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Overcurrent Elements

Page 2 of 7

20120723

Step 1

SEL

ERATOR

QuickSet, select

Group 1 > Set 1 > Winding 1 Elements

Figure 1 Phase Time-Overcurrent Element Settings

Step 2

Determine the

Winding 1 Max Phase Time Overcurrent Trip Level

setting.

51P1P = ________________

The transformer maximum expected load equals

MVA •1000

kV • 3

Set the 51P1 pickup to 150 percent of expected maximum load.

Step 3

Select

Group 1 > Set 1 > Neutral 2 Elements

Figure 2 Neutral Instantaneous Overcurrent Element Settings

Содержание SEL-387A

Страница 1: ...instantaneous or definite time elements are available for overcurrent protection breaker failure protection overcurrent phase selection for targeting transformer backup protection and so on Two levels...

Страница 2: ...Element Settings Step 2 Determine the Winding 1 Max Phase Time Overcurrent Trip Level setting 51P1P ________________ The transformer maximum expected load equals MVA 1000 kV 3 Set the 51P1 pickup to...

Страница 3: ...5 Verify that the Neutral Inst Overcurrent Trip Delay 50NN1D is set at minimum value of 0 50 Step 6 Select Group 1 Set 1 Winding 2 Elements Figure 3 Phase Time Overcurrent Element Settings Step 7 Det...

Страница 4: ...default values 51P2RS Y 51P2TC 1 Step 11 Save your settings and then send them to the relay Hands On Activity 2 Validate Overcurrent Elements In this hands on activity you will validate the phase and...

Страница 5: ...le Relay Word bit asserts Step 1 Reset relay targets by pushing the TARGET RESET pushbutton located on the relay front panel Step 2 Clear the Sequential Events Recorder SER entries You can perform thi...

Страница 6: ...minals to simulate faults as indicated in Table 1 Step 1 Calculate the expected operate time using the equations from Figure 5 and record your answers in Table 2 Figure 5 Time Overcurrent Operation Eq...

Страница 7: ...rt command or the ACSELERATOR QuickSet HMI Step 3 After the instructor applies the fault current use the TARn serial port command n the Relay Word bit for the element under test or the ACSELERATOR Qui...