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ABB Distribution Protection Unit 1500R
Logical Inputs
In the programmable input table in WinECP, the leftmost column lists the Logical Inputs to the relay. Logical Inputs are
the protective functions in the relay that can be enabled or disabled via "input mapping". When a Logical Input is true, the
function is enabled. When the logic to the Logical Input is false, the function is disabled. A simple example of how logical
inputs work is shown below.
Programming Examples
External Overcurrent Control
1.
In this example, the first level of instantaneous 50-1 (I>>1)
is enabled ONLY when IN1 is HIGH (has a + voltage) AND
IN2 is LOW (no voltage). The Boolean Logic is I1 * I2 = 50-1.
Also, the 46 (Insc>) function is enabled only when IN1 is
HIGH.
52a and 52b
2.
In some appplications it is desirable to combine
the 52a and the 52b contacts for circuit breaker
position indication. This approach is less secure
than using separate inputs for the 52a and 52b, but
it saves one input for other uses. The following
programming example shows how the 52b can be
derived from the NOT of 52a. Connect a 52a contact
from the breaker to I1.
Recloser Control
3.
The following example shows how to change Setting Groups at the same time the recloser is disabled.
Figure 6-7. ALT1 Settings and 43A Recloser Disable Control Logic
6-14
website:www.abb.com/papd
Figure 6-5. Programmable Inputs Screen
Figure 6-6. 52a and 52b Combined Input Example
Programmable Input and Output Contacts
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