CN104502803B - A kind of power network monitoring apparatus and system - Google Patents
A kind of power network monitoring apparatus and system Download PDFInfo
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- CN104502803B CN104502803B CN201410817308.5A CN201410817308A CN104502803B CN 104502803 B CN104502803 B CN 104502803B CN 201410817308 A CN201410817308 A CN 201410817308A CN 104502803 B CN104502803 B CN 104502803B
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Abstract
The present invention relates to power network monitoring technical field, more particularly to a kind of power network monitoring apparatus and system.The device includes：Power network plate positioned at the junk relay of monitoring unit and for exporting alternating-current detection signal；It is located outside the trackside controlling switch and the first diode of trackside；Monitoring power network unit in monitoring foreign bodies power network；Electric capacity is parallel between the input contact of junk relay and output contact；The output end of power network plate is connected by cable with trackside controlling switch, and the output end of trackside controlling switch is connected with monitoring the input of power network unit；The output end of monitoring power network unit is connected with the anode of the first diode；The negative electrode of first diode is connected by cable with the magnet coil of junk relay, and the normally opened contact of junk relay is connected with power network plate., can be according to the foreign body intrusion of the condition adjudgement monitoring foreign bodies power network of the junk relay set in monitoring unit, short circuit and the failure of swinging cross using the power network monitoring apparatus and system of the embodiment of the present invention.
Description
Technical field
The present invention relates to power network monitoring technical field, in particular to a kind of power network monitoring apparatus and system.
Background technology
China Railway High-speed is in the period developed rapidly.The disaster that Along Railway runs into may have high wind, snowfall, flood
Water, earthquake, fire and falling rocks etc., set up peace of the railway disaster prevention safety monitoring system to rail track during railway construction
Row for the national games is most important.
Current railway disaster prevention safety monitoring system, mainly includes wind monitoring subsystem, rainfall monitoring subsystem, snow depth prison
Survey subsystem, earthquake monitoring subsystem and monitoring foreign bodies subsystem, each monitoring subsystem respectively to wind, rain, snow, earthquake with
And the situation such as foreign body intrusion carries out real-time monitoring alarming, the monitoring information that TD person obtains according to disaster prevention safety monitoring system
Command safe train operation；The monitoring information that Gong Wu maintenance departments provide according to disaster prevention safety monitoring system, carries out infrastructure
Inspection, speedily carry out rescue work and maintain work.
As Fig. 1 shows the structural representation of monitoring foreign bodies subsystem, it is seen that monitoring foreign bodies subsystem is related
Equipment includes monitoring unit 1, monitoring foreign bodies power network 3 and train control system 8, and wherein monitoring unit 1 is used for into monitoring foreign bodies power network 3
Foreign body detection signal is sent, and for receiving the foreign bodies detection feedback signal of the on off operating mode return according to monitoring foreign bodies power network 3.
When monitoring foreign bodies power network 3 is off by foreign body intrusion, monitoring unit 1 is according to foreign bodies detection feedback signal nematic control
System 8 sends foreign body intrusion alarm, and train control system 8 alerts according to foreign body intrusion and is driven control to row control equipment.
From the above, it is seen that the break-make that the monitoring foreign bodies subsystem in correlation technique passes through monitoring foreign bodies power network 3
Limit situation of invading to foreign matter judges, but is needed to use largely in the connection procedure of monitoring unit 1 and monitoring foreign bodies power network 3
Cable run, the failure such as the swinging cross between cable run may also can make it that monitoring foreign bodies power network 3 is in suspension state, and
The failure as caused by cable run swinging cross etc. can not be monitored at monitoring unit 1.
The content of the invention
It is an object of the invention to provide a kind of power network monitoring apparatus and system, to realize the inspection to power network mix line fault
Survey.
In a first aspect, the embodiments of the invention provide a kind of power network monitoring device, including：Positioned at monitoring unit junk after
Electrical equipment and the power network plate for exporting alternating-current detection signal；It is located outside the trackside controlling switch of trackside and for half-wave shaping
First diode；And, the monitoring power network unit in monitoring foreign bodies power network；Wherein, the input of the junk relay is touched
Electric capacity is parallel between point and output contact；The input that the output end of the power network plate passes through cable and the trackside controlling switch
End connection, the output end of the trackside controlling switch is connected with the input of the monitoring power network unit；The monitoring power network list
The output end of member is connected with the anode of first diode；The negative electrode of first diode by cable and the junk after
The magnet coil connection of electrical equipment, the normally opened contact of the junk relay is connected with the power network plate.
With reference in a first aspect, the embodiments of the invention provide the possible embodiment of the first of first aspect, wherein
Also include the first lightning protection circuit positioned at monitoring unit in power network monitoring device；First lightning protection circuit is connected to the power network
On the input cable of the magnet coil of the output cable of plate and the junk relay.
With reference in a first aspect, the embodiments of the invention provide the possible embodiment of second of first aspect, wherein,
Also include the second lightning protection circuit in power network monitoring device；Second lightning protection circuit is connected to the output of the trackside controlling switch
On the negative electrode output cable of cable and first diode.
With reference in a first aspect, the embodiments of the invention provide the possible embodiment of the third of first aspect, wherein, institute
Stating power network plate includes the first change-over circuit, the second change-over circuit and switching relay；The input of first change-over circuit with
Dc source is connected, and output end is connected with the switching relay, for driving the switching relay to connect, and exports described
Alternating-current detection signal；The input of second change-over circuit is connected by slow switch circuit with the dc source；Described second
The output end of change-over circuit is connected with the switching relay, is switched for described after relay is connected and the first conversion electricity
Switch described in the failure of road after relay disconnection, export the alternating-current detection signal.
With reference to the third possible embodiment of first aspect, the embodiments of the invention provide the 4th of first aspect kind
Possible embodiment, wherein, the power network plate also includes the first Power Monitoring Unit and second source monitoring module；Described
One Power Monitoring Unit is connected with the output end of first change-over circuit；The second source monitoring module with described second turn
Change the output end connection of circuit.
With reference to the 4th kind of possible embodiment of first aspect, the embodiments of the invention provide the 5th of first aspect kind
Possible embodiment, wherein, first Power Monitoring Unit, including：First power supply status supervisory circuit and the first power supply
Status indicator lamp；The first power supply status supervisory circuit and first indicator of the power supply status and first change-over circuit
Output end it is in parallel.
With reference to the 4th kind of possible embodiment of first aspect, the embodiments of the invention provide the 6th of first aspect kind
Possible embodiment, wherein, the second source monitoring module, including：Second source status monitor circuit and second source
Status indicator lamp；The second source status monitor circuit and the second source status indicator lamp and second change-over circuit
Output end it is in parallel.
With reference to the third possible embodiment of first aspect, the embodiments of the invention provide the 7th of first aspect kind
Possible embodiment, wherein, the output end of the switching relay is connected by protection circuit with connector.
With reference to the 7th kind of possible embodiment of first aspect, the embodiments of the invention provide the 8th of first aspect kind
Possible embodiment, wherein, the output end of the switching relay includes cathode output end and cathode output end；The positive pole
The first adjustable resistance is provided with output end, the output end of first adjustable resistance is connected with the protection circuit；It is described negative
The second adjustable resistance and the second diode are provided with the output end of pole；The input and the negative pole of second adjustable resistance are defeated
Go out end connection, output end is connected with the negative electrode of second diode, anode and the protection circuit of second diode
Connection.
Second aspect, the embodiments of the invention provide a kind of grid monitoring system, including two above-mentioned power network monitoring devices；
Two power network monitoring device laid out in parallel.
Power network monitoring apparatus and system provided in an embodiment of the present invention, under normal operating conditions, the friendship of power network plate output
Stream detection signal is deposited after trackside controlling switch, halfwave rectifier of the monitoring power network unit by the first diode on electric capacity
Storing up electricity can form voltage so that junk relay normally opened contact inhale and；When the output end and trackside controlling switch of power network plate
When short circuit occurs in cable between input, junk relay two ends are alternating voltage, and junk relay is not picked up；When monitoring electricity
When foreign body intrusion occurs in net unit, the voltage on electric capacity is reduced to zero, and the normally opened contact of junk relay is gone to by inhaling with state
Full state；When there is mix line fault in the cable between the output end of power network plate and the input of trackside controlling switch, junk
The normally opened contact of relay can not inhale and.Therefore power network is entered using the power network monitoring apparatus and system of the embodiment of the present invention
During row monitoring, can according to the foreign body intrusion of the condition adjudgement monitoring foreign bodies power network of the junk relay set in monitoring unit,
Short circuit and the failure of swinging cross, overcoming the monitoring foreign bodies subsystem in correlation technique can not supervise to the failure as caused by swinging cross
The technical problem of survey.
To enable the above objects, features and advantages of the present invention to become apparent, preferred embodiment cited below particularly, and coordinate
Appended accompanying drawing, is described in detail below.
Brief description of the drawings
, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical scheme of the prior art
The accompanying drawing used required in embodiment or description of the prior art is briefly described, it should be apparent that, in describing below
Accompanying drawing is some embodiments of the present invention, for those of ordinary skill in the art, before creative work is not paid
Put, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 shows the structural representation of monitoring foreign bodies subsystem in correlation technique；
Fig. 2 shows the structural representation of power network monitoring device in the embodiment of the present invention；
Fig. 3 shows the structural representation of power network plate in the embodiment of the present invention；
Fig. 4 shows the part-structure schematic diagram of power network plate in the embodiment of the present invention；
Fig. 5 shows the structural representation of grid monitoring system in the embodiment of the present invention；
Fig. 6 shows the structure of the railway disaster prevention safety monitoring system for the grid monitoring system that make use of the embodiment of the present invention
Schematic diagram.
Embodiment
Below in conjunction with accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Ground is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Generally exist
The component of the embodiment of the present invention described and illustrated in accompanying drawing can be arranged and designed with a variety of configurations herein.Cause
This, the detailed description of the embodiments of the invention to providing in the accompanying drawings is not intended to limit claimed invention below
Scope, but it is merely representative of the selected embodiment of the present invention.Based on embodiments of the invention, those skilled in the art are not doing
The every other embodiment obtained on the premise of going out creative work, belongs to the scope of protection of the invention.
The embodiments of the invention provide a kind of power network monitoring device, as shown in Fig. 2 including：Positioned at the junk of monitoring unit 1
Relay 11 and the power network plate 12 for exporting alternating-current detection signal；It is located outside the trackside controlling switch 21 of trackside and for half
The diode D1 of ripple shaping；And the monitoring power network unit 31 in monitoring foreign bodies power network 3；Wherein, junk relay 11
Electric capacity 13 is parallel between input contact and output contact；The output end of power network plate 12 passes through cable and trackside controlling switch 21
Input is connected, and the output end of trackside controlling switch 21 is connected with monitoring the input of power network unit 31；Monitor power network unit 31
Output end be connected with diode D1 anode；Diode D1 negative electrode is connected by the magnet coil of cable and junk relay 11
Connect, the normally opened contact of junk relay 11 is connected with power network plate 12.
Power network plate 12 in above-mentioned power network monitoring device, monitoring unit 1 sends alternating-current detection signal, it is preferable that power network
Plate 12 sends AC110V/50Hz alternating-current detection signal；Alternating-current detection signal by cable transmission to trackside controlling switch 21, it
The monitoring power network unit 31 of monitoring foreign bodies power network 3 is input to afterwards, and the output end of monitoring power network unit 31 is by the half of diode D1
After ripple rectification, on the magnet coil for returning to junk relay 11, and electric energy is stored on electric capacity 13, form driving junk relay
The driving voltage of 11 actions.On junk relay 11 during no applied voltage, the common and normally-closed contact of junk relay 11
Inhale and, when on the magnet coil of junk relay 11 formed driving voltage after, the common of junk relay 11 with it is normally opened touch
Point inhale and.
When the monitoring power network unit 31 of monitoring foreign bodies power network 3 is disconnected by foreign body intrusion, monitoring power network unit 31 is without letter
Number output, does not have the accumulation of electric charge on the electric capacity 13 being parallel on the magnet coil of junk relay 11, junk relay 11 it is normal
Open contact disconnection.
When there is short circuit in the cable in power network monitoring device, when such as NET+ and NET- is short-circuit, what power network plate 12 was exported
Alternating-current detection signal directly is directly output to be parallel to the magnet coil of junk relay 11 without diode D1 halfwave rectifier
On electric capacity 13 on, AC signal can not accumulate on electric capacity 13 and form driving voltage, and the normally opened contact of junk relay 11 breaks
Open.
When the cable in power network monitoring device has swinging cross, such as NET+ and NET- swinging cross, power network monitoring device are opened certainly
Start shipment and go, the normally opened contact of junk relay 11 will not inhale and.
It can thus be seen that when being monitored using the power network monitoring device of the embodiment of the present invention to power network, can
The failure according to present in the suction of junk relay 11 and condition adjudgement power network, for example, when junk relay 11 can not be inhaled
And when, it is possible to determine that swinging cross is occurred in that in power network, when junk relay 11 is changed into by suction and state to be fallen, it is possible to determine that different
Foreign body intrusion is occurred in that in thing monitoring power network 3 or occurs in that cable short circuit.
The power network monitoring device of the embodiment of the present invention, as shown in Fig. 2 also including the first thunder-lightning positioned at monitoring unit 1
Road 14；First lightning protection circuit 14 is connected to the input cable of the output cable of power network plate 12 and the magnet coil of junk relay 11
On.
Power network monitoring device as shown in Figure 2, in addition to the second lightning protection circuit 23；Second lightning protection circuit 23 is connected to trackside control
On the output cable of system switch 21 and diode D1 negative electrode output cable.
Lightning damage can be avoided by the first lightning protection circuit 14 and the second lightning protection circuit 23 of setting.
As Fig. 3 shows the concrete structure schematic diagram of power network plate in the embodiment of the present invention.
From figure 3, it can be seen that power network plate includes the first change-over circuit 44, the second change-over circuit 45 and switching relay
48；The input of first change-over circuit 44 is connected with dc source 41, and output end is connected with the switching relay 48 set, is used for
Driving switching relay 48 is connected, and exports alternating-current detection signal；The input of second change-over circuit 45 passes through slow switch circuit 43
It is connected with dc source 41；The output end of second change-over circuit 45 is connected with switching relay 48, is connect for switching relay 48
After logical and after the disconnection of the failover relay 48 of the first change-over circuit 44, alternating-current detection signal is exported.
Switch the circuit diagram for switching switch in relay 48, the first change-over circuit 44 in power network plate as Fig. 4 is shown
And second change-over circuit 45 connect one group of controlling switch respectively, realize the switching of the first change-over circuit and the second change-over circuit.
Above-mentioned power network plate, the first change-over circuit 44 is main operational module, and the second change-over circuit 45 is standby operational module.
When two change-over circuits are normal, the first change-over circuit 44 first it is electric, export alternating-current detection signal, and drive switching relay
48 connect；The second slowly output of change-over circuit 45 after slow switch circuit 43, to be switched relay 48 is exported after connecting, not shadow
Ring the work of the first change-over circuit 44.
When the first 44 failure of change-over circuit, switching relay 48 disconnects, and it is defeated to automatically switch to the second change-over circuit 45
Go out alternating-current detection signal.
In order to monitor the working of the first change-over circuit 44 and the second change-over circuit 45 in power network plate, in circuit board
In be also provided with Power Monitoring Unit corresponding with change-over circuit.
As shown in figure 3, power network plate also includes the first Power Monitoring Unit and second source monitoring module；First Power Supply Monitoring
Module is connected with the output end of the first change-over circuit 44；The output end of second source monitoring module and the second change-over circuit 45 connects
Connect.
As can be seen from Figure 3, the first Power Monitoring Unit, including：First power supply status supervisory circuit 49 and the first power supply
Status indicator lamp 50；First power supply status supervisory circuit 49 and the first indicator of the power supply status 50 are defeated with the first change-over circuit 44
Go out end in parallel.
Also include the first transformer rectifier circuit 46, the input of the first transformer rectifier circuit 46 in first Power Monitoring Unit
It is connected with the output end of the first change-over circuit 44, the alternating-current detection signal for being exported to the first change-over circuit 44 carries out change repoussage
Stream process, and export the indication signal for indicating the working condition of the first change-over circuit 44；First power supply status supervisory circuit 49
And first indicator of the power supply status 50 input it is in parallel with the output end of the first transformer rectifier circuit 46, respectively obtain indicate letter
After number, the instruction of first state change-over circuit running status is carried out, therefore according to the first indicator of the power supply status 50 and the first electricity
The instruction state of source status monitor circuit 49 may determine that whether the running status of the first change-over circuit 44 is normal.
As shown in figure 3, including in second source monitoring module：Second source status monitor circuit 54 and second source shape
State indicator lamp 53；The output of second source status monitor circuit 54 and the change-over circuit 45 of second source status indicator lamp 53 and second
End is in parallel.
Also include the second transformer rectifier circuit 47 in second source monitoring module.The input of second transformer rectifier circuit 47
It is connected with the output end of the second change-over circuit 45, the alternating-current detection signal for being exported to the second change-over circuit 45 carries out change repoussage
Stream process, and export the indication signal for indicating the working condition of the second change-over circuit 45；Second source status monitor circuit 54
And the input of second source status indicator lamp 53 is in parallel with the output end of the second transformer rectifier circuit 47, obtains indicate letter respectively
After number, the instruction of the second state switching circuit running status is carried out, therefore according to the electricity of second source status indicator lamp 53 and second
The instruction state of source status monitor circuit 54 may determine that whether the running status of the second change-over circuit 45 is normal.
As in Fig. 3, the output end of switching relay 48 is connected by protection circuit 55 with connector 56.
As in Fig. 3, the output end of switching relay includes cathode output end and cathode output end；Set on cathode output end
There is the first adjustable resistance 51, the input of the first adjustable resistance 51 is connected with cathode output end, and output end connects with protection circuit 55
Connect；The second adjustable resistance 52 and the second diode D2 are provided with cathode output end；The input of second adjustable resistance 52 is with bearing
Pole output end connection, output end is connected with the second diode D2 negative electrode, and the second diode D2 anode and protection circuit 55 connect
Connect.
As in Fig. 3, the output end of dc source 41, which is connected with protection filter circuit 42, to be used for the straight of dc source output
Stream electricity is filtered.
The embodiment of the present invention additionally provides a kind of grid monitoring system, as shown in figure 5, including two above-mentioned power network monitoring dresses
Put；Two power network monitoring device laid out in parallel.
As Fig. 6 is shown, the structural representation of the railway disaster prevention safety monitoring system of above-mentioned grid monitoring system is utilized.
As shown in fig. 6, the capital equipment in railway disaster prevention safety monitoring system includes monitoring unit 1, monitoring foreign bodies power network 3
And train control system 8.Monitoring unit 1 is that alternating-current detection signal sends and receives processing, the driving of row control signal, in foreign matter status information
The equipment sent；Monitoring foreign bodies power network 3 is carrying alternating-current detection signal, and judges what foreign body intrusion was alerted by power network on off operating mode
Equipment；Train control system 8 is according to foreign body intrusion alarm status information, the equipment of driving row control relay.
The working condition of live monitoring foreign bodies power network is passed through communication link to server 4, server by monitoring unit 1
4 by data storage and are acted upon, and are shown while status data and alarm data are distributed to different terminals by server 4, such as
Track division terminal 5, dispatch terminal 6 and maintenance terminal 7；When the 3 pairs of power network alarms of monitoring foreign bodies power network, the trigger column of monitoring unit 1
Control system 8 is acted, and controls train driving.
As shown in Figures 5 and 6, in monitoring unit 1 the first power network plate 12a and the second power network plate 12b sends exchange respectively
Detect signal, first trackside controlling switch 21a and the of the two-way alternating-current detection signal respectively through cable transmission to outdoor trackside 2
Two trackside controlling switch 21b, are separately input to the first monitoring power network unit 31a and the second monitoring of monitoring foreign bodies power network 3 afterwards
The output end of power network unit 31b, the first monitoring power network unit 31a and the second power network monitoring unit is respectively through diode D1 and two
After pole pipe D2 halfwave rectifier, on the magnet coil that the first junk relay 11a and the second junk relay 11b are returned to respectively,
And electric energy is stored on electric capacity C1 and electric capacity C2 respectively, form driving the first junk relay 11a and the second junk relay 11b
The driving voltage of action.On first junk relay 11a and the second junk relay 11b during no applied voltage, the first junk after
Electrical equipment 11a and the second junk relay 11b common inhaled with normally-closed contact and, as the first junk relay 11a and the
Formed on two junk relay 11b magnet coil after driving voltage, the first junk relay 11a and the second junk relay
11b common inhaled with normally opened contact and.
When the first monitoring power network unit 31a or the second monitoring power network unit 31b of monitoring foreign bodies power network 33 are invaded by foreign matter
When limit disconnects, the monitoring power network unit no signal for being invaded limit by junk is exported, and is parallel on correspondence junk electromagnetic coil relay
Electric capacity on there is no the accumulation of electric charge so that the normally opened contact of the junk relay disconnects, and under such a situation, monitoring unit 1 is only
Alarm signal is sent, control car signal is not sent, red band is not produced.
When the first monitoring power network unit 31a and the second monitoring power network unit 31b of monitoring foreign bodies power network 33 are by foreign matter
When invading limit disconnection, the first monitoring power network unit 31a and the equal no signal outputs of the second monitoring power network unit 31b, the first junk relay
Device 11a and the second junk relay 11b normally opened contact disconnect, under such a situation, and monitoring unit 1 externally sends control train
Running signal, while reporting monitoring foreign bodies to alert by network.
In order to effectively and accurately monitor foreign body intrusion, according to the principle of fault-safety principle, the power network of the embodiment of the present invention
Monitoring system can also detect the failures such as the short circuit of cable run, swinging cross.
When NET1+ and NET1- is short-circuit, the first junk relay 11a normally opened contact disconnects；
When NET2+ and NET2- is short-circuit, the second junk relay 11b normally opened contact disconnects；
When NET1- and NET2+ or NET1+ is with NET2- swinging cross, the first junk relay 11a and the second junk relay
Device 11b can not inhale and；
When NET1+ and NET2+ or NET1- is with NET2- swinging cross, the first junk relay 11a and the second junk relay
Device 11b can not inhale and；
When NET1+ and NET1- or NET2+ is with NET2- swinging cross, the first junk relay 11a and the second junk relay
Device 11b can not inhale and；
According to the sports rule of above-mentioned junk relay contact, the event such as short circuit and swinging cross present in power network can be detected
Barrier.
The power network monitoring apparatus and system of the embodiment of the present invention regard AC signal as detection as exchanged 110V/50Hz signals
Signal, can effectively suppress extraneous common mode disturbances, improve stability, the antijamming capability of power network monitoring apparatus and system, and make
Obtain alternating-current detection signal long transmission distance.
The power network monitoring device of the embodiment of the present invention is according to the principle of railway fault-safety principle, by detecting the short of circuit
The failures such as road, swinging cross, improve the validity and accuracy of monitoring foreign bodies, and power network monitoring apparatus and system can believe failure
Breath is sent to maintenance terminal, reminds maintenance personal to handle in time.
The power network monitoring apparatus and system of the embodiment of the present invention can automatic discrimination power network by foreign body intrusion state, and
Single power network unit breaks down the normal operation for the system that do not interfere with mesh sheet, when receiving double power network units in single mesh sheet
When suffering from foreign body intrusion, parking information, with reference to disaster real-time condition, can be generated according to traffic rule, so that row control
System takes corresponding safeguard procedures, prevents the loss of disaster.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained
Cover within protection scope of the present invention.Therefore, protection scope of the present invention described should be defined by scope of the claims.
Claims (9)
1. a kind of power network monitoring device, it is characterised in that including：
Power network plate positioned at the junk relay of monitoring unit and for exporting alternating-current detection signal；
It is located outside the trackside controlling switch of trackside and the first diode for half-wave shaping；And,
Monitoring power network unit in monitoring foreign bodies power network；
Wherein, it is parallel with electric capacity between the input contact of the junk relay and output contact；
The output end of the power network plate is connected by cable with the input of the trackside controlling switch, the trackside controlling switch
Output end with it is described monitoring power network unit input be connected；The output end of the monitoring power network unit and the one or two pole
The anode connection of pipe；The negative electrode of first diode is connected by cable with the magnet coil of the junk relay, described
The normally opened contact of junk relay is connected with the power network plate；
The power network plate includes the first change-over circuit, the second change-over circuit and switching relay；
The input of first change-over circuit is connected with dc source, and output end is connected with the switching relay, for driving
The dynamic switching relay is connected, and exports the alternating-current detection signal；
The input of second change-over circuit is connected by slow switch circuit with the dc source；Second change-over circuit
Output end is connected with the switching relay, after being connected for the switching relay and described in first conversion circuit failure
Switch after relay disconnection, export the alternating-current detection signal.
2. power network monitoring device according to claim 1, it is characterised in that also including the first lightning protection positioned at monitoring unit
Circuit；
First lightning protection circuit is connected to the defeated of the output cable of the power network plate and the magnet coil of the junk relay
Enter on cable.
3. power network monitoring device according to claim 1, it is characterised in that also including the second lightning protection circuit；
Second lightning protection circuit be connected to the trackside controlling switch output cable and first diode negative electrode it is defeated
Go out on cable.
4. power network monitoring device according to claim 1, it is characterised in that the power network plate also includes the first Power Supply Monitoring
Module and second source monitoring module；
First Power Monitoring Unit is connected with the output end of first change-over circuit；
The second source monitoring module is connected with the output end of second change-over circuit.
5. power network monitoring device according to claim 4, it is characterised in that first Power Monitoring Unit, including：The
One power supply status supervisory circuit and the first indicator of the power supply status；The first power supply status supervisory circuit and first power supply
Status indicator lamp is in parallel with the output end of first change-over circuit.
6. power network monitoring device according to claim 4, it is characterised in that the second source monitoring module, including：The
Two power supply status supervisory circuits and second source status indicator lamp；The second source status monitor circuit and the second source
Status indicator lamp is in parallel with the output end of second change-over circuit.
7. power network monitoring device according to claim 1, it is characterised in that the output end of the switching relay passes through anti-
Protection circuit is connected with connector.
8. power network monitoring device according to claim 7, it is characterised in that the output end of the switching relay is included just
Pole output end and cathode output end；
The first adjustable resistance, output end and the protection circuit of first adjustable resistance are provided with the cathode output end
Connection；
The second adjustable resistance and the second diode are provided with the cathode output end；The input of second adjustable resistance with
The cathode output end connection, output end is connected with the negative electrode of second diode, the anode of second diode and institute
State protection circuit connection.
9. grid monitoring system, it is characterised in that including the power network monitoring device two as described in any one of claim 1 to 8；
Two power network monitoring device laid out in parallel.
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| CN201410817308.5A CN104502803B (en) | 2014-12-24 | 2014-12-24 | A kind of power network monitoring apparatus and system |
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|---|---|---|---|
| CN201410817308.5A CN104502803B (en) | 2014-12-24 | 2014-12-24 | A kind of power network monitoring apparatus and system |
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| CN104502803A CN104502803A (en) | 2015-04-08 |
| CN104502803B true CN104502803B (en) | 2017-10-03 |
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| CN109936194B (en) * | 2019-04-01 | 2023-04-14 | 上海电气集团股份有限公司 | Power supply circuit of battery management system |
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| CN202294876U (en) * | 2011-09-20 | 2012-07-04 | 北京佳讯飞鸿电气股份有限公司 | Improved railway disaster prevention monitoring system |
| CN103144651A (en) * | 2012-12-27 | 2013-06-12 | 北京佳讯飞鸿电气股份有限公司 | Foreign invasion limiting monitoring system orienting to railway disaster prevention |
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| US6895362B2 (en) * | 2003-02-28 | 2005-05-17 | General Electric Company | Active broken rail detection system and method |
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| CN201825064U (en) * | 2010-09-29 | 2011-05-11 | 河南辉煌科技股份有限公司 | Foreign matter intrusion monitoring circuit |
| CN202294876U (en) * | 2011-09-20 | 2012-07-04 | 北京佳讯飞鸿电气股份有限公司 | Improved railway disaster prevention monitoring system |
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