Basler Electric BE1-700 - Manual (Page 222)

Figure 8-16. High-Speed Reclose Interlock Logic
Example 1.
Close Expression: SL-VO2=79C*/VO1+101C
Example 2.
Hold Disable Setting: SG-HOLD1=0
Block Load Tap Changer
A block load tap changer output is not provided in any of the preprogrammed logic schemes. However,
one of the output relays can be programmed to operate when the recloser is running (79RNG) and wired
to energize a normally closed auxiliary relay. The 79RNG logic variable is high when any of the timers are
timing and low when the reclosing function is in a lockout or reset state.
Setting Group Selection
The BE1-700 Digital Protective Relay provides two settings groups for adaptive relaying. The
preprogrammed logic schemes barely tap the flexibility that is available. The following two examples
illustrate how the settings groups can be adapted for different conditions and how different setting groups
can be used to vary the system logic.
Example 1. Adapting the relay settings for different conditions
In overcurrent protection systems, the source conditions can have a major impact on sensitivity,
coordination intervals, and clearing times. Generally, the pickup and time dial settings are a compromise
between a normal condition and a worst-case condition. Contact logic from the position of the source
breakers can select which settings group is active. To achieve this, assign input D0 or D1 to a contact
8-40 BE1-700 Application 9376700990 Rev M