Secondary circuit testing equipment is rapidly evolving towards integration, intelligence, and digitalization, significantly improving the efficiency and safety of power system testing.
Functional Integration: Modern equipment integrates functions such as secondary voltage drop testing, load measurement, and impedance analysis into a single instrument, enabling multiple parameter tests to be completed with a single wiring connection, greatly reducing on-site operation steps and the risk of wiring errors. For example, the testing instrument from Wuhan UHV Electric Power Technology can simultaneously complete PT secondary voltage drop and CT secondary load measurements, improving operational efficiency.
Intelligent Testing: The equipment is equipped with a graphical interface and automated processes, supporting automatic generation of vector diagrams and hexagonal diagrams to help quickly identify wiring polarity errors or phase sequence abnormalities. Built-in diagnostic algorithms can comprehensively evaluate data, automatically determine the source of errors (such as excessive conductor resistance or poor contact), and propose rectification suggestions.
Wireless Communication and Cloud-based Data: Wireless synchronous sampling is achieved using GPS/BeiDou or current zero-crossing signals, avoiding the safety risks associated with long-distance wiring. Some devices support Bluetooth and Wi-Fi transmission, allowing measurement data to be uploaded to mobile terminals or cloud platforms in real time, facilitating trend analysis and predictive maintenance.
Adapting to the Needs of New Power Systems: With the high proportion of renewable energy integration, the equipment needs to have wide-range signal adaptability and operate stably under conditions of high harmonic content and large voltage fluctuations. The hardware and software architecture reserves expansion interfaces to support future added functions (such as merging unit output testing and synchronous phasor measurement).
Optimized Safety and Portability: Lightweight design (e.g., the CZ3140 model weighs only 1.5kg), long-lasting lithium batteries, and dustproof and waterproof casing meet the needs of long-term operation in substations without mains power. Mechanical protection structures (such as automatically retractable detection ports) further enhance the equipment's durability and operational safety.
