DC Withstand Voltage Tester | Detailed introduction of technical principles

The core principle of a DC withstand voltage tester is to apply high-voltage DC to the insulation of electrical equipment and evaluate its insulation performance by measuring the leakage current at the microampere level.

Unlike AC testing, there is no capacitive current under DC voltage, requiring less equipment capacity, making it particularly suitable for on-site testing of capacitive loads such as cables and capacitors. During testing, the voltage is gradually increased to a preset value and maintained. At this point, the current flowing through the insulation is only the leakage current, which consists of conduction current (generated by the internal conductivity of the insulation) and absorption current (generated by dielectric polarization, which decays).

By monitoring the magnitude of the leakage current and its trend over time, it is possible to effectively determine whether the insulation resistance is up to standard and to detect problems such as insulation dampness, aging, or concentrated defects (manifested as a sudden increase in current). Although DC testing cannot completely simulate operating conditions as AC testing, it has advantages such as lightweight equipment, less damage to insulation, and easier detection of localized defects. DC withstand voltage tester, DC withstand voltage test, DC voltage testing system 200kV 300kV 2mA 3mA 5mA. This DC withstand voltage testing device is suitable for power, railway, chemical, mining, metallurgy, and steel industries for DC withstand voltage and leakage tests on equipment such as zinc oxide surge arresters, magnetic blow-out surge arresters, power cables, transformers, and generators. It can also be used as a power source for electrostatic dust collection and spraying.

1. The instrument is suitable for power, railway, chemical, mining, metallurgy, and steel industries for DC withstand voltage and leakage tests on equipment such as zinc oxide surge arresters, magnetic blow-out surge arresters, power cables, transformers, and generators. It can also be used as a power source for electrostatic dust collection and spraying.

2. Stable output voltage: Utilizing a high-frequency voltage multiplier circuit and the latest PWM pulse width modulation technology and voltage-current dual closed-loop feedback technology, it improves power supply regulation and load regulation, resulting in high voltage stability and low ripple.

3. Smooth voltage regulation across the entire range; high output voltage accuracy. The main unit voltmeter directly displays the voltage value applied to the load, eliminating the need for an external voltage divider and simplifying wiring. Voltage resolution is 0.1kV, and current resolution is 1uA.

4. Comprehensive Protection: It features complete protection functions, including zero-position protection, overvoltage protection, overcurrent protection, and breakdown protection. The protection circuit uses nanosecond-level dedicated sensors, ensuring rapid and reliable operation and effectively protecting personnel and equipment safety.

5. 0.75U Function: An intelligent, high-precision 0.75U function one-button button is added. Pressing this button automatically switches the voltage and current to the 0.75U state, facilitating the testing of zinc oxide surge arresters.

1. Split-type specifications: 200/2, 200/3, 200/5, 300/2, 300/3, 300/5

2. Rated voltage (kV): 200/300

3. Rated current (mA): 2/3/5/

4. Rated power (W): 400/600/1000/600/900/1500

5. Voltage accuracy: ± (1.0% reading + 2 digits)

6. Current accuracy: ± (1.0% reading + 2 digits)

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