Figure 3.26-4 The function diagram
The time characteristic is according to DT. When the operation timer has reached the value set by
59NA_Op_T, the 59NA_Op output is activated. If the fault disappears before the module operates,
the operation will reset with a time delay of 30ms.
The binary input 59NA_Blk can be used to block the function. The activation of the 59NA_Blk input
deactivates all outputs and resets internal timers. The binary input 59NA_Blk_Str can be used to
block the start signals. The binary input 59NA_Blk_Op can be used to block the operation signals.
3.26.3 59NA Application Scope
59NA check voltage unbalance conditions in power transmission and distribution networks.
Normally, the capacitor units are designed to withstand 110 percent of the nominal voltage
continuously. When an element inside a capacitor bank fails, the remaining healthier elements
experience an increase in voltage across them. If the voltage exceeds the 110 percent value of the
nominal voltage, it can lead to a failure of the healthier elements of the bank and in turn fail the
entire capacitor bank.
3.26.4 59NA Settings
Table 3.26-3 59na settings
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