CN207908603U - A kind of circuit artificial earthing short-circuit test overall process current detecting system - Google Patents
A kind of circuit artificial earthing short-circuit test overall process current detecting system Download PDFInfo
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- CN207908603U CN207908603U CN201721314705.6U CN201721314705U CN207908603U CN 207908603 U CN207908603 U CN 207908603U CN 201721314705 U CN201721314705 U CN 201721314705U CN 207908603 U CN207908603 U CN 207908603U
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Abstract
The utility model discloses a kind of circuit artificial earthing short-circuit test overall process current detecting system, including shaft tower A, shaft tower B, striking frame J, striking line D, earth short circuit current test probe F1, fibre-optic transmission system (FOTS) and data analysis system；The line conductor F for carrying out artificial earthing's short-circuit test is equipped between shaft tower A and shaft tower B；Striking frame J is fixed on conducting wire F；Striking one end line D is connect with striking frame J, and the other end is connect with the down conductor of extension bar tower A；Earth short circuit current test probe F1 is set on striking line D, for measuring the earth short circuit current on striking line D；The output end of earth short circuit current test probe F1 is connected by fibre-optic transmission system (FOTS) with data analysis system.Overall process test of the line-to-ground short circuit current from power frequency 50Hz to transient state may be implemented in the utility model; it can be used for studying mechanism of production, the process of ground short circuit electric arc; to study the method and the measure that reduce its harm, the development of more reliable line protective devices is realized.
Description
Technical field
The utility model belongs to High-Voltage Test Technology field, more particularly to a kind of full mistake of circuit artificial earthing short-circuit test
Journey current detecting system.
Background technology
With the continuous expansion of China's power grid scale, the probability that earth fault occurs in circuit gradually rises, to improve system
The reliability of power supply, China is super, UHV transmission line much uses individual event reclosing, the time of coincidence to depend primarily on latent confession
Current duration and system stability requirement.
There are many factor for influencing pincers worker current duration, and the duration was both with the electric parameter of transmission line of electricity, circuit
The power etc. of no installing highly resistance, the capacity for installing highly resistance and small reactor on neutral point numerical value, circuit conveying, it is especially idle related,
Also related with the environmental factors such as wind speed, air humidity.Currently, simulation calculation being capable of accurate calculating secondary arc current and recovery electricity
Pressure amplitude value, but can not also simulate influence of the environmental factor changed at random to the secondary arc current arc time.Therefore, operation power list
The practical circuit secondary arc current amplitude that measures is tested by artificial single phase grounding test during project of transmitting and converting electricity system debug and is continued in position
Time and restore voltage value, both can be the suitable protection definite value of setting and reclosure time foundation be provided and examine circuit after
Electric protection, and the power transmission and transformation system feature of transmission line of electricity can be comprehensively grasped, there is important meaning for line security stable operation
Justice.
For distribution line, since the planning of part power distribution network, design and construction are lack of standardization, technical equipment is not high,
Relay protection and automatic device are not perfect, and all kinds of personnel (including consumer electrical operating personnel) awareness of safety are thin, safety in production
The fundamentals of management is weak, and there are the very risky of maloperation and user side foldback electricity, therefore part distribution line will also do and manually connect
Ground short circuit is tested.The main purpose of experiment is the understanding that forced working personnel are grounded importance to strictly installing, and simulates work
Personnel reliably connect with unreliable installing three-phase shortcircuit when working on power failure distribution line in job site adjacent power side lever tower
After ground wire, when mains side is surprisingly sent a telegram here in the course of work, whether staff can be injured by getting an electric shock, i.e., by alternate to circuit
Voltage, phase-to-ground voltage and step voltage parameter carry out test analysis, security risk of the evaluation work personnel when surprisingly sending a telegram here.
Electric arc in artificial earthing's short-circuit test is extremely complex electromagnetic transient, since line-to-ground has distribution
Capacitance, therefore electromagnetic pulse of the frequency at million grades or so will be will produce, to generate transient overvoltage, these electromagnetic interferences have can
On-Line Monitor Device can be caused to damage or protective relaying device tripping, malfunction etc., thus artificial earthing's short-circuit test in addition to
It obtains except secondary arc current information, more it should be recognized that the overall process that electric arc generates, to study the mechanism of electric arc generation, and is studied
Reduce arc duration, intensity and its method to the harm of the devices such as relay protection and measure.Artificial earthing's short circuit is tried at present
It tests and only acquires its high-frequency process, its electric discharge overall process from 50Hz to transient state is not acquired, circuit is ground to lose
Study carefully, improved significant data, it is therefore necessary to make the design method and test method of overall process electric current as early as possible.
Currently, transmission line of electricity artificial earthing's short-circuit test method is：Using the ejector based on spring energy-storage principle, defeated
Electric line downward vertical hangs striking frame, is emitted striking line to striking frame using ejection bullet, forms single-line to ground fault, short
Road electric current is applied by the tower grounding body diffusing near short dot, this method in certain UHV Transmission Engineerings, but
Enter ground short circuit electric current, especially alternating current circuit single-line to ground fault for kilo-ampere magnitude in each experiment, easily leads to short dot
Ground Electric Potential Rise and step voltage are more than safety limit, to field test personnel component personal safety risk.
Utility model content
The purpose of this utility model is to provide a kind of circuit artificial earthing short-circuit test overall process current detecting system, with
Solve above-mentioned technical problem.
To achieve the goals above, the utility model adopts the following technical solution：
A kind of circuit artificial earthing short-circuit test overall process current detecting system, including shaft tower A, shaft tower B, striking frame J, draw
Camber line D, earth short circuit current test probe F1, fibre-optic transmission system (FOTS) and data analysis system；
The line conductor F for carrying out artificial earthing's short-circuit test is equipped between shaft tower A and shaft tower B；
Striking frame J is fixed on conducting wire F；Striking one end line D is connect with striking frame J, the grounding lead of the other end and extension bar tower A
Offline connection；Earth short circuit current test probe F1 is set on striking line D, for measuring the electricity of the ground short circuit on striking line D
Stream；
The output end of earth short circuit current test probe F1 is connected by fibre-optic transmission system (FOTS) with data analysis system.
Further, earth short circuit current test probe F1 includes the Rogowski coil CCC at center and winds around Roche
The shielded layer BBB of the outer surfaces coil CCC；Shielded layer AAA is enclosed with outside shielded layer BBB.
Further, shielded layer BBB uses seamless full-shield hardware cloth.
Further, further include short for carrying out the ground connection of field-checking before testing to ground short circuit current probe F1
Road electric current field calibration system I；Earth short circuit current field calibration system I includes：Frequency point selection device AA1, high current hair
Raw device AA2, electric current GSS Gear Select Switch AA3 and outlet BB；Strong current generator AA2 rate of connections point selection device AA1 and electricity
Flow GSS Gear Select Switch AA3, the output end connection outlet BB of strong current generator AA2.
Further, the output end of earth short circuit current test probe F1 is transmitted by broadband integrator F2 connection optical fiber
System；
Broadband integrator F2 includes：
BNC connector J1, center pin connect the output of current probe F1 signals, i.e. signal inputs VinAnd 50
One end of one end and 12k Ω resistance R2 of Ω resistance R1, remaining 4 fixing pin ground connection；The other end of R1 is grounded；
BNC connector J2, the signal after pin connection in center integrates export Vout, i.e. one end of 1uF capacitances C7 and 1M Ω electricity
The one end R6 is hindered, remaining 4 fixing pin ground connection；The other end of R6 is grounded；
The connector socket J3 of 3 pins, wherein 1 termination -6V power supplys, while connecting the 4th pin and 0.1uF electricity of chip JP1
Solve the negative terminal of capacitance C4, the positive ending grounding of C4；In addition, the anode of pin connection 6V voltage-stabiliser tubes D1, the negativing ending grounding of D1；2 ends
It is directly grounded；3 termination+6V power supplys, while the anode of the 7th pin and 0.1uF electrolytic capacitors C6 of chip JP1 is connected, C6's is negative
End ground connection；In addition, the negative terminal of pin connection 6V voltage-stabiliser tubes D2, the positive ending grounding of D2；
High speed amplifier chip JP1,1 end are hanging；2 ends are amplifier negative input end, the one end connection 8k Ω resistance R4,20M Ω electricity
Hinder the one end R5 and the one end 47nF capacitance C3；Its 3 end is the positive input terminal of amplifier, the connection 12k Ω resistance R2 other ends, 27nF capacitances
The one end C1 and the one end 0.01uF capacitance C2；Its 4 end is negative supply input terminal；Its 5 end is chip compensation end, connection 30pF capacitances C5
One end；Its 6 end is amplifier output end, and the connection 20M Ω resistance R5 other ends, the 47nF capacitance C3 other ends, 30pF capacitances C5 are another
One end, the anode of 0.1uF capacitances C6 and the 1uF capacitance C7 other ends；Its 7 end is positive supply input terminal, connection 0.1uF capacitances C6's
Anode；Its 8 end is hanging；
1uF capacitance C7 and 1M Ω resistance R6 constitutes high-pass filter；
The C1 other ends connect one end of 50 Ω resistance R3, the other end ground connection of R3 and R4 with the C2 other ends；
R4, R5 and C3 constitute active integrator；
R2, R3, C1 and C2 constitute passive integrator.
Further, fibre-optic transmission system (FOTS) includes：Sequentially connected electrical to optical converter G1, optical fiber G3 and electrical to optical converter
G2；The signal output end V of the input terminal connection broadband integrator F2 of electrical to optical converter G1out；The output end of electrical to optical converter G2
Connect data analysis system H.
Compared with the existing technology, the utility model has the advantages that：
Overall process test of the line-to-ground short circuit current from power frequency 50Hz to transient state may be implemented in the utility model, can be used for
Mechanism of production, the process for studying ground short circuit electric arc realize more reliable line to study the method and the measure that reduce its harm
The development of line protection device is ground for defeated at the scene, electric arc during distribution line artificial earthing's short-circuit test total current process
Study carefully and portable, effective measuring system is provided.The utility model can be applied electric system is defeated, distribution line artificial earthing is short
Road test carries out overall process short circuit current test during testing, and applies also for railway, military affairs etc. and needs to carry out transmission line of electricity ground connection
The field of short-circuit test.
Description of the drawings
Fig. 1 is circuit artificial earthing's short-circuit test overall process current detecting system schematic diagram；
Fig. 2 is earth short circuit current field calibration system schematic diagram；
Fig. 3 is earth short circuit current test probe schematic diagram；
Fig. 4 is the circuit diagram of broadband integrator.
Specific implementation mode
Refering to Figure 1, a kind of circuit artificial earthing short-circuit test overall process current detecting system of the utility model, packet
Include shaft tower A, shaft tower B, striking frame J, striking line D, earth short circuit current field calibration system I, earth short circuit current test probe
F1, fibre-optic transmission system (FOTS) and data analysis system.
Wherein：
A、B：To carry out the two-stage shaft tower of artificial earthing's short-circuit test in circuit；
F：For the line conductor for carrying out artificial earthing's short-circuit test between shaft tower A, B；
J：For striking frame, the high-pressure side in being used to test；Striking frame J is fixed on conducting wire F；
E：For electric arc, the arc process during testing, electric current is substantially in kilo-ampere magnitude；
D：For striking line, the down conductor of extension bar tower A, in experiment " " end；When experiment, striking line one end passes through
Emitter is connect with striking frame J, and the other end is connect with the down conductor of extension bar tower A；
I：For earth short circuit current field calibration system.Since live artificial earthing's short-circuit test may be to route protection
Device damages, it is impossible to do many times, valid data must be measured in limited experimentation number, therefore the experiment is to test
The reliability requirement of system is very high.Due to testing ground environment complexity, test system link circuit reliability is tested
System for field is calibrated.The transient process that current measurement involved by the utility model is 50Hz to MHz grades, and earth short circuit current one
As be tens kA ranks, broadband, the test calibration device of high current are difficult to realize, therefore using the test of characteristic spectra point
Method selects the sinusoidal electricity of the Frequency points such as 50Hz, 1kHz, 10kHz, 100kHz, 500kHz, 700kHz, 1MHz, 1.5MHz output
Stream selects the high current calibration equipment of phase induced current output according to the live earth short circuit current value of calculating.It is illustrated in figure 2
The schematic diagram of earth short circuit current field calibration system.
Wherein, AA1 is Frequency point selection device, and Frequency point is selected according to test requirements document；AA2 is strong current generator,
Output is selected according to actual field earth short circuit current calculated value；AA3 is electric current GSS Gear Select Switch, and output current is adjusted
Amplitude；BB is the outlet of output current, for connecting current probe.Strong current generator AA2 rate of connections points selection dress
Set the outlet BB of the output end connection output current of AA1 and electric current GSS Gear Select Switch AA3, strong current generator AA2；It is grounded short
Road current probe F1 is sleeved on outlet BB, for detecting the output current for BB occur；Earth short circuit current test probe F1
Optical fiber transmission and data analysis system are connected by broadband integrator；Compare short circuit current to earth by detected value and setting value
Test probe F1 carries out field-checking.
Before artificial earthing's short-circuit test starts, after live current measurement system connects, current measurement probe set
F1 is tested on the outlet BB of earth short circuit current field calibration system I, and error between matching measurement value and actual value is tested
Demonstrate,prove the reliability of current measurement system.After having verified, current probe is sleeved on striking line D, then is proceeded by artificial
Ground short circuit is tested.
F1：Current probe, using broadband Rogowski coil current sensor, the coil is as shown in Figure 3.
Since artificial earthing's short-circuit test arc process is violent, electromagnetic interference is very serious, it is therefore necessary in ground short circuit
Shielded layer BBB is added in current probe, which must use seamless full-shield hardware cloth, wind around Roche line
The outer surfaces CCC are enclosed, shielded layer AAA are wrapped up outside shielded layer BBB, so that coil is to external shield.
F2：Broadband integrator；
The integrator measurement range is 50Hz-2MHz, and structure is as shown in Figure 4.Wherein capacitance C4 and C6 is electrolytic capacitor,
Remaining is ceramic disc capacitor, and resistance all selects the straight cutting resistance of 0.25W.
Broadband integrator F2 includes：
J1：For BNC connector, center pin connects the output of current probe F1 signals, i.e. signal inputs Vin, and
50 Ω resistance R1 and 12k Ω resistance R2, remaining 4 fixing pin ground connection.
J2：For BNC connector, the signal after pin connection in center integrates exports Vout, i.e. 1uF capacitances C7 and 1M Ω resistance
R6, remaining 4 fixing pin ground connection.
J3：For the connector socket of 3 pins, wherein 1 termination -6V power supplys, while connecting the 4th pin and 0.1uF of chip JP1
The negative terminal of electrolytic capacitor C4, the positive ending grounding of C4；In addition, the anode of pin connection 6V voltage-stabiliser tubes D1, the negativing ending grounding of D1.2
End is directly grounded.3 termination+6V power supplys, while the anode of the 7th pin and 0.1uF electrolytic capacitors C6 of chip JP1 is connected, C6's
Negativing ending grounding；In addition, the negative terminal of pin connection 6V voltage-stabiliser tubes D2, the positive ending grounding of D2.
D1：6V voltage-stabiliser tube P6KE6, anode connect 1 end of J3, negativing ending grounding, to protect the negative supply of chip JP1.
D2：6V voltage-stabiliser tube P6KE6, negative terminal connect 3 ends of J3, positive ending grounding, to protect the positive supply of chip JP1.
JP1：For high speed amplifier chip AD829, to carry out integral operation.Its 1 end is hanging.2 ends are amplifier negative input end,
8k Ω resistance R4,20M Ω resistance R5 and 47nF capacitance C3 are connected, integral operation is carried out.Its 3 end is the positive input terminal of amplifier, even
Meet 12k Ω resistance R2,27nF capacitance C1 and 0.01uF capacitances C2.Its 4 end is negative supply input terminal, connects 1 end of socket J3,
The negative terminal of 0.1uF capacitances C4.Its 5 end is chip compensation end, connection 30pF capacitances C5.Its 6 end is amplifier output end, connects 20M
Ω resistance R5,47nF capacitance C3,30pF capacitance C5,0.1uF capacitance C6 and 1uF capacitances C7.Its 7 end is positive supply input terminal, even
3 ends of combination hub J3, the anode of 0.1uF capacitances C6.Its 8 end is hanging.
1uF capacitance C7 and 1M Ω resistance R6 constitutes high-pass filter.6 ends of 829 chip JP1 of 1uF capacitances C7 connections, it is another
One end connects 1M Ω resistance R6, and connection signal output end Vout.The one end 1M Ω resistance R6 connects 1uF capacitances C7, another termination
Ground.
C6：Positive supply electrolytic capacitor filter, capacitance 10uF, make circuit board when close proximity to chip JP1 7 ends,
7 ends of its positive termination JP1, negativing ending grounding.
C4：Positive supply electrolytic capacitor filter, capacitance 10uF, make circuit board when close proximity to chip JP1 4 ends,
Its negative terminal connects 4 ends of JP1, positive ending grounding.
C5 is the compensating electric capacity of chip JP1, capacitance 30pF.5 ends of its 1 termination JP1, another termination JP1's is defeated
6 end of outlet.
R4, R5 and C3 constitute active integrator.The one end 8k Ω resistance R4 connects 50 Ω resistance R3, and is grounded, and the other end connects
Connect 2 ends of JP1.The one end 20M Ω resistance R5 connects 2 ends of JP1, and the other end connects 6 ends of JP1.The one end 47nF capacitance C3 connects
2 ends of JP1, the other end connect 6 ends of JP1.
R2, R3, C1 and C2 constitute passive integrator.Mono- termination signals of 12k Ω resistance R2 input VinAnd R1, another termination
3 ends of JP1.27nF capacitance C1 and 0.01uF capacitances C2 is in parallel, and one end connects 3 ends of JP1, and the other end connects 50 Ω resistance R3.
50 one end Ω resistance R3 are grounded, and the other end connects C1 and C2.
R1：To input build-out resistor, resistance value is 50 Ω.One terminates R2, other end ground connection.
Refering to Figure 1, fibre-optic transmission system (FOTS) includes：Sequentially connected electrical to optical converter G1, optical fiber G3 and electric light turn
Parallel operation G2；The signal output end V of the input terminal connection broadband integrator F2 of electrical to optical converter G1out；Electrical to optical converter G2's is defeated
Outlet connects data analysis system H.
Claims (4)
1. a kind of circuit artificial earthing short-circuit test overall process current detecting system, which is characterized in that including shaft tower A, shaft tower B,
Striking frame J, striking line D, earth short circuit current test probe F1, fibre-optic transmission system (FOTS) and data analysis system；
The line conductor F for carrying out artificial earthing's short-circuit test is equipped between shaft tower A and shaft tower B；
Striking frame J is fixed on conducting wire F；Striking one end line D is connect with striking frame J, the down conductor of the other end and extension bar tower A
Connection；Earth short circuit current test probe F1 is set on striking line D, for measuring the earth short circuit current on striking line D；
The output end of earth short circuit current test probe F1 is connected by fibre-optic transmission system (FOTS) with data analysis system；
Earth short circuit current test probe F1 includes the Rogowski coil CCC at center and winds around the outer surfaces Rogowski coil CCC
Shielded layer BBB；Shielded layer AAA is enclosed with outside shielded layer BBB；
Shielded layer BBB uses seamless full-shield hardware cloth.
2. a kind of circuit artificial earthing short-circuit test overall process current detecting system according to claim 1, feature exist
In further including the earth short circuit current field-checking for carrying out field-checking before testing to ground short circuit current probe F1
System I；Earth short circuit current field calibration system I includes：Frequency point selection device AA1, strong current generator AA2, current gear
Position selecting switch AA3 and outlet BB；Strong current generator AA2 rate of connections point selection device AA1 and electric current GSS Gear Select Switch
The outlet BB of the output end connection output current of AA3, strong current generator AA2.
3. a kind of circuit artificial earthing short-circuit test overall process current detecting system according to claim 1, feature exist
In the output end of earth short circuit current test probe F1 passes through broadband integrator F2 connection fibre-optic transmission system (FOTS)s；
Broadband integrator F2 includes：
BNC connector J1, center pin connect the output of current probe F1 signals, i.e. signal inputs VinAnd 50 Ω electricity
One end of one end and 12k Ω resistance R2 of R1 is hindered, remaining 4 fixing pin ground connection；The other end of R1 is grounded；
BNC connector J2, the signal after pin connection in center integrates export Vout, i.e. one end of 1uF capacitances C7 and 1M Ω resistance R6
One end, remaining 4 fixing pin ground connection；The other end of R6 is grounded；
The connector socket J3 of 3 pins, wherein 1 termination -6V power supplys, while connecting the 4th pin and 0.1uF electrolysis electricity of chip JP1
Hold the negative terminal of C4, the positive ending grounding of C4；In addition, the anode of pin connection 6V voltage-stabiliser tubes D1, the negativing ending grounding of D1；2 ends are direct
Ground connection；3 termination+6V power supplys, while the anode of the 7th pin and 0.1uF electrolytic capacitors C6 of chip JP1 is connected, the negative terminal of C6 connects
Ground；In addition, the negative terminal of pin connection 6V voltage-stabiliser tubes D2, the positive ending grounding of D2；
High speed amplifier chip JP1,1 end are hanging；2 ends are amplifier negative input end, the one end connection 8k Ω resistance R4,20M Ω resistance R5
One end and the one end 47nF capacitance C3；Its 3 end is the positive input terminal of amplifier, the connection 12k Ω resistance R2 other ends, 27nF capacitances C1 mono-
End and the one end 0.01uF capacitance C2；Its 4 end is negative supply input terminal；Its 5 end is chip compensation end, connects the one of 30pF capacitances C5
End；Its 6 end is amplifier output end, the connection 20M Ω resistance R5 other ends, the 47nF capacitance C3 other ends, the 30pF capacitance C5 other ends,
The anode and the 1uF capacitance C7 other ends of 0.1uF capacitances C6；Its 7 end is positive supply input terminal, the anode of connection 0.1uF capacitances C6；
Its 8 end is hanging；
1uF capacitance C7 and 1M Ω resistance R6 constitutes high-pass filter；
The C1 other ends connect one end of 50 Ω resistance R3, the other end ground connection of R3 and R4 with the C2 other ends；
R4, R5 and C3 constitute active integrator；
R2, R3, C1 and C2 constitute passive integrator.
4. a kind of circuit artificial earthing short-circuit test overall process current detecting system according to claim 3, feature exist
In fibre-optic transmission system (FOTS) includes：Sequentially connected electrical to optical converter G1, optical fiber G3 and electrical to optical converter G2；Electrical to optical converter G1
Input terminal connection broadband integrator F2 signal output end Vout；The output end connection data analysis system of electrical to optical converter G2
Unite H.
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| CN201721314705.6U CN207908603U (en) | 2017-10-12 | 2017-10-12 | A kind of circuit artificial earthing short-circuit test overall process current detecting system |
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| CN201721314705.6U CN207908603U (en) | 2017-10-12 | 2017-10-12 | A kind of circuit artificial earthing short-circuit test overall process current detecting system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109387750A (en) * | 2018-12-21 | 2019-02-26 | 云南电网有限责任公司电力科学研究院 | The ultra-high-tension power transmission line short circuit grounding striking pilot system and method for vertical lift |
| CN109406976A (en) * | 2018-12-21 | 2019-03-01 | 云南电网有限责任公司电力科学研究院 | A kind of ultra-high-tension power transmission line instantaneous short-circuit test device and method of unmanned plane driving |
| CN110514940A (en) * | 2019-09-27 | 2019-11-29 | 国网四川省电力公司电力科学研究院 | A kind of direct current grounding pole route arc extinction characteristic test apparatus and test method |
-
2017
- 2017-10-12 CN CN201721314705.6U patent/CN207908603U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109387750A (en) * | 2018-12-21 | 2019-02-26 | 云南电网有限责任公司电力科学研究院 | The ultra-high-tension power transmission line short circuit grounding striking pilot system and method for vertical lift |
| CN109406976A (en) * | 2018-12-21 | 2019-03-01 | 云南电网有限责任公司电力科学研究院 | A kind of ultra-high-tension power transmission line instantaneous short-circuit test device and method of unmanned plane driving |
| CN110514940A (en) * | 2019-09-27 | 2019-11-29 | 国网四川省电力公司电力科学研究院 | A kind of direct current grounding pole route arc extinction characteristic test apparatus and test method |
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