Basler Electric BE1-79M - Manual (Page 25)

9170100990 Rev N BE1-79M Functional Description 3-1
SECTION 3 • FUNCTIONAL DESCRIPTION
General
The BE1-79M Multiple Shot Reclosing Relay is a microprocessor-based device, which responds to the
state of external contacts. In responding, the Relay provides automatic reclosure once the circuit breaker
has opened to de-energize the line. Refer to Section 1 for major factors to consider when establishing a
reclosing philosophy.
Functional Description
The following paragraphs describe the Relay circuit functions illustrated in Figure 3-1.
Contact Sensing
Depending on style, contact-sensing current is obtained either directly from the Multiple Shot Reclosing
Relay or from any power source with a voltage rating the same as the Relay power supply dc input vol-
tage. When the Relay provides the contact sensing current, isolated contact sensing is employed. When
another power source provides the contact sensing current, non-isolated contact sensing is employed.
Relays with a Y type wide range power supply have a field selectable link (J2) on the contact sensing
board to match the nominal power supply input voltage of 48 Vdc or 125 Vdc. Selection must be done at
the time of installation and prior to application of power. This option is factory set for 125 Vdc. Figure 3-2
shows the link set to the 125 Vdc position.
Table 3-1. Function of Sensing Contacts
Contacts Designation Function
Pilot Initiate
(Optional)
(Note ∆1)
PI
Form A contact which, when closed, initiates a pilot reclosing
(Optional) sequence. This contact is also required during the
sequence to initiate each reclose attempt. ∗
Breaker 52b
Form B auxiliary contact of the controlled breaker utilized to
determine the state of the breaker.
Reclose Initiate
(Note ∆2)
RI
Form A contact which, when closed, initiates a normal reclosing
sequence. This contact is also required during the sequence to
initiate the individual time delays and subsequent reclose output
closures. ∗
Instantaneous
Reclose Bypass
IRB
Form A contact which, when closed, cause the instantaneous
reclosure attempt to be bypassed.
Drive to Lockout DTL
Form A contact which, when closed, instantaneously drives the
Multiple Shot Reclosing Relay into lockout.
NOTES:
∗ If the appropriate initiate contact (RI or PI) is not received within the corresponding period, the relay
is forced to the lockout state.
∆1. Input is Reset Inhibit (RES INH) if option 1 is 1.
∆2. Input is Reclose Wait (REC WAIT) if option 1 is 2. Input is Reclose Permissive (RP) if option 1 is 4.