CN101968459B - Detection method of internal faults of switch cabinet - Google Patents

Detection method of internal faults of switch cabinet Download PDF

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Publication number
CN101968459B
CN101968459B CN 201010260267 CN201010260267A CN101968459B CN 101968459 B CN101968459 B CN 101968459B CN 201010260267 CN201010260267 CN 201010260267 CN 201010260267 A CN201010260267 A CN 201010260267A CN 101968459 B CN101968459 B CN 101968459B
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CN
China
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gas
cabinet
switch
module
switch cabinet
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CN 201010260267
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Chinese (zh)
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CN101968459A (en
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周徐达
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上海市电力公司
国家电网公司
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Publication of CN101968459A publication Critical patent/CN101968459A/en
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Abstract

The invention relates to a detection method and a detection device of internal faults of a switch cabinet, belonging to the field of power transformation and distribution. For the switch cabinet which is in hot-line operation when a cabinet door is in a closed state, the gas in the internal space of the cabinet body is extracted by utilizing a through hole of the cabinet body of the switch cabinet from the external part of the cabinet body; and by extraction, measurement and data comparison of the gas in the internal space of the cabinet body in the hot-line operation state, each numerical value of the unbalanced voltage representing a characteristic gas concentration item is compared with the numerical value of the unbalanced voltage representing the characteristic gas concentration item of ambient environment air and/or other switch cabinet freight spaces, thereby discovering the accident in the early stage or early accident potential in the switch cabinet as soon as possible to prevent the accident from expanding or further spreading. By adopting a gas acquisition mode, the invention can sensitively detect the common operation faults of the switch equipment in the cabinet. When the switch cabinet operates, the switch cabinet in the operation state does not need to be stopped, and the existing switch cabinet equipment does not need to be changed, thus the implementation cost is low, and the normal operation of the existing equipment can not be affected.

Description

A kind of detection method of internal faults of switch cabinet

Technical field

The invention belongs to and become the distribution field, relate in particular to a kind of fault detection method for power delivery/distributing equipment.

Background technology

Along with the fast development of China's economy, also obtained for a long time development fast as the power industry on basis.As one of visual plant in power construction, the application of enclosed type combined electrical apparatus is day by day universal, also safety/the stable operation of enclosed type combined electric appliance equipment is had higher requirement simultaneously.

The air insulation switch cubicle is a kind of of enclosed type combined electrical apparatus, is widely used in the switchgear of 10 ~ 40.5KV.

Yet due to the characteristics of its closed enclosure body structure, the air insulation switch cubicle also has certain shortcoming, is mainly extremely early stage what occur at internal electric, finds more difficult.If can not in time find and process, usually can cause the damage of switchgear and appurtenances thereof/destroy by fire, even can have influence on when serious the operation of whole system and whole transformer and distribution power station/ the person/device security.

concrete, the air insulation switch cubicle generally adopts the box body shape structure, it all is placed on cabinet inside with all elements of controller switching equipment, the problem that such version is brought is exactly can't be outside in time from cabinet/understand intuitively the equipment operation condition (during normal charging operation, the cabinet door of cabinet is to be in closed condition) of cabinet inside, for the modal conductor joint heating of primary equipment, sulfur hexafluoride gas leaks, the faults such as shelf depreciation is abnormal, can't be by directly perceived outside cabinet, significantly mode is in time found or shows, when discovered, often led to serious consequence.

For example, for the leakage failure of sulfur hexafluoride insulating gas, only have when pressure is lower than warning or locking value by the time, could indirectly show by alarm window, pilot lamp; And for partial discharges fault, although adopt the high-frequency ultrasonic detection means to detect, the accuracy of its detection and sensitivity can not be satisfactory; And for example, for the conductor joint heating fault, adopt the non-contact infrared measurement of directing pointing except opening the cabinet door, also there is no at present well other online detection means; Although there is unit to work out at position reload temperature detectors such as breaker of switch cabinet dolly contacts, sniffer and measurement means with the wireless outside emission of temperature signal, but this device shortcoming also clearly, during installation, equipment must have a power failure by the storehouse, the installment work cost is high, and because transformer and distribution power station/institute is the strong interference region of electromagnetic wave, reliability and the life-span of device itself also have problems.

So, how to obtain in time, at low cost the operation conditions of switchgear in cabinet or to find its misoperation information under the state of enclosed type switchboard assembly charging operation (this moment, the cabinet door of switch cubicle was in the closed position), to become the scene and move/patrol and examine problem demanding prompt solution in work.

Summary of the invention

Technical matters to be solved by this invention is to provide a kind of detection method of internal faults of switch cabinet, it is in when moving under the charging operation state at switch cubicle, adopt the gas collecting mode contactless with first and second loop electrified body, the common operation troubles of switchgear in cabinet can be detected delicately, and do not need during work operating switch cubicle is stopped labour, do not need the existing electric first and second loop equipment of switch cubicle is changed yet, implementation cost is cheap, does not affect the normal operation of existing equipment.

Technical scheme of the present invention is: a kind of detection method of internal faults of switch cabinet is provided, comprises the cabinet of switch cubicle, it is characterized in that:

Be in the switch cubicle of the charging operation under closed condition for the cabinet door, in the cabinet outside, utilize the through hole of switch cabinet body, extract the gas of cabinet inner space;

For gas in the cabinet that is drawn out of, adopt gas concentration measuring apparatus to carry out the measurement of concetration of certain specific characteristic gas;

Multichannel gas sensor module is set in described gas concentration measuring apparatus, the corresponding concentration of measuring a certain specific characteristic gas of each road gas sensor module, each road gas sensor module arranges a balanced bridge;

Described gas sensor module is transformed into electric signal with the concentration of various specific characteristic gases;

Adopt and to measure respectively or successively the method for the unbalance voltage of each balanced bridge, the variation of numerical value or numerical value by the unbalance voltage value comes the concentration of certain characteristic gas in corresponding reflection cabinet or the variation tendency of concentration;

Record respectively gas concentration measuring apparatus to the corresponding unbalance voltage value of various specific characteristic gas concentrations in cabinet and should be in the period the corresponding unbalance voltage value of the concentration of specific characteristic gas of the same race in surrounding air;

With same cabinet sometime in unbalance voltage value and the surrounding air of the section various specific characteristic gases of surveying the corresponding unbalance voltage value of specific characteristic gas of the same race and/or other different cabinets at one time section interior specific characteristic gas of the same race the measured value of corresponding unbalance voltage compare;

Find the switch cubicle of unbalance voltage value ANOMALOUS VARIATIONS;

According to unbalance voltage value abnormal change the kind of corresponding specific characteristic gas, correspondence draws corresponding accident kind and corresponding switch cubicle position in storehouse;

By extraction, measurement/analysis and the Data Comparison to charging operation state lower cabinet body inner space gas, each is represented that the unbalance voltage numerical value of certain characteristic gas concentration project compares with the numerical value of the unbalance voltage that represents this kind characteristic gas concentration project of ambient air and/or other switch cubicle positions in storehouse, and demonstrating inside has abnormal switch cubicle equipment position in storehouse.

Concrete, above-mentioned specific characteristic gas comprises ozone, sulfur hexafluoride and smog at least, discharge, sulfur hexafluoride gas that its corresponding accident is respectively inside switch cabinet leak and the conductor joint heating accident.

Be provided with gas sampling module, gas sensor module, display module and power module in above-mentioned gas concentration measuring apparatus; Described gas concentration measuring apparatus utilizes the gas sampling module to extract the gas of switch cabinet inner space, it is sent into the gas sampling part of gas sensor module, the unbalance voltage output signal of gas sensor module is sent into display module and is shown in real time, and described power module provides working power for gas sampling module, gas sensor module and display module.

Further, the through hole of described switch cabinet body comprises lockhole, handle hole or the louvre of switch cubicle.

Described gas sensor module comprises semiconductor gas sensor and/or solid electrolyte Electro-chemical Gas Sensor.

Compared with the prior art, advantage of the present invention is:

1. use the mode that in switch cubicle, air is analyzed that extracts, the common operation troubles of switchgear in cabinet can be detected delicately, and do not need during work operating switch cubicle is stopped labour, do not need the existing electric first and second loop equipment of switch cubicle is changed yet, implementation cost is cheap, does not affect the normal operation of existing equipment;

2. be in when moving under the charging operation state at switch cubicle, adopt non-electric-connecting mode, operation conditions to switch cubicle detects, the conductor joint heating of detecting air insulated switch cabinet inside, discharge and sulfur hexafluoride gas leakage etc. are abnormal delicately, be conducive to the early detection of fault and in time process, can effectively avoid the expansion of problem and spreading of fault, for condition has been created in the safety/stable operation of whole transformation and distribution system;

3. device adopts portable construction, is convenient to use under mobile status, can satisfy the regular visit requirement fully, and is easy to operate, detection accuracy is high.

Description of drawings

Fig. 1 is method step schematic block diagram of the present invention;

Fig. 2 is the inner structure schematic diagram of apparatus of the present invention;

Fig. 3 is the circuit diagram of the embodiment of the present invention.

In figure, 1 is device case, and 2 is air intake opening, and 3 are the gas sampling module, and 4 is the gas sensor module, and 5 is display module, and 6 is power module, and 7 is flexible sucker,

Embodiment

The present invention will be further described below in conjunction with accompanying drawing.

In Fig. 1, detection method of the present invention comprises the following steps: at least

A, be in the switch cubicle of the charging operation under closed condition for the cabinet door, outside at cabinet, utilize the through hole of switch cabinet body, extract the gas of cabinet inner space;

B, for gas in the cabinet that is drawn out of, adopt gas concentration measuring apparatus to carry out the measurement of concetration of certain specific characteristic gas;

Multichannel gas sensor module is set in C, described gas concentration measuring apparatus, the corresponding concentration of measuring a certain specific characteristic gas of each road gas sensor module, each road gas sensor module arranges a balanced bridge;

D, described gas sensor module are transformed into electric signal with the concentration of various specific characteristic gases;

E, adopt and to measure respectively or successively the method for the unbalance voltage of each balanced bridge, the variation of numerical value or numerical value by the unbalance voltage value comes the concentration of certain characteristic gas in corresponding reflection cabinet or the variation tendency of concentration;

F, respectively record gas concentration measuring apparatus to the corresponding unbalance voltage value of various specific characteristic gas concentrations in cabinet and should be in the period the corresponding unbalance voltage value of the concentration of specific characteristic gas of the same race in surrounding air;

G, with same cabinet sometime in unbalance voltage value and the surrounding air of the section various specific characteristic gases of surveying the corresponding unbalance voltage value of specific characteristic gas of the same race and/or other different cabinets at one time section interior specific characteristic gas of the same race the measured value of corresponding unbalance voltage compare;

The switch cubicle of H, discovery unbalance voltage value ANOMALOUS VARIATIONS;

I, according to unbalance voltage value abnormal change the kind of corresponding specific characteristic gas, correspondence draws corresponding accident kind and corresponding switch cubicle position in storehouse;

J, by extraction, measurement/analysis and Data Comparison to charging operation state lower cabinet body inner space gas, each is represented that the unbalance voltage numerical value of certain characteristic gas concentration project compares with the numerical value of the unbalance voltage that represents this kind characteristic gas concentration project of ambient air and/or other switch cubicle positions in storehouse, find that early inside switch cabinet is in accident or the early failure hidden danger in onset stage, the expansion of Accident prevention or further spread.

Gas sensor is a kind of sensor that detects specific gas.It mainly comprises semiconductor gas sensor, catalytic combustion type gas sensor and Electro-chemical Gas Sensor etc., and wherein the maximum of use are semiconductor gas sensors.Its application mainly contains: the detection of ethanol, detection of human oral cavity halitosis etc. in the detection of the detection of the detection of CO gas, the detection of methane gas, coal gas, freon (R11, R12), expiration.

It converts electric signal to gaseous species and with concentration dependent information, just can obtain with gas to be measured to have the relevant information of situation in environment according to the power of these electric signal, thereby can detect, monitor, report to the police; Can also form automatic detection, control and warning system by interface circuit and computing machine.

Further, in technical scheme of the present invention, described specific characteristic gas comprises ozone, sulfur hexafluoride and smog at least, and discharge, sulfur hexafluoride gas that its corresponding accident is respectively inside switch cabinet leak and the conductor joint heating accident.

Be provided with gas sampling module, at least one road gas sensor module, display module and power module in described gas concentration measuring apparatus; Described gas concentration measuring apparatus utilizes the gas sampling module to extract the gas of switch cabinet inner space, it is sent into the gas sampling part of gas sensor module, the unbalance voltage output signal of gas sensor module is sent into display module and is shown in real time, and described power module provides working power for gas sampling module, gas sensor module and display module.

The through hole of described switch cabinet body comprises lockhole, handle hole or the louvre of switch cubicle.

Described gas sensor module comprises semiconductor gas sensor and/or solid electrolyte Electro-chemical Gas Sensor.

In the technical program, adopt the mode that in switch cubicle, air carries out the qualitative/quantitative analysis that extracts, conductor joint heating, discharge and the sulfur hexafluoride gas that switchgear in cabinet can be detected delicately leak three kinds of common operation troubless, and do not need during work operating switch cubicle is stopped labour, do not need the existing electric first and second loop equipment of switch cubicle is changed yet, implementation cost is cheap, does not affect the normal operation of existing equipment, is specially adapted to those power transmission and transformation institutes that has built up/stand.

Simultaneously, be in when moving under the charging operation state at switch cubicle, adopt non-electric-connecting mode, operation conditions to switch cubicle detects, the abnormal occurrence of detecting air insulated switch cabinet inside or accident sign in advance delicately, be conducive to the early detection of fault and in time process, can effectively avoid the expansion of problem and spreading of fault, for condition has been created in the safety/stable operation of whole transformation and distribution system.

In Fig. 2, sniffer of the present invention comprises a device case 1 with air intake opening 2 and venthole (not shown); Be provided with gas sampling module 3, gas sensor module 4, display module 5 and power module 6 in housing.

The air intake opening of device case is connected with through hole (not shown) gas circuit on the air insulation switch cabinet; The venthole of device case communicates with atmosphere.

The gas sensor module is carried out gas circuit with the inner space of air insulation switch cabinet and is connected through the through hole on gas sampling module, device case air intake opening and air insulation switch cabinet.

Further, at device case air intake opening and the end that through hole gas circuit on the air insulation switch cabinet is connected, a flexible sucker 7 can be set, the air intake opening of device case is on flexible sucker is fixed on through hole on the air insulation switch cabinet.

Perhaps, on device case air intake opening and air insulation switch cabinet between through hole, one sampling pipe is set, the device case air intake opening is connected with through hole gas circuit on the air insulation switch cabinet through sampling pipe, an end that is connected with through hole on the air insulation switch cabinet at sampling pipe, one flexible sucker is set, and sampling pipe is on flexible sucker is fixed on through hole on the air insulation switch cabinet.

The detection signal output terminal of gas sensor module is electrically connected to the measuring-signal input end of display module.

The power output end of power module is electrically connected to the power input of gas sampling module, gas sensor module and display module.

Gas sampling module in this sniffer comprises vacuum pump and control knob switch, the gas suction inlet of described vacuum pump is connected with the sampling pipe gas circuit through the air intake opening of device case, and the gas vent of described vacuum pump is connected with the gas sampling part gas circuit of gas sensor module; Described control knob switch series is connected between the power output end and vacuum pump winding coil of power module.

Gas sensor module in this sniffer is gas sensor.

Concrete, gas sensor comprises ozone sensor, sulfur hexafluoride sensor, air mass sensor, hydrogen sulfide sensor and/or smoke transducer.

Display module in this sniffer comprises voltage table and input selection change-over switch, and the measuring voltage input end of voltage table is electrically connected to the measuring-signal output terminal of gas sensor module through the input selection change-over switch.

Power module in this sniffer comprises accumulator/dry cell batteries, and is concrete, and power module comprises accumulator/dry cell batteries, reverse-connection preventing circuit, power switch, integrated regulator and charging socket.

Through hole on aforementioned air insulation switch cabinet comprises lockhole, handle hole or the louvre of switch cubicle.

In Fig. 3, the electric circuit of device of the present invention part is made of gas sampling module, gas sensor module, display module and power module successively.

Consist of upward from circuit, gas sampling module 3 comprises vaccum pump motor M and control knob switch S A3; Wherein, after the control knob switch is connected in series with the winding coil of vaccum pump motor and the positive and negative power output end of power module be connected respectively.

Air-sensitive gas sensor module 4 comprises ozone sensor testing circuit, sulfur hexafluoride sensor detection circuit, air mass sensor testing circuit, hydrogen sulfide sensor testing circuit and smoke transducer testing circuit; Wherein:

the ozone sensor testing circuit comprises ozone sensor CG1, the first resistance R 1, the second current regulator diode D2 and the 7th adjustable resistance R7, the 1st pin of ozone sensor is connected through the positive pole of the first resistance with the power module power output end, the 2nd pin of ozone sensor through the 7th adjustable resistance be connected the positive pole of current regulator diode with the power module power output end and be connected, the 3rd pin of ozone sensor is connected with the negative pole of power module power output end, the link of its 7th adjustable resistance and the second current regulator diode, consist of the detection signal output terminal of ozone sensor testing circuit.

the sulfur hexafluoride sensor detection circuit comprises sulfur hexafluoride sensor CG2, the second resistance R 2, the 3rd current regulator diode D3 and the 8th adjustable resistance R8, the 1st pin of sulfur hexafluoride sensor is connected through the positive pole of the second resistance with the power module power output end, the 2nd pin of sulfur hexafluoride sensor is connected with the positive pole of the 3rd current regulator diode with the power module power output end through the 8th adjustable resistance, the 3rd pin of sulfur hexafluoride sensor is connected with the negative pole of power module power output end, the link of its 8th adjustable resistance and the 3rd current regulator diode, consist of the detection signal output terminal of sulfur hexafluoride sensor detection circuit.

The air mass sensor testing circuit comprises air mass sensor CG3, the 5th resistance R 5 and the tenth resistance R 10, two fire end pins of air mass sensor respectively with the corresponding connection of positive and negative electrode of power module power output end, the 3rd pin of air mass sensor is connected through the positive pole of the 5th resistance with the power module power output end, the 4th pin of air mass sensor is connected with the negative pole of power module power output end, after its air mass sensor the 3rd pin serial connection the tenth resistance, consist of the detection signal output terminal of air mass sensor testing circuit.

the hydrogen sulfide sensor testing circuit comprises hydrogen sulfide sensor CG4, the 3rd resistance R 3, the 11 resistance R 11 and the 4th current regulator diode D4, the 1st pin of hydrogen sulfide sensor is connected through the positive pole of the 3rd resistance with the power module power output end, the 2nd pin of hydrogen sulfide sensor is connected through the positive pole of the 4th current regulator diode with the power module power output end, the 3rd pin of hydrogen sulfide sensor is connected with the negative pole of power module power output end, after its hydrogen sulfide sensor the 3rd pin serial connection the 11 resistance, consist of the detection signal output terminal of hydrogen sulfide sensor testing circuit.

The smoke transducer testing circuit comprises smoke transducer CG5, the 4th resistance R 4, the 6th resistance R 6 and the 12 resistance R 12, the 1st pin of smoke transducer is connected through the positive pole of the 4th resistance with the power module power output end, the 2nd pin of smoke transducer is connected through the positive pole of the 6th resistance with the power module power output end, the 3rd pin of smoke transducer is connected with the negative pole of power module power output end, after the 2nd pin serial connection the 12 resistance of its smoke transducer, consist of the detection signal output terminal of smoke transducer testing circuit.

The detection signal output terminal of ozone sensor testing circuit is connected with the 1st measuring-signal input end of input selection change-over switch SA2 in display module.

The detection signal output terminal of sulfur hexafluoride sensor detection circuit is connected with the 2nd measuring-signal input end of input selection change-over switch SA2 in display module.

The detection signal output terminal of air mass sensor testing circuit, hydrogen sulfide sensor testing circuit and smoke transducer testing circuit also connects, and is connected with the 3rd measuring-signal input end of input selection change-over switch SA2 in display module.

display module 5 comprises input selection change-over switch SA2, voltage table V, the 13 resistance R 13, the 14 resistance R 14 and the 9th adjustable resistance R9, the 1st measuring-signal input end of input selection change-over switch is connected with the detection signal output terminal of ozone sensor testing circuit, the 2nd measuring-signal input end of input selection change-over switch is connected with the detection signal output terminal of sulfur hexafluoride sensor detection circuit, the 3rd measuring-signal input end and the air mass sensor testing circuit of input selection change-over switch, the hydrogen sulfide sensor testing circuit is connected the detection signal output terminal and is connected with the smoke transducer testing circuit, be connected through the negative pole of the 9th adjustable resistance with the power module power output end simultaneously, 2 working power input ends of voltage table respectively with the power module power output end just, negative pole is corresponding to be connected, the first input signal end of voltage table is connected with the detection signal output terminal of input selection change-over switch, the second input signal end of voltage table is connected through the positive pole of the 13 resistance with the power module power output end, the second input signal end of voltage table also is connected through the negative pole of the 14 resistance with the power module power output end simultaneously.

power module 6 comprises electric battery B, isolating diode D1, charging socket K, integrated regulator IC, power switch SA1 and filter capacitor C1, just be attempted by electric battery after charging socket serial connection isolating diode, between negative pole end, the positive pole of electric battery is connected with the power input of integrated regulator through power switch, the power output end of integrated regulator consists of the positive pole of power module power output end, the earth terminal of integrated regulator is connected with the negative pole of electric battery, consist of the negative pole of power module power output end, filter capacitor just is being attempted by the power module power output end, between negative pole end.

On the other hand, on circuit function, gas sampling module 3 comprises vaccum pump motor M and control knob switch S A3, and the power input of vaccum pump motor M is connected with the power output end of power module with pushbutton switch SA3 series connection is rear.

Gas sensor module 4 comprises ozone sensor testing circuit, sulfur hexafluoride sensor detection circuit, air mass sensor testing circuit, hydrogen sulfide sensor testing circuit and smoke transducer testing circuit; Wherein:

The output terminal of ozone sensor CG1 be connected in parallel on the power circuit power output end after ozone sensor output terminal current regulator diode D2 and zero potentiometer R7 connect, the auxiliary electrical source of ozone sensor CG1 and the power output end that is connected in parallel on power circuit after accessory power supply resistance R 1 is connected.

The output terminal of sulfur hexafluoride sensor CG2 be connected in parallel on the power circuit power output end after current regulator diode D3 and zero potentiometer R8 connect, the auxiliary electrical source of sulfur hexafluoride sensor CG2 and the power output end that is connected in parallel on power circuit after accessory power supply resistance R 2 is connected.

The output terminal of air mass sensor CG3 be connected in parallel on the power circuit power output end after output terminal resistance R 5 is connected, the auxiliary electrical source of air mass sensor CG3 is connected in parallel on the power output end of power circuit.

The output terminal of hydrogen sulfide sensor CG4 and smoke transducer CG5 is connected in parallel on the power circuit power output end respectively with after current regulator diode D4 and output terminal resistance R 6 connect, the auxiliary electrical source of hydrogen sulfide sensor CG4 and smoke transducer CG5 respectively with the power output end that is connected in parallel on power circuit after resistance R 3 and resistance R 4 are connected; Zero potentiometer R7 and R8 and current regulator diode D2 and D3 are connected in series the first selected element 1 and the second selected element 2 that a little meets respectively change-over switch SA2; The output terminal of air mass sensor, hydrogen sulfide sensor and smoke transducer meets respectively equalizing resistance R10, equalizing resistance R11 and equalizing resistance R12, the other end of equalizing resistance R10, equalizing resistance R11 and equalizing resistance R12 all is connected with the 3rd selected element 3 of change-over switch SA2, and connects power cathode by zero potentiometer R9.

Hydrogen sulfide sensor in this circuit, sulfur hexafluoride sensor and ozone sensor suggestion select the solid electrolyte Electro-chemical Gas Sensor to be advisable.

In display module 5, be connected in parallel on the power circuit power output end after divider resistance R13 and divider resistance R14 series connection, divider resistance R13 and divider resistance R14 are connected in series the signal input part that a little meets voltage table V, another signal input part of voltage table V is connected with the common point of change-over switch SA2, the working power input end of voltage table V is connected in parallel on the power output end of power circuit, and voltage table V selects the digital display type voltage table.

In power module 6, the positive pole of charging socket K is connected with battery B by isolating diode D1, the positive pole of battery B is connected with the input end of integrated regulator IC by power switch SA1, be parallel with filter capacitor C1 between the output terminal of integrated regulator IC and adjustment end, the adjustment end of integrated regulator IC is connected with the negative pole of battery B and charging socket K.In said elements, when diode D1 is used for by charging socket, self-contained battery being charged, charger polarity is anti-inserted; Integrated regulator IC adopts 7805 types, is used for cell voltage is stabilized in 5V, gives sensor power supplies at different levels; C1 is filter capacitor, is used for stable dc power supply voltage.

in addition, clearly, gas sensor module in this circuit is used for various gas concentration signals are transformed into electric signal, in this modular circuit, resistance R 1, R2, R3, R4 are the accessory power supply resistance of sensor, are used to the electrolyte of sensor internal or accessory power supply that galvanic current stream is provided, diode D2, D3, D4 are the output terminal current regulator diodes of sensor, because ozone, sulfur hexafluoride and hydrogen sulfide sensor in this circuit are exported for deciding electric current, therefore its output end current need to be fixed by current regulator diode, provides convenience for taking out signal voltage simultaneously, resistance R 5, R6 are respectively the output terminal pull-up resistors of peculiar smell sensor and smoke transducer, provide convenience for taking out signal voltage, resistance R 10, R11, R12 is used for surveying the peculiar smell of heating, sulfuretted hydrogen, the output terminal of smoke transducer connects to simplify circuit, this is because various gas sensor output resistances all are inverse ratio with characteristic gas concentration, resistance R 10, R11, R12 three's resistance is identical, its resistance is much larger than the maximum output resistance of three sensors, a in this master drawing, b, the current potential that c is 3 can show by a bit (the 3rd selected element 3 of the selector switch SA2 in figure), the current potential of 3 in figure approximates a, b, the mean value of c three point voltages, resistance diminishes as long as there is a sensor to experience abnormal, the current potential of 3 will descend, resistance R 13, R14 and diode D2, D3, D4 and resistance R 5, R6 consist of balanced bridge, so just can detect in high sensitivity the variation of each sensor output resistance, V is digital voltmeter, is used for the unbalance voltage that shows balanced bridge directly perceived, resistance R 7, R8, R9 are used for zeroing to obtain reference gas concentration, are convenient to detect.

Owing to also there being the characteristic gas such as some particles, sulfuretted hydrogen, ozone in air, and various places are different, therefore can first obtain outside air by the gas sampling module before the detector switch cabinet equipment, surrounding air is set as reference value, regulate respectively adjustable resistance (potentiometer) R7, R8, R9 to bridge balance, voltage table V non-metering, detector switch cabinet equipment again, just can compare facilities each characteristic gas of inner air and outside air in the difference of characteristic gas on concentration or content, thereby checkout equipment more easily.

Test item change-over switch SA2, be used for switching " heating ", " SF6 leakage ", " discharge " three kinds of test items, wherein the first selected element 1 of change-over switch is for detecting " discharge " fault, the second selected element 2 is for detecting " SF6(sulfur hexafluoride) leak " fault, and the 3rd selected element 3 is for detecting " conductor joint heating " fault.

The exhaust end of the gas sampling assembly 2 in this device partly is connected with the gas sampling of gas sensor module 3.SA3 wherein presses the running of SA3 vacuum pump for getting the gas pushbutton switch, sucks gas from the external world, is blown into the gas sensor module from exhaust end, for the sensor judgement.

during actual the use, the switch S that switches on power A1, device is started working, need this moment to wait for about 1 minute, treat that all the sensors preheating is complete, after entering stable state, can begin to measure, the output resistance variation of each sensor is reflected on voltage table by balanced bridge, in order to make the data that record directly perceived, can first return to zero respectively selecting change-over switch to cut to each position, then the air hatch of sniffer is aimed at the lockhole of door of switch cabinet, handle hole or louvre, press SA3 connection vacuum pump air-breathing, device just can show the unbalance voltage of the balanced bridge of corresponding various characteristic gas concentration, the unbalance voltage size of each project is compared with the numerical value of surrounding air and other switch cubicle positions in storehouse, just can clearly show inside abnormal switch cubicle equipment position in storehouse is arranged.

Because adopting non-electric-connecting gas analysis mode, the present invention gathers the running state parameter of measurand, the modal three kinds of operation troubless of switchgear in cabinet can be detected delicately, do not need operating switch cubicle is stopped labour when carrying out testing, do not affect the normal operation of existing equipment, be conducive to the early detection of fault and in time process, can effectively avoid the expansion of problem and spreading of fault, for condition has been created in the safety/stable operation of whole transformation and distribution system.

Simultaneously, this device adopts the portable construction design, be convenient to use under mobile status, under the state of enclosed type switchboard assembly charging operation, can obtain in time, at low cost the operation conditions of switchgear in the cabinet of a plurality of air insulation switch cubicle positions in storehouse " one-to-many " or find its misoperation information, the detection implementation cost is cheap, and detection accuracy is high, has solved that not having a power failure of existing equipment undergoes technological transformation and the problems such as perfect of device monitoring means.

The present invention can be widely used in the operation monitoring field of various enclosed type combined electrical apparatuses/air insulation switch cubicle.

Claims (4)

1. the detection method of an internal faults of switch cabinet comprises it is characterized in that the cabinet of switch cubicle:
Be in the switch cubicle of the charging operation under closed condition for the cabinet door, in the cabinet outside, utilize the through hole of switch cabinet body, extract the gas of cabinet inner space;
For gas in the cabinet that is drawn out of, adopt gas concentration measuring apparatus to carry out the measurement of concetration of certain specific characteristic gas;
Multichannel gas sensor module is set in described gas concentration measuring apparatus, the corresponding concentration of measuring a certain specific characteristic gas of each road gas sensor module, each road gas sensor module arranges a balanced bridge;
Described gas sensor module is transformed into electric signal with the concentration of various specific characteristic gases;
Adopt and to measure respectively or successively the method for the unbalance voltage of each balanced bridge, the variation of numerical value or numerical value by the unbalance voltage value comes the concentration of certain characteristic gas in corresponding reflection cabinet or the variation tendency of concentration;
Record respectively gas concentration measuring apparatus to the corresponding unbalance voltage value of various specific characteristic gas concentrations in cabinet and should be in the period the corresponding unbalance voltage value of the concentration of specific characteristic gas of the same race in surrounding air;
With same cabinet sometime in unbalance voltage value and the surrounding air of the section various specific characteristic gases of surveying the corresponding unbalance voltage value of specific characteristic gas of the same race and/or other different cabinets at one time section interior specific characteristic gas of the same race the measured value of corresponding unbalance voltage compare;
Find the switch cubicle of unbalance voltage value ANOMALOUS VARIATIONS;
According to unbalance voltage value abnormal change the kind of corresponding specific characteristic gas, correspondence draws corresponding accident kind and corresponding switch cubicle position in storehouse;
By extraction, measurement/analysis and the Data Comparison to charging operation state lower cabinet body inner space gas, each is represented that the unbalance voltage numerical value of certain characteristic gas concentration project compares with the numerical value of the unbalance voltage that represents this kind characteristic gas concentration project of ambient air and/or other switch cubicle positions in storehouse, and demonstrating inside has abnormal switch cubicle equipment position in storehouse.
2. according to the detection method of internal faults of switch cabinet claimed in claim 1, it is characterized in that described specific characteristic gas comprises ozone, sulfur hexafluoride and smog at least, discharge, sulfur hexafluoride gas that its corresponding accident is respectively inside switch cabinet leak and the conductor joint heating accident.
3. according to the detection method of internal faults of switch cabinet claimed in claim 1, it is characterized in that being provided with in described gas concentration measuring apparatus gas sampling module, gas sensor module, display module and power module; Described gas concentration measuring apparatus utilizes the gas sampling module to extract the gas of switch cabinet inner space, it is sent into the gas sampling part of gas sensor module, described gas sensor module is used for various gas concentration signals are transformed into electric signal, the unbalance voltage output signal of gas sensor module is sent into display module and is shown in real time, and described power module provides working power for gas sampling module, gas sensor module and display module.
4. according to the detection method of claim 1 or 3 described internal faults of switch cabinet, it is characterized in that the through hole of described switch cabinet body, comprise lockhole, handle hole or the louvre of switch cubicle; Described gas sensor module comprises semiconductor gas sensor and/or solid electrolyte Electro-chemical Gas Sensor.
CN 201010260267 2010-08-23 2010-08-23 Detection method of internal faults of switch cabinet CN101968459B (en)

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