CN209102805U - A kind of midium voltage cable shielded layer narrowband carrier access impedance test system - Google Patents
A kind of midium voltage cable shielded layer narrowband carrier access impedance test system Download PDFInfo
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- CN209102805U CN209102805U CN201820909806.6U CN201820909806U CN209102805U CN 209102805 U CN209102805 U CN 209102805U CN 201820909806 U CN201820909806 U CN 201820909806U CN 209102805 U CN209102805 U CN 209102805U
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Abstract
The utility model provides a kind of test macro of midium voltage cable shielded layer narrowband carrier access impedance, it mainly include PC machine, signal generator, operational amplifier, isolated location, injection inductive coupler, data collecting card for testing impedance when midium voltage cable shielded layer carrier channel.Corresponding testing procedure has: (1) installing injection inductive coupler additional in cable shield；(2) signal is injected by operational amplifier, isolated location by cable shield by PC machine control signal generator；(3) data collecting card receives the impedance data of shielded layer coupling circuit；(4) impedance curve is fitted according to acquisition data.The utility model test method can accurately portray the following frequency point impedance data of 500kHz and with frequency variation tendency, can provide data supporting for the correlative study of midium voltage cable shielded layer.And the test method overcomes the resonance method can only test the deficiency of single frequency point, and it is simpler than voltammetry circuit structure, more for general applicability.
Description
Technical field
The utility model relates to a kind of midium voltage cable shielded layer narrowband carriers to access impedance test system.
Background technique
Currently, domestic power distribution automation communication network mainly uses fiber optic communication mode (EPON), however it is logical in fibre-optic terminus
During believing access network construction, because the old distribution line in part is collapsed using direct-buried mode or cable channel, municipal administration pick road hand
Renewal reason is difficult, and fiber cable laying difficulty is big, cost of investment is high；Wireless public network (mainly using GPRS/3G/4G) is although can be used as
The subsidiary communications mode of power distribution automation, but there are jitter, safety is weak the problems such as, it is therefore desirable to a kind of new communication
Supplement of the technology as both communication technologys.Power line carrier (Power Line Carrier, PLC) is made using power line
For a kind of communication technology that transmission medium carries out data transmission, have many advantages, such as that small investment, equipment are simple, the construction period is short, it can
A kind of effective means of supplementing out economy as communication access net.And representative channel of the midium voltage cable shielded layer as power line carrier, it grinds
Study carefully its shielded layer impedance operator and we are preferably designed with electric line carrier communication equipment with particularly significant realistic meaning.
Midium voltage cable shielded layer is the middle pressure component part of cable, is had strictly in the factory test of cable, in-site installation
Requirement.Its original design intention is not intended to data transmission and communication, for communication channel, needs to fully understand its channel biography
Defeated characteristic, and carrier wave access impedance operator is one of important feature of transmission.The carrier wave of midium voltage cable shielded layer accesses resistance
The anti-equivalent impedance for referring to the cable shield at signal transmission.Its impedance operator is by frequency, signal on-position, shielded layer
The many factors such as earth current influence, have a significant impact to the feedback net efficiency and transmission performance of carrier telecommunication equipment, be conduct
The important performance indexes of power line carrier communication channel.
Existing power line carrier access impedance is primarily present following problems:
(1) relevant research achievement is directed to low-voltage power line mostly, accesses impedance operator for the shielded layer of medium-voltage line
It studies seldom.
(2) existing test method mainly has the resonance method, voltammetry, and wherein the resonance method can only test the impedance of single frequency point
Value, cannot obtain continuous impedance operator；Structure is complicated for the test environment of voltammetry, equipment is expensive, and live actual test difficulty is big,
It is unfavorable for generally testing.
Utility model content
In order to overcome the shortcomings of existing test method, the utility model provides a kind of midium voltage cable shielded layer narrowband carrier
Impedance test system is accessed, new method and thinking are provided for midium voltage cable shielded layer Impedance Research.This method test is easy
It is feasible, it is suitble to the large-scale impedance collection in scene and research promotion.
To achieve the above object, the utility model takes following scheme:
The utility model provides a kind of midium voltage cable shielded layer narrowband carrier access impedance test system, the test macro
It mainly include PC machine, signal generator, operational amplifier, isolated location, injection inductive coupler, data collecting card；It is described
PC machine, signal generator, operational amplifier, isolated location, injection inductive coupler, data collecting card be attached.
2, the PC machine generates swept-frequency signal by driving control signal generator, and the swept-frequency signal is passed through operation, put
Greatly, midium voltage cable shielded layer is coupled to by pouring-in coupler by isolated location, data collecting card is by the access of shielded layer
Impedance data is acquired by coupler, isolated location, is transmitted to PC machine.
3, the signal generator is direct digital synthesiser, and it is 80kHz that the direct digital synthesiser, which generates frequency,
The swept-frequency signal of~500kHz generates swept-frequency signal by the drive control of PC machine.
4, the isolated location realizes forceful electric power signal and light current between data collecting card and injection inductive coupler
The isolation of signal.
5, the injection inductive coupler is serially connected on midium voltage cable shielded layer, realizes the impedance to shielding layer impedance
The coupling of transformation and swept-frequency signal, the primary coil and secondary coil no-load voltage ratio of pouring-in coupler are 1: 1.
Compared with existing test method and technology, the advantage of the utility model is:
(1) the utility model power line carrier frequencies range 80kHz~500kHz, can be to the narrowband carrier of specification definition
The channel impedance of frequency range measures assessment, mentions to the midium voltage cable shielded layer communication channel of research 80kHz~500kHz
Research method and thinking are supplied.
(2) test macro provides system in the access impedance that cable shield is applied for research medium voltage power line carrier wave
Test method.
(3) test macro builds convenience, easy to operate, suitable on-the-spot test.
Detailed description of the invention
Fig. 1 is the midium voltage cable shielded layer narrowband carrier access impedance test system structural representation in the present utility model
Figure.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawing.
Such as Fig. 1, the utility model provides a kind of midium voltage cable shielded layer narrowband carrier access impedance test system, the survey
Test system mainly includes PC machine, signal generator, operational amplifier, isolated location, injection inductive coupler, data acquisition
Card；The PC machine, signal generator, operational amplifier, isolated location, injection inductive coupler, data collecting card carry out
Connection.
Reference waveform of the PC machine for control signal generator to enable signal generator to generate has: sine wave,
The signal with different type such as square wave, impulse wave, sawtooth wave, noise waves meet acquisition demand.
The isolated location realizes forceful electric power signal and light current letter between data collecting card and injection inductive coupler
Number isolation.
The injection inductive coupler is serially connected on midium voltage cable shielded layer, realizes that the impedance to shielding layer impedance becomes
The coupling with swept-frequency signal is changed, the primary coil and secondary coil no-load voltage ratio of pouring-in coupler are 1: 1.
The above description is only the embodiments of the present invention, and therefore it does not limit the scope of the patent of the utility model, all
Equivalent structure or equivalent flow shift made based on the specification and figures of the utility model, is applied directly or indirectly in
Other related technical areas are also included in the patent protection scope of the utility model.
Claims (5)
1. a kind of midium voltage cable shielded layer narrowband carrier accesses impedance test system, which is characterized in that the test macro is main
Including PC machine, signal generator, operational amplifier, isolated location, injection inductive coupler, data collecting card；The PC
Machine, signal generator, operational amplifier, isolated location, injection inductive coupler, data collecting card are attached.
2. midium voltage cable shielded layer narrowband carrier according to claim 1 accesses impedance test system, it is characterised in that: institute
It states PC machine and swept-frequency signal is generated by driving control signal generator, the swept-frequency signal is single by isolation by operation, amplification
Member is coupled to midium voltage cable shielded layer by pouring-in coupler, and the access impedance data of shielded layer is passed through coupling by data collecting card
Clutch, isolated location are acquired, and are transmitted to PC machine.
3. midium voltage cable shielded layer narrowband carrier according to claim 1 accesses impedance test system, it is characterised in that: institute
The signal generator stated is direct digital synthesiser, and it is sweeping for 80kHz~500kHz that the direct digital synthesiser, which generates frequency,
Frequency signal generates swept-frequency signal by the drive control of PC machine.
4. midium voltage cable shielded layer narrowband carrier according to claim 2 accesses impedance test system, it is characterised in that: institute
Isolated location is stated between data collecting card and injection inductive coupler, realizes the isolation of forceful electric power signal and weak electric signal.
5. midium voltage cable shielded layer narrowband carrier according to claim 2 accesses impedance test system, it is characterised in that: institute
Stating injection inductive coupler is serially connected on midium voltage cable shielded layer, is realized and is believed the impedance transformation of shielding layer impedance and frequency sweep
Number coupling, the primary coil and secondary coil no-load voltage ratio of pouring-in coupler are 1: 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820909806.6U CN209102805U (en) | 2018-06-06 | 2018-06-06 | A kind of midium voltage cable shielded layer narrowband carrier access impedance test system |
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| CN201820909806.6U CN209102805U (en) | 2018-06-06 | 2018-06-06 | A kind of midium voltage cable shielded layer narrowband carrier access impedance test system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111610370A (en) * | 2019-05-23 | 2020-09-01 | 青岛鼎信通讯股份有限公司 | 10kV line impedance detection device |
| CN111614376A (en) * | 2020-03-05 | 2020-09-01 | 国网青海省电力公司果洛供电公司 | Medium voltage power line impedance test system based on medium voltage carrier communication device |
| CN114520674A (en) * | 2022-04-20 | 2022-05-20 | 青岛鼎信通讯股份有限公司 | Low-voltage line carrier communication signal input impedance characteristic test method |
-
2018
- 2018-06-06 CN CN201820909806.6U patent/CN209102805U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111610370A (en) * | 2019-05-23 | 2020-09-01 | 青岛鼎信通讯股份有限公司 | 10kV line impedance detection device |
| CN111614376A (en) * | 2020-03-05 | 2020-09-01 | 国网青海省电力公司果洛供电公司 | Medium voltage power line impedance test system based on medium voltage carrier communication device |
| CN114520674A (en) * | 2022-04-20 | 2022-05-20 | 青岛鼎信通讯股份有限公司 | Low-voltage line carrier communication signal input impedance characteristic test method |
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