CN105571795A - GIS air leakage fault diagnosis system and method - Google Patents

GIS air leakage fault diagnosis system and method Download PDF

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Publication number
CN105571795A
CN105571795A CN201610146213.4A CN201610146213A CN105571795A CN 105571795 A CN105571795 A CN 105571795A CN 201610146213 A CN201610146213 A CN 201610146213A CN 105571795 A CN105571795 A CN 105571795A
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China
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air chamber
gis
distributed capacitance
signal
controller
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CN201610146213.4A
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CN105571795B (en
Inventor
许洪华
王春宁
马宏忠
刘宝稳
崔杨柳
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State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
Nanjing Power Supply Co of State Grid Jiangsu Electric Power Co Ltd
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State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
Nanjing Power Supply Co of State Grid Jiangsu Electric Power Co Ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00Investigating fluid-tightness of structures
    • G01M3/02Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/26Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
    • G01M3/32Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
    • G01M3/3236Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers
    • G01M3/3272Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers for verifying the internal pressure of closed containers

Abstract

The invention discloses a GIS air leakage fault diagnosis system and method. The system comprises a temperature sensor, an air pressure sensor, a distributed capacitance measurement module, a signal conditioning circuit, an AD sampler, a controller and an alarm module. The temperature sensor, the air pressure sensor and the distributed capacitance measurement module respectively acquire environment temperature signals, air pressure signals in an air chamber and distributed capacitance signals between an air chamber conductive rod and a shell and transmit the signals to the signal conditioning circuit. The AD sampler samples the signals through signal conditioning and transmits the signals to the controller. The controller judges air leakage of the GIS air chamber according to the received signals and controls working of the alarm module according to the judgment result. The defects in the existing air leakage fault diagnosis technology of the GIS air chamber can be overcome and interference of environment temperature on air leakage fault diagnosis of the GIS air chamber can be eliminated.

Description

A kind of GIS principal fault diagnostic system and method
Technical field
The invention belongs to intelligent substation technical field, particularly a kind of GIS principal fault diagnostic system and method.
Background technology
Gas insulated combined electrical equipment (GasInsulatedSwitchgear, be called for short GIS) be electrical equipment various in electric substation except transformer all combination be assemblied in a closed metal shell, be filled with the SF of certain pressure intensity in GIS air chamber 6gas, to realize conductor to the reliable insulation between shell, alternate and fracture.Thus GIS has the advantages such as compact conformation, operational reliability be high and easy for installation.
GIS air chamber is generally equipped with gas pressure sensor, and when there being Leakage Gas, GIS air chamber pressure reduces, and generally can differentiate principal fault.But according to the equation of gas state, cause the air chamber SF of certain volume 6except gas leakage also has temperature in pressure change factor.In addition GIS conducting rod and shell are coaxial configuration, there is distributed capacitance therebetween, and electrolyte is SF 6gas, if air chamber gas leakage SF 6air pressure reduces, SF 6specific inductive capacity change, therefore can realize the monitoring of air chamber principal fault based on the change of distributed capacitance.In fact the specific inductive capacity of gas is not only relevant with pressure, and temperature is also the important factor affecting its specific inductive capacity.
In reality, in 1 year, the temperature difference of various quarters is very large, and particularly indivedual regional intraday temperature Change is very large, and this will affect accuracy and the sensitivity of the monitoring of GIS air chamber gas leakage.Need a kind of GIS air chamber principal fault detection method eliminating temperature Change for this reason.
Summary of the invention
In order to solve the technical matters that above-mentioned background technology proposes, the present invention aims to provide a kind of GIS principal fault diagnostic system and method, overcome the defect that existing GIS air chamber principal fault diagnostic techniques exists, eliminate the interference that environment temperature is diagnosed GIS air chamber principal fault.
In order to realize above-mentioned technical purpose, technical scheme of the present invention is:
A kind of GIS principal fault diagnostic system, comprise temperature sensor, baroceptor, distributed capacitance measurement module, signal conditioning circuit, AD sampling thief, controller and alarm module, described baroceptor and distributed capacitance measurement module are arranged in GIS air chamber, the output terminal of temperature sensor, baroceptor, distributed capacitance measurement module is connected with the input end of signal conditioning circuit respectively, the output terminal of the input end connection signal modulate circuit of AD sampling thief, controller connects output terminal and the alarm module of AD sampling thief respectively; Described temperature sensor, baroceptor and distributed capacitance measurement module gather ambient temperature signal, air chamber internal gas pressure signal and the distributed capacitance signal between air chamber conducting rod and shell respectively and send signal conditioning circuit to, AD sampler samples through signal condition signal and send controller to, according to the signal received, controller judges whether GIS air chamber leaks gas, and control alarm module work according to judged result.
Further, described signal conditioning circuit comprises amplifying circuit and filtering circuit, the input end of amplifying circuit connects the output terminal of temperature sensor, baroceptor and distributed capacitance measurement module, the output terminal of amplifying circuit connects the input end of filtering circuit, and the output terminal of filtering circuit connects the input end of AD sampling thief.
Further, described alarm module comprises the LED and hummer that are connected with controller respectively.
Further, described controller adopts arm processor.
The present invention also comprises a kind of GIS principal fault diagnostic method, comprises the following steps:
(1) normal temperature t is measured 0the pressure P of lower GIS air chamber 0and the distributed capacitance C between air chamber conducting rod and shell 0numerical value, and to preserve;
(2) the pressure P of GIS air chamber and the distributed capacitance C between air chamber conducting rod and shell under current time temperature t is measured;
(3) theoretical value of air chamber pressure is calculated: P 0× t/t 0, calculate the theoretical value of the distributed capacitance between air chamber conducting rod and shell: k c× C 0, wherein coefficient k cfor:
k c = 1 + 533.2 πα 3 P 0 / [ k ( 273 + t 0 ) ] 1 + 533.2 πα 3 P 0 t / [ kt 0 ( 273 + t ) ] - - - ( 1 )
In formula (1), k is this graceful constant of bohr, k=1.38 × 10 -23j/K, α are SF in GIS air chamber 6gas molecule radius;
(4) if P-P 0× t/t 0<0, and C-k c× C 0<0, then judge that air chamber leaks gas; If P-P 0× t/t 0=0, and C-k c× C 0=0, then judge that air chamber does not leak gas.
Adopt the beneficial effect that technique scheme is brought:
The present invention according to temperature to air chamber SF 6the impact of gas pressure intensity and specific inductive capacity, the pressure of the correspondence of the non-fault of testing temperature lower chamber and distributed capacitance when calculating, then compare with the air chamber pressure of actual measurement and distributed capacitance, realize air chamber principal fault and differentiate.The present invention can eliminate temperature Change when GIS runs, on the impact of air chamber principal fault identification, has pressure and distributed capacitance two characteristic quantities, improves the accuracy of fault distinguishing.
Accompanying drawing explanation
Fig. 1 is the block diagram of system of the present invention;
Fig. 2 is method flow diagram of the present invention.
Embodiment
Below with reference to accompanying drawing, technical scheme of the present invention is described in detail.
The block diagram of system of the present invention as shown in Figure 1, a kind of GIS principal fault diagnostic system, comprise temperature sensor, baroceptor, distributed capacitance measurement module, signal conditioning circuit, AD sampling thief, controller and alarm module, described baroceptor and distributed capacitance measurement module are arranged in GIS air chamber, temperature sensor, baroceptor, the output terminal of distributed capacitance measurement module is connected with the input end of signal conditioning circuit respectively, the output terminal of the input end connection signal modulate circuit of AD sampling thief, controller connects output terminal and the alarm module of AD sampling thief respectively, described temperature sensor, baroceptor and distributed capacitance measurement module gather ambient temperature signal, air chamber internal gas pressure signal and the distributed capacitance signal between air chamber conducting rod and shell respectively and send signal conditioning circuit to, AD sampler samples through signal condition signal and send controller to, according to the signal received, controller judges whether GIS air chamber leaks gas, and control alarm module work according to judged result.
In the present embodiment, signal conditioning circuit comprises amplifying circuit and filtering circuit, the input end of amplifying circuit connects the output terminal of temperature sensor, baroceptor and distributed capacitance measurement module, the output terminal of amplifying circuit connects the input end of filtering circuit, and the output terminal of filtering circuit connects the input end of AD sampling thief.
In the present embodiment, alarm module comprises the LED and hummer that are connected with controller respectively, when controller judges that GIS air chamber leaks gas, and driving LED flicker, buzzer call.
In the present embodiment, described controller adopts arm processor.
The present invention also comprises a kind of GIS principal fault diagnostic method, as shown in Figure 2, comprises the following steps:
(1) normal temperature t is measured 0the pressure P of lower GIS air chamber 0and the distributed capacitance C between air chamber conducting rod and shell 0numerical value, and to preserve;
(2) the pressure P of GIS air chamber and the distributed capacitance C between air chamber conducting rod and shell under current time temperature t is measured;
(3) theoretical value of air chamber pressure is calculated: P 0× t/t 0, the theoretical value of the distributed capacitance between counting chamber conducting rod and shell: k c× C 0, wherein coefficient k cfor:
k c = 1 + 533.2 &pi;&alpha; 3 P 0 / &lsqb; k ( 273 + t 0 ) &rsqb; 1 + 533.2 &pi;&alpha; 3 P 0 t / &lsqb; kt 0 ( 273 + t ) &rsqb; - - - ( 1 )
In formula (1), k is this graceful constant of bohr, k=1.38 × 10 -23j/K, α are SF in GIS air chamber 6gas molecule radius;
(4) if P-P 0× t/t 0<0, and C-k c× C 0<0, then judge that air chamber leaks gas; If P-P 0× t/t 0=0, and C-k c× C 0=0, then judge that air chamber does not leak gas.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.

Claims (5)

1. a GIS principal fault diagnostic system, it is characterized in that: comprise temperature sensor, baroceptor, distributed capacitance measurement module, signal conditioning circuit, AD sampling thief, controller and alarm module, described baroceptor and distributed capacitance measurement module are arranged in GIS air chamber, the output terminal of temperature sensor, baroceptor, distributed capacitance measurement module is connected with the input end of signal conditioning circuit respectively, the output terminal of the input end connection signal modulate circuit of AD sampling thief, controller connects output terminal and the alarm module of AD sampling thief respectively; Described temperature sensor, baroceptor and distributed capacitance measurement module gather ambient temperature signal, air chamber internal gas pressure signal and the distributed capacitance signal between air chamber conducting rod and shell respectively and send signal conditioning circuit to, AD sampler samples through signal condition signal and send controller to, according to the signal received, controller judges whether GIS air chamber leaks gas, and control alarm module work according to judged result.
2. a kind of GIS principal fault diagnostic system according to claim 1, it is characterized in that: described signal conditioning circuit comprises amplifying circuit and filtering circuit, the input end of amplifying circuit connects the output terminal of temperature sensor, baroceptor and distributed capacitance measurement module, the output terminal of amplifying circuit connects the input end of filtering circuit, and the output terminal of filtering circuit connects the input end of AD sampling thief.
3. a kind of GIS principal fault diagnostic system according to claim 1, is characterized in that: described alarm module comprises the LED and hummer that are connected with controller respectively.
4. a kind of GIS principal fault diagnostic system according to claim 1, is characterized in that: described controller adopts arm processor.
5. a GIS principal fault diagnostic method, is characterized in that, comprises the following steps:
(1) normal temperature t is measured 0the pressure P of lower GIS air chamber 0and the distributed capacitance C between air chamber conducting rod and shell 0numerical value, and to preserve;
(2) the pressure P of GIS air chamber, the distributed capacitance C between air chamber conducting rod and shell under current time temperature t is measured;
(3) theoretical value of air chamber pressure is calculated: P 0× t/t 0, calculate the theoretical value of the distributed capacitance between air chamber conducting rod and shell: k c× C 0, wherein coefficient k cfor:
k c = 1 + 533.2 &pi;&alpha; 3 P 0 / &lsqb; k ( 273 + t 0 ) &rsqb; 1 + 533.2 &pi;&alpha; 3 P 0 t / &lsqb; kt 0 ( 273 + t ) &rsqb; - - - ( 1 )
In formula (1), k is this graceful constant of bohr, k=1.38 × 10 -23j/K, α are SF in GIS air chamber 6gas molecule radius;
(4) if P-P 0× t/t 0<0, and C-k c× C 0<0, then judge that air chamber leaks gas; If P-P 0× t/t 0=0, and C-k c× C 0=0, then judge that air chamber does not leak gas.
CN201610146213.4A 2016-03-15 2016-03-15 A kind of GIS principal faults diagnostic system and method Active CN105571795B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107748039A (en) * 2017-09-14 2018-03-02 国家电网公司 The quick quantitative detecting method that do not have a power failure of GIS device gas leakage based on helium tracer
CN108287274A (en) * 2017-12-18 2018-07-17 国网内蒙古东部电力有限公司检修分公司 The fault detect positioning device and method of GIS heating devices under a kind of low temperature

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CN202562524U (en) * 2012-05-03 2012-11-28 上海精鼎电力科技有限公司 SF6 gas moisture pressure and density on-line monitoring device
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CN204758243U (en) * 2015-06-16 2015-11-11 常州集贤科技有限公司 Gaseous dew point of SF6 leaks tester
CN105301387A (en) * 2015-10-09 2016-02-03 河海大学 Gas insulated switchgear (GIS) gas chamber medium fault diagnosis system based on medium loss monitoring and diagnosis method thereof

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Publication number Priority date Publication date Assignee Title
CN2237238Y (en) * 1995-04-08 1996-10-09 南征 Intelligent SF6 gas density monitor
JP4495103B2 (en) * 2006-03-27 2010-06-30 三菱電機株式会社 Gas leak detection device and gas leak detection method
CN202562524U (en) * 2012-05-03 2012-11-28 上海精鼎电力科技有限公司 SF6 gas moisture pressure and density on-line monitoring device
CN104568323A (en) * 2014-06-25 2015-04-29 贵州电力试验研究院 SF6 gas leakage on-line monitoring and alarming system
CN204758243U (en) * 2015-06-16 2015-11-11 常州集贤科技有限公司 Gaseous dew point of SF6 leaks tester
CN105301387A (en) * 2015-10-09 2016-02-03 河海大学 Gas insulated switchgear (GIS) gas chamber medium fault diagnosis system based on medium loss monitoring and diagnosis method thereof

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107748039A (en) * 2017-09-14 2018-03-02 国家电网公司 The quick quantitative detecting method that do not have a power failure of GIS device gas leakage based on helium tracer
CN108287274A (en) * 2017-12-18 2018-07-17 国网内蒙古东部电力有限公司检修分公司 The fault detect positioning device and method of GIS heating devices under a kind of low temperature

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