CN103198610B - The circuit of a kind of equipotential HV live displaying and live body proximity sensing and device thereof - Google Patents
The circuit of a kind of equipotential HV live displaying and live body proximity sensing and device thereof Download PDFInfo
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- CN103198610B CN103198610B CN201310069375.9A CN201310069375A CN103198610B CN 103198610 B CN103198610 B CN 103198610B CN 201310069375 A CN201310069375 A CN 201310069375A CN 103198610 B CN103198610 B CN 103198610B
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Abstract
The present invention relates to high-tension electricity field of engineering technology, be specifically related to circuit and the device thereof of a kind of equipotential HV live displaying and live body proximity sensing, comprise the induced voltage receiving circuit (3), rectification circuit (4), discharge and recharge oscillating circuit (5), illuminating circuit (6), sensor circuit (7), signal amplification circuit (8) and the sound warning circuit (9) that connect in turn.Effect of the present invention is: structure is simple, small and exquisite, can closely be directly installed on high pressure equipment for power transmission and distribution, and can realize the normal work of this device without the need to specializing in power supply; This device has equipotential HV live displaying function and live body proximity sensing function simultaneously, and the reliable in action realized; Significantly improve the safety coefficient of high-tension apparatus maintenance, reduce the potential safety hazard of maintainer.
Description
Technical field
The utility model relates to high-tension electricity field of engineering technology, is specifically related to circuit and the device thereof of a kind of equipotential HV live displaying and live body proximity sensing.
Background technology
In electric system, in high-tension switch cabinet, ring main unit, high-tension line, whether frequent use high voltage display device completes major loop with the instruction of high-tension electricity, the locking of relevant device, as the technological means ensuring safety, prevent maloperation, prevent mistakenly entering charged chamber in operation and maintenance, high voltage display device seems extremely important.At present, high voltage display device mainly contains contact high voltage display device and induction-type high-voltage charged display device.Although contact high voltage display device does not have the mutual interference between three-phase electric field, sensor is longer to the line of display unit, easily introduces extra interference.Induction-type high-voltage charged display device all employings inductosyn is all more responsive to the electric field change around installation site, can not be arranged on the place that the movable metal parts of distance is very near, metal that must be all can not block the sensor unit of induction-type high-voltage charged display device or shield.
Utility model content
The purpose of this utility model is the circuit and the device thereof that provide a kind of equipotential HV live displaying and live body proximity sensing, solve at present for detect high-tension switch cabinet, ring main unit, high-tension line etc. whether with the device of high-tension electricity easily because the line of device own comparatively grows existing extra interference and easily blocked by surrounding Confucian classics article or the problem of shield sensor unit.
For solving above-mentioned technical matters, the utility model by the following technical solutions:
A circuit for equipotential HV live displaying and live body proximity sensing, comprises the induced voltage receiving circuit, rectification circuit, discharge and recharge oscillating circuit, illuminating circuit, sensor circuit, signal amplification circuit and the sound warning circuit that connect in turn, wherein
Described induced voltage receiving circuit is mainly made up of induction electrode I, induction electrode II, stabilivolt DW1 and stabilivolt DW2,
Described rectification circuit is formed primarily of bridge rectifier, electric capacity C1, diode D1 and resistance R1,
Described discharge and recharge oscillating circuit is formed primarily of electric capacity C2 and Diac DB1,
Described illuminating circuit is formed primarily of LED and stabilivolt DW3,
Described sensor circuit is formed primarily of induced electricity pole piece A, junction field effect transistor VF, electric capacity C3, adjustable resistance R2, divider resistance R3 and adjustable resistance R4,
Described signal amplification circuit is formed primarily of time-base integrated circuit ICl, language integrated circuit (IC) 2 and electric capacity C4, resistance R5 and adjustable resistance R6,
Described audible alarm circuit is formed primarily of loudspeaker BL and NPN transistor V.
Further technical scheme is connected in parallel on two input ends of bridge rectifier after above-mentioned stabilivolt DW1 and stabilivolt DW2 differential concatenation, induction electrode I is connected between stabilivolt DW1 and an input end of bridge rectifier, one end of induction electrode II is connected between another input end of stabilivolt DW2 and bridge rectifier, an output terminal of described bridge rectifier is connected with one end of resistance R1, the other end of resistance R1 is connected with the positive pole of diode D1, electric capacity C1 is connected in parallel on two output terminals of bridge rectifier, one end of electric capacity C2 and the positive pole of Diac DB1 are connected on the negative pole of diode D1, the other end of electric capacity C2 is connected with another output terminal of bridge rectifier, the negative pole of described stabilivolt DW3 is connected with Diac DB1 negative pole, the positive pole of stabilivolt DW3 is connected with another output terminal of bridge rectifier, LED and stabilivolt DW3 are in parallel, described electric capacity C3, adjustable resistance R2, divider resistance R3, it is in parallel with stabilivolt DW3 after junction field effect transistor VF and adjustable resistance R4 connects successively, described induced electricity pole piece A is connected on the trigger end of junction field effect transistor VF, described time-base integrated circuit ICl has 8 pins, wherein 1 pin of time-base integrated circuit ICl is connected on another output terminal of bridge rectifier, also be connected with another output terminal of bridge rectifier after the 5 pin series capacitance C4 of time-base integrated circuit ICl, 2 pin of time-base integrated circuit ICl are connected between junction field effect transistor VF and adjustable resistance R4, 4 pin of time-base integrated circuit ICl and 8 pin are all connected between adjustable resistance R2 and divider resistance R3, described language integrated circuit (IC) 2 has 4 pins, wherein 1 pin of language integrated circuit (IC) 2 is connected with another output terminal of bridge rectifier, be connected with 3 pin of time-base integrated circuit ICl after 2 pin serial adjustable resistance R6 of language integrated circuit (IC) 2, be connected between adjustable resistance R2 and divider resistance R3 after 3 pin resistance in series R5 of language integrated circuit (IC) 2, 4 pin of language integrated circuit (IC) 2 are connected with the base stage of NPN transistor V, NPN transistor V collector series connection loudspeaker BL after be connected between adjustable resistance R2 and divider resistance R3, the emitter of NPN transistor V is connected on another output terminal of bridge rectifier.
A kind of equipotential HV live displaying and live body proximity sensing device, above-mentioned a kind of equipotential HV live displaying and the circuit of live body proximity sensing are installed in it, comprise columnar insulation box body and display panel, display panel is arranged in insulation box body, induced electricity pole piece A is arranged in display panel, loudspeaker BL is arranged on the middle part of induced electricity pole piece A, and the middle part of loudspeaker BL is provided with light emitting diode LED.
Further technical scheme is that above-mentioned insulation box body is fixed with connection bracket, connection bracket is connected with the retract bolt for being fixed on by whole device on high pressure equipment for power transmission and distribution.
Further technical scheme is that above-mentioned retract bolt is made up of support portion, inner bolt and outer bolt successively, and the external diameter of inner bolt is less than the external diameter of outer bolt and is enclosed within the screw of connection bracket.
Compared with prior art, the beneficial effects of the utility model are: structure is simple, small and exquisite, can closely be directly installed on high pressure equipment for power transmission and distribution, and can realize the normal work of this device without the need to specializing in power supply; This device has equipotential HV live displaying function and live body proximity sensing function simultaneously, and the reliable in action realized: when high pressure equipment for power transmission and distribution charging operation, this device can pass through lumination of light emitting diode, thus warning maintainer high pressure equipment for power transmission and distribution is charged, and when maintainer and live high voltage equipment exceed certain safe distance time, this device can send the voice signal of live body proximity sensing reliably, thus it is charged again to warn this high pressure primary equipment of maintainer; Significantly improve the safety coefficient of high-tension apparatus maintenance, reduce the potential safety hazard of maintainer.
Accompanying drawing explanation
Fig. 1 is the circuit structure diagram of a circuit embodiment of a kind of equipotential HV live displaying of the utility model and live body proximity sensing.
Fig. 2 is the partial circuit diagram realizing charged Presentation Function in Fig. 1.
Fig. 3 is the partial circuit diagram realizing live body proximity sensing function in Fig. 1.
Fig. 4 is the time-base integrated circuit ICl internal circuit diagram of NE555 type.
Fig. 5 is the time-base integrated circuit ICl pinouts of NE555 type.
Fig. 6 is the structural representation of a kind of equipotential HV live displaying of the utility model and a live body proximity sensing device embodiment.
The link structural drawing that Fig. 7 is a kind of equipotential HV live displaying of the utility model shown in Fig. 6 and a live body proximity sensing device embodiment.
Fig. 8 is the structure side view of retract bolt in Fig. 7.
Fig. 9 is the structure vertical view of retract bolt in Fig. 7.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
Fig. 1 shows an embodiment of the circuit of the utility model a kind of equipotential HV live displaying and live body proximity sensing: the circuit of a kind of equipotential HV live displaying and live body proximity sensing, comprise the induced voltage receiving circuit 3, rectification circuit 4, discharge and recharge oscillating circuit 5, illuminating circuit 6, sensor circuit 7, signal amplification circuit 8 and the sound warning circuit 9 that connect in turn, wherein
Described induced voltage receiving circuit 3 is mainly made up of induction electrode I, induction electrode II, stabilivolt DW1 and stabilivolt DW2,
Described rectification circuit 4 is formed primarily of bridge rectifier, electric capacity C1, diode D1 and resistance R1,
Described discharge and recharge oscillating circuit 5 is formed primarily of electric capacity C2 and Diac DB1,
Described illuminating circuit 6 is formed primarily of LED and stabilivolt DW3,
Described sensor circuit 7 is formed primarily of induced electricity pole piece A, junction field effect transistor VF, electric capacity C3, adjustable resistance R2, divider resistance R3 and adjustable resistance R4,
Described signal amplification circuit 8 is formed primarily of time-base integrated circuit ICl, language integrated circuit (IC) 2 and electric capacity C4, resistance R5 and adjustable resistance R6,
Described audible alarm circuit 9 is formed primarily of loudspeaker BL and NPN transistor V.
According to a preferred embodiment of the circuit of a kind of equipotential HV live displaying of the utility model and live body proximity sensing, further technical scheme is connected in parallel on two input ends of bridge rectifier after above-mentioned stabilivolt DW1 and stabilivolt DW2 differential concatenation, induction electrode I is connected between stabilivolt DW1 and an input end of bridge rectifier, one end of induction electrode II is connected between another input end of stabilivolt DW2 and bridge rectifier, an output terminal of described bridge rectifier is connected with one end of resistance R1, the other end of resistance R1 is connected with the positive pole of diode D1, electric capacity C1 is connected in parallel on two output terminals of bridge rectifier, one end of electric capacity C2 and the positive pole of Diac DB1 are connected on the negative pole of diode D1, the other end of electric capacity C2 is connected with another output terminal of bridge rectifier, the negative pole of described stabilivolt DW3 is connected with Diac DB1 negative pole, the positive pole of stabilivolt DW3 is connected with another output terminal of bridge rectifier, LED and stabilivolt DW3 are in parallel, described electric capacity C3, adjustable resistance R2, divider resistance R3, it is in parallel with stabilivolt DW3 after junction field effect transistor VF and adjustable resistance R4 connects successively, described induced electricity pole piece A is connected on the trigger end of junction field effect transistor VF, described time-base integrated circuit ICl has 8 pins, wherein 1 pin of time-base integrated circuit ICl is connected on another output terminal of bridge rectifier, also be connected with another output terminal of bridge rectifier after the 5 pin series capacitance C4 of time-base integrated circuit ICl, 2 pin of time-base integrated circuit ICl are connected between junction field effect transistor VF and adjustable resistance R4, 4 pin of time-base integrated circuit ICl and 8 pin are all connected between adjustable resistance R2 and divider resistance R3, described language integrated circuit (IC) 2 has 4 pins, wherein 1 pin of language integrated circuit (IC) 2 is connected with another output terminal of bridge rectifier, be connected with 3 pin of time-base integrated circuit ICl after 2 pin serial adjustable resistance R6 of language integrated circuit (IC) 2, be connected between adjustable resistance R2 and divider resistance R3 after 3 pin resistance in series R5 of language integrated circuit (IC) 2, 4 pin of language integrated circuit (IC) 2 are connected with the base stage of NPN transistor V, NPN transistor V collector series connection loudspeaker BL after be connected between adjustable resistance R2 and divider resistance R3, the emitter of NPN transistor V is connected on another output terminal of bridge rectifier.
Here it is worthy of note, the model of described time-base integrated circuit ICl is NE555, and the model of language integrated circuit (IC) 2 is NFC5212.
Presentation Function of the present utility model utilizes electrostatic induction principle, rely on the electric field around high pressure primary equipment, induced voltage receiving circuit is entered by induction electrode I and induction electrode II, by playing stabilivolt DW1 and the stabilivolt DW2 of high impedance attenuation, under the effect of bridge rectifier, alternating voltage is converted to DC voltage, voltage after rectification is charged to electric capacity C2 by discharge and recharge oscillating circuit, after being charged to certain voltage, reoffering and make power supply to LED, sensor circuit, signal amplification circuit and sound warning circuit.LED realizes charged display, its principle of work is the electroluminescent principle of PN junction: after diode electrode two ends add certain forward voltage, a large amount of electron injection will be had in diode, there is compound in the high-energy electron on PN junction conduction band and the hole in valence band, and unnecessary energy is emitted in the form of light, thus reach the object of light-emitting caution, this LED passes through the stabilivolt DW3 of a reverse protection in parallel in circuit, then noble potential is connected serially to Diac DB1, the N level of LED is connected with another output terminal (i.e. electronegative potential output terminal) of bridge rectifier, form displacement current loop, realize LED work.
As shown in Figure 3, sensor circuit 7 of the present utility model, signal amplification circuit 8 and sound warning circuit 9 are for realizing live body proximity sensing function of the present utility model.Wherein, sensor circuit 7 is made up of induced electricity pole piece A, junction field effect transistor VF, electric capacity C3, adjustable resistance R2, divider resistance R3 and adjustable resistance R4; Wherein, after electric capacity C3 and adjustable resistance R2 connects with resistance R3, junction field effect transistor VF and adjustable resistance R4 three after connecting again, parallel connection accesses major loop, and junction field effect transistor VF trigger end connects induced electricity pole piece A, one end is connected with resistance R3, the other end is connected with adjustable resistance R4.Signal amplification circuit 8 is made up of time-base integrated circuit ICl, language integrated circuit (IC) 2 and electric capacity C4, resistance R5 and adjustable resistance R6; Wherein, as shown in Figure 4 and Figure 5, time-base integrated circuit ICl adopts NE555 type time-base integrated circuit, and language integrated circuit (IC) 2 adopts NFC5212 type language integrated circuit.Audible alarm circuit 9 is made up of loudspeaker BL and transistor V.Live body proximity sensing principle of the present utility model: unmanned close to induced electricity pole piece A time, the resistance between the drain electrode of VF, source electrode is less, and electric current is comparatively large, and the 2 pin current potentials of ICl are higher than Vcc/3, and this alarm is failure to actuate; When there being people close to induced electricity pole piece A, the induced signal of human body can make the resistance value between the drain electrode of VF, source electrode increase, the 2 pin current potentials of IC1 are lower than Vcc/3, circuit upset in ICl, its 3 pin becomes high level from low level, make language integrated circuit be triggered and work, the speech signal of the 4 pin outputs of IC2, after V amplifies, sends language prompting sound by loudspeaker BL; Regulate the resistance of R4 and R6, the sensitivity of circuit can be changed, made people within induced electricity pole piece 0.5m, alarm equipment alarm.
Fig. 6 shows an embodiment of a kind of equipotential HV live displaying of the utility model and live body proximity sensing device, a kind of equipotential HV live displaying and live body proximity sensing device, above-mentioned a kind of equipotential HV live displaying and the circuit of live body proximity sensing are installed in it, comprise columnar insulation box body 1 and display panel 2, display panel 2 is arranged in insulation box body 1, induced electricity pole piece A12 is arranged in display panel 2, loudspeaker BL14 is arranged on the middle part of induced electricity pole piece A12, and the middle part of loudspeaker BL14 is provided with light emitting diode LED13.
Fig. 6 shows a preferred embodiment of a kind of equipotential HV live displaying of the utility model and live body proximity sensing device, insulation box body 1 being fixed with connection bracket 10, connection bracket 10 being connected with the retract bolt 11 for being fixed on by whole device on high pressure equipment for power transmission and distribution.
Fig. 7, Fig. 8 and Fig. 9 show another preferred embodiment of a kind of equipotential HV live displaying of the utility model and live body proximity sensing device, retract bolt 11 is made up of support portion 16, inner bolt 17 and outer bolt 18 successively, and the external diameter of inner bolt 17 is less than the external diameter of outer bolt 18 and is enclosed within the screw of connection bracket 10.When using this device, by retract bolt 11, this device is connected directly between on high pressure equipment for power transmission and distribution.When high pressure equipment for power transmission and distribution charging operation, this device can be luminous by LED, thus warning maintainer high pressure equipment for power transmission and distribution is charged; And when maintainer and live high voltage equipment exceed certain safe distance time, this device can send the voice signal of live body proximity sensing reliably, thus again warn this high pressure primary equipment charging operation of maintainer.In addition, the utility model adopts high voltage induction electric field to power, also can reliably working without the need to specializing in power supply; Further, the utility model is small and exquisite, compact conformation, is particularly suitable for the maintenance occasion of 35kV and following high-tension switch cabinet, switch yard primary equipment etc.
Claims (4)
1. the circuit of an equipotential HV live displaying and live body proximity sensing, it is characterized in that: comprise the induced voltage receiving circuit (3), rectification circuit (4), discharge and recharge oscillating circuit (5), illuminating circuit (6), sensor circuit (7), signal amplification circuit (8) and the sound warning circuit (9) that connect in turn, wherein
Described induced voltage receiving circuit (3) is mainly made up of induction electrode I, induction electrode II, stabilivolt DW1 and stabilivolt DW2,
Described rectification circuit (4) is formed primarily of bridge rectifier, electric capacity C1, diode D1 and resistance R1,
Described discharge and recharge oscillating circuit (5) is formed primarily of electric capacity C2 and Diac DB1,
Described illuminating circuit (6) is formed primarily of LED and stabilivolt DW3,
Described sensor circuit (7) is formed primarily of induced electricity pole piece A, junction field effect transistor VF, electric capacity C3, adjustable resistance R2, divider resistance R3 and adjustable resistance R4,
Described signal amplification circuit (8) is formed primarily of time-base integrated circuit ICl, language integrated circuit (IC) 2 and electric capacity C4, resistance R5 and adjustable resistance R6,
Described audible alarm circuit (9) is formed primarily of loudspeaker BL and NPN transistor V;
Be connected in parallel on two input ends of bridge rectifier after described stabilivolt DW1 and stabilivolt DW2 differential concatenation, induction electrode I is connected between stabilivolt DW1 and an input end of bridge rectifier, one end of induction electrode II is connected between another input end of stabilivolt DW2 and bridge rectifier, an output terminal of described bridge rectifier is connected with one end of resistance R1, the other end of resistance R1 is connected with the positive pole of diode D1, electric capacity C1 is connected in parallel on two output terminals of bridge rectifier, one end of electric capacity C2 and the positive pole of Diac DB1 are connected on the negative pole of diode D1, the other end of electric capacity C2 is connected with another output terminal of bridge rectifier, the negative pole of described stabilivolt DW3 is connected with Diac DB1 negative pole, the positive pole of stabilivolt DW3 is connected with another output terminal of bridge rectifier, LED and stabilivolt DW3 are in parallel, described electric capacity C3, adjustable resistance R2, divider resistance R3, it is in parallel with stabilivolt DW3 after junction field effect transistor VF and adjustable resistance R4 connects successively, described induced electricity pole piece A is connected on the trigger end of junction field effect transistor VF, described time-base integrated circuit ICl model is NE555, there are 8 pins, wherein 1 pin of time-base integrated circuit ICl is connected on another output terminal of bridge rectifier, also be connected with another output terminal of bridge rectifier after the 5 pin series capacitance C4 of time-base integrated circuit ICl, 2 pin of time-base integrated circuit ICl are connected between junction field effect transistor VF and adjustable resistance R4, 4 pin of time-base integrated circuit ICl and 8 pin are all connected between adjustable resistance R2 and divider resistance R3, described language integrated circuit (IC) 2 model is NFC5212, there are 4 pins, wherein 1 pin of language integrated circuit (IC) 2 is connected with another output terminal of bridge rectifier, be connected with 3 pin of time-base integrated circuit ICl after 2 pin serial adjustable resistance R6 of language integrated circuit (IC) 2, be connected between adjustable resistance R2 and divider resistance R3 after 3 pin resistance in series R5 of language integrated circuit (IC) 2, 4 pin of language integrated circuit (IC) 2 are connected with the base stage of NPN transistor V, be connected between adjustable resistance R2 and divider resistance R3 after the collector series connection loudspeaker BL of NPN transistor V, the emitter of NPN transistor V is connected on another output terminal of bridge rectifier.
2. an equipotential HV live displaying and live body proximity sensing device, the circuit of a kind of equipotential HV live displaying as claimed in claim 1 and live body proximity sensing is installed in it, it is characterized in that: comprise columnar insulation box body (1) and display panel (2), display panel (2) is arranged in insulation box body (1), induced electricity pole piece A(12) be arranged in display panel (2), loudspeaker BL(14) be arranged on induced electricity pole piece A(12) middle part, and loudspeaker BL(14) middle part LED (13) is installed.
3. a kind of equipotential HV live displaying according to claim 2 and live body proximity sensing device, it is characterized in that: described insulation box body (1) is fixed with connection bracket (10), connection bracket (10) being connected with the retract bolt (11) for being fixed on by whole device on high pressure equipment for power transmission and distribution.
4. a kind of equipotential HV live displaying according to claim 3 and live body proximity sensing device, it is characterized in that: described retract bolt (11) is made up of support portion (16), inner bolt (17) and outer bolt (18) successively, the external diameter of inner bolt (17) is less than the external diameter of outer bolt (18) and is enclosed within the screw of connection bracket (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310069375.9A CN103198610B (en) | 2013-03-05 | 2013-03-05 | The circuit of a kind of equipotential HV live displaying and live body proximity sensing and device thereof |
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| CN201310069375.9A CN103198610B (en) | 2013-03-05 | 2013-03-05 | The circuit of a kind of equipotential HV live displaying and live body proximity sensing and device thereof |
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| CN103198610A CN103198610A (en) | 2013-07-10 |
| CN103198610B true CN103198610B (en) | 2015-12-09 |
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| CN103792417B (en) * | 2014-02-28 | 2017-01-11 | 国家电网公司 | Active and passive dual-mode sensing high-voltage presence indication device |
| CN104635023A (en) * | 2015-02-06 | 2015-05-20 | 四川蓝讯宝迩电子科技有限公司 | High-voltage electrification acousto-optic indicating device |
| CN104749418A (en) * | 2015-04-03 | 2015-07-01 | 四川蓝讯宝迩电子科技有限公司 | Indoor high voltage electrified display device |
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| CN104749417A (en) * | 2015-04-03 | 2015-07-01 | 四川蓝讯宝迩电子科技有限公司 | High-voltage live display system for enhancing prompting effect |
| CN104749420A (en) * | 2015-04-03 | 2015-07-01 | 四川蓝讯宝迩电子科技有限公司 | Sensing type high-voltage presence indication device |
| CN105158548A (en) * | 2015-08-24 | 2015-12-16 | 国家电网公司 | Novel high-voltage electroscope |
| EP3546969A1 (en) * | 2018-03-29 | 2019-10-02 | Koninklijke Philips N.V. | Radio frequency (rf) antenna element with a detuning system |
| CN111337734A (en) * | 2020-03-23 | 2020-06-26 | 朔黄铁路发展有限责任公司 | Near-electricity protection circuit and near-electricity protection equipment |
| CN111257602B (en) * | 2020-03-23 | 2022-11-25 | 朔黄铁路发展有限责任公司 | Arrester testing device and arrester testing system |
| CN113291350B (en) * | 2021-04-12 | 2022-10-14 | 中车唐山机车车辆有限公司 | EMUs high-pressure tank early warning device and EMUs that discharges |
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| CN203217713U (en) * | 2013-03-05 | 2013-09-25 | 四川省电力公司达州电业局 | Equipotential high voltage electrification display and living body approach alarm circuit and device thereof |
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| US4788529A (en) * | 1987-04-28 | 1988-11-29 | Pao Yin Co., Ltd. | Multifunctional safety gas flow regulator's controller |
| CN2300146Y (en) * | 1997-06-11 | 1998-12-09 | 符向桃 | Multi-functional warning device |
| CN201820328U (en) * | 2010-08-26 | 2011-05-04 | 刘家发 | Capacitor induction type approach control device |
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| CN103198610A (en) | 2013-07-10 |
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