CN204154805U - A kind of low-tension current wireless measurement device - Google Patents
A kind of low-tension current wireless measurement device Download PDFInfo
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- CN204154805U CN204154805U CN201420628219.1U CN201420628219U CN204154805U CN 204154805 U CN204154805 U CN 204154805U CN 201420628219 U CN201420628219 U CN 201420628219U CN 204154805 U CN204154805 U CN 204154805U
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Abstract
The utility model relates to a kind of low-tension current wireless measurement device, mainly for the circuit laid, and the low voltage power transmission occasion of inconvenient power failure dismounting, a kind of long-term, real-time current monitoring device is provided, can be applicable to electricity consumption monitoring, the occasions such as inspection of opposing electricity-stealing.Form primarily of current sample processing section, protocol Control part, wireless transmission part and draw-out power supply part.The utility model can survey that range of current is wide, intensity is large, and need not have a power failure installation, possesses wireless communication interface.Have employed the powering mode that induction power taking combines with powered battery, work flying power is lasting.
Description
Technical field
The utility model belongs to electric parameter measurement field, relate in particular to a kind of can the low-tension current wireless measurement device of charged handling.
Background technology
The Measurement accuracy of line current is significant in electrical measurement; particularly do not shut down at the non-dismounting of circuit, equipment, current capacity under real-time online condition measure, inspections of Live wires road, malfunction elimination, oppose electricity-stealing check in extensive application demand.
At present, the threading type current transformer of the many uses of non-access route survey of alternating current realizes, have accuracy high, on the transmission line of electricity impact advantage such as little, but due to needs threading, just consider to install when this current measuring device needs at layout of roads and lays, or to line outage and threading again, be therefore used for instrument and equipment, distribution control box occasion that is inner or that just no longer change after installing.This outside wirepulling current transformer many employings hard magnetic core, its measurement range is narrower, once magnetic core is saturated just can not Measurement accuracy again.The open type current transformer that other adopts, this current measuring device does not need threading, with digital instrument one, in-site measurement is more convenient, be suitable for most low-voltage distributing line ad hoc inspection and repair occasion, but be all the hard magnetic core current transformer adopted mostly, measurement range is narrower, be not suitable for the occasion that big current, wide-range current and voltage are higher, the unattended measurement demand that the time that is also not suitable for is longer.The photoelectrical current sensing measures of current hotspot research can make up the shortcoming of above-mentioned ordinary electric current mutual-inductor, measurement range is wide, hardly transmission line of electricity is impacted, be applicable to high-voltage applications, can not have a power failure and install, but there is the shortcomings such as equipment complexity, stability and antijamming capability are poor, work power taking is difficult.In addition this kind of current measuring device is scarcely with data-interface, is not suitable for long-time and unattended occasion, although some has wireless communication interface, there is again installation, changes the shortcomings such as all inconvenient.
Rogowski coil is another current transformer, and its inside does not have magnetive cord, thus measurement range wide, can not saturated, the linearity good, dangerous without second open circuit, but price is relatively high, and range of application is relatively little.
The excellent performance of Rogowski coil is for the invention provides resolving ideas.The present invention is mainly for the circuit laid, and the low voltage power transmission occasion of inconvenient power failure dismounting, provides a kind of long-term, real-time current monitoring device, can be applicable to electricity consumption monitoring, the occasions such as inspection of opposing electricity-stealing.
Summary of the invention
The utility model is chronicity in order to adapt to electricity consumption monitoring and real-time needs, and adapt to transmission line of electricity and laid and be difficult to again lay, tested range of current is wide, intensity large, needs the current measurement do not had a power failure when installing.
In order to realize above-mentioned target, the technical solution adopted in the utility model is made up of four partial function circuit: current sample processing section, protocol Control part, wireless transmission part and draw-out power supply part.
Described current sample processing section uses flexible Rogowski coil to carry out current sample, utilizes dedicated three-phase electric energy computation chip to carry out the calculating of current effective value.This part can not have a power failure dismounting, is responsible for sampling to the electric current of measured circuit, after filtering, amplification, digital integration and AD conversion, calculates the real effective of measured electric current, for protocol Control part.
The process of described protocol Control part primary responsibility communication protocol, controls, with the communication process of miscellaneous equipment, to complete the low-power dissipation power supply management function of apparatus of the present invention simultaneously.This part take High Performance SCM as process core, use embedded type C language development program, its main task is resolve the Frame received, fetch the current true virtual value that the measurement of current sample processing module obtains, return frame by the response of communication protocol tissue to receiving data frames, control wireless transmission part and make response response; According to the mode of operation of setting, the power management of finishing device.
Described wireless transmission part is responsible for the control of wireless transmission protocol, provides a kind of wave point interface, realizes with wireless transmission method apparatus of the present invention to be connected the data of instrument and equipment concrete transmission with other.
Described draw-out power supply part is responsible for whole device and provides electric energy, takes induction energy fetching coil to want the mode that combines, the even running of assurance device from induction energy fetching transmission line of electricity and rechargeable battery.
As preferably, described current sample processing section uses flexible Rogowski coil to sample, adopt the design of plug-in opening, conveniently do not change circuit, do not have a power failure dismounting, measurement wire range is 3-80mm, range of current is 0-500A, electric pressure is 10kV, in 0 ~ 30A range of current, accuracy of measurement is better than ± and 1.5%, in 30 ~ 350A range of current, accuracy of measurement is better than ± and 0.5%.
As preferably, described protocol Control part data communication protocol supports DL/T 645-2007 agreement; Possesses the discontinuous operation pattern of normal mode of operation and " work-dormancy-work-dormancy ".
As preferably, described wireless transmission part possesses 16 communication channels, and channel can be selected arbitrarily, prevents communication contention aware and interference; 8 kinds of optional emissive powers are set simultaneously, to control power consumption.
As preferably, the inductive coil of described draw-out power supply part adopts the semicircle silicon sheet core of open type, and its cross section is 20mm × 50mm, and coil turn is 150, adds up to air gap to be no more than 3mm.With DC-DC switch transition power supply for the voltage stabilizing step-down core after induction power taking, convert electrical energy into the electric current of 5V voltage, maximum 1A, for device and charging.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present utility model.
Fig. 2 is draw-out power supply modular design block diagram of the present utility model.
Embodiment
In conjunction with the accompanying drawings and embodiments the utility model is further illustrated as follows:
As shown in Figure 1, the utility model is a kind of low-tension current wireless measurement device, is made up of current sample processing section 1 circuit, protocol Control part 2 circuit, wireless transmission part 3 circuit and draw-out power supply part 4 circuit four part.
Current sample processing section 1 uses flexible Rogowski coil 5 pairs of two buss lines 6 to carry out current sample, according to the principle of work of Rogowski coil, obtains the current signal with the proportional relation of differential of bus current.Voltage signal is transformed into through pull-up resistor after-current signal, again after filtering 7 processes, special electric energy computation chip 8 (ADE7878) is sent to process, the circuit such as the built-in gain amplifier of computation chip 8, digital integrator and second order es-Δ formula AD conversion, carry out digital integration (obtaining and current in proportion signal), AD conversion to signal and calculate the real effective of tested electric current.Protocol Control part 2 selects AVR processor 9(ATmega8-168PA) be control core, according to the reading requirement of far-end connection device 11, read back from current sample processing section 1 by spi bus the real effective of tested electric current, organize reply data frame according to DL/T 645-2007 agreement organizations form, control wireless transmission part 3 and send to remote host 11 by the wireless channel identical with reception.Wireless transmission part 3 is responsible for concrete Data Transport Protocol and is controlled, select low-power consumption Zigbee wireless communication technology, with TI CC2530 chip 10 host-host protocol control module, support ZigBee 2007 protocol stack, its radio transmitted power and communication channel can be determined by communication negotiation.。
The utility model device possesses two kinds of mode of operations: normal mode of operation and discontinuous operation pattern, and wherein discontinuous operation pattern is in the alternately lower work of " work " and " dormancy " two states, adapts to the inadequate situation of electric energy, to reach energy-conservation object.
In the normal mode of operation, remote equipment can directly to apparatus of the present invention request measurement data, and after receiving request of data, this device is about to measure the current data obtained, and is transmitted to remote equipment with the emissive power designed.
Under discontinuous operation pattern, remote equipment needs first to send to this device to wake hold instruction up, after this device correctly receives and wakes hold instruction up, reply is waken up and keeps confirming response, and time-out enters dormant state a period of time, ensure the data transmission receiving remote equipment.Remote equipment receive this device wake up keep confirm response after, should setting time in apparatus of the present invention request measurement data, after exceeding setting-up time, this device will enter discontinuous operation pattern again.After this device receives request of data, be about to measure the current data that obtains, be transmitted to remote equipment with the emissive power designed, and carry out again timing wait for laggard enter discontinuous operation state.
Power supply supply of the present utility model takes the mode that induction energy fetching combines with rechargeable battery and large bulk capacitance, and accompanying drawing 2 is its structure principle chart.Inductive coil 12 adopts the semicircle silicon sheet core of open type, and its cross section is 20mm × 50mm, and coil turn is 150, and air gap delta 1 and the 2-in-1 meter of δ are no more than 3mm.Coordinate through front end circuit 13, current rectifying and wave filtering circuit 14, protection circuit 15 DC voltage produced, one end is to Power Management Unit 16, and the other end is to Charge Management unit 17.Power Management Unit 16 is with PWM-type dc-dc 19(MAX5035) be front end step-down core devices, supply voltage is remained 5V.Charge Management unit 17 selects UC3906 chip, provides four kinds of charged states, plays the max cap. of battery 18, extends the serviceable life of battery 18.When transmission line of electricity electric current is comparatively large, during more than 6A, induction power taking electric power is sufficient, gets energy coil directly to system power supply, and charges to battery 18; When transmission line of electricity electric current is less or without electricity, by battery 18 pairs of system power supplies, the continuous firing steady in a long-term of the utility model device can be ensured.
Claims (4)
1. a low-tension current wireless measurement device, is characterized in that it comprises four main functional circuit parts: current sample processing section, protocol Control part, wireless transmission part and draw-out power supply part; Using flexible Rogowski coil as current sample sensor, can not have a power failure handling; Possess wireless communication interface interface, DL/T 645-2007 agreement is supported in data communication support; Working power adopts the mode combined with powered battery from bus induction energy fetching.
2. a kind of low-tension current wireless measurement device according to claim 1, it is characterized in that adopting flexible Rogowski coil as current sample sensor, using special electrical energy measuring IC as data processing unit, current measuring range is wide to 0-500A, electric pressure 10kV, can not have a power failure handling.
3. a kind of low-tension current wireless measurement device according to claim 1, is characterized in that possessing wireless communication interface interface, and radio communication can arrange 8 kinds of optional emissive powers.
4. a kind of low-tension current wireless measurement device according to claim 1, it is characterized in that the power acquisition of the device form combined with battery from bus induction energy fetching, induction energy fetching coil adopts the semicircle silicon sheet core of open type, leaves air gap and prevents too early magnetic saturation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420628219.1U CN204154805U (en) | 2014-10-28 | 2014-10-28 | A kind of low-tension current wireless measurement device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420628219.1U CN204154805U (en) | 2014-10-28 | 2014-10-28 | A kind of low-tension current wireless measurement device |
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| CN204154805U true CN204154805U (en) | 2015-02-11 |
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| CN201420628219.1U Active CN204154805U (en) | 2014-10-28 | 2014-10-28 | A kind of low-tension current wireless measurement device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104198805A (en) * | 2014-09-18 | 2014-12-10 | 黑龙江省电工仪器仪表工程技术研究中心有限公司 | Low-voltage current wireless measuring device capable of being demounted in electrified manner |
| CN110208587A (en) * | 2019-07-16 | 2019-09-06 | 国家电网有限公司 | A kind of 10KV route is opposed electricity-stealing monitoring device |
-
2014
- 2014-10-28 CN CN201420628219.1U patent/CN204154805U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104198805A (en) * | 2014-09-18 | 2014-12-10 | 黑龙江省电工仪器仪表工程技术研究中心有限公司 | Low-voltage current wireless measuring device capable of being demounted in electrified manner |
| CN110208587A (en) * | 2019-07-16 | 2019-09-06 | 国家电网有限公司 | A kind of 10KV route is opposed electricity-stealing monitoring device |
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