An ISO 9001 : 2000 Certified Company
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Rated Voltage (kV) |
220 |
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Type of Installation |
Outdoor, Pedestal Mounted, Upright |
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Standing, Effectively Earthed. |
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Insulation Level (kV) |
460 / 1050 |
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Operating Frequency (Hz) |
50 / 60 |
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Primary Current (Amps) |
100 to 2400 |
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Short Time Thermal Current (kA/Sec) |
Tested Value 40kA / 3 Sec., Suitable upto 50 kA / 3Secs. |
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Dynamic Current (kAp) |
Tested Value 100 kAP, Suitable upto 125 kAP |
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Number of Secondaries |
Normal - 5, Max. 6 |
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Accuracy Class |
Metering - 0.5 (Regular), 0.2 (special) & Protection - All classes as per relevant standards. |
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Type of Design |
Dead Tank |
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Type of Sealing |
By Stainless Steel Bellows. |
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Reference Standards |
IEC - 185 / ISS – 2705. |
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Creepage Distance Available (mm) |
6200(max.7450mm as special case) |
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Shipping dimensionis(L x B x H)(mm) |
4300 x 900 x 650 |
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Shipping Weight (Kg) |
1500 |
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Manner of Packing |
By Steel Structures & Wooden Box |
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Manner of Transportation |
Horizontal |
OTHER FEATURES
DESIGN :
i). Insulation - Class A Oil impregnated paper insulation is used with grading type design. This design results in uniform distribution of stress giving excellent transient stability and low levels of partial discharges.
ii). Processing & Oil Filling - CTs are dried and oil filled under very high vacuum (0.05 torr), after going through rigorous process cycles at high temperatures and vacuum (105 deg. C to 120 deg. C and 0.05 torr).
iii). Ratio Changing - Different ratios can be selected with reconnections on primary or secondary sides.
iv). Hermetic Sealing - the CTs are hermetically sealed using Stainless Steel Bellows which effectively prevents the contamination of Transformer Oil with atmosphere, during its service life. Normally, equipments which are transported horizontally to site, are not recommended for Nitrogen Sealing. However if very much desired by our customers it can be met with.
CONSTRUCTION :
The CTs are of Dead Tank type with main weight of cores and insulation at bottom , giving very good mechanical stability considering the extra height of the equipment. INSULATORS used are Hollow types with ALTERNATE SHED Design as per latest IEC recommendation. They are most suitable for HOT LINE WASHING. The design is indigenous based on 25 years of experience in EHV technology and its implementation in extreme climatic conditions of India, right from the hilly region of North & NE to down South & SW Sea Level. All metal parts exposed to the atmosphere are either hot dip galvanized or epoxy painted. The primary winding is wound with EC grade copper tubes or copper strips covered with fiberglass insulation. The primary winding is adequately reinforced to withstand repeated mechanical forces developed during the passage of very high short circuiting currents through the CT, due to various faults developed in the system. The secondary cores are wound with super enameled hermetic grade or PVA based EC copper round conductors. The inter - layer insulation is adequately reinforced to withstand the normal operating inerlayer voltages as well as transient overvoltages.
TESTING :
All CTs are tested for routine test as per relevant standards. Type tests are frequently carried out to keep the quality check. Facilities for type tests such as Temperature Rise and High Voltage Power Frequency Tests (both Wet & Dry), are available in our Lab.
PACKING & TRANSPORTATION :
Considering the extra height of the equipment and the various limitations in transportation, the CTs are packed in metal structure suitably so that they can be transported Horizontally. Metal structure also permits the CTs to be stored horizontally for prolonged time at main stores of Electric Supply Companies without deterioration, which normally happens in case of wooden packing.