53 of 124  Construction of Giresun Wastewater Treatment Plant  Tender Dossier Volume 3 Employer’s Requirements  Section 08: Electrical Works  Every arrester shall have an alarm contact to open if the arrester becomes defective. The alarm contact shall be  wired to the PLC.  All necessary compensation systems shall be provided and installed so that power factor of the plant would be  1.  Furthermore; no load loss of the transformers shall be compensated via fixed capacitor banks.  Necessary measures shall be taken in order to suppress harmonics if required. Harmonic filters for Fk and shunt  reactor and tyristor control for fk shall be applied.  Automated power factor gear for correcting power factor shall be incorporated. Fixed capacitor banks are not  permitted. All required gear for power factor correction shall be supplied as one unit fully enclosed to a degree of IP54.  The unit shall comply with  EN 61439  and be designed to maintain: cos    = 1± %3 at all load conditions.  On the front of the unit the following instruments are to be found:  8.10 Power Factor Correction  • Power factor [0-1-0].  • Step indicator (to indicate the current step).  • Indicating lamps:  - Alarm  - Normal operation  • EN 60891.  • IEC 60831, Shunt power capacitors of the self-healing type. • Capacitor; should be 480 V and also able to be use with shunt power reactor  • Shunt power harmonic reactor, well be edit if requirement, Tip %5,67 /215 Hz, • There should be block for early shut down and reducing resistors which limits current value during  closure as max 60 In in contactors. Contactors should be contactor which is produced for compensation.  Contactors should be selected accordingly with relevant IEC 60831-1 / 60871-1 and EU standards.  • Shunt power reactor , Tristor controlled, last 3 step,  The alarm signal shall be wired to the PLC.  Capacitors shall be minimum 520 Volt PCB-free, with a loss < 0.2 W/kVAr and comply with:  Power factor correction units shall incorporate suitably rated internal overcurrent protection of the capacitors  and be with common phase sensing for correction of all three phases simultaneously. Single-phase correction is  not required. Delay between corrections shall be adjustable from 30 - 120 seconds and be set to suit the  requirement of the local electricity authority. If no requirements, 40 sec shall be used as the default setting. Twelve step capacitor bank shall be provided as a minimum. Each step to be suitable sized with due regard to  the inductive loads.  Terminal boxes for motors are to be with bottom cable entry through cable glands.  8_Vol3_d4 3_Section 8 electrical works_en_GIR rev6.doc  8.11 Motor Installations 