XT-106 Xutongyongfu DC Impulse Insulation Tester for Inter-Turn Winding Integrity Testing

Overview

The XT-106 DC Impulse Insulation Tester is a purpose-built diagnostic instrument engineered for non-destructive evaluation of inter-turn insulation integrity in stator windings of rotating electrical machines—including induction motors, synchronous motors, and power transformers. Unlike conventional megohmmeters or hipot testers that assess bulk insulation resistance or dielectric strength under steady-state DC or AC stress, the XT-106 applies controlled high-voltage impulse waveforms (typically damped oscillatory or rectangular pulses) to detect localized insulation weaknesses—such as partial discharges, micro-cracks, or degraded varnish—before they evolve into catastrophic turn-to-turn short circuits. Its core measurement principle relies on comparative waveform analysis: a reference pulse is injected into a known-good winding; subsequent pulses applied to the test winding are captured and digitally superimposed. Deviations in pulse shape, decay time constant, or peak amplitude indicate asymmetry in inductance-capacitance distribution—direct evidence of inter-turn insulation degradation. This method conforms to IEEE Std 522-2022 (Guide for Diagnostic Field Testing of Electrical Equipment) and aligns with maintenance practices specified in IEC 60034-27-2 (Rotating Electrical Machines – Part 27-2: Off-line Partial Discharge Measurements on Rotating Electrical Machines).

Key Features

• Integrated dual-mode display: analog pointer gauge for real-time voltage trend monitoring and high-resolution digital LCD for precise DC output reading (14 kV ±1.5%) and elapsed test time
• Zero-position mechanical and electronic interlock prevents inadvertent high-voltage activation—compliant with IEC 61010-1 safety requirements for electrical equipment for measurement, control, and laboratory use
• Automatic discharge circuit with visual status indicator ensures residual energy dissipation within <2 s after test termination, meeting NFPA 70E arc-flash safety protocols
• Programmable timing alarm (adjustable 1–99 s) with simultaneous audible tone and red LED flash for operator alerting during extended impulse sequences
• Robust industrial chassis with reinforced epoxy-coated steel enclosure (IP2X ingress protection), designed for field deployment in turbine halls, substation switchyards, and motor repair shops
• Modular high-voltage generator section rated at 200 VA continuous duty, thermally stabilized to maintain voltage regulation across ambient temperatures from −5 °C to +40 °C

Sample Compatibility & Compliance

The XT-106 accommodates stator windings from low-voltage (≤690 V) up to medium-voltage (≤15 kV class) rotating machines, including form-wound and random-wound configurations. It supports both star (Y) and delta (Δ) connected windings via configurable three-terminal test leads with insulated alligator clips and HV-rated silicone-jacketed cables (rated to 20 kV RMS). The instrument meets electromagnetic compatibility (EMC) requirements per IEC 61326-1 (industrial environment) and carries CE marking under the Low Voltage Directive (2014/35/EU). Its test methodology is referenced in national technical standards GB/T 20140-2016 (Inter-turn Insulation Test Methods for AC Motors) and is routinely accepted by third-party certification bodies during ISO 55001 asset management audits.

Software & Data Management

While the XT-106 operates as a standalone benchtop instrument, optional USB-to-serial interface enables connection to Windows-based diagnostic software (sold separately). This software captures impulse waveforms at 10 MS/s sampling rate, performs FFT-based spectral comparison, and generates compliance reports compliant with ISO/IEC 17025 documentation requirements. Audit trails include operator ID, timestamp, test voltage, duration, pass/fail threshold settings, and waveform signature hashes—supporting FDA 21 CFR Part 11 electronic record integrity where integrated into regulated maintenance workflows.

Applications

• Predictive maintenance screening of critical motors in power generation facilities (e.g., boiler feed pumps, condensate extraction units)
• Factory acceptance testing (FAT) of new or rewound stators prior to commissioning
• Root-cause analysis following unexplained motor tripping events or elevated vibration signatures
• Condition assessment of aging assets in petrochemical plants operating under thermal cycling and contamination exposure
• Verification of insulation system integrity after transport, installation, or mechanical overhaul

FAQ

What voltage waveform does the XT-106 generate for inter-turn testing?

It delivers damped oscillatory impulses with peak amplitude adjustable up to 14 kV DC, rise time <1 µs, and decay time constant optimized for detection sensitivity across typical stator L/C values.
Can the XT-106 be used on energized equipment?

No. All tests must be performed on de-energized, isolated, and properly grounded windings in accordance with NFPA 70E Article 120 and OSHA 1910.333(c)(2).
Does the instrument support automated pass/fail decision logic?

The base unit provides visual/audible alerts only. Pass/fail thresholds and waveform deviation analytics require the optional PC software module.
Is calibration traceable to national standards?

Yes—factory calibration is performed using NIST-traceable high-voltage dividers and certified reference meters, with full calibration certificate provided upon shipment.
What safety certifications does the XT-106 hold?

CE marked per 2014/35/EU (LVD) and 2014/30/EU (EMC); complies with IEC 61010-1:2010 Ed.3 for measurement category CAT III 300 V pollution degree 2 environments.