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The NX-303XL is a next-generation high-efficiency programmable high-current standard source, developed by our company through gathering *** talents, prioritized investment, and innovative design.

This high-current source is specifically designed for substation primary column insertion tests, fault simulation in power system primary measurements, integration of primary-secondary detection equipment applications, and comprehensive test platform construction. It can also be utilized for thermal relay calibration, motor protector testing, contactor inspection, circuit breaker verification, air switch calibration, switchgear inspection, protection panel verification, as well as calibration of high-current clamp meters, shunt devices, current transformers, and high-current AC standard meters. Additionally, it serves as a reliable aging test solution for high-current cables and other high-current equipment. With a maximum output current of 1000A per unit, this system will effectively replace traditional high-current generators and voltage generators, making it an ideal choice for scientific research, production processes, and electrical testing applications in power plants, railway systems, petrochemical facilities, metallurgical plants, and mining operations.

The NX-303XL standard current source adopts a modular design philosophy, featuring a STM32 microprocessor as the main control unit. By integrating advanced technologies such as resonant soft-switching and digital power amplifier technology, it significantly reduces internal component power consumption, enhances overall output efficiency, and minimizes device size and weight. Each module operates with independent current output capabilities, allowing flexible parallel connections, while providing comprehensive overload and open-circuit protection functions. Multiple units can be combined in parallel to deliver output currents ranging from 2000A to tens of thousands of amperes.

The product features a 10-inch touch LCD display with full Chinese-language interface, offering clear and intuitive operation with excellent visual performance. It boasts compact size, lightweight design, wide measurement range, stable output, and convenient software upgrade maintenance. Additionally, the device is equipped with comprehensive protection functions, including automatic protection during open-circuit current conditions and fault location indication.

This device is characterized by advanced technology, reliable performance, comprehensive functionality, and user-friendly operation. All functional parameters comply with relevant regulatory requirements, representing another innovative contribution from Qingdao Naxin Xiangyuan Electrical Equipment Co., Ltd. to its end-users.

The three-phase standard source module can generate three-phase power frequency voltage and current signals with adjustable amplitude, adjustable phase, adjustable frequency, and stable power.

The new three-phase AC current standard source can measure the ratio difference and angular difference of voltage sensors, current sensors, zero-sequence voltage sensors, and zero-sequence current sensors in 10KV high-voltage switches that comply with primary-secondary integration specifications. It also enables error calibration for various primary-secondary integration switch controllers, DTUs, FTUs, distribution terminals, line fault indicators, and power extraction devices.In addition, this device is capable of testing and calibration for various power measurement instruments including electricity meters, voltmeters, ammeters, phase meters, and frequency meters. It also performs calibration for electrical sensors such as instrument voltage transformers, current transformers, and clamp-on current transformers, as well as power transmitters including voltage transmitters, current transmitters, and frequency transmitters. Furthermore, it supports testing and calibration of power data acquisition systems, on-site electricity meter calibration devices, power parameter testers, voltage monitors, distribution load monitors, multifunctional power meters, load management terminals, voltage/current loss timers, and distribution automation terminals.

This device is engineered with high-precision sampling technology and integrated cutting-edge digital signal processing methods. Featuring advanced technology, superior performance, compact size, lightweight design, and portability, it is suitable for both laboratory settings and field applications. We are confident you will find this high-quality product highly satisfactory in use.

 Main Functions and Features

Voltage, current, phase, angle, and frequency are all high-precision, high-stability standard signal outputs with software closed-loop control and high-accuracy output.

For on-site convenience, three single-phase units can be combined for three-phase output testing, or operated independently as standalone single-phase power sources.

1、Adjustment of voltage, current, and phase can be performed simultaneously on three phases or any single phase.

2、The phase angles between three-phase voltages, as well as between each phase voltage and current, can be adjusted within a full 360-degree range.

3、The system supports four output configurations: three-phase four-wire or three-phase three-wire, with either forward or reverse phase sequence, allowing flexible combinations.

4、The touchscreen provides clear visual presentation. Common test points for voltage and current are available, enabling one-click operation for convenient and efficient handling.

5、The unique 'click-to-type' feature significantly simplifies the operation process.

6、It can simultaneously measure and display the ratio difference and angle difference of three-phase current transformers and zero-sequence current transformers.

7、The secondary voltage and current of the current transformer, along with the primary voltage and current, can be displayed in a selectable format.

8、It can be paired with host computer communication software for full-system operation via the host computer, with open communication protocols.

9、When voltage short circuit, current open circuit, or wiring error occurs, the system can automatically stop output with accompanying audio-visual alarms.

10、By adopting advanced power amplifier technology, reliability and stability are significantly enhanced.

11、The synchronization signal function is enhanced, enabling parallel use of multiple devices to achieve currents up to tens of thousands of amperes.

12、The transient function has been added to simulate distribution network experiments such as indication, with a transient time of less than 20ms (extended functionality).

13、Harmonic output function (extended feature).

Technical Performanc

1、AC output current

    A B C三相

range： 30A、  20A 、10A、5A、1A、0.2A；        Adjustment range: (0–100)%RG; Adjustment precision: 0.01%RG; Accuracy: 0.1%RG 

 Stability: ≤0.02%/3min; Output power: 30VA per phase; Full-load adjustment rate: 0.05%RG; Distortion: ≤0.2% (non-capacitive load)

2、 phase：     0°～359.99° ；   Resolution: 0.01; Accuracy: 0.05;

3、 Frequency：   10Hz～1000Hz；   Resolution: 0.001 Hz; Accuracy: 0.005 Hz;

4、Harmonic output：      Harmonic order: 2-50 times | Harmonic content range: 0-40% | Harmonic content accuracy: ±0.1%

5、485 or 232 communication interface