On-Load Tap Changer Tester| XHYZ1688
The XHYZ1688 on-load tap changer tester is a specialized instrument designed to measure the transition waveform, transition time, instantaneous transition resistance values and three-phase synchronization of transformer on-load tap changers (OLTC). The on-load tap changer is the only moving part connected to the transformer circuit, so its condition directly affects the safe operation of the entire transformer. According to the Power Equipment Handover and Preventive Test Regulations, the action sequence of the on-load tap changer must be checked and the switching time must be measured regularly. This instrument features a high degree of intelligence with full Chinese menu prompts and simple operation. Its compact size, light weight and strong anti-interference capability greatly reduce the working intensity of field personnel, making it an ideal tool for power generation and supply units as well as transformer manufacturers to ensure safe production and improve product quality.
Applications & Target Audience: Engineered for transformer manufacturers performing factory acceptance and outgoing quality control of on-load tap changers, power plant and utility preventive test teams executing handover and preventive test regulations, OLTC overhaul and maintenance workshops, new substation commissioning and acceptance teams, and electrical installation and commissioning companies that verify tap changer performance before energization.
Key Specifications
| Parameter |
Specification |
| Output Current |
1.0A, 0.5A, 0.2A |
| Transition Resistance Range |
0.3Ω~20Ω (1.0A), 5Ω~40Ω (0.5A), 20Ω~100Ω (0.2A) |
| Transition Time Range |
0~320ms |
| Open Circuit Voltage |
24V |
| Measurement Accuracy |
Transition resistance: ±(5% reading ±0.1Ω); transition time: ±(0.1% reading ±0.2ms) |
| Sampling Rate |
20kHz |
| Data Storage |
500 groups built-in, retained on power failure |
| Display |
7 inch high-brightness LCD |
| Working Temperature |
-10°C to 50°C |
| Working Humidity |
≤85%RH |
| Power Supply |
AC220V±10%, 50±1Hz |
| Dimensions |
Main unit 360mm × 290mm × 170mm; cable box 360mm × 290mm × 170mm |
| Weight |
Main unit 6.15kg; cable box 4.55kg |
Advanced Features
Large output current with light weight, greatly reducing field workload
Tests YN, Y and Δ connected transformers with resistance values displayed directly without conversion
Supports both with-winding and without-winding measurement methods
Waveform display automatically adjusts resistance and time amplitude according to sampling values
Complete protection circuit with high reliability
7 inch large LCD display for convenient on-site operation
Automatically saves up to 500 groups of data internally
Built-in high-speed printer for instant test result printing
USB and RS232 interfaces for data transfer
Filter level and backlight adjustable in system settings for optimum field readability
This instrument provides OLTC testing engineers with a reliable, comprehensive solution for tap changer condition assessment, helping manufacturers, utilities and commissioning teams detect transition resistor faults, spring aging and contact defects before they lead to transformer failures.
FAQ
Q1: Who is this on-load tap changer tester designed for?
It is designed for transformer manufacturers performing factory acceptance and outgoing quality control of on-load tap changers, power plant and utility preventive test teams, OLTC overhaul and maintenance workshops, new substation commissioning and acceptance teams, and electrical installation and commissioning companies that verify tap changer performance before energization.
Q2: What tests can the XHYZ1688 perform?
It measures the transition waveform, transition time, instantaneous transition resistance values and three-phase synchronization of transformer on-load tap changers. It also supports action sequence verification of tap changer switching, satisfying the requirements of the Power Equipment Handover and Preventive Test Regulations for checking action sequence and measuring switching time.
Q3: Can it test different transformer winding connections?
Yes. The XHYZ1688 tests YN, Y and Δ connected transformers, and the resistance values are displayed directly without manual conversion. It supports both with-winding and without-winding measurement methods. For Y-connected transformers without a neutral point lead, two-phase measurement with conversion is supported, and special wiring guidance is provided for Δ connected windings.
Q4: What are the measurement ranges and accuracy?
The output current has three gears of 1.0A, 0.5A and 0.2A. The transition resistance measurement range is 0.3Ω to 100Ω depending on the selected current gear, with accuracy of ±(5% reading ±0.1Ω). The transition time measurement range is 0 to 320ms with accuracy of ±(0.1% reading ±0.2ms), and the sampling rate reaches 20kHz for accurate waveform capture.
Q5: Is the XHYZ1688 convenient for field use?
Yes. The instrument has a 7 inch high-brightness LCD display, full Chinese menu prompts, a built-in high-speed printer, USB and RS232 interfaces, and can automatically save up to 500 groups of data. The main unit weighs only 6.15kg and the cable box 4.55kg, with strong anti-interference capability, making it easy to carry and operate at substations, power plants and manufacturing sites.
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