CN104574810A - Infrared safety monitoring device and device for safety protection during high-voltage test - Google Patents
Infrared safety monitoring device and device for safety protection during high-voltage test Download PDFInfo
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- CN104574810A CN104574810A CN201510018791.5A CN201510018791A CN104574810A CN 104574810 A CN104574810 A CN 104574810A CN 201510018791 A CN201510018791 A CN 201510018791A CN 104574810 A CN104574810 A CN 104574810A
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/02—Alarms for ensuring the safety of persons
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/12—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to undesired approach to, or touching of, live parts by living beings
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Abstract
The invention provides an infrared safety monitoring device and a device provided with the infrared safety monitoring device and used for safety protection during a high-voltage test. The device used for safety protection during the high-voltage test comprises an auxiliary power circuit. The auxiliary power circuit is used for converting electric power coming from a power grid into a constant-voltage low-voltage direct current and supplying the constant-voltage low-voltage direct current to the infrared safety monitoring device. The infrared safety monitoring device comprises an infrared signal generation unit, a signal monitoring unit, a detection signal processing unit, a logical control unit and a trip warning unit.
Description
Technical field
For the device of security protection when the present invention relates to a kind of infrared ray safety monitoring device and there is the high voltage test of this infrared ray safety monitoring device.
Background technology
In electric power system, high voltage test is an important step in the work of power equipment operation and maintenance, and it serves very important effect to the safe operation of guarantee electric power system primary equipment.In high voltage test process, there is following problem: in the working site of high voltage test, thousands of volt can be produced in testing process, even higher high pressure, and, when the power transformer, GIS device, bus etc. large-scale to scene carry out high voltage test, because pressurised zone is very large, although therefore have provisional protection to enclose in pressurised zone block and have testing crew to guard, in the position, dead angle that testing crew cannot be guarded, non-high pressure testing crew still may be strayed into pressurised zone.In addition, if testing crew awareness of safety thin, operate against regulations or guard not in place, also may have people and cross over and enclose the situation of blocking, thus may to constitute a serious threat to personal life security.Especially, when a large amount of casual labour participates in large on-the-spot high voltage test, the possibility that this situation occurs can strengthen.
In current high-voltage test on-site both domestic and external, the situation of many teams and groups testing crew cross-operation is more and more general, therefore causes the complicated of the testing crew of working site and equipment situation.And in current high voltage test process, still adopt general safe fence and rope as safety prevention measure.And existing safe fence and rope only can play warning function when high voltage test, being strayed into and touching by mistake of personnel cannot be prevented, thus effectively cannot protect the safety of personnel and equipment.
At the operation field of high voltage test, the working range of testing crew is mainly divided into Energy control district, pressurized operation district two parts, these regions must meet safety requirements, and the testing crew distance tested device in pressurized operation district and the safe distance of booster apparatus will meet relevant regulations.Can refer to DL56-1995 electrical safe working order (high-tension laboratory part), the regulation as shown in table 1,2 carries out testing inspection:
Table 1: AC and DC experimental safe distance
| Test voltage (kV) | 50 | 100 | 200 | 500 | 750 | 1000 |
| Safe distance (m) | 1.2 | 1.5 | 3 | 5 | 7 | 10 |
Table 2: shock test (peak value) safe distance
Therefore, develop and a set ofly thoroughly can just seem very urgent to the system that testing crew and the personal safety that is strayed into personnel play protective action, and have important practical significance.
Summary of the invention
In view of this; for the device of security protection when main purpose of the present invention is the high voltage test providing a kind of infrared ray safety monitoring device and have this infrared ray safety monitoring device, thus when high voltage test effectively protection test personnel, be strayed into the safety of personnel and high-tension apparatus.Design of the present invention is based on Analog Electronics Technique, Digital Electronic Technique, designs by considering to comprise multiple functions such as infrared acquisition, signal transacting, Logic judgment, output control, trigger alarm, auto-breaking.
For achieving the above object, the invention provides a kind of outside line safety monitoring device, it is characterized in that, comprise infrared signal generation unit, signal monitoring unit, detection signal processing unit, logic control element and tripping alarm unit,
Described infrared signal generation unit is configured to produce the infrared ray fence arranged around high-tension apparatus;
Described signal monitoring unit comprises: at least one infrared monitor control circuit, and it is configured to generate detection signal when described infrared ray fence is blocked because foreign object passes through, and described detection signal is transferred to described detection signal processing unit; And high voltage source signal extracting circuit, it is configured to the power supply electrifying signal electric power signal from electrical network being exported after step-down transformer step-down, rectification and filtering low-voltage direct;
Described detection signal processing unit is connected with described signal monitoring unit, and it is configured to described detection signal to be converted to fixed level signal by pulse signal;
Described logic control element is configured to when receiving described fixed level signal and described power supply electrifying signal, output logic control signal after logical operation;
Described tripping alarm cell location is the logic control signal that described logic control element exports is transferred to power-down circuit and/or warning circuit to disconnect described high-tension apparatus and/or to give the alarm.
Preferably, described infrared signal generation unit is configured to produce the internal layer infrared ray fence and outer infrared ray fence arranged around high-tension apparatus respectively;
Described detection signal can comprise outer detection signal and internal layer detection signal, and when outer infrared ray fence is blocked, described outer detection signal is low level, and when outer infrared ray fence is not blocked, described outer detection signal is high level; When internal layer infrared ray fence is blocked, described internal layer detection signal is low level, and when internal layer infrared ray fence is not blocked, described internal layer detection signal is high level.
Preferably, described detection signal processing unit comprises:
Latch chip, its first input end receives described outer detection signal, and its second input receives described internal layer detection signal, and its first output exports the outer fixed level signal corresponding to described outer detection signal, its second output exports the internal layer fixed level signal corresponding to described internal layer detection signal, further, the output enable signal end of latch chip is placed in low level;
Not gate, its input receives described outer fixed level signal, and its output is connected to the latch enable signal end of described latch chip;
Manual reset switch, one end ground connection, between the described outer output that its other end is connected to described latch chip and described not gate.
Preferably, described logic control element comprise first with door and second and door, described first receives described outer fixed level signal and described power supply electrifying signal with door and exports outer logic control signal; Described second receives described outer logic control signal and described internal layer fixed level signal with door, and exports internal layer logic control signal.
Preferably, described first is connected to warning circuit with the output of door, and described second is connected to power-down circuit with the output of door or is connected to described warning circuit and power-down circuit simultaneously.
Preferably, described warning circuit comprises the contact of interconnective audible-visual annunciator and the first relay, described power-down circuit comprises the contact of the second relay making described high-tension apparatus power-off, wherein, the coil of described first relay can respond to the output signal of described first and door, and the coil of described second relay can respond to the output signal of described second and door.
Preferably, described warning circuit also comprises outer indicator light and internal layer indicator light, and when described first relay is connected, described outer indicator light is lighted, and when described second relay is connected, described internal layer indicator light is lighted.
Preferably, described outer detection signal and described internal layer detection signal are 0 to 0.5V when low level, and described outer detection signal and described internal layer detection signal are 0.5V to 2.5V when high level.
For the device of security protection when the present invention also provides a kind of high voltage test, it comprises:
This infrared ray safety monitoring device mentioned above;
Auxiliary power circuit, it is configured to the electric power from electrical network to be converted to constant voltage low-voltage DC, and this constant voltage low-voltage DC is supplied to described infrared ray safety monitoring device.
Preferably, the device being used for security protection during described high voltage test has 380V and 220V power input and 380V and 220V power output end.
The device being used for security protection when infrared ray safety monitoring device of the present invention and high voltage test is compared to the beneficial effect of prior art:
1, when high voltage test, even if personnel are strayed into pilot region, also can not get an electric shock, thus effectively protection test personnel, be strayed into the safety of personnel and high-tension apparatus;
2, by warning circuit reasonable in design and power-down circuit, thus effectively safety custody is carried out to working site, improve the safe degree of controllability of working site further.
3, the device being used for security protection during high voltage test has 380V and 220V power input and 380V and 220V power output end, facilitates the demand of the different electric pressure in testing ground.
Accompanying drawing explanation
For the design drawing of the control panel of the device of security protection when Fig. 1 shows high voltage test according to an embodiment of the invention.
For the circuit diagram of the auxiliary power circuit of the device of security protection when Fig. 2 shows high voltage test according to an embodiment of the invention.
Fig. 3 shows the block diagram of each module of infrared ray safety monitoring device according to an embodiment of the invention.
For the workflow diagram of the device of security protection when Fig. 4 shows high voltage test according to an embodiment of the invention.
Fig. 5 shows the circuit diagram of the infrared monitor control circuit of the signal monitoring unit of infrared ray safety monitoring device according to an embodiment of the invention.
Fig. 6 shows the circuit diagram of the detection signal processing unit of infrared ray safety monitoring device according to an embodiment of the invention.
Fig. 7 shows the circuit diagram of the logic control element of infrared ray safety monitoring device according to an embodiment of the invention.
Fig. 8 shows the circuit diagram of the tripping alarm unit of infrared ray safety monitoring device according to an embodiment of the invention.
Embodiment
For making object of the present invention, technical scheme and beneficial effect definitely, hereafter will describe the present invention in detail by reference to the accompanying drawings.
Be used for the device of security protection in use during high voltage test of the present invention, be electrically connected to this high-tension apparatus through the testing equipment for testing high-tension apparatus, and the infrared ray fence around this high-tension apparatus can be produced.Determine whether report to the police and whether disconnect high-tension apparatus by the detection state of high-tension apparatus and the state of infrared ray fence.
For the design drawing of the control panel of the device of security protection when Fig. 1 shows high voltage test according to an embodiment of the invention.For the circuit diagram of the auxiliary power circuit of the device of security protection when Fig. 2 shows high voltage test according to an embodiment of the invention.Fig. 3 shows the block diagram of each module of infrared ray safety monitoring device according to an embodiment of the invention.
As shown in Figure 1, be used for the control panel of the device 100 of security protection during the high voltage test of the present embodiment, it comprises the master switch 110 for the opening and closing of the device 100 of security protection when controlling high voltage test; 220V power input 121 and 380V power input 122; 220V power output end 131 and 380V power output end 132; Instruction have foreign object have passed through outer infrared ray fence outer indicator light 171 and instruction have personnel to have passed through the internal layer indicator light 172 of internal layer infrared ray fence; The reset button 160 of the reset switch in the detection signal processing unit 230 in the infrared ray safety monitoring device 200 shown in control chart 3; Ground protection end 180; Automatically the self-test switch 150 that whether infrared ray is blocked and whether power supply is connected is detected before high voltage test starts; And multiple fuse 140.Wherein, master switch 110,220V power input 121 and 380V power input 122,220V power output end 131 and 380V power output end 132 all have the indicator light of indicating operating status, and 220V power output end 131 and 380V power output end 132 also comprise the switch that control voltage exports unlatching or closes.
As shown in Figure 2, auxiliary power circuit by the electric power from electrical network (namely, the electric power that 220V power input 121 and 380V power input 122 receive) be converted to constant voltage low-voltage DC, and this constant voltage low-voltage DC is supplied to the infrared ray safety monitoring device 200 shown in Fig. 3, thus power for the modules in infrared ray safety monitoring device 200.
As shown in Figure 3, infrared ray safety monitoring device according to the present invention comprises infrared signal generation unit 210, signal monitoring unit 220, detection signal processing unit 230, logic control element 240 and tripping alarm unit 250.
Infrared signal generation unit 210 produces the internal layer infrared ray fence and outer infrared ray fence arranged around high-tension apparatus respectively.
Signal monitoring unit 220 comprises two infrared monitor control circuit, and when outer infrared ray fence and internal layer infrared ray fence are blocked, two infrared monitor control circuit can generate the outer detection signal of high level respectively
with the internal layer detection signal of high level
and by outer detection signal
with internal layer detection signal
transfer to detection signal processing unit 230, when infrared ray fence is not blocked, then generates low level outer detection signal B and low level internal layer detection signal C and they are transferred to detection signal processing unit 230; And high voltage source signal extracting circuit, the electric power signal from electrical network is exported the power supply electrifying signal A of low-voltage direct by it after step-down transformer step-down, integration and filtering, and power supply electrifying signal A is transferred to logic control element 240.
Detection signal processing unit 230 is connected with signal monitoring unit 220, and it is by outer detection signal
with internal layer detection signal
the outer fixed level signal of high level is converted to by pulse signal
with the internal layer fixed level signal of high level
if infrared ray fence is not blocked, then the output of detection signal processing unit 230 exports respectively and has low level outer fixed level signal B ' and low level internal layer fixed level signal C '.
Logic control element 240 receive outer fixed level signal B ' or
with internal layer fixed level signal C ' or
and power supply electrifying signal A, and by outer fixed level signal B ' or
with internal layer fixed level signal C ' or
and power supply electrifying signal A carries out logical operation by logical circuit;
The logic signal transmission that logic control element 240 exports by tripping alarm unit 250 to power-down circuit and/or warning circuit to disconnect high voltage source and/or to give the alarm.
For the workflow diagram of the device of security protection when Fig. 4 shows high voltage test according to an embodiment of the invention.
As shown in Figure 4, the device 100 of security protection is used for during high voltage test according to following step work:
S101: the power supply being used for the device 100 of security protection when connecting high voltage test.
S102: before high voltage test starts, first opens self-test switch 150 automatically to detect infrared ray and whether be blocked and whether power supply is connected.
As exception detected, then perform S103: do not carry out high voltage test and checkout gear abnormal cause.
As without exception in detected, then close automatic sense switch 150, and perform S104: start to carry out high voltage test.
S105: judged whether that non-test personnel pass through outer fence
As judged have non-test personnel to pass through outer fence, then perform S106 further: tripping alarm unit 250 sends audible and visible alarm.
S107: determine whether to continue to maintain to report to the police.
As testing crew judges to eliminate danger in pilot region, then perform S108: temporary close reset switch is to remove audible and visible alarm and the device 100 being used for security protection during high voltage test is reset to normal operating conditions.
As testing crew judges that in pilot region, danger is not excluded, then perform S109: maintain sound and light alarm.
Further execution S110: judged whether that non-test personnel pass through internal layer fence.
As judged have non-test personnel to pass through outer fence, then perform S111 further: the connection between tripping alarm unit 250 cutoff high equipment and high voltage source, occurs with Accident prevention.
Finally, S112 is performed: judge whether danger still exists.
As testing crew judges that in pilot region, danger is not excluded, then perform S113: wait for the further inspection to pilot region.
As testing crew judges that in pilot region, danger is excluded, then return and perform S101.
Fig. 5 shows the circuit diagram of the infrared monitor control circuit of the signal monitoring unit of infrared ray safety monitoring device according to an embodiment of the invention.
As shown in Figure 5, infrared monitor control circuit comprises infrared sensor and signal processing circuit.When the infrared ray fence that infrared signal generation unit 210 produces is blocked, infrared sensors is less than the infrared signal from infrared signal generation unit 210, then infrared sensor sends low level signal to signal processing circuit.Further, when the infrared ray fence that infrared signal generation unit 210 produces is not blocked, infrared sensors is to the infrared signal from infrared signal generation unit 210, then infrared sensor sends high level signal to signal processing circuit.Signal processing circuit comprises the comparator be connected with infrared sensor, and its negative input end is connected between two resistance R1 and R2, R1 and R2 is connected in series between the output of auxiliary power circuit and ground.Infrared monitor control circuit generates detection signal according to the blocking state of infrared ray fence, this detection signal has following characteristics: detection signal when low level (, when infrared ray fence is not blocked) be 0 to 0.5V, and detection signal (that is, when infrared ray fence is blocked) when high level is 0.5V to 2.5V.
Fig. 6 shows the circuit diagram of the detection signal processing unit of infrared ray safety monitoring device according to an embodiment of the invention.
As described above, in the process of carrying out high voltage test, infrared monitor control circuit only exports high level pulse signal when infrared ray is blocked, but, because this pulse signal duration is short, make when having non-test personnel through when continuing across internal layer fence after outer fence, logic control element 240 can only record non-test personnel pass internal layer fence situation through outer fence and non-test personnel respectively, and is difficult to record the situation that non-test personnel have passed through two fences.Further, the warning circuit in the pulse signal driving tripping alarm unit 250 that can not continue and power-down circuit.
And detection signal can be converted to fixed level signal by pulse signal by detection signal processing unit 230, thus overcome the problems referred to above.
As shown in Figure 6, detection signal processing unit 230 comprises 74HC373 type latch chip, its pulse signal is carried out latch process, input 1D and 2D receive respectively outer detection signal B or
with internal layer detection signal C or
oC end is for controlling output signal end, and when OC end is placed in low level (such as, ground connection), output 1Q and 2Q can output signal; ENG end is for controlling latch signal end, and output 1Q is connected to ENG end through not gate.Therefore, the signal deciding mode of operation of latch of output 1Q.Following three kinds of output modes are had during high voltage test:
(1) personnel are not had to pass fence.Now (namely input 1D and 2D be low level, outer detection signal B and internal layer detection signal C is the low level of 0 ~ 0.5V), output 1Q and 2Q is low level, and ENG end is high level, latch is in data-transmission mode, is normal mode of operation.
(2) there are personnel to cross outer fence, but do not cross internal layer fence.Now input 1D is high level, and output 1Q is high level, and input 2D is low level, and output 2Q is low level.ENG is low level, thus latch is in forbid latch and read latch mode, and output 1Q will continue output high level and by this Signal transmissions to logic control element 240 and tripping alarm unit 250.
After eliminating relative alarm reason, manually reset switch (normal open switch) temporarily can be closed, thus make output 1Q ground connection.Therefore, ENG end will be placed in high level, and latch is in data-transmission mode, and now high level pulse terminates, and input 1D is low level and output 1Q is low level, disconnect reset switch, thus return to normal condition.
(3) personnel are had to pass outer fence, and subsequently through internal layer fence.Although now input 1D is low level, due to the Puled input of outer detection signal before, make output 1Q continue to export high level, and input 2D is high level, output 2Q is high level.ENG is low level, and latch is in be forbidden latching and reading latch mode, exports 1Q and 2Q and will continue output high level by this Signal transmissions to logic control element 240 and tripping alarm unit 250.
After eliminating relative alarm reason, manually reset switch (normal open switch) temporarily can be closed, thus make output 1Q ground connection.Therefore, ENG end will be placed in high level, and latch is in data-transmission mode, and now high level pulse terminates, and input 1D and 2D is low level and output 1Q and 2Q is low level, disconnect reset switch, thus return to normal condition.
Fig. 7 shows the circuit diagram of the logic control element of infrared ray safety monitoring device according to an embodiment of the invention.
As shown in Figure 7, logic control element 240 is comprised two and door, be connected with the output of high voltage source signal extracting circuit and the output 1Q of detection signal processing unit 230 respectively with two inputs of door 241 (that is, by power supply electrifying signal A and outer fixed level signal B ' or
input to the input with door 241), with two inputs of door 242 respectively at being connected with the output of door 241 and the output 2Q of detection signal processing unit 230 (that is, by power supply electrifying signal A and outer fixed level signal B ' or
logical signal after combination and internal layer fixed level signal C ' or
input to the input with door 242).With the output of door 241 also by Signal transmissions to the warning circuit in tripping alarm unit 250, with the output of door 242 by Signal transmissions to the power-down circuit in tripping alarm unit 250.
In addition, also can be connected to warning circuit and power-down circuit with the output of door 242 simultaneously.
Carry out in the process of high voltage test, the signal of input logic control unit 240 represents by following form:
Power supply electrifying signal A: open for the device of security protection during high voltage test;
Power supply electrifying signal
the device being used for security protection during high voltage test is not opened;
The infrared signal B ' of outer fence: outer infrared ray fence is not blocked;
The infrared signal of outer fence
the infrared ray of outer fence is blocked;
The infrared signal C ' of internal layer fence: the infrared ray of internal layer fence is not blocked;
The infrared signal of internal layer fence
the infrared ray of internal layer fence is blocked.
Logic control element 240 can realize following logical combination:
(1) AB ': the device being used for security protection during high voltage test opens and outer infrared ray fence is not blocked, and in the case, is used for the device of security protection and normally runs during high voltage test.Being 0 with door 241 output logic signal, is 0 with door 242 output logic signal.
(2) A
c ': the device being used for security protection during high voltage test opens and the infrared ray of outer fence is blocked, but the infrared ray of internal layer fence is not blocked.Being 1 with door 241 output logic signal, is 0 with door 242 output logic signal.That is, under this state, non-test personnel's distance internal layer fence and tested equipment still have certain safe distance, the dangerous situation of electric shock or electric discharge etc. can not be there is, therefore (namely the power-down circuit in tripping alarm unit 250 does not make high-tension apparatus power-off, be 0 with door 242 output logic signal), high voltage test is not interrupted.But in this condition, the warning circuit in tripping alarm unit 250 receives the high level logic signal 1 exported with door 241, and by sound and/or luminescence is reported to the police, be withdrawn into region outside outer fence to point out unrelated person.
(3) A
open for the device of security protection during high voltage test, the infrared ray of outer fence is blocked and the infrared ray of internal layer fence is blocked.Being 1 with door 241 output logic signal, is 1 with door 242 output logic signal.That is, under this state, non-test personnel are through after outer fence, the warning of not accepting warning and/or testing crew is withdrawn into beyond outer fence area, and continue to have passed through internal layer fence, now, non-test personnel's distance high-voltage power supply and testing equipment are comparatively near, and the dangerous situation of electric shock or electric discharge etc. may occur.Therefore, the power-down circuit in tripping alarm unit 250 disconnects the connection between high-tension apparatus and high voltage source, thus stops high voltage test to avoid dangerous generation.
Fig. 8 shows the circuit diagram of the tripping alarm unit of infrared ray safety monitoring device according to an embodiment of the invention.
As shown in Figure 8, this tripping alarm unit uses independently control power supply to power separately.Switch S 1 can open or close the first relay, when switch S 1 closes, first relay is started working, that make the first coil of the first relay can respond to logic control element 240 with output signal that is door 241, when being 1 with door 241 output logic signal (, when non-test personnel have passed through outer fence), the first contact KM1 of the first relay closes.Therefore, warning circuit is switched on, and alarm can send alarm signal with the form of sound and/or light.Meanwhile, for the outer region alarm lamp 171 of the device of security protection when being also used to refer to high voltage test with door 241 output logic signal.
Switch S 2 can open or close the first relay, when switch S 2 closes, second relay is started working, that make the second coil of the second relay can respond to logic control element 240 with output signal that is door 242 when being also 1 with door 242 output logic signal (, when non-test personnel have passed through outer fence and have passed through internal layer fence), the second contact KM2 of the second relay disconnects.Therefore, power-down circuit disconnects the connection between high voltage source and high-tension apparatus.In addition, power-down circuit comprises multiple fuse 140-1, fuse 140-2, fuse 140-3, fuse 140-4, when power-down circuit voltage and/or electric current too high time, fuse 140-4 can be fused thus be protected power-down circuit.In addition, when high voltage source occurs abnormal, the fuse 140-1 be connected with three phase mains respectively, fuse 140-2, fuse 140-3 can be fused and the connection between high voltage source and each load is disconnected.Meanwhile, for the internal layer area alarm lamp 172 of the device of security protection when being also used to refer to high voltage test with door 242 output logic signal.
The present invention is not limited to above-mentioned particular implementation example; do not deviating under the present invention's spirit and real situation thereof; those skilled in the art can make various corresponding change and distortion according to the present invention, but these corresponding changes and distortion all should belong within claims protection range of the present invention.
Claims (10)
1. an infrared ray safety monitoring device, is characterized in that, comprises infrared signal generation unit, signal monitoring unit, detection signal processing unit, logic control element and tripping alarm unit,
Described infrared signal generation unit is configured to produce the infrared ray fence arranged around high-tension apparatus;
Described signal monitoring unit comprises: at least one infrared monitor control circuit, it is configured to monitor described infrared ray fence, and generate detection signal when described infrared ray fence is blocked because foreign object passes through, and described detection signal is transferred to described detection signal processing unit; And high voltage source signal extracting circuit, it is configured to the power supply electrifying signal electric power signal from electrical network being exported after step-down transformer step-down, rectification and filtering low-voltage direct;
Described detection signal processing unit is connected with described signal monitoring unit, and it is configured to described detection signal to be converted to fixed level signal by pulse signal;
Described logic control element is configured to when receiving described fixed level signal and described power supply electrifying signal, output logic control signal after logical operation;
Described tripping alarm cell location is the logic control signal that described logic control element exports is transferred to power-down circuit and/or warning circuit to disconnect described high-tension apparatus and/or to give the alarm.
2. infrared ray safety monitoring device according to claim 1, is characterized in that,
Described infrared signal generation unit is configured to produce the internal layer infrared ray fence and outer infrared ray fence arranged around high-tension apparatus respectively;
Described detection signal can comprise outer detection signal and internal layer detection signal, and when outer infrared ray fence is blocked, described outer detection signal is low level, and when outer infrared ray fence is not blocked, described outer detection signal is high level; When internal layer infrared ray fence is blocked, described internal layer detection signal is low level, and when internal layer infrared ray fence is not blocked, described internal layer detection signal is high level.
3. infrared ray safety monitoring device according to claim 2, is characterized in that, described detection signal processing unit comprises:
Latch chip, its first input end receives described outer detection signal, and its second input receives described internal layer detection signal, and its first output exports the outer fixed level signal corresponding to described outer detection signal, its second output exports the internal layer fixed level signal corresponding to described internal layer detection signal, further, the output enable signal end of latch chip is placed in low level;
Not gate, its input receives described outer fixed level signal, and its output is connected to the latch enable signal end of described latch chip;
Manual reset switch, one end ground connection, between the described outer output that its other end is connected to described latch chip and described not gate.
4. infrared ray safety monitoring device according to claim 3, it is characterized in that, described logic control element comprise first with door and second and door, described first receives described outer fixed level signal and described power supply electrifying signal with door and exports outer logic control signal; Described second receives described outer logic control signal and described internal layer fixed level signal with door, and exports internal layer logic control signal.
5. infrared ray safety monitoring device according to claim 4, it is characterized in that, described first is connected to warning circuit with the output of door, and described second is connected to power-down circuit with the output of door or is connected to described warning circuit and power-down circuit simultaneously.
6. the infrared ray safety monitoring device according to claim 4 or 5, it is characterized in that, described warning circuit comprises the contact of interconnective audible-visual annunciator and the first relay, described power-down circuit comprises the contact of the second relay making described high-tension apparatus power-off, wherein, coil-induced described first of described first relay with the output signal of door, and coil-induced described second of described second relay with the output signal of door.
7. infrared ray safety monitoring device according to claim 6, is characterized in that, described warning circuit also comprises outer indicator light and internal layer indicator light, when described first relay is connected, described outer indicator light is lighted, and when described second relay is connected, described internal layer indicator light is lighted.
8. infrared ray safety monitoring device as claimed in any of claims 2 to 5, it is characterized in that, described outer detection signal and described internal layer detection signal are 0 to 0.5V when low level, and described outer detection signal and described internal layer detection signal are 0.5V to 2.5V when high level.
9. be used for a device for security protection during high voltage test, it comprises:
Infrared ray safety monitoring device according to any one of claim 1 to 8;
Auxiliary power circuit, it is configured to the electric power from electrical network to be converted to constant voltage low-voltage DC, and this constant voltage low-voltage DC is supplied to described infrared ray safety monitoring device.
10. be used for the device of security protection during high voltage test according to claim 9, it is characterized in that, the device being used for security protection during described high voltage test has 380V and 220V power input and 380V and 220V power output end.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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