Every arrester shall have an alarm contact to open if the arrester becomes defective. The alarm contact shall be wired to the PLC. 

## 8.10 Power Factor Correction 

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: 

• Power factor [0-1-0]. 

• Step indicator (to indicate the current step). 

• Indicating lamps: 

The alarm signal shall be wired to the PLC. 

- Alarm 

- Normal operation 

Capacitors shall be minimum 520 Volt PCB-free, with a loss < 0.2 W/kVAr and comply with: 

• 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, 

• Shunt power reactor , Tristor controlled, last 3 step, 

• 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. 

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. 

## 8.11 Motor Installations 

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 

