CN206132832U - Zero sequence current carrier signal generating device - Google Patents
Zero sequence current carrier signal generating device Download PDFInfo
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- CN206132832U CN206132832U CN201621080448.XU CN201621080448U CN206132832U CN 206132832 U CN206132832 U CN 206132832U CN 201621080448 U CN201621080448 U CN 201621080448U CN 206132832 U CN206132832 U CN 206132832U
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- sequence current
- carrier signal
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- zero sequence
- signal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The utility model relates to an electric power system phase to earth fault detection technique, concretely relates to zero sequence current carrier signal generating device, including distribution network and transformer substation's generating line, still include zero sequence current carrier signal source and generating line signal receiver, zero sequence current carrier signal installs in the source at the distribution network node of being qualified for the next round of competitions for the zero sequence current signal that draws this node turns into high frequency carrier signal, loop in with distribution network, fault point, the earth, transformer substation's generating line in the zero sequence current carrier signal source, by generating line signal receiver through drawing high frequency carrier signal, acquire zero sequence current's amplitude and phase information. Turn into the high frequency carrier signal who contains zero sequence current amplitude, phase information through the zero sequence current carrier signal source with power frequency zero sequence current signal on joining in marriage electric network line, generating line signal receiver draws high frequency carrier signal, realizes electric wire netting zero sequence current teletransmission and detection, provides the basis for zero sequence current 0.
Description
Technical field
This utility model belongs to Single-phase Earth Fault of Power System detection technique field, more particularly to a kind of zero-sequence current is carried
Ripple signal generation apparatus.
Background technology
In 10kV/35kV power distribution networks, singlephase earth fault is that the modal failure of distribution system is accounted for, circuit total failare
70%～80%.Single-phase earthing not only have impact on the normal power supply of user, and may produce overvoltage, burn out equipment, or even
Cause phase fault and expansion accident.It is very necessary to find out trouble point in time and carry out isolation to trouble point, on the one hand may be used
To improve the reliability to customer power supply, the safe operation of grid equipment on the other hand can be ensured.There is single-phase connecing in power distribution network
During earth fault, one of key character can exactly produce zero-sequence current, and most of Fault Locating Methods are also based on to zero sequence
The analysis of current characteristic, therefore accurately detect zero-sequence current and by this zero-sequence current information transfer to transformer station, it is very
It is necessary.
At present the domestic method for adopting is broadly divided into two kinds：The first be by wireless transmission method, zero-sequence current is mutual
The zero sequence current signal that sensor is extracted is converted into electromagnetic signal by sensor, then by wireless transmission to base station
Interior, it has the disadvantage that signal attenuation and distortion are very serious, it is more difficult to the original zero sequence circuit signal of accurate reproduction.Second is by photoelectricity
Sensor, by the zero sequence current signal that zero sequence current mutual inductor is extracted optical signal is converted into, then is transmitted through the fiber to transformer station
Read, this kind of mode is sufficiently complex, and cost is high, it is impossible to extensive practical.
The detection of mesh first two typical power distribution network zero-sequence current and transmission method, are respectively present that accuracy of detection is high, mode
The problems such as complexity, high cost.
Utility model content
One of the purpose of this utility model is to provide one kind and power distribution network zero-sequence current can accurately be detected, and reliably
The amplitude by the zero sequence current signal, phase information transmit device to substation bus bar.Realize power distribution network zero-sequence current
Detection, for fault location foundation is provided.
To realize one of this utility model purpose, the technical solution adopted in the utility model is：A kind of zero-sequence current carrier wave
Signal generation apparatus, including power distribution network and substation bus bar, also including zero-sequence current carrier signal source and bus signal receiver；
The zero-sequence current carrier signal source is arranged at power distribution network outlet node, for the zero sequence current signal that will be extracted at the node
It is converted into high-frequency carrier signal；The zero-sequence current carrier signal source is formed with power distribution network, trouble point, the earth, substation bus bar
Loop；Bus signal receiver at substation bus bar obtains zero-sequence current by extracting the high-frequency carrier signal
Amplitude and phase information.
In above-mentioned zero-sequence current carrier signal generating meanss, the zero-sequence current carrier signal source includes that access is described
The current transformer of distribution network line, is connected in parallel on the resistance at the current transformer two ends, and is connected in parallel on the double of resistance two ends
To electronic power switch；The break-make of the bidirectional power electronic switch is controlled by high-frequency square-wave signal.
In above-mentioned zero-sequence current carrier signal generating meanss, the bus signal receiver includes a resistance and three
Individual electric capacity, three electric capacity accesses substation bus bar and is connected with a resistance again, and the resistance eutral grounding.
In above-mentioned zero-sequence current carrier signal generating meanss, the high-frequency square-wave signal frequency range is in tens kHz
To hundreds of kHz.
When zero-sequence current carrier signal generating meanss of the present invention are embodied as, resistance is incorporated to by Current Transformer Secondary side
The zero sequence current signal of distribution network line is extracted, and bidirectional power electronic switch is incorporated at the resistance two ends；Use frequency band range number
The high-frequency square-wave signal control bidirectional power electronic switch of ten kHz to hundreds of kHz is opened and shut-off, so as to resistance two ends with
The power-frequency voltage signal that zero-sequence current is directly proportional carries out high frequency carrier modulation, forms zero-sequence current high-frequency carrier signal；The height
Frequency carrier signal Jing current transformer is coupled to primary side, adds to power transmission line；The high-frequency carrier signal contains zero-sequence current
Amplitude and phase information, and with circuit, the earth formed loop, reach substation bus bar；By being installed in substation bus bar
Bus signal receiver extracts high-frequency carrier signal, and high-frequency carrier signal is processed, and obtains the width of circuit zero-sequence current
Value and phase information, accurately detect power distribution network zero-sequence current.The high-frequency carrier signal voltage for adding to power transmission line be 1V within,
Frequency is in tens more than kHZ, and the impact to electrical network is little, and power distribution network zero-sequence current remote transmission can be realized with detection.
The beneficial effects of the utility model are：Power distribution network zero-sequence current remote transmission and detection, implementation letter can be realized
Single, cost is relatively low.By accurate, reliable power distribution network zero-sequence current detection, for fault location foundation is provided.
Description of the drawings
Fig. 1 is this utility model one embodiment zero-sequence current carrier signal generating meanss structural representation；
Fig. 2 is this utility model one embodiment zero-sequence current carrier signal source topology diagram；
Fig. 3 is the pwm control signal schematic diagram of this utility model one embodiment electronic power switch；
Fig. 4 is this utility model one embodiment residual voltage index of modulation S (t) schematic diagram；
Fig. 5 is the original residual voltage signal U of this utility model one embodiment0(t) schematic diagram；
Fig. 6 is the residual voltage signal U after the modulation of this utility model one embodiment electronic power switch0' (t)=S (t)
U0(t) schematic diagram；
Fig. 7 is the high frequency residual voltage signal U that this utility model one embodiment is injected in circuits(t) schematic diagram.
Specific embodiment
Embodiment of the present utility model is described in detail below in conjunction with the accompanying drawings.
The example of the embodiment is shown in the drawings, wherein from start to finish same or similar label represents identical or class
As element or the element with same or like function.Below with reference to Description of Drawings embodiment be it is exemplary, only
For explaining this utility model, and can not be construed to restriction of the present utility model.
Following disclosure provides many different embodiments or example is used for realizing different structure of the present utility model.For
Simplification disclosure of the present utility model, is hereinafter described to the part and setting of specific examples.They are only merely illustrative, and
And purpose does not lie in restriction this utility model.Additionally, this utility model can in different examples repeat reference numerals and/or word
It is female.This repetition is for purposes of simplicity and clarity, between itself not indicating discussed various embodiments and/or arranging
Relation.Additionally, this utility model provides the example of various specific techniques and material, but those of ordinary skill in the art can
To recognize the applicability of other techniques and/or the use of other materials.In addition, fisrt feature described below is special second
Levy it " on " structure can include that the first and second features be formed as the embodiment of directly contact, it is also possible to including other spy
The embodiment being formed between the first and second features is levied, such first and second feature may not be directly contact.
In description of the present utility model, it should be noted that unless otherwise prescribed and limit, term " connected " " connection " answer
It is interpreted broadly, can is direct for example, it may be being mechanically connected or electrical connection, or the connection of two element internals
It is connected, it is also possible to be indirectly connected to by intermediary, for the those of ordinary skill in phase field, can be as the case may be
Understand the concrete meaning of above-mentioned term.
This utility model embodiment is adopted the following technical scheme that：A kind of zero-sequence current carrier signal generating meanss, including matching somebody with somebody
Electrical network and substation bus bar, also including zero-sequence current carrier signal source and bus signal receiver；The zero-sequence current carrier wave letter
Number source is arranged at power distribution network outlet node, for the zero sequence current signal extracted at the node to be converted into into high frequency carrier letter
Number；The zero-sequence current carrier signal source forms loop with power distribution network, trouble point, the earth, substation bus bar；Installed in transformer station
Bus signal receiver at bus obtains the amplitude and phase information of zero-sequence current by extracting the high-frequency carrier signal.
Further, the zero-sequence current carrier signal source includes accessing the current transformer of the distribution network line, in parallel
In the resistance at the current transformer two ends, and the bidirectional power electronic switch for being connected in parallel on resistance two ends；By high frequency square wave
Signal controls the break-make of the bidirectional power electronic switch.
Further, the bus signal receiver includes a resistance and three electric capacity, and three electric capacity accesses power transformation
Bus of standing is connected again with a resistance, and the resistance eutral grounding.
Further, the high-frequency square-wave signal frequency range is in tens kHz to hundreds of kHz.
Embodiment 1
The present embodiment proposes a kind of zero-sequence current carrier signal generating meanss, and its structure is as shown in figure 1, its core exists
In the generation of zero-sequence current carrier signal source carrier wave, illustrate that its carrier wave produces principle in conjunction with Fig. 2.
In Fig. 1 by taking one group of outlet of 10kV/35kV buses as an example, zero-sequence current is installed at certain node of power distribution network outlet
Carrier signal source, after it there is singlephase earth fault in power distribution network, the zero sequence that zero-sequence current carrier signal source will be extracted at the node
Current signal is converted into high-frequency carrier signal, and these high-frequency carrier signals contain the amplitude and phase information of zero-sequence current, frequency
Band scope is less than 1V in tens of kHZ～hundreds of kHZ, magnitude of voltage.
From figure 1 it appears that zero-sequence current carrier signal source can form loop with circuit, trouble point, the earth, bus,
By the extractable high-frequency carrier signal of the bus signal receiver installed on substation bus bar, so as to zero-sequence current can be obtained
Amplitude and phase information.
Wherein, the structure of bus signal receiver is as shown in Fig. 1 dotted line frames.Its basic structure is a resistance and three
Electric capacity C, because capacitor plays the role of separated by direct communication, for high-frequency carrier signal, ohmically voltage is in close proximity to high frequency
Voltage signal.For power frequency component, ohmically voltage is almost 0.Fundamental current signal can be filtered off by said method, carried
Take out high frequency electric carrier signal.
It is the topology diagram of zero-sequence current carrier signal source shown in Fig. 2, each parameter declaration is as follows in figure：
CT-A, CT-B, CT-C represent respectively the current transformer for accessing power distribution network A, B, C three-phase line；
I0Represent the zero-sequence current extracted by current transformer；
R represents the small resistor for being connected in parallel on current transformer two ends；
U0Represent the voltage at R two ends, i.e., the residual voltage signal for extracting by small resistor；
PWM is represented to the high frequency square wave modulated signal of bidirectional power electronic switch input, and the high-frequency square-wave signal frequency exists
In the range of tens kHz to hundreds of kHz.
UsThe carrier voltage signal on circuit is coupled in expression by current transformer.
The principle of zero-sequence current carrier signal source is illustrated with reference to Fig. 2：When PWM high-frequency square-wave signals are high level
When, bidirectional power electronic switch is in voltage U0Positive and negative half cycle is turned in turn, and equivalent to being shorted, both end voltage is 0 to small resistor R；
When PWM high-frequency square-wave signals are low level, bidirectional power electronic switch is turned off, and the branch road is equivalent to open circuit, zero sequence circuit
I0Flow through through small resistor R, both end voltage is R I0。
Assume non-parallel power electronic switching circuitry, the residual voltage signal at small resistor R two ends is U0T (), then have
U0(t)=R I0 (1)
Residual voltage index of modulation function is defined as S (t), order
After parallel power electronic switch, the residual voltage signal at small resistor R two ends is U0' (t), according to (1) formula, (2) formula
Then have；
U0' (t)=S (t) U0(t) (3)
By Current Transformer Secondary side by carrier voltage U0' primary side (t) is coupled to, can in the line inject a number
The high-frequency carrier signal that ten kHz are directly proportional in hundreds of kHz frequency band ranges to zero-sequence current, magnitude of voltage is less than 1V.With reference to bus
On bus signal receiver to the extraction of fm carrier signal, analysis, can accurately detect zero-sequence current information.
Embodiment 2
Principle is produced with reference to Fig. 2 explanation zero-sequence current carrier signal source carrier waves.
The single-phase fault earth current of power distribution network is usually no more than 100A, it is assumed that zero-sequence current is 100A, and selection no-load voltage ratio is
100:5 current transformer, then the zero-sequence current I of secondary side0=5A, small resistor R takes 1.6 Ω, then have U0=RI0=8V, coupling
To the voltage U of primary sides=U0/ 20=0.4V, therefore the voltage very little of distribution network system is injected into by current transformer, it is right
Electrical network does not affect.
It should be noted that in Fig. 1, the pwm control signal of the electronic power switch of zero-sequence current carrier signal source is high
Frequency signal, its frequency band range is in tens of kHZ to hundreds of kHZ.To make diagram relatively sharp, a power frequency in embodiment 2 is illustrated
8 square-wave signals are only depicted in the range of cycle (0.02s), this is far longer than in practice.
Simplified PWM square-wave signals are as shown in Figure 3.Residual voltage index of modulation S (t) function such as Fig. 4 can be obtained according to (2) formula
It is shown.When i.e. pwm signal is high level, S (t) is 0；When pwm signal is low level, S (t) is 1.
During non-parallel power electronic switching circuitry, the residual voltage signal at small resistor R two ends is U0(t), due to U0(t)=R
I0, zero-sequence current I0It is power frequency component, R is fixed resistance, therefore U0T the oscillogram of () is as shown in Figure 5.
Due to U0' (t)=S (t) U0(t), the residual voltage carrier wave after the modulation of electronic power switch loop pwm signal
The oscillogram of signal is as shown in Figure 6.
U0' (t) be coupled back in circuit through Current Transformer Secondary side, the waveform of the zero-sequence current carrier signal source of formation
Scheme as shown in Figure 7, UsT () is a high-frequency carrier signal with sinusoidal signal as envelope.
Zero-sequence current carrier signal source UsT () forms loop with circuit, trouble point, the earth, bus, by female in transformer station
Line signal receiver is extracted and includes zero-sequence current amplitude, the high-frequency carrier signal of phase information, can accurately detect power distribution network
Zero-sequence current.
It should be appreciated that the part that this specification is not elaborated belongs to prior art.
Although the specific embodiment of the present utility model above in association with Description of Drawings, those of ordinary skill in the art
It should be appreciated that these are merely illustrative of, various deformation or modification can be made to these embodiments, without departing from this practicality
New principle and essence.Scope of the present utility model is only limited by the claims that follow.
Claims (4)
1. a kind of zero-sequence current carrier signal generating meanss, including power distribution network and substation bus bar, is characterized in that, also including zero sequence
Current carrier signal source and bus signal receiver；The zero-sequence current carrier signal source is arranged at power distribution network outlet node,
For the zero sequence current signal extracted at the node to be converted into into high-frequency carrier signal；The zero-sequence current carrier signal source with match somebody with somebody
Electrical network, trouble point, the earth, substation bus bar form loop;Bus signal receiver at substation bus bar is by carrying
The high-frequency carrier signal is taken, the amplitude and phase information of zero-sequence current is obtained.
2. zero-sequence current carrier signal generating meanss as claimed in claim 1, is characterized in that, the zero-sequence current carrier signal
Source includes accessing the current transformer of the distribution network line, is connected in parallel on the resistance at the current transformer two ends, and in parallel
In the bidirectional power electronic switch at resistance two ends；The break-make of the bidirectional power electronic switch is controlled by high-frequency square-wave signal.
3. zero-sequence current carrier signal generating meanss as claimed in claim 1, is characterized in that, the bus signal receiver bag
A resistance and three electric capacity are included, three electric capacity accesses substation bus bar and is connected with a resistance again, and the resistance connects
Ground.
4. zero-sequence current carrier signal generating meanss as claimed in claim 2, is characterized in that, the high-frequency square-wave signal frequency
Scope is in tens kHz to hundreds of kHz.
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| CN201621080448.XU CN206132832U (en) | 2016-09-26 | 2016-09-26 | Zero sequence current carrier signal generating device |
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| CN201621080448.XU CN206132832U (en) | 2016-09-26 | 2016-09-26 | Zero sequence current carrier signal generating device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106370914A (en) * | 2016-09-26 | 2017-02-01 | 武汉科技大学 | Zero sequence current carrier signal generating device and signal transmission method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106370914A (en) * | 2016-09-26 | 2017-02-01 | 武汉科技大学 | Zero sequence current carrier signal generating device and signal transmission method |
| CN106370914B (en) * | 2016-09-26 | 2023-04-18 | 武汉科技大学 | Zero-sequence current carrier signal generating device and signal transmission method |
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