CN205484555U - Portable 240V direct current system insulation monitoring and warning device for communication - Google Patents
Portable 240V direct current system insulation monitoring and warning device for communication Download PDFInfo
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- CN205484555U CN205484555U CN201620031969.XU CN201620031969U CN205484555U CN 205484555 U CN205484555 U CN 205484555U CN 201620031969 U CN201620031969 U CN 201620031969U CN 205484555 U CN205484555 U CN 205484555U
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- leakage current
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Abstract
The utility model relates to a portable 240V direct current system insulation monitoring and warning device for communication, including operation unit, non -equilibrium bridge measuring circuit and human -computer interaction unit, nonequilibrium bridge measuring circuit current input connects 240V direct current system's positive bus -bar, and its current output terminal connects this power supply system's negative busbar, the nonequilibrium bridge is measured electric circuit signal output end and is connected the input of operation unit, operation unit output is connected the human -computer interaction unit, nonequilibrium bridge measuring circuit to the operation unit sends its measuring information, the operation unit carries out insulation resistance and fault detection's calculation according to the information of receiving. This portable 240V direct current system insulation monitoring and warning device for communication simple structure can the accurate insulation resistance who detects direct current system.
Description
Technical field
This utility model relates to communication 240V DC power-supply system field, is specifically related to a kind of portable communications 240V DC power-supply system insulation monitoring and warning device.
Background technology
Communication 240V DC power-supply system can use under the powering mode of various frames, adaptable, has large-scale promotion and be worth in communication network and data IDC machine room, is included in " state key power-saving technology promotes catalogue " by State Assets Administration Committee.But its being clearly distinguished from-48V DC communication power system is exactly dc bus is suspension system over the ground, and suspension system is accomplished by real-time monitoring system dc bus insulation status over the ground over the ground.
The method of existing detection straight-flow system insulation mainly has bridge balance principle and low-frequency acquisition principle.
It is widely used according to the insulation monitoring and warning device that bridge balance principle realizes, but it can not detect the situation when insulation of straight-flow system positive and negative electrode declines on an equal basis；Even if insulation monitoring and warning device is reported to the police, it is not directly available system insulation resistance size over the ground.
It is a kind of new method used in recent years by low-frequency acquisition principle detection earth fault, but the earth resistance that it can be detected by is restricted by straight-flow system distribution capacity over the ground, and low-frequency ac signal is the most interfered by outside, the low-frequency ac signal additionally injected increases the ripple coefficient of voltage of straight-flow system.Visible, all there is some defects being difficult to and overcoming in bridge balance principle and low-frequency acquisition principle.
Utility model content
In order to overcome defect present in above-mentioned prior art, the purpose of this utility model is to provide a kind of simple in construction, can accurately detect the portable communications 240V DC power-supply system insulation monitoring and warning device of the insulation resistance of straight-flow system.
To achieve these goals, this utility model provides a kind of portable communications 240V DC power-supply system insulation monitoring and warning device, including operation processing unit, non-equilibrium bridge measuring circuit and man-machine interaction unit, described non-equilibrium bridge measuring circuit current input terminal connects the positive bus-bar of 240V DC power-supply system, its current output terminal connects the negative busbar of this electric power system, described non-equilibrium bridge measuring circuit signal output part connects the input of described operation processing unit, and described operation processing unit outfan connects described man-machine interaction unit；
Described non-equilibrium bridge measuring circuit sends its measured information to described operation processing unit, and described operation processing unit carries out the calculating of insulation resistance and fault detect according to the information received.
This portable communications 240V DC power-supply system insulation monitoring and warning device uses non-equilibrium bridge measuring circuit to carry out on-the-spot Insulation monitoring and fault detect, have that certainty of measurement is high, execute-in-place convenient, trouble shooting advantage easily, meet by aspects such as the installation and debugging of 240V DC power-supply system, performance detection, trouble shoots in communication and apply requirement.
Further, also include leakage current measurement circuit, the input of described leakage current measurement circuit connects at least one leakage current sensor, described leakage current sensor is positioned in the power supply branch road of this electric power system, described leakage current sensor sends the branch road leakage current situation of power supply branch road in real time to leakage current measurement circuit, and described leakage current measurement circuit signal outfan connects described operation processing unit respective input；
Described leakage current measurement circuit is to described operation processing unit transmitting branch leakage current information, and described operation processing unit carries out the calculating of branch road leakage current and fault detect according to the information received.
The design of leakage current measurement circuit makes this portable communications 240V DC power-supply system insulation monitoring and warning device while carrying out on-the-spot Insulation monitoring, the drain conditions of power supply branch road can also be detected, operation processing unit can carry out the calculating of fault detect according to the drain conditions of branch road, the Insulation monitoring and the fault detect that make this portable communications 240V DC power-supply system insulation monitoring and warning device are more accurate, the most further ensure that the safety of this electric power system.
nullFurther，Described nonequilibrium bridge measuring circuit includes nonequilibrium bridge、Electrical switch and isolated form AD conversion unit，Described nonequilibrium bridge includes the first resistance、Second resistance、3rd resistance、4th resistance、5th resistance and the 6th resistance，Described first resistance one end connects the positive bus-bar of this electric power system，Other end ground connection，Described second resistance one end connects the negative busbar of this electric power system，Other end ground connection，Described 3rd resistance and the 4th resistant series，Described 3rd resistance connects the positive bus-bar of this electric power system，Described 4th resistance eutral grounding，Described 5th resistance and the 6th resistant series，Described 6th resistance connects the negative busbar of this electric power system，Described 5th resistance eutral grounding，7th resistance and the 8th resistant series，Described 7th resistance connects the positive bus-bar of this electric power system，Described 8th resistance connects the negative busbar of this electric power system；
Described electrical switch has two, and is respectively arranged between the positive bus-bar of this electric power system and the first resistance, between the negative busbar of this electric power system and the second resistance；
Described isolated form AD conversion unit first input end is connected to described 7th resistance and the junction point of the 8th resistance, described isolated form AD conversion unit the second input is connected to described 5th resistance and the junction point of the 6th resistance, and described isolated form AD conversion unit outfan connects the input of described operation processing unit.
This electrical switch is controlled switch, the disconnection of electrical switch and Guan Bi, and different resistance accesses the positive bus-bar of this electric power system, negative busbar or greatly so that access unbalanced resistance between the positive bus-bar of this electric power system and the earth, negative busbar and the earth.
Busbar voltage can be reflected on the 8th resistance, is converted into digital quantity by isolated form AD conversion unit, sends into operation processing unit.Voltage between negative busbar and ground can be reflected on the 6th resistance, is converted into digital quantity by isolated form AD conversion unit, sends into operation processing unit.
The voltage of isolated form AD conversion unit first input end and the second input end measuring obtains busbar voltage and negative busbar voltage-to-ground, it is simple to operation processing unit calculates to exist between positive bus-bar and the earth and there is insulation resistance between insulation resistance and negative busbar and the earth.
Further, described operation processing unit outfan is also associated with auxiliary power module and communication module, described auxiliary power module provides accessory power supply, described communication module and described operation processing unit to use RS-485 or CAN interface to send the computed information of this monitoring device to peripheral control unit for described operation processing unit.
Auxiliary power module ensure that the properly functioning of this portable communications 240V DC power-supply system insulation monitoring and warning device, and communication module strengthens the communication of this portable communications 240V DC power-supply system insulation monitoring and warning device and peripheral control unit.
Further, described operation processing unit is single-chip microcomputer, DSP or arm processor, has been used for the calculating of each parameter, the analysis of insulation resistance, data show, data store and the data communication process etc. of peripheral control unit.
Preferably, described leakage current sensor has two, lays respectively in two power supply branch roads of this electric power system, and this makes this portable communications 240V DC power-supply system insulation monitoring and warning device be easy to carry, and preferably embodies portable feature.
Further, described man-machine interaction unit includes parameter setting module and display module, described parameter setting module arranges parameter by man-machine interface to described operation processing unit, and described operation processing unit sends result of calculation by man-machine interface to display module, and shown by display module.This make between this portable communications 240V DC power-supply system insulation monitoring and warning device and user preferably to carry out information mutual.
The beneficial effects of the utility model are: this portable communications 240V DC power-supply system insulation monitoring and warning device simple in construction, production cost is low, it is easy to carry, there is certainty of measurement height, execute-in-place convenience, trouble shooting advantage easily, meet application requirement at the communication aspects such as the installation and debugging of 240V DC power-supply system, performance detection, trouble shoot, there is good market prospect.
Additional aspect of the present utility model and advantage will part be given in the following description, and part will become apparent from the description below, or is recognized by practice of the present utility model.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present utility model and advantage will be apparent from easy to understand, wherein from combining the accompanying drawings below description to embodiment:
Fig. 1 is structure principle chart of the present utility model；
Fig. 2 is non-equilibrium bridge measuring circuit figure.
Detailed description of the invention
Of the present utility model embodiment is described below in detail, and the example of described embodiment is shown in the drawings, and the most same or similar label represents same or similar element or has the element of same or like function.The embodiment described below with reference to accompanying drawing is exemplary, is only used for explaining this utility model, and it is not intended that to restriction of the present utility model.
In description of the present utility model, unless otherwise prescribed and limit, it should be noted that term " is installed ", " being connected ", " connection " should be interpreted broadly, such as, can be to be mechanically connected or electrical connection, can also be the connection of two element internals, can be to be joined directly together, it is also possible to be indirectly connected to by intermediary, for the ordinary skill in the art, the concrete meaning of above-mentioned term can be understood as the case may be.
nullAs shown in Figure 1，This utility model provides a kind of portable communications 240V DC power-supply system insulation monitoring and warning device，Including operation processing unit、Non-equilibrium bridge measuring circuit、Leakage current measurement circuit、Man-machine interaction unit、Auxiliary power module and communication module，Described non-equilibrium bridge measuring circuit current input terminal connects the positive bus-bar of 240V DC power-supply system，Its current output terminal connects the negative busbar of this electric power system，Its earth terminal ground connection，The input of described leakage current measurement circuit connects at least one leakage current sensor，Described leakage current sensor is positioned in the power supply branch road of this electric power system，Described leakage current sensor sends the branch road leakage current situation of power supply branch road in real time to leakage current measurement circuit，Described non-equilibrium bridge measuring circuit signal output part、Leakage current measurement circuit signal outfan connects the input of described operation processing unit，Described operation processing unit outfan connects described man-machine interaction unit respectively、Auxiliary power module and communication module，Described man-machine interaction unit includes parameter setting module and display module.
Described parameter setting module arranges parameter by man-machine interface to described operation processing unit, can be push-button unit, and button is touch key.Described operation processing unit sends result of calculation by man-machine interface to display module, and is shown by display module, and display module can be numeral method device, liquid crystal display etc..Described auxiliary power module provides accessory power supply, described communication module and described operation processing unit to use RS-485 or CAN interface to send the computed information of this monitoring device to peripheral control unit for described operation processing unit.
nullDescribed nonequilibrium bridge measuring circuit includes nonequilibrium bridge、Electrical switch and isolated form AD conversion unit，Described nonequilibrium bridge includes the first resistance R1、Second resistance R2、3rd resistance R3、4th resistance R4、5th resistance R5 and the 6th resistance R6，Described first resistance R1 one end connects the positive bus-bar of this electric power system，Other end ground connection，Described second resistance R2 one end connects the negative busbar of this electric power system，Other end ground connection，Described 3rd resistance R3 and the 4th resistance R4 series connection，Described 3rd resistance R3 connects the positive bus-bar of this electric power system，Described 4th resistance R4 ground connection，Described 5th resistance R5 and the 6th resistance R6 series connection，Described 6th resistance R6 connects the negative busbar of this electric power system，Described 5th resistance R5 ground connection，7th resistance R7 and the 8th resistance R8 series connection，Described 7th resistance R7 connects the positive bus-bar of this electric power system，Described 8th resistance R8 connects the negative busbar of this electric power system.
Described electrical switch has two, it is respectively the first electrical switch K1 and the second electrical switch K2, first electrical switch K1 is arranged between the positive bus-bar of this electric power system and the first resistance R1, and the second electrical switch K2 is arranged between the negative busbar of this electric power system and the second resistance R2.
Described isolated form AD conversion unit first input end is connected to described 7th resistance R7 and the junction point of the 8th resistance R8, described isolated form AD conversion unit the second input is connected to described 5th resistance R5 and the junction point of the 6th resistance R6, and described isolated form AD conversion unit outfan connects the input of described operation processing unit.
Described non-equilibrium bridge measuring circuit and leakage current measurement circuit send the most measured information to described operation processing unit, and described operation processing unit carries out insulation resistance, branch road leakage current and the calculating of fault detect according to the information received.
First electrical switch K1 and the disconnection of the second electrical switch K2 and Guan Bi, different resistance is accessed the positive bus-bar of this electric power system, negative busbar or greatly, make to access unbalanced resistance between the positive bus-bar of this electric power system and the earth, negative busbar and the earth, thus busbar voltage Ub under recording different situations and negative busbar are to big ground voltage Um, then carried out being calculated by operation processing unit and there is insulation resistance between positive bus-bar and the earth, between negative busbar and the earth, there is insulation resistance.
Leakage current sensor Real-time Collection branch road leakage current situation, and it is sent to leakage current measurement circuit, the branch road leakage current information received is filtered processing and analog-to-digital conversion process by leakage current circuit, and the leakage current being then forwarded in operation processing unit carry out branch road calculates.Here leakage current sensor is opening cassette leakage current sensor, it is convenient to snap in branch road circuit.Operation processing unit is single-chip microcomputer, DSP or arm processor.Calculating involved in the present embodiment all uses existing known algorithmic methods.
The present embodiment is from the communication installation and debugging of 240V DC power-supply system, performance detection, the demand of trouble shoot, use nonequilibrium bridge and the method for comprehensive detection of leakage current, the i.e. major loop insulation resistance of unbalanced bridge detection straight-flow system, branch road detection leakage current, the trouble point that comprehensive descision insulation reduces.
Preferred version as the present embodiment, leakage current sensor has two, it is respectively the first leakage current sensor S1 and the second leakage current sensor S2, lay respectively in two power supply branch roads of this electric power system, only two power supply branch roads of design, two leakage current sensors, embody convenience of the present utility model further.
In the description of this specification, the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means that the specific features, structure, material or the feature that combine this embodiment or example description are contained at least one embodiment of the present utility model or example.In this manual, the schematic representation to above-mentioned term is not necessarily referring to identical embodiment or example.And, the specific features of description, structure, material or feature can combine in any one or more embodiments or example in an appropriate manner.
Embodiment the most of the present utility model, it will be understood by those skilled in the art that: these embodiments can carry out in the case of without departing from principle of the present utility model and objective multiple change, revise, replace and modification, scope of the present utility model is limited by claim and equivalent thereof.
Claims (7)
1. a portable communications 240V DC power-supply system insulation monitoring and warning device, it is characterised in that
Including operation processing unit, non-equilibrium bridge measuring circuit and man-machine interaction unit, electricity measured by described non-equilibrium bridge
Road current input terminal connects the positive bus-bar of 240V DC power-supply system, and its current output terminal connects this power supply system
The negative busbar of system, described non-equilibrium bridge measuring circuit signal output part connects the input of described operation processing unit
End, described operation processing unit outfan connects described man-machine interaction unit；
Described non-equilibrium bridge measuring circuit sends its measured information, described fortune to described operation processing unit
Calculate processing unit and carry out the calculating of insulation resistance and fault detect according to the information received.
Portable communications 240V DC power-supply system insulating monitoring the most according to claim 1 fills
Putting, it is characterised in that also include leakage current measurement circuit, the input of described leakage current measurement circuit connects
At least one leakage current sensor, described leakage current sensor is had to be positioned in the power supply branch road of this electric power system,
Described leakage current sensor sends the branch road leakage current situation of power supply branch road, institute in real time to leakage current measurement circuit
State leakage current measurement circuit signal outfan and connect described operation processing unit respective input；
Described leakage current measurement circuit is to described operation processing unit transmitting branch leakage current information, described computing
Processing unit carries out the calculating of branch road leakage current and fault detect according to the information received.
Portable communications 240V DC power-supply system insulating monitoring the most according to claim 1 fills
Put, it is characterised in that described nonequilibrium bridge measuring circuit includes nonequilibrium bridge, electrical switch and isolation
Type AD conversion unit, described nonequilibrium bridge include the first resistance (R1), the second resistance (R2),
Three resistance (R3), the 4th resistance (R4), the 5th resistance (R5) and the 6th resistance (R6), described
One resistance (R1) one end connects the positive bus-bar of this electric power system, other end ground connection, described second resistance (R2)
One end connects the negative busbar of this electric power system, other end ground connection, described 3rd resistance (R3) and the 4th electricity
Resistance (R4) series connection, described 3rd resistance (R3) connects the positive bus-bar of this electric power system, described 4th electricity
Resistance (R4) ground connection, described 5th resistance (R5) and the series connection of the 6th resistance (R6), described 6th resistance
(R6) negative busbar of this electric power system, described 5th resistance (R5) ground connection, the 7th resistance (R7) are connected
With the 8th resistance (R8) series connection, described 7th resistance (R7) connects the positive bus-bar of this electric power system, institute
State the 8th resistance (R8) and connect the negative busbar of this electric power system；
Described electrical switch has two, and is respectively arranged at positive bus-bar and first resistance (R1) of this electric power system
Between, between the negative busbar of this electric power system and the second resistance (R2)；
Described isolated form AD conversion unit first input end is connected to described 7th resistance (R7) and the 8th electricity
The junction point of resistance (R8), described isolated form AD conversion unit the second input is connected to described 5th electricity
Resistance (R5) and the junction point of the 6th resistance (R6), described isolated form AD conversion unit outfan connects
The input of described operation processing unit.
Portable communications 240V DC power-supply system insulating monitoring the most according to claim 1 fills
Put, it is characterised in that described operation processing unit outfan is also associated with auxiliary power module and communication module,
Described auxiliary power module provides accessory power supply, described communication module and described fortune for described operation processing unit
Outside calculation processing unit uses RS-485 or CAN interface to be sent to by the computed information of this monitoring device
Portion's controller.
Portable communications 240V DC power-supply system insulating monitoring the most according to claim 1 fills
Put, it is characterised in that described operation processing unit is single-chip microcomputer, DSP or arm processor.
Portable communications 240V DC power-supply system insulating monitoring the most according to claim 2 fills
Put, it is characterised in that described leakage current sensor has two, lay respectively at two power supplies of this electric power system
In branch road.
Portable communications 240V DC power-supply system insulating monitoring the most according to claim 1 fills
Put, it is characterised in that described man-machine interaction unit includes parameter setting module and display module, described parameter
Arranging module and arrange parameter by man-machine interface to described operation processing unit, described operation processing unit is passed through
Man-machine interface sends result of calculation to display module, and is shown by display module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620031969.XU CN205484555U (en) | 2016-01-13 | 2016-01-13 | Portable 240V direct current system insulation monitoring and warning device for communication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620031969.XU CN205484555U (en) | 2016-01-13 | 2016-01-13 | Portable 240V direct current system insulation monitoring and warning device for communication |
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| Publication Number | Publication Date |
|---|---|
| CN205484555U true CN205484555U (en) | 2016-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620031969.XU Expired - Fee Related CN205484555U (en) | 2016-01-13 | 2016-01-13 | Portable 240V direct current system insulation monitoring and warning device for communication |
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| CN (1) | CN205484555U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107607839A (en) * | 2017-09-08 | 2018-01-19 | 国网山东省电力公司淄博供电公司 | Single armed unbalanced bridge insulation monitoring and warning device |
| CN113567743A (en) * | 2021-07-16 | 2021-10-29 | 东风汽车集团股份有限公司 | Detection system and method for electric vehicle power converter |
| CN113589040A (en) * | 2021-06-08 | 2021-11-02 | 重庆市公安局 | Operation algorithm of 240V direct current power supply system insulation monitoring device |
-
2016
- 2016-01-13 CN CN201620031969.XU patent/CN205484555U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107607839A (en) * | 2017-09-08 | 2018-01-19 | 国网山东省电力公司淄博供电公司 | Single armed unbalanced bridge insulation monitoring and warning device |
| CN113589040A (en) * | 2021-06-08 | 2021-11-02 | 重庆市公安局 | Operation algorithm of 240V direct current power supply system insulation monitoring device |
| CN113567743A (en) * | 2021-07-16 | 2021-10-29 | 东风汽车集团股份有限公司 | Detection system and method for electric vehicle power converter |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160817 Termination date: 20180113 |