| Brand | ROCKWILL |
| Model NO. | Customization 15kV 30kV 33kV 34.5kV 36kV Three Phase Neutral Grounding/earthing Transformer direct supply |
| Rated voltage | 36kV |
| Rated normal current | 3000A |
| Rated frequency | 50/60Hz |
| Series | JDS |
Description
As a pioneer and the first dedicated original equipment manufacturer (OEM) in China's earthing transformer industry, we have laid the original benchmark for the industry's development with our profound technical strength accumulated through decades of intensive cultivation. From the independent R&D of core technologies to large-scale mass production, we have built a full-process independently controllable system. Relying on stable and leading product performance and unparalleled reliability, we have become a preferred partner in the field of power grid construction.
This grounding transformer, suitable for systems up to 36kV, is a specialized electrical device. It creates an artificial neutral point in power grids, playing a crucial role in grounding protection. By effectively handling single - phase ground faults, it ensures the stable operation of medium - voltage power systems, whether in urban distribution networks or industrial power setups.
Feature
Voltage Adaptability：Designed for up to 36kV systems, it matches the common voltage levels of medium - voltage power grids, ensuring wide - ranging applicability.
Fault Handling：Efficiently suppresses arc - grounding overvoltages during single - phase ground faults. It helps reduce ground fault currents, minimizing damage to power grid equipment and enhancing system reliability.
Robust Construction：Built with high - quality materials like premium magnetic cores and durable windings. The enclosure is sturdy, resisting harsh environmental factors such as moisture and dust, ensuring long - term stable performance.
Safety Enhancement：Provides a reliable neutral grounding solution, preventing abnormal voltage fluctuations and equipment insulation damage, thus safeguarding the safety of the entire power grid and connected electrical devices.
Main technical parameter
Some of these earthing transformers cover voltage levels including：3.3kV / 6kV / 11kV / 15kV / 20kV / 22kV / 30kV / 33kV / 34.5kV / 36kV / 44kV / 66kV / 88kV / 110kV / 132kV / 145kV / 150kV / 220kV / 275kV / 330kV / 400kV, etc. The current withstand time ranges from 1s, 2s, 3s, 5s, 6s, 8s, 9s, 10s, 30s, 60s, 1hour to 2hours, and customization is available.
Types |
oil-immersed [ZN(Zig-zag), ZNyn] |
Voltage |
Up to 36kV |
Current |
Up to 3000A |
Duty (seconds) |
10 / 30 / 60 or others |
Cooling method |
ONAN, ONAF; AN, AF |
Frequency |
50 / 60Hz |
Installation |
Indoor / Outdoor |
Ambient Temperature |
-25°C to 40°C |
Standards |
IEC 60076-6 IEC 60076-1 |
Enclosure Options |
Transformer cabinets for any IP degreess with: -CT -VT -Isolation switch |
Note: This parameter table is for reference. We can offer customize production tailored to client specifications.
Scope of Application
Suitable for scenarios with varying capacities and voltage levels.
35kV and Above Distribution Networks: Transformer windings typically adopt a star (Y) connection with an accessible neutral point, eliminating the need for grounding transformers.
6kV and 10kV Distribution Networks: Transformer windings mostly use delta (Δ) connections without accessible neutral points, requiring grounding transformers to provide a neutral point.
Special Scenarios: When system unbalanced voltage is high, Z-type transformers can meet measurement requirements through balanced design of their three-phase windings. When system unbalanced voltage is low (e.g., fully cable-based networks), the neutral point of Z-type transformers must generate an unbalanced voltage of 30-70V to satisfy measurement criteria.
Purpose and Function: Provides a return path for fault currents, ensuring safety and stability during ground faults.
Operating Principle During Faults: During a ground fault, fault current flows through the transformer’s neutral point. The counteracting magnetic flux generated by reverse current neutralizes impedance.
Voltage and Current Ratings: Rated voltage matches the system’s line voltage. Capable of withstanding maximum fault currents for up to 30 seconds.
