HYRT-60 series of digital power line carrier communication system is developed by our company development, using advanced DSP digital circuit and digital signal processing technology and the latest communication components, according to the IEC recommendations and national standards, a new power line is suitable for 220kV and below voltage levels of communication equipment.
2, the main performance characteristics
2.1 main technical indicators in line with international standards and national standards GB7255-1998 IEC495 "single sideband power line carrier technology conditions".
2.2 with the DSP digital signal processing technology and advanced algorithm to optimize the design of digital filter, so it was not affected by the external environment, temperature, improve the anti-interference ability of the system.
2.3 in order to adapt to the power line complex, AGC automatic gain control and adjustment of using DSP digital processing technology to measure, receiving level calculation, hierarchical control, high precision, wide range, output level is less than ± 0.5dB in the range of 65dB; the adjustment time is less than 2S, improves the reliability of the carrier wave communication, cancel the complicated process operation manual measurement, adjust the receiving level.
2.4 using digital frequency synthesis, digital frequency discrimination and digital filtering technology, the pilot, the pilot signal is more accurate, reliable, accurate rate to further improve the dial.
2.5 the high stability crystal oscillator and the latest digital PLL frequency synthesis technology, so that the carrier frequency stability and accuracy of ± 1 × 10.
2.6 this machine, transmission spectrum were used to determine the program code, in the carrier frequency range can be easily set up in the field of replacement line spectrum.
2.7 the machine multiplexing performance is good, effective voice transmission frequency band is 300HE ~ 3700HZ, multiplex transmission of voice, data, remote bell pilot and pilot signal.
The circuit and components selection, 2.8 stable reliability, and the thermal design and component derating and other methods, to improve the reliability of equipment.
2.9 this machine and high frequency carrier frame by frame two ways of working.
2.10 consider the on-site operation, this machine panel is provided the necessary measuring hole and adjustable potentiometer and working state indicator, the maintenance personnel in maintenance energy measurement, judge more convenient and timely troubleshooting.
2.11 with the 800Hz signal level automatic testing function. Off hook dial "9", can control the end machine automatic echo 800Hz signal, complete the testing work of the whole passage in the single end can be. During the 800Hz signal detection, does not affect the normal transmission of telecontrol signal.
2.12 800Hz test signal, 450Hz busy tone, ring back tone, call signal, the pilot signal and bell flow oscillation signal, by DSP digital signal processor control, thus reducing the hardware circuit, the signal accuracy.
The system adopts microcomputer control automatic 2.13 local exchange, provide four users: I, II users can do ordinary users can also sound to user, user can do flexible user III as well as trunk, the user can be used as a normal user IV as well as priority user, also can do the trumpet line to extend the user; user four door internal exchange, in the party, have mutual transfer function between users; priority user has forced into function; this machine and various switches or other communication equipment network provides rich interface features: the A. loop exhaled relay line interface; B. two-wire or four wire E/M interface; C. switch trumpet line extension; realize automatic two-way relay D. using small line.
2.14 this machine adopts the new type of VMOS field effect transistor switching power supply, the permissible voltage change range, high efficiency, power amplifier using a separate power supply, reduce the interference and influence power circuit of the carrier frequency of the system, improve the reliability and anti-interference ability; the 220V AC and DC 48V power supply, and can realize the no automatic switching power supply interference; with overcurrent, overvoltage protection function.
2.15 low power (optional): in the DC power supply, if the channel is idle, the machine can be set to low power wait state, power consumption down to about 28W, battery capacity smaller can keep a long working time, reduce the DC standby power investment.
Digital power line carrier communication system
1 Overview
Power line HYRT-70 series digital carrier communication system is developed by our company development, using advanced DSP digital circuit and digital signal processing technology and the latest communication components, according to the IEC recommendations and national standards, the new power line communication equipment for 220kV and below voltage grade. It inherits our HYRT-60 series analog carrier expertise, and learn from foreign advanced technology products, performance of the carrier are further improved.
2 advanced digital technology
The number of the current advanced technology in communication field: multi CPU technology, DSP digital signal processing technology, to realize the transmission of multi-path voice and data on 4 kHz carrier frequency band, and the control and management of carrier.
The communication device specific interface circuit, coding circuit, analog voice signal sampling and analog to digital conversion of voice signal, digital signal of the transmission process, solve the simulated carrier with analog voice information transmission noise separation and signal distortion in the process of transmission, so as to get clean voice.
Switching power supply and power module using the new technology of soft switch as the classification power source, and improving the stability of the operation efficiency, reliability and equipment.
Using high stability crystal oscillator and the new digital PLL frequency synthesis technology and components, so that the carrier frequency stability and accuracy of better than 1 × 10-6.
3 high reliability design
The circuit and components used for stability, reliability, and the thermal design and component derating and other methods, to improve the reliability of equipment.
Use a large number of highly integrated circuit to reduce power consumption, miniaturization.
SMT surface mount technology, reduces the volume of the equipment, improve equipment reliability.
450HZ busy tone, ring back tone and ringing current oscillation signal, are controlled by microcomputer, reduce the hardware circuit, improving the reliability of the circuit and signal accuracy.
Use a large number of simple debugging, stable and reliable active filter and a switched capacitor filter, reduce the volume, improve reliability, improve the channel frequency characteristic.
Switching power supply using the new soft switching technique is excellent, the permissible voltage change range, high efficiency, low heat.
Power amplifier using a separate power supply, reduce the interference and influence power circuit of the carrier frequency of the system, improve the reliability and anti-interference ability.
The AC / DC 220V or -48V power supply, can realize the automatic switching without interference. The power of the flow / overvoltage protection function.
