CN201803970U - Internal fault detector for switch cabinet - Google Patents
Internal fault detector for switch cabinet Download PDFInfo
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- CN201803970U CN201803970U CN2010205020456U CN201020502045U CN201803970U CN 201803970 U CN201803970 U CN 201803970U CN 2010205020456 U CN2010205020456 U CN 2010205020456U CN 201020502045 U CN201020502045 U CN 201020502045U CN 201803970 U CN201803970 U CN 201803970U
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- 238000001514 detection method Methods 0.000 claims abstract description 103
- 238000009413 insulation Methods 0.000 claims abstract description 21
- 239000007789 gas Substances 0.000 claims description 103
- 238000005070 sampling Methods 0.000 claims description 37
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims description 33
- 229910000037 hydrogen sulfide Inorganic materials 0.000 claims description 33
- 229910018503 SF6 Inorganic materials 0.000 claims description 32
- 239000000779 smoke Substances 0.000 claims description 32
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 claims description 32
- 229960000909 sulfur hexafluoride Drugs 0.000 claims description 32
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 30
- 238000005259 measurement Methods 0.000 claims description 16
- 239000003990 capacitor Substances 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000004804 winding Methods 0.000 claims description 5
- 238000002955 isolation Methods 0.000 claims description 4
- 230000017525 heat dissipation Effects 0.000 claims description 3
- 239000004047 hole gas Substances 0.000 abstract description 3
- 238000012544 monitoring process Methods 0.000 abstract description 3
- 239000003570 air Substances 0.000 description 61
- 230000000087 stabilizing effect Effects 0.000 description 8
- 238000009826 distribution Methods 0.000 description 6
- 230000002159 abnormal effect Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 238000003860 storage Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000004868 gas analysis Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000007784 solid electrolyte Substances 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
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Abstract
The utility model relates to an internal fault detector for a switch cabinet, which is provided with a portable shell with a gas inlet, wherein a gas sampler, a gas sensor, a display module and a power supply module are arranged in the shell; the gas inlet of the shell is connected with a through hole gas channel in the air insulation switch cabinet body; the gas sensor is connected with the inner space of the air insulation switch cabinet body through the gas channel via the gas sampler, the gas inlet of the shell and the through hole in the air insulation switch cabinet body; and the detection signal output end of the gas sensor is electrically connected with the measured signal input end of the display module. When the switch cabinet operates in the electrified state, the detector can sensitively detect common operation faults of the switching device in the cabinet. When the detector operates, the user does not need to stop the switch cabinet in operation, or modify the primary and secondary electrical loops of the current switch cabinet. Thus, the utility model has the advantage of low implementation cost, and does not affect the normal operation of the existing device. The utility model can be widely used in the field of operation monitoring of various closed-type combined electric appliances/air insulation switch cabinets.
Description
Technical Field
The utility model belongs to become the distribution field, especially, relate to a fault detection device for electric energy transport/distribution equipment.
Background
With the rapid development of economy in China, the basic power industry has also been rapidly developed for a long time. As one of important devices in electric power construction, the application of the enclosed type combined electrical apparatus is increasingly popularized, and meanwhile, higher requirements are provided for safe/stable operation of the enclosed type combined electrical apparatus.
The air-insulated switch cabinet is one of closed combined electrical appliances, and is widely applied to 10-40.5 KV switch equipment.
However, due to the characteristics of the enclosed box structure, the air-insulated switchgear has certain disadvantages, mainly because the internal electrical abnormality is difficult to detect in the early stage. If the switch device cannot be found and disposed in time, the switch device and the accessory parts thereof are usually damaged/burned, and in a serious case, the operation of the whole system and the personal/equipment safety of the whole substation/station are even affected.
Specifically, the air-insulated switchgear generally adopts a box structure, all elements of the power distribution equipment are placed inside the cabinet body, and the problem brought by the structural form is that the operation condition of the equipment inside the cabinet body cannot be known in time/intuitively from the outside of the cabinet body (the cabinet door of the cabinet body is in a closed state during normal live operation), the most common faults of primary equipment, such as joint heating, sulfur hexafluoride gas leakage, abnormal partial discharge and the like cannot be found or expressed in time outside the cabinet in an intuitive and obvious manner, and when the faults are found, serious consequences are often caused.
For example, for leakage faults of sulfur hexafluoride insulating gas, the leakage faults can be indirectly displayed through the light word board and the indicator lamp only when the pressure is lower than an alarm or locking value; for the partial discharge fault, although the high-frequency ultrasonic detection means can be used for detecting, the detection accuracy and sensitivity are not satisfactory; for another example, for the heating fault of the joint, except for the non-contact infrared measurement of directly aiming when the cabinet door is opened, no other good online detection means exists at present; although some units have already researched a detection device and a measurement means for installing a temperature detector at the contact of a switch cabinet breaker trolley and the like and transmitting a temperature signal to the outside in a wireless manner, the device has obvious defects, equipment has to be powered off bin by bin during installation, the installation work cost is high, and the reliability and the service life of the device are also problematic due to the fact that a power transformation and distribution station/substation is an area with strong electromagnetic wave interference.
Therefore, how to obtain the operation condition of the switch equipment in the closed combined switch cabinet in time and at low cost or find the abnormal operation information thereof in the state of live operation (at the moment, the cabinet door of the switch cabinet is in the closed position) of the closed combined switch cabinet becomes a problem to be solved urgently in the field operation/inspection work.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a cubical switchboard internal fault detection device is provided, it adopts the mode of non-electricity connection when the cubical switchboard is in under the live working state, can detect switchgear's in the cabinet common operation trouble sensitively, and the during operation need not stop the labour to the cubical switchboard in service, also need not change current cubical switchboard electric one, secondary circuit equipment, implements low cost, does not influence the normal operating of current equipment.
The technical scheme of the utility model is that: the utility model provides a cubical switchboard internal fault detection device which characterized by: arranging a portable device shell with an air inlet and an air outlet; a gas sampling module, a gas sensor module, a display module and a power supply module are arranged in the shell; an air inlet of the device shell is connected with a through hole air passage on the air insulation switch cabinet body; the air outlet of the device shell is communicated with the atmosphere; the gas-sensitive sensor module is in gas circuit connection with the inner space of the air-insulated switch cabinet body through the gas sampling module, the air inlet of the device shell and the through hole on the air-insulated switch cabinet body; the detection signal output end of the gas sensor module is electrically connected with the measurement signal input end of the display module; and the power output end of the power supply module is electrically connected with the power input ends of the gas sampling module, the gas sensor module and the display module.
Furthermore, a sampling pipe is arranged between the air inlet of the device shell and the through hole in the air insulation switch cabinet body, and the air inlet of the device shell is connected with the air passage of the through hole in the air insulation switch cabinet body through the sampling pipe; one end that the sampling pipe is connected with the last through-hole gas circuit of the air insulation cubical switchboard body sets up a flexible sucking disc, and the sampling pipe is fixed on the through-hole on the air insulation cubical switchboard body through flexible sucking disc.
Specifically, the gas sampling module comprises a vacuum pump and a control button switch, a gas suction inlet of the vacuum pump is connected with a gas path of a sampling pipe through a gas inlet of the device shell, and a gas outlet of the vacuum pump is connected with a gas sampling part of the gas sensor module through a gas path; the control button switch is connected in series between the power output end of the power supply module and the winding coil of the vacuum pump.
The gas sensor module is a gas sensor.
The gas sensor comprises an ozone sensor, a sulfur hexafluoride sensor, an air quality sensor, a hydrogen sulfide sensor and/or a smoke sensor.
The display module comprises a voltmeter and an input selection switch, and a measurement voltage input end of the voltmeter is electrically connected with a measurement signal output end of the gas sensor module through the input selection switch.
The power module includes a battery/dry cell stack.
The power module comprises a storage battery/dry battery pack, an anti-reverse connection circuit, a power switch, a voltage stabilizing integrated circuit and a charging socket.
The through hole on the air insulation switch cabinet body comprises a lock hole, an operation hole or a radiating hole of the switch cabinet.
More specifically, the gas sampling module comprises a vacuum pump motor and a control button switch; the control button switch is connected with a winding coil of the vacuum pump motor in series and then is correspondingly connected with the positive power supply output end and the negative power supply output end of the power supply module respectively.
The gas sensor module comprises an ozone sensor detection circuit, a sulfur hexafluoride sensor detection circuit, an air quality sensor detection circuit, a hydrogen sulfide sensor detection circuit and a smoke sensor detection circuit; wherein:
the ozone sensor detection circuit comprises an ozone sensor, a first resistor, a second constant current diode and a seventh adjustable resistor, wherein a1 st pin of the ozone sensor is connected with the anode of the power supply output end of the power supply module through the first resistor, a2 nd pin of the ozone sensor is connected with the anode of the power supply output end of the power supply module through the seventh adjustable resistor and the second constant current diode, a3 rd pin of the ozone sensor is connected with the cathode of the power supply output end of the power supply module, and the seventh adjustable resistor and the connecting end of the second constant current diode form a detection signal output end of the ozone sensor detection circuit.
The sulfur hexafluoride sensor detection circuit comprises a sulfur hexafluoride sensor, a second resistor, a third constant current diode and an eighth adjustable resistor, wherein a1 st pin of the sulfur hexafluoride sensor is connected with the anode of the power supply output end of the power supply module through the second resistor, a2 nd pin of the sulfur hexafluoride sensor is connected with the anode of the power supply output end of the power supply module through the eighth adjustable resistor and the third constant current diode, a3 rd pin of the sulfur hexafluoride sensor is connected with the cathode of the power supply output end of the power supply module, and the eighth adjustable resistor and the connecting end of the third constant current diode form a detection signal output end of the sulfur hexafluoride sensor detection circuit.
The air quality sensor detection circuit comprises an air quality sensor, a fifth resistor and a tenth resistor, wherein two heating end pins of the air quality sensor are respectively connected with the positive pole and the negative pole of the power supply output end of the power supply module in a corresponding mode, the 3 rd pin of the air quality sensor is connected with the positive pole of the power supply output end of the power supply module through the fifth resistor, the 4 th pin of the air quality sensor is connected with the negative pole of the power supply output end of the power supply module, and the 3 rd pin of the air quality sensor is connected with the tenth resistor in series to form a detection signal output end of the air quality sensor detection circuit.
The detection circuit of the hydrogen sulfide sensor comprises a hydrogen sulfide sensor, a third resistor, an eleventh resistor and a fourth constant current diode, wherein a1 st pin of the hydrogen sulfide sensor is connected with the anode of the power supply output end of the power supply module through the third resistor, a2 nd pin of the hydrogen sulfide sensor is connected with the anode of the power supply output end of the power supply module through the fourth constant current diode, a3 rd pin of the hydrogen sulfide sensor is connected with the cathode of the power supply output end of the power supply module, and a3 rd pin of the hydrogen sulfide sensor is connected with the eleventh resistor in series to form a detection signal output end of the detection circuit of the hydrogen sulfide sensor.
The smoke sensor detection circuit comprises a smoke sensor, a fourth resistor, a sixth resistor and a twelfth resistor, wherein the 1 st pin of the smoke sensor is connected with the anode of the power supply output end of the power supply module through the fourth resistor, the 2 nd pin of the smoke sensor is connected with the anode of the power supply output end of the power supply module through the sixth resistor, the 3 rd pin of the smoke sensor is connected with the cathode of the power supply output end of the power supply module, and the 2 nd pin of the smoke sensor is connected with the twelfth resistor in series to form a detection signal output end of the smoke sensor detection circuit.
And the detection signal output end of the ozone sensor detection circuit is connected with the 1 st measurement signal input end of the input selection selector switch in the display module.
And the detection signal output end of the sulfur hexafluoride sensor detection circuit is connected with the No. 2 measurement signal input end of the input selection selector switch in the display module.
And the detection signal output ends of the air quality sensor detection circuit, the hydrogen sulfide sensor detection circuit and the smoke sensor detection circuit are connected in parallel and are connected with the No. 3 measurement signal input end of the input selection selector switch in the display module.
The display module comprises an input selection change-over switch, a voltmeter, a thirteenth resistor, a fourteenth resistor and a ninth adjustable resistor, wherein the 1 st measuring signal input end of the input selection change-over switch is connected with the detecting signal output end of the ozone sensor detecting circuit, the 2 nd measuring signal input end of the input selection change-over switch is connected with the detecting signal output end of the sulfur hexafluoride sensor detecting circuit, the 3 rd measuring signal input end of the input selection change-over switch is connected with the detecting signal output ends of the air quality sensor detecting circuit, the hydrogen sulfide sensor detecting circuit and the smoke sensor detecting circuit, and is connected with the negative pole of the power supply output end of the power supply module through the ninth adjustable resistor, the 2 working power supply input ends of the voltmeter are respectively correspondingly connected with the positive pole and the negative pole of the power supply output end of the power supply module, the first input signal end of the voltmeter is connected with the detecting signal output, and a second input signal end of the voltmeter is connected with the anode of the power supply output end of the power supply module through a thirteenth resistor, and is also connected with the cathode of the power supply output end of the power supply module through a fourteenth resistor.
The power module include the group battery, keep apart the diode, charging socket, the steady voltage integrated circuit, switch and filter capacitor, charging socket concatenates behind the isolation diode and connects in the group battery just, between the negative pole end, the positive pole of group battery is connected through switch and steady voltage integrated circuit's power input end, steady voltage integrated circuit's power output end constitutes power module power output end's positive pole, steady voltage integrated circuit's earthing terminal is connected with the negative pole of group battery, constitute power module power output end's negative pole, filter capacitor connects in parallel between power module power output end just, between the negative pole end.
Compared with the prior art, the utility model has the advantages that:
1. the common operation faults of the switch equipment in the switch cabinet can be sensitively detected by using a mode of extracting air in the switch cabinet for analysis, the switch cabinet in operation does not need to be out of service during working, and the electric primary and secondary loop equipment of the existing switch cabinet does not need to be changed, so that the implementation cost is low, and the normal operation of the existing equipment is not influenced;
2. when the switch cabinet runs in a live running state, the running state of the switch cabinet is detected in a non-electric connection mode, so that the abnormity of joint heating, discharging, sulfur hexafluoride gas leakage and the like in the air insulation switch cabinet can be sensitively detected, the early discovery and timely treatment of faults are facilitated, the expansion of problems and the spread of the faults can be effectively avoided, and conditions are created for the safe/stable running of the whole power transformation and distribution system;
3. the device adopts portable structure, is convenient for use under the mobile state, can satisfy the requirement of regularly patrolling and examining completely, convenient operation, detection degree of accuracy height.
Drawings
Fig. 1 is a schematic view of the internal structure of the present invention;
fig. 2 is a circuit diagram of an embodiment of the present invention.
In the figure, 1 is a device shell, 2 is an air inlet, 3 is a gas sampling module, 4 is a gas sensor module, 5 is a display module, 6 is a power supply module, 7 is a flexible sucker,
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
In fig. 1, the device comprises a device housing 1 with an inlet 2 and an outlet (not shown); a gas sampling module 3, a gas sensor module 4, a display module 5 and a power module 6 are arranged in the housing.
The air inlet of the device shell is connected with a through hole (not shown in the figure) on the air insulation switch cabinet body through an air channel; the air outlet of the device shell is communicated with the atmosphere.
The gas sensor module is connected with the inner space of the air-insulated switch cabinet body through a gas sampling module, a device shell air inlet and a through hole in the air-insulated switch cabinet body in a gas path mode.
Furthermore, a flexible sucker 7 can be arranged at one end of the air inlet of the device shell, which is connected with the air passage of the through hole in the air-insulated switch cabinet body, and the air inlet of the device shell is fixed on the through hole in the air-insulated switch cabinet body through the flexible sucker.
Or a sampling pipe can be arranged between the air inlet of the device shell and the through hole in the air insulation switch cabinet body, and the air inlet of the device shell is connected with the air passage of the through hole in the air insulation switch cabinet body through the sampling pipe.
One end that the through-hole gas circuit is connected on the sampling pipe and the air insulation switch cabinet body sets up a flexible sucking disc 7, and the sampling pipe is fixed on the through-hole on the air insulation switch cabinet body through flexible sucking disc.
The detection signal output end of the gas sensor module is electrically connected with the measurement signal input end of the display module; and the power output end of the power supply module is electrically connected with the power input ends of the gas sampling module, the gas sensor module and the display module.
The gas sampling module in the device comprises a vacuum pump and a control button switch, wherein a gas suction inlet of the vacuum pump is connected with a gas path of a sampling pipe through a gas inlet of a device shell, and a gas outlet of the vacuum pump is connected with a gas sampling part of a gas-sensitive sensor module through a gas path; the control button switch is connected in series between the power output end of the power supply module and the winding coil of the vacuum pump.
The gas sensor module in the device is a gas sensor. Specifically, the gas sensor comprises an ozone sensor, a sulfur hexafluoride sensor, an air quality sensor, a hydrogen sulfide sensor and/or a smoke sensor.
The display module in the device comprises a voltmeter and an input selection switch, and the measuring voltage input end of the voltmeter is electrically connected with the measuring signal output end of the gas sensor module through the input selection switch.
The power module in the device comprises a storage battery/dry battery pack, and specifically comprises the storage battery/dry battery pack, an anti-reverse connection circuit, a power switch, a voltage stabilizing integrated circuit and a charging socket.
The through hole on the air insulation switch cabinet body comprises a lock hole, an operation hole or a heat dissipation hole of the switch cabinet.
In fig. 2, the electrical circuit portion of the present apparatus is composed of a gas sampling module 3, a gas sensor module 4, a display module 5, and a power supply module 6 in this order.
The gas sampling module comprises a vacuum pump motor M and a control button switch SA3, and the power supply input end of the vacuum pump motor M is connected with the power supply output end of the power supply module after being connected with the button switch SA3 in series.
The gas sensor module comprises an ozone sensor detection circuit, a sulfur hexafluoride sensor detection circuit, an air quality sensor detection circuit, a hydrogen sulfide sensor detection circuit and a smoke sensor detection circuit; wherein:
the ozone sensor detection circuit comprises an ozone sensor CG1, a first resistor R1, a second constant current diode D2 and a seventh adjustable resistor R7; the sulfur hexafluoride sensor detection circuit comprises a sulfur hexafluoride sensor CG2, a second resistor R2, a third constant current diode D3 and an eighth adjustable resistor R8; the air quality sensor detection circuit comprises an air quality sensor CG3, a fifth resistor R5 and a tenth resistor R10; the hydrogen sulfide sensor detection circuit comprises a hydrogen sulfide sensor CG4, a third resistor R3, an eleventh resistor R11 and a fourth constant current diode D4; the smoke sensor detection circuit comprises a smoke sensor CG5, a fourth resistor R4, a sixth resistor R6 and a twelfth resistor R12.
Specifically, the output end of the ozone sensor CG1 is connected in series with the constant current diode D2 and the zero-setting potentiometer R7 at the output end of the ozone sensor and then connected in parallel with the power output end of the power circuit, and the auxiliary power supply end of the ozone sensor CG1 is connected in series with the auxiliary power supply resistor R1 and then connected in parallel with the power output end of the power circuit.
The output end of the sulfur hexafluoride sensor CG2 is connected in series with a constant current diode D3 and a zero-setting potentiometer R8 and then connected in parallel with the power output end of the power circuit, and the auxiliary power end of the sulfur hexafluoride sensor CG2 is connected in series with an auxiliary power resistor R2 and then connected in parallel with the power output end of the power circuit.
The output end of the air quality sensor CG3 is connected in series with the output end resistor R5 and then connected in parallel with the power output end of the power circuit, and the auxiliary power end of the air quality sensor CG3 is connected in parallel with the power output end of the power circuit.
The output ends of the hydrogen sulfide sensor CG4 and the smoke sensor CG5 are respectively connected with the constant current diode D4 and the output end resistor R6 in series and then connected in parallel at the power output end of the power circuit, and the auxiliary power supply ends of the hydrogen sulfide sensor CG4 and the smoke sensor CG5 are respectively connected with the resistor R3 and the resistor R4 in series and then connected in parallel at the power output end of the power circuit; the series connection points of the zero-setting potentiometers R7 and R8 and the constant current diodes D2 and D3 are respectively connected with the first selection point 1 and the second selection point 2 of the switch SA 2; the output ends of the air quality sensor, the hydrogen sulfide sensor and the smoke sensor are respectively connected with a voltage-sharing resistor R10, a voltage-sharing resistor R11 and a voltage-sharing resistor R12, and the other ends of the voltage-sharing resistor R10, the voltage-sharing resistor R11 and the voltage-sharing resistor R12 are connected with a third selection point 3 of a change-over switch SA2 and connected with the negative electrode of a power supply through a zero-setting potentiometer R9.
The hydrogen sulfide sensor, sulfur hexafluoride sensor and ozone sensor in the circuit are preferably solid electrolyte electrochemical gas-sensitive sensors.
The display module comprises an input selection switch SA2, a voltmeter V, a thirteenth resistor R13, a fourteenth resistor R14 and a ninth adjustable resistor R9, wherein the voltage dividing resistor R13 and the voltage dividing resistor R14 are connected in series and then connected in parallel at the power output end of the power circuit, the serial connection point of the voltage dividing resistor R13 and the voltage dividing resistor R14 is connected with the signal input end of the voltmeter V, the other signal input end of the voltmeter V is connected with the common point of the switch SA2, the working power input end of the voltmeter V is connected in parallel at the power output end of the power circuit, and the voltmeter V is selected from a digital display type voltmeter.
The power supply module comprises a battery pack B, an isolation diode D1, a charging socket K, a voltage-stabilizing integrated circuit IC, a power switch SA1 and a filter capacitor C1. The positive pole of charging socket K links to each other with battery B through isolation diode D1, and battery B's positive pole passes through switch SA1 and links to each other with voltage stabilizing integrated circuit IC's input, and it has filter capacitor C1 to connect in parallel between voltage stabilizing integrated circuit IC's the output and the regulation end, voltage stabilizing integrated circuit IC's regulation end is connected with battery B and charging socket K's negative pole. Among the above elements, the diode D1 is used for reversing the polarity of the charger when the battery in the machine is charged through the charging socket; the voltage stabilizing integrated circuit IC adopts a 7805 type and is used for stabilizing the voltage of a battery at 5V and supplying power to sensors at all levels; c1 is a filter capacitor for stabilizing the dc supply voltage.
A gas sensor is a sensor that detects a specific gas. The gas sensor mainly comprises a semiconductor gas sensor, a contact combustion type gas sensor, an electrochemical gas sensor and the like, wherein the most used gas sensors are semiconductor gas sensors. The application of the method mainly comprises the following steps: detection of carbon monoxide gas, detection of gas, detection of freon (R11, R12), detection of ethanol in breath, detection of oral malodor of the human body, and the like.
The gas type and the information related to the concentration of the gas are converted into electric signals, and the information related to the existence condition of the gas to be detected in the environment can be obtained according to the strength of the electric signals, so that the detection, the monitoring and the alarm can be carried out; and an automatic detection, control and alarm system can be formed by the interface circuit and the computer.
The gas sensor module in the circuit is used for converting various gas concentration signals into electric signals, and in the module circuit, resistors R1, R2, R3 and R4 are auxiliary power supply resistors of the sensor and are used for providing stable direct current for electrolyte or an auxiliary power supply inside the sensor; the diodes D2, D3 and D4 are constant current diodes at the output end of the sensor, and because the ozone, sulfur hexafluoride and hydrogen sulfide sensors in the circuit are output at constant current, the current at the output end of the sensor needs to be fixed by the constant current diodes, and meanwhile, convenience is provided for taking out signal voltage; the resistors R5 and R6 are load resistors at the output ends of the odor sensor and the smoke sensor respectively, so that convenience is provided for taking out signal voltage; the resistors R10, R11 and R12 are used for connecting the output ends of the smoke sensors for detecting the peculiar smell, the hydrogen sulfide and the smoke to simplify the circuit, because the output resistors of various gas sensors are in inverse proportion to the characteristic gas concentration, the resistors R10, R11 and R12 have the same resistance values which are far larger than the maximum output resistors of the three sensors, the potentials of the three points a, b and c in the graph can be displayed through one point (a third selection point 3 of a selection switch SA2 in the graph), the potential of the point 3 in the graph is approximately equal to the average value of the voltages of the point a, the point b and the point c, and the potential of the point 3 can be reduced as long as one point sensor senses the abnormity and the resistance value is reduced; the resistors R13 and R14, the diodes D2, D3 and D4, and the resistors R5 and R6 form a balanced bridge, so that the change of the output resistance of each sensor can be detected with high sensitivity; v is a digital voltmeter used for visually displaying the unbalanced voltage of the balanced bridge; the resistors R7, R8 and R9 are used for zero adjustment to obtain the reference gas concentration, so that the detection is convenient.
Because some characteristic gases such as particulate matters, hydrogen sulfide, ozone and the like also exist in the air, and are different from place to place, the outside air can be obtained through the gas sampling module before the detection equipment, the environment air is set as a reference value, the adjustable resistors (potentiometers) R7, R8 and R9 are respectively adjusted until the bridge where the resistors are located is balanced, the voltmeter V has no reading, and then the detection equipment can compare the difference between each characteristic gas in the air inside the equipment and the characteristic gas in the outside air, so that the equipment can be more conveniently detected.
The SA2 is a detection item selector switch for switching three detection items of "heat generation", "SF 6 leakage", and "discharge", wherein a first selection point 1 of the selector switch is for detecting "discharge" fault, a second selection point 2 is for detecting "SF 6 (sulfur hexafluoride) leakage" fault, and a third selection point 3 is for detecting "joint heat generation" fault.
The gas sampling device 2 in the device is connected with the gas sampling part of the gas sensor module 3 at the gas exhaust end. SA3 is a gas taking button switch, and the SA3 vacuum pump is pressed to operate, so that gas is sucked from the outside and blown into the gas sensor module from the exhaust end for judgment of the sensor.
When the device is actually used, a power switch SA1 is switched on, the device starts to work, about 1 minute is needed to wait at the moment, after all sensors are preheated and enter a stable state, the measurement can be started, the change of the output resistance of each sensor is reflected on a voltmeter through a balance bridge, in order to enable the measured data to be intuitive, the selective switch is switched to each position and is respectively zeroed, then an air intake of the detection device is aligned to a lock hole, an operation hole or a heat dissipation hole of a switch cabinet door, a vacuum pump is switched on to suck air by pressing SA3, the device can display the unbalanced voltage of the balance bridge corresponding to various characteristic gas concentrations, the unbalanced voltage of each item is compared with the values of ambient air and other switch cabinet positions, and the switch cabinet equipment positions with abnormal internal parts can be clearly displayed.
Because the utility model discloses a non-electric connection's gas analysis mode gathers the running state parameter of measurand, can detect three kinds of operation faults that switchgear is most common in the cabinet sensitively, need not stop the labour to the cubical switchboard in service when carrying out detection work, also need not change current cubical switchboard electric primary, secondary circuit equipment, do not influence the normal operating of current equipment, be favorable to the early discovery of trouble and handle in time, can avoid the expansion of problem and the spreading of trouble effectively, created the condition for the safe/steady operation of whole power transformation and distribution system; meanwhile, the device adopts a portable structural design, is convenient to use in a moving state, can obtain the operation conditions of the switch equipment in the cabinet of a plurality of air insulation switch cabinet bins or discover abnormal operation information thereof in a one-to-many manner in time at low cost in an electrified operation state of the closed combined switch cabinet, has low detection implementation cost and high detection accuracy, and solves the problems of technical improvement without power outage, perfection of device monitoring means and the like of the existing equipment.
The utility model discloses can extensively be used for the operation control field of various enclosed type combined electrical apparatus air insulated switchgear.
Claims (10)
1. The utility model provides a cubical switchboard internal fault detection device which characterized by:
providing a portable device housing having an air inlet and an air outlet;
a gas sampling module, a gas sensor module, a display module and a power supply module are arranged in the shell;
an air inlet of the device shell is connected with a through hole air passage on the cabinet body of the air insulation switch cabinet;
the air outlet of the device shell is communicated with the atmosphere;
the gas-sensitive sensor module is in gas circuit connection with the inner space of the air-insulated switch cabinet body through the gas sampling module, the air inlet of the device shell and the through hole on the air-insulated switch cabinet body;
the detection signal output end of the gas sensor module is electrically connected with the measurement signal input end of the display module;
and the power output end of the power supply module is electrically connected with the power input ends of the gas sampling module, the gas sensor module and the display module.
2. The switch cabinet internal fault detection device according to claim 1, wherein a sampling pipe is arranged between the device shell air inlet and the through hole on the air-insulated switch cabinet body, and the device shell air inlet is connected with the through hole air passage on the air-insulated switch cabinet body through the sampling pipe; one end of the sampling pipe, which is connected with the air path of the through hole in the air insulation switch cabinet body, is fixed on the through hole in the air insulation switch cabinet body through the flexible sucker.
3. The switch cabinet internal fault detection device according to claim 1, wherein the gas sampling module comprises a vacuum pump and a control button switch, a gas suction inlet of the vacuum pump is connected with a gas path of a sampling pipe through a gas inlet of the device shell, and a gas outlet of the vacuum pump is connected with a gas sampling part of the gas sensor module; the control button switch is connected in series between the power output end of the power supply module and the winding coil of the vacuum pump.
4. The switch cabinet internal failure detection device of claim 1, wherein the gas sensor module is a gas sensor.
5. The switch cabinet interior fault detection device of claim 4, wherein the gas sensor comprises an ozone sensor, a sulfur hexafluoride sensor, an air quality sensor, a hydrogen sulfide sensor and/or a smoke sensor.
6. The switch cabinet internal fault detection device of claim 1, wherein the display module comprises a voltmeter and an input selection switch, and a measurement voltage input end of the voltmeter is electrically connected with a measurement signal output end of the gas sensor module through the input selection switch.
7. The switch cabinet internal fault detection device of claim 1, wherein said power module comprises a battery/dry cell stack.
8. The switch cabinet internal fault detection device of claim 7, wherein said power module comprises a battery/dry cell stack, an anti-reverse connection circuit, a power switch, a voltage regulator integrated circuit and a charging jack.
9. The apparatus as claimed in claim 1, wherein the through hole of the air-insulated switchgear body comprises a lock hole, an operation hole or a heat dissipation hole of the switchgear.
10. An internal fault detection device for a switchgear cabinet according to claim 1, 3, 4, 6, 7 or 8, wherein said internal fault detection device is adapted to detect a fault in a switchgear cabinet
The gas sampling module comprises a vacuum pump motor and a control button switch; the control button switch is connected with a winding coil of a vacuum pump motor in series and then is correspondingly connected with the positive power supply output end and the negative power supply output end of the power supply module respectively;
the gas sensor module comprises an ozone sensor detection circuit, a sulfur hexafluoride sensor detection circuit, an air quality sensor detection circuit, a hydrogen sulfide sensor detection circuit and a smoke sensor detection circuit; wherein,
the ozone sensor detection circuit comprises an ozone sensor, a first resistor, a second constant current diode and a seventh adjustable resistor, wherein a1 st pin of the ozone sensor is connected with the anode of the power supply output end of the power supply module through the first resistor, a2 nd pin of the ozone sensor is connected with the anode of the power supply output end of the power supply module through the seventh adjustable resistor and the second constant current diode, a3 rd pin of the ozone sensor is connected with the cathode of the power supply output end of the power supply module, and the seventh adjustable resistor and the connecting end of the second constant current diode form a detection signal output end of the ozone sensor detection circuit;
the sulfur hexafluoride sensor detection circuit comprises a sulfur hexafluoride sensor, a second resistor, a third constant current diode and an eighth adjustable resistor, wherein a1 st pin of the sulfur hexafluoride sensor is connected with the anode of the power supply output end of the power supply module through the second resistor, a2 nd pin of the sulfur hexafluoride sensor is connected with the anode of the power supply output end of the power supply module through the eighth adjustable resistor and the third constant current diode, a3 rd pin of the sulfur hexafluoride sensor is connected with the cathode of the power supply output end of the power supply module, and the eighth adjustable resistor and the connecting end of the third constant current diode form a detection signal output end of the sulfur hexafluoride sensor detection circuit;
the air quality sensor detection circuit comprises an air quality sensor, a fifth resistor and a tenth resistor, wherein two heating end pins of the air quality sensor are correspondingly connected with the positive electrode and the negative electrode of the power supply output end of the power supply module respectively;
the detection circuit of the hydrogen sulfide sensor comprises a hydrogen sulfide sensor, a third resistor, an eleventh resistor and a fourth constant current diode, wherein a1 st pin of the hydrogen sulfide sensor is connected with the anode of the power supply output end of the power supply module through the third resistor, a2 nd pin of the hydrogen sulfide sensor is connected with the anode of the power supply output end of the power supply module through the fourth constant current diode, a3 rd pin of the hydrogen sulfide sensor is connected with the cathode of the power supply output end of the power supply module, and a3 rd pin of the hydrogen sulfide sensor is connected with the eleventh resistor in series to form a detection signal output end of the detection circuit of the hydrogen sulfide sensor;
the smoke sensor detection circuit comprises a smoke sensor, a fourth resistor, a sixth resistor and a twelfth resistor, wherein a1 st pin of the smoke sensor is connected with the anode of the power supply output end of the power supply module through the fourth resistor, a2 nd pin of the smoke sensor is connected with the anode of the power supply output end of the power supply module through the sixth resistor, a3 rd pin of the smoke sensor is connected with the cathode of the power supply output end of the power supply module, and the 2 nd pin of the smoke sensor is connected with the twelfth resistor in series to form a detection signal output end of the smoke sensor detection circuit;
the detection signal output end of the ozone sensor detection circuit is connected with the 1 st measurement signal input end of the input selection selector switch in the display module;
the detection signal output end of the sulfur hexafluoride sensor detection circuit is connected with the 2 nd measurement signal input end of the input selection selector switch in the display module;
the detection signal output ends of the air quality sensor detection circuit, the hydrogen sulfide sensor detection circuit and the smoke sensor detection circuit are connected in parallel and are connected with the No. 3 measurement signal input end of an input selection selector switch in the display module;
the display module comprises an input selection change-over switch, a voltmeter, a thirteenth resistor, a fourteenth resistor and a ninth adjustable resistor, wherein the 1 st measuring signal input end of the input selection change-over switch is connected with the detecting signal output end of the ozone sensor detecting circuit, the 2 nd measuring signal input end of the input selection change-over switch is connected with the detecting signal output end of the sulfur hexafluoride sensor detecting circuit, the 3 rd measuring signal input end of the input selection change-over switch is connected with the detecting signal output ends of the air quality sensor detecting circuit, the hydrogen sulfide sensor detecting circuit and the smoke sensor detecting circuit, and is connected with the negative pole of the power supply output end of the power supply module through the ninth adjustable resistor, the 2 working power supply input ends of the voltmeter are respectively correspondingly connected with the positive pole and the negative pole of the power supply output end of the power supply module, the first input signal end of the voltmeter is connected with the detecting signal output, a second input signal end of the voltmeter is connected with the positive electrode of the power supply output end of the power supply module through a thirteenth resistor, and the second input signal end of the voltmeter is also connected with the negative electrode of the power supply output end of the power supply module through a fourteenth resistor;
the power module include the group battery, keep apart the diode, charging socket, the steady voltage integrated circuit, switch and filter capacitor, charging socket concatenates behind the isolation diode and connects in the group battery just, between the negative pole end, the positive pole of group battery is connected through switch and steady voltage integrated circuit's power input end, steady voltage integrated circuit's power output end constitutes power module power output end's positive pole, steady voltage integrated circuit's earthing terminal is connected with the negative pole of group battery, constitute power module power output end's negative pole, filter capacitor connects in parallel between power module power output end just, between the negative pole end.
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| CN2010205020456U CN201803970U (en) | 2010-08-23 | 2010-08-23 | Internal fault detector for switch cabinet |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101968459A (en) * | 2010-08-23 | 2011-02-09 | 上海市电力公司超高压输变电公司 | Detection method and detection device of internal faults of switch cabinet |
| CN102288854A (en) * | 2011-05-10 | 2011-12-21 | 山东鲁亿通智能电气股份有限公司 | Switchgear fault current collection device |
| CN102364349A (en) * | 2011-10-10 | 2012-02-29 | 上海莫克电子技术有限公司 | Sensor for detecting faults of medium-voltage switch cabinet |
| CN103196589A (en) * | 2013-04-02 | 2013-07-10 | 国家电网公司 | Detection device for diagnosing heating temperature of switch cabinet |
| CN105372304A (en) * | 2015-12-10 | 2016-03-02 | 无锡拓能自动化科技有限公司 | Portable gas leakage detection device |
| CN105548837A (en) * | 2015-12-15 | 2016-05-04 | 国家电网公司 | Defect warning device of insulating member in switch cabinet |
| CN105572194A (en) * | 2015-12-10 | 2016-05-11 | 无锡拓能自动化科技有限公司 | Tying type gas leakage detection device |
| CN107078475A (en) * | 2014-10-17 | 2017-08-18 | Abb瑞士股份有限公司 | Air insulation Medium Voltage Switchgear and the probe system for air insulation Medium Voltage Switchgear |
| CN112345598A (en) * | 2020-10-23 | 2021-02-09 | 中国电力科学研究院有限公司 | Micro-nano sensing equipment for detecting fault gas of power transmission and transformation equipment |
| CN114166275A (en) * | 2021-11-30 | 2022-03-11 | 厦门加华电力科技有限公司 | Portable high tension switchgear SF6 comprehensive detector |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101968459A (en) * | 2010-08-23 | 2011-02-09 | 上海市电力公司超高压输变电公司 | Detection method and detection device of internal faults of switch cabinet |
| CN101968459B (en) * | 2010-08-23 | 2013-06-19 | 上海市电力公司 | Detection method of internal faults of switch cabinet |
| CN102288854A (en) * | 2011-05-10 | 2011-12-21 | 山东鲁亿通智能电气股份有限公司 | Switchgear fault current collection device |
| CN102288854B (en) * | 2011-05-10 | 2014-01-01 | 山东鲁亿通智能电气股份有限公司 | Switchgear fault current collection device |
| CN102364349A (en) * | 2011-10-10 | 2012-02-29 | 上海莫克电子技术有限公司 | Sensor for detecting faults of medium-voltage switch cabinet |
| CN103196589A (en) * | 2013-04-02 | 2013-07-10 | 国家电网公司 | Detection device for diagnosing heating temperature of switch cabinet |
| CN107078475A (en) * | 2014-10-17 | 2017-08-18 | Abb瑞士股份有限公司 | Air insulation Medium Voltage Switchgear and the probe system for air insulation Medium Voltage Switchgear |
| CN107078475B (en) * | 2014-10-17 | 2019-04-05 | Abb瑞士股份有限公司 | Air insulation Medium Voltage Switchgear and probe system for air insulation Medium Voltage Switchgear |
| CN105572194A (en) * | 2015-12-10 | 2016-05-11 | 无锡拓能自动化科技有限公司 | Tying type gas leakage detection device |
| CN105372304A (en) * | 2015-12-10 | 2016-03-02 | 无锡拓能自动化科技有限公司 | Portable gas leakage detection device |
| CN105548837A (en) * | 2015-12-15 | 2016-05-04 | 国家电网公司 | Defect warning device of insulating member in switch cabinet |
| CN105548837B (en) * | 2015-12-15 | 2017-08-29 | 国家电网公司 | A kind of switch cubicle interior insulation part defect prior-warning device |
| CN112345598A (en) * | 2020-10-23 | 2021-02-09 | 中国电力科学研究院有限公司 | Micro-nano sensing equipment for detecting fault gas of power transmission and transformation equipment |
| CN114166275A (en) * | 2021-11-30 | 2022-03-11 | 厦门加华电力科技有限公司 | Portable high tension switchgear SF6 comprehensive detector |
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