4-58
Protection and Control
BE1-951
Figure 4-40. 86 Element
CS/CO-101 Command Examples
1.
Read the current status of the virtual control switch.
>CO-101
C
The returned setting indicates that the switch is in the after-close state.
2.
Trip the breaker by closing the trip output of the virtual control switch.
>CS-101=T
101=T SELECTED
>CO-101=T
101=T EXECUTED
Retrieving Virtual Selector Switch Status Information from the Relay
The virtual control switch state (after-trip or after-close) can be determined through the ASCII command
interface by using the RG-STAT (reports general-status) command. See Section 6,
Reporting and Alarm
Functions, General Status Reporting for more information.
HMI screen 2.2.1 provides switch control and also displays the current status of the virtual control switches
(after-trip or after-close). As the previous Example 1 demonstrated, the state of each virtual selector switch
can be determined using the CO-101 command in a read-only mode.
VIRTUAL LOCKOUT PROTECTION
BE1-951 virtual lockout protection consists of two protection
elements: 86 and 186. Each element has three available inputs
that are BESTlogic programmable. The element can be enabled
or disabled using the mode input. In addition to the mode input,
the 86 element also has a trip input, and reset input. All three of
these inputs are BESTlogic programmable. See figure 4-40.
When the trip input is asserted the output of the function
becomes true. When the reset input is asserted the output
becomes false. If for some reason both inputs are asserted at
the same time, the trip input will have priority and drive the
functions output true. The state of the function is stored in non-
volatile memory.
BESTlogic Settings for Virtual Lockout Protection
Logic settings for the 86 function are made using the SL-86 and SL-186 command(Setting Logic- Lockout
element). The command is used to enable or disable the protective element through its mode input. It is
also used to set the input logic to the element. See table 4-43 for logic settings.
Table 4-45. Logic settings for the 86 element.
Mode
Range/Purpose
Default
Mode
0 = disable
1 = enable
0
Trip
Logic expression determines when and how the
element will trip.
0
Reset
Logic expression that determines when and how the
element will be reset
0
