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 Voltage (kV) |
19.05 / 12.7 |
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Secondary Voltage (kV) |
63.5 / 110 |
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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 |
Dead Tank |
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Type of Sealing |
By Nitrogen Cushion |
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Reference Standards |
IEC - 186 / ISS – 3156 |
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Creepage Distance Available (mm) |
950 |
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Shipping dimensionis(L x B x H)(mm) |
1500 x 800 x 1200 (set of 3 VTs) |
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Shipping Weight (Kg) |
450 Kgs (set of 3 VTs) |
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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 is used with grading type design. This design results in uniform distribution of stresses giving excellent transient stability and low levels of partial discharges. This is a bottom tank design with core and coils housed in the bottom tank.
ii. Processing & Oil Filling : VTs are dried and oil filled under very high vacuum (0.05 torr), after going through rigorous process cycles at High Temperature & Vacuum (105 deg C to 120 deg C and 0.05 torr).
iii. Ratio Changing - Different ratios of voltages can be selected from secondary side only.
iv. Hermetically Sealing - The VTs are hermetically sealed using Nitrogen Cushion, which effectively prevent the contamination of transformer oil with atmosphere during its service life.
CONSTRUCTION :
The EMVT is a bottom tank design having the core and coils housed in the bottom tank. The primary lead is brought to the top chamber through a graded insulated tube encased in the hollow porcelain insulator. The high voltage coil is wound with many thousand turns of high-grade hermetic grade of super enameled insulated copper conductor. The design is indigenous based on 25 years of experience in High Voltage Technology and its implementation in extreme climatic conditions of India. All metal parts exposed to atmosphere are either hot dip galvanized or epoxy painted.
TESTING :
All VTs are tested for routine test as per relevant standards. Type tests are carried out occasionally 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 VTs are packed suitably in wooden crates so that they can be transported vertically without any difficulty. Normally three VTs are packed in one Wooden Crate to give stability during handling and transportation of the equipment.