What is BS EN 61558-2-7:2018?

BS EN 61558-2-7:2018 is a technical standard that specifies safety requirements and test methods for isolating transformers for general applications, with rated output voltage not exceeding 1 000V AC at 50 Hz or 60 Hz. This standard is part of the IEC 61558 series, which covers safety of power transformers, power supplies, and similar products.

Importance of BS EN 61558-2-7:2018

Adhering to BS EN 61558-2-7:2018 is crucial for ensuring the safety and reliability of isolating transformers used in various industries and applications. Compliance with this standard helps to protect users from electric shock, fire hazards, and other potential risks associated with working around electrical equipment. It also ensures that the performance and functionality of these transformers meet acceptable standards.

Key Safety Requirements

BS EN 61558-2-7:2018 outlines several key safety requirements that isolating transformers must meet:

Creepage distances and clearances: The standard provides guidelines on minimum distances to prevent arcing and ensure insulation integrity.

Dielectric strength: Transformers should be capable of withstanding high voltages without breakdown or insulation failure.

Thermal performance: The standard specifies temperature limits to prevent overheating and damage to the transformer or surrounding components.

Mechanical strength: Transformers must withstand mechanical stress and vibrations typically encountered during transportation and operation.

Protection against environmental factors: The standard addresses protection against dust, humidity, and other environmental conditions that could affect the transformer's performance and operation.

Testing Methods

BS EN 61558-2-7:2018 also provides detailed testing procedures to assess the compliance of isolating transformers. Some of the common test methods include:

Insulation resistance measurement: This test determines the ability of the transformer's insulation to prevent leakage of current.

Dielectric strength test: Transformers are subjected to high voltage levels to check their ability to withstand electrical stress.

Temperature rise test: This evaluates the ability of transformers to dissipate heat and avoid excessive temperature rise during operation.

Short-circuit test: Transformers are tested under short-circuit conditions to ensure that they can handle such events without failure or damage.

Environmental test: Transformers undergo various environmental simulations to assess their performance under different conditions.

Complying with BS EN 61558-2-7:2018 not only ensures the safety of isolating transformers but also helps in meeting legal and regulatory requirements. It is crucial for manufacturers, suppliers, and users of these transformers to stay updated and adhere to the latest standards to maintain a safe working environment.