Audited Supplier
MZ series on-load tap changers are suitable for power transformers or industrial transformers with a rated voltage of 35 to 220 kV, a maximum rated through-current of 300 A and 600 A for three-phase, 300 A, 600 A, 800 A, 1200 A, and 1500 A for single-phase, and a frequency of 50 to 60 Hz, and for transforming the taps to achieve the purpose of voltage regulation under load.
Three-phase on-load tap changers are used for Y-connections with neutral point voltage regulation, while single-phase on-load tap changers are used for any type of voltage regulation.
| Serial No. | Category | ||||||
| 1 | MZ-III600 | MZ-I600 | MZ-I800 | MZ-I1200 | MZ-I1500 | ||
| 2 | Max. rated through-current(A) | 600 | 600 | 800 | 1200 | 1500 | |
| 3 | Rated frequency (Hz) | 50 | |||||
| 4 | No. of phases and connections | Three-phase Y-connection | Single-phase arbitrary connection | ||||
| 5 | Max. step voltage (V) | 3300 | |||||
| 6 | Rated capacity (kVA) | 1500 | 1980 | 2640 | 3500 | 3500 | |
| 7 | Short-circuit capacity (kA) | Thermal stability (three seconds RMS) | 8 | 8 | 16 | 24 | 24 |
| 8 | Dynamic stability (peak) | 20 | 20 | 40 | 60 | 60 | |
| 9 | No. of working positions | The slot wheel is divided into 10, 12, 14, 16, and 18 gears, without a pole selector maximum of 18, with a polarity selector max. 35. | |||||
| 10 | |||||||
| 11 | Tap changer insulation level | Unit (kV) | Insulation level | ||||
| 12 | 35 | 60 | 110 | 220 | |||
| 13 | Max. working voltage | 40.5 | 72.5 | 126 | 252 | ||
| 14 | Power frequency test voltage (1min) | 85 | 140 | 230 | 460 | ||
| 15 | Impulse test voltage (1.2/50) | 200 | 350 | 550 | 1050 | ||
| 16 | Tap selector | 4 sizes by insulation level, numbered A, B, C, D | |||||
| 17 | Mechanical life | Not less than 800,000 times | |||||
| 18 | Electrical life | Not less than 100,000 times | |||||
| 19 | Toggle switch mailbox | Working pressure | 3×104Pa | ||||
| 20 | Sealing property | 6×104Pa, No leakage for 24 hours | |||||
| 21 | Overpressure protection | Bursting cap 2x105Pa | |||||
| 22 | Keep relay | Rectified oil speed 1.0m/s earth 10% | |||||
| 23 | Discharge volume | About 190~270L | |||||
| 24 | Filling volume | About 125~190L | |||||
| 25 | Weight | About 260~280kg | |||||
| 26 | Fitted motor-drive unit | DQB | |||||
1. Q: What are your main products?
A: For over four decades, our company has specialized in developing and producing on-load tap changers. Our extensive product range caters to power transformers, furnace transformers, specialized transformers, and various other industries.
2. Q: Are you a manufacturer?
A: Yes. Wukai Electric (Jiangsu) Co., Ltd. proudly is a leading on-load tap changer manufacturer. With a state-of-the-art factory spanning 20,000 square meters and a dedicated workforce of over 100 employees, our production line has delivered nearly 100,000 units currently operational in networks worldwide. Additionally, we offer comprehensive OEM and ODM services to meet diverse customer needs.
3. Q: How do you control the quality of your products?
A: We implement a stringent quality control system throughout every stage of the production process. Upon completion, each product undergoes thorough testing by relevant standards. A detailed factory inspection report accompanies all shipping documents, ensuring transparency and reliability.
4. Q: What's your payment terms?
A: We are flexible and accept various payment terms such as T/T, L/C, and more.
5. Q: What are your products packaged for transportation?
A: Our products are securely packaged in robust composite wood crates to ensure safe transportation.
6. Q: What kind of credentials do you have?
A: We hold several prestigious credentials including a Quality Management System Certificate and a High-tech Enterprise Certificate, among others.
7. Q: Can I come to visit your factory?
A: Absolutely! We warmly welcome you to visit our factory and witness our operations firsthand.
