CN106896257B - The electric state detection system of super-pressure wall bushing - Google Patents

The electric state detection system of super-pressure wall bushing Download PDF

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Publication number
CN106896257B
CN106896257B CN201710067881.2A CN201710067881A CN106896257B CN 106896257 B CN106896257 B CN 106896257B CN 201710067881 A CN201710067881 A CN 201710067881A CN 106896257 B CN106896257 B CN 106896257B
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casing
voltage
measurement
external
external capacitor
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CN106896257A (en
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肖遥
周红阳
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Maintenance and Test Center of Extra High Voltage Power Transmission Co
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Maintenance and Test Center of Extra High Voltage Power Transmission Co
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/10Measuring sum, difference or ratio

Abstract

The invention discloses a kind of electric state detection systems of super-pressure wall bushing; portion of techniques improvement has been done to traditional wall bushing; and voltage and current detection circuit and monitoring and protecting module are devised on this basis; the state of wall bushing is monitored and is protected by the electric current of the voltage and external impressed current mutual inductor that detect external capacitor; due to that can detect at any time and not influence the operation of casing, so that this detection system timeliness with higher and safety.

Description

The electric state detection system of super-pressure wall bushing
Technical field
The present invention relates to electric system T & D Technology fields, and in particular to a kind of electric state of super-pressure wall bushing Detection system.
Background technique
Family is necessarily placed in super (spy) high-voltage alternating substation and the converter station of D.C. high voltage transmission, certain equipment It is interior, with exterior insulation failure caused by guaranteeing good running environment, for example prevent filth, misty rain etc..One of them is typical Case is: in the converter station of DC transmission system, converter valve is all mounted in valve hall, needs to pass through HVDC Wall Bushing Connect converter valve and outdoor DC equipment.
Super (spy) high-voltage wall bushing causes its total length beyond the technique control of manufacture due to the requirement of its external insulation performance System is horizontal, therefore to super (spy) high-voltage wall bushing, the mode for generally taking two restrainings to make then docking assembling is installed.Fig. 1 is The typical structure schematic diagram of existing super (spy) high-voltage wall bushing, wherein by casing 1 (indoor part) and casing 2 (outdoor part) The docking assembling of two sections is constituted.Casing 1 has housing 1-1, high-voltage conductive rod 1-2, capacitor layers 1-3, end shield 1-4 and end shield ground terminal Sub- 1-5, flange 1-6.Casing 2 has housing 2-1, high-voltage conductive rod 2-2, capacitor layers 2-3, end shield 2-4 and end shield ground terminal 2-5, flange 2-6.Casing 1 and casing 2 pass through flange for the fixed peace of casing by flange 1-6 and 2-6 implementation sealing and docking On wall;Conducting rod 1-2 and 2-2 then pass through a copper cylinder 3 and implement electrical connection, cylinder 3 and conducting rod 1-2 and 2-2 Between there are also silver-plated elastic fingertips to enhance its contact performance.
But the wall bushing in actual motion can lead to failure, such as inside pipe casing creeping discharge due to various reasons, Capacitance of bushing breakdown etc..Existing casing state monitoring method is the oil sample or SF by extracting casing6Gas sample detection Oily, gas ingredient therein, passes through the state of the constituent analysis casing detected.The defect of this mode is generally to wait and stop It samples when electric;In addition it is exactly the electric property variation that general oily, gas composition transfer often lags behind casing, causes to detect Imeliness problem.Also have in such a way that bottom shielding of bushing down conductor installs current transformer come monitoring sleeve dielectric loss and Electric capacitance change implements the mode of Casing Detection, but this mode may cause bottom shielding of bushing opens a way in operation, application Therefore range is restricted.
Summary of the invention
In view of the deficiencies of the prior art, the purpose of the present invention is to provide a kind of inspections of the electric state of super-pressure wall bushing Examining system, quickly and safely to detect the state of casing.
To achieve the goals above, the technical solution adopted by the present invention is that:
A kind of electric state detection system of super-pressure wall bushing, including voltage and current detection circuit and monitoring and protecting mould Block;
The wall bushing is assembled by the 2 liang of section casing docking of casing 1 and casing, in the secondary outer layer of casing 1 and casing 2 Capacitance plate draws a measurement terminal respectively;
The voltage and current observation circuit includes the first measuring unit, the second measuring unit and photoelectric converter, the light Electric transducer connects the monitoring and protecting module;
Connect between the measurement terminal and grounding point of casing 1 first measuring unit, first measuring unit by External capacitor C1It is composed in series with external impressed current mutual inductor TA1, the external capacitor C1High-voltage end accesses the measurement terminal of casing 1, The low-pressure end of external impressed current mutual inductor TA1 is grounded;Second measurement of connecting between the measurement terminal and grounding point of casing 2 is single Member, second measuring unit is by external capacitor C2It is composed in series with external impressed current mutual inductor TA2, the external capacitor C2High pressure Terminate the measurement terminal into casing 2, the low-pressure end ground connection of external impressed current mutual inductor TA2;
By 1 external capacitor C of casing1The voltage measurement signal U at both ends1, by 2 external capacitor C of casing2The voltage measurement at both ends Signal U2, 1 external impressed current mutual inductor TA1 of casing current measurement signal IC1And the electricity of 2 external impressed current mutual inductor TA2 of casing Flow measurement signal IC2It is respectively connected to the input terminal of photoelectric converter, photoelectric converter is by voltage measurement signal U1, voltage measurement letter Number U2, current measurement signal IC1With current measurement signal IC2After being converted into optical signal, it is transmitted through the fiber to the monitoring and protecting Module;
By following formula, external capacitor C is set1And C2Value:
Wherein, U0For the primary voltage of the conducting rod of the wall bushing;U01、U02Respectively casing 1, the external electricity of casing 2 Hold C1、C2The measurement voltage design value at both ends, C01、C02Going out respectively between the conducting rod and measurement terminal of casing 1, casing 2 Factory's capacitance, Cd1、Cd2Factory capacitance respectively between the end shield ground terminal and measurement terminal of casing 1, casing 2;
The monitoring and protecting module passes through detection IC1/U1Whether initial setting j ω C is equal to1To judge external capacitor C1It is It is no normal;By detecting IC2/U2Whether initial setting j ω C is equal to2To judge external capacitor C2It is whether normal;
If external capacitor C1With external capacitor C2Normal, described sleeve pipe monitoring and protecting module passes through detection casing 1 and casing The voltage measurement signal U of 2 measurement terminal external capacitors1With voltage measurement signal U2RatioWhether close to root According to casing factory-said value C01、C02、Cd1、Cd2With setting value C1、C2The following initial setting calculated
And/or
Pass through the current measurement signal of casing 1 and the measurement terminal external impressed current mutual inductor of casing 2WithRatioWhether close to according to casing factory-said value C01、C02、Cd1、Cd2With setting value C1、C2The following initial setting up calculated Value
To judge the capacitance C of inside pipe casing01、Cd1、C02、Cd2Whether change, realizes the status monitoring of casing.
The electric state detection system of super-pressure wall bushing of the present invention has been done portion of techniques to traditional wall bushing and has been changed Into, and devise voltage and current detection circuit and monitoring and protecting module on this basis, by detect external capacitor voltage and The electric current of external impressed current mutual inductor is monitored and protects to the state of wall bushing, due to that can detect at any time and not influence to cover The operation of pipe, so that this detection system timeliness with higher and safety.
Detailed description of the invention
Fig. 1 is the structure principle chart of existing super (spy) high-voltage wall bushing;
Fig. 2 is the structure principle chart and its voltage and current detection circuit of improved super (spy) high-voltage wall bushing;
Fig. 3 is the simplification figure after Fig. 2 removal label;
Fig. 4 is one embodiment of voltage and current detection circuit;
The structural schematic diagram of the electric state detection system of Fig. 5 super-pressure wall bushing of the embodiment of the present invention;
Fig. 6 is the principle of equal effects circuit diagram of casing and its voltage and current detection circuit;
Fig. 7 is monitoring and relay protective scheme block diagram in the embodiment of the present invention.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer and more explicit, right as follows in conjunction with drawings and embodiments The present invention is further described.
Fig. 2 is the structure principle chart of improved super (spy) high-voltage wall bushing, wherein by casing 1 (indoor part) and casing The docking assembling of 2 (outdoor part) two sections is constituted.Casing 1 has housing 1-1, high-voltage conductive rod 1-2, capacitor layers 1-3, end shield 1-4 And end shield ground terminal 1-5, flange 1-6.Casing 2 has housing 2-1, high-voltage conductive rod 2-2, capacitor layers with high pressure housing 2 2-3, end shield 2-4 and end shield ground terminal 2-5, flange 2-6.Casing 1 and casing 2 implement sealing and right by flange 1-6 and 2-6 It connects, and is fixed on the wall casing by flange;Conducting rod 1-2 and 2-2 then pass through a copper cylinder 3 and implement electrical connection, There are also silver-plated elastic fingertips to enhance its contact performance between cylinder and conducting rod 1-2 and 2-2.In addition, increasing by a voltage in casing 1 Measurement terminal 1-7 increases by a voltage measurement terminal 2-7 in casing 2.The two voltage measurement terminals are respectively by casing 1 and casing 2 Secondary outer layer capacitance plate in draw.
If the not external measuring device of measurement terminal, usually direct reliable ground, this makes the ground connection of casing more may be used It leans on, because there are two grounding point, casing failure caused by can preventing end shield grounding point therein or measurement grounding point from opening a way.
As shown in Fig. 2, a measuring unit of connecting between the measurement terminal 1-7 and grounding point of casing 1, the measurement list Member is by capacitor C1It is composed in series with current transformer TA1, the capacitor C1High-voltage end accesses the measurement terminal 1-7 of casing, electric current The low-pressure end of mutual inductor TA1 is grounded;It connects between the measurement terminal and grounding point of casing 2 measuring unit, the measurement Unit is by capacitor C2It is composed in series with current transformer TA2, the capacitor C2High-voltage end accesses the measurement terminal 2-7 of casing, electricity The low-pressure end of current transformer TA2 is grounded.The label in Fig. 2 to be deleted, Fig. 3 is obtained convenient for checking.
The sleeve monitoring system further include: the measuring unit of casing 1 and casing 2 respectively an in parallel discharging gap with Arrester or varistor, discharging gap is in parallel with the high-voltage end of external capacitor with the high-voltage end of arrester or varistor, low Pressure side ground connection.Fig. 4 is the mode that discharging gap and arrester or varistor access preposition measuring circuit, wherein C and TA difference Represent the C of Fig. 2 middle sleeve 11And TA1Or the C in casing 22And TA2, 10 be discharging gap, and 11 be arrester or pressure-sensitive electricity Resistance.
It further include photoelectric converter, the 1 external capacitor C of input terminal lead-in bushing of photoelectric converter in Fig. 41The voltage at both ends Measuring signal U1, 2 external capacitor C of casing2The voltage measurement signal U at both ends2, 1 external impressed current mutual inductor TA1 of casing electric current survey Measure signal IC1, 2 external impressed current mutual inductor TA2 of casing current measurement signal IC2, photoelectric converter is by U1、U2、IC1、IC2Conversion After optical signal, it is transmitted through the fiber to monitoring and protecting module.
Fig. 5 is detection and protection control general diagram of the invention.Voltage and current detection circuit therein as shown in Fig. 2, By photoelectric converter by U1、U2、IC1、IC2After being converted into optical signal, it is transmitted through the fiber to monitoring and protecting module.Monitoring and protecting Module is then implemented to detection limit U1、U2、IC1、IC2Analytical judgment, alarm signal or control are issued by the result of analytical judgment Signal processed.
In specific embodiment, first have to obtain each capacitance when casing factory: the conducting rod 1-2 of casing 1 and survey Measure the capacitance C between terminal 1-701, capacitance C between the end shield ground terminal 1-5 and measurement terminal 1-7 of casing 1d1;Set Capacitance C between the conducting rod 2-2 and measurement terminal 2-7 of pipe 202, the end shield ground terminal 2-5 and measurement terminal 2-7 of casing 2 Between capacitance Cd2.After knowing above-mentioned factory-said value, it can be selected by following formula and external measurement capacitor C is set1And C2's Value:
Wherein U0It is the primary voltage of wall bushing conducting rod, U01It is the external capacitor C of casing 11The voltage measurement at both ends Design value, U02It is the external capacitor C of casing 22The voltage measurement design value at both ends.Generally U is selected in design01=U02
Using the detection circuit of super (spy) bushing electric current and voltage shown in Fig. 2 to Fig. 5, the original of casing protection is realized It manages as follows:
The primary circuit of Fig. 2 is simplified first, obtains the simplified pinciple figure of Fig. 6, the simplified pinciple figure for casing 1 and Speech.The simplified pinciple figure of casing 2 is consistent with Fig. 6 on circuit form, only each electrical quantity of casing 2 need to be substituted phase in casing 1 The electrical quantity answered.
Under normal circumstances, pass through the external capacitor C of casing 11The voltage U detected1For
Pass through the external capacitor C of casing 22The voltage U detected2For
The electric current I detected by 1 external impressed current mutual inductor TA1 of casingC1For
The electric current I detected by 2 external impressed current mutual inductor TA2 of casingC2Are as follows:
Pass through the detection voltage I of casing 1C1And U1Ratio obtain
Pass through the detection voltage I of casing 2C2And U2Ratio obtain
Therefore, I is detected by monitoring circuitC1/U1Value, IC2/U2Value whether meet above-mentioned two relationship respectively Judge C1And C2State.If C1Or C2Above-mentioned initial value is deviated from, illustrates C1Or C2It goes wrong.
Furthermore it is possible to pass through U respectively1And U2RatioTo judge the state of casing.Casing normal condition Under, ratio meets following relationships
Electric current I can also be passed throughC1And IC2RatioTo judge the state of casing.Under casing normal condition, Its ratio meets following relationships
In external capacitor C1And C2Under the conditions of normal, if there is any variation, above-mentioned ratio in the capacitance of inside pipe casing Value will deviate from original value, illustrates that casing breaks down, there is internal capacitance breakdown.
In external capacitor C1And C2Under the conditions of normal, there is any failure in inside pipe casing, thus leads to voltage ratioAndBut according to (13) and (14) formula, kUAnd kIVariation tendency it is consistent, and Keep kU/kI≈1.Therefore can judge whether monitoring and protecting system is normal in this way, realize the self-test function of protective device Energy.
Under normal circumstances, formula (13) and formula (14) be phase angle close to zero normal plural number, and phase angle is substantially equal to zero.If There is variation variation in the dielectric loss value of casing 1 or casing 2, then can be reflected by formula (13) and formula (14), that is, pass through inspection It surveysPhase angle andPhase angle change, realize the dielectric loss monitoring function of casing.
According to above-mentioned principle, the method for monitoring and protection is as follows to be realized to super (spy) bushing:
(1) it is arranged
(2) actual measurement voltage U is calculated1With measurement voltage U2Ratio, further calculate kUWith kU0's Ratio AU=kU/kU0.If AU≈ 1 then illustrates that casing is in normal condition;If AU≥A2Or AU≤A3(A3=1/A2), Then casing is in minor failure, issues alarm signal;If AU≥A1Or AU≤A4(A4=1/A1), then issue trip signal.
(3) it is arranged
(4) actual measurement electric current I is calculatedC1With measurement electric current IC2Ratio, further calculate kIWith kI0 Ratio AI=kI/kI0.If AI≈ 1 then illustrates that casing is in normal condition;If AI≥A2Or AI≤A3(A3=1/ A2), then casing is in minor failure, issues alarm signal;If AI≥A1Or AI≤A4(A4=1/A3), then issue tripping Signal.
(5) measurement voltage U is utilized1With measurement electric current IC1Extrapolate measurement admittance or impedance value whether with external capacitor C1's The initial value of admittance or impedance value is consistent, to judge external capacitor C1It is whether normal;Measurement voltage U is utilized simultaneously2With measurement electric current IC2Extrapolate measurement admittance or impedance value whether with external capacitor C2Admittance or impedance value it is consistent, to judge external capacitor C2It is It is no normal.
(6) A obtained using actual measurementU/AIWhether close to 1, Lai Shixian sleeve monitoring system self-checking function
Fig. 7 is the working principle diagram of monitoring provided in an embodiment of the present invention with protection processing module,
The setting valve of 4 protections: trip value A is provided in the present embodiment1, warning value A2, warning value A3, trip value A4.This 4 setting valves need to meet A1>A2>1>A3>A4Relationship.A1~A4The specific value of setting valve can be carried out according to specific condition It determines.According to preventive trial regulation, it may be considered that by A11.15 are set as, by A2It is set as 1.05.
Since casing will continue several cycles or even a few hours from slight breakdown to the time course seriously punctured, detecting To the ratio k of voltageUWith the ratio k of electric currentIAppearance is more prescribed a time limit, and casing ground short circuit is prevented by way of alerting or tripping Generation.
Above-listed detailed description is illustrating for possible embodiments of the present invention, and the embodiment is not to limit this hair Bright the scope of the patents, all equivalence enforcements or change without departing from carried out by the present invention, is intended to be limited solely by the scope of the patents of this case.

Claims (5)

1. a kind of electric state detection system of super-pressure wall bushing, which is characterized in that
The wall bushing is assembled by the 2 liang of section casing docking of casing 1 and casing, in time outer layer capacitance of casing 1 and casing 2 Screen draws a measurement terminal respectively;
The electric state detection system includes voltage and current detection circuit and monitoring and protecting module;
The voltage and current detection circuit includes the first measuring unit, the second measuring unit and photoelectric converter, and the photoelectricity turns Parallel operation connects the monitoring and protecting module;
It connects between the measurement terminal and grounding point of casing 1 first measuring unit, first measuring unit is by external Capacitor C1It is composed in series with external impressed current mutual inductor TA1, the external capacitor C1High-voltage end accesses the measurement terminal of casing 1, external The low-pressure end of current transformer TA1 is grounded;It connects between the measurement terminal and grounding point of casing 2 second measuring unit, Second measuring unit is by external capacitor C2It is composed in series with external impressed current mutual inductor TA2, the external capacitor C2High pressure termination Enter the measurement terminal of casing 2, the low-pressure end ground connection of external impressed current mutual inductor TA2;
By 1 external capacitor C of casing1The voltage measurement signal U at both ends1, 2 external capacitor C of casing2The voltage measurement signal U at both ends2、 The current measurement signal I of 1 external impressed current mutual inductor TA1 of casingC1And the current measurement letter of 2 external impressed current mutual inductor TA2 of casing Number IC2It is respectively connected to the input terminal of photoelectric converter, photoelectric converter is by voltage measurement signal U1, voltage measurement signal U2, electric current Measuring signal IC1With current measurement signal IC2After being converted into optical signal, it is transmitted through the fiber to the monitoring and protecting module;
By following formula, external capacitor C is set1And C2Value:
Wherein, U0For the primary voltage of the conducting rod of the wall bushing;U01、U02Respectively casing 1,2 external capacitor C of casing1、 C2The measurement voltage design value at both ends, C01、C02Factory capacitor respectively between the conducting rod and measurement terminal of casing 1, casing 2 Value, Cd1、Cd2Factory capacitance respectively between the end shield ground terminal and measurement terminal of casing 1, casing 2;
The monitoring and protecting module passes through detection IC1/U1Whether initial setting j ω C is equal to1To judge external capacitor C1Whether just Often, by detecting IC2/U2Whether initial setting j ω C is equal to2To judge external capacitor C2It is whether normal;
If external capacitor C1With external capacitor C2Normal, then the monitoring and protecting module is measured by detection casing 1 and casing 2 The voltage measurement signal U of terminal external capacitor1With voltage measurement signal U2RatioWhether close to according to casing Factory-said value C01、C02、Cd1、Cd2With setting value C1、C2The following initial setting calculated
And/or
Pass through the current measurement signal of casing 1 and the measurement terminal external impressed current mutual inductor of casing 2WithRatioWhether close to according to casing factory-said value C01、C02、Cd1、Cd2With setting value C1、C2The following initial setting up calculated Value
To judge the capacitance C of inside pipe casing01、Cd1、C02、Cd2Whether change, realizes the status monitoring of casing.
2. the electric state detection system of super-pressure wall bushing according to claim 1, which is characterized in that
The output end of the monitoring and protecting module is separately connected alarm module and control module;
If AU=kU/kU0If AU≈ 1 then illustrates that casing is in normal condition;If AU≥A2Or AU≤A3, wherein A3= 1/A2, then the wall bushing is in minor failure state, and the alarm module issues alarm signal;If AU≥A1Or AU ≤A4, wherein A4=1/A1, the control module sending trip signal;
A1~A4For 4 setting valves: trip value A1, warning value A2, warning value A3, trip value A4, and 4 setting valves meet A1>A2>1 >A3>A4Relationship, A1It is set as 1.15, A2It is set as 1.05.
3. the electric state detection system of super-pressure wall bushing according to claim 1, which is characterized in that
The measurement voltage ratio that the monitoring and protecting module passes through detection casing 1 and casing 2Phase angle change, with And the measurement current ratio of detection casing 1 and casing 2Phase angle change, realize the dielectric loss monitoring function of casing.
4. the electric state detection system of super-pressure wall bushing according to claim 1, which is characterized in that
The monitoring and protecting module passes throughWithRatio kU/kIWhether close to 1, to judge this inspection Whether examining system is normal, realizes the self-checking function of this detection system.
5. the electric state detection system of super-pressure wall bushing according to claim 1, which is characterized in that
One group of discharging gap and arrester in parallel are also distinguished at the both ends of first measuring unit and second measuring unit Or varistor;
Wherein discharging gap is in parallel with the high-voltage end of external capacitor with the high-voltage end of arrester or varistor, low-pressure end ground connection.
CN201710067881.2A 2017-02-07 2017-02-07 The electric state detection system of super-pressure wall bushing Active CN106896257B (en)

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Publication number Priority date Publication date Assignee Title
CN113030776B (en) * 2021-03-31 2022-05-17 中国南方电网有限责任公司超高压输电公司检修试验中心 Flexible direct-current wall bushing monitoring device, monitoring method and fault judgment method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101944719A (en) * 2010-08-20 2011-01-12 中国南方电网有限责任公司超高压输电公司检修试验中心 Detection system and detection method of capacitance sleeve pipe and current transformer
CN103267912A (en) * 2013-04-27 2013-08-28 中国南方电网有限责任公司超高压输电公司检修试验中心 Risk assessment system and risk assessment method for direct-current transmission wall bushing
CN203644531U (en) * 2014-01-10 2014-06-11 郑秀 High-voltage capacitor-type wall sleeve device
CN204303479U (en) * 2014-11-06 2015-04-29 中国南方电网有限责任公司超高压输电公司检修试验中心 One ± 800kV ultrahigh voltage direct current wall bushing

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101944719A (en) * 2010-08-20 2011-01-12 中国南方电网有限责任公司超高压输电公司检修试验中心 Detection system and detection method of capacitance sleeve pipe and current transformer
CN103267912A (en) * 2013-04-27 2013-08-28 中国南方电网有限责任公司超高压输电公司检修试验中心 Risk assessment system and risk assessment method for direct-current transmission wall bushing
CN203644531U (en) * 2014-01-10 2014-06-11 郑秀 High-voltage capacitor-type wall sleeve device
CN204303479U (en) * 2014-11-06 2015-04-29 中国南方电网有限责任公司超高压输电公司检修试验中心 One ± 800kV ultrahigh voltage direct current wall bushing

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