One.Overview
JT - QX series of harmonic elimination device, in view of the power system because of the ferromagnetic resonance and frequent voltage transformer (PT) burning explosion even malignant accidents, on the basis of solicit opinions from the user, the development and production of a new type of intelligent harmonic elimination device. With high performance DSP chip as the core, the high-power, non-contact harmonic elimination components exports, with liquid crystal display (LCD), signal lights, touch buttons as the man-machine interface, with intelligent software, formed the principle and technology advanced, simple to use convenient smart resonance diagnosis and elimination, recording device. Compared with similar devices, it has the characteristics of high integration, strong anti-interference ability, small size, light weight and quick action. 
Two. Device characteristics
1. High reliability: USES the overseas advanced high-speed DSP CMOS chip and industrial-grade chip, unique design, electromagnetic shielding, the hardware and software redundancy, running speed, strong anti-interference ability, low power consumption characteristics;
2. The screen adopts wide temperature liquid crystal display, which can be used for man-machine dialogue and easy operation;
3. Good temperature performance, fast conversion speed and high measurement accuracy of high quality analog-digital converter;
4. Rich communication interface: rs-485, rs-232, Ethernet port (optional). Applicable to unattended substation or integrated automation equipment;
5. The fault recording information can be displayed on the LCD screen for 20 times of grounding fault, and the information is not lost after the device is switched off.
6. The monitoring and alarm function of 3Uo;
7. Have the right time function (optional feature).
Three. Device technical index
1. Work power: device power consumption: no more than 30W AC220V plus or minus 10% 50Hz.
DC220V plus or minus 10% (please declare the goods in advance);
2. Detuning number: 1-4 road;
3. Detuning frequency: three frequency, half frequency, basic frequency, double frequency, triple frequency, four times frequency, five times frequency, six times frequency, seven times frequency;
4. The harmonic voltage amplitude can be set 0 ~ 200V, and the detection range is 5 ~ 150V, and the measurement error is not greater than 2%.
5. Contact capacity of alarm relay: DC30V/2A, AC220V/5A;
6. Resonant and 3Uo limit record 20, and no loss of power;
7. Communication interface: RS485 or RS232, Ethernet port (optional);
8. Protocol: DISA and Modbus regulations are optional;
9. Baud rate: 1200bps, 2400bps, 4800bps, 9600bps, 19200bps optional;
10. Time function: B code pairs (optional).