Photovoltaic inverter grid-connected transformers
Key attributes
| Brand | ROCKWILL |
| Model NO. | Photovoltaic inverter grid-connected transformers |
| Rated frequency | 50/60Hz |
| Rated capacity | 60KVA |
| Series | SGG |
Product descriptions from the supplier
Product Overview：
An isolated transformer is a double-winding transformer that not only achieves voltage transformation in the power grid but also provides electrical safety isolation between input and output windings. This feature effectively prevents electric shock hazards when the human body comes into simultaneous contact with live components (or metal parts that may become charged due to insulation damage) and the ground. Additionally, it can isolate the third harmonics in the power grid, reduce heat generation during equipment operation, and extend the service life of insulating materials. It also functions to suppress and eliminate interferences such as noise, clutter, high voltage, and surges in the power grid, providing a pure power environment for equipment.
The dry-type photovoltaic transformers produced by our company are special transformers designed for photovoltaic grid-connected inverters. Adopting a foil winding process, the transformer core features a full-joint structure, and the core laminations are made of low-loss oriented silicon steel sheets, offering significant advantages of low loss, high efficiency, and low temperature rise. This series of transformers is suitable for circuits with an AC frequency of 50Hz/60Hz and a rated voltage below 690V, and can be custom-designed and manufactured according to specific user requirements.
Product features
Energy-saving and low-noise：High-quality cold-rolled silicon steel sheets are used for stacking; The special dipping process is used to effectively reduce the vibration and noise during operation; As well as the introduction of new processes and technologies such as the design of high-temperature resistant insulation materials, the transformer is more energy-saving and quieter. The coil has a ventilation groove to allow for smooth air flow, effectively reducing the coil temperature.
High reliability：The structure is reasonable, the efficiency is high, the waveform is not distorted, it is convenient and reliable to use, it can run for a long time, and the performance indicators fully meet the standard requirements of GB/6450 dry-type power transformer. It can isolate the power supply of the main power grid, anti-shock, anti-interference, and anti-lightning.
Eco-friendly features：It has heat resistance, moisture resistance, stability, chemical compatibility, low temperature resistance, radiation resistance and non-toxicity.
Versatility：From a single transformer to a multi-functional combined transformer with air cooling, protective housing, transformer and so on.
Model specifications：
Note：The dimensions and technical indicators of the above products can be customized according to customer requirements.
Application scenarios：
SGG/SD series photovoltaic inverter grid-connected transformer is a supporting product of solar photovoltaic, its rated input voltage is AC three-phase 270V, rated output voltage is AC three-phase 400V, rated working frequency is 50/60HZ, it will be the direct current in the solar energy through the photovoltaic inverter inverter out of the three-phase AC 270V voltage isolation and step-up into three-phase AC 400V voltage, in order to be integrated into the grid or directly supply the single-phase 220V and three-phase 380V AC power supply required by users.
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Related Knowledges
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Main Transformer Accidents and Light Gas Operation Issues1. Accident Record (March 19, 2019)At 16:13 on March 19, 2019, the monitoring background reported a light gas action of No. 3 main transformer. In accordance with the Code for Operation of Power Transformers (DL/T572-2010), operation and maintenance (O&M) personnel inspected the on-site condition of No. 3 main transformer.On-site confirmation: The WBH non-electrical protection panel of No. 3 main transformer reported a Phase B light gas action of the transformer body, and the reset was ineff02/05/2026 -
Faults and Handling of Single-phase Grounding in 10kV Distribution LinesCharacteristics and Detection Devices for Single-Phase Ground Faults1. Characteristics of Single-Phase Ground FaultsCentral Alarm Signals:The warning bell rings, and the indicator lamp labeled “Ground Fault on [X] kV Bus Section [Y]” illuminates. In systems with a Petersen coil (arc suppression coil) grounding the neutral point, the “Petersen Coil Operated” indicator also lights up.Insulation Monitoring Voltmeter Indications:The voltage of the faulted phase decreases (in01/30/2026 -
Neutral point grounding operation mode for 110kV～220kV power grid transformersThe arrangement of neutral point grounding operation modes for 110kV～220kV power grid transformers shall meet the insulation withstand requirements of transformer neutral points, and shall also strive to keep the zero-sequence impedance of substations basically unchanged, while ensuring that the zero-sequence comprehensive impedance at any short-circuit point in the system does not exceed three times the positive-sequence comprehensive impedance.For 220kV and 110kV transformers in new constructi01/29/2026 -
Why Do Substations Use Stones, Gravel, Pebbles, and Crushed Rock?Why Do Substations Use Stones, Gravel, Pebbles, and Crushed Rock?In substations, equipment such as power and distribution transformers, transmission lines, voltage transformers, current transformers, and disconnect switches all require grounding. Beyond grounding, we will now explore in depth why gravel and crushed stone are commonly used in substations. Though they appear ordinary, these stones play a critical safety and functional role.In substation grounding design—especially when multiple gr01/29/2026 -
Why Must a Transformer Core Be Grounded at Only One Point? Isn't Multi-Point Grounding More Reliable?Why Does the Transformer Core Need to Be Grounded?During operation, the transformer core, along with the metal structures, parts, and components that fix the core and windings, are all situated in a strong electric field. Under the influence of this electric field, they acquire a relatively high potential with respect to ground. If the core is not grounded, a potential difference will exist between the core and the grounded clamping structures and tank, which may lead to intermittent discharge.I01/29/2026 -
Understanding Transformer Neutral GroundingI. What is a Neutral Point?In transformers and generators, the neutral point is a specific point in the winding where the absolute voltage between this point and each external terminal is equal. In the diagram below, pointOrepresents the neutral point.II. Why Does the Neutral Point Need Grounding?The electrical connection method between the neutral point and earth in a three-phase AC power system is called theneutral grounding method. This grounding method directly affects:The safety, reliabilit01/29/2026
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