Basler | BE1-87G | BE1-87G Percentage-Differential Relay Washington State University

BE1-87G
Percentage-Differential Relay
Washington State University
Hands-On Relay School
www.basler.com
Differential Protection
BE1-87G
1-∅ Generator Application
Stabilizing Reactor
BE1-87G
Style Chart
Page 1-4
BE1-87G
Input Ratings
Page 1-4
Current-Sensing Inputs
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Range 1: 5-A nominal; 10 A contin; 250 A for 1 s
Range 2: 1-A nominal; 2 A contin; 50 A for 1 s
Burden: < 0.05 Ω per input
Frequency: 45–65 Hz
Stabilizing Reactor
• Range 1: 65 A for 1 s (70°C)
• Range 2: 13 A for 1 s (70°C)
BE1-87G
Sensing-Range 1
Page 1-5
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Minimum Differential (Operate) Current
0.1, 0.15, 0.2, 0.4, 0.5, 0.8, 1.6 A
Accuracy
For IR ≤ 4 A: ±5% of operate pickup or ±25 mA
(whichever is greater)
For IR > 6 A (20 A max.): ±8% of operate pickup or
±150 mA (whichever is greater)
Dropout
> 90% of operate characteristic
Timing
< 30 ms at 10 times pickup setting; 70 ms maximum
BE1-87G
Sensing-Range 2
Page 1-5
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Minimum Differential (Operate) Current
0.02, 0.03, 0.04, 0.08, 0.10, 0.16, 0.32 A
Accuracy
For IR ≤ 0.8 A: ±5% of operate pickup or ±25 mA
(whichever is greater)
For IR > 1.2 A (4 A max): ±8% of operate pickup or
±150 mA (whichever is greater)
Dropout
> 90% of operate characteristic
Timing
< 30 ms at 10 times pickup setting; 70 ms maximum
BE1-87G
Contact-Outputs Ratings
Page 1-3
• Resistive Ratings
› 120 Vac: Make, break, and carry 7 Aac continuous
› 250 Vdc: Make and carry 30 Adc for 0.2 s,
carry 7 Adc continuous, and break 0.3 Adc
› 500 Vdc: Make and carry 15 Adc for 0.2 s,
carry 7 Adc continuous, and break 0.3 Adc
• Inductive Ratings
› 120 Vac, 125 Vdc, 250 Vdc:
Break 0.3 A (L/R = 0.04)
(L/R of 0.04 is about 15.1 X/R at 60 Hz ,inductive)
BE1-87G
Two Types of Targets
Page 1-6
Internally operated or current operated targets
Internally operated–electronically latching
• Manual-reset targets indicate that a setpoint
contact has energized.
• Select internally operated targets if the relay has
normally closed output contacts.
Current-operated
• Require a minimum trip circuit current of 200 mA
› Continuous rating of 3 amperes
› Two-minute rating of 7 amperes
› One-second rating of 30 amperes
BE1-87G
Power-Supply Options
Page 1-5
Wide-range, isolated, low-burden, switching
Input power (source voltage) is NOT polarity sensitive
Type
K (midrange)
J (midrange)
L (low range)
Y (midrange)
Z (high range
Input Voltage
Nominal
Range
48 Vdc
24 to 150 Vdc
125 Vdc
25 to 150 Vdc
120 Vac
90 to 132 Vac
24 Vdc
12 to 32 Vdc*
48 Vdc
24 to 150 Vdc
125 Vdc
25 to 150 Vdc
250 Vdc
68 to 280 Vdc
240 Vac
90 to 270 Vac
Burden
(Nominal)
3.8 W
4.0 W
17.1 VA
3.9 W
3.8 W
4.0 W
4.1 W
28.4 VA
*Type L begins operation at 14 Vdc;
Once operating, voltage can be reduced to 12 Vdc
BE1-87G
Front-Panel Controls
Page 2-1
BE1-87G
Stabilizing Reactor
Pg 3-2
BE1-87G
Operate / Restraint
Characteristic
Pg 5-4
BE1-87G
DC Connections
Pg 4-19
BE1-87G
AC Connections
Pg 4-20
BE1-87G
Internal Connections
Pg 4-12
BE1-87G
Single-Phase Bypass
Pg 5-1
NOTE
Input reactance might
be too great for solidstate test sets at large
operate currents
Bypass the internal
stabilizing reactor by
placing jumper across
terminals in Figure 5-1
BE1-87G
Single-Phase Testing
Pg 5-2
Follow test routine in the instruction manual, at page 5-2
BE1-87G
External Wiring
Pg 1-2
BE1-87G
Three-Phase
Internal Connections
Pg 4-15
BE1-87G
Three-Phase Testing
Sense 1–10
I1 (At) 9–8 ∠0°
I2 (Bt) 15–14 ∠240°
I3 (Ct) 19–18 ∠120°
I4 (An) 6–8 ∠180°
I5 (Bn) 12–14 ∠60°
I6 (Cn) 16–18 ∠300°
DC
3(+)–4(–)
Mimics field wiring and
normal current flow
BE1-87G
Testing Differential:
Method 1
Set selector switch to D
Apply 0.1 amps to terminals 9-6
Ramp up current to terminals 8-6
Relay should pick up around 0.4 amps
BE1-87G
Testing Differential:
Method 2
Set selector switch to D
Apply 1.0 amps to terminals 9-8 at 1800
Apply 1.0 amps to terminals 6-8 at 00 and
ramp up
Relay should pick up at around 1.4 amps –
a difference of 0.4 amps
Emulates current flow through generator
increasing on neutral side and not on
terminal side
BE1-87G
Investigate!
Try changing angles (if you can)–does relay
respond differently at 300, 900, 1800, etc.?
Is there a maximum torque angle?
Ramp up, ramp down–where does relay drop out?
(Should drop out above 90%)
Start at larger current, 5 or 10 amps, and ramp up
one
Does relay respond differently if fed from one side,
or both?
If miss-wired, what can happen? (What if field
wiring is like method 1?)
BE1-87G
Questions?
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