ABB Remote I/O RIO600 Installation And Commissioning Manual page 146

Section 6
Commissioning
138
NSPTOC can also be used to detect broken conductors.
The operating time characteristic is according to the definite time (DT).
Operation principle
The Operation setting is used to enable or disable the function. The corresponding
parameter values are "On" and "Off".
The operation of NSPTOC can be described with a module diagram. All the modules
in the diagram are explained in the next sections.
I
2
GUID-8327A6F2-E793-4CC4-A8F7-CBDB4E34DBA7 V1 EN
Figure 79: Functional module diagram
Level detector
The measured negative-sequence current is compared to the set Start Value. If the
measured value exceeds the set Start Value, Level detector activates the Timer
module.
Timer
Once activated, Timer activates the NSPTOC_Start output. When the operation
time has reached the value of Operate Delay Time, the NSPTOC_Oper output is
activated.
Signals
Table 84: NSPTOC Input signals
Name Type
I SIGNAL
2
Table 85: NSPTOC Output signals
Name
NSPTOC_Start
NSPTOC_Oper
Timer
Level
t
detector
Default
0
Type
BOOLEAN
BOOLEAN
1MRS757488 H
NSPTOC_Oper
NSPTOC_Start
Description
Negative phase
sequence current
Description
General start of function
General operate of function
Installation and Commissioning Manual
RIO600