CN207410018U - A kind of alternating current-direct current for direct-flow distribution system is being got lines crossed default detection and protection device - Google Patents
A kind of alternating current-direct current for direct-flow distribution system is being got lines crossed default detection and protection device Download PDFInfo
- Publication number
- CN207410018U CN207410018U CN201721406462.9U CN201721406462U CN207410018U CN 207410018 U CN207410018 U CN 207410018U CN 201721406462 U CN201721406462 U CN 201721406462U CN 207410018 U CN207410018 U CN 207410018U
- Authority
- CN
- China
- Prior art keywords
- direct current
- double tube
- direct
- converters
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Emergency Protection Circuit Devices (AREA)
- Direct Current Feeding And Distribution (AREA)
- Rectifiers (AREA)
Abstract
Get lines crossed default detection and protection device the utility model discloses a kind of alternating current-direct current for direct-flow distribution system, the input terminal connection DC power supply of protective device, output terminal connection DC load；It includes double tube positive exciting DC/DC converters, single chip machine controlling circuit, output diode and detection circuit；The input terminal connection DC power supply of double tube positive exciting DC/DC converters, the output terminal of double tube positive exciting DC/DC converters connect DC load by output diode；Single chip machine controlling circuit connects the driving end of double tube positive exciting DC/DC converters；Detection circuit includes direct current positive bus AC signal sample circuit and direct current negative busbar AC signal sample circuit, the output diode of the sampling end connection double tube positive exciting DC/DC converter output voltage side of the positive electrode of direct current positive bus AC signal sample circuit, the output diode of the sampling end connection double tube positive exciting DC/DC converter output voltage negative sides of direct current negative busbar AC signal sample circuit, are being scurried into direct current just by the exchange on the output voltage positive and negative busbar collected for detection circuit and/or negative voltage signal is transferred to single chip machine controlling circuit.
Description
Technical field
Get lines crossed default detection and protection device the utility model is related to a kind of alternating current-direct current for direct-flow distribution system, belong to
Alternating current-direct current is being got lines crossed fault detection technique field in direct-flow distribution system.
Background technology
Straight-flow system, which is commonly applied to all kinds of substations and firepower, hydraulic power plant etc., to be needed to use the ground of DC equipment
Side is the important component of electric power secondary system, is the basis of electric power system control and protection, while is also to ensure that accident energy
The guarantee quickly handled.In direct-flow distribution system, ac circuit and DC loop are two mutually independent systems, are handed over
It is usually earthed system to flow back to road, and DC loop is floating ground, since live artificial maloperation or rainwater enter distribution box, can be made
The positive or negative busbar of firewire or zero curve and straight-flow system into exchange is connecting, that is, alternating current-direct current occurs and gets lines crossed failure.
When generation alternating current-direct current is getting lines crossed failure, DC system grounding is will result in, if ground connection is happened at direct-flow positive pole, just
It can cause protection that the possibility of malfunction occurs；If protection is happened at direct current cathode, the possibility that tripping occurs for protection will result in；Separately
Outside, combined-voltage is superimposed on the intermediate relay both ends of direct current trip(ping) circuit, amplitude far more than intermediate relay action
Voltage, therefore just it is present with the action of periodic relay flutter or Phototube Coupling signal.
Straight-flow system generation earth fault can caused by being got lines crossed due to alternating current-direct current, therefore what existing straight-flow system alternating current-direct current was being got lines crossed
Solution method can search earth fault by portable grounding fault searching instrument, but since the compatibility for searching instrument is low
With the factor of poor anti jamming capability, the wrong report of earth fault can be caused, and for any conducting wire on access dc bus all
It searches, quantities is big, poor in timeliness, and alternating current-direct current failure of getting lines crossed is being difficult to differentiate and accurately searches；Alternatively, it is also possible to be tried with short circuit
Line is tested to identify alternating current and direct current, analysis alternating current-direct current is being got lines crossed, but can not avoid the mistake touched by mistake；In addition, these instruments or
The i.e. enabled alternating current-direct current that finds of method is being got lines crossed failure, but can not be limited and isolated fault, phenomenon of the failure can be further expanded to
Entire direct-flow distribution system influences the normal operation of system.
Utility model content
Purpose of utility model：The technical problem to be solved by the utility model is to provide a kind of for direct-flow distribution system
Alternating current-direct current is being got lines crossed default detection and protection device, which can not only accurately detect the alternating current-direct current string on dc bus
Line failure, and Fault Isolation can also corresponded to DC load branch, it will not be to other DC load branches or DC power supply
Bus bar side impacts.
In order to solve the above technical problems, technical solution is used by the utility model：
A kind of alternating current-direct current for direct-flow distribution system is being got lines crossed default detection and protection device, the input of the protective device
End connection DC power supply, output terminal connection DC load；It includes double tube positive exciting DC/DC converters, single chip machine controlling circuit, defeated
Go out diode and detection circuit；The input terminal connection DC power supply of the double tube positive exciting DC/DC converters, double tube positive exciting DC/
The output terminal of DC converters connects DC load by output diode；The single chip machine controlling circuit connection double tube positive exciting DC/
The driving end of DC converters；The detection circuit exchanges letter including direct current positive bus AC signal sample circuit with direct current negative busbar
Number sample circuit, the sampling end connection double tube positive exciting DC/DC converter output voltages of direct current positive bus AC signal sample circuit
The output diode of side of the positive electrode, the sampling end connection double tube positive exciting DC/DC converters of direct current negative busbar AC signal sample circuit
The output diode of output voltage negative side, the detection circuit scurry into the exchange on the output voltage positive and negative busbar collected
Direct current is just and/or negative voltage signal is transferred to single chip machine controlling circuit.
Further preferably, the protective device multiple can be arranged in parallel, the input terminal of the protective device of multiple parallel connections with
DC power supply connects, and the output terminal of the protective device of multiple parallel connections connects different direct currents by respective output diode respectively
Load branch.
Further preferably, RS-485 communication interfaces and human-computer interaction interface, RS-485 communication interfaces and man-machine friendship are further included
Mutual interface is connected respectively with single chip machine controlling circuit.
Further preferably, the DC power supply is accumulator group, and the accumulator group is electric by the lead carbon of 18 section 12V, 100Ah
Pond is composed in series.
Further preferably, there is high-frequency isolation transformer in the double tube positive exciting DC/DC converters；Double tube positive exciting DC/DC becomes
The model FQA28N50 of metal-oxide-semiconductor in parallel operation.
Further preferably, in the single chip machine controlling circuit dsPIC singlechip model dsPIC30F2023, including hand over
Flee into direct current positive bus voltage sampling port AN3, exchange scurry into direct current negative busbar voltage sampling port AN4, for control it is two-tube just
Swash PWM1, PWM2 signal output port of DC/DC two metal-oxide-semiconductors of converter and AD sample ports AN0, AN1 and AN2, AN0,
AN1, AN2 gather the input voltage, output voltage and output current of double tube positive exciting DC/DC converters respectively.
Compared with the prior art, technical solutions of the utility model have the advantage that for：
The utility model is getting lines crossed default detection and protection device for the alternating current-direct current of direct-flow distribution system can not only be accurate
Detect that the alternating current-direct current on dc bus is being got lines crossed failure, moreover it is possible to be alarmed in time failure and fault message is carried out
It passes；And the alternating current that can also prevent to scurry into DC load branch to dc bus side and other DC load branches from uploading
It broadcasts, Fault Isolation can corresponded to DC load branch, other DC load branches or DC power supply bus bar side will not made
Into influence, it is achieved thereby that the isolation of failure.
Description of the drawings
Fig. 1 be the utility model for the alternating current-direct current of direct-flow distribution system get lines crossed default detection and protection device system it is former
Reason figure；
Fig. 2 be the utility model for the alternating current-direct current of direct-flow distribution system get lines crossed in default detection and protection device it is two-tube just
Swash the circuit diagram of DC/DC converters；
Fig. 3 is the utility model to get lines crossed microcontroller in default detection and protection device for the alternating current-direct current of direct-flow distribution system
The circuit diagram of control circuit；
Fig. 4 is that the utility model is getting lines crossed for the alternating current-direct current of direct-flow distribution system electricity is detected in default detection and protection device
The circuit diagram on road；
Fig. 5 is that multiple alternating current-direct currents are being got lines crossed the structure principle chart of default detection and protection device parallel connection；
Fig. 6 is the microcontroller control flow chart of the utility model device.
Specific embodiment
Technical solutions of the utility model are described further below in conjunction with attached drawing.
As shown in Figure 1, the utility model is being got lines crossed default detection and protection device for the alternating current-direct current of direct-flow distribution system, it should
The input terminal connection DC power supply (accumulator group) of protective device, output terminal connection DC load；It includes double tube positive exciting DC/DC
Converter, single chip machine controlling circuit, output diode and detection circuit；The input terminal connection of double tube positive exciting DC/DC converters
DC power supply, the output terminal of double tube positive exciting DC/DC converters connect DC load by output diode；Single chip machine controlling circuit
Connect the driving end of double tube positive exciting DC/DC converters；Detection circuit includes direct current positive bus AC signal sample circuit and direct current
Negative busbar AC signal sample circuit, the sampling input terminal of direct current positive bus AC signal sample circuit are connected by output diode
The output voltage anode of double tube positive exciting DC/DC converters is connect, the sampling input terminal of direct current negative busbar AC signal sample circuit leads to
Cross the output voltage cathode of output diode connection double tube positive exciting DC/DC converters, the double tube positive exciting that detection circuit will collect
The output voltage anode exchange of DC/DC converters scurries into direct current positive/negative voltage signal and is transferred to single chip machine controlling circuit；This practicality
The new alternating current-direct current for direct-flow distribution system default detection and protection device of getting lines crossed is further including RS-485 communication interfaces and man-machine
Interactive interface, RS-485 communication interfaces and human-computer interaction interface are connected respectively with single chip machine controlling circuit, RS-485 communication interfaces
Also it is connected with external touch-screen；When there is alternating voltage to scurry into direct current positive and negative busbar, scurried by detection circuit detection exchange
Direct current positive and negative busbar voltage is sent to single chip machine controlling circuit and carries out data processing, on the one hand single chip machine controlling circuit is led to by SPI
Communication interface is being sent to display screen (human-computer interaction interface) and is being shown, provides alternating current-direct current and gets lines crossed alarm signal, is shown on the spot；One
Aspect can also carry out the long-distance Log server of fault message by RS-485 communication interfaces, realize remote monitoring；Microcontroller control simultaneously
Circuit controls the work shape of two metal-oxide-semiconductors of double tube positive exciting DC/DC converters by two driving control signal of PWM1, PWM2
State, so as to fulfill the isolation for failure of getting lines crossed to alternating current-direct current.
Wherein, accumulator group is composed in series by the lead carbon battery of 18 section 12V, 100Ah.The utility model is used for DC distribution
The alternating current-direct current of system is getting lines crossed default detection and protection device using digital PID control, is realized by single chip machine controlling circuit
The get lines crossed detection of failure, alarm and information of control and alternating current-direct current to double tube positive exciting DC/DC converters is uploading.
As shown in Fig. 2, double tube positive exciting DC/DC converters use single chip machine controlling circuit, as its controller, Uin is input
Voltage, Uo are output voltage, and L is inductance, and T is high-frequency isolation transformer, and C1, C2 are filter capacitor, and power tube Q1, Q2 are selected
Metal-oxide-semiconductor, the model FQA28N50 of metal-oxide-semiconductor；PWM1, PWM2 provide 2 complementary drive controls by single chip machine controlling circuit to be believed
Number, D1, D2 are fly-wheel diode, select the diode recovered soon, and rectifier diode D3, D4 select fast recovery diode.
Referring to Fig. 3, single chip machine controlling circuit schematic diagram, the model of dsPIC singlechip in single chip machine controlling circuit
DsPIC30F2023, Ui are input voltage, and Uo samples for output voltage, and Io is output current, and CT0, CT represent current transformer,
Y represents crystal oscillator, and C1, C2 are crystal oscillator capacitance, and R1, R2, R3, R4 are voltage sample resistance, and T1 and T2 are temperature sampling port, AN3,
AN4 scurries into direct current positive and negative busbar voltage sample port for exchange, and exchange of the sampled input voltage in Fig. 4 is scurrying into direct current just
Negative sampled voltage, PWM1, PWM2 signal of microcontroller are used for controlling two metal-oxide-semiconductors of double tube positive exciting DC/DC converters, microcontroller
AD sample ports AN0, AN1, AN2 gather the input voltage, output voltage and output of double tube positive exciting DC/DC converters respectively
Electric current；485A the and 485B ports of microcontroller are RS-485 communication interfaces, microcontroller by its SPI communication interface (SDI,
SCK, SDO) it is communicated with human-computer interaction interface realization.
Referring to Fig. 4, alternating current-direct current is being got lines crossed detection circuit schematic diagram, and the power supply of direct current 220V is double tube positive exciting DC/DC converters
Output voltage, install an output diode (isolating diode) additional respectively on output voltage positive and negative busbar, this output two poles
Pipe is the output diode in Fig. 1, and output diode selects common rectifier diode；Detection circuit detection is exactly two-tube
Whether alternating current is sealed on normal shock DC/DC converter output voltage positive and negative busbars, when there is alternating current to seal in, be equivalent to alternating current
Source is in parallel with DC power supply；C1, R1 are direct current positive bus AC signal sampling capacitance resistance, and C2, R2 exchange for direct current negative busbar
Signal sampling capacitance resistance, R3, R4, R5, R6 are respectively current-limiting resistance；Tr1 and Tr2 is voltage transformer, for Sample AC
Voltage；AC220V is for analog AC ingress signal；AC sampling voltage passes through voltage lifting circuit (+2.5V), positive and negative limit
Volt circuit (D3, D4, D5 and D6), amplifier amplification and filter circuit (U1A, R7, C5 and U1B, R9, C6), one-chip machine port are protected
Circuit (D7 and D8) finally realizes the sampling for exchanging and scurrying into direct current generating positive and negative voltage, and exchange is scurried into direct current generating positive and negative voltage by detection circuit
Signal is sent to AN3 and AN4 ports in Fig. 3.
Fig. 6 understands, the utility model is being got lines crossed the work of default detection and protection device for the alternating current-direct current of direct-flow distribution system
Make process：The utility model protective device is series at DC power supply (accumulator group) between DC load, in each module and respectively
After parameter initialization, protective device starts；After the completion of starting, single chip machine controlling circuit is gathered by the AD sampling units of itself
Double tube positive exciting DC/DC converters input current, output voltage and output current exchange and scurry into the positive or negative voltage of direct current, carry out phase
Logic, data processing and the data operation of pass；When there is alternating voltage to scurry into direct current positive bus, detected and exchanged by detection circuit
Direct current positive bus voltage is scurried into, microcontroller is sent to and carries out data processing, the AD values of microcontroller sampling subtract DC offset voltage
The instantaneous value for the AC sine wave that (the corresponding AD values of 2.5V DC offset voltages) is scurried into, alternating voltage a cycle when
Between be 20ms, a cycle microcontroller samples 100 points, the data in 3 cycles of continuous sampling, and carrying out exchange, to scurry into voltage effective
The calculating of value, this data are being sent to display screen and are shown by SPI communications, while provide alternating current-direct current and get lines crossed alarm signal, carry out
It shows on the spot；The long-distance Log server for carrying out fault message can also be communicated by RS485, realizes remote monitoring.
As shown in figure 5, the utility model protective device multiple can be arranged in parallel, the input terminal of the protective device of multiple parallel connections
It is connected with DC power supply, the output terminal of the device of multiple parallel connections is correspondingly connected with different direct currents by output diode respectively and bears
Branch is carried, since double tube positive exciting DC/DC converters have high-frequency isolation transformer in protective device, alternating current-direct current is being got lines crossed failure
Bus of storage battery side is not transferred to, other DC load branches will not be transferred to, failure is finally limited in this branch,
Realize alternating current-direct current get lines crossed failure quick positioning and accurate route selection.
Claims (6)
- The default detection and protection device 1. a kind of alternating current-direct current for direct-flow distribution system is being got lines crossed, it is characterised in that：The protection The input terminal connection DC power supply of device, output terminal connection DC load；It includes double tube positive exciting DC/DC converters, microcontroller Control circuit, output diode and detection circuit；The input terminal connection DC power supply of the double tube positive exciting DC/DC converters, The output terminal of double tube positive exciting DC/DC converters connects DC load by output diode；The single chip machine controlling circuit connection The driving end of double tube positive exciting DC/DC converters；The detection circuit includes direct current positive bus AC signal sample circuit and direct current Negative busbar AC signal sample circuit, the sampling end connection double tube positive exciting DC/DC of direct current positive bus AC signal sample circuit become The output diode of parallel operation output voltage side of the positive electrode, the sampling end connection double tube positive exciting of direct current negative busbar AC signal sample circuit The output diode of DC/DC converter output voltage negative sides, the output voltage positive and negative busbar that the detection circuit will collect On exchange scurrying into direct current just and/or negative voltage signal is transferred to single chip machine controlling circuit.
- The default detection and protection device 2. the alternating current-direct current according to claim 1 for direct-flow distribution system is being got lines crossed, it is special Sign is：The protective device multiple can be arranged in parallel, and the input terminal of the protective device of multiple parallel connections is connected with DC power supply, The output terminal of the protective device of multiple parallel connections connects different DC load branches by respective output diode respectively.
- The default detection and protection device 3. the alternating current-direct current according to claim 1 for direct-flow distribution system is being got lines crossed, it is special Sign is：Further include RS-485 communication interfaces and human-computer interaction interface, RS-485 communication interfaces and human-computer interaction interface respectively with Single chip machine controlling circuit connects.
- The default detection and protection device 4. the alternating current-direct current according to claim 1 or 2 for direct-flow distribution system is being got lines crossed, It is characterized in that：The DC power supply be accumulator group, the accumulator group by 18 section 12V, 100Ah lead carbon battery series connection group Into.
- The default detection and protection device 5. the alternating current-direct current according to claim 1 for direct-flow distribution system is being got lines crossed, it is special Sign is：There is high-frequency isolation transformer in the double tube positive exciting DC/DC converters；Metal-oxide-semiconductor in double tube positive exciting DC/DC converters Model FQA28N50.
- The default detection and protection device 6. the alternating current-direct current according to claim 1 for direct-flow distribution system is being got lines crossed, it is special Sign is：The model dsPIC30F2023 of dsPIC singlechip in the single chip machine controlling circuit is scurrying into direct current just including exchange Direct current negative busbar voltage sampling port AN4 is scurried into busbar voltage thief hatch AN3, exchange, for controlling double tube positive exciting DC/DC converters PWM1, PWM2 signal output port and AD sample ports AN0, AN1 and AN2 of two metal-oxide-semiconductors, AN0, AN1, AN2 are adopted respectively Collect input voltage, output voltage and the output current of double tube positive exciting DC/DC converters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721406462.9U CN207410018U (en) | 2017-10-27 | 2017-10-27 | A kind of alternating current-direct current for direct-flow distribution system is being got lines crossed default detection and protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721406462.9U CN207410018U (en) | 2017-10-27 | 2017-10-27 | A kind of alternating current-direct current for direct-flow distribution system is being got lines crossed default detection and protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207410018U true CN207410018U (en) | 2018-05-25 |
Family
ID=62408875
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721406462.9U Active CN207410018U (en) | 2017-10-27 | 2017-10-27 | A kind of alternating current-direct current for direct-flow distribution system is being got lines crossed default detection and protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207410018U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107666141A (en) * | 2017-10-27 | 2018-02-06 | 辽宁清河发电有限责任公司 | A kind of alternating current-direct current for direct-flow distribution system is being got lines crossed default detection and protection device |
| CN110757467A (en) * | 2019-12-15 | 2020-02-07 | 华南理工大学广州学院 | Control method of multi-degree-of-freedom industrial robot based on single chip microcomputer |
-
2017
- 2017-10-27 CN CN201721406462.9U patent/CN207410018U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107666141A (en) * | 2017-10-27 | 2018-02-06 | 辽宁清河发电有限责任公司 | A kind of alternating current-direct current for direct-flow distribution system is being got lines crossed default detection and protection device |
| CN107666141B (en) * | 2017-10-27 | 2023-12-05 | 辽宁清河发电有限责任公司 | AC/DC series line fault detection and protection device for DC power distribution system |
| CN110757467A (en) * | 2019-12-15 | 2020-02-07 | 华南理工大学广州学院 | Control method of multi-degree-of-freedom industrial robot based on single chip microcomputer |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102207529A (en) | Voltage sampling device and method capable of judging sampling line break of battery pack | |
| CN201730811U (en) | Photovoltaic water pump controller | |
| CN203324380U (en) | Direct-current source system insulation monitoring apparatus and monitoring host thereof | |
| CN207410018U (en) | A kind of alternating current-direct current for direct-flow distribution system is being got lines crossed default detection and protection device | |
| CN107666141A (en) | A kind of alternating current-direct current for direct-flow distribution system is being got lines crossed default detection and protection device | |
| CN204925314U (en) | Distribution network checkout system that fault locating used | |
| CN206773058U (en) | OPGW on-line monitoring systems | |
| CN103260263A (en) | Metro stray current wireless monitoring system and method | |
| CN107703404A (en) | The active earth protective device of straight-flow system and its guard method of use | |
| CN203910935U (en) | Intelligent batteries and monitoring system for intelligent batteries | |
| CN103616616A (en) | Fault detection method for large-scale grounding grid | |
| CN203838236U (en) | Device for detecting electric crossing of direct-current system | |
| CN203587701U (en) | Online detection circuit for photovoltaic inverter ground insulation resistance | |
| CN104701970A (en) | Power supply automatic transfer switch controller | |
| CN202353313U (en) | Monitoring system of power supply equipment for power | |
| CN107490744A (en) | A kind of grounded continuous detection circuit of electric automobile power supply unit | |
| CN106908653A (en) | OPGW on-line monitoring systems and method | |
| CN208087753U (en) | A kind of drain means of buried pipeline | |
| CN102707174A (en) | Detection system and method of operation state of resistor type superconductive current limiter | |
| CN203786228U (en) | RS485 interface inspection apparatus for electric energy meter | |
| CN202957571U (en) | Electric leakage detection circuit for single-phase power supply of isolated neutral system | |
| CN202041612U (en) | Automatic locating device for earth faults of electricity transmission lines | |
| CN205140192U (en) | Terminal of zooming out that power consumption information acquisition GPRS is wireless based on 10kV induction electricity -taking | |
| CN207249036U (en) | The active earth protective device of straight-flow system | |
| CN203883553U (en) | Intelligent type micro-grid gateway |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |