CN205120856U - Power quality monitor device of transformer substation - Google Patents
Power quality monitor device of transformer substation Download PDFInfo
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- CN205120856U CN205120856U CN201520803964.XU CN201520803964U CN205120856U CN 205120856 U CN205120856 U CN 205120856U CN 201520803964 U CN201520803964 U CN 201520803964U CN 205120856 U CN205120856 U CN 205120856U
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Abstract
The utility model relates to a power quality monitor device of transformer substation, include: voltage and current sensor, amplifier circuit, phase -locked loop synchronous sampling circuit, anti -aliasing filter ware, multichannel AD converting circuit and DSP chip, voltage and current sensor loop through amplifier circuit, phase -locked loop synchronous sampling circuit, anti -aliasing filter ware, multichannel AD converting circuit and DSP chip and link to each other. The utility model discloses can real -time supervision and the electrical parameter of analysis electric wire netting, make accurate detection and analysis to the electric energy quality, be favorable to the analysis and judge the reason that causes various electric energy quality problems, provide the basis for the improvement of electric energy quality, the electric energy quality integration testing in all return circuits of transformer substation can once only carry out for the investment cost of transformer substation reduces by a wide margin and maintains that the use is more convenient.
Description
Technical field
The utility model relates to technical field of power systems, particularly relates to a kind of electric energy quality for substation monitoring device.
Background technology
Along with modernization industry, military service, communication, computing center, finance, business and the requirement of other all trades and professions to power supply reliability and the quality of power supply are more and more higher, how to improve and to ensure comprehensive quality of power supply, having become one of electric system important topic in the urgent need to address.
Along with the experimental study with UHV transmission technology of building up of UHV (ultra-high voltage) backbone network, safeguard that the safety of electrical network, reliability service are vital tasks always.Important electric process comprises the voltage swell (falling) that short trouble causes, and the pulse that Insulation Problems causes, shoves, and the responsibility judgment etc. that harmonic source problem causes, is only had and just can be reflected by dynamic power quality parameter.
But the defects such as monitoring channel is single, use cost is high, Monitoring Data is not accurate that relevant power quality monitoring device in the market exists, cannot meet requirement that is convenient, effective, high performance-price ratio.
Utility model content
Based on this, be necessary for the problems referred to above, a kind of electric energy quality for substation monitoring device is provided, the quality of power supply integrated test in all loops of disposable transformer station accurately can be realized.
In order to achieve the above object, the technical solution adopted in the utility model is as follows:
A kind of electric energy quality for substation monitoring device, comprising: voltage and current sensor, amplifying circuit, PLL synchronous sampling circuit circuit, frequency overlapped-resistable filter, hyperchannel A/D change-over circuit and dsp chip; Voltage and current sensor is connected with dsp chip by amplifying circuit, PLL synchronous sampling circuit circuit, frequency overlapped-resistable filter, hyperchannel A/D change-over circuit successively.
The utility model electric energy quality for substation monitoring device, when mutually comparing with prior art, possesses following advantage:
1, adopt PLL synchronous sampling circuit circuit to carry out synchronized sampling, realize the Measurement accuracy of signal; Adopt frequency overlapped-resistable filter, eliminate the higher hamonic wave that various electromagnetic interference (EMI) produces, unaffected to ensure the harmonic wave within 50 times, guarantee measuring accuracy.The utility model can Real-Time Monitoring analyze the electrical quantity of electrical network, makes accurate determination and analysis, be conducive to the reason analyzing and judge to cause various power quality problem, for the improvement of the quality of power supply provides foundation to the quality of power supply.
2, adopt hyperchannel A/D change-over circuit, ensure the high-speed, high precision continuous sampling simultaneously of multichannel signal.Monitoring channel reaches 75, need multiple stage equipment for monitoring power quality is installed compared to an electrical substation monitoring of the prior art, the equipment for monitoring power quality that the utility model provides disposablely can carry out the quality of power supply integrated test in an all loop of transformer station, the cost of investment of transformer station is significantly reduced and safeguards that use is more convenient.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model electric energy quality for substation monitoring device embodiment;
Fig. 2 is the circuit diagram of AD8221 specific embodiment;
Fig. 3 is the circuit diagram of CD4046 specific embodiment;
Fig. 4 is the circuit diagram of MAX275 specific embodiment;
Fig. 5 is the structural representation of the utility model principal and subordinate card cascade.
Embodiment
In order to better understand the technical problems to be solved in the utility model, the technical scheme taked and the technique effect reached, below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail.
As shown in Figure 1, a kind of electric energy quality for substation monitoring device, comprise: voltage and current sensor 100, amplifying circuit 200, PLL synchronous sampling circuit circuit 300, frequency overlapped-resistable filter 400, hyperchannel A/D (modulus) change-over circuit 500 and DSP (digitalsignalprocessing, digital signal processing) chip 600; Voltage and current sensor 100 is connected with dsp chip 600 by amplifying circuit 200, PLL synchronous sampling circuit circuit 300, frequency overlapped-resistable filter 400, hyperchannel A/D change-over circuit 500 successively.
The voltage magnitude got by voltage and current sensor 100 collection is less, and peak value is about 40mV (millivolt), is not easy to measure, and therefore needs to be amplified the signal gathered by amplifying circuit 200.The common-mode rejection ratio of most of instrumentation amplifier just starts decay at 200Hz (hertz) place in the market, the designing requirement of the utility model monitoring device can not be met, so, in one embodiment, described amplifying circuit 200 can be gain programmable instrumentation amplifier, such as gain programmable high-performance instrumentation amplifier AD8221 etc.Instrumentation amplifier able to programme can provide industrial higher common-mode rejection ratio.Such as, when gain is 1, AD8221 can in the common-mode rejection ratio of minimally 80dB (decibel) at different levels, until frequency reaches 10kHz (KHz), thus it can well suppress broadband interference and linear distortion.Below AD8221 is simply introduced.
As shown in Figure 2, the dual power supply of AD8221 employing ± 12V, and the power end of the tantalum electric capacity of 0.1uF (microfarad) ceramic disc capacitor adopting equivalent series resistance (ESR) minimum and 10uF to input carries out decoupling and filtering, with reference to power input ground connection.The voltage signal values sended over due to front end CT (current sensor), PT (voltage sensor) is again 0mV ~ 40mV, and change the input requirements of 0V ~+5V in conjunction with A/D, so adopt AD8221 to carry out, the multiple of signal amplification is maximum should be 125 times.By the gain formula of AD8221, can show that the value of GR should be greater than 399 ohm, select resistance to be 412 ohm, the high-accuracy resistance of 0.1%.
In addition, AD8221 can not only sample to CT, PT the weak voltage signals got and amplify, and can mate front stage loaded impedance, improve input resistance, the sampling hold circuit of isolation sample circuit and rear class A/D conversion, reduce output resistance, thus shorten ADC module change needed for tracking time.
In mains by harmonics is measured, due to the change of mains frequency, if sample frequency is fixed, then can cause non-integer-period sampled, thus cause spectrum leakage, bring the additive error of measurement.Therefore, the key that synchronized sampling is Measurement accuracy live signal is carried out.Synchronized sampling is exactly undertaken evenly discrete by the one-period of signal or multiple cycle, gets the instantaneous value of its signal at each discrete point place.In power system measuring, except will knowing every road signal value size, also will know the phase relation between the signal of every road, this just requires to adopt synchronous sampling technique to obtain information accurately.
PLL synchronous sampling circuit circuit 300 can adopt existing circuit realiration in prior art.In one embodiment, described PLL synchronous sampling circuit circuit 300 can comprise integrated phase lock chip sum counter.Integrated phase lock chip can select the versatility integrated phase lock chip CD4046 etc. of widespread use, and counter can adopt 12 grades of binary counter (frequency divider) CD4040.Below CD4046 is simply introduced.
CD4046 is the multifunctional single-sheet integrated phase lock be made up of cmos circuit, has the advantages such as low-power consumption, input impedance are high, supply voltage wide ranges, is widely used in signal transacting and digital display circuit.What CD4046 phaselocked loop adopted is RC type voltage controlled oscillator, and necessary external capacitor and resistance are as discharge and recharge element.CD4046 internal cable amplifier and shaping circuit, can become the weak voltage signals of about the 100mv of input into square wave or pulse signal delivers to phase comparator.As shown in Figure 3, selecting VA, VB, VC three-phase as frequency reference amount, is that the out-of-work situation of phaselocked loop occurs in order to prevent when wherein a certain phase or certain two-phase power down.Meanwhile, the frequency division output terminal of CD4046 is provided with frequency multiplication and selects terminal, flexibly according to the needs of actual conditions, can change the sampling number of every cycle like this, realizes every cycle 64 point, the sampling of 128.Light-coupled isolation chip two ends should adopt the insulating power supply of+5V to power, isolating in analog and digitally of two ends.
For preventing aliasing, voltage and current need through frequency overlapped-resistable filter 400, by higher hamonic wave filtering, unaffected to ensure the harmonic wave within 50 times, guarantees measuring accuracy.In one embodiment, described frequency overlapped-resistable filter can be active power filtering chip, such as universal active power filtering chip MAX275 etc.MAX275 includes two independently second-order active power filter circuit, can carry out low pass and bandpass filtering respectively simultaneously, also realize quadravalence active power filtering by cascade, and its center cutoff frequency is adjustable in 100Hz ~ 300kHZ, and degree of accuracy is within ± 0.1%.
As shown in Figure 4, V1, V2 are the input of two paths of signals voltage respectively, and Vo1, Vo2 represent the output of two-way low-pass filtering.MAX275 adopts+5V single ended power supply to power, according to designing requirement, center cutoff frequency Fo value is 3.2kHZ, quality factor Q is 0.7071, the gain Holp of low-pass filter gets 1, and considering the convenience of actual selection resistance, R1, R2, R3, R4 respectively value are 121k Ω, 604k Ω, 86.6k Ω, 590k Ω.In addition, V+ and GND all tackles V-pin and connects the ceramic disc capacitor of 0.1uF and the tantalum electric capacity of 4.7uF, carries out decoupling and bypass.
Hyperchannel A/D change-over circuit 500 can adopt analog to digital conversion circuit of the prior art, such as AD7665 etc.Hyperchannel A/D change-over circuit 500 need ensure the high-speed, high precision continuous sampling simultaneously of multichannel signal.Because acquisition channel can reach 75, therefore, continuous sampling speed and how to realize multichannel clock synchronization issue particularly crucial, otherwise cannot positioning analysis accurately be carried out.In addition, multiple analysis indexes such as flicker source, the harmonic source location etc. of the quality of power supply all require the clock signal synchronization of all monitoring circuits.In one embodiment, as shown in Figure 5, in order to ensure the data acquisition clock synchronous under multi-channel testing, principal and subordinate's card cascade of described hyperchannel A/D change-over circuit 500.
When adopting principal and subordinate's card cascade, main card generally uses internal clock source module, and uses external clock source pattern from card.Until main card, be initialised from card by corresponding clock source pattern after, first start all from card, clock signal is not had because main card is not also activated, so enter waiting status from card, until main card all being activated from card while being activated, namely achieve the function of many cards synchronous averaging.When the sampling channel number needed is greater than the port number of a card, use the mode extended channel quantity of many cards cascade.
Dsp chip 600 adopts existing chip in prior art to realize, such as TMS320VC5509ADSP etc.Dsp chip 600, except the signal that input hyperchannel A/D change-over circuit exports, also inputs the pulse signal of the GPS after Phototube Coupling and triggers the switching value of record ripple.In one embodiment, the utility model device can comprise the industrial computer be connected with described dsp chip 600.The digital signal of dsp chip 600 to input carries out power quality analysis (comprising frequency, frequency spectrum, tri-phase unbalance factor, voltage deviation, flickering, variation in voltage) and Correlation method for data processing (when switching value triggers record ripple and accurate pair), then send industrial computer by test result by PCI (Peripheral Component Interconnect standard) bus.In addition, when the quality of power supply exceeds standard, dsp chip 600 exports the switching value that exceeds standard.
In one embodiment, the utility model device can also comprise the host computer be connected with described industrial computer.Industrial computer sends data to host computer by Ethernet or radio communication.Host computer through processing various testing journal sheets, the in real time form, statistical report form, trend map, oscillogram, spectrogram etc. that can obtain needed for user, and can show, printing, preserving data, and carries out data sharing and data conversion etc.
Each technical characteristic of the above embodiment can combine arbitrarily, for making description succinct, the all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics does not exist contradiction, be all considered to be the scope that this instructions is recorded.
The above embodiment only have expressed several embodiment of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to utility model patent scope.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be as the criterion with claims.
Claims (7)
1. an electric energy quality for substation monitoring device, is characterized in that, comprising: voltage and current sensor, amplifying circuit, PLL synchronous sampling circuit circuit, frequency overlapped-resistable filter, hyperchannel A/D change-over circuit and dsp chip; Voltage and current sensor is connected with dsp chip by amplifying circuit, PLL synchronous sampling circuit circuit, frequency overlapped-resistable filter, hyperchannel A/D change-over circuit successively.
2. electric energy quality for substation monitoring device according to claim 1, is characterized in that, described amplifying circuit is gain programmable instrumentation amplifier.
3. electric energy quality for substation monitoring device according to claim 1, is characterized in that, described PLL synchronous sampling circuit circuit comprises integrated phase lock chip sum counter.
4. electric energy quality for substation monitoring device according to claim 1, is characterized in that, described frequency overlapped-resistable filter is active power filtering chip.
5. electric energy quality for substation monitoring device according to claim 1, is characterized in that, principal and subordinate's card cascade of described hyperchannel A/D change-over circuit.
6. the electric energy quality for substation monitoring device according to claim 1 to 5 any one, is characterized in that, also comprises the industrial computer be connected with described dsp chip.
7. electric energy quality for substation monitoring device according to claim 6, is characterized in that, also comprises the host computer be connected with described industrial computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520803964.XU CN205120856U (en) | 2015-10-15 | 2015-10-15 | Power quality monitor device of transformer substation |
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| CN201520803964.XU CN205120856U (en) | 2015-10-15 | 2015-10-15 | Power quality monitor device of transformer substation |
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| CN205120856U true CN205120856U (en) | 2016-03-30 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105974179A (en) * | 2016-07-01 | 2016-09-28 | 河北箱变电器有限公司 | Secondary equipment for monitoring partial discharge and temperature monitoring device |
| CN106054096A (en) * | 2016-07-01 | 2016-10-26 | 河北箱变电器有限公司 | Secondary equipment for monitoring partial discharging and temperature monitoring device |
| CN110456146A (en) * | 2019-09-04 | 2019-11-15 | 深圳宝龙达信创科技股份有限公司 | Power detection device and power detecting method |
-
2015
- 2015-10-15 CN CN201520803964.XU patent/CN205120856U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105974179A (en) * | 2016-07-01 | 2016-09-28 | 河北箱变电器有限公司 | Secondary equipment for monitoring partial discharge and temperature monitoring device |
| CN106054096A (en) * | 2016-07-01 | 2016-10-26 | 河北箱变电器有限公司 | Secondary equipment for monitoring partial discharging and temperature monitoring device |
| CN110456146A (en) * | 2019-09-04 | 2019-11-15 | 深圳宝龙达信创科技股份有限公司 | Power detection device and power detecting method |
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Effective date of registration: 20200810 Address after: 510665 No. 2 Tianhe two road, Tianhe District, Guangzhou, Guangdong Patentee after: Guangzhou Power Supply Bureau of Guangdong Power Grid Co.,Ltd. Address before: 510620 Tianhe District, Guangzhou, Tianhe South Road, No. two, No. 2, No. Patentee before: GUANGZHOU POWER SUPPLY Co.,Ltd. |