BECKWITH ELECTRIC M-3520, Instruction Book

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–7–
M-3520 Intertie Protection Relay
OPTIONAL FUNCTIONS
Device Setpoint
Number Function Ranges Increment Accuracy †
Phase Distance (dual–zone mho characteristic) Phase Distance (dual–zone mho characteristic)
Phase Distance (dual–zone mho characteristic) Phase Distance (dual–zone mho characteristic)
Phase Distance (dual–zone mho characteristic)
Circle Diameter #1, #2 0.1 to 100.0
Ω
0.1
Ω
& 0.1
Ω
or & 5%
(0.5 to 500.0
Ω
) ( & 0.5
Ω
or & 5%)
Offset #1, #2 –100.0 to 100.0
Ω
0.1
Ω
& 0.1
Ω
or & 5%
(–500.0 to 500.0
Ω
) ( & 0.5
Ω
or & 5%)
Impedance Angle #1, #2 0° to 90° 1° & 1°
Time Delay #1, #2 1 to 8160 Cycles 1 Cycle –1 to +3 Cycles or & 1%
Out of Step (mho characteristic) Out of Step (mho characteristic) Out of Step (mho characteristic) Out of Step (mho characteristic) Out of Step (mho characteristic)
Circle Diameter 0.1 to 100.0
Ω
0.1
Ω
& 0.1
Ω
or 5%
(0.5 to 500.0
Ω
) ( & 0.5
Ω
or 5%)
Offset –100.0 to 100.0
Ω
0.1
Ω
&
0.1
Ω
or 5%
(–500.0 to 500.0
Ω
) ( & 0.5
Ω
or 5%)
Impedance Angle 0° to 90° 1° & 1°
Blinder 0.1 to 50.0
Ω
0.1
Ω
&
0.1
Ω
or 5%
(0.5 to 250.0
Ω
) ( & 0.5
Ω
or 5%)
Time Delay 1 to 8160 Cycles 1 Cycle & 1 Cycle or & 1%
Trip on mho Exit Enable/Disable
Pole Slip Counter 1 to 20 1
Pole Slip Reset 1 to 8160 Cycles 1 Cycle & 1 Cycle or & 1%
Rate of Change of Frequency Rate of Change of Frequency Rate of Change of Frequency Rate of Change of Frequency Rate of Change of Frequency
Pickup #1, #2 0.10 to 20.00 Hz/Sec 0.01 Hz/Sec
&
0.05 Hz/Sec or
&
5%
Time Delay #1, #2 1 to 8160 Cycles 1 Cycle +20 Cycles
Negative Sequence
Voltage Inhibit
0 to 99% 1%
&
0.5%
Nominal Settings Nominal Settings
Nominal Settings Nominal Settings
Nominal Settings
Nominal Voltage 60 to 140 V 1 V —
Nominal Current 0.5 to 6.00 A 0.01 A —
VT Configuration Line-Line
Line-Ground
Line-Ground to Line-Line*
Seal-In Delay 2 to 8160 Cycles 1 Cycle –1 to +3 Cycles or & 1%
*When line-ground to line-line is selected, the relay internally calculates the line-line voltage from the
line-ground voltages for all voltage-sensitive functions. This line-ground to line-line selection should only
be used to a VT nominal secondary voltage of 69 V (not 120 V).
78
† Select the greater of these accuracy values. Values in parentheses apply to 1 Amp CT secondary rating.
21
81R