CN2384377Y - Digital transmitter for low-speed data and high-frequency protection of high-voltage transmission line - Google Patents

Abstract

The utility model relates to a digital transmitter for low-speed data and high-frequency protection of a high-voltage transmission line. The utility model comprises a casing body. The utility model is characterized in that a carrier generator, a clock generator, a modular two adder, two upper pseudo-random sequence generator, a multiplier and various circuits, such as a band pass power amplification circuit, etc., are arranged in the casing body. Because the utility model adopts a digitized technology, the response speed is quick, information is accurate without error, time is won for improving protection, the safety of a heavy current installation is protected in a much better way, the utility model can transmit more supplementary protection signals simultaneously, and the utility model is much more reasonable and perfect. The utility model has the advantages of high reliability and low signal transmitting power. The utility model can select frequency bands, reduces interference and can be used as normal open equipment to run.

Description

The high voltage transmission line low speed data carrier current protection Digital Transmission machine of holding concurrently

The utility model relates to a kind of isolated plant of electronic communication, specifically relates to a kind of high voltage transmission line low speed data carrier current protection Digital Transmission machine of holding concurrently.

Used in the past both at home and abroad carrier current protection technical point two classes, a class are to use the multiplexing protection of analog carrier machine that high voltage transmission line puts into operation, and it isolates high-frequency protecting signal with filter, carry out the protection action of electrical equipment with control.Another kind of for own special-purpose transceiver is set, have or not to come the execute protection action with mutual signalling.The former is because poor reliability also is subjected to the restriction of carrier terminal equipment, so most at present employing latter.But the latter just begins to start signalling device when transmission line is out of order, because signal has restriction settling time, its response speed is slower.For guard signal is received reliably, its sender adopts the post a letter power more powerful than carrier terminal equipment in addition, has disturbed the analog carrier machine and the wireless device of other operation, so have to give the given frequency range of carrier current protection when passage is divided, has wasted frequency resource.

The high voltage transmission line low speed data that the purpose of this utility model just is to provide that a kind of reliability is higher, response speed very fast, can the save frequency resource carrier current protection Digital Transmission machine of holding concurrently.

The purpose of this utility model can realize by following measure:

The utility model comprises housing, is provided with carrier generator, clock generator, modular two addition device in housing, two pseudo-random sequence generators, multiplier, the logical power amplifier of bands, filter joint, band pass filter, synchronizer, despreader, demodulator, information generate interface; Wherein, carrier generator, multiplier, the logical power amplifier of band, filter joint and band pass filter be one-way transmission successively, and from carrier generator output until being input to band pass filter, clock generator is input to carrier generator and pseudo-random sequence generator respectively, pseudo-random sequence generator is connected to the modular two addition device, the modular two addition device is transferred to multiplier, band pass filter exports synchronizer and despreader respectively to, synchronizer is connected to pseudo-random sequence generator, pseudo-random sequence generator outputs to despreader, despreader is connected to demodulator, and demodulator exports information to and generates interface.

Because the utility model adopts digitizing technique; shortcomings such as reliability is relatively poor, response speed slow, frequency resource use deficiency have been overcome; can also transmit some symbols more and add guard signal; thereby trend towards more rationally with perfect; this machine is a privacy protection equipment; need not be multiplexed on the miscellaneous equipment, for the reliability of protecting provides guarantee.This machine power just in the past 1/tens of sender power of posting a letter, frequency range can be appointed and selected, and is arbitrarily variable, thereby reduced the interference to other operational outfit on the circuit, can do that often to offer received shipment capable.Its response speed is fast, and information is accurate, has won the time, has protected the safety of heavy current installation better for improving protection.

Accompanying drawing drawing of the present utility model is described as follows:

Fig. 1 is a shape assumption diagram of the present utility model.

Fig. 2 is a schematic block circuit diagram of the present utility model.

Fig. 3 is circuit theory diagrams of the present utility model.

The utility model is done explanation in further detail below in conjunction with drawings and Examples:

As shown in the figure: the utility model comprises housing, is provided with carrier generator (1), clock generator (2), modular two addition device (3), two pseudo-random sequence generators (4) (9), multiplier (5), the logical power amplifier (6) of band, filter joint, band pass filter (7), synchronizer (8), despreader (10), demodulator (11), information generation interface (12) in housing; Wherein, carrier generator (1), multiplier (5), the logical power amplifier (6) of band, filter joint and band pass filter (7) be one-way transmission successively, and from carrier generator (1) output until being input to band pass filter (7), clock generator (2) is input to carrier generator (1) and pseudo-random sequence generator (4) respectively, pseudo-random sequence generator (4) is connected to modular two addition device (3), modular two addition device (3) is transferred to multiplier (5), band pass filter (7) exports synchronizer (8) and despreader (10) respectively to, synchronizer (8) is connected to pseudo-random sequence generator (9), pseudo-random sequence generator (9) outputs to despreader (10), despreader (10) is connected to demodulator (11), and demodulator (11) exports information to and generates interface (12).

Operation principle of the present utility model is as follows: the utility model branch " is posted a letter " and " collection of letters " two unit.Its frame of broken lines " filter joint " exists in former carrier current protection system.In its left side is transmitter unit.External guard mode level is introduced from a end with aerial lug with the code stream of low speed information code, and " clock generator (2) " are a crystal square-wave oscillator.Produce a synchronous square wave oscillation under the control of " carrier generator (1) exists " clock generator (2)." pseudo-random sequence generator (4) " produce pseudo-code and information code and send into " modular two addition device (3) " together and carry out computing under the effect of " clock generator (2) ".The modular two addition device is to meet two to advance one adder, it has played the scrambler effect, scrambler after this computing send " multiplier (5) " to carry out spread spectrum, send " being with logical power amplifier (6) " to amplify the back in the output of A point then, is sent to already present filter joint with the on line placing and finishes signal transmission task.

This machine receiver unit from already present in conjunction with the signal that obtains the filtering sending; be sent to " bandpass filtering (7) " in the machine dish by the B point with on line; band pass filter output two paths of signals; one the tunnel carries out coherent detection for " despreader (10) "; another road is selected synchronizing signal and is sent " synchronizer (8) "; the synchronous pseudo-code of this synchronizer control " pseudo random sequence code generator " output also send " demodulator (11) " to carry out demodulation once more; draw the prime information sign indicating number; this sign indicating number is given " information generates interface (12) "; generate the prime information sign indicating number from the output of b point through changing and shaping, give relay actuator or relevant device with outside on line and finish to protect and move.

This utility model works in 40KHZ～400KHZ band limits, and this example is an example with the 120KHZ frequency range.Its concrete formation and principle division is as follows.

Below the Chinese and English symbolic representation of explanation is: R: resistance.C: electric capacity.L: inductance.T: transformer.X: crystal.IC: integrated circuit (its model is indicated in the accompanying drawings).K: make code switch.W: watt.KHZ: KHz.A: accessory power outlet.B: input socket.: ohm.Vp-p: voltage peak-peak value (volt).MVp-p: voltage honeybee-peak value (millivolt).Kbit/s: kilobits per second.DC-DC: DC-to-DC converter.AC-DC: interchange-DC converter.

A, transmitter unit

Introduce from a point by aerial lug by 50bit/s state information sign indicating number or out of Memory sign indicating number that carrier current protection equipment comes." carrier generator (1) " and " clock generator (2) " is made of IC9, X1, L3, R10.After the device power-on, 13 pin of IC9 by X1, CX, C12 to (the CX value is very little) forms the vibration (because X1 selects the 120KHZ crystal for use) of 120KHZ to ground, because the effect of IC9 inside is respectively at the clock of its 11 pin and 9 pin output 120KHZ and 12KHZ.

Pseudo-random sequence generator (4) " is made of IC1, IC2, C1, C9, R1, R2.R2, C9 constitute power decoupling, and R1, C1 constitute the electrification reset network of IC2.Under their synergy,, and import inner XOR from its 5 pin at the pseudo random sequence code of 3 pin of IC1 output 12KHZ." mould two adds device (3) clearly " logic gates by IC1 inside constitutes.After the pseudo-code of the 50bit/s low speed data of introducing the IC16 pin from a point and introducing 5 pin was passed through its inside " mould two " computing, the operation code of exporting 12KHZ at 4 pin of IC1 was sent to next stage.

" multiplier (5) " (being spread spectrum modulator) is made of IC3, IC4, C2, C3, R3, R4, R5.C3, R3 constitute the negative terminal coupling input of IC4, and C2, R4 constitute the anode coupling input of IC4, and R5 is the negative feedback resistor of amplifier.14 pin of IC3 and 11 pin receive the vibration of 120KHZ and the operation code of 12KHZ respectively, IC3 is under " 0 " and " 1 " of 11 pin operation codes effect, with the vibration correspondence " 0 " of 120KHZ, anode and the negative terminal that " 1 " delivers to amplifier IC4 respectively, 6 pin at IC4 promptly obtain the 120KHZ keying spread-spectrum signal that a 2PSK phase difference is 180 degree, and apread spectrum bandwidth is 24KHZ.Simultaneously, also there is a spot of 120KHZ carrier leak at 6 pin, (utilizing this leakage to be easy to extract synchronizing signal) at receiving terminal, these two signals are sent to " the logical power amplifier (6) of band " together." the logical power amplifier (6) of band " is made of IC5, R6, R7, C4～C8, C10, C11A, C11B, CA, L1, L2, T1.C10, C11A, C11B constitute power decoupling.R6 is a power amplifier anode resistance, and R7 is a negative feedback resistor, and the value of adjusting R7 can be controlled the size of defeated power.L1, C4, C5, C8 constitute the 120KHZ band pass filter, by its frequency-selecting effect, be admitted to 11 pin of IC5 from the digital spread spectrum signal of IC4 6 pin output, amplifying the back exports at IC5 6 pin, give matching transformer T1 after further filtering by C6, L2, C7, be coupled to the A point and give the filter joint that is present in ultra-high-tension power transmission line with the outer, coaxial cable and be sent to collection of letters opposite end through CA.B, receiver unit

Give Q1 base stage by the outer, coaxial electric wire by the introducing of B point from the digital spread spectrum signal that the high voltage transmission line filter joint transmits." band pass filter (7) " are made of Q1, R8～R10, L3, CB, C12, C13, CX.R9, R11, RC are the Q1 emitter resistance, constitute the 120KHZ band pass filter jointly by C12, Q1, L3, CX, C13, and its three dB bandwidth is 24KHZ, and the signal of selecting is sent to next stage by C13.Simultaneously, X1 also selects 120KHZ at the Q1 collector electrode and leaks carrier frequency from amplifying signal, be sent to 3 pin of module M1." synchronizer (8) " are made of module M1 and X1.X1 resonance is in 120KHZ carrier leak, 3 pin of M1 obtain the carrier frequency of 120KHZ and further handle by M1, give 1 pin of IC9 from its 4 pin, simultaneously, the 6 pin output+4.5V high level of M1 send IC9 15 pin, the 12KHZ carrier frequency synchronization of the vibration of control IC 9 and its 1 pin, like this, at its 11 pin and 9 pin just obtained and posted a letter opposite end synchronous 120KHZ and 12KHZ synchronised clock, so that the control " pseudo-random sequence generator (9) " and the opposite end of posting a letter are synchronous.

" pseudo-random sequence generator (9) " are made of IC8, IC7, R13, C18." (4) " of its principle and transmitter unit are identical, and it produces synchronous pseudo random sequence code is sent to IC16 by C16 by IC8 3 pin 6 pin.

" despreader (10) " are made of IC6, C14～C16, C19.C16 is the input coupling capacitance, and C14, C15 are that IC6 requires peripheral electric capacity.IC6 respectively by 1 pin and 6 pin obtain the 120KHZ spread-spectrum signal and with the synchronous pseudo random sequence code of making a start, by the effect of IC6 internal multiplier, be sent to next stage in its 4 pin output despread signal and by C17.

" demodulator (11) " are made of module M2 and C17, C20, R12.C20, R12 constitute the special coupling of level power supply down that reaches at the corresponding levels, and C17 closes electric capacity for the input structure.The 120KHZ synchronised clock that M2 obtains despread signal respectively and sends here from the IC911 pin from its 1 pin and 6 pin respectively is by the inner PSK demodulation of M2, from its 3 pin output opposite end information code of posting a letter.

" information generates interface (12) " is made up of the inner also remaining logic gates of IC8.Import from IC8 6 pin from the information code that M2 3 pin are sent here; by internal action; the 50bit/s state information sign indicating number that is copied into the opposite end of posting a letter at its 4 pin is connected to the output of b point, and introduces carrier current protection relevant device or out of Memory destination by aerial lug from the b point, finishes the transmitting-receiving all processes.

In sum, this machine spreading gain is 101g (24 * 103)/50=101g480 ≈ 27dB, so, only just can be on 220,000 hint roads to transmit protection information with the output of 0.1W power.+ 5V ,+12V ,-12V gets after filtering by the direct current of DC-DC, AC-DC module is defeated.Because and the technical scheme relation is little, is omitted herein.

Claims (1)

1, a kind of high voltage transmission line low speed data carrier current protection Digital Transmission machine of holding concurrently, it comprises housing, it is characterized in that: be provided with carrier generator (1), clock generator (2), modular two addition device (3), two pseudo-random sequence generators (4) (9), multiplier (5), the logical power amplifier (6) of band, filter joint, band pass filter (7), synchronizer (8), despreader (10), demodulator (11), information generation interface (12) in housing; Wherein, carrier generator (1), multiplier (5), the logical power amplifier (6) of band, filter joint and band pass filter (7) be one-way transmission successively, and from carrier generator (1) output until being input to band pass filter (7), clock generator (2) is input to carrier generator (1) and pseudo-random sequence generator (4) respectively, pseudo-random sequence generator (4) is connected to modular two addition device (3), modular two addition device (3) is transferred to multiplier (5), band pass filter (7) exports synchronizer (8) and despreader (10) respectively to, synchronizer (8) is connected to pseudo-random sequence generator (9), pseudo-random sequence generator (9) outputs to despreader (10), despreader (10) is connected to demodulator (11), and demodulator (11) exports information to and generates interface (12).

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