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In accordance with the national standard requirements for temperature rise testing of high-current generators in low-voltage switchgear, the following solution is proposed considering the characteristics of multiple outgoing circuits and varying outgoing currents:
1. Implementation Method: Three sets of nine-phase current output sources (0-700A) are employed to apply current at the outgoing line terminals. Each current source allows adjustable current magnitude while maintaining identical phase alignment (perfectly aligned A-phase, B-phase, and C-phase angles). The total current delivered to the incoming line cabinet equals the sum of all individual current outputs.

Low-voltage switchgear systems typically feature three-outlet configurations (with most phases supporting 630A maximum current and some reaching 800A), four-outlet configurations (mostly 630A), or single-outlet designs (1250A). Our NX-700-2000 temperature rise testing device (JP cabinet) is designed for three circuits with nine-phase output, delivering 800A per phase.

I. Main Unit Parameters and Functions   

1. Main functional features:

1) Built-in high-performance industrial PC with programmable logic controller (PLC) as the central processor, which performs real-time scanning of AC signals to achieve comprehensive monitoring and closed-loop control. A password-based access management system is implemented, allowing only authorized personnel to operate specific functions. External computer control is also supported.

2) The imported PC features true-color large LCD touch screen operation with intelligent sensors supporting fieldbus technology, achieving fully digital data transmission. The display interface utilizes touch-sensitive color LCD screens (or external computers), featuring a comprehensive Chinese menu with clear and intuitive visuals for effortless operation. The system requires no external auxiliary devices during testing, offering fully automated control and user-friendly operation that ensures speed, simplicity, and convenience.

3) This instrument offers two testing methods: fully automatic testing and manual testing, requiring only simple configuration of test current and duration. It is equipped with an automatic current stabilization system.

4) Only the target current needs to be set, eliminating the need for manual monitoring. Simply configure the test parameters, current value, and step size to avoid tedious tasks such as manual voltage adjustment, manual recording, and curve plotting. This reduces labor intensity and improves work efficiency. After operation, data can be directly read and viewed on a computer.

5) Automatic alarm function exceeding specified limits with reliable self-protection against overheating, overcurrent, overvoltage, and short circuits. The AC voltage regulation device protection should employ dual safeguards: microcomputer-based automatic protection control and mechanical micro-motion limit switches to ensure normal operation under constant current conditions, thereby enhancing product safety and reliability.

6) User-friendly interface with fully Chinese-language operation. The control software features data recording capabilities, including storage of current and temperature waveforms, along with practical functions such as data management, report generation, and printing. All parameter settings are completed within the software, enabling intuitive analysis of current-temperature relationships and clear visualization of test results. During experiments, the system automatically tracks target current values, maintains stable output current, and adjusts three-phase currents. Upon completion, it automatically resets to zero position.

7) The automatically adjustable AC constant current source shall comply with temperature rise tests for medium and low voltage switchgear assemblies (including multi-output control cabinets such as GCK and MNS) specified in GB 7251.1 to GB 7251.5 standards. It must support parallel operation of multiple constant current power sources during temperature rise tests (customer-submitted documentation proving parallel operation of multiple constant current sources, e.g., temperature rise test results for GCK or MNS systems, is required). 8) Equipped with a three-phase automatic balancing system to ensure balanced output across all phases. Current sampling utilizes 0.2-class current transformers integrated with cutting-edge power electronics technology, featuring strong anti-interference capabilities and high output precision that can reach Class 0.5 accuracy.

9) Equipped with a precision adjustment menu, users can manually adjust error values. The programmable AC constant current power supply enables fully intelligent calibration, automatically generating multi-stage correction coefficients within the adjustable range of the device to ensure stable current output precision.

10) Customizable test modules based on user requirements with lifetime free software upgrades.

11) Three-phase power compensation capability.

12) Laboratory management functions compliant with ISO17025 requirements for personnel, machinery, materials, resources, and environment. Key features include: mandatory username/password authentication for equipment access, and administrator-authorized personnel enrollment. (Computer software functionalities) 

 II.Whole Machine Parameters