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MY‑131 Transformer Turns Ratio & Winding Resistance Tester Portable
| Place of Origin | China Mainland |
|---|---|
| Brand Name | MINGYANG |
| Model Number | MY-131 |
| Minimum Order Quantity | 1 |
| Price | 2400USD |
| Packaging Details | carton |
| Delivery Time | 1 week |
| Payment Terms | L/C,D/A,D/P,T/T |
| Supply Ability | 100/Month |
Product Details
| Direct Resistance Test Output Current | 20A,10A,5A,1A,0.1A,≤10mA | Direct Resistance Measuring Range | 20 A:0.5mΩ‑100mΩ;10 A:1.0mΩ‑300mΩ;5 A:10 mΩ‑1.0 Ω;1 A:200mΩ‑6.0 Ω;0.1 A:2.0 Ω‑60 Ω;≤10mA:30 Ω‑50 kΩ |
|---|---|---|---|
| Direct Resistance Test Accuracy | ±(Reading × 0.2% + 2 Words) | Turn Ratio Measuring Range | 0.9‑10000 |
| Turn Ratio Test Accuracy(≤500) | ±(reading × 0.1% + 2 Words) | Turn Ratio Test Accuracy(500‑3000) | ±(reading × 0.2% + 2 Words) |
| Turn Ratio Test Accuracy(＞3000) | ±(Reading × 0.3% + 2 Words) | Turn Ratio Resolution | 0.9‑9.9999(0.0001);10‑99.999(0.001);100‑999.99(0.01);10000 And Above (1) |
| Working Power Supply | Built‑in Lithium Battery, Capacity 7.8AH | Charging Voltage | AC220V |
| Service Temperature | -10ºC~50ºC | Relative Humidity | ≤90%, No Condensation |
| Weight / Dimension | 6.5kg / 318×280×204mm | ||
| Highlight | MY-131 transformer turns ratio tester,portable winding resistance tester,hipot tester with warranty |
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Product Description
MY‑131 Transformer Turns Ratio & Winding Resistance Tester Portable
Product Description
For power systems, transformers are core equipment. Therefore, the long-term and reliable operation of transformers is crucial to the stability and reliability of the entire system.
Currently, DC resistance testing and transformer ratio/vector group testing are mandatory items during transformer outage maintenance. To perform these tests, it is necessary to configure a transformer DC resistance tester and a transformer ratio/vector group tester separately. Each test requires carrying two instruments. Since they are two independent instruments, each equipped with dedicated test leads, testing must be conducted separately, and wiring changes are frequently required during the process, resulting in significant waste of manpower, resources, and working hours.
Our company has innovatively developed a dual-function distribution transformer testing system (DC resistance + ratio) powered by a high-capacity lithium battery. With just one set of equipment, we can complete both test items without the need for frequent disconnection and reconnection of test leads.
Features
Currently, DC resistance testing and transformer ratio/vector group testing are mandatory items during transformer outage maintenance. To perform these tests, it is necessary to configure a transformer DC resistance tester and a transformer ratio/vector group tester separately. Each test requires carrying two instruments. Since they are two independent instruments, each equipped with dedicated test leads, testing must be conducted separately, and wiring changes are frequently required during the process, resulting in significant waste of manpower, resources, and working hours.
Our company has innovatively developed a dual-function distribution transformer testing system (DC resistance + ratio) powered by a high-capacity lithium battery. With just one set of equipment, we can complete both test items without the need for frequent disconnection and reconnection of test leads.
Product Alias
transformer turns ratio and winding resistance tester / transformer ratio & dc winding resistance integrated tester / portable transformer turn ratio tester / transformer dc resistance test instrument / transformer comprehensive test setFeatures
1,One connection, can complete the direct resistance test, variable ratio test.
2,Direct resistance test function, for Yn, Y and winding can be tested in three-phase automatic way, and calculate the three-phase unbalance rate; The maximum output current is 20A, which can meet the very low resistance test of the low-voltage coil of the distribution network transformer.
3,Variable ratio test function, with three-phase, single-phase, Z-type transformer test function; PT/CT variable ratio and polarity test function; Blind test function.
4,With a variety of wired and wireless communication interfaces, convenient instrument function expansion.
5,The instrument adopts embedded Linux operating system, which has high security, fluency and ease of use.
6,The instrument adopts A7+M4 dual-core architecture, which meets the real-time measurement and the smooth operation.
7,Industrial 7 inch large screen display, fresh and simple display style design, for you to create a comfortable and convenient human-computer interaction experience.
8,This instrument uses large capacity lithium battery power supply, built-in charger.
Product Parameters
| Direct resistance test | ||
| Output current | 20A,10A,5A,1A,0.1A,≤10mA | |
| Measuring range | 20 A range 0.5mΩ~ 100mΩ 10 A range 1.0mΩ~ 300mΩ | |
| 5 A range 10 mΩ~ 1.0 Ω 1 A range 200mΩ~ 6.0 Ω | ||
| 0.1 A range 2.0 Ω~ 60 Ω ≤10mA range 30 Ω~ 50 kΩ | ||
| Accuracy | ±(Reading x 0.2% + 2 words) | |
| Turn ratio test | ||
| Measuring range | 0.9~10000 | |
| Accuracy | ±(reading x 0.1% + 2 words)(500 or less) | |
| ±(reading x 0.2% + 2 words)(greater than 500 less than or equal to 3000) | ||
| ±(Reading x 0.3% + 2 words)(> 3000) | ||
| Resolution | 0.9~9.9999(0.0001) 10~99.999(0.001) | |
| 100~999.99(0.01) | ||
| 10000 and above (1) | ||
| Conditions of use and appearance | ||
| Working power supply | Built-in lithium battery, capacity 7.8AH | |
| Charging voltage | AC220V | |
| Service temperature | -10ºC~50ºC | |
| Relative temperature | ≤90%, no condensation | |
| Weight/size | 6.5kg/318×280×204mm | |
Application Scenarios
FAQ
Question 1: The turns ratio test result is unstable
Customer: When testing transformer turns ratio, the reading keeps jumping and unstable. What should I check?
Manufacturer: Check whether test cables are firmly connected without oxidation or loose terminals. Confirm transformer tap position is set correctly. Keep test leads away from high‑voltage interference cables. Re‑connect all clamps and repeat measurement. If problem remains, contact our support. Do not open the case.
Question 2: Winding resistance test takes too long
Customer: DC winding resistance measurement spends very long time. Is this normal?
Manufacturer: For large‑capacity transformer windings with high inductance, charging‑demagnetizing takes longer time, which belongs to normal phenomenon. Please wait for the full test cycle, do not cut power during testing to avoid instrument damage.
Question 3: Printer cannot print reports
Customer: Test finished but built‑in printer fails to output paper.
Manufacturer: Check whether thermal paper is loaded correctly and paper is not jammed. Confirm printer power is enabled in touch‑screen setting. Replace new thermal paper roll if paper is used up.
Question 4: No response after power‑on
Customer: Power connected, instrument screen does not light up.
Manufacturer: Check power cord connection and power supply voltage. Check the power switch and fuse inside the instrument interface. If fuse blown, replace with specified specification fuse. If still no response, contact technical service, do not disassemble.
Question 5: Transportation & Operation Notes
Customer: What should be noticed for field operation and transportation?
Manufacturer: Keep the instrument in dry environment, avoid heavy drop and impact. Disconnect all test wires before power‑off and moving. Test must be performed on fully power‑off and discharged transformer. Follow local power safety rules. Read user manual before first use.
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
FAQ
Question 1: The turns ratio test result is unstable
Customer: When testing transformer turns ratio, the reading keeps jumping and unstable. What should I check?
Manufacturer: Check whether test cables are firmly connected without oxidation or loose terminals. Confirm transformer tap position is set correctly. Keep test leads away from high‑voltage interference cables. Re‑connect all clamps and repeat measurement. If problem remains, contact our support. Do not open the case.
Question 2: Winding resistance test takes too long
Customer: DC winding resistance measurement spends very long time. Is this normal?
Manufacturer: For large‑capacity transformer windings with high inductance, charging‑demagnetizing takes longer time, which belongs to normal phenomenon. Please wait for the full test cycle, do not cut power during testing to avoid instrument damage.
Question 3: Printer cannot print reports
Customer: Test finished but built‑in printer fails to output paper.
Manufacturer: Check whether thermal paper is loaded correctly and paper is not jammed. Confirm printer power is enabled in touch‑screen setting. Replace new thermal paper roll if paper is used up.
Question 4: No response after power‑on
Customer: Power connected, instrument screen does not light up.
Manufacturer: Check power cord connection and power supply voltage. Check the power switch and fuse inside the instrument interface. If fuse blown, replace with specified specification fuse. If still no response, contact technical service, do not disassemble.
Question 5: Transportation & Operation Notes
Customer: What should be noticed for field operation and transportation?
Manufacturer: Keep the instrument in dry environment, avoid heavy drop and impact. Disconnect all test wires before power‑off and moving. Test must be performed on fully power‑off and discharged transformer. Follow local power safety rules. Read user manual before first use.
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
Scene (One)
Scene (Two)
Attachment Directory
| English Name | Quantity |
|---|---|
| MY‑131 Tester Main Unit | 1 set |
| Yellow portable protective hard case | 1 pc |
| Spare black protective case (optional) | 1 pc |
| Power cord | 1 pc |
| Turns ratio test cable group (Red‑Yellow‑Green‑Black) | 1 set |
| Winding resistance test cable with alligator clips | 1 set |
| Thin signal test wire | 1 pc |
| Thermal printer paper | 2 rolls |
| Fuse tube | 3 pcs |
| User manual & calibration certificate | 1 set |
Attachment Image
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