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67-TOC Relay
Element With ANSI
Curves
Manual Close Mode
7SJ63 Manual
C53000-G1140-C120-1
The pickup of the 67-TOC element is set at address 72& 3,&.83. As is the
case for the 67-1 relay element, the pickup value of the 67-TOC relay element should
be set above the maximum anticipated load current. Pickup due to overload should
never occur since the 67-TOC relay element is designed only for fault protection. For
this reason, a setting equal to 120 % of the expected peak load is recommended for
line protection, and a setting equal to 140 % of the expected peak load is recommend-
ed for transformers and motors.
The 67-TOC element time multiplication factor is set at address 7,0(
',$/ and should be based on system coordination requirements.
The time multiplication factor may be set to ∞. The 67-TOC element will then pickup
and generate a message, but will never trip. If the 67-TOC element is not required at
all, address should set to 'HILQLWH 7LPH RQO\ during protective function
configuration (see Section 5.1).
Pickup of the 67-TOC relay element will occur for currents greater than or equal to
110 % of the 67-TOC element's pickup value, and may or may not occur for currents
between 100 % and 110 % of the 67-TOC element's pickup value. Dropout of the 67-
TOC relay element occurs when the current decreases to 95 % of the 67-TOC ele-
ment's pickup value. If 'LVN (PXODWLRQ is selected at address 72&
'URSRXW, then reset occurs according to the reset curve as described in Subsection
6.3.1.2.
The pickup of the 67-TOC element is set at address 72& 3,&.83. As is
the case for the 67-1 relay element, the pickup value of the 67-TOC relay element
should be set above the maximum anticipated load current. Pickup due to overload
should never occur since the 67-TOC relay element is designed only for fault protec-
tion. For this reason, a setting equal to 120 % of the expected peak load is recom-
mended for line protection, and a setting equal to 140 % of the expected peak load is
recommended for transformers and motors.
The corresponding time dial is set at address 7,0( ',$/ and should be
based on system coordination requirements.
The time dial may be set to ∞. The 67-TOC element will then pickup and generate a
message, but will never trip. If the 67-TOC element is not required at all, address
should set to 'HILQLWH 7LPH 2QO\ during protective function configuration (see
Section 5.1).
When a circuit breaker is closed into a faulted line, a high speed trip by the circuit
breaker is often desired. The manual closing feature is designed to remove the delay
from one of the directional overcurrent elements when a circuit breaker is manually
closed into a fault. The time delay may be bypassed via an impulse from the external
control switch, thus resulting in high speed tripping. This impuls is prolonged by a pe-
riod of 300 ms. Address 0$18$/&/26(02'( can be set such that the delay is
defeated for the 67-2 element, the 67-1 element, the 67-TOC element, or none of the
elements (,QDFWLYH). Defeating the delay on just one of the three elements allows
control over what level of fault current is required to initiate high speed tripping of a
circuit breaker that is closed into a fault.
If the manual closing signal is not from a 7SJ63, that is, neither via the built-in operator
interface nor via a series interface, but, rather, directly from a control acknowledgment
switch, this signal must be passed to a 7SJ63 binary input, and configured accordingly
so that the element selected for high speed tripping will be effective.
Functions
6-51
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