DC Circuit Breaker Ampere-Second Characteristic Tester

DC Circuit Breaker Ampere-Second Characteristic Tester

DC power distribution networks in substations generally adopt a tree-shaped three-level distribution structure, with DC circuit breakers widely used as protective components. Mismatched operating characteristics between upper and lower-level breakers often cause unwanted tripping faults, leading to power outages and potential damage to primary power equipment. Relevant industrial codes and regulations mandate regular ampere-second characteristic tests for newly installed and in-service DC protective devices to guarantee proper stage coordination of DC circuits.Traditional testing equipment for ampere-second characteristics is bulky, complicated to operate and limited to professional laboratories. Some field test methods using substation battery banks cannot achieve accurate current-time characteristic measurement. The MEAS-500A tester is developed for on-site field application, featuring portability and high automation. It is designed to verify operating characteristics and stage matching of DC protective devices, effectively improving the operational reliability of DC power systems and power grids.This instrument is applicable for testing ampere-second characteristics of DC circuit breakers with rated current ranging from 1A to 500A, as well as DC fuses with rated current from 6A to 150A.

1. Dual Operation Modes: Supports standalone operation and PC online connection to meet different test scenarios.

2. Human-Machine Interaction System: Equipped with a 320×240 LCD display and high-speed thermal printer; full keyboard control realizes intelligent automatic operation throughout the test process.

3. High-Performance Current Output: Adopts power electronic control technology to deliver continuous adjustable large current with fast response and high precision.

4. High-Precision Acquisition Module: Built with multiple high-accuracy sensors for automatic range switching and a 14-bit high-resolution AD acquisition chip to ensure stable data collection.

5. Data Storage Function: Supports power-off data retention, capable of storing up to 200 groups of test records. The system automatically saves parameter settings and restores the last configuration after power restart.

6. Dedicated Test Modes: Provides two optional test types: ampere-second action test and continuous current non-action test for targeted performance verification.

7. PC Online Functions: Realizes remote instrument control, data import, storage, curve generation, report creation and Excel format data export when connected to a PC.

8. Multi-Level Protection Design: Integrated overheating, over-current and over-voltage protection functions to ensure equipment and operation safety.

9. Strong Environmental Adaptability: Excellent electromagnetic compatibility and anti-interference performance for stable operation in complex on-site electromagnetic environments.

• Routine inspection and characteristic testing of DC circuit breakers and DC fuses in substations· Verification of stage coordination performance of multi-level DC distribution protection devices· Acceptance test for newly installed DC protective electrical appliances· Periodic performance spot check for in-service DC protection components in power systems

Panel Structure

The front panel integrates power interface, power switch, LCD screen, LCD contrast adjustment knob, full-function keyboard, thermal printer, RS232 communication port, current output terminals and grounding terminal. All functional areas are reasonably arranged for convenient wiring and operation.

1. Standalone Operation

• Complete wiring according to the wiring diagram before power-on. Select the required test mode on the welcome interface via direction keys and confirm to enter the main operation interface.· Set rated current, current multiple and maximum test duration in the parameter setting area. The actual output current is calculated as Rated Current × Current Multiple. Restrictions: Output current ≤ 500A; Test duration ≤ 9999s for current below 200A; Test duration ≤ 300s for current above 200A.· Start the test after parameter configuration. The system automatically times and captures the tripping signal of the tested device, then records and stores test data after test completion.· Operate the clear and print functions to delete selected records or print test reports; access the function management interface to adjust system clock or clear all historical data.

2. PC Online Operation

• Connect the instrument and PC via RS232 cable, then run the supporting upper computer software.· The software supports file opening, data saving, Excel export and print preview. Enter the test interface to remotely control the tester, upload real-time test data, display data curves and generate standardized test reports.· Multiple repeated tests can be performed under the same current multiple, and the software automatically calculates average values for comprehensive data analysis.

The product complies with the Operation Specification for DC Power System, Technical Supervision Regulation for DC Power System and Measures for Preventing Accidents of DC Power System issued by State Grid Corporation of China, meeting the on-site test requirements for DC protective electrical appliances.

Transportation Requirements

• Use the original wooden packaging box and shockproof accessories for transportation to avoid mechanical damage.· When packaged with the original box, the maximum stacking layer is 2 layers; stacking is prohibited without wooden packaging.· Keep the instrument panel facing upward during the whole transportation process.

Storage Requirements

• Store the equipment in dry, dust-free, ventilated rooms without corrosive gas.· Lay moisture-proof materials at the bottom of the equipment during long-term storage; stacking is not allowed.· Keep the panel upward when placing the instrument.

1. Rotate the current adjustment knob counterclockwise to the zero position before turning on the power switch.

2. Place the instrument in dry and ventilated environments free of corrosive gas.

3. Do not disassemble, modify or repair the equipment without authorization to prevent electric shock hazards.

4. Keep the wiring terminals tightly connected during testing and remove dirt and oxide on the tested device terminals to ensure good contact.

5. Do not block the ventilation duct of the instrument during operation. The overheating protection function will automatically stop the equipment in case of overheating; restart the tester after proper cooling for normal use.