SEL-487E Data Sheet Schweitzer Engineering Laboratories, Inc.
8
provide secure operation during transformer energiza-
tion, while maintaining sensitivity for internal faults.
Waveshape-based inrush detection addresses inrush con-
ditions that contain low second and fourth harmonic con-
tent. For applications without voltage inputs (therefore
no volts/hertz element), use the fifth harmonic monitor-
ing to detect and alarm on over-excitation conditions.
The SEL-487E-5 SV Subscriber can be used in applica-
tions with as many as five three-phase current inputs. For
the application shown in Figure 7, the SEL-487E sub-
scribes to a total of four IEC 61850 9-2 SV streams from
two different merging units. The SV publishers and sub-
scriber for this application are connected through a pro-
cess bus network switch. The same network switch is
being used to communicate GOOSE messages and time-
synchronize the system by using a PTP time source.
Use the negative-sequence differential element for sensi-
tive detection of inter-turn faults within the transformer
winding.
Phase, negative-, and zero-sequence overcurrent ele-
ments provide backup protection. Use breaker failure
protection with subsidence detection to detect breaker
failure and minimize system coordination times.
When voltage inputs are provided to the SEL-487E, volt-
age-based protection elements and frequency tracking
are made available. Frequency tracking from 40.0 to
65.0 Hz over- and undervoltage, and frequency elements,
along with volts/hertz elements provide the SEL-487E
with accurate transformer protection for off-frequency
events and overexcitation conditions.
Use the SEL-487E for complete protection of generator
step-up (GSU) transformer applications. Use built-in
thermal elements for monitoring both generator and
transformer winding temperatures. Apply the volts/hertz
element with two level settings for overexcitation protec-
tion of loaded and unloaded generator operating condi-
tions. Set the directional power elements to detect
forward and reverse power flow conditions for monitor-
ing and protection of the generator step-up (GSU) trans-
former in prime power, standby, base load, and peak
shaving applications.
In the TiDL version of this application, you can connect
the SEL-487E-5 TiDL Relay to two SEL-TMU devices.
as shown in Figure 7.
Figure 7 Wye-Delta Transformer With Grounding Bank (SV)
Substation Yard
Control House
SV Publication
1. IW, VY
w
2. IX, VZ
w
GOOSE Publications
1. 52AA1
IW IX
PTP Time Source
Process Bus
Network
SV Publication
1. IW, VY
w
2. IX, VZ
w
GOOSE Publications
1. 52AA1
GOOSE Publications
1. TRPXFMR, TRIPS, TRIPT, CLS, CLT
IW IX
qq
(REF) (REF)
52 52
HV Bus LV Bus
ST
3
1
3
1
q DC connections for breaker
status and control.
w No physical connection.
Published data do not contain
valid analog measurements.
SV Subscriber
Merging Unit #1
Merging Unit #2
To Next Page
Loading...
