Backup Generation System Report.pdf
PDF 517 KB Posted
- Attached to
- Generator Replacement Services Federal contract opportunity
- Solicitation number
- 20342325Q00014
About this file
This document is a Report on Backup Generation System for the Armed Forces Retirement Home in Gulfport, Mississippi, prepared by Hood EE Consulting, PLLC on July 23, 2012. The report details an investigation into why two Kohler 2250 kW, 13.8 kV diesel engine generator sets tripped at approximately 43% of generator load. The investigation revealed several critical issues, including incorrect current transformer (CT) polarity in the generator compartment, improper relay settings, and potential grounding problems with the generators.
Key findings include improperly wired differential CTs causing relay malfunctions, relay settings that deviated from manufacturer recommendations, and a lack of secure ground connections for Generator 2's neutral. The report recommends several corrective actions: inserting differential relay word bits into trip equations, performing a comprehensive system power study, testing relays, ensuring proper overcurrent device coordination, installing a real-time automation controller, resolving generator grounding issues, and implementing safety grounding and lightning protection measures. These recommendations aim to improve the reliability and protection of the backup generation system at the facility.
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Text version
Table Of Contents
Device Information Report Generated: July 23 2012 03:55:54 pm To Device Generator 1_ 7_21_12 as found From Device Generator 1_ 7_21_12 as left
Hidden Settings Changed Settings UnChanged Settings Missing Settings Invalid Settings
7/23/2012file://C:\Documents and Settings\Danny Hood\Application Data\SEL\AcSELerator\QuickS...
Global Top
Compared Settings
Setting
Current Value (Generator 1_ 7_21_12 as found)
Compared Value (Generator 1_ 7_21_12 as left)
LER 15 60
SS1 0 1
Settings that could not be compared
Setting Generator 1_ 7_21_12 as found
Generator 1_ 7_21_12 as left
Group 1 Top
Current Value (Generator 1_ 7_21_12 as found)
Compared Value (Generator 1_ 7_21_12 as left)
25ANG1 20 15
25ANG2 20 15
32P1P -0.0500 -0.1000
32P2P -0.1000 OFF
40XD1 -1.8 -2.0
40XD2 -1.8 -2.0
40Z1P 21.5 21.4 40Z2P 33.6 40.7 E32 N Y E81 2 N E87 T G O87P 0.20 0.30
SLP2 60 100
TAPD 2.97 3.10
Settings that could not be compared
Setting Generator 1_ 7_21_12 as found
Generator 1_
Group 2 Top
No changes
Port 1 Top
Port 2 Top
Port 3 Top
Port F Top
Current Value (Generator 1_ 7_21_12 as found)
Compared Value (Generator 1_ 7_21_12 as left)
SPEED 2400 19200
Settings that could not be compared
Setting Generator 1_ 7_21_12 as found
Generator 1_
SER Top
Report Generated: July 23 2012 04:07:41 pm To Device Generator 2_ 7_21_12 as found From Device Generator 2_ 7_21_12 as left
Hidden Settings Changed Settings UnChanged Settings Missing Settings Invalid Settings
Current Value (Generator 2_ 7_21_12 as found)
Compared Value (Generator 2_ 7_21_12 as left)
LER 15 60
SS1 0 1
Settings that could not be compared
Setting Generator 2_ 7_21_12 as found
Generator 2_
Current Value (Generator 2_ 7_21_12 as found)
Compared Value (Generator 2_ 7_21_12 as left)
25ANG1 20 15
25ANG2 20 15
27VSP 16.0 26.0
32P1P -0.0500 -0.1000
32P2P -0.1000 OFF
40XD1 -1.8 -2.0
40XD2 -1.8 -2.0
40Z1P 21.5 21.4 40Z2P 33.6 40.7 E32 N Y E87 T G O87P 0.20 0.30
SLP2 60 100
TAPD 2.97 3.10
Settings that could not be compared
Setting Generator 2_ 7_21_12 as found
Generator 2_
Current Value (Generator 2_ 7_21_12 as found)
Compared Value (Generator 2_ 7_21_12 as left)
SPEED 2400 19200
Settings that could not be compared
Setting Generator 2_ 7_21_12 as found
Generator 2_
Report Generated: July 23 2012 04:23:10 pm To Device Generator 1_ 7_21_12 as found From Device Generator 2_ 7_21_12 as found
Hidden Settings Changed Settings UnChanged Settings Missing Settings Invalid Settings
Current Value (Generator 1_ 7_21_12 as found)
Compared Value (Generator 2_ 7_21_12 as found)
27VSP 26.0 16.0
E81 2 N
Settings that could not be compared
Setting Generator 1_ 7_21_12 as found
Generator 2_ 7_21_12 as found
Report Generated: July 23 2012 04:19:58 pm To Device Generator 1_ 7_21_12 as left From Device Generator 2_ 7_21_12 as left
Hidden Settings Changed Settings UnChanged Settings Missing Settings Invalid Settings
Relay Element Settings 2-65
SEL-300G Instruction Manual Date Code 20100830
LOSS-OF-POTENTIAL (60LOP) PROTECTION
Element Description
Functional Description The SEL-300G provides an easy method to detect loss of relaying potential caused by blown potential fuses or operation of molded case circuit breakers in the potential circuit secondary. The relay declares a loss-of-potential if there is a 10 percent drop in the measured positive-sequence voltage with no corresponding change in positive-, negative-, or zero-sequence currents.
If the condition persists for 60 cycles, it latches in. 60LOP resets when V1 returns to greater than
0.43 • VNOM, and V0 and V2 are both less than 5 V secondary.
Setting Descriptions This function has no settings and is always active.
Relay Word Bits
Relay Word Bit Function Description Typical Applications 60LOP Loss of Relaying Potential Detected Indication, Control
100% STATOR GROUND PROTECTION ELEMENTS
Element Description
Functional Description The SEL-300G provides a two-zone function designed to detect stator winding ground faults on resistance and high-impedance grounded generators. The Zone 1 element, 64G1, uses a fundamental-frequency neutral overvoltage element that is sensitive to faults in the middle and upper portions of the winding. The Zone 2 element, 64G2, uses a third-harmonic voltage differential function to detect faults in the upper and lower portions of the winding. By using the two zones together, the relay provides 100 percent stator ground fault coverage.
Note: Most generators produce enough third-harmonic voltage for proper application of the 64G2 element; however, some generators (e.g., those with 2/3 pitch winding) may not. In those cases the element based on the third-harmonic voltage, such as the 64G2, cannot be used for 100 percent Stator Ground Protection.
When a ground fault occurs high in the winding of a resistance or high-impedance grounded generator, a voltage appears at the generator neutral. The neutral voltage magnitude during the fault is proportional to the fault location within the winding. For instance, if a fault occurs 85 percent up the winding from the neutral point, the neutral voltage is 85 percent of the generator rated line-neutral voltage. The SEL-300G asserts the 64G1 Relay Word bit when neutral voltage is greater than the 64G1P setting.
| TAW AFRH REPORT.pdf |
| Compare - Gen 1 As Found_ Gen 1 As Left |
| Compare - Gen 2 As Found_ Gen 2 As Left |
| Compare - Gen 1 As Found_ Gen 2 As Found |
| Compare - Gen 1 As Left_ Gen 2 As Left |
| 60LOP Description |
File details come from the government source that posted it. Updated .