http// Safety Warning ● The staff using the DC high voltage tester must be professionals with a "high voltage test certificate". ● When using this instrument, users must comply with Article 168 of the "Electric Power Safety Regulations" and install two obvious disconnection points before the working power enters the tester. When replacing the test object or wiring, first disconnect the two power disconnection points clearly. ● Before testing, check whether the grounding wires of the tester control box, voltage doubler cylinder, and test object are properly connected. The test circuit grounding wire should be connected to a single point as shown in this manual. ● For discharging large capacitance test objects, discharge should be carried out using a 100Ω/V discharge resistor rod. When discharging, do not immediately contact the test object with the discharge rod. Gradually approach the test object with the discharge rod until at a certain distance the air gap begins to ionize and discharge with a hissing sound. When no sound is heard, the discharge rod can be used for discharge, and finally directly connect the grounding wire for discharge. ● When performing capacitive load tests, be sure to connect a current limiting resistor. ● When the DC high voltage is 200kV and above, even if test personnel wear insulating shoes and are in an area beyond the safety distance, due to the influence of the high-voltage DC ion space electric field distribution, several nearby standing human bodies may carry different DC potentials. Test personnel should not shake hands with each other or touch grounding bodies with their hands, otherwise there may be a slight electric shock. This phenomenon is more obvious in dry areas and winter, but due to the small energy, it generally does not cause harm to people. ● After the test, the grounding wire must be hung on the high-voltage output terminal before removing the high-voltage lead. - 1 - http// I. Introduction The ZGS-Q series DC high voltage tester is a new generation of portable DC high voltage tester designed and manufactured according to the new Chinese electric power industry standard DL/T848.1-2004 "General Technical Conditions for DC High Voltage Generators". It is mainly suitable for DC withstand voltage tests on high-voltage electrical equipment such as zinc oxide arresters, power cables, transformers, and generators in electric power departments, industrial and mining enterprises, metallurgy, steel and other enterprise power departments. II. Working Principle Block Diagram III. Main Technical Parameters and Features 1. Technical Features: ● The chassis adopts an aluminum alloy case. ● It adopts a medium-frequency voltage doubling circuit, applying PWM pulse width modulation technology and high-power IGBT devices. ● It adopts large voltage feedback, with high output voltage stability and ripple coefficient ≤3%. ● Full-range smooth voltage regulation, with good voltage adjustment fineness, adjustment accuracy ≤0.5%, stability ≤1%, voltage and current error ±(1.5%±2 digits), current error ±(1.5%±2 digits). ● The boost potentiometer starts from zero for boosting. ● 0.75UDC1mA function button, convenient for zinc oxide arrester tests, with accuracy ±(2%±2 digits). ● Overvoltage protection is set by dial code, clear at a glance, with error ±2%. ● The voltage doubler adopts new materials, lightweight and sturdy. The surface is coated with special insulating material, with good electrical performance and strong moisture resistance. ● The ZGS-Q product meets the technical requirements of DL/T848.1-2004 and has passed the type test of the Electrical Equipment Quality Inspection and Testing Center of the Ministry of Electric Power, and is strictly implemented according to the enterprise standard for factory delivery. - 2 - http// 2. Technical Parameters: Specification 60/2 60/3 60/5 120/2 120/3 120/5 Technical Parameters Rated Voltage (kV) 60 60 60 120 120 120 Rated Current (mA) 2 3 5 2 3 5 Rated Power (W) 120 180 300 240 360 600 Chassis Weight (kg) 8 8 8 2 3 5 Voltage Doubler Weight (kg) 4 4 5 6 6