Power factor trend
Track relative insulation-loss changes for each monitored bushing.
Solutions / ZTZ Services / Bushing monitoring
See bushing insulation change while the transformer is energized.
ZTZ systems continuously evaluate leakage current, power factor, capacitance and three-phase imbalance. TransMAX-2000 adds partial-discharge analysis for critical transformer assets.
Monitoring principle
Multiple comparisons—not one isolated threshold.
Measurements are taken simultaneously across channels, preserving phase relationships and supporting interpretation against load, temperature, humidity and historical trends.
Capacitance change
Monitor relative capacitance against the commissioned baseline.
Imbalance analysis
Use phase comparison, adjacent-phase reference and sum-of-three-current methods.
Partial discharge
TransMAX-2000 adds high-frequency PD attributes using the same bushing sensors.
System choice
ZVCM for continuous bushing condition; TransMAX for PF, C1 and PD together.
Both systems use bushing test-tap adapters and hard-wired sensors. Final sensor selection depends on the bushing manufacturer, tap type, mechanical interface and site environment.
Online bushing monitor
- Up to six leakage-current channels in the standard brochure configuration
- Power factor, capacitance and imbalance outputs
- Simultaneous multi-channel measurement
- Modbus / DNP3 via RS-485
- Grounded or ungrounded capacitor-tap sensor options
Bushing monitor with PD
- 3- or 6-channel configuration
- PF, capacitance, leakage current and imbalance
- HF/UHF partial-discharge monitoring per supplied manual
- Optional load current, temperature and ambient inputs
- RS-485, Ethernet and USB; Modbus / DNP3 options
Interpretation rule: An alarm is not by itself a final bushing-failure diagnosis. Review simultaneous channels, operating conditions and trend history; confirm with offline testing or specialist analysis when required.
Project definition
What TM Networks checks before configuration.
Mechanical fit and safe tap-interface design are as important as the analytics.
01Transformer, reactor, CT, CCVT or GIS transition-bushing application
02Bushing manufacturer, model, C1 tap type and drawings
03HV/LV phase groups and required channel count
04PD monitoring requirement and criticality of the asset
05Auxiliary supply, alarm contacts, communications and remote access
06Enclosure location, cable routing, environment and commissioning plan
Technical downloads
ZTZ bushing-monitor document center.
Read the concise Korean technical brief first, then use the English manual for installation planning and approved project documentation.
TransMAX-2000 Korean Summary
TM Networks’ unofficial Korean technical summary based on Rev. 03-2023.
한국어 요약 PDFTransMAX-2000 Installation Manual
English user manual, Rev. 03-2023.
English manual PDFTransMAX-2000 Product Brief
Product positioning, FM approval reference and concise specifications.
Product brief PDFZTZ Bushing Monitor Brochure
ZVCM-1001 and TransMAX-2000 portfolio overview.
Brochure PDFZVCM Installation Manual
ZVCM bushing-monitor installation manual, Revision 2.2.
Manual PDFSafety and document control: The Korean file is an explanatory summary, not an installation work instruction. Qualified personnel must follow current approved drawings, the English manufacturer manual and site procedures.
Korea support
Start with the bushing schedule and tap drawings.
TM Networks will review channel count, adapter fit, cable routing, I/O and commissioning scope with ZTZ.