NX-30A DC test power supply
The NX-30A DC test power supply is a fundamental preventive test designed to ensure the safe operation of high-voltage circuit breakers in power systems.
I.Overview
The NX-30A DC test power supply serves as a fundamental preventive test to ensure the safe operation of high-voltage circuit breakers in power systems. Currently, power departments primarily employ the following two testing methods:
1. The DC system of the on-site control cabinet is used as the test power source, with voltage adjustment performed through a variable resistor. The primary drawback of this method is that if short circuits or direct DC grounding occur during on-site testing wiring, it will directly affect the entire on-site DC system. In mild cases, this may result in loss of protection for high-voltage equipment, while in severe cases, it could lead to complete collapse of the on-site DC system.
2. Utilizing on-site alternating current, simple silicon rectification is performed using a voltage regulator to directly output direct current (DC). The disadvantages of this method are: ① The voltage regulator is bulky and inconvenient to use, with significant output DC ripple; ② There is no isolation between input and output, and the housing may carry electric charge, posing a risk to personal safety.
In light of the aforementioned circumstances, our company has developed a next-generation high-voltage switchgear power supply system. This innovative solution features complete input/output isolation, delivers stable and reliable DC output with minimal ripple coefficients, incorporates overcurrent and overvoltage protection, boasts an aesthetically designed compact structure, and offers simplified wiring and operation. It provides independent test power for on-site high-voltage switchgear operation trials, eliminating the need to directly utilize the DC systems within field control boxes. This design effectively prevents potential hazards to on-site DC systems while ensuring safe operation of critical equipment.
II. Main Technical Parameters
Operating temperature: -10 to 50°C
Ambient humidity: ≤75% RH
Input power supply: AC220V±10%
DC output: 5–270V (continuously adjustable) Current rating: 10A Instantaneous working current: 30A
Ripple factor: <3%
Voltage stability: <3%