System and method for automatic isolation of string combiner from a solar inverter

The integrated DC MCCB with a shunt trip coil and inverter control card automates fault-specific isolation of the SCB from the inverter, addressing safety and equipment protection issues in photovoltaic systems.

WO2026110169A1PCT designated stage Publication Date: 2026-05-28TATA POWER SOLAR SYST
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
TATA POWER SOLAR SYST
Filing Date
2025-04-02
Publication Date
2026-05-28

AI Technical Summary

Technical Problem

Existing photovoltaic solar systems lack automatic isolation of the String Combiner Box (SCB) from the solar inverter during electrical faults, leading to high-current discharge, safety risks, and potential equipment damage, particularly in challenging installations like rooftops and remote locations.

Method used

An integrated DC molded case circuit breaker (MCCB) with a shunt trip coil and an inverter control card for continuous fault detection, enabling automated isolation of the SCB from the inverter upon fault detection.

Benefits of technology

The system ensures quick and safe disconnection of faulty sections, minimizing manual intervention, reducing equipment damage, and enhancing safety in photovoltaic systems, especially in hard-to-access locations.

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Abstract

The present invention discloses a system and method for automatic isolation of a String Combiner Box (SCB) (104) from a solar inverter (108) in photovoltaic solar systems. The system comprises at least one solar panel string (102) configured to generate a DC output, an SCB (104) to consolidate the DC outputs, and a DC molded case circuit breaker (MCCB) (106) with an integrated shunt trip coil. The MCCB (106) is configured to trip automatically and isolate the SCB (104) upon receiving a tripping signal from an inverter control card (110) located in the solar inverter (108). The inverter control card (110) monitors for fault conditions, such as ground faults or short circuits, and transmits a tripping signal to activate the shunt trip coil in the MCCB (106). The system provides automated isolation of the SCB (104) from the solar inverter (108), enhancing safety and reliability in solar power systems.
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Citation Information

Patent Citations

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    CN116435966A

  • Safe operation device for photovoltaic AC combiner box

    CN213426104U

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    WO2012096807A1