Grid and system protection for specialist partners

Protection requirements

Safe parallel operation with the distribution grid

The grid and system protection prevents inadmissible grid disturbances and reliably disconnects systems from the grid in the event of limit value violations.

For photovoltaic systems, storage systems, emergency power systems, CHP plants or other power generation installations, the protection concept, decoupling protection, coupling switch, inverter parameters and metering concept must be aligned with the requirements of BKW and the applicable industry recommendations. Specialist partners submit the necessary evidence in good time with the technical connection application.

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Specialist topics

Protection, control and documentation

The key technical areas of action for the connection of generation facilities and installations with grid impact.

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Grid and system protection

Protection and decoupling devices must ensure that installations are safely disconnected from the distribution grid in the event of grid faults, islanding or limit violations.

Procedure

Manage the protection concept properly through to commissioning

For an efficient review, BKW needs complete technical information already in the connection application.

The steps are based on the grid connection process for specialist partners and focus on the protection-related evidence.

Grid connection point 01

Assess the installation and grid connection point

Record the system capacity, feed-in/import capacity, grid level, connection type, metering concept, operating mode and any possible feedback effects.

Documents 02

Submit daily work slips with protective documents

Submit the technical connection application including the schematic diagram, data sheets, protection concept, inverter details, Q(U) parameterisation and information on the coupling point.

BKW feedback 03

Implement feedback and requirements

Review BKW feedback and take any requirements regarding NA protection, grid support, emergency control, metering or parameterisation into account during implementation.

Documentation 04

Check and document installation

Check protection relays, coupling switches, inverter parameters, and measuring and control components. Fully document parameterisation and test results.

Retention 05

Complete commissioning and documentation

After successful inspection, commission the installation, submit the SiNa and project-specific certificates, and retain the documentation for future inspections.

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Faults & operation

Systematically isolate PV faults

In the event of repeated shutdowns or error messages, grid quality, parameterisation, protection limits and system components must be checked systematically.

Faults in photovoltaic systems can be caused by local grid conditions, voltage rise, inverter parameters, protection limit values, communication/control components or installation errors. For quick clarification, measured values, fault logs, parameter settings, diagrams, system output and location details must be provided.

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FAQ for specialist partners

Frequently asked questions about grid and system protection

Brief answers on NA protection, inverter parameters and faults.

The content is aimed at electrical installers, planners, solar installers and other technical specialist partners.

For project-specific questions about the protection concept, inverter parameterisation, grid feedback effects, faults or commissioning, the BKW grid connection team will provide support.