| Customization: | Available |
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| Shell Material: | Steel Plate |
| Voltage Level: | Medium Voltage |
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Our company produces professional 6kV, 10kV, 20kV, and 35kV grounding transformers, including epoxy cast dry-type and oil immersed grounding transformers, as well as single-phase grounding transformers specifically designed for motors.
A. Iron core
High quality cold-rolled oriented silicon steel sheets are used, with 45 ° full diagonal joints. The iron yoke is clamped with a through screw, and the core column is tied with fiberglass tape. The surface of the iron core is sprayed with silicone resin adhesive to prevent moisture, tighten and minimize noise.
B. Winding
Both the inner and outer windings are made of high-quality copper wires, with a segmented cylindrical structure to enhance interlayer insulation. Vacuum drying technology is used, and the formed windings have good electrical performance, high mechanical strength, and low local discharge capacity.
C. Epoxy resin is not filled with vacuum casting for dry-type grounding transformers, which has stronger smoke and water resistance compared to non encapsulated products. The oil immersed grounding transformer adopts a fully sealed structure and uses corrugated fins for heat dissipation to eliminate the oil storage tank. The oil tanks are sealed with oil resistant rubber strips to prevent the transformer oil from coming into contact with air. The transformer oil does not come into contact with air, ensuring the insulation performance and service life of the product. The product has the characteristics of small footprint, beautiful appearance, and maintenance free.
D. Protective device
Oil immersed grounding transformers are equipped with pressure relief valves and gas relays, as well as oil level gauges for easy monitoring of transformer oil levels at any time. The dry-type grounding transformer is equipped with a temperature control device and has remote transmission function, making it convenient to inspect the operating temperature of the product at any time.
3.Main Technical Parameter
| Types | SJD Dry or Oil-immersed |
| Connection group | (ZN (Zigzag), ZNyn, YNd(open), Ii0) |
| Voltage | Up to 36kV |
| Current | Up to 3000A* |
| Duty (Seconds) | 10/30/60 or others |
| Cooling Method | ONAN, ONAF, AN, AF |
| Frequency | 50Hz / 60Hz |
| Installation | Indoor / Outdoor |
| Ambient Temperature | -40 ºC to 40 ºC* |
| Standards | IEC 60076-6, IEC60076-1,IEEE |
| Enclosure Options | Transformer cabinet for any IP degrees with: -CT -VT -Isolation switch |
| 1 | Manufacturing standards | IEC-60076/289 | |
| 2 | Type of transformer (Sealed or Breath) | Breath | |
| 3 | Service condition | outdoor type | |
| 4 | Short time power | kVA | 15240 |
| 5 | Auxiliary winding capacity | kVA | N/A |
| 6 | System Nominal Voltage | kV | 33 |
| 7 | System Max.Voltage | kV | 36 |
| 8 | Secondary voltage | kV | N/A |
| 9 | Secondary Rated current | A | N/A |
| 10 | Short time current for neutral | A | 800 |
| 11 | Duration of short time current | S | 10 |
| 12 | continuous current | A | 10 |
| 13 | Rated frequency | Hz | 50 |
| 14 | Winding connection | ZN | |
| 15 | Zero-sequence impedance | Omiga/phase | 24 |
| 16 | Short circuit impedance ( Auxiliary | % | 6 |
| 17 | Tapping method | no laod | |
| Tapping range | N/A | ||
| 18 | Maximum temperature rise at rated power: | ||
| a)Maximum winding temperature rise | K | 55 | |
| b)Maximum oil Temperature rise | K | 40 | |
| c) Hot spot temperature | ºC | 98 | |
| d) Core and contruction rise | K | 75 | |
| 19 | No load loss | kW | 1.95 |
| 20 | Load losses at 75 °C(Auxiliary winding) | kW | |
| 21 | Total losses at 75°C(Auxiliary winding) | kW | |
| 22 | Insulation level | ||
| a) Primary side | KV | BIL 170 AC 70 | |
| b) Secondary side | KV | N/A | |
| 23 | Maximum flux density in Core | Tesla | <1.6 |
| 24 | Sound level (sound pressure level) | dB | <50 |
| 25 | Cooling | ONAN | |
| 26 | Type and Material of Windings\core and oil: | ||
| a) Primary winding | CU | ||
| b) Secondary winding | N/A | ||
| c) Core material | 30Q120 | ||
| d) Insulating oil | Class | 25#Mineral oil | |
| 27 | Insulation of Windings: | ||
| a) Primary winding | Cable insulating Paper | ||
| b) Secondary winding | Cable insulating Paper | ||
| c) Tapping and tapping connections | Cable insulating Paper | ||
| d) Level of Insulating material | Class | A | |
| 28 | Line terminals (Top of tank or Top Box , | ||
| (a) Primary | N/A | ||
| (b) Secondary | N/A | ||
| 29 | Type of tank (radiator or corrugated) | corrugated | |
| 30 | Bushing creepage distance | ||
| a. Primary | mm/kv | 25 | |
| a. Secondary | mm/kv | N/A | |
| 31 | Material of Transformer Tank | Iron | |
| 32 | Thickness material of Transformer Tank: | ||
| a)Top | mm | 8 | |
| b)Bottom | mm | 8 | |
| c)Sides | mm | 6 | |
| d)Corrugated wall or radiator | mm | 1.2 | |
| e)Shot blasting and two finish coats | Yes/No | Yes | |
| 33 | Thickness of paint | μm | 120 |
| 34 | Weights | ||
| a. Net weight of insulating oil | kgs | 690 | |
| b. Weight of activepart | kgs | 2400 | |
| c. Total weight of transformer | kgs | 3600 | |
| 35 | Transformer dimensions including all | ||
| a) Length | mm | 1790 | |
| b) Breadth | mm | 850 | |
| c) Height | mm | 1650 | |
| 36 | Color of transformer | As per required | |
| Accessories/Fittings supplied | |||
| 1 | Oil temperature indicator | Yes/no | Yes |
| 2 | Oil level Indicator | Yes/no | Yes |
| 3 | Conservator with buchholz relay(Sixin) | Yes/no | Yes |
| 4 | Pressure relieve device | yes/no | Yes |
| 5 | Conservator | yes/no | Yes |
| 6 | Support lugs | Yes/no | Yes |
| 7 | Lifting lugs | Yes/no | Yes |
| 8 | Earthing terminals for tanks | Yes/no | Yes |
| 9 | Danger Plate | Yes/no | Yes |
| 10 | Rating plates | Yes/no | Yes |
| 11 | Current Transformer between Neutral & Earth |
Yes/no | No |
| 12 | Mounting Bi-directional rollers | Yes/no | No |
| B | SERVICE CONDITION | ||
| 1 | Altitude | Meters | 0~2000 |
| 2 | Max Temperatures | Degree | 55 |
| Item&Specs. | Ground-fault Current I0 | Time | Impedance Z0 |
| SJD-4.16KV/200A-10S | 200A | 10s | 2.4~12.0Ω |
| SJD-4.16KV/400A-10S | 400A | 10s | 1.2~6.0Ω |
| SJD-4.16KV/600A-10S | 600A | 10s | 0.8~4.0Ω |
| SJD-12.47KV/200A-10S | 200A | 10s | 7.2-36.0Ω |
| SJD-12.47KV/400A-10S | 400A | 10s | 3.6-18.0Ω |
| SJD-12.47KV/600A-10S | 600A | 10s | 2.4~12.0Ω |
| SJD-13.2KV/200A-10S | 200A | 10s | 7.6~38.1Ω |
| SJD-13.2KV/400A-10S | 400A | 10s | 3.8~19.1Ω |
| SJD-13.2KV/600A-10S | 600A | 10s | 2.5~12.7Ω |
| SJD-13.8KV/200A-10S | 200A | 10s | 8.0~39.8Ω |
| SJD-13.8KV/400A-10S | 400A | 10s | 4.0~19.9Ω |
| SJD-13.8KV/600A-10S | 600A | 10s | 2.6~13.3Ω |
| SJD-13.8KV/800A-10S | 800A | 10s | 2.0~10.0Ω |
| SJD-24.94KV/200A-10S | 200A | 10s | 14.4~72.0Ω |
| SJD-24.94KV/400A-10S | 400A | 10s | 7.2~36.0Ω |
| SJD-24.94KV/600A-10S | 600A | 10s | 4.8~24.0Ω |
| SJD-24.94V/800A-10S | 800A | 10s | 3.6~18.0Ω |
| SJD-24.94V/1000A-10S | 1000A | 10s | 2.8~14.4Ω |
| SJD-34.5KV/200A-10S | 200A | 10s | 14.1~70.7Ω |
| SJD-34.5KV/400A-10S | 400A | 10s | 7.0~35.4Ω |
| SJD-34.5KV/600A-10S | 600A | 10s | 4.7~23.6Ω |
| SJD-34.5V/800A-10S | 800A | 10s | 34~17.7Ω |
| SJD-34.5V/1000A-10S | 1000A | 10s | 2.8~14.2Ω |
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