Zinc Oxide Arrester

The HM6020A Resistive Current Tester for Surge Arresters is a specialised instrument designed to assess the electrical performance of zinc oxide surge arresters. This device is suitable for testing zinc oxide surge arresters at various voltage levels, whether energised or de-energised, thereby enabling the timely detection of hazardous defects such as internal insulation moisture ingress and valve disc ageing.

1. Colour touchscreen: 7-inch high-definition colour touchscreen with 800×480 resolution, enabling human-machine interaction.

2. Extended wireless range: Compatible with wireless synchronisation, transmitting signals over 1500 metres wirelessly; optional configuration extends range to 5000 metres.

3. Multiple synchronisation methods: Supports 485 wired synchronisation, wireless synchronisation; voltage-free method utilises software calculation to determine voltage reference – three synchronisation approaches.

4. Live/dead-line compatibility: Suitable for use on live surge arresters, during power outages, or in laboratory settings.

5. Wide measurement range: Voltage acquisition range 0-250V, current acquisition 0-20mA.

1. Power supply: Internal lithium battery or DC 8.4V adapter

2. Measurement range:

Leakage current: 0–20mA (expandable);

(Optional: Current clamp sensor 0–20mA.)

Voltage: 30–250V (expandable);

(Optional: Electric field strength input range: 30kV/m to 300kV/m.)

Angle: 0-360º

Resistive current: 0-20mA (expandable);

Capacitive current: 0-20mA (expandable);

3. Measurement Accuracy:

Current: When total current >100μA: ±5% of reading ±1 digit;

Voltage: When reference voltage signal >30V: ±5% of reading ±1 digit.

4. Measurement Parameters:

Leakage current: Full current waveform, fundamental rms, peak.

Resistive component of leakage current: Waveform

1st, 3rd, 5th, 7th, 9th harmonic rms.

Positive peak Ir+, negative peak Ir-.

Fundamental capacitive current.

Voltage: Voltage waveform, voltage rms.

Phase angle difference, power consumption.

5. Voltage reference signal sampling method:

Wired synchronisation: 40 metres (extendable)

Wireless synchronisation: >1500 metres (extendable)

6. Lithium battery parameters:

Charging time > 2.5 hours

Continuous operating time > 7 hours

Intermittent operating time > 7×24 hours

7. Overall dimensions: Main unit 42cm × 34cm × 18cm

8. Overall weight: Main unit 7.5kg