CN207882327U - A kind of network voltage full frequency-domain monitoring device based on wideband wide range CT - Google Patents

A kind of network voltage full frequency-domain monitoring device based on wideband wide range CT Download PDF

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Publication number
CN207882327U
CN207882327U CN201721455243.XU CN201721455243U CN207882327U CN 207882327 U CN207882327 U CN 207882327U CN 201721455243 U CN201721455243 U CN 201721455243U CN 207882327 U CN207882327 U CN 207882327U
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wide range
voltage
monitoring
signal
frequency
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郑宏
周志松
杨虎
叶琚英
鲍美军
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Hangzhou Colin Electric Ltd By Share Ltd
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Hangzhou Colin Electric Ltd By Share Ltd
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Abstract

The utility model discloses a kind of network voltage full frequency-domain monitoring devices based on wideband wide range CT, in the end shield ground connection secondary circuit of device inversed current transformer in high-voltage fence, one wideband wide range CT is installed, measure full frequency-domain electric current of the power grid in 50Hz~1MHz wide-bands, measured electric quantity signal carries out analyzing processing in DSP broadband signal monitoring devices, phase time and voltage magnitude that power network overvoltage is happened at opposite fundamental frequency can be accurately monitored, realizes full frequency-domain monitoring of the network voltage from power frequency to high frequency.The utility model no longer needs the measurement in a closed series of divider or multiple CT, measured secondary singal divides multiband to derive without software, direct signal acquisition can restore grid voltage waveform, achieve the effect that not only to monitor network voltage but also high voltage equipment insulation state can be analyzed simultaneously, technical support can be provided for the repair based on condition of component of network voltage and electric energy quality monitoring, power equipment.

Description

A kind of network voltage full frequency-domain monitoring device based on wideband wide range CT
Technical field
The utility model is related to the voltage monitoring technical fields of high-voltage fence, more particularly to one kind being based on wideband wide range CT Network voltage full frequency-domain monitoring device.
Background technology
There are a large amount of reactor, capacitor and power cable in high-voltage fence, these equipment have perception or capacitive storage Can characteristic, easily there is phenomena such as shutting off, electric arc resume combustion in when induction equipment switching, and capacitive apparatus switching, which is also easy to produce, to shove and restriked Voltage.These equipment generate the switching overvoltage of tens KHz of frequency in switching, and power grid may also suffer frequency and be up to 1MHz sometimes Lightning Over-voltage.These overvoltage are added on power grid busbar power-frequency voltage, and power grid busbar voltage amplitude can be caused to be mutated, drawn Play the failures such as high voltage equipment insulation breakdown, shelf depreciation even damage.The frequency of overvoltage concentrates on tens KHz~1MHz high frequencies The region and duration is short, previous conventional voltage and current measurement mode are difficult to monitor the change of network voltage from low to high Change process.It is therefore desirable to slave 50Hz~1MHz voltages to power grid to be monitored, and be controlled with overvoltage for the fault diagnosis of equipment The technical support of offer science is provided.
There are mainly three types of the monitoring technical ways for crossing high-voltage fence voltage at present:First, being installed using voltage divider Small signal is divided out under to high voltage bus to measure;Second is that being directly grounded in the end shield of the capacitive apparatus such as buckling, casing Circuit in series installation inspection leakage resistance, principle are equivalent to partial pressure detection mode;Third, using from power frequency to the more of high frequency difference range A CT combinations are installed to capacitive apparatus end shield earth-return circuit, and power frequency CT is responsible for measuring mA grades of leakage currents, and high frequency CT is responsible for measurement Electrical surge dash current when overvoltage.
Above method cannot fully achieve reliable network voltage full frequency-domain monitoring.Divider is commonly used in high-potting HV voltage signal was obtained, it is general that electricity is measured using the standard capacitor divider parallel running of precision high frequency bandwidth.But it uses The monitoring mode of divider is only parallel in grid power blackout under busbar temporarily, and divider is not hanging net operation equipment, in addition electricity Pressure divider is lossy to generate heat, the problems such as safety difference needs impedance matching, so being only suitable for live interim trial discomfort Close field monitoring.Above measurement in a closed series mode needs capacitive pick-up, High Frequency Current Sensor, power frequency or low-frequency current sensing Multiple segmented sensors components such as device, and the complicated circuits such as integrating circuit, amplifying circuit, signal condition need to be coordinated to realize power frequency With the reconstruct of overvoltage surge waveform, system complex is of high cost, and can be monitored because of non-full frequency band wide range current signal, easily leads to Calculate derive information of voltage distortion, can not accurately calculate overvoltage generation phase be superimposed amplitude.
Invention content
For overcome the deficiencies in the prior art, the purpose of this utility model is to provide one kind being based on wideband wide range CT Network voltage full frequency-domain monitoring device, it is intended to solve the prior art divider or multiple CT needed to combine that wide frequency domain could be covered The problem of machine with wide range signal monitoring.
The purpose of this utility model is realized using following technical scheme:
A kind of network voltage full frequency-domain monitoring device based on wideband wide range CT, including high voltage bus, inversed current Mutual inductor, wideband wide range CT and DSP broadband signal monitoring device;Wherein,
Inversed current transformer is installed in parallel under high voltage bus, inversed current transformer and wideband wide range CT Connection, wideband wide range CT are connected with DSP broadband signal monitoring devices;
High voltage bus is used for transmission network voltage;
Inversed current transformer is used to provide the end shield ground connection secondary loop current in a linear relationship with busbar voltage;
Wideband wide range CT is used to measure the end shield ground connection secondary loop current of inversed current transformer, and will measure Electric quantity signal be sent to DSP broadband signal monitoring devices;
DSP broadband signal monitoring devices obtain DSP data informations for acquiring and handling electric quantity signal, and according to DSP numbers It is believed that breath calculates network voltage.
On the basis of the above embodiments, further, the centre of the wideband wide range CT is provided with tested conducting wire and wears Heart hole, the wide frequency domain electric current of CT 1mA~100A within the scope of non-contact measurement 50Hz~1MHz in a manner of a punching, CT Secondary side export electric quantity signal.
On the basis of above-mentioned any embodiment, further, the DSP broadband signals monitoring device includes electric quantity signal Synchronous acquisition modulate circuit, ADC signal sampler and DSP core device.
On the basis of the above embodiments, further, the ADC signal sampler is believed for multichannel 100M high-speed ADCs Number sampler.
Alternatively, further, the DSP core device is BF707DSP core devices.
On the basis of above-mentioned any embodiment, further, the DSP broadband signals monitoring device is additionally operable to basis DSP data informations calculate the state of insulation parameter of inversed current transformer.
Compared with prior art, the beneficial effects of the utility model are:
The utility model discloses a kind of network voltage full frequency-domain monitoring device based on wideband wide range CT, which exists In high-voltage fence in the end shield ground connection secondary circuit of inversed current transformer, a wideband wide range CT is installed, measurement exists Full frequency-domain electric current in 50Hz~1MHz wide-bands, measured electric quantity signal carry out in DSP broadband signal monitoring devices Analyzing processing can accurately monitor phase time and voltage magnitude that power network overvoltage is happened at opposite fundamental frequency, realize electricity Full frequency-domain monitoring of the net voltage from power frequency to high frequency.The utility model with combined sublevel using multiple and different range CT in the past Ladder type measures dash current and derives that the technology of overvoltage is different, it is no longer necessary to the combination of divider or multiple CT, only with One CT measures the earth current signal of high-tension apparatus, realizes from low frequency 50Hz to high frequency 1MHz 1* in continuous full range segment limit 105The line acquisition of the multiplying power magnitude of current, measured secondary singal divide multiband to derive without software, and direct signal acquires just Grid voltage waveform can be restored, achieve the effect that not only to monitor network voltage but also high voltage equipment insulation state can be analyzed simultaneously, it can be with Repair based on condition of component for network voltage and electric energy quality monitoring, power equipment provides technical support, solves and needed divider in the past Or multiple CT combinations could cover the technical barrier of wide frequency domain machine with wide range signal monitoring.
Description of the drawings
The utility model is further illustrated with reference to the accompanying drawings and examples.
Fig. 1 shows the inversed current transformer principle signal under the network voltage U that the utility model embodiment provides Figure;
Fig. 2 shows a kind of network voltage full frequency-domain prisons based on wideband wide range CT that the utility model embodiment provides Survey the structural schematic diagram of device;
Fig. 3 shows a kind of network voltage full frequency-domain prison based on wideband wide range CT that the utility model embodiment provides Survey the structural schematic diagram of device;
Fig. 4 shows and is folded on the power frequency waveform that measures of wideband wide range CT secondary singals that the utility model embodiment provides Add the waveform diagram of instantaneous overvoltage surge waveform;
Fig. 5 shows under the 8/20uS Impulse Voltages that the utility model embodiment provides that the monitoring of DSP broadband signals fills Set the secondary waveform comparison diagram of the power grid primary voltage and CT that measure.
Specific implementation mode
In the following, in conjunction with attached drawing and specific implementation mode, the utility model is described further, it should be noted that Under the premise of not colliding, it can be formed in any combination between various embodiments described below or between each technical characteristic new Embodiment.
Current transformer in high-voltage fence is common electrical primary equipment in electric system, and main function is by high electricity Pressure, high current are converted into low-voltage, low current, and signal source is provided for electrical energy measurement and relay protection.By current transformer structure Formal classification mainly has two class of vertical current transformer and inversed current transformer, with the continuous improvement of voltage class, Inversed current transformer is used widely.The insulation of inversed current transformer is made of main capacitance screen and end shield, is used Coaxial configuration has the characteristics that do not distort tested waveform and intrinsic standoff ratio stabilization, and surge voltage frequency response characteristic is good, and range can Up to 2MHz.Therefore busbar voltage can be obtained by measuring secondary earth current semaphore in the end shield based on inversed current transformer Full frequency-domain voltage value in 50Hz~2MHz band limits.
Inversed current transformer principle under network voltage U as shown in Figure 1, R, C are main screen substitutional resistance and capacitance, R2, C2 are end shield substitutional resistance and capacitance.
Current transformer primary side bear voltage be U when, flow through the electric current i of end shield ground terminal:
I=iR+jic (1)
In formula:The capacitive component i of electric current ic=ω cu, the unit vector that j is 90 degree;
The resistive component i of electric current iR=iCTan δ, tan δ are the dielectric loss value of mutual inductor;
The virtual value I of electric current i is obtained after processing formula (1):
Therefore, current vs voltage carry-over factor
By formula (3) it is found that there are letters between flowing through the current value and primary voltage value of current transformer end shield ground terminal Number relationships, for the voltage of a certain specific frequency, carry-over factor only with the capacitance C and dielectric loss value of current transformer Tan δ are related.
If the current transformer that certain dielectric loss value is tan δ, capacitance change into final shape by the C1 of original state The C2 of state, it is Kc2 that corresponding carry-over factor, which also has Kc1 variations,.
It is Kc to define the relative deviation that electric capacitance change causes carry-over factor to change:
Kc=(Kc1-Kc2)/Kc1 (6)
(4), (5) are substituted into (6) and obtained:
Kc=(C1-C2)/C1=1-C2/C1 (7)
It can be seen that carry-over factor is in a linear relationship with rate of change of capacitance.
If certain capacitance is the current transformer of C, dielectric loss value by original state tan δ1Change into final shape The tan δ of state2, corresponding carry-over factor also has Ktan δ1Variation is Ktan δ2
It is Ktan δ to define the relative deviation that dielectric loss value variation causes carry-over factor to change:
Ktan δ=(K tan δ1-K tanδ2)/K tanδ1 (10)
(8), (9) are substituted into (10) and obtained:
Because of tan δ1< < 1, tan δ2< < 1, can formula (11) it is found that influence of the dielectric loss value variation to carry-over factor is non- It is often small.
As shown in Figures 2 and 3, it is complete to provide a kind of network voltage based on wideband wide range CT for the utility model embodiment Frequency domain monitoring device, including high voltage bus, inversed current transformer, wideband wide range CT and DSP broadband signal monitoring device; Wherein, inversed current transformer is installed in parallel under high voltage bus, and inversed current transformer is connected with wideband wide range CT, Wideband wide range CT is connected with DSP broadband signal monitoring devices;High voltage bus is used for transmission network voltage;Inversed current mutual inductance Device is used to provide the end shield ground connection secondary loop current in a linear relationship with busbar voltage;Wideband wide range CT is inverted for measuring The end shield of formula current transformer is grounded secondary loop current, and the electric quantity signal measured is sent to the monitoring of DSP broadband signals Device;DSP broadband signal monitoring devices obtain DSP data informations for acquiring and handling electric quantity signal, and according to DSP data Information calculates network voltage.
Preferably, the DSP broadband signals monitoring device, can also be according to DSP other than it can monitor network voltage Data information calculates the state of insulation parameter of inversed current transformer.
The utility model embodiment does not limit the type of wideband wide range CT, it is preferred that the wideband wide range CT Centre be provided with tested conducting wire center hole, CT 1mA within the scope of non-contact measurement 50Hz~1MHz in a manner of a punching The secondary side of the wide frequency domain electric current of~100A, CT exports electric quantity signal.The advantage of doing so is that the CT installed additional does not influence end shield High current through-current capability, be suitable for the larger measurement occasion of electric current.Punching non-contact measurement high-tension apparatus end shield Earth current full frequency-domain semaphore coordinates DSP broadband signal monitoring devices, you can realizes from the small semaphore of low frequency to high frequency and rushes It hits the full frequency-domain acquisition of the big semaphore of transient state and calculates analysis.
The utility model embodiment can be verified the performance of device by high-potting, and standard capacitance is installed in parallel To under high voltage bus, busbar voltage waveform can be restored by the secondary singal of standard capacitance, nominal situation network voltage is 50Hz The secondary output signal of power frequency sine wave, CT is power frequency sine wave signal.In power-frequency voltage and high-frequency operation Impulse Voltage Under, inversed current transformer transmission characteristic high-potting verification system diagram is shown in Fig. 2 and Fig. 3.High voltage bus runs power frequency 50Hz voltages, impulse voltage generator are added to power frequency waveform arbitrary phase for generating high-frequency operation surge voltage, pass through Capacitive divider directly measures operating impulse voltage, and surge voltage is applied to a guide rod of inversed current transformer On, aluminum pipe and end shield terminals, the secondary connection and pedestal of mutual inductor are grounded, and are shown by High Frequency Current Sensor and number Electric current on wave device detection ground wire.
Instantaneous overvoltage surge waveform is superimposed on the power frequency waveform that wideband wide range CT secondary singals measure as shown in Fig. 4. And when overvoltage surge impact occurs for power grid, the signal that CT mutual inductor measurings obtain is to be superimposed on the basis of power frequency waveform accordingly Surge impact waveform, and the surge waveform that secondary singal measures is happened at power frequency sine wave to power frequency wave phase and an overvoltage On phase it is identical, as shown in figure 5, under 8/20uS Impulse Voltages, the power grid that DSP broadband signal monitoring devices measure is primary Almost phase coincidence, difference are small for the secondary waveform of voltage and CT.It can be seen that in inversed current transformer 2M frequency ranges Interior, under different amplitude voltage effects, the inversed current transformer electric current I monitored by wideband wide range CT is to busbar voltage The carry-over factor linearity of U is preferable, difference is smaller, therefore can meet power grid electricity from inversed current transformer end shield current monitoring Press engineering survey requirement.
In the end shield ground connection secondary circuit of the utility model embodiment inversed current transformer in high-voltage fence, installation One wideband wide range CT, can measure the full frequency-domain electric current in 50Hz~1MHz wide-bands, measured electric quantity signal Analyzing processing is carried out in DSP broadband signal monitoring devices, power network overvoltage can be accurately monitored and be happened at opposite fundamental frequency Phase time and voltage magnitude, realize network voltage from power frequency to high frequency full frequency-domain monitoring.The utility model embodiment with It measured dash current using multiple and different range CT sublevel ladder types that combine in the past and derives that the technology of overvoltage is different, no longer The combination for needing divider or multiple CT measures the earth current of high-tension apparatus only with a CT, and measured is secondary Signal without software multiband derive, direct signal acquisition can restore grid voltage waveform, reach not only monitor network voltage but also The effect of high voltage equipment insulation state can be analyzed simultaneously, can be the state of network voltage and electric energy quality monitoring, power equipment Maintenance provides technical support, solves and needs divider or multiple CT combinations that could cover wide frequency domain machine with wide range signal in the past The technical barrier of monitoring.
Electric quantity signal in the utility model embodiment can be current signal, can also be voltage signal.Preferably, It can be current signal, and most Current Transmit outputs are all current signals.
The utility model embodiment does not limit DSP broadband signals monitoring device, it is preferred that it can select to use ADIBF7 series DSP signal processors.The DSP broadband signals monitoring device may include electric quantity signal synchronous acquisition conditioning electricity Road, ADC signal sampler and DSP core device.CT secondary singals are output to electric quantity signal synchronous acquisition modulate circuit, electricity Signal synchronous collection modulate circuit and ADC signal sampler are used to believe electricity for acquiring electric quantity signal, DSP core device It number is digitized processing and obtains DSP data informations.The utility model embodiment does not limit ADC signal sampler, Preferably, the ADC signal sampler can be multichannel 100M high-speed ADC signal acquisition devices.The utility model embodiment DSP core device is not limited, it is preferred that the DSP core device can be BF707DSP core devices.
It will be apparent to those skilled in the art that technical solution that can be as described above and design, make various other Corresponding change and deformation, and all these changes and deformation should all belong to the protection of the utility model claims Within the scope of.

Claims (6)

1. a kind of network voltage full frequency-domain monitoring device based on wideband wide range CT, which is characterized in that including high voltage bus, fall Set formula current transformer, wideband wide range CT and DSP broadband signal monitoring device;Wherein,
Inversed current transformer is installed in parallel under high voltage bus, and inversed current transformer is connected with wideband wide range CT, Wideband wide range CT is connected with DSP broadband signal monitoring devices;
High voltage bus is used for transmission network voltage;
Inversed current transformer is used to provide the end shield ground connection secondary loop current in a linear relationship with busbar voltage;
Wideband wide range CT is used to measure the end shield ground connection secondary loop current of inversed current transformer, and the electricity that will be measured Amount signal is sent to DSP broadband signal monitoring devices;
DSP broadband signal monitoring devices obtain DSP data informations for acquiring and handling electric quantity signal, and are believed according to DSP data Breath calculates network voltage.
2. the network voltage full frequency-domain monitoring device according to claim 1 based on wideband wide range CT, which is characterized in that The centre of the wideband wide range CT is provided with tested conducting wire center hole, CT non-contact measurement 50Hz in a manner of a punching The secondary side of the wide frequency domain electric current of 1mA~100A within the scope of~1MHz, CT exports electric quantity signal.
3. the network voltage full frequency-domain monitoring device according to claim 1 or 2 based on wideband wide range CT, feature exist In the DSP broadband signals monitoring device includes electric quantity signal synchronous acquisition modulate circuit, ADC signal sampler and DSP core Heart device.
4. the network voltage full frequency-domain monitoring device according to claim 3 based on wideband wide range CT, which is characterized in that The ADC signal sampler is multichannel 100M high-speed ADC signal acquisition devices.
5. the network voltage full frequency-domain monitoring device according to claim 3 based on wideband wide range CT, which is characterized in that The DSP core device is BF707DSP core devices.
6. the network voltage full frequency-domain monitoring device according to claim 1 or 2 based on wideband wide range CT, feature exist In the DSP broadband signals monitoring device is additionally operable to calculate the state of insulation of inversed current transformer according to DSP data informations Parameter.
CN201721455243.XU 2017-11-03 2017-11-03 A kind of network voltage full frequency-domain monitoring device based on wideband wide range CT Active CN207882327U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110376541A (en) * 2019-08-23 2019-10-25 国网内蒙古东部电力有限公司电力科学研究院 A method of test electronic mutual inductor wideband transmission characteristic

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110376541A (en) * 2019-08-23 2019-10-25 国网内蒙古东部电力有限公司电力科学研究院 A method of test electronic mutual inductor wideband transmission characteristic

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Inventor after: Zheng Hong

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Inventor after: Ye Yaoying

Inventor after: Bao Meijun

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Patentee after: Hangzhou Colin electric Limited by Share Ltd

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