CN207336616U - A kind of distribution network capacitance current test high speed tester - Google Patents
A kind of distribution network capacitance current test high speed tester Download PDFInfo
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- CN207336616U CN207336616U CN201721085360.1U CN201721085360U CN207336616U CN 207336616 U CN207336616 U CN 207336616U CN 201721085360 U CN201721085360 U CN 201721085360U CN 207336616 U CN207336616 U CN 207336616U
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- capacitance current
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Abstract
The utility model discloses a kind of distribution network capacitance current test high speed tester, including babinet, the operation panel positioned at box top or side, and circuit module and power module positioned at box house.During measurement, measurement line is connected with the open delta side of voltage transformer, selects corresponding voltage gear, and tacheometer can be automatically performed measurement and by capacitance current the results show on operation panel.The utility model need not carry out wait dispatch command and carry out cumbersome grid switching operation, drastically increase the efficiency of capacitance current measurement work, this measurement work is become safe, simple, quick, and test result is very accurate, stablizes, reliably.
Description
Technical field
Power equipment technical field of measurement and test is the utility model is related to, more particularly to a kind of distribution network capacitance current test is quickly tested
Instrument.
Background technology
As net capacity increases, the distribution capacity on system line is also increasing.In the power supply of China's distribution network systems
Property point be not directly grounded usually, when singlephase earth fault occurs for circuit, the electric current for flowing through trouble point is really circuit pair
The capacitance current that ground capacitance produces.
The main reason for distribution network systems failure be circuit occur singlephase earth fault when, line capacitance it is excessive and can not be voluntarily
Extinguish, the influence that trouble point electric arc brings electric power system is extremely serious.Therefore, the electric power code regulation in China as 10kV and
When 35kV system capacitive currents are respectively greater than 30A and 10A, arc suppression coil should be installed with compensating electric capacity electric current, otherwise will be in list
Due to arc reignition when being mutually grounded, very high overvoltage is produced, jeopardizes the insulation for perfecting phase and causes two-phase short-circuit fault.
The method of traditional measurement distribution network capacitance current test has direct method, the additional capacitance indirect method of measurement that Single Phase Metal is grounded
Deng, for these methods in measurement, testing crew will touch primary equipment, and personnel cannot ensure with equipment safety, while
There are trivial operations and maloperation equivalent risk.
Utility model content
The deficiency for more than, the utility model, which provides one kind, can be not directly contacted with primary equipment, from distribution mutual induction of voltage
Device secondary side measures the high speed tester of system capacitive current value.
To reach above-mentioned purpose, the utility model adopts the following technical solution：
A kind of distribution network capacitance current test high speed tester, including babinet, the operating surface positioned at the box top or side
Plate, and circuit module and power module positioned at the box house, the operation panel include signal input port, show
Show module, print module and usb interface module, the operation panel is to setting measurement parameter and display data；The electricity
Road module includes control module, constant current source module, voltage measurement module, phase angle measurement module, filter module, data storage mould
Block, the control module and the constant current source module, filter module, display module, print module and data memory module phase
Even, the constant current source module is connected with the voltage measurement module, phase angle measurement module, and the voltage measurement module, phase angle are surveyed
Amount module is connected with the filter module respectively；The power module is electric to be provided to the operation panel and circuit module
Energy.
Further, the power module includes AC/DC power, Power Management Unit, lithium battery, inverter
And DC-DC power supply, the Power Management Unit respectively with the DC-DC power supply, AC/DC power, inversion
Device is connected with lithium battery.
Further, the babinet has metal shell, and the operation panel also has ground terminal, the ground terminal and institute
The metal shell for stating babinet is connected.
Further, display module includes capacitance touch liquid crystal display, the capacitance touch liquid crystal display
Equipped with brightness regulation knob to adjust brightness.
Further, the control module includes digital signal processor, to realize in measurement process analog quantity and
Mutual conversion between digital quantity, measured value calculate, result of calculation exports and preserve.
Further, the operation panel has further included instrument switch and power interface.
Further, the operation panel has further included fuse, and the fuse is connected with the instrument switch.
Further, the print module includes printing end to print data.
Further, the usb interface module includes USB interface.
Further, the operation panel has further included power supply indicator.
Compared with prior art, the beneficial effects of the utility model are：
1. testing crew need not come into contacts with the high-pressure side of primary equipment, because the danger of experiment may be not present.Measurement
When, only need to will measurement line be connected with the open delta side of voltage transformer, select corresponding voltage gear, press measurement by
Button, high speed tester can be automatically performed measurement and by capacitance current the results show on liquid crystal display.
2. need not carry out waiting dispatch command and carry out cumbersome grid switching operation, capacitance current measurement is drastically increased
The efficiency of work, makes this measurement work become safe, simple, quick, and test result is very accurate, stablizes, reliably.
3. during measurement, two fixed frequencies of 14Hz, 180Hz are injected separately into, i.e., are injected in voltage transformer open delta side
Two electric currents, 14Hz frequencies can accurately measure capacitance, and 180Hz frequencies can accurately measure leakage reactance value.By measuring respectively
Voltage and phase angle under each frequency, so as to calculate measurement result.For running distribution network systems, voltage transformer opening
There are the unbalance voltage of small 50Hz, this interference voltage is superimposed with measured signal, can be to tested for triangle side
Signal produces certain interference.Two standard signals of injection can effectively avoid 50Hz power-frequency voltages, while pass through internal circuit
Filter module, interference voltage is eliminated, and then accurately measure the amplitude and phase angle difference of this voltage to frequency, with having derived
The accurate measuring system capacitance current value of formula；, still can be accurate when measured capacitance values are more than 100 μ F and computational stability is good
Really measurement.
Brief description of the drawings
It is required in being described below to embodiment in order to illustrate more clearly of the technical solution of the utility model embodiment
The attached drawing used is briefly described.
Fig. 1 is the structure diagram of the utility model；
Fig. 2 is the structure diagram of operation panel；
Fig. 3 for control module, constant current source module, voltage measurement module, phase angle measurement module, filter module, display module,
The circuit diagram of print module and data memory module；
Fig. 4 is the electrical schematic of power module and power module.
Embodiment
The following is a combination of the drawings in the embodiments of the present utility model, and the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describe.Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are without creative efforts
All other embodiments obtained, shall fall within the protection scope of the present invention.
Fig. 1 to Fig. 3 is refer to, the utility model is preferably implemented to provide a kind of distribution network capacitance current test high speed tester, bag
Babinet 9 is included, positioned at the operation panel 10 of 9 top surface of babinet, and circuit module and power module inside babinet 9.Operation
Panel 10 includes signal input port 19, display module 6, print module 7 and usb interface module, and operation panel 10 is setting
Determine measurement parameter and display data；Circuit module includes control module 1, constant current source module 2, voltage measurement module 3, phase angle
Measurement module 4, filter module 5, data memory module 8, control module 1 and constant current source module 2, filter module 5, display module 6,
Print module 7, data memory module 8 are connected, and constant current source module 2 is connected with voltage measurement module 3, phase angle measurement module 4, voltage
Measurement module 3, phase angle measurement module 4 are connected with filter module 5 respectively；Power module is to operation panel 10 and circuit module
Electric energy is provided.
Control module 1, constant current source module 2, voltage measurement module 3, phase angle measurement module 4, filter module 5, display module
6th, the circuit connecting relation of print module 7 and data memory module 8 is as shown in Figure 3.
Further, power module includes 22,220V/+30V AC/DC powers of a Power Management Unit
21st, inverter 24,23 ,+30/ ± 5V DC-DC power supplies 25 of lithium battery and+30/ ± 9V DC-DC power supply
25, Power Management Unit 22 respectively with DC-DC power supply 25,23 phase of AC/DC power 21, inverter 24 and lithium battery
Even.Power module is connected by power interface 20 with external power supply to realize that external power supply charges lithium battery 23.Instrument
Main power source uses rechargeable lithium battery, convenient, fast without external power supply, test process in measure field.Main power source is provided with
Automatic electricity-saving pattern, when instrument did not operate in 2 minutes, background light is by automatic distinguishing；Arbitrary steps are operated, background light is automatic
Light.Power module is to control module 1, constant current source module 2, voltage measurement module 3, phase angle measurement module 4, filter module 5, aobvious
Show module 6, print module 7 and 8 electrical schematic of data memory module as shown in figure 4, i.e. Power Management Unit 22 directly with survey
Module 1 to be controlled to be connected, inverter 24 is connected with display module 6 ,+30/ ± 5V DC-DC power supplies 25 and voltage measurement module 3,
Phase angle measurement module 4, filter module 5, print module 7 are connected with data memory module 8 ,+30/ ± 9V DC-DC power supplies 25
It is connected with constant current source module 2.
Preferably, babinet 9 has metal shell, and operation panel 10 also has ground terminal 11, the gold of ground terminal 11 and babinet 9
Belong to shell to be connected.Tool housing is connected using metal material, ground terminal 11 with tool housing, and instrument is before use, it is necessary to
Using Special grounding wire by tool housing and grounding body reliable ground, with the safety of guarantee test personnel.
Display module 6 includes capacitance touch liquid crystal display 12 and is shown for measurement process operation and measurement result,
All operations can be carried out by capacitance touch liquid crystal display 12 in test process, reduce the design of function button, capacitance
Equipped with brightness regulation knob 13 to adjust brightness, testing crew can be adjusted and shown formula touching liquid-crystal display screen 12 according to surrounding environment
The brightness of screen is to facilitate reading.
Preferably, control module 1 includes digital signal processor, to realize analog quantity and digital quantity in measurement process
Between mutual conversion, measured value calculates, result of calculation output and preserves.The relevant pins of DSP chip are with showing
Show that module 6, print module 7, data memory module 8 are connected.
Operation panel 10 has further included instrument switch 15 and fuse 14, and fuse 14 is connected with instrument switch 15.Insurance
Silk 14 is two pieces, wherein one piece is spare, size of current is 10A.
Print module 7 includes printing end 16 to print data.Print module 7 can be printed when time data of measurement,
Or read history of printing data after data memory module 8.
Usb interface module includes usb 17, usb 17 can automatic identification movable storage device, by historical data
Copy is easy to achieve, analysis.
Operation panel 10 has further included power supply indicator 18.Power supply indicator 18 can provide instruction for charging, and red light is to fill
Electricity condition, green light are charging complete state, blinking red lamp during not enough power supply.Power module has warning function, and display module 6 can
Display instrument current electric quantity, when main power power-supply electricity is less than 20%, capacitance touch liquid crystal display 12 will send that " electricity is not
Foot " is reminded, and when electricity is less than 10%, capacitance touch liquid crystal display 12 will send " please charge " and remind, instrument stopping measurement,
Print job, but data preservation, read work can be provided.
Instrument matches operation software, and all behaviour can be carried out by capacitance touch liquid crystal display 12 in test process
Make.
Data memory module 8 includes the storage and reading of measurement data, and storage uses ROM memory of the capacity for 8GB, reads
Take and use USB interface interactive mode.8 input port of data memory module is connected with control module 1, and by control module 1 with showing
Show that module 6, print module 7 are connected.
Constant current source module 2 by signal input port 19 to voltage transformer open delta incoming frequency be 14Hz, 180Hz
Current signal, voltage measurement module 3 and phase angle measurement module 4 can from acquisition system at voltage transformer open delta this two
Magnitude of voltage and angle values under a frequency, measurement result are transmitted to control module 1 and are calculated.
Filter module 5, can will be small at voltage transformer open delta by hardware filtering and digital filtering technique
The unbalance voltage of 50Hz and other interference voltages filter out, and improve measurement, computational accuracy.
Quickly measured to preferably use this tester to carry out distribution network capacitance current test, following complement operation can be carried out：
Charge before use, power cord should be connected to this tacheometer, when power supply indicator switchs to green light by red, charging
Complete；
Before measurement, by 11 reliable ground of ground terminal of this instrument；
Before measurement, voltage transformer secondary side three-phase voltage and open delta voltage are measured respectively using universal meter.If three
The difference of phase voltage maxima and minima is not much different with open delta voltage, and it is correct to illustrate the open delta；Conversely, say
The bright open delta that finds is incorrect, or open delta is likely to occur broken string；
Check whether the distribution network systems neutral point is equiped with compensation device, compensation device should all be exited if having；
Check whether the voltage transformer neutral point of the distribution network systems is equiped with resonance eliminator, should be by resonance eliminator short circuit if having；
If part is equiped with and part does not install resonance eliminator, can be measured in the voltage transformer for not installing resonance eliminator；
If two sections of bus-bar potential transformers of the distribution network systems are parallel running, secondary winding should be changed into isolated operation
Mode；
If the load impedance accessed at voltage transformer open delta is less than 100 Ω, load should be disconnected.
The course of work of the utility model is：
By the signal input port 19 of one end access high speed tester of p-wire, the other end accesses distribution network systems to be measured
At voltage transformer open delta, instrument switch is opened, is done in display module 6 according to the voltage class of tested distribution and accordingly set
Put, start to measure after being provided with.During measurement, control module 1 produces one to 2 Injection Signal of constant current source module, constant current source module 2
The signal injecting voltage mutual inductor open delta of a 14Hz, 180Hz, voltage sample module 3 and phase angle acquisition module 4 are distinguished
Voltage under the two frequencies, angle values are gathered, filtered module 5 filters, and transmits signals to control module 1, observing and controlling mould
Block 1 exports result to display module 6 after calculating；When tester selects " printing " on display module 6, control module
1 exports data to print module 7, is printed by printing end 16, when tester selects " to protect on display module 6
Deposit ", result of calculation is write the ROM memory of data memory module 8 by control module 1, when tester selects on display module 6
Select " reading historical data ", control module 1 reads historical measurement from the ROM memory of data memory module 8, works as tester
After USB flash disk is connected to usb 17 by member, " copy " is selected on display module 6, can be by this test result or history measurement knot
Fruit is exported to movable storage device.
The above, is only specific embodiment of the present utility model, but the scope of protection of the utility model is not limited to
In this, any one skilled in the art is in the technical scope that the utility model discloses, the change that can readily occur in
Change or replace, should be covered within the scope of the utility model.Therefore, the scope of protection of the utility model should be with described
Subject to scope of the claims.
Claims (10)
1. a kind of distribution network capacitance current test high speed tester, including babinet（9）, positioned at the babinet（9）Top surface or the behaviour of side
Make panel（10）, and positioned at the babinet（9）Internal circuit module and power module, it is characterised in that：The operating surface
Plate（10）Include signal input port（19）, display module（6）, print module（7）And usb interface module, the operating surface
Plate（10）To setting measurement parameter and display data；The circuit module includes control module（1）, constant current source module
（2）, voltage measurement module（3）, phase angle measurement module（4）, filter module（5）, data memory module（8）, the control module
（1）With the constant current source module（2）, filter module（5）, display module（6）, print module（7）And data memory module（8）Phase
Even, the constant current source module（2）With the voltage measurement module（3）, phase angle measurement module（4）It is connected, the voltage measurement mould
Block（3）, phase angle measurement module（4）Respectively with the filter module（5）It is connected；The power module is to the operation panel
（10）Electric energy is provided with circuit module.
2. distribution network capacitance current test high speed tester according to claim 1, it is characterised in that：The power module includes
AC/DC power（21）, Power Management Unit（22）, lithium battery（23）, inverter（24）And DC-DC power supply
（25）, the Power Management Unit（22）Respectively with the DC-DC power supply（25）, AC/DC power（21）, inversion
Device（24）And lithium battery（23）It is connected.
3. distribution network capacitance current test high speed tester according to claim 1, it is characterised in that：The babinet（9）With gold
Belong to shell, the operation panel（10）Also there is ground terminal（11）, the ground terminal（11）With the babinet（9）Metal shell
It is connected.
4. distribution network capacitance current test high speed tester according to claim 1, it is characterised in that：The display module（6）Bag
Capacitance touch liquid crystal display is included（12）, the capacitance touch liquid crystal display（12）Equipped with brightness regulation knob（13）
To adjust brightness.
5. distribution network capacitance current test high speed tester according to claim 1, it is characterised in that：The control module（1）Bag
Included digital signal processor, to realize in measurement process the mutual conversion between analog quantity and digital quantity, measured value calculate,
Result of calculation is exported and preserved.
6. distribution network capacitance current test high speed tester according to claim 1, it is characterised in that：The operation panel（10）Also
Include instrument switch（15）And power interface（20）.
7. distribution network capacitance current test high speed tester according to claim 6, it is characterised in that：The operation panel（10）Also
Include fuse（14）, the fuse（14）With the instrument switch（15）It is connected.
8. distribution network capacitance current test high speed tester according to claim 1, it is characterised in that：The print module（7）Bag
Printing end is included（16）To print data.
9. distribution network capacitance current test high speed tester according to claim 1, it is characterised in that：The usb interface module bag
USB interface is included（17）.
10. distribution network capacitance current test high speed tester according to claim 1, it is characterised in that：The operation panel（10）
Power supply indicator is further included（18）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721085360.1U CN207336616U (en) | 2017-08-28 | 2017-08-28 | A kind of distribution network capacitance current test high speed tester |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721085360.1U CN207336616U (en) | 2017-08-28 | 2017-08-28 | A kind of distribution network capacitance current test high speed tester |
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| Publication Number | Publication Date |
|---|---|
| CN207336616U true CN207336616U (en) | 2018-05-08 |
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ID=62370651
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110749766A (en) * | 2019-10-29 | 2020-02-04 | 徐州和纬信电科技有限公司 | Capacitance current tester and measuring method thereof |
-
2017
- 2017-08-28 CN CN201721085360.1U patent/CN207336616U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110749766A (en) * | 2019-10-29 | 2020-02-04 | 徐州和纬信电科技有限公司 | Capacitance current tester and measuring method thereof |
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