The smallest VLF/DC unit on the market now includes an integrated Tan Delta measurement system to perform advanced electrical insulation diagnostics. For example, this can be extremely useful when performing advanced diagnostics on cable systems as it provides valuable information as to the condition of the cable insulation and shield.
The instrument automatically performs a TD test, stepping up the voltage at the user prescribed levels (according to the IEEE) and stores the results. All test parameters including insulation resistance, capacitance, RMS current and voltage, test durations, voltage steps, tan delta, and standard deviation are all measured and displayed by the HVA28 LCD display or stored to an internal memory.
Test results can also be transferred directly to a USB memory stick or wirelessly via Bluetooth to a PC for later analysis and reporting using the supplied industry leading reporting software - TD Control Center. All units are shipped with a calibration certificate, TD Control Center software, corona protection shields, Bluetooth dongle, and an accessories tote.
Features
Output voltage 28 kVpeak , 20 kVrms
Pure sinusoidal output voltage (load-independent)
Internal TD measurement with high accuracy (1 x 10-4)
Tan Delta measurement with various frequencies (0,01 0,1 Hz)
Leakage Guard® – leakage current correction
Output current 20 mA max.
Highest test capacity of 10 µF
Ultra light and compact weight (14 kg)
Protection class IP67 (with closed lid)
Total protection almost unbreakable, watertight, dustproof and corrosion proof case
Large Colour display (4,3)
USB and Bluetooth connections
Cable testing according: IEC60502-2:2015, IEEE 400.2-2004, CENELEC HD 620/621, IEEE400.2-2013 etc.
Programmable test sequences
Upgradable with partial discharge diagnostic system (optional)
Integrated 12 kV transient protection (50 Hz)
Dual Discharge Device (DDD®), two integrated and automatic discharge devices
Easily exchangeable HV cable
Intuitive menu operation
Sheath Fault Locating (in combination with Earth Fault Locator)1
Vacuum Bottle Test
Insulation Testing
