Frequency Trend Relay

Listing ID #3904682

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Under frequency setting (dfdt)1 Hz Sec to 9.9 H:: Sec at 50 Hz
No. of tripped stageUFTR -51 UFTR-41 UFTR-6 I 4. Two of which have dfdt output One of which have dfdt output 4 No. of dfdt output
Reference frequency5 MHz
AC voltage rating110, 220VAC
Supply Type Manufacturer, Exporter, Supplier
Preferred Buyer Location All over the world

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Product Details

AC voltage rating 110, 220VAC
Operating voltage range 66 to 135 35-to 135 V The relay is blocked below & above this limit
Evaluation period for delivery dfdt stages 26 52 mSunless stated set to 26 mS On
Reset ratio 100% (Digital)
Tripping delay for dfdt stage 5 cs to 9 cs unless stated set to 6 cs on delivery
Auxiliary supplyvoltage From PT 66 to 135 V External 35 to 135 of PT
Reference frequency 5 MHz
Under frequency setting (dfdt) 1 Hz Sec to 9.9 H:: Sec at 50 Hz
Frequency setting range 39.0 to 60.0 Hz in step of 1 Hz
Max reset time under &Overfrequency 50 ms
No. of tripped stageUFTR -51 UFTR-41 UFTR-6 I 4. Two of which have dfdt output One of which have dfdt output 4 No. of dfdt output
Accuracy .03 Hz at 50 Hz

ARMO-UFTR Frequency relays are used-to monitor the frequency of an electrical System. Due to inadvertent splitting of inner connection in power system. Isolated areas of the system may become deficient in the generation and frequency of the same may drop considerably giving rise to emergency conditions. In order to maintain control of system under this low frequency emergency,some form of graded load shedding is needed. ARMO-UFTR relay is used to detect such conditions and initiate load shedding to prevent complete system collapse.

Type UFTR-41 consists of two/three definite time fully independent frequency measuring stage and one df/dt stage.

Type UFTR-51 consists of two/three definite time fully independent frequency measuring stage and one df/dt stage.

Separate Auxiliary relays are provided which get energized after the respective time delays (In case of df/dt the tripping frequency gradient). Tripping indications and reset push button are provided on the front of the relay.

The relays are suitable for any application in industrial plants and to generators where definite time under over frequency protection with df/dt stage is required.

Internal timers are provided for each operating circuits and separate aux relays ensure maximum flexibility of application.

Two terminals are provided for the voltage input to the frequency sensing circuit. The measurement of the frequency is digital for which only the zero-crossing of the system voltage and not its amplitude, are of consequence. The relay is independent of the voltage fluctuations with a wide range. However the system voltage sink below a predetermined value in which the accurate measurement can no longer be expected the under voltage blocking circuit blocks all the outputs

Silent Features

Low burden
Wide operating voltage range
Wide frequency setting range 39.00 to 70.00 Hz
Independently adjustable tripping stages two of which have a rate of change of frequency function.
Consistent accuracy = +-0.03 Hz at 50 Hz
Unaffected by voltage fluctuations
Insensitive to harmonics & Transient
Built in self-test mode
Built in timer .02 to .18 sec.

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Company Details

Since its incorporation in 1983, ARMO Electronics and Electricals (I) has evolved with a sole motive of providing excellent and reliable power conditioning solution. We are continuously expanding our spectrum at global market place with our quality power conditioning products.
Right from the starting, we have been growing remarkably owing to our policy of incorporating the latest technology into manufacturing of our product line. Uninterrupted Power supply (UPS) systems, Battery Chargers, Static Relays, and Servo Stabilizers. With our independent and creative R&D capability and customer-oriented and market-driven strategy, we have started offering Software interface, remote monitoring, redundant systems, etc. In short for all these years ARMO has always been ahead in offering latest technology, best quality, highest engineering standards & ultimate reliability in the products manufactured & supplied.
We are an ISO 9001:2008 accredited company. We already have a wide network of Distributors & Dealers all over the country. They all have sufficient trained manpower with them which ensures best support to our customer. The process of appointing dealers/ distributors in unrepresented areas is on and continuous efforts are made to expand our base on this line.