CN207198560U - Intelligent substation IRIG B code time dissemination systems - Google Patents

Abstract

The utility model provides a kind of intelligent substation IRIG B code time dissemination systems, including IRIG B codes time service device, the first light path circuit converter, the second light path circuit converter and some power quality equipments；The IRIG B codes time service device connects the first light path circuit converter by RS485 electrical property of twisted pair；The first light path circuit converter connects the second light path circuit converter by optical fiber；The second light path circuit converter connects the power quality equipment by RS485 electrical property of twisted pair；The first light path circuit converter and the second light path circuit converter include the power interface circuit and function conversion circuit being electrically connected with respectively.The utility model has that time signal waveform is good, time service precision is high, can effectively resist the advantages of electromagnetic interference.

Description

Intelligent substation IRIG-B code time dissemination systems

Technical field

The utility model belongs to field of electrical equipment, and in particular to a kind of intelligent substation IRIG-B code time dissemination systems.

Background technology

Timing code IRIG-B is a kind of time standard that the Range Command committee of the U.S. formulates.IRIG-B codes are compiled for pulsewidth Code, transmission rate is 1 frame/second, and a frame data are made up of 100 symbols, and the width of each code element is 10ms, the data of each frame Comprising year, day, when, the information such as minute, second, by time service equipment by receiving and parsing through IRIG-B code information, to proofread local clock Time.So to ensure that each code element information will reliably, be correctly transmitted during in IRIG-B codes pair.

In intelligent substation time dissemination system, the mainly IRIG-B code time service modes by RS-485 level and the event in station When hindering the automation equipments pair such as recording, protection, observing and controlling and Computerized monitor system.But by this way with the equipment time service in station When, stand in observing and controlling or protection equipment can be random report pair when exception or time hopping phenomenon, it is necessary to make improvements.

Therefore it is badly in need of wanting the intelligence that a kind of time signal waveform is good, time service precision is high, can effectively resist electromagnetic interference Transformer station IRIG-B code time dissemination systems.

Utility model content

The purpose of this utility model is to provide a kind of intelligent substation IRIG-B code time dissemination systems, is awarded with solving prior art When swinging of signal, by electromagnetic interference influence it is big the problem of.

The utility model provides following technical scheme：

A kind of intelligent substation IRIG-B code time dissemination systems, including IRIG-B codes time service device, the first light path circuit conversion Device, the second light path circuit converter and some power quality equipments；The IRIG-B codes time service device passes through RS485 twisted-pair feeders It is electrically connected with the first light path circuit converter；The first light path circuit converter connects second light path by optical fiber Circuit converter；The second light path circuit converter connects the power quality equipment by RS485 electrical property of twisted pair；It is described First light path circuit converter and the second light path circuit converter include the power interface circuit and work(being electrically connected with respectively Can change-over circuit.

Preferably, the function conversion circuit includes the first ALT-CH alternate channel and the second ALT-CH alternate channel, and first conversion is logical Road includes the RS485 input modules that are electrically connected with successively, difference turns Single-end output module, driving output module and light send mould Block, second ALT-CH alternate channel include the Optical Receivers, driving output module, single-ended transfer difference output mould being electrically connected with successively Block and RS485 output modules.

Preferably, the power interface circuit includes power supply chip and the protection being electrically connected with power supply chip electricity Road, the protection circuit include some protection electric capacity and are connected in parallel on the TVS pipe of the power supply chip output end.

Preferably, the RS485 input modules and the RS485 output modules include RS485 interface circuits, described RS485 interface circuits are used for the mutual conversion for realizing single-ended signal and differential signal.

Preferably, the RS485 interface circuits include RS485/RS422 transceivers and are electrically connected with the RS485/ The difference power port protection circuit of RS422 transceiver output ends.

Preferably, the optical transmission module and the Optical Receivers include optical module interface circuit, and the optical module connects Mouth circuit includes ST joint light transceiving chips.

The beneficial effects of the utility model are：

Using two light path circuit converters, the IRIG-B codes electric signal or optical signal of input are mutually changed, carried The electromagnetism interference of high-transmission circuit and the reliability of time service, reduce transmission line is influenceed by electromagnetic interference；Using electricity Source interface circuit, and the RS485 interface circuits and optical module interface circuit coordinated, further ensure the security of whole system Can be with the stability of signal transmission.

Brief description of the drawings

Accompanying drawing is used for providing further understanding to of the present utility model, and a part for constitution instruction, with this practicality New embodiment is used to explain the present invention together, does not form to limitation of the present utility model.In the accompanying drawings：

Fig. 1 is Tthe utility model system structural representation；

Fig. 2 is light path circuit converter inner function module schematic diagram；

Fig. 3 is power interface circuit schematic diagram；

Fig. 4 is difference power port protection circuit schematic diagram；

Fig. 5 is optical module interface circuit schematic diagram；

In figure：1.IRIG-B code time service devices, 2. first light path circuit converters, 21. power interface circuits, 22.RS485 Input module, 23. difference turn Single-end output module, 24. driving output modules, 25. optical transmission modules, 26. Optical Receivers, 27. output module is driven, 28. single-ended transfer difference output modules, 29.RS485 output modules, 3. second light path circuit converters, 4. power quality equipment, 5. power supply chips, 6.TVS pipes, 7.RS485/RS422 transceivers, 8. difference power port protection circuits, 9.ST Joint light transceiving chip.

Embodiment

As shown in Figures 1 to 5, a kind of intelligent substation IRIG-B code time dissemination systems, including IRIG-B codes time service device 1, First light path circuit converter 2, the second light path circuit converter 3 and some power quality equipments 4；IRIG-B codes time service device 1 First light path circuit converter 2 is connected by RS485 electrical property of twisted pair；First light path circuit converter 2 passes through optical fiber connection the Two light path circuit converters 3；Second light path circuit converter 3 connects power quality equipment 4 by RS485 electrical property of twisted pair；The One light path circuit converter 2 and the second light path circuit converter 3 include power interface circuit 21 and the function being electrically connected with respectively Change-over circuit.Function conversion circuit includes the first ALT-CH alternate channel and the second ALT-CH alternate channel, and the first ALT-CH alternate channel includes electrical successively The RS485 input modules 22 of connection, difference turn Single-end output module 23, driving output module 24 and optical transmission module 25, and second ALT-CH alternate channel includes the Optical Receivers 26, driving output module 27, the and of single-ended transfer difference output module 28 being electrically connected with successively RS485 output modules 29.Power interface circuit 21 includes power supply chip 5 and the protection circuit being electrically connected with power supply chip 5, Protection circuit includes some protection electric capacity and is connected in parallel on the TVS pipe 6 of the output end of power supply chip 5.The He of RS485 input modules 22 RS485 output modules 29 include RS485 interface circuits, and RS485 interface circuits are used for the phase for realizing single-ended signal and differential signal Mutually conversion.RS485 interface circuits include RS485/RS422 transceivers 7 and electric connection RS485/RS422 transceivers 7 export The difference power port protection circuit 8 at end.Optical transmission module 25 and Optical Receivers 26 include optical module interface circuit, optical module interface Circuit includes ST joint light transceiving chip 9.

Specifically, in actual motion and detection process, the influence to caused by time dissemination system for verifying electromagnetic interference, Test equipment is put into EMC electromagnetic compatibilities laboratory and carries out electrical fast transient (eft) test and the survey of surge (impact) immunity to interference Examination, for verifying switching of the mechanical switch to inductive load in lightning, earth fault or circuit, the shadow to caused by electrical system The influence of transient or excessively stream to time dissemination system caused by sound and thunder and lightning, switches of power system switching.After test, Draw, when the timing of transmission range one, the quantity of RS-485 bus drivers load is more, pair when signal peak-to-peak value it is smaller, rising edge Time is longer, and time service precision deviation is bigger, and the waveform of output signal is distorted and small oscillating waveform；Work as driving load The timing of quantity one, transmission line distance is longer, and the amplitude of output signal is influenceed less, and the rising time of signal is elongated, awards When accuracy error also become big, small distortion also occurs for signal waveform.Therefore the first light path circuit converter 2 and the second light path are used Circuit converter 3, whole station time synchronized is realized using optical fiber transmission medium.

Wherein, as shown in Figures 1 to 5, power interface circuit input voltage range be 85~264VAC or 100~ 370VDC, output voltage 5V/1A.And the power interface circuit has short-circuit protection, excessively stream and over-voltage protecting function. RS485 interface circuit major functions are to realize the mutual conversion of single-ended signal and differential signal, therefore in order to improve single-ended signal With the conversion time of differential signal and ensure the reliability of data transfer, from a low-power consumption half-duplex of MAXIM companies RS485/RS422 transceivers 7, its satisfaction ± 15kV electrostatic-proof functions, differential conversion time delay within 15ns, and in order to The interference of surge and ringing pulse is prevented, in differential interface output end design difference power port protection circuit 8.And in optical module interface In circuit, from a ST joints light transceiving chip 9 of AVAGO companies, it supports 50/125 μm, 62.5/125 μm, 100/140 μm multimode fibre, signal transmission rate is up to 1.5km up to 160 megabaud, transmission range, in optical module interface electricity In the design of the output circuit on road, the time on the rise/fall edge of light emitting diode, its allusion quotation are reduced using frequency compensated method Offset is 3ns；Apply a small pre-bias voltage in the driving circuit and reduce the propagation delay time, its shake representative value is 1ns。

After being analyzed more than, system emulation environment as shown in Figure 1 is built, and test as follows：

1. test system wiring.The IRIG-B codes time signal of 2 road RS-485 level is changed by circuit optical path converter Into optical signal, then optical signal is transferred to by time service equipment receiving terminal by 30m and 100m fiber medium respectively, in receiving terminal RS485 signals are converted into by light path circuit converter again.

2. wait each equipment time service success.The IRIG-B codes time signal of RS485 nodes output passes through light path circuit conversion Device and fiber medium access on time service equipment, are waited all power quality equipment time service successes.

3. the test and analysis of test data.The optical fiber transmission medium of system at this pair is put into electromagnetic interference Under laboratory environment, distinguish test waveform and output bias with oscillograph and time synchronization tester, draw knot as shown in the table Fruit：

Test point

Transmission range

Driving force

Peak-to-peak value

Rising edge

Accuracy error

Remarks

1

30 meters

4 tunnels

3.52V

78ns

200ns

Waveform is undistorted

2

100 meters

4 tunnels

3.68V

81ns

330ns

Waveform is undistorted

Shown by the data result measured, output RS485 level IRIG-B codes time signals are passed through into light path circuit conversion When device is converted to optical signal and is transmitted, have time signal waveform good, time service precision is high, can effectively resist electromagnetic interference The advantages of.

Preferred embodiment of the present utility model is the foregoing is only, is not limited to the utility model, although ginseng The utility model is described in detail according to previous embodiment, for those skilled in the art, it still can be with Technical scheme described in foregoing embodiments is modified, or equivalent substitution is carried out to which part technical characteristic.It is all Within the spirit and principles of the utility model, any modification, equivalent substitution and improvements made etc., this practicality should be included in Within new protection domain.

Claims (6)

1. a kind of intelligent substation IRIG-B code time dissemination systems, it is characterised in that including IRIG-B codes time service device, the first light path Circuit converter, the second light path circuit converter and some power quality equipments；The IRIG-B codes time service device passes through RS485 Electrical property of twisted pair connects the first light path circuit converter；The first light path circuit converter connects described by optical fiber Two light path circuit converters；The second light path circuit converter connects the quality of power supply by RS485 electrical property of twisted pair and set It is standby；The first light path circuit converter and the second light path circuit converter include the power interface electricity being electrically connected with respectively Road and function conversion circuit.

2. a kind of intelligent substation IRIG-B code time dissemination systems according to claim 1, it is characterised in that the function turns Changing circuit includes the first ALT-CH alternate channel and the second ALT-CH alternate channel, and first ALT-CH alternate channel includes the RS485 being electrically connected with successively Input module, difference turn Single-end output module, driving output module and optical transmission module, and second ALT-CH alternate channel is included successively Optical Receivers, driving output module, single-ended transfer difference output module and the RS485 output modules of electric connection.

3. a kind of intelligent substation IRIG-B code time dissemination systems according to claim 1, it is characterised in that the power supply connects Mouth circuit, which includes power supply chip and the protection circuit being electrically connected with the power supply chip, the protection circuit, includes some guarantors Shield electric capacity and the TVS pipe for being connected in parallel on the power supply chip output end.

A kind of 4. intelligent substation IRIG-B code time dissemination systems according to claim 2, it is characterised in that the RS485 Input module and the RS485 output modules include RS485 interface circuits, and the RS485 interface circuits are used to realize single-ended letter Mutual conversion number with differential signal.

A kind of 5. intelligent substation IRIG-B code time dissemination systems according to claim 4, it is characterised in that the RS485 Interface circuit includes RS485/RS422 transceivers and is electrically connected with the differential electrical of the RS485/RS422 transceivers output end Mouth protection circuit.

6. a kind of intelligent substation IRIG-B code time dissemination systems according to claim 2, it is characterised in that the light is sent Module and the Optical Receivers include optical module interface circuit, and the optical module interface circuit includes ST joints light transmitting-receiving core Piece.