KDJB-903D meets the requirements of on-site testing. This instrument has standard four phase voltage and three-phase current output, which can be used to test various traditional relays and protection devices

1. Meet the requirements of on-site testing. This instrument has standard four phase voltage and three-phase current output, which can be used to test various traditional relays and protection devices, as well as various modern microcomputer protections, especially for transformer differential power protection and backup automatic switching devices, making testing more convenient.
2. Meet the standards of GB/T 7261-2016 "Basic Test Methods for Relay Protection and Safety Automatic Devices" and DL/T 624-2010 "Technical Conditions for Microcomputer based Test Devices for Relay Protection".
3. The Windows XP operating interface is user-friendly and easy to operate; The embedded industrial control computer and 10.4-inch resolution 800 × 600 LED true color display screen can provide rich and intuitive information, including the current working status of the equipment and various help information.
4. The Windows XP system comes with a built-in recovery function to prevent system crashes caused by illegal shutdowns or misoperations.
5. Equipped with ultra-thin multifunctional quick connect buttons and an optical mouse, various operations can be completed through the keyboard or mouse just like operating a regular PC.
6. The main control board adopts a DSP+FPGA structure and a 16 bit DAC output, which can generate a high-density sine wave of 2000 points per week for the base wave, greatly improving the quality of the waveform and enhancing the accuracy of the tester.
7. The power amplifier adopts high fidelity linear power amplifier, which ensures the accuracy of small current and the stability of large current.
8. It uses a USB interface to communicate directly with a PC without the need for an adapter cable, making it convenient to use.
9. Can be connected to a laptop (optional) for operation. Laptops and industrial computers use the same software, so there is no need to relearn the operating methods.
10. Equipped with GPS synchronization test function. The device can be equipped with a built-in GPS synchronization card (optional) and connected to a PC through an RS232 port, enabling two testers to perform synchronous testing in different locations.

technical parameter
1. AC current source
Single phase current output (effective value): 0-10A/phase, accuracy: 0.1% ± 5mA
Three phase parallel output (effective value): 0-30A/Three phase in-phase parallel output
Long term allowable operating value (effective value) of phase current: 5A
Maximum output power per phase: 100VA
Maximum output power of three-phase parallel current: 300VA
Maximum output allowable working time of triple current: 5s
Frequency range: 0-1000Hz, accuracy 0.01Hz
Harmonic frequency: 2-20 times
Phase: 0-360 °, accuracy 0.1 °
2. DC current source
DC current output: 0- ± 5A/phase, accuracy: 0.2% ± 5mA
3. AC voltage source
Single phase voltage output (effective value): 0-120V/phase, accuracy: 0.1% ± 5mV
Line voltage output (effective value): 0-240V
Phase voltage/line voltage output power: 40VA/60VA
Frequency range: 0-1000Hz, accuracy: 0.01Hz
Harmonic frequency: 2-20 times
Phase: 0-360 °, accuracy: 0.1 °