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 Temperature rise. If the manufacturer can provide evidence covering temperature rise tests for transformers of similar type and design, Type Test certificates will be acceptable. 

 Prior to dispatch to site the Contractor shall pass to the Engineer or its representative, in triplicate, copies of the all test certificates for approval. 

## 8.5.4 Instruments & Power Analyzers 

The measuring transformers shall at least include load for the following instruments, all within Class 1: 

There will be Multifunction Power Analyzer with minimum 2 Port Ethernet Communication at outlet of all transformer, generator and CHP units. There will be current, voltage, active/capacitive/reactive power, cos F , frequency in power analyzer, it will be able to create alarm, IEC/ANSI power accuracy class will be 0,2 there will be 4 digital input/ 2 digital output, it will be able to report in EN 50160 standard, it will have IEC 61000- 4- 30 class A or Class S, All these data will be communicated to SCADA.The meter supports TCP/IP, HTTP, SNTP, SNMP, SMTP and FTP protocols and can communicate at data speeds up to 100 Mbps through its Ethernet communications port. The meter supports a single IP address between two 10/100Base-T Ethernet ports. 

Instrument current transformers for protection equipment shall be installed. 

Current transformers shall be of the wound primary or bar primary type according to the ratio required. Current transformers shall be suitably rated and designed to carry out appropriate metering and protection functions as indicated. 

The rated load of current transformers shall not be less than the sum of loads of all relays, instruments and related loads. The current transformers shall have a continuous thermal current capacity in accordance with the current capacity of the relevant switchgear, and a short circuit capacity of the plant. 

All available signals shall be provided for telemetry and wired to the PLC for remote control and monitoring. 

## 8.5.5 Earthing system 

The systems shall be designed according to below list; 

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The avarage of all earth network shall be provided with an earthing system less than 1 ohm. 

The earthing system shall be constructed of earth rods driven into the ground beneath, or as close as practicable to the foundation of the transformers. An additional earthing connection between the earthing rods may be installed in as a ring electrode if needed. When strips are used, they may be buried beneath the foundation or laid in trenches at least at 1.5 m depth. 

The rod electrodes shall be depth electrodes of copper with low carbon steel core not less than 1,5 meter length and 20 mm in diameter in all earthing system. 

Galvanize strip 30x3,5 mm will be used for building earthing system. The galvanize strip shall be connected other buildings minimum by 50 mm$^{2 }$stranded copper wire. 

