An ISO 9001 : 2000 Certified Company
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Rated Voltage (kV) |
33 / 22 |
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Type of Installation |
Outdoor, Pedestal Mounted, Upright Standing, Effectively Earthed. |
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Insulation Level (kV) |
70 / 170 |
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Operating Frequency (Hz) |
50 / 60 |
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Primary Current (Amps) |
50 to 1000 |
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Short Time Thermal Current (kA/Sec) |
Tested Value 15kA / 3 Sec., Suitable upto 21 kA / 3Secs. |
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Dynamic Current (kAp) |
Tested Value 40 kAP, Suitable upto 53 kAP |
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Number of Secondaries |
Normal - 2, Max. 3 |
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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 |
Live Tank / Dead Tank |
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Type of Sealing |
By Nitrogen Cushion |
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Reference Standards |
IEC - 185 / ISS – 2705 |
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Creepage Distance Available (mm) |
950 |
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Shipping dimensionis(L x B x H)(mm) |
1500 x 750 x 1250 (Set of 3 CTs) |
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Shipping Weight (Kg) |
450 for set of 3 CTs |
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Manner of Packing |
By Wooden Box |
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Manner of Transportation |
Vertical |
OTHER FEATURES
Design:
i). Insulation - Class A Oil impregnated paper insulation with grading type design. This design results in uniform distribution of stress giving excellent transient stability and low levels of partial discharge.
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 Nitrogen Cushion which effectively prevents the contamination of Transformer Oil with atmosphere, during its service life.
CONSTRUCTION :
The CTs are of Live Tank type with main weight of cores and insulation at top. 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. EHV technology and its service 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 atmosphere are either hot dip galvanized or epoxy painted. The primary windings are wound with EC grade copper strips covered with fiberglass insulation or copper tubes. 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.
Dead Tank design can also be offered on special request
Secondary cores are wound with super enameled hermetic grade or PVA based EC copper rounds. The inter - layer insulation is adequately reinforced to withstand the mechanical forces developed during short circuiting conditions of primary windings.
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 :
The CTs are packed in wooden crates suitably so that they can be transported Vertically. Normally Three CTs are packed in one Wooden Crate to give stability during handling and transportation of the equipment.