Timing measurements are the most typical circuit breaker testing. These timing tests are performed to assess operating time, pole disparity, and pre-insertion resistor timing. Timing is measured using a circuit breaker timer. Methods that allow testing to be done with grounding on both sides are recommended because they enhance the safety of the individuals conducting the tests.
Benefits of Testing With a Circuit Breaker Timer
Circuit breakers are checked throughout the production, commissioning, and maintenance processes. The simplest basic test is a timing measurement with a circuit breaker timer. Their principal duty is to measure the timing and motion of medium and high voltage circuit breakers. The devices are appropriate for the following applications. This includes electric power generation, distribution, and transmission, as well as contractor testing in industrial situations.
Personal safety.
When both sides of the breaker are safely grounded, the test personnel’s safety is improved.
Reduced interferences.
The CB MC2 connection modules reduce interferences because they are located close to the breaking elements and have short cables, which reduces cable length for interferences from other active substation components.
Minimized handling effort.
The proposed technique minimizes total test equipment weight by reducing the requirement for lengthy, heavy, high-current cables and their difficult handling.
What are the Technical Requirements of Circuit Breaker Timers?
The Circuit Breaker Time Interval Meter measures and displays Open, Close, and Close-Open timings for all HV circuit breakers under real switchyard settings.
1. The instrument should be able to measure Open, Close, and Close-Open timings of three poles/phases with end-to-end connections.
2. The instrument should be able to measure the timings of various circuit breakers, including SF6, Air Blast, Minimum Oil, Bulk Oil, and Vacuum breakers.
3. The instrument shall provide 30 V DC trigger commands for breaker closing, opening, and close-open operations.
4.The operation timings should be shown in milliseconds on a four-line backlit LCD.
5. The instrument’s range should be 0.1-1000 milliseconds, with a resolution of 0.1 milliseconds.
6. The Test Kit shall monitor pole discrepancy timing, or the time delay between poles during shutting and opening operations.
7.The circuit breaker timer should have an accuracy of 0.05% + one digit.
8.The device requires a power source of 240 V AC ± 20%, 50 Hz ± 5%. The device should be powered by both the mains and a rechargeable battery, with a continuous operating time of 5-6 hours.
9.The instrument should contain a built-in clock to record test findings, including date and time.
10. The equipment should have enough memory to save 100 test results.
11. The instrument should have an intuitive menu-driven user interface. The menu selections should be selected using the keypad.
12. The manufacturer shall provide a full set of test leads with appropriate lengths, insulation grade, terminators, and connections.Shrouded banana plug connections offer greater safety and are preferred.
13. The time interval meter’s test leads must be at least 15 meters long to test HV circuit breakers, including a PVC bobbin for winding.
Conclusion
Circuit breaker timer testers allow you to evaluate the functioning of both new and old circuit breakers. For new installations, it guarantees that the circuit breakers fulfill the criteria and work properly from the start.
S.B.ELECTROTECH
S.B. Electrotech is a company that specializes in manufacturing of electrical and electronic testing and measuring instruments. With years of expertise in this field, we ensure to provide high quality, safe, and sustainable products.
