General, Factory settings, Installation – Basler Electric BE1-50/51B-231 User Manual
Page 31: Application coordination, Section 4 • installation -1, General -1, Factory settings -1, Installation -1, Application coordination -1
9252000895 Rev C
BE1-50/51B-231 Installation
4-1
SECTION 4 • INSTALLATION
General
When not shipped as part of a control or switchgear panel, the relays are shipped in sturdy cartons to
prevent damage during transit. Immediately upon receipt of a relay, check the model and part number
against the requisition and packing list to see that they agree. Visually inspect the relay for damage that
may have occurred during shipment. If there is evidence of damage, immediately file a claim with the
carrier and notify the Regional Sales Office, or contact the Sales Representative at Basler Electric,
Highland, Illinois.
Proper operation of the relay may be confirmed by performing the operational test procedure of Section 5.
If the relay won't be installed immediately, store the relay in its original shipping carton in a moisture and
dust-free environment.
Factory Settings
Factory settings for the internal switches of SW3 are as follows:
•
SW3-1 — OFF (0.0 additional fixed delay for the instantaneous element).
•
SW3-2 — OFF (0.0 additional fixed delay for the instantaneous element).
•
SW3-3 — ON (General Electric, IAC type characteristic curves).
•
SW3-4 — ON (Integrating reset characteristics).
Installation
Select the desired relay settings before putting the relay into service. Changing pickup current settings
while the relay is in service may cause tripping. Perform the following procedures to install the BE1-
50/51B-231 relay.
•
Select the desired relay settings on your new BE1-50/51B-231 relay.
•
Remove the existing IAC relay.
•
Use the four screws provided and attach the cover adapter to the existing case.
•
Insert the new relay and close the cradle latches locking the relay into the case.
•
Install the new Basler Electric connection plug.
•
To install the cover, position the interlocking bracket at the top of the new Basler Electric cover into
the mating receptacle at the top of the cover adapter plate. Secure the captive fastener at the bottom
of the cover.
Application Coordination
In a typical application coordination scheme, a BE1-50/51B-231 is being used to provide primary
protection for a radial distribution feeder. An electromechanical overcurrent relay with extremely inverse
timing provides protection for the transformer and bus. To improve coordination with the
electromechanical relay, the BE1 relay with integrating reset characteristic has the time characteristic
curve E (extremely inverse) selected (SW3-3 set to OFF) and the TIME DIAL set to 2.0. The feeder
reclosing relay is set for two reclose attempts at 3 and 15 seconds after the initial trip. If a permanent fault
occurs (magnitude ten times pickup), calculate the feeder breaker trip time for each of the three
operations. Refer to Section 1 for characteristic curve constants.
From the time characteristic curve equation.
K
BD
C
M
AD
T
N
Trip
+
+
−
=
(
)
028
0
2
02758
.
0
1
10
2
7624
7
0938
2
.
.
.
+
×
+
−
×
=
028
0
05516
.
0
1
10806
124
5248
15
.
.
.
+
+
−
=
seconds
0.209
=