Fault dynamic recording time: Record the recording data of 0.04-0.5S before the fault (user can set the time) and 3-20S after the fault, with a sampling frequency of 5kHZ. If the system experiences oscillation, record the envelope value for 10 minutes, with one record every 0.1 second interval in the first 5 minutes and one record every 1 second interval in the last 5 minutes The device needs to be equipped with a large capacity of storable memory, which can store at least 1500 sets of data. Configure a USB interface to facilitate user extraction of data and information
Data analysis software with * * * is required for users to analyze recorded data
2.1.1 Fault start method
The fault start method includes analog start, switch start, start based on protection principle, and manual start.
. There are measures in program design to prevent false starts, such as preventing the occurrence of false starts when transformers are put into operation1. Analog quantity startup
1) Positive sequence quantity startup: including sudden variable startup of positive sequence voltage and positive sequence current, as well as positive sequence voltage overvoltage startup or low voltage startup
2) Negative sequence startup: including sudden changes in negative sequence voltage and current, as well as steady-state startup
3) Zero sequence startup: including sudden and steady-state startup of zero sequence voltage and/or zero sequence current
4) DC voltage and current start: taken from the monitoring quantities in the system, such as the voltage and current transformed by pressure sensors, temperature sensors, DC converters, etc
5) Oscillation start: including frequency difference start and frequency change rate start
6) Other starts: Any input analog quantity can be used as the starting quantity, and the starting methods include sudden variable start and steady-state start (excessive or insufficient)
2. Switching value start
Any one or multiple switching values can be set as the starting value. The switch activation can be selected as either switch closed or switch open activation
3. Manual start
2.1.2 Comprehensive analysis of data
a. Using a graphical interface.
b. Stable and transient data can be displayed on the same screen and analyzed uniformly.
C. With editing function, it provides analysis tools such as waveform display, stacking, combination, comparison, and adding annotations, and can be selected for printingFunction of testing report:
1. Project bidding: Issue authoritative third-party CMA/CNAS qualification report
2. Online e-commerce platform entry: Quality inspection report recognized by major e-commerce platforms 3. Used as a sales report: issuing legally effective testing reports to make consumers more confident 4. Papers and research: Provide professional personalized testing needs 5. Judicial services: providing scientific, fair, and accurate testing data 6. Industrial problem diagnosis: Verify the troubleshooting and correction of industrial production problemsBaijian and testing process:
1. Telephone communication and confirmation of requirements
2. Recommend solutions and confirm quotations 3. Mail samples and arrange testing 4. Progress tracking and result feedback 5. Provide reports and after-sales service 6. If urgent or priority processing is requiredTesting and testing characteristics:
1. The testing industry is fully covered, meeting different testing needs
2. Fully cover the laboratory and allocate localized testing nearby3. Engineers provide one-on-one services to make testing more accurate
4. Free initial testing, with no testing fees charged
5. Self service order delivery for free on-site sampling
6. Short cycle, low cost, and attentive service 7. Possess authoritative qualifications such as CMA, CNAS, CAL, etc 8. The testing report is authoritative and effective, and is generally used in China