CN205562684U - Measurement device for earthing device impulse grounding resistance - Google Patents
Measurement device for earthing device impulse grounding resistance Download PDFInfo
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- CN205562684U CN205562684U CN201620305604.1U CN201620305604U CN205562684U CN 205562684 U CN205562684 U CN 205562684U CN 201620305604 U CN201620305604 U CN 201620305604U CN 205562684 U CN205562684 U CN 205562684U
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Abstract
The embodiment of the utility model provides a measurement device for earthing device impulse grounding resistance compares with prior art, utilizes current sample signal and voltage sampling signal's master frequency to calculate the earthing device impulse grounding resistance that awaits measuring, has and builds pattern simply, calculates conveniently and the high advantage of accuracy, in addition, still provide many wave forms impulse current output of 500V, 750V's etc. The output of a plurality of output voltage gear and 3080us and 10350us etc. Have small, move convenient, the security is high and be applicable to the field carries out the test to the earthing device impulse grounding resistance that awaits measuring.
Description
Technical field
This utility model relates to power system measuring field, particularly relates to the measurement of a kind of grounding device impulse earthed resistance
Device.
Background technology
In recent years, due to the continuous expansion of China's power system capacity, the ground lightning current serious threat that enters of amplitude is arrived
Operation of Electric Systems personnel and the safety of electrical equipment.In order to ensure the safe and reliable operation of power system, operation power and
Design department more focuses on grounding technology.The transmission line of electricity accident that thunder and lightning transmission line of electricity causes gets more and more, and traces it to its cause,
Be electric power line pole tower grounding device impulse earthed resistance and geodetic network's earth resistance excessive.Therefore, effectively reduce shaft tower to connect
Ground device impulse earthed resistance and geodetic network's earth resistance, be that the one of reduction transmission line lightning stroke fault is very effective
Approach.And as reducing tower grounding device and the premise of geodetic network's earth resistance and basis, detect ground connection effectively and accurately
Device impulse earthed resistance, causes the common concern of power industry.
Grounding device impulse earthed resistance is mainly obtained by following two approach at present, but the most all exists
Certain problem.1, on the basis of theory analysis, set up the mathematics physics model of impulse earthed resistance, but this kind of method
Modeling is difficult and solves loaded down with trivial details.2, by experimental analogic method measurement grounding device impulse earthed resistance, but existing impact
Equipment is heavier, is not suitable for measuring in the wild.
Therefore, it is necessary to the measurement to grounding device impulse earthed resistance is studied further, connect making up existing acquisition
The defect that ground device impulse earthed resistance method exists, thus for realizing reducing electric power line pole tower grounding device impulse grounding
Resistance and geodetic network's earth resistance lay the foundation, it is ensured that the safe and reliable operation of power system.
Utility model content
This utility model embodiment provides the measurement apparatus of a kind of grounding device impulse earthed resistance, to solve existing skill
The modeling existed when obtaining grounding device impulse earthed resistance in art is complicated, calculate loaded down with trivial details and poor accuracy；And it is existing
Grounding device apparatus for Measuring Impulse Grounding Resistance is bulky, mobile inconvenience, is not suitable for the problem applied in the wild.
In order to solve above-mentioned technical problem, this utility model embodiment discloses following technical scheme:
Disclosed in this utility model embodiment, the measurement apparatus of a kind of grounding device impulse earthed resistance, sends out including dash current
Raw device, signal acquisition module, master controller and outut device, wherein, the outfan electrical connection of this impulse current generator
To this grounding device to be measured, the input of this signal acquisition module electrically connects with this grounding device to be measured；This signals collecting mould
The outfan of block is electrically connected to the input of this master controller, and the outfan of this master controller is electrically connected to this outut device.
Preferably, this impulse current generator provides 500V, 750V, 1000V, 1250V, 1500V, 1750V and 2000V
Voltage output.
Preferably, this impulse current generator also provides for many ripples of 4/10us, 8/20us, 30/80us and 10/350us
Shape dash current exports.
Preferably, this impulse current generator is additionally provided with external capacitor interface.
Preferably, this includes the electric current output electrically connected with the outfan of this grounding device to be measured and this impulse current generator
Passage, and defeated with the first voltage that the pretreatment circuit of this grounding device to be measured and this signal acquisition module electrically connects respectively
Enter passage, the second voltage input channel, electric current input channel, the first current coil input channel and the second current coil defeated
Entering passage, wherein, this first current coil input channel is multiplex channel with this corresponding the second voltage input channel, should
Second current coil input channel and this electric current input channel are multiplex channel.
Preferably, pretreatment circuit and the sample circuit of this signal acquisition module is the isometric wiring of PCB circuit.
Preferably, this outut device is LCDs or serial printer, and this master controller is provided with USB interface.
Preferably, this master controller provides cable network communication and wireless network communication.
From above technical scheme, the measurement dress of the grounding device impulse earthed resistance that this utility model embodiment provides
Put, compared with prior art, utilize the basic frequency of current sampling signal and voltage sampling signal to calculate grounding device to be measured punching
Hit earth resistance, there is modeling simple, convenience of calculation and the high advantage of degree of accuracy；It addition, also provide for 500V, 750V
Deng the output of multiple output voltage gears and the multi-waveform impulse current output of 30/80us and 10/350us etc., there is body
Long-pending little, conveniently moving, safety are high and be applicable to field and carry out the test job to grounding device impulse earthed resistance to be measured.
Accompanying drawing explanation
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, below will to embodiment or
In description of the prior art, the required accompanying drawing used is briefly described, it should be apparent that, for ordinary skill people
For Yuan, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
The principle signal of the measurement apparatus of a kind of grounding device impulse earthed resistance that Fig. 1 provides for this utility model embodiment
Figure；
The functional framework of the measurement apparatus of a kind of grounding device impulse earthed resistance that Fig. 2 provides for this utility model embodiment
Figure；
The one of the measurement apparatus of a kind of grounding device impulse earthed resistance that Fig. 3 a provides for this utility model embodiment is real
Test wiring diagram；
The another kind of the measurement apparatus of a kind of grounding device impulse earthed resistance that Fig. 3 b provides for this utility model embodiment
Experimental wiring figure；
Another of the measurement apparatus of a kind of grounding device impulse earthed resistance that Fig. 3 c provides for this utility model embodiment
Experimental wiring figure；
Symbol table is shown as:
R1-shunt resistance, R2-the first divider resistance, R3-the second divider resistance.
Detailed description of the invention
For the technical scheme making those skilled in the art be more fully understood that in this utility model, below in conjunction with this practicality
Accompanying drawing in new embodiment, is clearly and completely described the technical scheme in this utility model embodiment, it is clear that
Described embodiment is only a part of embodiment of this utility model rather than whole embodiments.New based on this practicality
Embodiment in type, the every other reality that those of ordinary skill in the art are obtained under not making creative work premise
Execute example, all should belong to the scope of this utility model protection.
See Fig. 1, for measurement apparatus former of a kind of grounding device impulse earthed resistance that this utility model embodiment provides
Reason schematic diagram.Also can be found in Fig. 2, for the survey of a kind of grounding device impulse earthed resistance that this utility model embodiment provides
The functional framework figure of amount device.
The measurement apparatus of grounding device impulse earthed resistance disclosed in this utility model embodiment, occurs including dash current
Device, signal acquisition module, master controller and outut device, wherein, the outfan of this impulse current generator is electrically connected to
This grounding device to be measured, the input of signal acquisition module electrically connects with this grounding device to be measured, this signal acquisition module
Outfan is electrically connected to the input of this master controller, and the outfan of this master controller is electrically connected to outut device.Additionally,
All electrical equipments in the measurement apparatus having power-supply system to be this grounding device impulse earthed resistance are powered, the most not
Repeat.
Impulse current generator, can provide dash current for grounding device to be measured, for ability with manual simulation lightning electric current
Known to field technique personnel.As a kind of preferred version, impulse current generator disclosed in this utility model embodiment, carry
For the multiple gear voltages output needed for charging, such as 500V, 750V, 1000V, 1250V, 1500V, 1750V and 2000V
Voltage output.Being different from the output voltage that existing impulse current generator provides, this impulse current generator provides
Output voltage is on the premise of the holding of voltage range length is constant, and interval upper and lower limit voltage threshold reduces, and makes this impact electricity
The volume of flow-generator compared to existing technology in impulse current generator be substantially reduced, therefore make this utility model embodiment
The measurement apparatus entirety more motility of disclosed grounding device impulse earthed resistance, is not only suitable for indoor application, more adapts to
Field work.
Further, this impulse current generator also provide for multi-waveform impulse current output, as 4/10us, 8/20us,
The waveform impulse current output of 30/80us and 10/350us, compared to prior art, this utility model embodiment provides
Impulse current generator has the bigger scope of application, and can be substantially reduced dash current to calculating grounding device to be measured impact
The error that earth resistance causes.
Further, this impulse current generator arranges the high-voltage capacitance of 10uf/2500V as dash current except inside
Outside source, it is additionally provided with external capacitor interface.In use, this impulse current generator can pass through according to actual needs
This external capacitor interface extends out a high-voltage capacitance, plays the effect adjusting waveform.
Signal acquisition module mainly includes pretreatment circuit and Acquisition Circuit.
The current signal that pretreatment main circuit to realize producing grounding device to be measured is decayed, altogether with response voltage signal
Mould, filtering and A/D conversion process, wherein, attenuator circuit includes diverter and potentiometer, such as the shunt resistance in Fig. 1
Shown in R1 and divider resistance R2 and R3.Certainly, to this current signal and the pretreatment operation of response voltage signal, also may be used
Meet, with other including that this utility model embodiment do not provides, other operation that this utility model requires, be not limited thereto.
Additionally, in order to make between circuit without the most electric connection, isolation module can be arranged in circuit, as changed at A/D
Shaping piece is set between device and memorizer.The pretreatment operation of the common signal of telecommunication is the routine operation of electricity field, for ability
Known to field technique personnel, do not repeat them here.
Sample circuit mainly utilizes fpga chip to realize the sampling to signal.Fpga chip is showing of multi-functional, low-power consumption
Field programmable gate array, is responsible for controlling high speed acquisition and the storage of data, when receiving the triggering that CL Compare Logic device provides
After signal, the startup order of high-speed sampling can be sent, and control the storage of the sampled data exported by bus.Utilize FPGA
Chip structure sample circuit, to complete the sampling to the required signal of telecommunication, is well known to those skilled in the art, at this no longer
Repeat.
Further, in order to make all signals can meet timing requirements, and it is reduced as far as all signals at PCB
The difference of upper transmission delay, as a kind of preferred version, the pretreatment circuit of this signal acquisition module and sample circuit are
The isometric wiring of PCB.
See Fig. 3 a, for this utility model embodiment provide a kind of grounding device impulse earthed resistance measurement apparatus one
Plant experimental wiring figure；See Fig. 3 b, for the survey of a kind of grounding device impulse earthed resistance that this utility model embodiment provides
The another kind of experimental wiring figure of amount device；See Fig. 3 c, a kind of grounding device impact provided for this utility model embodiment
Another experimental wiring figure of the measurement apparatus of earth resistance.
As a kind of preferred version, this signal acquisition module includes occurring with this grounding device to be measured and this dash current respectively
The current output channels of the outfan electrical connection of device, and pre-with this grounding device to be measured and this signal acquisition module respectively
Process the first voltage input channel of circuit electrical connection, the second voltage input channel, electric current input channel, the first electric current line
Circle input channel and the second current coil input channel, wherein, the first current coil input channel is logical with the second voltage input
Road is set to multiplex channel, and the second current coil input channel and electric current input channel are set to multiplex channel, with further
Improve channel utilization index.
The measurement apparatus of grounding device impulse earthed resistance disclosed in this utility model embodiment be provided with current output interface,
Voltage output interface 1, voltage output interface 2, electric current input interface, current coil input interface 1 and current coil input
Interface 2, inside be correspondingly arranged respectively this current output channels, the first voltage input channel, the second voltage input channel,
Electric current input channel, the first current coil input channel and the second current coil input channel.This current output interface, for
The input and output interfaces of the dash current that this impulse current generator produces；Electric current input interface is used for gathering in measurement loop
Current signal；Voltage output interface 1 and voltage output interface 2 are respectively used to measure the voltage signal in loop, pass through
Measure the magnitude of voltage of two various locations on the both direction of grounding device to be measured or same direction, sense by impact electricity
The voltage pulsation that stream fluctuation produces, and then improve testing efficiency；Current coil input interface is for inputting by external electrical streamline
The current signal that circle gathers.
Master controller, such as ARM11 (embedded board), for the measurement apparatus of this grounding device impulse earthed resistance
Overall control, obtains the basic frequency of current sampling signal and the voltage sampling signal provided by signal acquisition module respectively, and
The basic frequency utilizing this current sampling signal and voltage sampling signal calculates the impulse earthed resistance of this grounding device to be measured, meter
Calculation method such as utilizes formula R=u/i, calculates the business of the basic frequency of this current sampling signal and voltage sampling signal, as this
Impulse earthed resistance.The transmission of this impulse earthed resistance is shown by this master controller to outut device.It should be noted that
Obtain the operation of the common signal of telecommunication, as obtained current signal or the basic frequency of voltage signal, be well known to those skilled in the art,
Do not repeat at this.
As a kind of preferred version, the built-in communications protocol of this master controller, it is possible to provide cable network communication and wireless network lead to
News, for realizing transmitting data between computer, it is simple to policer operation in real time.
Outut device receives the impulse earthed resistance that master controller calculates, and shows.This outut device can be liquid
Crystal display screen (LCD) or serial printer.Further, this master controller is additionally provided with USB interface, treats for derivation
Survey the impulse earthed resistance of grounding device or complete the optimization and upgrading to this master controller plug-in.
The measurement apparatus of grounding device impulse earthed resistance disclosed in this utility model embodiment, by utilizing current sample to believe
Number and the basic frequency of voltage sampling signal, calculate the impulse earthed resistance of grounding device to be measured, possess that modeling is simple, calculate
The advantage that process is easy and computational efficiency is high；It addition, grounding device impulse earthed resistance disclosed in this utility model embodiment
Measuring method calculate grounding device impulse earthed resistance time, be little affected by electric capacity and the shadow of inductance in grounding device to be measured
Ring, the computational accuracy to impulse earthed resistance can be effectively improved；Additionally, grounding device disclosed in this utility model embodiment
The measurement apparatus of impulse earthed resistance, also provides for 500V, 750V, 1000V, 1250V, 1500V, 1750V and 2000V
Multiple output voltage gears output and the multi-waveform impulse current of 4/10us, 8/20us, 30/80us and 10/350us
Output, has that volume is little, conveniently moving, safety are high and are applicable to field and carry out grounding device impulse grounding to be measured electricity
The test job of resistance.
It should be noted that in this article, such as the relational terms of " first " and " second " or the like be used merely to by
One entity makes a distinction with another entity, and not necessarily requires or imply and there is any this reality between these entities
The relation on border or order.And, term " includes " being intended to comprising of nonexcludability, so that include that one is
The equipment of row key element not only includes those key elements, but also includes other key elements being not expressly set out, or also includes
The key element intrinsic for this equipment.In the case of there is no more restriction, statement " including ... " key element limited,
It is not precluded from there is also other identical element in the equipment including described key element.
The above is only detailed description of the invention of the present utility model, makes to skilled artisans appreciate that or realize this reality
With novel.Multiple amendment to these embodiments will be apparent to one skilled in the art, herein institute
The General Principle of definition can realize in the case of without departing from spirit or scope of the present utility model in other embodiments.
Therefore, this utility model is not intended to be limited to the embodiments shown herein, and is to fit to disclosed herein
Principle and the consistent the widest scope of features of novelty.
Claims (8)
1. the measurement apparatus of a grounding device impulse earthed resistance, it is characterised in that include impulse current generator, letter
Number acquisition module, master controller and outut device, wherein,
The outfan of described impulse current generator is electrically connected to described grounding device to be measured, described signal acquisition module defeated
Enter end to electrically connect with described grounding device to be measured；
The outfan of described signal acquisition module is electrically connected to the input of described master controller, the output of described master controller
End is electrically connected to described outut device.
The measurement apparatus of grounding device impulse earthed resistance the most according to claim 1, it is characterised in that described punching
Hit current feedback circuit and the voltage output of 500V, 750V, 1000V, 1250V, 1500V, 1750V and 2000V is provided.
The measurement apparatus of grounding device impulse earthed resistance the most according to claim 2, it is characterised in that described punching
Hit current feedback circuit and also provide for the multi-waveform impulse current output of 4/10us, 8/20us, 30/80us and 10/350us.
The measurement apparatus of grounding device impulse earthed resistance the most according to claim 2, it is characterised in that described punching
Hit current feedback circuit and be additionally provided with external capacitor interface.
The measurement apparatus of grounding device impulse earthed resistance the most according to claim 1, it is characterised in that described letter
Number acquisition module includes the electric current output electrically connected with the outfan of described grounding device to be measured and described impulse current generator
Passage, and the first electricity that pretreatment circuit with described grounding device to be measured and described signal acquisition module electrically connects respectively
Pressure input channel, the second voltage input channel, electric current input channel, the first current coil input channel and the second electric current line
Circle input channel, wherein, described first current coil input channel is multiplexing with corresponding described second voltage input channel
Passage, described second current coil input channel and described electric current input channel are multiplex channel.
The measurement apparatus of grounding device impulse earthed resistance the most according to claim 1, it is characterised in that described letter
Pretreatment circuit and the sample circuit of number acquisition module are the isometric wiring of PCB circuit.
The measurement apparatus of grounding device impulse earthed resistance the most according to claim 1, it is characterised in that described defeated
Going out equipment is LCDs or serial printer, and described master controller is provided with USB interface.
The measurement apparatus of grounding device impulse earthed resistance the most according to claim 7, it is characterised in that described master
Controller provides cable network communication and wireless network communication.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105842542A (en) * | 2016-04-13 | 2016-08-10 | 云南电网有限责任公司电力科学研究院 | Grounding device impacted grounding resistance measuring method and system |
-
2016
- 2016-04-13 CN CN201620305604.1U patent/CN205562684U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105842542A (en) * | 2016-04-13 | 2016-08-10 | 云南电网有限责任公司电力科学研究院 | Grounding device impacted grounding resistance measuring method and system |
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