RING-BACKUP 1264040 - Caterpillar

Electric Power Generation:
3512 GEN SET (S/N: ZAF1-UP)
3512B GENSET (S/N: ZAH1-UP; ZAJ1-UP)
3516B GEN SET (S/N: ZAP1-UP)
3516C GEN SET (S/N: SBK1-UP)
C175-16 GEN SET (S/N: WYB1-UP)
Engine:
3512 (S/N: YAK1-UP; YAX1-UP)
3512B (S/N: YAM1-UP; YAN1-UP; YAY1-UP; YAZ1-UP)
3512C (S/N: SBG1-UP)
3516 (S/N: YAL1-UP; ZAL1-UP; ZBL1-UP; YAS1-UP; YBS1-UP; JCW1-UP)
3516B (S/N: JDE1-UP; YAP1-UP; ZBP1-UP; PBR1-UP; PDR1-UP; YAR1-UP; ZAR1-UP; ZBR1-UP; YAT1-UP; YBT1-UP; YAW1-UP; YBW1-UP; JCY1-UP)
3516C (S/N: SKC1-UP; JDH1-UP; N1H1-UP; JDJ1-UP; SBJ1-UP; SCJ1-UP; SFJ1-UP; SCK1-UP; SEK1-UP; SFK1-UP)
C175-16 (S/N: WYC1-UP)
C175-20 (S/N: BXR1-UP)
G3508 SI TA (S/N: CPJ1-UP; CPS1-UP; CPY1-UP)
G3512 SI TA (S/N: CRN1-UP; CSP1-UP)
G3512E (S/N: SSR1-UP; NGS1-UP)
G3516 (S/N: L6A1-UP; ZBA1-UP; L6E1-UP; L6F1-UP; L6G1-UP; 4EK1-UP; ZAZ1-UP)
G3516B (S/N: ZBB1-UP; ZBC1-UP; L6H1-UP; L6J1-UP)
G3516C (S/N: GSB1-UP; GZC1-UP; F6D1-UP; F6E1-UP; F6F1-UP; GZZ1-UP)
G3516E (S/N: F6G1-UP; GAS1-UP)
G3520C (S/N: GZA1-UP; GZB1-UP; GZJ1-UP; GZL1-UP; GZM1-UP; GZN1-UP; RLP1-UP; LGS1-UP)
G3520E (S/N: GZE1-UP)
Generator Set:
C27 GEN SET (S/N: N1B1-UP)
C32 GEN SET (S/N: JSJ1-UP)
CG170-16 (S/N: GLM1-UP; GLN1-UP)
Power Module:
C32 POWER MODUL (S/N: KNM1-UP)
PM3512 (S/N: BRF1-UP)
PM3516 (S/N: BPD1-UP; NAM1-UP; KEN1-UP; NBR1-UP)
PMG3516 TA DI (S/N: CFD1-UP)
PMG3516 (S/N: KAD1-UP; JKK1-UP)
ReferenceSpecial Instruction, SEHS9124, "Cleaning and Drying of the Generator"ReferenceApplication and Installation Guide, LEBW7543, "Generator Paralleling Switchgear"ReferenceANSI/IEEE Standard C37.2 (Protective Relay Functions)Introduction
Generator winding component failures can be traced back to various causes, including harsh environment, application abuse, installation deficiencies, and factory quality defects.Effective generator maintenance practices and protective relaying are a necessity to preventing insulation weakening, mitigating extent of damage, minimizing downtime, and determining root cause of generator component damage caused by an electrical fault.Effective Generator Winding Maintenance Practices
Following these simple requirements will help to insure the greatest life of generator windings.
Check and record winding insulation strength at the time of commissioning, periodically thereafter, and monitor trends.
Use space heaters when the generator is not in operation.
Monitor operating stator temperature and trend.
Clean generator windings periodically.Note: Refer to the above mentioned Special Instruction media for more details on proper stator maintenance practices.Effective Protective Relaying Practices
Consideration of the following in generator protective relaying will help as a guide to provide a safe environment for generator windings.
Basic factory protective relay settings are required to be adjusted at commissioning to meet application requirements, to ensure the most effective level of protection. Complex applications require a coordination study. It is important that a coordination study provides settings to protect the generator as well as the load.
Due to the greater presence of destructive energy on the bus being fed by the generator, many applications, including paralleling applications, require a higher level of protective relaying than the basic factory protective relay functions provided in standard generator set controls.
Avoidance of protective relaying nuisance tripping requires careful consideration by experts in the industry to implement settings while still providing effective generator protection.
The protective functions of greatest interest for utility companies are over-voltage, under-voltage, over-frequency, and under-frequency.
The priority reason for these functions is to protect the utility from generator disturbances.
Generator rotor and excitation components integrity benefit from protective functions reverse var and phase sequence.
Other devices such as voltage regulators and varistors on the rectifier assembly are also effective at mitigating rotor and excitation component failures.
Generator stator integrity benefit from protective functions ground fault, 100% Stator Ground Protection by Injection, phase differential, phase