5-206 N60 NETWORK STABILITY AND SYNCHROPHASOR MEASUREMENT SYSTEM – INSTRUCTION MANUALCONTROL ELEMENTS CHAPTER 5: SETTINGS5Example 2: Breaker trip circuit integrity monitoringIf it is required to monitor the trip circuit continuously, independent of the breaker position (open or closed), a method tomaintain the monitoring current flow through the trip circuit when the breaker is open must be provided (as shown in thefollowing figure). This can be achieved by connecting a suitable resistor (see figure) across the auxiliary contact in the tripcircuit. In this case, it is not required to supervise the monitoring circuit with the breaker position – the BLOCK setting isselected to “Off.” In this case, the settings are as follows (EnerVista example shown).Figure 5-103: Trip circuit example 25.8.9 Digital countersSETTINGS CONTROL ELEMENTS DIGITAL COUNTERS COUNTER 1(8)NOTEThe wiring connection for two examples above is applicable to both form-A contacts with voltage monitoringand solid-state contact with voltage monitoring. COUNTER 1 COUNTER 1FUNCTION: DisabledRange: Disabled, Enabled COUNTER 1 NAME:Counter 1Range: 12 alphanumeric characters COUNTER 1 UNITS: Range: six alphanumeric characters COUNTER 1 PRESET:0Range: –2,147,483,648 to +2,147,483,647Trip coil52aUR-series devicewith form-A contactsI = current monitorV = voltage monitorDC–827074A3.CDRH1aH1bH1cIV DC+BypassresistorRPower supply Resistance Power24 V DC 1000 O 2 W30 V DC 5000 O 2 W48 V DC 10000 O 2 W110 V DC 25000 O 5 W125 V DC 25000 O 5 W250 V DC 50000 O 5 WValues for resistor “R”
