CN110441646A - A kind of GIL conducting rod connection evaluation system and method based on resistive potential difference ratio - Google Patents
A kind of GIL conducting rod connection evaluation system and method based on resistive potential difference ratio Download PDFInfo
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- CN110441646A CN110441646A CN201910784326.0A CN201910784326A CN110441646A CN 110441646 A CN110441646 A CN 110441646A CN 201910784326 A CN201910784326 A CN 201910784326A CN 110441646 A CN110441646 A CN 110441646A
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- gil
- conducting rod
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Abstract
The invention discloses a kind of GIL conducting rod connection evaluation system and method based on resistive potential difference ratio, system includes GIL conducting rod sample, GIL conducting rod sample includes having linkage section GIL conducting rod and connectionless section of GIL conducting rod by the way that contact is concatenated, there is the current terminal of linkage section GIL conducting rod to be sequentially connected current transformer, the current terminal of current source and connectionless section of GIL conducting rod, GIL conducting rod is also connected with potential difference test loop, the present invention can cause according to GIL conducting rod linkage section contact is bad along the conducting rod axially above variation of impedance, necessarily lead to the variation of linkage section potential difference, benchmark alternate standard AC impedance is used as using connectionless section of GIL conducting rod, to have linkage section and the resistive potential difference ratio of connectionless section surface as evaluation parameter, realize that GIL guide rod connects matter Measure the evaluation of (state).This method has many advantages, such as the influence and strong antijamming capability of not tested person environment temperature.
Description
Technical field
The invention belongs to conducting rod quality evaluation fields, and in particular to a kind of GIL conducting rod based on resistive potential difference ratio
Connect evaluation system and method.
Background technique:
Gas-insulated transmission line (gas-insulated transmission lines, GIL) is using metal shell
Close conducting rod, compressed gas (such as SF6、SF6/N2Mixed gas etc.) it insulate, the electric energy transmission that shell and conducting rod are coaxially arranged
Equipment, have many advantages, such as transmission capacity is big, specific loss is low, it is affected by environment it is small, operational reliability is high, land occupation is few, with electricity
Power industrial expansion, people pay attention to the development of GIL equipment increasingly.
GIL conducting rod is coupled using slider inserting mode, and Interposer contact latches grafting by internal, and structure of contact terminal is permitted
Perhaps certain axial stretching and angular deflection.In electrical engineering field, traditional GIL conducting rod quality of connection evaluation is with direct current
Resistance is foundation, and the test electric current of D.C. resistance is small, and flows through along GIL conducting rod sectional uniform, and GIL conducting rod when working normally
Electric current be exchange, current amplitude is big, since the influence of kelvin effect is in GIL conducting rod section and junction current distribution is uneven
It is even, while the factors such as temperature between the contact locked position of conducting rod connection, dynamics and contact and lock all will lead to and contact
The variation of resistance.Therefore, D.C. resistance cannot reflect GIL conducting rod quality of connection comprehensively, and it is conductive to need to establish reflection GIL comprehensively
The new method of bar quality of connection evaluation.
Comparison method is the method that large size conductor resistance test generallys use, and this method is tested by measuring resistance calibration
Resistance, and measuring resistance (resistance is primarily due to without suitable measuring resistance (impedance) under AC great current test condition
It is anti-) self-heating and test condition and environment temperature etc. influence the precision of resistance.The invention proposes one kind to be based on resistive electricity
The new method of the GIL conducting rod quality of connection evaluation of potential difference ratio, solves AC equivalent resistance and does not have under the conditions of high-current test
The technical problem for thering is suitable measuring resistance (impedance) to face, and overcome the influence of test temperature, realize the connection of GIL conducting rod
The accurate evaluation of quality.
Summary of the invention
The purpose of the present invention is to provide a kind of, and the GIL conducting rod based on resistive potential difference ratio connects evaluation system and side
Method does not have lacking for suitable measuring resistance to solve AC equivalent resistance caused by the prior art under the conditions of high-current test
It falls into.
The invention is realized by the following technical scheme:
In a first aspect, providing a kind of GIL conducting rod connection evaluation system based on resistive potential difference ratio, the system packet
Include GIL conducting rod sample, the GIL conducting rod sample includes having linkage section GIL conducting rod and connectionless by the way that contact is concatenated
Section GIL conducting rod, the current terminal for having linkage section GIL conducting rod are sequentially connected current transformer, current source and connectionless section
The current terminal of GIL conducting rod, the GIL conducting rod are also connected with potential difference test loop, connection and electricity on the test loop
The precision resistance of the output end connection of current transformer.
With reference to first aspect, further, the test loop includes that the locking phase connecting with the GIL conducting rod sample is put
Big device, there are four probe, one of probes to have linkage section GIL conducting rod to connect with described for the lock-in amplifier, excess-three
A probe is connect with connectionless section of GIL conducting rod.
With reference to first aspect, further, the spacing of the potential end of the probe and current terminal is greater than 3 times of the GIL
The diameter of conducting rod sample.
With reference to first aspect, further, the flexibility connecting with temperature control box is socketed on the outside of the GIL conducting rod sample
Electric heating cover.
Second aspect provides a kind of GIL conducting rod quality of connection evaluation method based on the resistive potential difference ratio in surface, institute
The method of stating includes the following steps:
It is inductance L by the circuit equivalent for having linkage section GIL conducting rodxWith resistance RxConcatenated circuit 1；
It is inductance L by the circuit equivalent of connectionless section of GIL conducting rodsWith resistance RsConcatenated circuit 2；
Electrical parameter after circuit 1 and circuit 2 are connected in measuring circuit；
The ratio of the resistive potential difference in surface is calculated according to electrical parameter.
In conjunction with second aspect, further, the electrical parameter includes:
Flow through the electric current of GIL conducting rodEquivalent inductance LXWith equivalent resistance RXOn voltageWithEquivalent inductance
LsWith equivalent resistance RsOn voltageWithWhereinWith electric currentEquidirectional is resistive voltage,It will advanced electricity
90 ° of stream are perceptual voltage,WithIt is orthogonal each other；With electric currentEquidirectional is resistive voltage,Leading current
90 ° are perceptual voltage,WithIt is orthogonal each other.
In conjunction with second aspect, further, the calculation method of the ratio of the resistive potential difference in surface includes the following steps:
Following formula is obtained by electrical parameter:
It can be obtained by above-mentioned formula:
In formula:For the ratio of linkage section and connectionless section of GIL conducting rod potential difference；
For the mould of voltage on linkage section GIL conducting rod equivalent resistance；
For the mould of voltage on connectionless section of GIL conducting rod equivalent resistance；
K is the ratio of the resistive potential difference in surface；J is imaginary part unit；ω is angular frequency.
The present invention has the advantages that the system and method:
1. avoiding D.C. resistance test current condition not being inconsistent with actual working state, kelvin effect, temperature have been fully considered
Influence of the factors to resistance, resulting parameter and its characteristics such as degree will really reflect the connection status of GIL conducting rod；
2. the evaluation method is used as benchmark alternate standard AC impedance using connectionless section of GIL conducting rod, to there is linkage section
With the resistive potential difference ratio of connectionless section surface as evaluation parameter, precision, AC influence and DC influence of power supply etc. are eliminated
The influence of test condition realizes the accurate evaluation of GIL conducting rod quality of connection；
3. establishing GIL conducting rod by the resistive potential difference ratio in GIL conducting rod surface and its frequency and temperature property test
The evaluation criterion of quality of connection, while being also able to reflect the connection of GIL conducting rod under different temperatures, different frequency, different electric currents
State.
Detailed description of the invention
Fig. 1 is the measuring principle schematic diagram of the resistive potential difference ratio in GIL conducting rod surface in the present invention.
Fig. 2 is the schematic equivalent circuit of GIL conducting rod in the present invention.
Fig. 3 is the equivalent vector schematic diagram of GIL conducting rod in the present invention.
Fig. 4 is the temperature characteristic measuring schematic diagram of the resistive potential difference ratio in GIL conducting rod surface in the present invention.
Specific embodiment
To be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, below with reference to
Specific embodiment, the present invention is further explained.
As shown in Figures 1 to 4, a kind of GIL conducting rod based on resistive potential difference ratio connects evaluation system, the system packet
Include GIL conducting rod sample, the GIL conducting rod sample includes having linkage section GIL conducting rod and connectionless by the way that contact is concatenated
Section GIL conducting rod, the current terminal for having linkage section GIL conducting rod are sequentially connected current transformer, current source and connectionless section
The current terminal of GIL conducting rod, the GIL conducting rod are also connected with potential difference test loop, connection and electricity on the test loop
The precision resistance of the output end connection of current transformer.
In Fig. 1,Electric current is exported for current source；For the voltage on precision resistance；Respectively linkage section
It is poor with the surface potential of connectionless section of GIL conducting rod.
In Fig. 2,The respectively surface potential of linkage section and connectionless section of GIL conducting rod is poor；LX、RXFor linkage section
The equivalent inductance and equivalent resistance of GIL conducting rod；Respectively equivalent inductance LXWith equivalent resistance RXOn voltage；
Ls、RsFor the equivalent inductance and equivalent resistance of connectionless section of GIL conducting rod；Respectively equivalent inductance LsWith it is equivalent
Resistance RsOn voltage；For the electric current for flowing through GIL conducting rod.
In Fig. 3,The respectively surface potential of linkage section and connectionless section of GIL conducting rod is poor；Point
It Wei not equivalent inductance LXWith equivalent resistance RXOn voltage；Respectively equivalent inductance LsWith equivalent resistance RsOn electricity
Pressure；For the electric current for flowing through GIL conducting rod.
In Fig. 4,The respectively surface potential of linkage section and connectionless section of GIL conducting rod is poor；For precision
Ohmically voltage；For the electric current for flowing through GIL conducting rod.
In the present embodiment, the test loop includes the lock-in amplifier connecting with the GIL conducting rod sample, described
There are four probe, one of probes to have linkage section GIL conducting rod to connect with described for lock-in amplifier, excess-three pop one's head in
Connectionless section of GIL conducting rod connection.
In the present embodiment, the spacing of the potential end of the probe and current terminal is greater than 3 times of the GIL conducting rod sample
Diameter.
In the present embodiment, the current terminal of the current terminal for having linkage section GIL conducting rod and connectionless section of GIL conducting rod
It is equipped with fixture.
In the present embodiment, the current source is amplitude and the adjustable adjustable current source of frequency.
In the present embodiment, the flexible electric heating cover connecting with temperature control box is socketed on the outside of the GIL conducting rod sample.
A kind of GIL conducting rod quality of connection evaluation method based on the resistive potential difference ratio in surface, the method includes as follows
Step:
It is inductance L by the circuit equivalent for having linkage section GIL conducting rodxWith resistance RxConcatenated circuit 1；
It is inductance L by the circuit equivalent of connectionless section of GIL conducting rodsWith resistance RsConcatenated circuit 2；
Electrical parameter after circuit 1 and circuit 2 are connected in measuring circuit；
The ratio of the resistive potential difference in surface is calculated according to electrical parameter.
In the present embodiment, the electrical parameter includes:
Flow through the electric current of GIL conducting rodEquivalent inductance LXWith equivalent resistance RXOn voltageWithEquivalent inductance
LsWith equivalent resistance RsOn voltageWithWhereinWith electric currentEquidirectional is resistive voltage,By leading current
90 ° are perceptual voltage,WithIt is orthogonal each other；With electric currentEquidirectional is resistive voltage,90 ° of leading current
For perceptual voltage,WithIt is orthogonal each other.
In the present embodiment, the calculation method of the ratio of the resistive potential difference in the surface includes the following steps:
Following formula is obtained by electrical parameter:
It can be obtained by above-mentioned formula:
In formula:For the ratio of linkage section and connectionless section of GIL conducting rod potential difference；
For the mould of voltage on linkage section GIL conducting rod equivalent resistance；
For the mould of voltage on connectionless section of GIL conducting rod equivalent resistance；
K is the ratio of the resistive potential difference in surface, and the resistive potential difference ratio K in surface practical is linkage section and connectionless section of GIL conduction
The ratio of voltage-mode on bar equivalent resistance, reflection be linkage section Yu connectionless section of GIL conducting rod equivalent resistance ratio relation.It is aobvious
So, the alternating current of the measurement result of parameter K and applicationSize is unrelated, and the precision of power supply will not generate accuracy of measurement
It influences.Due to linkage section and connectionless section of GIL conducting rod concatenation, locating test condition is consistent, and environment temperature is to test result
Do not influence.
In above-mentioned test philosophy, potential end and the current terminal spacing of four terminals probe are greater than the straight of 3 times of GIL conducting rod
Diameter, in order to eliminate current terminal fixture and the even influence to test result of conducting rod interconnecting piece current distribution is uneven.
Based on above-mentioned, in the system and method, in the fundamental measurement principle of the resistive potential difference ratio in surface, external electromagnetic field
The influence of caused AC influence and DC influence to measurement be can not ignore, and the present invention uses lock-in amplifier and adjustable current source
Etc. technologies can effectively inhibit above-mentioned interference.Contact potential, thermoelectrical potential and chemical potential etc. in measurement circuit form direct current
The alternating current impression electromotive force that interference and external electromagnetic field generate can be all superimposed upon on measured current potential, due to being measured current potential
Poor very little, if the direct current and AC influence of directly test potential difference superposition can generate very big error, and existing measurement side
Method can not be eliminated simultaneously.Lock-in amplifier is that reference is extracted by phase sensitive detection technology with the voltage signal on precision resistance R
Identical frequency Voltage signal, and decompose and obtain resistive voltageWithAnd then realize the resistive potential difference ratio in surface
The measurement of K eliminates the influence of DC influence；Frequency by changing current source avoids the AC influence of external electromagnetic field, makes
It does not have an impact test result.
For the quality of connection of GIL conducting rod under state of more accurately investigating, temperature is also GIL conducting rod connection matter
The factor that can not ignore in amount assessment technique.The present invention uses flexible electric heating cover for the realization of GIL conducting rod sample heating method
Above-mentioned purpose, heating method are as shown in Fig. 4.
In conclusion the present invention realizes that the resistive potential difference ratio K in surface and its frequency and temperature are special according to above-mentioned measuring principle
Property measurement, establish the GIL conducting rod quality of connection based on the resistive potential difference ratio in surface evaluation criterion, differentiate GIL conducting rod
Connection status.
As known by the technical knowledge, the present invention can pass through the embodiment party of other essence without departing from its spirit or essential feature
Case is realized.Therefore, embodiment disclosed above, in all respects are merely illustrative, not the only.Institute
Have within the scope of the present invention or is included in the invention in the change being equal in the scope of the present invention.
Claims (7)
1. a kind of GIL conducting rod based on resistive potential difference ratio connects evaluation system, which is characterized in that the system comprises GIL
Conducting rod sample, the GIL conducting rod sample include having linkage section GIL conducting rod and connectionless section of GIL by the way that contact is concatenated
Conducting rod, the current terminal for having linkage section GIL conducting rod are sequentially connected current transformer, current source and connectionless section of GIL and lead
The current terminal of electric pole, the GIL conducting rod are also connected with potential difference test loop, connection and electricity on the potential difference test loop
The precision resistance of the output end connection of current transformer.
2. a kind of GIL conducting rod based on resistive potential difference ratio according to claim 1 connects evaluation system, feature exists
In: the test loop includes the lock-in amplifier connecting with the GIL conducting rod sample, and there are four electricity for the lock-in amplifier
Position probe, one of probe have linkage section GIL conducting rod to connect with described, and excess-three probe is led with connectionless section of GIL
Electric pole connection.
3. a kind of GIL conducting rod based on resistive potential difference ratio according to claim 2 connects evaluation system, feature exists
In: the diameter of the GIL conducting rod sample of the spacing greater than 3 times of the potential end and current terminal of the probe.
4. a kind of GIL conducting rod based on resistive potential difference ratio according to claim 1 connects evaluation system, feature exists
In: the flexible electric heating cover connecting with temperature control box is socketed on the outside of the GIL conducting rod sample.
5. a kind of GIL conducting rod based on resistive potential difference ratio connects evaluation method, it is characterised in that: the method includes as follows
Step:
It is inductance L by the circuit equivalent for having linkage section GIL conducting rodxWith resistance RxConcatenated circuit 1；
It is inductance L by the circuit equivalent of connectionless section of GIL conducting rodsWith resistance RsConcatenated circuit 2；
Electrical parameter after circuit 1 and circuit 2 are connected in measuring circuit；
The ratio of the resistive potential difference in surface is calculated according to electrical parameter.
6. a kind of GIL conducting rod based on resistive potential difference ratio according to claim 5 connects evaluation method, feature exists
In: the electrical parameter includes:
Flow through the electric current of GIL conducting rodEquivalent inductance LXWith equivalent resistance RXOn voltageWithEquivalent inductance LsWith
Equivalent resistance RsOn voltageWithWhereinWith electric currentEquidirectional is resistive voltage,By 90 ° of leading current
For perceptual voltage,WithIt is orthogonal each other；With electric currentEquidirectional is resistive voltage,90 ° of leading current are sense
Property voltage,WithIt is orthogonal each other.
7. a kind of GIL conducting rod based on resistive potential difference ratio according to claim 6 connects evaluation method, feature exists
In: the calculation method of the ratio of the resistive potential difference in surface includes the following steps:
Following formula is obtained by electrical parameter:
It can be obtained by above-mentioned formula:
In formula:For the ratio of linkage section and connectionless section of GIL conducting rod potential difference；
For the mould of voltage on linkage section GIL conducting rod equivalent resistance；
For the mould of voltage on connectionless section of GIL conducting rod equivalent resistance；
K is the ratio of the resistive potential difference in surface；J is imaginary part unit；ω is angular frequency.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111830322A (en) * | 2020-05-28 | 2020-10-27 | 江苏省送变电有限公司 | GIL conductor electric connection state evaluation device |
| CN112683508A (en) * | 2020-12-21 | 2021-04-20 | 江苏恒高电气制造有限公司 | Gas insulation transmission line contact life test device |
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| CN112683508A (en) * | 2020-12-21 | 2021-04-20 | 江苏恒高电气制造有限公司 | Gas insulation transmission line contact life test device |
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| CN110441646B (en) | 2021-05-18 |
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Effective date of registration: 20201118 Address after: 211102 -5, No. 58 Su Yuan Avenue, Jiangning District, Jiangsu, Nanjing Applicant after: JIANGSU POWER TRANSMISSION AND DISTRIBUTION Co.,Ltd. Applicant after: STATE GRID JIANGSU ELECTRIC POWER Co. Address before: 211102 -5, No. 58 Su Yuan Avenue, Jiangning District, Jiangsu, Nanjing Applicant before: JIANGSU POWER TRANSMISSION AND DISTRIBUTION Co.,Ltd. Applicant before: HARBIN University OF SCIENCE AND TECHNOLOGY |
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