This article is mainly about the related introduction of the circuit breaker tester, and focuses on the detailed description of the function and characteristics of the circuit breaker tester.
Circuit breaker testerThe circuit breaker characteristic tester takes the single-chip microcomputer as the core for sampling, processing and output. Its main feature is to use Chinese characters to prompt and operate in a man-machine dialogue mode. The Chinese characters display the results and print out. It is intelligent, multi-functions, accurate data, and anti-interference. It has the advantages of strong performance, simple operation, small size, light weight, beautiful appearance, etc. It is suitable for the dynamic characteristic test of various indoor and outdoor oil-less, oil-rich switches, vacuum switches, and sulfur hexafluoride switches.
characteristic
1. The inherent opening and closing time of 12 fractures; 2. Reclosing time; 3. The biggest difference between opening and closing; 4. Just splitting and just closing speed; 5. Bounce time and amplitude; 6. Switch opening distance and switch over-travel (vacuum switch preset switch travel); 7. Average speed of opening and closing; 8. Display and printing speed-distance curve
Test parameters
1. Time measurement can measure the number of fractures at the same time: ≤12 measurement process setting time: 0-6 seconds resolution: 0.1ms2. Switch opening distance, switch over-travel, bounce amplitude measurement range: "1000mm resolution: 1mm3. Measurement error time measurement error: ±1% travel measurement error: ±1%. 4. Speed ​​measurement range: 0～20m/s 5. Built-in power supply output voltage: 20V～230V Error: 1% 6. Working conditions Working voltage: AC220V±10% Frequency: 50Hz Power consumption: ≤60w Working environment temperature: 0～40°C Working environment humidity: ≤90%RH Volume: 400×350×200 mm3 Weight: 7kg
What are the functions and characteristics of the circuit breaker testermain feature
1) The main control part adopts high-performance industrial computer, Windows XP operating system, real-time display of various parameter curves and values.
2) Keyboard and touchpad input (USB mouse can be connected); 5.7 inch TFT true color LCD screen display. The operation is simple, the interface is beautiful, and all the parameters are clear at a glance.
3) Switch constant current control technology, new power devices, 1A～500A self-set constant current output, high constant current accuracy, strong load capacity, and stable work for a long time.
4) It is suitable for the ampere-second characteristic test of DC circuit breakers with a rated current of 1A～500A, and can be used for the ampere-second characteristic test of 6A～100A DC fuse.
5) The measurement method adopts full-point test or sampling point test, with fast response speed, high test accuracy, and safety and reliability.
6) The instrument has overheating, overcurrent, overvoltage protection functions, good electromagnetic compatibility, and strong anti-interference ability.
7) The test management software can automatically complete the test of the ampere-second characteristic of the DC circuit breaker, and analyze the test data to draw the circuit breaker protection characteristic curve (the ampere-second curve), and generate report output.
8) The industrial computer comes with 4G storage space, which can store test records at will, and is equipped with two USB ports to facilitate the extraction and printing of test records.
9) The instrument adopts an integrated design, which is easy to carry.
The main function
According to the GB10963-1999 standard for overcurrent protection circuit breakers used in households and similar places, circuit breakers should be tested for their tripping characteristics.
1) Time-current characteristic test
â‘ Starting from the cold state, apply a current of 1.13In (the agreed non-trip current) to the circuit breaker until the agreed time, and the circuit breaker should not trip. Then within 5s, the current is steadily increased to a current of 1.45In (agreement tripping current), and the circuit breaker should trip within the agreed time.
â‘¡Starting from the cold state, apply a current of 2.55In to each level of the circuit breaker, the disconnection time should be greater than 1s, and the disconnection time of the circuit breaker with the rated current less than or equal to 63A should be less than 60s, for the circuit breaker with the rated current greater than 63A The disconnection time of the device should be less than 120s.
2) Instantaneous trip test
â‘ For type B circuit breaker: starting from the cold state, pass a current of 3In to each level of the circuit breaker, and the disconnection time should be greater than 0.1s; then start from the cold state, pass a current of 5In to each level of the circuit breaker , The disconnection time should be less than 0.1s.
â‘¡For type C circuit breaker: starting from the cold state, apply a current of 5In to each stage of the circuit breaker, and the disconnection time should be greater than 0.1s; then from the cold state, apply a current of 10In to each stage of the circuit breaker , The disconnection time should be less than 0.1s.
â‘¢For D-type circuit breaker: starting from the cold state, apply a current of 10In to each stage of the circuit breaker, and the disconnection time should be greater than 0.1s; then from the cold state, apply a current of 50In to each stage of the circuit breaker , The disconnection time should be less than 0.1s. Both of these tests should satisfy the time-current action characteristic table.
Circuit breaker tester wiring
1. Safety preparations: First of all, ensure that the tested switch is in the pre-test state for power failure, maintenance, grounding at both ends of the switch, the switch is in the closed position, and the operating power of the high-voltage circuit breaker is cut off to avoid "collision" with the internal DC of the instrument. The simple way is to remove the control insurance.
2. Field wiring:
(1) The metal grounding pole of the instrument must be reliably connected to the earth;
(2) Short-circuit the movable contact of the three-phase circuit breaker with the test wire, and then reliably connect it with the metal grounding pole of the instrument, and then connect the breaker wire of the switch. It is best to wear insulating gloves for the wiring of high-voltage circuit breakers such as 220 KV and 500 KV with strong induction.
(3) Install the speed sensor.
(4) Understand other conditions: â‘ The operating power of the switch is whether the switching power supply is DC or AC. If it is DC, you can use the internal power supply of the instrument. If it is not DC, you must use a power source other than the instrument to trigger the test with an external synchronization signal (external trigger). â‘¡ Whether the operating power supply is DC220V or DC110V, it must be set and adjusted before the test. â‘¢ Connection method of closing and opening control lines. For hydraulic or spring mechanisms, the closing coil current is less than 30A, the instrument's internal DC power supply can be directly driven, and the closing control can be directly connected to the closing coil, but it is best to string in the auxiliary node of the coil. For an electromagnetic mechanism with a coil current greater than 30A, the internal DC power supply of the instrument cannot be directly driven, and the closing control of the instrument must be connected to the front contactor coil of the closing coil for testing. â‘£ When the on-site switch is locked, the power supply operation switch in the instrument may not be able to operate when testing. At this time, the lock must be released before the test can be performed. Or use external trigger mode to test.
(5) Turn on the knives at both ends of the switch, the next step can be tested.
3. Remove the wire after the test: Operate the instrument to test the mechanical characteristics of the switch. After the test, turn off the power of the instrument, and close the ground knife at both ends of the switch. Remove the instrument opening and closing control line, break line, speed sensor and its signal line, and then remove the short wiring of the switch movable contact, and finally remove the ground wire. Then resume the site and end the entire test work
ConclusionThat's it for the relevant introduction of the circuit breaker tester. I hope this article can be helpful to you.
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