The load capacity of the Primary Current Injection Test Set is suitable for busbar protection and verification of current transformer ratios, etc., and can adjust current relays and switches. It is mainly used for testing items such as busbar protection and various current transformer ratios. Due to low power consumption, large-capacity self-twisting regulator and high-permeability magnetic core, the converter has a large output power. The advantages of small size and light weight.
"Suspicious points" of high current generator test:
Why use a Primary Current Injection Test Set to measure the circuit resistance of the circuit breaker?
GDSL-D Seriese Digital Primary Current Injection Test Set
1. In the preventive test and switching test of the power supply system, many high-current electrical equipment need to accurately measure the resistance of the circuit. Circuit breakers are important electrical equipment in power systems. The national standard GB and the electric power industry standard DL/T stipulate the measurement of the resistance loop resistance of the circuit breaker: it should be measured by the DC voltage drop method, and the current is not less than 100A.
2.?The resistance of the conductive circuit of the circuit breaker mainly depends on the contact resistance between the movable contact and the static contact of the circuit breaker. The presence of contact resistance will increase the loss when the conductor is energized, thereby increasing the temperature at the contact, and the value of this value directly affects the current-carrying capacity during normal operation, thereby affecting the short-circuit cutting ability. The circuit current is in degree. Therefore, the resistance value of each phase of the circuit breaker is an important data for the installation, overhaul and quality acceptance of the circuit breaker.
3. The contact resistance of the circuit breaker was previously measured using a DC double-arm bridge. However, when the double-arm bridge is used to measure the resistance of the conductive circuit of the circuit breaker, since the current through the double-arm bridge measurement circuit is very weak, it is difficult to have an oxide film with a large resistance, and it is difficult to measure the resistance value too large, but the oxide film is easy It ruptures under high current and will not hinder the passage of normal current. Therefore, when using the DC voltage drop method for testing, the current should not be too small.
4. There are many ways to measure contact resistance. Foreign scholars propose to use superconducting quantum devices to measure contact resistance, to measure contact resistance by electrolytic cell method, and to measure contact resistance by third harmonic method. These methods are commonly used for electrical contact research under laboratory conditions. In engineering, the four-terminal method is usually used to measure the contact resistance of actual contacts.
HVHIPOT GDSL-D series digital display high current generator (upflow device) is a necessary equipment for all walks of life in electrical debugging where high current is required. It is used in power plants, substations, electrical appliances manufacturing plants, scientific research, and testing. Units such as chambers belong to the short-term or intermittent work system, which has the characteristics of small size, light weight, good performance, and convenient use and maintenance. Mainly used for primary bus protection and verification of various current transformers, motor protectors, air switches, switch cabinets, circuit breakers, protection screens, etc.
Post time: Sep-27-2021