What are the main hazards of short circuits to electrical equipment?

Short circuits pose a significant threat to electrical equipment, primarily because they generate an enormous current (up to tens of times the rated current) instantaneously, leading to a series of destructive consequences.

The enormous short-circuit current generates astonishing heat (proportional to the square of the current). This causes a rapid increase in the internal temperature of the equipment, resulting in:

- Melting and carbonizing of insulation materials, completely losing their insulating ability.

- Melting and even melting of conductors (such as wires and contacts), sometimes pulverizing into flying metal particles.

- Causes electrical fires, one of the most dangerous consequences of short circuits.

A tremendous electromagnetic repulsion or attraction (also proportional to the square of the current) is generated between parallel conductors. This force is sufficient to:

- Cause switch contacts to repel each other, generating a strong, difficult-to-extinguish electric arc.

- Cause rigid busbars to bend, deform, or even tear fixed insulators.

- Directly break or twist the internal mechanical structure of the equipment. 3. Voltage Drop – Interfering with Other Equipment

A short circuit causes a sharp drop in grid voltage. This can cause other equipment on the same power line to.

1.Wires should be securely installed to prevent them from falling off. Wires should not be knotted or tightly hung on wires or nails.

2.The power cords of portable power tools should have a good protective layer to prevent damage or detachment.

3. It is strictly forbidden to insert bare wire ends into sockets.

4.Both the main power switch and branch switches should be equipped with suitable fuses, and the current operation should be checked regularly to eliminate potential hazards promptly.

VTZ-12 vacuum circuit breaker (special model of Tongzhong Electrical Co., Ltd.) is an indoor switchgear for rated voltage 12kV, AC 50/60Hz. It adopts a modular operating mechanism and is suitable for various industrial and mining enterprises, as well as power grid equipment. It can be used as a handcart unit for use with KYN28A-12 switchgear, or as a fixed unit with relevant mechanical interlocking, making it suitable for XGN2 and other fixed cabinets.

1.Wide application range:

the product series has a wide application range, rated currents from 630A to 5000A, and rated breaking currents from 20kA to 50kA. It is suitable for all environments within an altitude of 4500 meters and an operating temperatures from -40°C to 40°C.

2.Supports intelligent customization:

a. It can add a wireless temperature monitoring solution with self-powered design to ensure safety and maintenance-free operation.

b. It has a mechanical characteristics monitoring solution to provide real-time monitoring of circuit breaker operating data for early detection and resolution of potential problems.

c. It has a motorized cabinet entry solution to allow remote operation for ensuring personal safety.

d. Real-time component aging can be detected by partial discharge testing.

Shaanxi West Power Tongzhong Electrical Co., Ltd.

Shaanxi West Power Tongzhong Electrical Co., Ltd. is a leading manufacturer with over 20 years of experience, specializing in high quality 7 to 40.5kV vacuum circuit breakers, switchgears, and a wide range of electrical products. Our advanced manufacturing process ensures reliable, durable solutions, especially our VTZ series vacuum circuit breakers, which are maintenance-free for up to 20 years. With a team of expert technicians, we excel in R&D, manufacturing, and after-sales service for both high and low voltage equipment, delivering excellence at every stage.

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