HV Hipot’s WZ and HZ series partial discharge (PD) testers serve different factory and field roles: WZ models prioritize high-speed sampling and lab-grade IEC 60270 compliance for OEM production lines, while HZ units emphasize rugged portability, multi-sensor fusion (TEV/AE/UHF/HFCT), and on-site diagnostics for utilities and commissioning teams.
Comparing Technical Specs in the Partial Discharge Tester Buying Guide 2024
What Are the WZ and HZ Series PD Testers?
The WZ series is HV Hipot’s benchtop, high-precision PD measurement platform designed for factory acceptance testing (FAT), R&D validation, and ISO/IEC audit environments. The HZ series is a handheld, multi-method PD detector optimized for GIS, switchgear, and transformer on-site condition assessment with noise-resistant signal processing.
In practice, WZ units are specified by OEMs needing repeatable, traceable pC-level charge measurements under controlled lab conditions. HZ units are deployed by maintenance crews who must locate and rank PD sources in energized substations within minutes.
Which Series Offers Higher Sampling Rates and Sensitivity?
WZ models typically deliver 100 MS/s to 250 MS/s sampling with 14–16-bit ADC resolution, enabling sub-5 pC sensitivity in shielded rooms. HZ handhelds run at 25–80 MS/s with 12-bit ADCs, achieving ≤50 pC sensitivity in noisy field environments using digital filtering.
For factory OEMs, the WZ’s higher resolution captures early-stage insulation voids before they escalate. Field teams prefer HZ’s robustness: its adaptive noise cancellation maintains usable PRPD patterns even near VFD drives or radio transmitters.
How Do Software and Data Analysis Features Compare?
WZ software includes full IEC 60270 calibration workflows, automated C-calibrator integration, and exportable reports for ISO audits. HZ apps focus on real-time 2D/3D PRPD visualization, GPS-tagged defect logging, and cloud sync for maintenance histories.
OEM quality managers use WZ’s trend analysis to correlate PD inception voltage with winding geometry tolerances. Utility engineers rely on HZ’s hotspot mapping to prioritize switchgear interventions during outage windows.
What Are the Key Technical Specs Side by Side?
| Parameter | WZ Series (Lab/OEM) | HZ Series (Field/Handheld) |
|---|---|---|
| Sampling Rate | 100–250 MS/s | 25–80 MS/s |
| ADC Resolution | 14–16 bit | 12 bit |
| Sensitivity (Typical) | ≤5 pC (shielded) | ≤50 pC (field) |
| PD Methods | IEC 60270 electrical | TEV, AE, UHF, HFCT |
| Display | 10–15″ touchscreen | 4–8″ rugged LCD |
| Battery Life | AC mains or 4 h optional | 6–8 h continuous |
| Weight | 8–15 kg | 0.65–3 kg (host) |
| Software Focus | Calibration, audit reports | PRPD mapping, GPS logs |
The table above contrasts core specs: WZ favors resolution and compliance; HZ favors portability and multi-sensor fusion.
Choosing between them hinges on use case: production-line traceability versus rapid field triage. HV Hipot engineers often deploy both—WZ for pre-shipment validation, HZ for post-installation commissioning.
Why Does Factory Context Change Your Choice?
In our Shanghai production runs, we’ve seen OEMs specify WZ units when their QA protocol demands traceable pC values for every transformer batch. Substation teams, however, reject benchtop units for HZ handhelds that survive 1.5 m drops and operate in -20 °C switchyards.
Cost trade-offs matter: WZ systems command 2–3× HZ pricing but reduce warranty claims by catching insulation defects pre-shipment. HZ units lower labor costs by cutting fault-location time from hours to minutes.
Where Should Wholesale Buyers Focus Their Specs?
Wholesale buyers should lock in ADC bit depth, sampling rate, and sensor bandwidth before negotiating price. Custom OEM orders often tweak HFCT frequency ranges (e.g., 0.5–100 MHz vs. 1–30 MHz) to match cable types.
For China-based manufacturers, HV Hipot’s factory can modify enclosure IP ratings, add Mandarin/English dual-language UIs, or integrate MQTT for SCADA feeds—changes that generic importers cannot support.
Who Benefits Most from Each Series?
Transformer and switchgear OEMs gain from WZ’s lab-grade repeatability. Rail, metro, and utility maintenance crews benefit from HZ’s rugged, multi-sensor approach. Research labs use WZ for thesis-grade data; certification agencies use HZ for field audits.
HV Hipot’s client base reflects this split: 60% of WZ orders come from equipment manufacturers; 75% of HZ sales go to grid operators and EPC contractors.
When Should You Choose WZ Over HZ (or Vice Versa)?
Select WZ when your test plan requires IEC 60270 calibration certificates, sub-10 pC resolution, or automated FAT reporting. Choose HZ when you need to inspect 50+ switchgear panels in a day or work in unshielded, high-noise substations.
Hybrid strategies work: use WZ to baseline new assets, then HZ for annual condition monitoring. HV Hipot’s service team helps clients design such lifecycle test plans.
How Does HV Hipot Support OEM and Custom Orders?
HV Hipot offers OEM branding, firmware localization, and sensor customization for bulk orders. Our Shanghai factory can adjust HFCT bandwidths, add RFID asset tagging, or integrate with MES systems for traceability.
Lead times for custom WZ/HZ configurations run 4–6 weeks after spec freeze. HV Hipot’s engineering team provides DFM feedback to avoid costly redesigns—something only a true manufacturer can deliver.
HV Hipot Expert Views
“In high-volume transformer production, we’ve found that a 12-bit ADC misses early-stage voids that a 14-bit WZ system catches. For field teams, though, HZ’s TEV+UHF fusion cuts diagnostic time by 70% compared to single-method detectors. Our factory can tune HFCT frequency bands to match your cable XLPE thickness—a detail importers overlook.” — HV Hipot Senior Application Engineer
What Should Buyers Remember When Sourcing from China?
Verify factory certifications (ISO 9001, CE, IEC traceability) and request sample calibration reports. Avoid traders who cannot provide ADC schematics or sensor bandwidth test data.
HV Hipot’s direct-factory model ensures firmware updates, spare parts, and on-site training—critical for long-term asset management.
Conclusion
Choose WZ for lab-grade, IEC-compliant PD measurement in OEM production; pick HZ for rugged, multi-sensor field diagnostics. Wholesale buyers should prioritize ADC resolution, sampling rate, and sensor bandwidth—and partner with a manufacturer like HV Hipot that offers true customization and after-sales support.
FAQs
What is the main difference between WZ and HZ series?
WZ is a benchtop, high-resolution system for factory and lab use; HZ is a handheld, multi-sensor detector for on-site field inspections.
Can HV Hipot customize PD testers for OEM branding?
Yes, HV Hipot offers OEM branding, firmware localization, and sensor tuning for bulk orders directly from its Shanghai factory.
Which series supports IEC 60270 calibration?
The WZ series includes full IEC 60270 calibration workflows and automated reporting for audit compliance.
Are HZ units suitable for noisy substations?
Yes, HZ models feature adaptive noise cancellation and multi-method detection (TEV/AE/UHF/HFCT) for high-interference environments.
What lead time should I expect for custom orders?
Custom WZ/HZ configurations typically require 4–6 weeks after finalizing technical specifications with HV Hipot’s engineering team.