ABB RELION 620 Series Technical Manual page 547

1MAC504801-IB E
5.3.2
5.3.3
5.3.4
620 series ANSI
Technical Manual
Function block
A071286-ANSI V2 EN
Figure 259: Function block
Functionality
The master trip function 86/94 is intended to be used as a trip command collector and
handler after the protection functions. The features of this function influence the trip
signal behavior of the circuit breaker. The user can set the minimum trip pulse length when
the non-latched mode is selected. It is also possible to select the latched or lockout mode
for the trip signal.
Operation principle
The function can be enabled and disabled with the Operation setting. The corresponding
parameter values are "Enable" and "Disable".
When the 86/94 function is disabled, all trip outputs which are intended to
go through the function to the circuit breaker trip coil are blocked!
The operation of the tripping logic function can be described with a module diagram. All
the modules in the diagram are explained in the next sections.
A070882-ANSI V2 EN
Figure 260: Functional module diagram
Timer
The duration of a trip output signal from 86/94 can be adjusted with the Trip pulse time
setting when the "Non-latched" operation mode is used. The pulse length should be long
enough to secure the opening of the breaker. For three-pole tripping, 86/94 has a single
Protection-related functions
Section 5
541