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QLD-D type discharge counter tester

QLD-D type discharge counter tester

This instrument is suitable for checking and verifying the operation of discharge counters in valve-type surge arresters and zinc oxide surge arresters. It conforms to the requirements of the People’s Republic of China Electric Power Industry Standard “Guidelines for On-site Insulation Testing of Surge Arresters”. It is suitable for testing in power plants, substations, repair workshops, and laboratories. A single wiring connection is sufficient to complete the lightning strike count check and milliammeter indication verification; the instrument is powered by a built-in battery that can operate continuously for over 8 hours.

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Technical Specifications

1. Counting and Verification Function

  • Output Inrush Current Waveform: 8/20 μS (Inrush current from occurrence to peak time is 8 μS, from occurrence to 50% peak time is 20 μS), Peak Current: >500A.
  • Output Voltage Range: 600V/800V/1200V
  • Discharge count and discharge interval can be set. (Default: 5 discharges; discharge interval time is 5 seconds)
  • After discharge, the instrument automatically discharges, ensuring safety and reliability and preventing personal injury.

2. Current Verification Function

  • Current Output Range: 0.0—5mA
  • Output Accuracy: ±2%
  • Current Output Mode:
    • Single Output: If set to 5 mA, the instrument will automatically output 5 mA. The current holding time is 7 seconds. Multiple outputs: Automatically outputs current at 10%, 25%, 50%, 75%, and 100%;
    • For example, if the counter current is 2 mA, it will output 0.2 mA, 0.4 mA, 1.0 mA, 1.4 mA, and 2.0 mA, facilitating on-site comparison and verification of the milliammeter accuracy. The current holding time is 7 seconds.
  • After the current verification, the instrument automatically discharges, ensuring safety and preventing personal injury.

3. Instrument power supply: Built-in rechargeable battery (continuous use for over 8 hours). Charger power supply: 180V～270VAC, 50Hz/60Hz±1%

4. Data storage: Can store 256 sets of data

5. Computer interface: RS232.

6. Calendar clock: Built-in standard calendar clock, allowing manual setting of the clock and date.

Instrument Panel Diagram Description

Instrument Panel Diagram Description
Instrument Panel Diagram Description

1. Lightning Discharge Output Socket U+: Connect to the counter’s input terminal.

2. Lightning Discharge Output Socket U-: Connect to the counter’s casing or ground.

3. Current Calibration Output Socket I-: Connect to the counter’s casing or ground.

4. Current Calibration Output Socket I+: Connect to the counter’s input terminal.

5. Charging Socket: Must be plugged into the provided charger.

6. RS232 Interface: Enables communication with a computer. Facilitates computer control and data transmission.

7. Keyboard: Used for setting parameters, starting the instrument, etc.

8. Display: Used to indicate discharge status, current calibration, etc.

9. Instrument Power Switch

10. Instrument Grounding Terminal

Test Precautions

1. The instrument outputs high voltage during testing; please exercise extreme caution. Human contact with the test leads and counter is strictly prohibited.

2. All test leads can be grounded. Please ensure the instrument is grounded at the test site.

3. The instrument has an automatic discharge function; however, for the safety of personnel, after the test, fully discharge both ends of the counter before disconnecting the test leads. Only then should the grounding wire be disconnected.