars.

Sembol LTD offers substantial cost savings while receiving quality products. 

Thank you again for visiting Sembol LTD. For any questions please contact us via the Ebay Message System/Contact Seller. 

Terms 

• Sembol LTD ships worldwide and accepts PayPal. 

• All items are priced each. 

• All products are subject to availability and passing our QA testing and inspection by our qualified technicians. 

• For Customer Service please contact us via the Ebay Message System/Contact Seller. 

Coverage

• Pay with PayPal and you are fully protected.

Packaging and Handling 

• Items are safely packaged in custom shipping cartons for protection. 

Turnaround Time 

• Please contact us via the Ebay Message System/Contact Seller if you have any further questions about turnaround time.

Shipping 

• We ship worldwide from Turkey, using PTT, USPS, UPS, FedEx, DHL or other couriers when needed. Let us know if you like to use a shipping service other than the ones listed.

• International Customers are responsible for all Customs fees, import taxes, VAT, and other fees applied by their respective countries.

Return and Warranty Policy 

• 30 days refund, buyer pays return postage.

• Product must be returned in purchased condition.

• If you are dissatisfied with a product from Sembol LTD you may return the product within 30 calendar days of the invoice date. No returns will be accepted 30 days after the invoice date. 

• We do not accept returns of discounted products based on the date manufactured or the cosmetic condition of product or packaging.

• All used products  are repackaged in custom shipping containers. Some used products may not come with manual(s) or other accessories normally supplied when buying factory new. 

• Refunds will be issued only upon receipt and testing. 

Disclaimer 
Sembol LTD sells new, refurbished, surplus and used products also develops channels to purchase such products. 
Sembol LTD is not affiliated with nor an authorized distributor or representative of any manufacturer, brand or product listed. 
Designated trademarks, brand names and brands appearing herein are the property of their respective owners.

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