CN205880062U - Portable DC power supply return circuit capacitance to ground tester - Google Patents
Portable DC power supply return circuit capacitance to ground tester Download PDFInfo
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- CN205880062U CN205880062U CN201620728020.5U CN201620728020U CN205880062U CN 205880062 U CN205880062 U CN 205880062U CN 201620728020 U CN201620728020 U CN 201620728020U CN 205880062 U CN205880062 U CN 205880062U
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Abstract
The utility model provides a portable DC power supply return circuit capacitance to ground tester, includes the DC power supply return circuit that ground clamp, earth connection, test wire, test host computer, current clamp, quilt were surveyed, current clamp signal input interface, signal amplification module, low -frequency signal generator, signal synchronization output module, signal source power amplifier, signal source output interface, signal synchronization processing module, rectifier module, signal filtering module, AD converter, working power supply module, CPU, signal input 0, display, casing, signal feed -in wire, this device simple structure, the integrated level is high, has characteristics such as small, light in weight, convenient to carry, and it is too big to know transformer substation's DC power supply capacitance to ground value to power operating person, and it has very strong practicality to move hidden danger by mistake to get rid of relay protection equipment, suitably each transformer substation's test.
Description
Technical field
The invention belongs to power system power transmission and transforming equipment subtest equipment, particularly relate to a kind of test power system and become
The equipment of electric station DC electric power loop direct-to-ground capacitance value.
Background technology
Transforming plant DC power-supply system is to provide the one of working power for relay protection device, automation equipment communication apparatus
Planting electric supply equipment, running voltage is usually 220V, 110V, 48V electric pressure, and DC source is isolated neutral system and has
The advantages such as uninterrupted power supply, fan-out capability are strong, short circuit current is big, highly reliable.Electrical substation field devices is widely used, and is formed and divides
The features such as cloth is wide, duplexure is many, feeder line structure is complicated, wire length, its supply network wire over the ground between the most naturally
Define distribution capacity.DC loop electric capacity over the ground in addition to the distribution capacity that wire is formed over the ground, the most protected equipment I EM
The filter capacitor that the needs of reliability are added.Relevant document report shows, transforming plant DC power supply maximum capacitor over the ground
Up to more than 500uF.Transformer station's direct-to-ground capacitance is for DC source, because electric capacity is the characteristic that stopping direct current leads to exchange, to direct current
Power supply reliability does not produce any problem.Having considerable influence for whole protective loop, its capacitance is excessive to continuing
Electric protection equipment correct operation will produce certain hazardness.Have been reported that in the accident showing protective relaying maloperation, have
DC capacitor causes over the ground, usually has because of straight-flow system one point earth, and direct-to-ground capacitance electric discharge has caused relay protection device malfunction.
So power system requirements DC power system not loop service is exactly to reduce direct current direct-to-ground capacitance value to cross taked measure
One of.Individual branches loop power supply is used to control outside DC source direct-to-ground capacitance value.This direct-to-ground capacitance value is the most domestic also
There is no special test equipment.Being supportted the DC source direct-to-ground capacitance value held at ordinary times is all to use simulation charging method to calculate
, after may often be such that power system occurs protection equipment malfunction to make.Simulation discharge and recharge is used to calculate ground capacitance of DC system value.
Owing to DC source is the power-supply device of earth-free long-term power supply, conventional capacitance measuring tester also cannot be accurately to unidirectional current
Source direct-to-ground capacitance value measures.So, develop a kind of direct-to-ground capacitance test being appropriate to the test of transforming plant DC power-supply system
Instrument, understands transforming plant DC power supply direct-to-ground capacitance value for work about electric power person excessive, gets rid of relay protection device malfunction hidden danger and is
There is the strongest practicality.
Summary of the invention
The present invention be to provide a kind of be applied to power system transformer substation DC source direct-to-ground capacitance value test one portable
Formula equipment, it is achieved measure DC source each loop direct-to-ground capacitance value, is suitable for for the different DC source of different electric pressures
System, is appropriate to various application in substations.
The technical solution used in the present invention:
A kind of Portable DC mains loop direct-to-ground capacitance tester, it is characterised in that: include earth clip, earth lead,
Test lead, test main frame, current clamp, tested DC power supply circuit；Test main frame connects with earth lead, and earth lead is by connecing
Ground folder connects with the earth, and test main frame connects with test lead, the other end of test lead and tested DC power supply circuit phase
Connecing, current clamp clamps to be measured on DC loop on tested DC power supply circuit, tests main frame automatic test loop direct-to-ground capacitance
Value.
Described a kind of Portable DC mains loop direct-to-ground capacitance tester, is further characterized in that: test main frame includes
Current clamp signal input interface, signal amplification module, low frequency signal generator, signal synchronous output module, signal source power amplifier, letter
Number source output interface, signal synchronous processing module, rectification module, signal filtering module, A/D converter, working power module,
CPU, memory cell, display, casing, signal feed-in wire form；Current clamp signal input in test main frame and signal
Amplification module connects；Low frequency signal generator connects with signal synchronous output module；Low frequency signal generator and signal source power amplifier
Connecting, signal source power amplifier connects with signal source output interface；Signal source output interface is received tested by signal feed-in wire
DC power supply circuit；Current clamp is clipped on tested DC power supply circuit, measures the low frequency signal that low frequency signal generator occurs
The tank capacitance electric current produced；Signal amplification module connects with signal synchronous processing module；Signal synchronous output module and signal
Synchronous processing module phase also connects；Synchronizing signal processing module connects with rectification module；Rectification module connects with signal filtering module；
Signal filtering module connects with A/D converter；A/D converter connects with CPU；CPU connects with display；Signal source CPU with deposit
Storage unit connects；Working power module output station and each unit module phase also connect；Signal amplification module, signal synchronization process mould
Block, rectification module, signal filtering module, A/D converter, working power module, CPU memory cell, display are all installed on machine
In shell, casing is externally provided with: signal output interface, greatly interface, current clamp signal input.
1, apparatus structure is simple, and integrated level is high, and sampling precision is high, and the range of linearity is wide.
2, volume is little, lightweight, easy to carry, and suitable each transformer station tests.
3, device wiring is simple, tests safety.
Accompanying drawing explanation
Fig. 1 present configuration block diagram.
Fig. 2 apparatus of the present invention structured flowchart.
Drawing reference numeral explanation
(1) earth clip；(2) earth lead；(3) test lead；(4) test main frame；(5) current clamp；(6)
Tested DC power supply circuit.
(101) current clamp signal input interface；(102) signal amplification module；(103) low frequency signal generator；
(104) signal synchronous output module；(105) signal source power amplifier；(106) signal source output interface；(107) signal
Synchronous processing module；(108) rectification module；(109) signal filtering module；(110) A/D converter, (111)
CPU；(112)--memory cell；(113) display；(114) working power module；(115) casing；(116) signal
Feed-in wire.
Detailed description of the invention
As it is shown in figure 1, the present invention is to provide one is applied to the test of power system transformer substation DC source direct-to-ground capacitance value
A kind of portable set, it is achieved measure DC source each loop direct-to-ground capacitance value.Can be applicable to different electric pressure different
DC power system, the present invention is to provide a kind of one being applied to the test of power system transformer substation DC source direct-to-ground capacitance value
Portable set, it is achieved measure DC source each loop direct-to-ground capacitance value.Can be applicable to the unidirectional current that different electric pressure is different
Origin system, is appropriate to Mobile solution test between each transformer station.Present invention comprises: earth clip (1), earth lead (2), test are led
Line (3), test main frame (4), current clamp (5), tested DC power supply circuit (6)；Test main frame (4) connects with earth lead (2),
Earth lead (2) is connected with the earth by earth clip (1), tests main frame (4) and connects with test lead (3), test lead (3) another
One end connects with tested DC power supply circuit (6), and current clamp (5) clamps measures direct current on tested DC power supply circuit (6)
On loop, test main frame (4) test DC power supply circuit direct-to-ground capacitance value automatically.There is volume little, lightweight, easy to carry,
The measurement time is short.
As in figure 2 it is shown, test main frame (4) is by current clamp signal input interface (101), signal amplification module (102), low frequency
Signal generator (103), signal synchronous output module (104), signal source power amplifier (105), signal source output interface (106), letter
Number synchronous processing module (107), rectification module (108), signal filtering module (109), A/D converter (110), CPU (111),
Memory cell (112), display (113), working power module (114), casing (115), signal feed-in wire (116) composition is surveyed
Current clamp signal input interface (101) in examination main frame (4) connects with signal amplification module (102)；Low frequency signal generator
(103) connect with signal synchronous output module (107)；Low frequency signal generator (103) connects with signal source power amplifier (105), letter
Number source power amplifier (105) connects with signal source output interface (106)；Signal source output interface (106) passes through signal feed-in wire
(116) tested DC power supply circuit (6) is received；Current clamp (5) is clipped on tested DC power supply circuit (6), measures low frequency
The tank capacitance electric current that the low frequency signal that signal generator (103) occurs produces；Signal amplification module (102) place synchronization with signal
Reason module (107) connects；Signal synchronous output module (104) mutually and connects with signal synchronous processing module (107)；At synchronizing signal
Reason module (107) connects with rectification module (108)；Rectification module (108) connects with signal filtering module (109)；Signal filtering
Module (109) connects (110) with A/D converter；A/D converter (110) connects with CPU (111)；CPU (111) and display
(113) connect；Signal source CPU (111) connects with memory cell (112)；Working power module (114) output station and each unit mould
Block phase also connects；Signal amplification module (102), signal synchronous processing module (107), rectification module (108), signal filtering module
(109), A/D converter (110), working power module (114), CPU (111), memory cell (112), display (113) are all pacified
Being loaded in casing (115), casing (115) case surface is provided with: signal output interface, greatly interface, current clamp signal input.
Connecting relevant wire during use the most permissible, used time several interface lead need not couple, conveniently, safely, volume little.
Earth clip (1) test clip uses the small-sized blade of a sword fish folder that ground connection is special.The earth terminal or the shell that are sandwiched in direct current cabinet are to protect
Demonstrate,prove signal ground end ground connection.
Earth lead (2) is used for the wire connecting the earth with test main frame (4), uses 1.5 squares lead, black.One company
Earth clip (1), other end connects with test main frame (4), conductor length about 1.5 meters.
Test lead (3) is between connecting test main frame (4) and tested DC power supply circuit (6).Use black and red
The wire that color is 1.5 squares, black connects with DC power cathode, and redness connects with DC power anode.
Current clamp (5) is used for low-frequency singalling current of sampling.Test main frame (4) during test and DC power system is injected one
Low frequency signal, loop direct-to-ground capacitance device just has electric current and flows through.The capacitance current in this loop is flow through in current clamp (5) test.
Test main frame (4) is by current clamp signal input interface (101), signal amplification module (102), low frequency signal generator
(103), signal synchronous output module (104), signal source power amplifier (105), signal source output interface (106), signal synchronization process
Module (107), rectification module (108), signal filtering module (109), A/D converter (110), CPU (111), memory cell
(112), display (113), working power module (114), casing (115), signal feed-in wire (116) composition；Casing (115)
Inside is provided with signal, and casing (115) housing sets current clamp signal output interface (101), signal source output interface (106).
Current clamp signal input interface (101) is installed on casing (115) above, uses aviation socket, current clamp (5) defeated
Going out end and make boat head plug, correspondence inserts on this aviation socket, can be opening when not using, it is not necessary to long-term band wire.
The capacitance current signal that current clamp (5) sensing is returned mainly is amplified processing by signal amplification module (102),
The voltage output reaching 0-5V is delivered to next stage circuit and is processed.
Low frequency signal generator (103) produces the low frequency sine wave signal of a 0.1HZ, and two-way exports, and a road is as same
Step signal, it is main signal that subordinate loop is delivered to after amplifying in another road.
Signal synchronous output module (104) will make a square wave letter synchronized in the signal of low frequency signal generator (103)
Number, give signal synchronous processing module (107) and do synchronization process.Ensure that the Low Frequency Sine Signals measurement of 0.1HZ returns to have one
Individual phase bit comparison, removes the current in resistance property that insulation resistance produces.
The low frequency sine wave signal of the 0.1HZ that low frequency signal generator (103) produces is carried out by signal source power amplifier (105)
Signal amplifies, and arrives greatly the power of 5V, 3W, it is ensured that the generation of capacitance current.
Signal source output interface (106) is mounted to test on the shell of main frame (4), is received tested by private jack
On DC power supply circuit (6), the signal of signal source low frequency 0.1HZ is made to be fed on tested DC power supply circuit (6).
Signal synchronous processing module (107) is after low frequency signal source is fed to tested DC power supply circuit, by current clamp
(5) sensing adopts, and this current clamp (5) can sense that current in resistance property, the electric power signal of 50HZ interference need synchronizing signal to carry out
Process.Ensure that the signal of 0.1HZ could be by removing the signal of other frequencies, it is ensured that the accuracy of measurement.
Low frequency signal is processed by rectification module (108) by signal amplification module (102) signal synchronous processing module (107)
After pure capacitance current signal carry out rectification, make to be output as direct current signal and deliver to next stage.
Signal after rectification module (108) rectification is carried out interference by signal filtering module (109) so that it is signal stabilization.
This analogue signal is converted into digital signal by A/D converter (110), delivers to next stage CPU (111) and goes to calculate, should
A/D converter (110) uses AD14433, the transducer of 12.
CPU (111) is the main process computing unit of this monitoring, and model 32V1674. is produced by TL company of the U.S., is 32
Position patrilineal line of descent with only one son in each generation machine.
Memory cell (112) preserves data, can be the data use counting and taking measurement, use model TL7321, by U.S. TL
Company produces.
Display (113) uses the liquid crystal display that Beijing Di Wen company produces, and model is DW320240T.
Working power module (114) is responsible for the work of whole instrument, is mainly turned by the 220V voltage of DC power supply circuit
Change the power supply of+5V ,-5V ,+12V ,-12V into, give an element circuit job, whole power 20W.
Each unit circuit is arranged in casing (115) by casing (115), and casing (115) uses portable casing (115),
A size of 220*150*80mm.
Signal feed-in wire (116) uses the copper cash of 2 1.5 squares of bold and unconstrained rice of core, dark red each one, is produced by low frequency signal source
Low frequency signal be fed to tested DC power supply circuit (6).
Claims (2)
1. a Portable DC mains loop direct-to-ground capacitance tester, it is characterised in that: include earth clip, earth lead, test
Wire, test main frame, current clamp, tested DC power supply circuit；Test main frame connects with earth lead, and earth lead passes through earth clip
Connecting with the earth, test main frame connects with test lead, and the other end of test lead connects with tested DC power supply circuit, electricity
Stream clamps to be measured on DC loop on tested DC power supply circuit, main frame automatic test loop direct-to-ground capacitance value.
A kind of Portable DC mains loop the most according to claim 1 direct-to-ground capacitance tester, is characterized in that: test is main
Machine includes current clamp signal input interface, signal amplification module, low frequency signal generator, signal synchronous output module, signal source
Power amplifier, signal source output interface, signal synchronous processing module, rectification module, signal filtering module, A/D converter, working power
Module, CPU, memory cell, display, casing, signal feed-in wire form；Signal amplification module, signal synchronous processing module,
Rectification module, signal filtering module, A/D converter, working power module, CPU memory cell, display are all installed on casing
In, casing is externally provided with: signal output interface, greatly interface, current clamp signal input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620728020.5U CN205880062U (en) | 2016-07-08 | 2016-07-08 | Portable DC power supply return circuit capacitance to ground tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620728020.5U CN205880062U (en) | 2016-07-08 | 2016-07-08 | Portable DC power supply return circuit capacitance to ground tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205880062U true CN205880062U (en) | 2017-01-11 |
Family
ID=57695548
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620728020.5U Expired - Fee Related CN205880062U (en) | 2016-07-08 | 2016-07-08 | Portable DC power supply return circuit capacitance to ground tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205880062U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106896275A (en) * | 2017-02-13 | 2017-06-27 | 国网上海市电力公司 | A kind of cable distributed capacitance Risk-warning control system |
| CN110824258A (en) * | 2019-12-05 | 2020-02-21 | 广东电网有限责任公司 | Capacitance test analytical equipment |
| CN111624408A (en) * | 2020-05-27 | 2020-09-04 | 南京信息工程大学 | Power line ground capacitance real-time measurement method based on symbiotic multi-functional calculation |
-
2016
- 2016-07-08 CN CN201620728020.5U patent/CN205880062U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106896275A (en) * | 2017-02-13 | 2017-06-27 | 国网上海市电力公司 | A kind of cable distributed capacitance Risk-warning control system |
| CN110824258A (en) * | 2019-12-05 | 2020-02-21 | 广东电网有限责任公司 | Capacitance test analytical equipment |
| CN111624408A (en) * | 2020-05-27 | 2020-09-04 | 南京信息工程大学 | Power line ground capacitance real-time measurement method based on symbiotic multi-functional calculation |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 325800 No. 666 Shanhai Road, Cangnan County Industrial Park, Wenzhou, Zhejiang Patentee after: Zhejiang Branch electronic Limited by Share Ltd Address before: 325800 No. 666 Shanhai Road, Cangnan County Industrial Park, Wenzhou, Zhejiang Patentee before: ZHEJIANG KE CHANG ELECTRONIC CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170111 Termination date: 20190708 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |