220-66-kv-xmer-on-line-nifes-r4-sept-08 - Gujarat Electricity Board

GETCO/E/TS – XMER01power/R4 Sept 08
Annexure - II
Technical Specification For On Line Moisture and Gas In Oil Analyser For New
Transformer With Model Analysis Software And Remote Data
Transfer/Communications through internet:
1.0 GENERAL:
The transformer shall be equipped with on line moisture and gas in oil analyzer system,
‘HYDRAN – M2’ or equivalent with model analysis software and remote data transfer /
communications. It is intended to continuously monitor the evolution of dissolved gases
from the oil of transformer with the help of a gas in oil sensor with no moving
parts or pump to detect and continuously monitor a composite value of gases
like H2 (Hydrogen), CO (Carbon monoxide), C2H2 (Acetylene), C2H4 (Ethylene), etc.
The system shall be installed on a single, open bore ball or gate valve. The
system shall also continuously monitor the moisture content in the transformer oil to
result a comprehensive incipient fault monitoring system.
Based on the type and configuration of the transformer and with 4, 4-20mA
input channels and appropriate non intrusive sensors, the system shall be
capable of utilizing the measured parameters of temperature, cooling bank
status and load currents to derive the following model calculations (based on
IEEE and/or IEC Standards). The original factory test report for the
transformer will be made available to properly configure these model
calculations.
• Apparent Power
• Load Current
• PPM value of composite combustible gas measurement
• Short term and long term rate of change of PPM value of composite
combustible gas measurement
• PPM water content in oil
• Water in oil condensation temperature
• Winding hotspot temperature
• Moisture content in winding insulating paper
• Moisture content in barrier insulation
• Relative ageing of the transformer insulation system taking into account
winding hotspot temperature and moisture content in winding insulating
paper.
• Bubble inception temperature
• Cooling system status
• OLTC Tap position tracking (when equipped with OLTC)
• OLTC temperature differential modeling (when equipped with external
type OLTC)
2.0 SCOPE of WORK:
This is as a part of transformer supply, the transformer manufacturer shall also include
in the scope of this tender, to supply, provision, mounting, erection, commissioning, etc;
but not limited to the following, for on line moisture and gas in oil analyzer system.
Sign and Seal of Bidder Page 72 of 87