Automatic Supervision; Plc (Programmable Logic Controller) Function; Basic Concept Of Supervision - Toshiba GRE110 Instruction Manual

Settings
The setting elements necessary for binary output relays and their setting ranges are as follows:
Element Range
[RESET] Ins / Dl / Dw /Lat
TBO 0.00 – 10.00s

3.2.4 PLC (Programmable Logic Controller) Function

GRE110 is provided with a PLC function which enables user-configurable sequence logic based
upon binary signals. The sequence logic with timers, flip-flops, AND, OR, XOR, NOT logic, etc.
can be produced by using the PC software "PLC tool" and linked to signals corresponding to relay
elements or binary circuits.
Configurable binary inputs and the initiation of fault and disturbance records can be programmed
using the PLC function. Temporary signals are provided for complicated logic or for using a
user-configured signal in many logic sequences.
PLC logic is assigned to protection signals by using the PLC tool. For details of the PLC tool, refer
to the PLC tool instruction manual. (see 6F2S0810 Instruction manual – PLC TOOL)

3.3 Automatic Supervision

3.3.1 Basic Concept of Supervision

Though the protection system is in a non-operating state under normal conditions, it waits for a
power system fault to occur at any time, and must operate for the fault without fail. Therefore, the
automatic supervision function, which checks the health of the protection system during normal
operation, plays an important role. The GRE110 implements an automatic supervision function,
based on the following concepts:
• The supervising function should not affect the protection performance.
• Perform supervision with no omissions wherever possible.
• When a failure occurs, the user should be able to easily identify the location of the failure.
• Under relay failure detection , CB open control is enabled, but CB close control is disabled.
Step Default
See Appendix C
0.01s See Appendix C
Figure 3.2.4.1 Sample Screen for PLC Tool
 69 
6 F 2 T 0 1 7 2
Remarks
Output relay reset time. Instantaneous,
delayed, dwell or latched.