Portable Transformer On‑Load Tap‑Changer Tester For Measuring Transition Resistance & Transition Time

The MYK-I On-Load Tap Changer Parameter Tester is a specialized instrument designed for comprehensive analysis of transformer on-load tap changers. As the only moving part connected to the transformer circuit, proper testing of on-load tap changers is essential for transformer maintenance and reliability.This equipment meets the requirements specified in "Procedures for Handling and Preventive Tests for Electrical Equipment" for checking action sequences and switching times of on-load tap changers.

Product Alias

Transformer On‑Load Switch Tester / Tap‑Changer Analyzer / Transformer Tap‑Changer Detector / On‑Load Tap‑Changer Test Set / OLTC Tester / Tap‑Changer Transition Characteristic Tester / Transformer Tap‑Changer Waveform Analyzer / On‑Load Tap Changer Performance Test Instrument

Features

1.The instrument has large output current and its weight is light;
2.Two-stage current output, wider test range and higher stability;
3.Can automatically calculate the transition resistance value and transition time;
4.It has perfect protection circuit and strong reliability;
5.5.7-inch large LCD display, it's easy for on-site operation;
6.U disk storage function, can store more waveforms data .
7.The keyboard and one-button shuttle are operated independently, which makes the instrument more convenient to operate.

Application Scenarios

FAQ

Question 1: Cannot capture complete tap‑changer transition waveform
Customer: When testing transformer OLTC on‑site, the instrument fails to capture full transition waveform, only partial waveform is displayed. What is the root cause?
Manufacturer: This problem frequently occurs in field substation tests. Please perform step‑by‑step troubleshooting: first, check whether the test clips are firmly connected to tap‑changer terminals, eliminate poor contact or oxidized contact points; second, confirm that the sampling time parameter setting matches actual tap‑changer switching speed; third, inspect test cables for breakage or internal short‑circuit. Avoid strong electromagnetic interference near test wiring. If above operations cannot solve the problem, please contact us promptly and do not open the instrument casing by yourself.
Question 2: Test resistance value deviates greatly from historical reference data
Customer: After completing OLTC transition resistance test, measured resistance value shows obvious deviation compared with previous historical test records. How should we handle this situation?
Manufacturer: Large deviation is generally caused by contact oxidation of tap‑changer contacts, improper wiring connection or parameter mis‑configuration. Please take these measures: Firstly, make sure all test clamps have good metal‑to‑metal contact, clean oxide layer on tap‑changer terminals if necessary. Secondly, double‑check wiring sequence strictly following user manual. Thirdly, confirm test current setting is correct. If the transformer tap‑changer has not been operated for long time, perform several manual tap switching cycles before formal measurement. If deviation still exists, further inspect the internal condition of transformer on‑load tap‑changer.
Question 3: Built‑in printer outputs blank paper or no printing output
Customer: Tap‑changer test data is stored normally, but when triggering print function, printer outputs blank paper or no reaction.
Manufacturer: Open the printer compartment and check thermal paper installation direction, ensure coated side faces print head. Confirm thermal paper roll is not exhausted. Reboot tester device. Never pull paper forcibly to prevent print‑head damage. Replace standard thermal printing paper. If printing function still fails, stop field test and get technical support from our team.
Question 4: Instrument screen freezes or auto‑reboots during continuous testing
Customer: While performing multiple tap‑changer test groups on‑site, touch screen gets stuck, unit restarts unexpectedly and part of saved test records get lost.
Manufacturer: Do not cut off AC power supply during data measuring, saving or printing process. Reboot equipment when screen freezes. Export and back‑up important test data timely. Adopt stable site power source and avoid voltage fluctuation and surge. Keep instrument away from strong electromagnetic interference sources of substation equipment. If frequent crash happens, provide detailed fault phenomenon for our remote technical guidance.
Question 5: Alarm triggers, test cannot be started after power‑on self‑check
Customer: Power‑on self‑check finishes without code error, but instrument pops‑up alarm and refuses to start tap‑changer measurement test.
Manufacturer: Check test wiring terminals are tightly plugged. Confirm input power voltage complies with rated specification. Verify no short‑circuit between test clamps. Remove abnormal fault sources and restart instrument. Repeated alarm indicates potential internal hardware fault. Please discontinue test work and contact manufacturer for service.
Question 6: Shipping Method
Customer: If we place an order, how do you typically ship the goods? Will there be any issues with transporting bulky items such as reactors?
Manufacturer: We default to using dedicated logistics lines or brand-specific express shipping services; small-sized main units and accessories may also be shipped via standard courier services. Large items, such as reactors and excitation transformers, are packed using wooden crates or wooden frames for reinforcement to prevent bumps and moisture exposure during transit; a packing list is included with each package to facilitate item-by-item counting for you. Logistics costs are typically determined by both parties in accordance with the contract terms; after shipment, we will send you both the tracking number and the carrier's contact phone number for easy tracking.If your project site is remote or if delivery to the site is required with a specified logistics company, please inform us in advance when placing your order; we can then coordinate and arrange accordingly.
Question 7: Delivery Lead Time
Customer: Our project is under tight deadlines; how long will it take for the order to be shipped after we place it? Can we request expedited shipping?
Manufacturer: Standard specifications – stock available; typically delivered upon receipt of the order. Orders can be shipped within [X] working days; for non-standard products requiring customized voltage levels, capacities, or reactor combination configurations, the production cycle typically ranges from [X] to [Y] days.The delivery time will be approximately 7-15 working days; the specific timeline shall be subject to the sales confirmation provided upon order placement. If your project has a tight schedule, please inform us of the latest expected delivery date before placing your order; we will first verify the production schedule and inventory status, and where possible, will coordinate expedited production and prioritize shipment. However, it is recommended to allocate sufficient transit time for logistics to avoid delaying on-site testing.
Question 8: After-sales Service and Warranty
Customer: What is the warranty period for this equipment? If any issues arise during on-site use, how will your after-sales service respond?
Manufacturer: We provide a two-year free warranty on the entire unit and lifelong technical support services. During the warranty period, if issues arise due to defects in the equipment itself, we will provide free repair or replacement of components; when problems occur on-site, we commit to responding within 24 hours; most wiring and parameter configuration issues can be resolved through remote guidance via video or telephone; for cases where an on-site visit is necessary, we will arrange for our technicians to arrive at the location to resolve the issue. After the warranty period expires, we still offer repair services, with spare parts supplied at cost price for the long term, and software updates provided free of charge for life. Upon delivery of the equipment, we also offer free operational training (video operation guides)to ensure that your testing personnel can operate the equipment independently and proficiently; should you have any further questions, please feel free to contact our dedicated after-sales hotline directly.
Question 9: Shipping methods for each region (Sea freight)
Customer: Our projects are distributed across several states, and our procurement volumes are substantial; are the shipping methods consistent across all states? How is the delivery time calculated?
Manufacturer: The specifications are identical; however, it should be specifically noted that this equipment set is large in size and heavy in weight—components such as the reactor and excitation transformer are all classified as heavy components. Therefore, regardless of which state or region the shipment is destined for, we will uniformly utilize sea freight transportation. The packaging employs export-grade wooden crates with reinforced structures, along with moisture-proof and rust-proof treatments; the design of these wooden crates is optimized for long-distance sea transport and multiple lifting and transshipment operations. Upon arrival at the destination, simply unpack the goods and conduct an inspection before putting them into use. Regarding delivery time, the sea freight transit period depends on the port of destination: near-sea routes are generally faster, whereas ocean routes may take longer; the exact number of days will be confirmed based on the shipping schedule specified in the bill of lading. We have a dedicated freight forwarding agency to handle booking of shipping space, customs declaration, insurance, and other related procedures; once the vessel departs, we will send you documents such as the bill of lading and the packing list, enabling you to arrange for the receipt of goods at the port of destination and their inland transshipment in advance

Shipping scenario

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Scene (Two)

Attachment Directory

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