Blocking Voltage Technology: Circuit and Equipment Protection

Blocking voltage is a key concept in the field of power systems and electronic equipment. It refers to the highest voltage that can reliably interrupt the flow of current. To maintain the stable operation of the power system and ensure the safety of the equipment, understanding and mastering the blocking voltage is crucial. In the following, we will discuss in detail the definition of blocking voltage, influencing factors, measurement methods and its applications in various fields.

Factors affecting blocking voltage
Blocking voltage is affected by many factors, including but not limited to the following aspects:

1. System voltage: System voltage refers to the rated voltage of the power system where the circuit or electrical appliance is located. Normally, to ensure reliable current interruption, the blocking voltage should be much higher than the system voltage.

2. Load characteristics: Different types of loads have different requirements for voltage cutoff in the circuit. Inductive loads and capacitive loads exhibit different characteristics when current is cut off.

3. Circuit breaker or switch characteristics: Different circuit breaker or switch designs and characteristics will affect the blocking voltage. Different application requirements may require circuit breakers or switches with different blocking voltage ratings.

4. Environmental conditions: Environmental conditions such as temperature and humidity will also have a certain impact on the blocking voltage. Especially under extreme conditions, the blocking voltage may change.

How to measure blocking voltage
Typically, blocking voltage is determined through experimental testing, here are some common measurement methods:

Transient overvoltage test: This is a common method of measuring blocking voltage. The blocking voltage is determined by applying a sudden overvoltage to the circuit and observing whether the circuit breaker or switch can reliably cut off the current.

Long-term withstand voltage test: This is another method of measuring blocking voltage. The ability to block voltage is judged by placing the circuit or equipment at the rated voltage for a long time and observing whether the circuit breaker or switch can reliably maintain normal operation.

Areas of application for blocking voltages
Blocking voltage has important applications in many fields, including but not limited to the following aspects:

Power system: In power systems, blocking voltage is a key indicator to ensure the safe operation of circuits and equipment. Circuit breakers and switches in power systems must be able to reliably cut off excessive voltage to protect loads and equipment from damage.

Industrial automation: In the field of industrial automation, various equipment and control systems need to cut off and control current. The concept and measurement methods of blocking voltage are widely used in the design and testing of these devices and systems.

Electronic Equipment: In the field of electronic equipment, understanding blocking voltage is important to protect electronic components and circuit boards. Reasonable selection of blocking voltage can effectively prevent damage caused by overvoltage.

Medical equipment: Medical equipment usually requires current cutting and control to ensure safety and reliability. The application of blocking voltage is of great significance in medical equipment, such as operating room equipment, monitoring instruments, etc.

New energy field: With the development of new energy technologies, such as wind power generation and solar power generation, blocking voltage plays a key role in inverters and grid connection devices to ensure the safe and stable transmission of electric energy.