On site calibration instruments are not required for all electric field applications, but for specific types of measuring points in the power system, regular on-site calibration is a necessary means to ensure measurement fairness and detect equipment abnormalities. Clarifying the main applicable scenarios can help arrange verification resources and frequency reasonably.
High voltage user metering device
High voltage metering devices connected through current transformers and voltage transformers have a higher probability of errors or ratio deviations compared to low-voltage systems due to the fact that the state of the transformers changes over time and the wiring is complex. The on-site verification instrument can quickly verify the integrity of the measurement circuit without power outage, and is the core tool for annual measurement inspection of high-voltage users.
Distribution transformer outgoing metering point
The outgoing meters in the public transformer substation area may experience degradation in accuracy over time due to long-term operation under high current and complex load conditions, which is also a high-risk point for human intervention. On site verification does not affect the normal use of electricity by users and has high inspection efficiency.
Newly installed or replaced measuring devices
After installing or replacing measuring instruments and transformers, on-site wiring verification and error validation should be carried out to confirm that the wiring is correct and the error is within the allowable range before officially putting them into measurement. If this step is omitted, if there is a wiring error, it may cause long-term measurement deviation and make it difficult to make up for it in the future.
Electricity inspection and auditing occasions
When the electricity inspection personnel of the power supply company conduct on-site inspections of high-voltage or large industrial and commercial users, HZ-3521A can quickly measure on-site electrical parameters, verify vector relationships, and is an important means of obtaining objective data on site.
Power quality monitoring
When it is necessary to simultaneously record power quality parameters such as harmonics, power factor, and voltage fluctuations, the multi parameter measurement and harmonic analysis functions of HZ-3521A can also serve as a convenient tool for initial screening of power quality.