Portable Transformer Onload Tap Changer Tester OLTC Analyzer with APP Remote Control & Built-in Battery

Product Description

on-load tap changer tester is used to test the switching state of the on-load tap changer. On-site staff can test the performance of on-load tap changers of various power transformers without disassembling the transformer and hoisting the switch, and display and print the waveform and parameters of the transition process.

Product Alias

Transformer On‑Load Tap‑Changer Tester / OLTC Tester / On‑Load Tap Changer Characteristic Analyzer / Power Transformer Tap‑Switch Test Set

Features

1.The instrument has large output current and light weight
2.Test Yn, Y, D type transformers, and display the resistance value directly without conversion
3.Measurement with or without winding
4.The waveform display automatically adjusts the resistance and time value amplitude according to the sampling value
5.It has perfect protection circuit and strong reliability
6.Seven inch high brightness touch color LCD, clear display under strong light, full touch screen operation
7.Built in large capacity lithium battery, no external power supply (optional)
8.500 groups of data can be automatically saved internally
9.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 or fluctuating transition resistance test results during field measurement
Customer: When testing transformer on‑load tap‑changer on‑site, the measured transition resistance value keeps fluctuating and cannot get stable reading. What may cause this problem and how should I handle it?
Manufacturer: First, confirm the transformer has been fully power‑off and completed sufficient discharge; residual induced voltage will cause unstable resistance reading. Second, check all test clip contact points, remove paint, rust and oxide layer on tap‑changer terminal to ensure reliable metal‑to‑metal connection. Loose or poor contact will bring floating data. Third, keep test cables far away from high‑voltage busbars and power cables to avoid strong electromagnetic interference. Check whether test leads are damaged or internally broken. Re‑connect all terminals and perform retest. If data is still abnormal, please send us test waveform screenshot and site condition for further analysis, do not modify internal device parameters without technical guidance.
Question 2: No valid waveform displayed after tap position switching operation
Customer: I have finished wiring correctly and operated tap‑changer to complete gear switching, but the tester shows no effective switching waveform. Transformer is de‑energized. How to troubleshoot?
Manufacturer: Check whether signal test cables are connected to correct OLTC signal terminals, wrong terminal connection will lead to no waveform output. Confirm tap‑changer completes full switching action, partial or incomplete tap movement cannot trigger waveform collection. Check test leads for open‑circuit damage. Restart instrument and start new measurement cycle after tap‑changer returns to stable gear. If the issue persists, you can check hardware channel status in system menu and contact our technical support team.
Question 3: Built‑in thermal printer outputs blank paper or fails to print test report
Customer: Test data and waveform display normally on touch screen, but printer outputs blank sheet or does not feed paper when clicking print command.
Manufacturer: Open printer compartment and verify thermal paper installation direction. The thermal sensitive side must face the print head; reversed paper will print blank page. Clear paper scraps and foreign objects stuck inside printer slot. Make sure you save the complete test record before printing; unsaved temporary test data cannot trigger print task. Reboot tester and retry printing. If printer still malfunctions, please contact after‑sales service, do not disassemble printer module by yourself.
Question 4: Cannot export stored test data via USB flash drive
Customer: Hundreds of groups of OLTC test data have been saved in local memory. When I insert USB flash drive for data export, instrument cannot recognize USB storage device and export fails.
Manufacturer: This tester only supports FAT32 format USB flash disk. NTFS / exFAT format will not be recognized. It is recommended to use USB drive capacity ≤32GB; high‑capacity large‑size USB disks may cause compatibility failure. Make sure USB drive is fully inserted into USB port. You must complete saving test records before export operation, unfinished test records cannot be exported. Re‑format flash drive to FAT32 and try export again. If the problem still exists, provide system interface screenshot for our technical support.
Question 5: Mobile APP cannot connect with tester for remote control and data upload
Customer: I install the dedicated Android APP, but mobile phone cannot establish communication connection with OLTC tester.
Manufacturer: Confirm instrument Wi‑Fi hotspot function is enabled. Turn on Android device Wi‑Fi and connect to the hotspot signal transmitted by tester. Check whether mobile phone system version meets APP running requirement. Close other irrelevant Wi‑Fi connections on your mobile device. Restart both instrument and mobile APP, then rebuild connection. Please note this APP only supports Android system, iOS system is not compatible. If connection still fails, check device network setting and contact technical support.
Question 6: Low battery warning pops‑up when working with built‑in lithium‑battery mode
Customer: I use the internal lithium‑battery for field test without external AC power supply, the screen pops‑up low‑power warning and instrument shuts‑down automatically.
Manufacturer: The built‑in large‑capacity lithium battery needs full charge before outdoor field operation. Please complete full charging under AC power for about 6‑8 hours. Avoid long‑term full‑discharge storage which will damage battery life. If battery drains quickly after full charge, the battery cell may be aging, please contact after‑sales for battery replacement guidance. When available, use external AC power supply for long‑time continuous field testing.
Question 7: 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 8: 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 9: 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 10: 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

Scene (One)

Scene (Two)

Attachment Directory

Attachment Image