HZAQ-Y3 Automatic Insulating Rod Withstand Voltage Test Set
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HZAQ-Y3 Automatic Insulating Rod Withstand Voltage Test Set
The HZAQ-Y3 Insulating Rod Withstand Voltage Test Stand is an 8-station specialized mechanical and electrical test frame engineered for routine preventive dielectric withstand testing of live-line working tools-specifically insulating operating rods, high-voltage hot sticks, measuring rods, and grounding sticks.
Diagnostic Purpose & Critical Problems Solved
Insulating rods and hot sticks serve as the primary life-safety barrier protecting high-voltage line workers during energized maintenance and switching operations. During field use, storage, and transport, insulating tools are inevitably exposed to mechanical abrasions, internal moisture absorption, surface tracking, and structural micro-cracks.
Under power-frequency high voltage, degraded rods can experience dielectric breakdown or flashover, creating direct phase-to-ground or phase-to-phase arc faults that threaten line personnel's lives. Electrical utility safety codes (such as DL/T 976, IEC 60855, and IEEE 978) mandate rigorous periodic AC withstand voltage tests (overall and sectional) on all live-line insulating poles.
Testing multiple long hot sticks manually with improvised laboratory supports leads to inconsistent electrode spacing, corona discharge distortions, high risk of surface scratching, and low throughput. The HZAQ-Y3 resolves these issues by providing 8 standardized test stations with stepless distance adjustments. Operating up to 100 kV in standard mode and 200 kV in voltage-doubling mode, it enables safety inspection laboratories to perform standardized, repeatable, and high-efficiency withstand testing across voltage classes from 10 kV up to 500 kV.
Target Testing Applications
Electric Power Safety Tool Testing Laboratories: Periodic annual/semi-annual dielectric withstand inspections for utility line-working departments.
Power Transmission & Distribution Companies (10 kV – 500 kV): Commissioning acceptance testing for newly procured live-line insulating hot sticks and operating poles.
Live-Line Working Technical Training Centers: Hands-on proof-testing and electrical safety verification of lineman toolsets.
Safety Tooling & Hot Stick Manufacturing Plants: End-of-line factory proof testing and quality certification prior to dispatch.
Electrified Railway & Heavy Industrial Substations: Scheduled safety tool dielectric inspections for metro, high-speed rail, and industrial electrical maintenance crews.
Technical Specifications
| Parameter | Specification Value | Testing & Engineering Notes |
|---|---|---|
| Model | HZAQ-Y3 | 8-Station insulating rod dielectric withstand test frame |
| Rated Test Voltage (Standard Mode) | 100 kV AC / DC | - 35 kV insulating rods: Full-length overall withstand test - ≤110 kV≤110 kV insulating rods: Sectional withstand test |
| Voltage Doubling Mode (Cascade Mode) | 200 kV AC / DC | - 63 kV / 66 kV insulating rods: Full-length overall withstand test - ≤500 kV≤500 kV insulating rods: Sectional withstand test |
| Number of Test Stations | 8 Stations | Simultaneous parallel testing of up to 8 insulating rods |
| Electrode Spacing Adjustment | Arbitrary / Continuous stepless | Smooth glide adjustment matching various pole segment lengths |
| Applicable Rod Diameter | Accommodates standard diameters | Standard adjustable spring-loaded clamping electrodes |
| Structure & Support Material | High-grade epoxy / polymer insulation | Superior mechanical rigidity and high tracking resistance |
| Electrode Contact Design | Corona-free rounded annular metal electrodes | Minimizes field emission and partial discharge distortion |
| Grounding & High-Voltage Terminals | Dedicated high-voltage bus and solid ground bar | Ensures equipotential voltage distribution across all 8 stations |
| Operating Ambient Temperature | -10 ℃ ~ +50 ℃ | Standard indoor laboratory & test bay conditions |
| Operating Ambient Humidity | ≤ 85% RH (Non-condensing) | Dry indoor environment recommended for high-voltage testing |
Compliance & Safety Standards
| Standard Reference | Standard Title & Focus Area | Application to HZAQ-Y3 Withstand Testing Routine |
|---|---|---|
| DL/T 976-2017 | Preventive test code for live working tools, devices and equipment | Prescribes test voltages, test durations (typically 1 min), and electrode spacing for overall and sectional hot stick testing |
| DL/T 1476-2015 | Preventive test code for electric power safety tools and instruments | Mandates periodic dielectric acceptance criteria and limits for utility electrical safety tools |
| IEC 60855-1 | Live working - Insulating foam-filled tubes and solid rods - Part 1: Tubes and rods | International standard for dielectric performance, surface tracking resistance, and high-voltage withstand proof tests |
| ASTM F711 | Standard Specification for Fiberglass-Reinforced Plastic (FRP) Rod and Tube Used in Live Line Tools | Standardized dielectric proof-testing procedures for fiberglass insulating poles (100 kV per 30 cm) |
| IEEE Std 978 | IEEE Guide for In-Service Maintenance and Testing of Live-Line Tools | In-service testing guidelines, electrode configurations, and leakage current measurement recommendations |
FAQ
What is the difference between an overall withstand test and a sectional withstand test for insulating rods?
An overall withstand test evaluates the full operational insulating length of the hot stick in one sequence. Under DL/T 976, complete 35 kV insulating rods are tested at 100 kV AC for 1 minute, and 63 kV / 66 kV rods are tested at 200 kV AC for 1 minute. A sectional withstand test is used for longer rods rated 110 kV, 220 kV, 330 kV, and 500 kV, when the rod exceeds the length or voltage limit of a standard test transformer. The rod is divided into segments of typically 0.4 m to 1.0 m, and each section is tested at the rated segmental voltage, such as 100 kV or 200 kV. The HZAQ-Y3 supports both modes on its adjustable rails.
How does the HZAQ-Y3 switch between 100 kV standard mode and 200 kV voltage-doubling mode?
In 100 kV standard mode, the test stand uses a single high-voltage feed and a grounded return. In 200 kV voltage-doubling, or cascade, mode, the stand is set up with dual-bushing balanced or cascaded test transformers, applying +100 kV on one terminal and −100 kV on the opposite electrode. The potential difference across the test span is then 200 kV, while clearance requirements remain manageable.
Why is stepless distance adjustment critical for insulating-rod testing?
Live-working poles vary widely by voltage class and manufacturer. A 10 kV stick needs a short effective test length, while 35 kV, 110 kV, and 220 kV sectional spans must match the code dimensions exactly. Stepless adjustment lets the technician slide the electrode collars to the required millimeter length, without being limited to fixed notch positions.
What criteria determine a pass on the insulating-rod withstand-voltage test?
Per DL/T 976, DL/T 1476, and IEC 60855, the sample must withstand the specified test voltage, such as 100 kV or 200 kV, for 1 minute without disruptive discharge, air flashover, or internal puncture. Immediately after power-down, the rod surface must show no localized overheating by touch or infrared thermometer. Warm spots indicate internal dielectric loss or moisture absorption and constitute a failure.
Can the HZAQ-Y3 measure leakage current for each rod individually?
The standard HZAQ-Y3 frame uses a common grounding busbar. For laboratories that need per-pole leakage-current data, an optional multi-channel digital microammeter kit can be added, so leakage current is measured independently on all 8 stations at the same time.
What laboratory clearances are required at 100 kV and 200 kV?
Testing at 100 kV and 200 kV produces intense electric fields. The HZAQ-Y3 must be installed inside an interlocked high-voltage test cage. Clearance from energized electrodes to walls, metal ceiling structures, and ground meshes must follow high-voltage laboratory safety rules: at least 1.5 m for 100 kV, and at least 2.5 m for 200 kV.
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