The 10 kV cabinet that connects a photovoltaic plant to the medium-voltage network, with anti-islanding protection, revenue metering and dispatch communication built in.
Grid connection is where most PV projects lose time. The cabinet is the piece that the utility reviews in detail, and it is the piece where the protection settings, the metering arrangement and the communication protocol have to all match the operator's requirements at the same time.
The 10 kV photovoltaic grid-connection cabinet is the physical interface between a PV plant and the medium-voltage network. It is built on the KYN28A-12 withdrawable cabinet frame and integrates the vacuum circuit breaker, the protection and measurement devices, the revenue meter and the dispatch communication unit. Its purpose is to make the connection acceptable to the grid operator — that is why the protection scheme, the metering class and the communication interface are the three things the utility actually reviews.
The plant's stepped-up power arrives at the cabinet and passes through the vacuum circuit breaker. Overcurrent, instantaneous and zero-sequence protection operate on the incoming side, while a dedicated anti-islanding relay monitors the grid voltage and frequency and opens the breaker if the grid loses the reference — which prevents the plant from continuing to feed an isolated section of the network. The revenue meter at 0.2S class provides the settlement measurement, and the dispatch communication unit carries the four-remote signals required by the grid operator.
| Parameter | Typical value |
|---|---|
| Rated voltage | 10 kV |
| Rated current | 630 A / 1250 A |
| Connection switch | Vacuum circuit breaker, withdrawable |
| Protection | Overcurrent, instantaneous, zero-sequence and anti-islanding protection |
| Measurement and control | Integrated protection and control device |
| Metering | Revenue metering at 0.2S class |
| Dispatch communication | RTU / communication management unit for the four-remote functions |
| Cabinet type | KYN28A-12 |
| Protection class | IP4X enclosure, IP2X with breaker compartment door open |
| Ambient temperature | -25 °C to +40 °C |
| Compliance | GB/T 3906-2020, GB/T 11022-2020, GB/T 19964 (PV power station design), local grid code for the protection scheme |
Start with the grid connection approval, because the protection scheme, the metering class and the communication protocol all come from it. Then size the breaker on the plant's maximum export current rather than on the inverter rating, since the export limit is what actually flows through the cabinet. Third, fix the CT and PT ratios against the settlement metering requirement, because the ratio determines the metering accuracy that the utility will accept. Finally, confirm the auxiliary supply and the cabinet environmental requirements, because an MV cabinet in an unsheltered location needs the heater and the anti-condensation option, and these are easy to omit from an early quotation.
It is the MV cabinet that connects a photovoltaic plant to the 10 kV network. It contains the connection circuit breaker, the protection and control devices, the revenue metering and the dispatch communication interface, and it is the equipment the grid operator reviews before accepting the connection.
Yes. Each grid-connection cabinet integrates a dedicated anti-islanding protection relay per the applicable grid code, together with the circuit breaker, surge protection, the bidirectional metering and the monitoring interface.
Yes. The cabinet is designed around the protection and communication logic of the specified inverter platform, and the export limitation interface is matched to the plant controller.
0.2S class revenue metering at the grid connection point, with the CT and PT ratios confirmed against the settlement requirement stated in the grid approval.
For plants above the capacity threshold set by the grid operator, yes — the connection must carry telecontrol, telesignal, telemetering and teleadjustment. The communication unit and the protocol are confirmed against the operator's requirement.
GB/T 3906-2020 and GB/T 11022-2020 for the switchgear itself, GB/T 19964 for PV power station design, and the local grid code for the protection and anti-islanding scheme.
15 days for customized grid-connection cabinets, counted from deposit plus confirmed technical agreement plus approved drawing.
Send us the rated voltage, rated current or capacity, quantity and destination country, plus any single-line diagram. We reply with a configuration proposal and a quotation — usually within 24 hours of receiving complete technical information.
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