Basler Electric DECS-400 - Manual (Page 158)

146 9369700990 Rev R
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Parallel the generator with the bus. ....................................................................................... ________
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Set the machine kilowatts for approximately 25% of machine rating at zero vars. ............... ________
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Check for a phase shift at the DECS-400 between the voltage sensing and current
sensing B-phase inputs. The B-phase current should lag the sensed voltage between
E1 and E3 by 90 degrees. ..................................................................................................... ________
•
If the phase relationship is correct, proceed with testing. If the phase relationship is
incorrect, troubleshoot the system, resolve the problem, and retest as appropriate
before transferring to AVR mode. .......................................................................................... ________
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Verify that AVR is nulled to FCR. .......................................................................................... ________
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Verify that all null status indicators provide the null indication. ............................................. ________
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Verify that AVR Pre-Position mode is disabled or the external pre-position contacts are
open. ...................................................................................................................................... ________
In the following step, be prepared to transfer back to Manual mode if the excitation voltage increases
suddenly.
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Transfer to AVR. .................................................................................................................... ________
OEL Test
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Disable the overexcitation limiter through the Configuration tab of the BESTCOMS
Limiter screen. ....................................................................................................................... ________
•
Set the On-Line, OEL three current limits at 15% above the no-load field current with a
5 second time delay. .............................................................................................................. ________
Using the Analysis screen capabilities of BESTCOMS, prepare to check the OEL response time. If the
response time is too slow, increase OEL gain parameters Ki and Kg and repeat the test.
•
Increase the field excitation until the field current reaches 125% of the no-load field
current setting. ....................................................................................................................... ________
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Enable OEL through the Configuration tab of the BESTCOMS Limiter screen. ................... ________
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Verify that the response time is within specified limits. ......................................................... ________
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Enter the final, operating OEL values. ................................................................................... ________
UEL Test
•
Disable the underexcitation limiter through the Configuration tab of the BESTCOMS
Limiter screen. ....................................................................................................................... ________
•
Set the UEL var limit for 5% vars into the generator. ............................................................ ________
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Adjust the vars into the generator for 15% at 25% load. ....................................................... ________
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Perform a step response into the UEL limit by enabling UEL in BESTCOMS. ..................... ________
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Verify stable performance and speed of response. ............................................................... ________
If the response time is too slow, increase the UEL gain (Ki and Kg) and repeat the test.
•
Verify stable UEL performance by testing the machine from 25% through 100% real
power loading, underexcited. ................................................................................................. ________
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Increase the excitation above the UEL limit. ......................................................................... ________
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Enter the final, operating UEL values. ................................................................................... ________
SCL Test (If Applicable)
•
Disable stator current limiting through the Configuration tab of the BESTCOMS Limiter
screen. ................................................................................................................................... ________
•
Operate the unit at approximately 30% load at 0.8 lagging power factor in Droop mode. .... ________
•
Using BESTCOMS, set the SCL low limit to 5% greater than the metered current. ............. ________
Commissioning DECS-400