Manufactured using high grade of Epoxy Resin System
Gemini Instratech manufactures a wide range of CTs (Wound Primary / Bar Primary / Window) available from 3.6 kV to 36 kV. Current Transformers are cast using a liquid resin system with plasticizer processed under vacuum at controlled temperatures. All CTs have been type tested as per latest revision of IEC 60044‐1. A variety of different frames cover CTs with primary currents ranging from 5 Amperes to 5000 Amperes. CT designs are tailor-made to suit customer requirements for specific applications.
Product Features
Manufactured using high grade of Epoxy Resin System
Suitable for temperature range -40° C to +80° C.
High mechanical stability of the winding and high strength against impulse and surge voltages.
high mechanical strength against the forces developed during dynamic currents.
Current Tranformers Specification
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Unit |
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Standard |
IEC 60044-1 (2003); IS 2705 (1992) |
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Highest System Voltage |
kV |
3.6 |
7.2 |
12 |
17.5 |
24 |
36 |
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One Min, Power Frequency Voltage |
kV |
15 |
28 |
38 |
38 |
50 |
95 |
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Lightning Impulse |
kVp |
40 |
60 |
95 |
95 |
125 |
200 |
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Max. Short Time Current for 3 seconds |
kA |
40 |
40 |
40 |
40 |
40 |
40 |
Voltage Transformers Specification
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Unit |
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Standard |
IEC 60044-2 (2003); IS 3156 (1992) |
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Highest System Voltage |
kV |
3.6 |
7.2 |
12 |
17.5 |
24 |
36 |
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One Min, Power Frequency Voltage |
kV |
15 |
28 |
38 |
38 |
50 |
95 |
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Lightning Impulse |
kVp |
40 |
60 |
95 |
95 |
125 |
200 |
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Max. Voltage Factor |
kA |
1.2 continuous /1.9 for 8 hrs. |
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Cyclo-aliphatic resin is well proven and the most adopted outdoor insulation worldwide, in a wide range of climatic conditions. Our present range of products are available up to 36 kV system voltages.
Design
The chief insulating agent used is non-aging Cyclo-Aliphatic Resin , which is a proven insulating material. The instrument transformer is encapsulated in the resin in a single process, under vacuum and in controlled temperature. The transformer is very compact and practically requires very little maintenance.
The Instrument Transformer is designed and processed to obtain partial discharge-free performance even at elevated voltages.
Cyclo-Aliphatic Resin Cast Instrument Transformers are designed to international standards.
Current Tranformers Specification
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Highest System Voltage |
Unit |
12 kV |
24 kV |
36 kV |
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Applicable Standards |
IEC 60044-1 (2003); IS 2705 (1992) |
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Rated System Voltage |
kV |
11 |
22 |
33 |
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Type Designation CT |
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GDC 12-1 |
GDC 36-1 |
GDC 36-1 |
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One Min, Power Frequency. DRY/WET Withstand Voltage on Primary Winding |
kV |
28/38 |
50/55 |
70/85 |
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One Min. Power Frequency Withstand Voltage On Secondary Windings |
kV |
3 kV or as per relevant standard. |
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Lightning Impulse |
kVp |
95 |
125 |
170 |
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Total Creepage Distance |
mm |
400 |
900 |
900 |
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Rated Primary Current |
A |
Up to 1600 A. |
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Rated Secondary Current |
A |
1A or 5A. |
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Short Time Thermal Withstand Current/Duration |
kA/s |
40/1 |
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Short Time Dynamic Withstand Current |
kAp |
100 |
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Number of Cores |
3/4 or as per requirement. |
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Output/Accuracy |
As per requirement. |
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Voltage Transformers Specification
|
Highest System Voltage |
Unit |
12 kV |
24 kV |
36 kV |
|
Applicable Standards |
IEC 60044-2 (2003); IS 3156 (1992) |
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Rated System Voltage |
kV |
11 |
22 |
33 |
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Type Designation VT |
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GDV 12-1 |
GDV 36-1 |
GDV 36-1 |
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One Min, Power Frequency. DRY/WET Withstand Voltage on Primary Winding |
kV |
28/38 |
50/55 |
70/85 |
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One Min. Power Frequency Withstand Voltage On Secondary Windings |
kV |
3 kV or as per relevant standard. |
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Lightning Impulse |
kVp |
95 |
125 |
170 |
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Total Creepage Distance |
mm |
400 |
900 |
900 |
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Rated Primary Voltage |
kV |
11kV/ √3 |
22kV/ √3 |
33kV/ √3 |
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Rated Primary Voltage |
V |
110V/√3 or 110V/3 or 110V. |
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Rated Secondary Voltage |
V |
1A or 5A. |
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Voltage Factor |
1.2 cont./1.9 for 8 hours. |
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Output/Accuracy |
As per requirement. |
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Number of Secondary Windings |
Maximum 3 |
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Short Circuit Withstand Capability |
s |
1 second. |
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These parameters are standard values. For other specifications, please contact us.
