Download instruction manual for transformer differential

DIELECTRIC TEST
In accordance with IEC 255-5 and ANSI/IEEE C37.90-1989, one minute dielectric (high potential) tests
may be performed as follows.
All circuits to ground: 2121 Vdc
Input to output circuits 1500 Vac or 2121 Vdc
Note that this device employs decoupling capacitors to ground at all the output terminals, and at the
power supply terminals (3, 4). Accordingly, a leakage current of approximately 15 milliamperes per 1000
Vac is to be expected.
CONNECTIONS
Incorrect wiring may result in damage to the relay. Be sure to check the model and Style Number against
the options listed in the Style Number Identification Chart (Figure 1-1) before connecting and energizing a
particular relay.
NOTE
Be sure the relay case is hard-wired to earth ground with no smaller than 12 AWG
copper wire attached to the ground terminal on the rear of the relay case. When the relay
is configured in a system with other protective devices, it is recommended to use a
separate lead to the ground bus from each relay.
Except as noted above, connections should be made with a minimum wire size of 14 AWG. Figures 4-7
through 4-10 show case terminals designations for four typical relay configurations. Figures 4-11 through
4-14 show the internal connections of the BE1-87T. Control circuit connections are shown in Figures 4-15
through 4-18.
CAUTION
To prevent possible false tripping, the upper connection plug should be in place prior to
removing or installing the lower connection plug.
BE1-87T
5
AUX N.O.
7
AUX COM
11
12
6
AUX N.C.
14
8
RESTRAINED
COM
4
13
15
9
COMMON
5
16
10
UNRESTRAINED
19
POWER
SUPPLY
STATUS
CONTACTS
POWER
1
INPUTS
1
3
2
3
4
20
1 CONFIGURATION IS DEPENDENT
ON STYLE SELECTED.
OUTPUTS
1
BE1-87T
D437-001
9-23-94
Figure 4-7. Case Terminals: Single-Phase
9171300990 Rev R
BE1-87T Installation
4-9