Customization Three - phase 11kV 20kV 22kV 30kV grounding/earthing transformers Original Manufacturer
Key attributes
| Brand | ROCKWILL |
| Model NO. | Customization Three - phase 11kV 20kV 22kV 30kV grounding/earthing transformers Original Manufacturer |
| Rated voltage | 11kV |
| Rated frequency | 50/60Hz |
| Series | JDS |
Product descriptions from the supplier
Description
As a pioneer and the first dedicated original manufacturer in China's earthing transformer industry, decades of in-depth technical cultivation have enabled us to accumulate strong strength and even establish the original standards for industry development. From breakthroughs in core technology R&D to large-scale mass production and delivery, we have built an end-to-end independent ecosystem. Leveraging leading and stable product performance as well as extremely reliable quality, we have become a trusted choice in the field of power grid construction.
This three - phase 11kV/22kV grounding transformer is tailor - made for medium - voltage power grids. By creating an artificial neutral point, it accurately achieves the grounding protection function and is suitable for various distribution system scenarios. When facing single - phase grounding faults, it can effectively handle them, building a solid defense for the stable operation of urban power grids and industrial power facilities, and ensuring the reliable power supply of the power system.
Features
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.
Number of phases |
Three rows |
Output voltage |
400V |
Frequency |
50/60Hz |
Input voltage |
11kV 20kV 22kV 30kV 33KV 34.5kV 36kV |
High pressure rating |
11KV/22KV/33KV |
Low pressure rating |
0.4 KV |
Number of coils |
Three Windings |
Link category |
Dyn11 Yyno |
Coil structure |
toroidal |
Certification |
IEC60076 |
Insulation level: |
Dyn11 Yyno |
Application |
Industrial Equipments |
Standard |
IEC60076 |
Use |
Power transformer |
Class |
Oil - Immersed Transformer |
Product name |
Grounding Transformer |
Application Environment Description
Neutral Grounding Systems：Suitable for ungrounded, resistance-grounded, or arc-suppression-coil grounded medium-voltage distribution networks. Limits fault current and improves power supply reliability.
Harsh Physical Environments：IP54/IP56 protection rating, resistant to salt mist and dust. Suitable for altitudes up to 3000m and ambient temperatures from -25°C to +45°C.
Space-Constrained Locations：Compact dry-type design suitable for confined spaces such as underground substations, data centers, and ship engine rooms.
New Energy and Industrial Applications：Neutral grounding protection for systems including wind/solar power plants, rail transit, mining facilities, and oil platforms.
Special Electrical Environments：Compatible with systems containing harmonic pollution, frequent start-stop loads, and smart grids requiring coordination with protection devices.
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Voltage level range: Medium Voltage (MV) 3.3kV-44kV (common 3.3kV, 6kV, 11kV, 15kV, 33kV), High Voltage (HV) 66kV-150kV (mainstream 66kV, 110kV, 132kV), Extra-High Voltage (EHV) 220kV-400kV+ (such as 220kV, 330kV, 400kV), all in line with the nominal voltage specifications of IEC 60038 and ANSI C84.1 standards.
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Selection principles: The core is "voltage matching + scenario adaptation". ① Accurate voltage matching: The rated voltage of the selected earthing/grounding transformer must be consistent with the system line voltage (for example, a 110kV system needs to select a 110kV grade earthing/grounding transformer) to avoid insulation breakdown or parameter mismatch; ② For low-voltage and medium-voltage indoor scenarios, dry-type is preferred (such as cast resin insulation for 33kV chemical plant areas), and for high-voltage outdoor scenarios, oil-immersed type is preferred (such as ONAF cooled oil-immersed type for 110kV outdoor substations); ③ For extra-high voltage systems (220kV and above), focus on the zero-sequence impedance parameter to ensure coordination with the relay protection setting value.
"Short-time capacity" is a core performance indicator of earthing/grounding transformers, referring to their ability to safely carry the maximum ground fault current within a specified time (such as 30 seconds). This is determined by their operating characteristics of "short-time operation during faults and light load or no-load during normal operation".
kVA=3×V×I, where V is the system phase voltage and I is the maximum ground fault current. For example, for a 110kV system (phase voltage about 63.5kV), if the maximum ground fault current is 100A, the 30-second short-time capacity is 3×63.5×100≈19050kVA (19.05MVA).Fault withstand time refers to the maximum time that an earthing/grounding transformer can withstand the thermal and mechanical stresses generated by fault current without damage under rated short-time capacity. It is the core basis for insulation and structural design. The IEEE 32 and IEC 60076-5 standards specify four types of standard durations: ① 10 seconds: suitable for fast-acting protection systems (such as optical fiber differential protection), where faults can be isolated within 10 seconds; ② 30 seconds: the most mainstream withstand level, suitable for the relay protection action time of most distribution networks and transmission systems; ③ 60 seconds: used for old systems or complex power grids with long protection action time; ④ 1 hour: only applicable to high-resistance grounding systems, where the fault current is small but long-term monitoring is required.
Zero-sequence impedance is a key parameter that determines the magnitude of ground fault current, directly affecting the sensitivity and reliability of relay protection. Its function is to "accurately control the amplitude of fault current" — ensuring that the fault current is large enough to trigger the protection action, while avoiding excessive current that may damage equipment.
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Related Knowledges
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How to Increase Transformer Capacity? What Needs to Be Replaced for Transformer Capacity Upgrade?How to Increase Transformer Capacity? What Needs to Be Replaced for Transformer Capacity Upgrade?Transformer capacity upgrade refers to improving the capacity of a transformer without replacing the entire unit, through certain methods. In applications requiring high current or high power output, transformer capacity upgrades are often necessary to meet demand. This article introduces methods for transformer capacity upgrade and the components that need to be replaced.A transformer is a criticalEcho12/04/2025 -
Causes of Transformer Differential Current and Hazards of Transformer Bias CurrentCauses of Transformer Differential Current and Hazards of Transformer Bias CurrentTransformer differential current is caused by factors such as incomplete symmetry of the magnetic circuit or insulation damage. Differential current occurs when the primary and secondary sides of the transformer are grounded or when the load is unbalanced.Firstly, transformer differential current leads to energy waste. Differential current causes additional power loss in the transformer, increasing the load on theEdwiin12/04/2025 -
Protection Logic Improvement and Engineering Application of Grounding Transformers in Rail Transit Power Supply Systems1. System Configuration and Operating ConditionsThe main transformers at Zhengzhou Rail Transit’s Convention & Exhibition Center Main Substation and Municipal Stadium Main Substation adopt a star/delta winding connection with a non-grounded neutral point operation mode. On the 35 kV bus side, a Zigzag grounding transformer is used, connected to ground through a low-value resistor, and also supplies station service loads. When a single-phase ground short-circuit fault occurs on a line, a pathEcho12/04/2025
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