Transformer bushing failures sometimes occur outside the capacitive layers, where traditional analysis of leakage
currents will not give indication of an internal problem.
When the utmost in transformer reliability is required for critical transformer assets, partial discharge detection must
be part of the monitoring strategy. The TransMAX 2000 performs all the test methods of the ZVCM-1001 but also monitors
for partial discharge (PD). The PD activity in the bushings is monitored in parallel with the power factor calculations.
PD is detected using the same bushing sensor as with the ZVCM-1001, there are no other sensors or Rogowski coils.
PD is caused by defective insulation in high-stress areas, movement of energized parts, or design errors where lowlevel
discharges occur. Some types of PD may not present a problem, but others can develop into surface tracking or
insulation failure, which can lead to bushing or transformer failure. The TransMAX 2000 also has the unique capability of
monitoring GIC events and trends which potentially could damage the transformer.
Easy-to-use MultiTool software works with both the TransMAX 2000 and ZVCM-1000.
Additional Specifications TransMAX 2000
Power Supply Input
85-264 VAC, 120-370 VDC, 50 VA
PD Frequency HF <20 MHz
PD Resolution 1.0°
Time Resolution 10 nS
Dynamic Range 65 dB
PD Intensity 0 – 5000 mW
PD Amplitude 0.02 – 100 nC ± 10 V
Top oil temperature sensor input
Three load current CT sensor inputs
Ambient Temperature and Humidity sensor inputs
USB port for ZTZ software configuration, commissioning and
RS-485 port for SCADA
Modbus RTU or DNP 3.0 Serial
Ethernet port remote access via ZTZ Software,
SCADA access over Modbus TCP or
DNP over Ethernet
PF, C1, leakage current for each bushing
Imbalance for each group of 3 bushings
PD power, PD amplitude, PD pulse count for each channel
PRPD plots for each channel
Top oil temperature
Ambient temperature and humidity