SFR


 

 

 

SFR - Frequency Relay Specifications and Order Information

The basic types of SFR-2 relays
Type Description
59-1A,2A,3A
These models, for 1,2, or 3 independent trip settings, respectively, trip at underfrequency settings with adjustable delay of up to 79 cycles, can directly trip breakers. Settable seal-in coil holds trip signal until the breaker auxiliary contact opens the trip circuit.
61-1A, 2A, 3A Similar to 59-1A, 3A except for overfrequency applications.
60-2A Similar to 59-2A except for under/over frequency applications.
59-2C

Single underfrequency setpoint with reclose. Trips at one preset underfrequency with a time delay of up to 79. Settable seal-in coil holds trip signal until the breaker auxiliary contact opens the trip circuit.

An independent reclosure contact is provided for direct reclosing of circuit breakers. This contact is initiated after trip has occurred and system frequency has recovered above a preset level. Reclose delay setting adjustable from 0.3 to 600 seconds ±5%.
Other configurations available including relay status alarm, long trip delay, and pre-trip alarm.
Frequency Accuracy ±.007 Hz on 60 Hz base
Time Delay Accuracy ± cycle
Surge Withstand The SWC test wave is an oscillatory wave with a nominal frequency of 1.5 MHz.(1.0
to 1.5 MHz range), 2.5 kV (-0+20%) crest value of the first half cycle peak, envelope
decaying to 50 % of the crest value of the first peak in 6 microseconds from the start
of the wave. Source impedance of the surge generator used to produce the test wave
is to be 150 ohms. The test wave to be applied to a test specimen at a repetitive rate
of not less than 50 tests per second for a period of at least 2.0 seconds.
The test wave is applied between all inputs and the case; between all inputs and the
case; between each input and all other inputs. This is a differential and a common
mode test. Each test is applied consecutively for two seconds. The relay must not
falsely operate at four digital cycles delay.
Signal Loss Test The relay will not falsely operate at four digital cycles delay when the signal is removed,
regardless of the rate.
Power Loss Test

The relay will not falsely operate at four digital cycles delay when the signal is removed,
regardless of the rate.
Signal Undervoltage Adjustment 40 to 70 Vrms (dc powered versions)
60 to 70 Vrms (ac powered versions)
Target *2A Tap - 2A must operate; 200 mA must release.
*0.2 A Tap - 0.2 A must operate; 20 mA must release
Output Contacts Refer to the following table
Parameters
Amperes ac or dc
(155 Vdc max.)
Holding Coil Tap .2 A 2 A
Carry for 1 Second 10 A 30 A
Carry - Continuous 2 A 6 A
Resistance 1.3 A .20
Impedance at 60 Hz 1.45 .20
Break (Controlled by release of Holding Coil) 0.2 A 2 A
Frequency Range UF - 55.0 to 59.98 Hz OF - 60.00 to 64.00 Hz
Frequency Setting Resolution to .02 Hz of desired setting
Time Delay Resolution 1 Cycle (after 32 msecs, internal analog delay)
Temperature 0 to 140° F
Humidity 0 to 95% Non-condensing
Isolation Will withstand a one minute application of 1500 Vrms, 60 Hz between each input
and any other input or any input and case.
Power Supplies All relays (dc or ac) include complete isolation of logic from the power source.
Environment All relays are 100% tested at high and low temperature.
Weight 12 lbs
Signal Burden - dc powered units 3 VA max
Burden - ac powered units 18 VA max
Power Requirements 125 Vdc nominal - 0.1 A, 48 Vdc nominal - 0.2 A,
117 Vac nominal - 0.1 A, or 250 Vdc nominal - 0.6 A
Part No.

Model
Application
Type
Input Power
707D501
2/59
UF
1A
48 Vdc
707D502
2/59
UF
1A
125 Vdc
707D503
2/59
UF
1A
117 Vdc
707D504
2/59
UF
2A
48 Vdc
707D505
2/59
UF
2A
125 Vdc
707D506
2/59
UF
2A
117 Vdc
707D507
2/59
UF
3A
48 Vdc
707D508
2/59
UF
3A
125 Vdc
707D509
2/59
UF
3A
117 Vdc
707D523
2/59
UF
2C
48 Vdc
707D524
2/59
UF
2C
125 Vdc
707D525
2/59
UF
2C
117 Vdc
707D548
2/59
UF
12A
125 Vdc
707D549
2/59
UF
12A
48 Vdc
707D542
2/59
UF
22A
125 / 48 Vdc
 
707D514
2/61
OF
1A
48 Vdc
707D515
2/61
OF
1A
125 Vdc
707D516
2/61
OF
1A
117 Vdc
707D520
2/61
OF
3A
48 Vdc
707D521
2/61
OF
3A
125 Vdc
707D522
2/61
OF
3A
117 Vdc
 
707D517
2/60
UF/OF
2A
48 Vdc
707D518
2/60
UF/OF
2A
125 Vdc
707D519
2/60
UF/OF
2A
117 Vdc
Relay Status Alarm Series
707D611
2/59
UF
2S
125 Vdc
707D612
2/59
UF
2S
250 Vdc
707D614
2/59
UF
22S
125 Vdc
707D617
2/59
UF
ICS
48/125 Vdc
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