Portable Transformer On-load Tap Changer Tester, OLTC Dynamic Resistance & Waveform Analyzer

Portable Transformer On-load Tap Changer Tester, OLTC Dynamic Resistance & Waveform Analyzer

Product Description

On load tap changer is the only moving part connected with the transformer circuit, so the detection of on load tap changer has attracted more and more attention. In the Code for Handover and Preventive Test of Electric Equipment, it is required to check the action sequence of on load tap changer and measure the switching time. The instrument is mainly used to measure the transition waveform, transition time, transient resistance value and three-phase synchronization of transformer on load tap changer.
Product Alias

OLTC Dynamic Resistance Tester / Transformer Tap Changer Analyzer / On-load Tap Changer Waveform Test Set / Transformer OLTC Test Instrument
Features

The instrument has large output current and light weight

Test Yn, Y, D type transformers, and display the resistance value directly without conversion

Measurement with or without winding

The waveform display automatically adjusts the resistance and time value amplitude according to the sampling value

It has perfect protection circuit and strong reliability

Seven inch high brightness touch color LCD, clear display under strong light, full touch screen operation

Built in large capacity lithium battery, no external power supply (optional)

500 groups of data can be automatically saved internally

The instrument can use Android phone or tablet, follow WeChat official account, download special APP, control the instrument through special software, store and upload test data for easy reference

Product Parameters

Application Scenarios

FAQ

Question 1: Abnormal waveform / Distorted OLTC switching waveform
Customer: When conducting on-site testing of transformer on-load tap changer, the displayed switching waveform is severely distorted and cannot get stable curve. What are the possible reasons?
Manufacturer: First check whether the test clamps are tightly clamped on the tap changer terminals, poor contact will introduce extra resistance and distort waveform. Inspect the test cables for damage, aging or internal broken wire. Confirm the transformer is fully power-off and there is no residual voltage on the winding before test. Check if the tap changer mechanical movement is stuck or has poor contact of internal contacts. Reconnect all wires and restart the instrument to test again. If waveform is still abnormal, stop testing and contact technical support. Do not disassemble the instrument casing without authorization.
Question 2: No test data / Failed to collect OLTC signal
Customer: After finishing wiring and starting the test, the instrument cannot capture any signal and no test data is displayed on screen. How to solve this problem?
Manufacturer: Check whether the A/B/C and 0 terminals are connected to the corresponding tap changer wiring points correctly, wrong wiring will lead to no signal collection. Check the power supply of the instrument, confirm the power cord is plugged firmly and AC input voltage is within the rated range. Check if the test cables have open circuit. Confirm the tap changer completes full tap shifting action during the test trigger. Recheck wiring connection and trigger the test again. If no signal can still be collected, stop operation and contact technical support. Never open the equipment for self-maintenance.
Question 3: Large deviation of transition resistance test value
Customer: The measured transition resistance value differs greatly from the historical test record, we suspect the instrument measurement error. What should we check?
Manufacturer: Check the contact surface of test clamps, remove rust, oxide layer and dirt on transformer terminals to guarantee good metal contact. Check whether there are multiple parallel branches or residual charge on transformer windings which affect test results. Verify the instrument has completed self-calibration before formal testing. Check if the tap changer contacts have burning loss, carbon deposition or loose connection. Repeat the test for multiple times to observe data repeatability. If the deviation still exists after inspection, stop test and contact technical team. Do not modify internal circuit of the tester.
Question 4: Instrument touch screen no response / Touch failure
Customer: After powering on the OLTC tester, the screen lights up normally, but the touch function fails and cannot select any menu. How to troubleshoot?
Manufacturer: Check whether the screen surface has water, dust or heavy oil contamination which interfere touch induction, clean screen gently with dry soft cloth. Restart the instrument by cutting off power and re-energize after 2 minutes to eliminate temporary system crash. Confirm there is no external strong electromagnetic interference near the instrument during use. Do not press the screen hard with sharp objects. If touch still cannot work after restart, stop using the device and contact technical support. Do not open the shell to repair touch screen by yourself.
Question 5: Built-in printer cannot print test report / Blank printing paper
Customer: The test finishes successfully and data is saved, but the built-in printer cannot print or outputs blank paper. What causes this issue?
Manufacturer: Open the printer compartment and check whether thermal paper is loaded in correct direction; thermal paper will print blank if installed reversely. Check if the paper roll is stuck or paper is jammed inside printer. Clean the thermal print head with alcohol cotton after power-off to remove dust and carbon residue. Check whether the print command is correctly triggered on the menu. Reload paper and try printing again. If printing still fails, stop operation and contact technical support. Do not disassemble printer module for self-repair.
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.
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