When selecting between parallel or series connection methods for surge protectors (SPDs), the decision should be based on specific application scenarios and requirements. Both parallel and series connections are common configurations, each offering distinct advantages and suitable applications.

Parallel Connection
In a parallel configuration, multiple SPDs are connected simultaneously to the power lines of the protected equipment. This approach provides:

1.Higher current capacity and lower grounding resistance

2.Better distribution and mitigation of lightning surges

3.Enhanced overall lightning protection for the system

4.Redundancy and failover capability: If one SPD fails, others continue to protect the equipment.

Series Connection
In a series configuration, multiple SPDs are connected sequentially along the power lines. This method offers:

1.Higher voltage withstand capability for high-voltage scenarios

2.Cascaded protection, where each SPD handles a portion of the surge energy

Factors to Consider When Choosing Between Parallel and Series Connections

Applications for Parallel Connections

1.Low-voltage power systems
Parallel-connected SPDs are commonly used in low-voltage systems to share surge energy and protect equipment from lightning damage.

2.Communication systems
Multiple SPDs are often installed on telephone or network lines to shield communication devices.

3.Voltage-sensitive electronics
Parallel configurations protect sensitive equipment like computers and servers by optimizing surge energy distribution.

Applications for Series Connections

1.High-voltage transmission lines
Series connections are preferred for high-voltage lines to ensure voltage withstand capability against intense lightning strikes.

2.High-voltage equipment protection
Critical equipment like transformers and generators may require series-connected SPDs for enhanced voltage tolerance.

3.Specialized scenarios
Systems requiring cascaded protection or extreme voltage resistance may adopt series configurations.

Conclusion
Parallel connections generally suit most standard lightning protection needs, offering robust overall protection. Series configurations are reserved for specialized applications requiring high voltage tolerance or cascaded protection. The optimal choice depends on specific scenarios, equipment specifications, and system design requirements. When deciding between parallel and series SPD connections, consulting professional electrical engineers or lightning protection experts is strongly recommended to ensure system reliability and safety.