The high-voltage circuit breaker temperature rise test equipment is a special testing device designed to evaluate the temperature rise performance of high-voltage circuit breakers during operation. It plays a decisive role in ensuring the safe and stable operation of such circuit breakers. The details are described below:
Main Purpose
During current conduction, high-voltage circuit breakers generate heat due to factors such as contact resistance and conductor resistance. Excessive temperature rise can impair the insulation performance of the circuit breaker, accelerate the aging of components, and even lead to failure. This test equipment primarily simulates the actual operating conditions of high-voltage circuit breakers. It measures the temperature rise values of critical components, including contacts, busbars, and enclosures, under rated current or specified overload current conditions. This process verifies that the temperature rise of the circuit breaker complies with relevant standards (e.g., IEC and GB) while identifying potential thermal faults.
Main Technical Features
- Wide current regulation range with high accuracy: The rated currents of high-voltage switches vary. Test equipment typically offers a wide current output range, for example, from 100 A to 5000 A or even higher, and supports continuous adjustment. Current control accuracy is typically between ±0.5% and ±1%. Some advanced devices use true RMS sampling technology to eliminate the effect of current waveform distortion and ensure accurate test data even under non-linear load conditions.
- Comprehensive and sensitive temperature measurement function: it is equipped with multi-channel temperature measurement modules (e.g., 16 channels) that use highly sensitive sensors, such as thermocouples or fibre optic temperature sensors. The temperature measurement resolution can reach 0.1℃ and the sampling frequency is high (e.g., 10 Hz), enabling real-time monitoring of temperature changes at various key points of the switch. The flexible temperature sensors used are resistant to high temperatures (e.g., 300 ℃) and are protected against electromagnetic interference, making them suitable for measuring temperature in the confined spaces inside switches.
- High adaptability: High-voltage circuit breakers are available in different types, such as vacuum circuit breakers and SF6 circuit breakers, with different designs. The test equipment is equipped with adjustable output terminals and connection cables with multiple specifications, which facilitates quick connection to different types of circuit breakers and reduces wiring time.
- Intelligent control and automated testing: it is equipped with an intelligent control system and a high-performance industrial computer, and some use programmable logic controllers (PLCs) as the central processing unit. It supports automatic programming of test procedures with predefined test templates that comply with international and national standards. Users can activate them with a single click. It also has functions such as real-time data display, curve plotting, and automatic alarm in case of failure.
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Reliable and secure protection: Since the test is performed under high current and continuous operation conditions, the test device includes several hardware protection features, such as overload, overvoltage, and overheating protection. When the test parameters exceed the safety threshold, the system can automatically interrupt the output for a short time (e.g., 50 ms) and trigger an alarm. In addition, fireproof insulation materials and independent air ducts are used to prevent risks such as electric arcs and overheating.
Main Areas of Application
1.Factory quality control: Manufacturers of high-voltage switches use it to perform temperature rise tests on products before they leave the factory, ensuring that products meet quality standards and that defective products are discarded in a timely manner.
2.On-site maintenance and testing: Used in electrical power supply systems, such as substations, to perform temperature rise tests on high-voltage switches in operation, helping to detect hidden thermal faults (such as increased contact resistance due to wear) and ensuring the safe operation of the power grid.
3.Product research and development: Provides data for the research and development of new high-voltage switches. Temperature rise tests are used to evaluate the thermal performance of new products and optimize the design of the construction or selection of materials.
