The transformer on-load switch tester is a comprehensive measuring instrument used to measure and analyze the electrical performance indicators of power transformers and special transformer on-load tap-changers in power systems. It adopts computer control and uses a specially designed measurement circuit to measure the transition time, transition waveform, transition resistance, three-phase synchronicity, and other parameters of the on-load tap changer. Users can measure directly from the tap changer leads according to needs and site conditions, or directly connect the three-phase bushings and neutral points of the transformer to measure. The instrument has functions such as analysis, storage, and printing of measured data. It solves the problem that the current measurement method of the on-load tap changer of the power transformer is backward and there is no special testing method. It can promptly diagnose the potential faults of the on-load tap changer during preventive testing of power equipment and transformer overhaul, which is of great significance to improving the reliability of the power system operation. Advantages of transformer on-load switch tester 1. Strong comprehensive measurement capabilities. The measurement of various numbers of the on-load tap changer can be realized in one instrument. Such as switch selection, whether there are opening and breaking points in the whole switching process, transition waveform, transition time, transition resistance, three-phase synchronization, etc. 2. Comprehensive analysis of measurement results. Users can use the large-screen LCD display and various function buttons to analyze the resistance value of each point in the waveform, the time of each segment, the time of each time segment, and the different phases of the three phases. Through screen analysis, the user can understand the changes in various parameters of the three-phase switch at each moment during the switching process. The waveform can also be printed, stored, and reviewed to analyze and compare historical waveforms. 3. Print the output. The instrument is equipped with a panel-type front paper-changing printer, which can be directly archived as a test report of the switch. 4. Menu driven, flexible operation. All operating functions, prompts and measurement results are displayed on a large 240×128 dot LCD screen. Users only need to press the function keys according to the prompts to perform measurements. 5. The instrument is equipped with anti-shock and overvoltage protection circuits. All external leads of the instrument are fed into the measurement circuit through a protection system, which can prevent damage to the instrument due to instantaneous discharge of large inductance or wiring errors. 6. Has good anti-interference performance. The all-aluminum alloy chassis and instrument are equipped with a power supply noise filter and an anti-interference circuit, which can make reliable measurements at sites with poor power quality and strong electromagnetic field interference. 7. Data retention during power outage. The data and waveforms measured by the user can be saved in the instrument respectively, and the stored content will not be lost due to power outage. It is especially suitable for taking it back to the laboratory for continued analysis and archiving after the field test is completed. 8. This instrument can store up to 16 groups of switching waveforms. Precautions for transformer on-load switch tester To ensure the safety of the operator and the instrument, the manufacturer reminds users to pay attention! ⒈ Be sure to read this manual carefully before using the instrument; ⒉ The operator of the instrument should have common sense in the use of general electrical equipment or instruments; ⒊ This instrument can work normally within the ambient temperature range of -5℃~40℃ and relative humidity ≤80%, but when used outdoors, avoid rain and direct sunlight on the LCD screen; ⒋ The power socket is equipped with a protective ground wire, please insert the plug into the three-pin jack with ground wire. ⒌ The output voltage of the instrument is 24V. During on-site testing, first connect all the leads before turning on the power of the instrument; ⒍ The power must be turned off when changing the clamp of the instrument. The instrument can be measured with a coil, but it is strictly prohibited to measure with power on; ⒎ More than two groups of wires cannot be connected together as one measurement, and unused wires must be left open; ⒏ After the test, turn off the instrument first and then remove all wiring; Main technical specifications of the transformer on-load switch tester: ⒈ Three independent test power supplies, maximum output power 1A; ⒉ The instrument is set to a sampling rate of 10~20KHZ; ⒊ The maximum storage time of a single waveform is 6.4 seconds. ⒋ Transition resistance measurement range: Y/△-type transformer ≤ 40Ω, Y-type transformer ≤ 20Ω. ⒌ Measurement accuracy: △≤10% ⒍ Measurement synchronicity error: 0.2ms. ⒎ Monitor: 240×128T, T6963 controller; ⒏ Printer: MP-40-8 panel front paper-changing printer; ⒐ Processing part: 80C320 high-speed 8-bit microprocessor. Program memory 32K; power-down retention data memory 512K bytes; high-speed A/D converter, sampling rate up to 400KHZ; ⒑ Power supply 220V±10% power ≤200W. ⒒ Size 410mm×320mm. ⒓ Weight ≤7kg
