CN208224389U - A kind of novel railway carriage DC48V type insulation monitoring system - Google Patents
A kind of novel railway carriage DC48V type insulation monitoring system Download PDFInfo
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- CN208224389U CN208224389U CN201820755734.4U CN201820755734U CN208224389U CN 208224389 U CN208224389 U CN 208224389U CN 201820755734 U CN201820755734 U CN 201820755734U CN 208224389 U CN208224389 U CN 208224389U
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- module
- positive
- negative busbar
- dc48v
- insulation resistance
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Abstract
The utility model relates to a kind of novel railway carriage DC48V type insulation monitoring systems, belong to insulating monitoring technical field, including uneven bridge circuit, conditioning circuit module, isolation module, main control module, usb interface module, EEPROM memory module, sound alarm module, state indicator module, display module, network communication module, bluetooth module, it is high that the utility model can effectively play insulation measurement precision, strong antijamming capability, it is easy to operate and have calibration clock, regular self-test, data storage, the functions such as network communication, include embedded Control, USB storage, the technologies such as wireless blue tooth communication, it can be widely applied to the insulating monitoring of passenger train DC48V power supply system, it can real-time detection positive and negative busbar insulation against ground resistance value.
Description
Technical field
The utility model relates to a kind of novel railway carriage DC48V type insulation monitoring systems, belong to insulating monitoring technical field.
Background technique
In all kinds of fire incidents that passenger train occurred in recent years, up to 70% is caused by DC48V electrical malfunction
, the first killer of bus safety is had become with the fire that electric fault causes.Since current breaker of plastic casing uses Thermomagnetic type
Protection carries out overload protection using sheet metal, and precision is poor；And the fuse of leakage circuit breakers use, non intelligent electric leakage are opened
Technology seriously falls behind the fire alarm system of the compositions such as pass, Thermomagnetic type molded-case switch again, has a single function, and lacks comprehensive safety and protects
Shield effect, therefore when the failures such as overload, short circuit, electric leakage, over-voltage, under-voltage occurs in power supply line, it can not make fast and accurately
Reaction, can not fundamentally prevent the generation of fire.The type insulation monitoring system of early stage is substantially all using small signal injection method,
By detecting out-of-balance current, that is, leakage current, signal then will test by data line again send to host and do response processing, the party
Formula structure is simple, at high cost, easily causes equipment malfunction or jamming equipment, cannot accurately alarm.Direct current system is passenger train
One key components of power supply system are to signalling arrangement, automatic device, emergency lighting, emergency power supply and breaker portion
Divide and the equipment of DC power supply is provided.Direct current system is an independent power supply, it is not by generator, station service and system operation side
The influence of formula is can to continue offer the important of DC power supply by backup power supply in the case where external alternating current interrupts and set
It is standby.DC power supply is very huge as the emergency power supply and control signal power source, its branch feeding network of electric equipments
Greatly, common failure is ground fault.Under normal circumstances, one point earth has no effect on the operation of direct current system, but if
Earth fault cannot be quickly found and repaired, another point ground fault is then caused, it is possible to cause signal circuit, control
The malfunctions such as circuit processed, protective relaying device expand fault coverage, so D.C. isolation monitoring is very necessary.However it is existing
There is poor anti jamming capability, insulation measurements to be not allowed in solution for DC48V insulation monitoring device, system clock deviation
Accumulation, can not network-control the problems such as.
Utility model content
Technical problem to be solved in the utility model is to realize that strong antijamming capability, insulation measurement precision are high, grasp
Make easy problem, proposes a kind of novel railway carriage DC48V type insulation monitoring system.
The technical scheme adopted by the utility model to solve the technical problem is as follows:
The utility model proposes a kind of novel railway carriage DC48V type insulation monitoring systems, including sequentially connected imbalance
Bridge circuit, conditioning circuit module, isolation module, main control module and usb interface module, EEPROM memory module, sound report
Alert module, state indicator module, display module, network communication module, bluetooth module；Wherein, the uneven bridge circuit will
Positive and negative busbar ground insulation resistance value is converted to positive and negative busbar voltage signal and positive and negative busbar voltage signal is transmitted to conditioning electricity
Road module；The conditioning circuit module, for positive and negative busbar voltage signal to be carried out decompression processing, filtering processing and by positive and negative mother
Line voltage signal is transmitted to isolation module；The isolation module, for positive and negative busbar voltage signal to be carried out voltage isolation amplifier
And positive and negative busbar voltage signal is transmitted to main control module；The main control module is gone forward side by side for acquiring positive and negative busbar voltage signal
Row analog-to-digital conversion is simultaneously converted to positive and negative busbar ground insulation resistance value by calculating；Meanwhile analyzing positive and negative busbar ground insulation electricity
The size of resistance value and door threshold value；The usb interface module, for positive and negative busbar ground insulation resistance value to be passed through USB interface end
It is transmitted to External memory equipment；The EEPROM memory module, for carrying out real-time storage positive and negative busbar ground insulation resistance value；
The sound alarm module triggers audible alarm when positive and negative busbar ground insulation resistance value is less than door threshold value；The state refers to
Show module, when positive and negative busbar ground insulation resistance value is greater than door threshold value, display system normal operating conditions；When positive and negative busbar connects
When ground insulating resistance value is less than door threshold value, display system abnormal operating state；The display module, for showing positive and negative busbar
Ground insulation resistance value, system clock, working state of system；The network communication module, for passing through external interface end and PC
End carries out network communication；The bluetooth module, for being communicated with external mobile communication equipment end.
Further, as the prioritization scheme of the utility model, the imbalance bridge circuit includes the first insulation resistance, the
Two insulation resistances, the first to the 6th resistance, first to third switch；Wherein, one end of the first insulation resistance is electric with first respectively
One end connection of one end of resistance, one end of the 5th resistance, first switch, the other end of first switch are another with first resistor respectively
One end, 3rd resistor one end connection, the other end of 3rd resistor respectively with one end of second switch, third switch one end,
One end of 4th resistance connects, and the other end of the 4th resistance and one end of second resistance connect, the other end difference of second resistance
Connect with one end of one end of the 6th resistance, the second insulation resistance, the other end of the second insulation resistance respectively with the first insulated electro
One end connection of the other end of resistance, one end of second switch, third switch, the other end that third switchs are another with the 6th resistance
End connection, the other end of second switch are connect with the other end of the 5th resistance.
Further, as the prioritization scheme of the utility model, the isolation module is the isolation error of ADUM4190 model
Amplifier.
Further, as the prioritization scheme of the utility model, the main control module is the main control of STM32F429 model
Device.
Further, as the prioritization scheme of the utility model, the usb interface module is USB118AD module.
Further, as the prioritization scheme of the utility model, the EEPROM memory module is M24M02-DR model
Memory.
Further, as the prioritization scheme of the utility model, the display module is LCD capacitance plate.
Further, as the prioritization scheme of the utility model, the bluetooth module is the blue-tooth device of HC-05 model.
The utility model uses the above technological means, has following technical effect that
The utility model has insulation measurement precision height, strong antijamming capability, easy to operate, practical, sexual valence
Than high, store function, self-checking function, network and function of Bluetooth communication, passenger train DC48V power supply system can be widely applied to
Insulating monitoring, can real-time detection positive and negative busbar insulation against ground resistance value.
Detailed description of the invention
Fig. 1 is the system construction drawing of the utility model.
Fig. 2 is the uneven bridge circuit figure of the utility model.
Specific embodiment
The technical solution of the utility model is described in further detail with reference to the accompanying drawing:
As shown in Figure 1, the utility model proposes a kind of novel railway carriage DC48V type insulation monitoring system, including injustice
Weigh bridge circuit, conditioning circuit module, isolation module, main control module, usb interface module, EEPROM memory module, sound report
Alert module, state indicator module, display module, network communication module, bluetooth module；Wherein, the output of uneven bridge circuit
End is connect with the input terminal of conditioning circuit module, and the output end of conditioning circuit module and the input terminal of isolation module connect, isolation
The input terminal of the output end of module and main control module connects, the output end of main control module respectively with the input of usb interface module
End, the input terminal of EEPROM memory module, the input terminal of sound alarm module, the input terminal of state indicator module, display module
Input terminal, the input terminal of network communication module, bluetooth module input terminal connection；Uneven bridge circuit, being used for will be positive and negative
Busbar grounding insulating resistance value is converted to positive and negative busbar voltage signal and positive and negative busbar voltage signal is transmitted to conditioning circuit mould
Block；Conditioning circuit module, for positive and negative busbar voltage signal to be carried out decompression processing, filtering processing and believes positive and negative busbar voltage
Number it is transmitted to isolation module；Isolation module, for positive and negative busbar voltage signal to be carried out voltage isolation amplifier and by positive and negative busbar
Voltage signal is transmitted to main control module；Main control module, for acquiring positive and negative busbar voltage signal and carrying out analog-to-digital conversion and pass through
Calculating is converted to positive and negative busbar ground insulation resistance value；Meanwhile analyzing the big of positive and negative busbar ground insulation resistance value and door threshold value
It is small；Usb interface module, for positive and negative busbar ground insulation resistance value to be transmitted to External memory equipment by USB interface end；
EEPROM memory module, for carrying out real-time storage positive and negative busbar ground insulation resistance value；Sound alarm module works as positive and negative busbar
Ground insulation resistance value triggers audible alarm when being less than door threshold value；State indicator module, when positive and negative busbar ground insulation resistance value
When greater than door threshold value, display system normal operating conditions；When positive and negative busbar ground insulation resistance value is less than door threshold value, display system
System abnormal operating state；Display module, for showing positive and negative busbar ground insulation resistance value, system clock, system work shape
State；Network communication module, for carrying out network communication by external interface end and the end PC；Bluetooth module, for mobile with outside
Communication equipment end is communicated.
Wherein, isolation module is the isolation error amplifier of ADUM4190 model, and the signal after conditioning is passed through
ADUM4190 amplifier carries out isolation processing, is sent into master controller, effectively avoids interference of the power supply to system；Main control module is
The positive and negative busbar insulating resistance being calculated is compared by the master controller of STM32F429 model with given threshold 1k Ω；
Usb interface module is USB118AD module, and the data of system storage can have the storage device downloads of USB interface by USB flash disk etc.；
EEPROM memory module be M24M02-DR model memory, can real-time storage data and for user download；Audible alarm mould
Block, the triggering alarm when bus insulation against ground resistance value is less than given threshold 1k Ω, volume is in 70db or so；State indicator module,
When system is working properly, the indicator light is always on for blue transition, and when bus insulation against ground resistance value is less than 1k Ω, red alarm lamp is every 1
Second flashing is primary；
Display module is LCD capacitance plate, selects the TFT colour capacitor LCD screen of 5 cun of 800*480 dot matrix, RGB888, real
When display system record data, the working condition of system clock and system；Network communication module can pass through RS232 interface
Network communication is carried out with user PC, carries out software upgrading, while remote system maintenance can also be carried out by RS485 bus；Bluetooth
Module is the blue-tooth device of HC-05 model, can be communicated with user with the mobile communication equipment of Bluetooth function, when to system
Clock is calibrated.
As shown in Fig. 2, for uneven bridge circuit figure, RA、RBRespectively indicate the insulation resistance between positive and negative busbar and ground.
U1、U2Respectively indicate K1Resistance R when closureA、RBUpper voltage value, U1′、U2' respectively indicate and work as K1R when disconnectionA、RBOn voltage value.
Pass through control K when work1On-off change positive and negative busbar voltage in resistance RA、RBUpper intrinsic standoff ratio.
Work as K1When connection, it can obtain:
Work as K1When disconnection, it can obtain:
Formula (1), (2) simultaneous can solve RA、RBResistance value.
The specific self-checking function of system, system can generate a self-test signal by single-chip microcontroller at regular intervals, be respectively turned on not
Relay K in balance bridge type circuit2、K3, by RC、RDBridge circuit is accessed, wherein RC、RDResistance value is disposed as 800 Ω, then this
When positive and negative busbar insulation against ground resistance be less than given threshold 1k Ω, can alarm be triggered with this verifying attachment, it is ensured that device is in
Normal condition.
When a system is powered up, it is introduced into Auto-Sensing Mode.Main control module issues control signal first, connects switch K2, disconnect
Switch K3, carry out first time self-test；Then switch K is connected again3, disconnect switch K2, carry out second of self-test.If self-test twice
Process results in sound light alarming circuit and issues alarm signal, then device is normal.
Disconnect switch K2, K3, system starts normally to monitor.In each duty cycle, system first connects relay K1,
Main control module carries out first time sampling to conditioned positive and negative busbar voltage at this time, obtains first group of positive and negative busbar voltage U1、
U2；It is then turned off relay K1, then second is carried out to positive and negative busbar voltage and is sampled, obtain second group of positive and negative busbar voltage U1′、
U2', the insulation of positive and negative busbar can be calculated in main control module by the calculation formula (1) of uneven bridge circuit, (2)
Resistance RA、RB.Equipment constantly repeats this period when working normally.
The above is only the embodiments of the present invention, and the description thereof is more specific and detailed, but can not therefore understand
For a limitation on the scope of the patent of the present invention.It should be pointed out that for those of ordinary skill in the art, not taking off
Under the premise of from the utility model design, various modifications and improvements can be made, these belong to the protection of the utility model
Range.
Claims (8)
1. a kind of novel railway carriage DC48V type insulation monitoring system, it is characterised in that: including sequentially connected uneven bridge-type electricity
Road, conditioning circuit module, isolation module, main control module and usb interface module, EEPROM memory module, audible alarm mould
Block, state indicator module, display module, network communication module, bluetooth module；
The imbalance bridge circuit, for positive and negative busbar ground insulation resistance value to be converted to positive and negative busbar voltage signal and is incited somebody to action
Positive and negative busbar voltage signal is transmitted to conditioning circuit module；
The conditioning circuit module, for positive and negative busbar voltage signal to be carried out decompression processing, filtering processing and by positive and negative busbar
Voltage signal is transmitted to isolation module；
The isolation module, for positive and negative busbar voltage signal to be carried out voltage isolation amplifier and passes positive and negative busbar voltage signal
Transport to main control module；
The main control module is converted to positive and negative mother by calculating after analog-to-digital conversion for acquiring positive and negative busbar voltage signal and carrying out
Line ground insulation resistance value；Meanwhile analyzing the size of positive and negative busbar ground insulation resistance value and door threshold value；
The usb interface module is set for positive and negative busbar ground insulation resistance value to be transmitted to external storage by USB interface end
It is standby；
The EEPROM memory module, for carrying out real-time storage positive and negative busbar ground insulation resistance value；
The sound alarm module triggers audible alarm when positive and negative busbar ground insulation resistance value is less than door threshold value；
The state indicator module, when positive and negative busbar ground insulation resistance value is greater than door threshold value, display system works normally shape
State；When positive and negative busbar ground insulation resistance value is less than door threshold value, display system abnormal operating state；
The display module, for showing positive and negative busbar ground insulation resistance value, system clock, working state of system；
The network communication module, for carrying out network communication by external interface end and the end PC；
The bluetooth module, for being communicated with external mobile communication equipment end.
2. novel railway carriage DC48V type insulation monitoring system according to claim 1, it is characterised in that: the imbalance
Bridge circuit includes the first insulation resistance, the second insulation resistance, the first to the 6th resistance, first to third switch；Wherein, first
One end of insulation resistance is connect with one end of one end of first resistor, one end of the 5th resistance, first switch respectively, first switch
The other end connect respectively with one end of the other end of first resistor, 3rd resistor, the other end of 3rd resistor is respectively with second
One end connection of one end of switch, one end of third switch, the 4th resistance, the other end of the 4th resistance and one end of second resistance
Connection, the other end of second resistance are connect with one end of one end of the 6th resistance, the second insulation resistance respectively, the second insulation resistance
The other end respectively with the other end of the first insulation resistance, one end of second switch, third switch one end connect, third switch
The other end connect with the other end of the 6th resistance, the other end of second switch is connect with the other end of the 5th resistance.
3. novel railway carriage DC48V type insulation monitoring system according to claim 1, it is characterised in that: the isolation mode
Block is the isolation error amplifier of ADUM4190 model.
4. novel railway carriage DC48V type insulation monitoring system according to claim 1, it is characterised in that: the master control mould
Block is the master controller of STM32F429 model.
5. novel railway carriage DC48V type insulation monitoring system according to claim 1, it is characterised in that: the USB interface
Module is USB118AD module.
6. novel railway carriage DC48V type insulation monitoring system according to claim 1, it is characterised in that: the EEPROM
Memory module is the memory of M24M02-DR model.
7. novel railway carriage DC48V type insulation monitoring system according to claim 1, it is characterised in that: the display mould
Block is LCD capacitance plate.
8. novel railway carriage DC48V type insulation monitoring system according to claim 1, it is characterised in that: the bluetooth mould
Block is the blue-tooth device of HC-05 model.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820755734.4U CN208224389U (en) | 2018-05-18 | 2018-05-18 | A kind of novel railway carriage DC48V type insulation monitoring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820755734.4U CN208224389U (en) | 2018-05-18 | 2018-05-18 | A kind of novel railway carriage DC48V type insulation monitoring system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208224389U true CN208224389U (en) | 2018-12-11 |
Family
ID=64509252
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820755734.4U Expired - Fee Related CN208224389U (en) | 2018-05-18 | 2018-05-18 | A kind of novel railway carriage DC48V type insulation monitoring system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208224389U (en) |
-
2018
- 2018-05-18 CN CN201820755734.4U patent/CN208224389U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181211 Termination date: 20200518 |
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| CF01 | Termination of patent right due to non-payment of annual fee |