CN105988088B - A kind of method and system that detection DC bus branch is mutually altered - Google Patents
A kind of method and system that detection DC bus branch is mutually altered Download PDFInfo
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- CN105988088B CN105988088B CN201510050574.4A CN201510050574A CN105988088B CN 105988088 B CN105988088 B CN 105988088B CN 201510050574 A CN201510050574 A CN 201510050574A CN 105988088 B CN105988088 B CN 105988088B
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Abstract
The present invention relates to a kind of method and system that detection DC bus branch is mutually altered, method is comprising steps of whether detection DC bus has AC signal, and judges whether there is insulation fault between DC bus and DC bus branch；If DC bus does not have AC signal, and naked failure between DC bus and DC bus branch, then the test bridge of one DC bus of switching, to generate AC signal；Inspection is carried out to another DC bus branch, if another DC bus branch has AC signal, to determine mutually to alter between a DC bus branch and another DC bus branch to judge whether another DC bus branch has AC signal.Detection DC bus branch mutually alters that method is simple, intervenes without operator, realizes detection automation.
Description
Technical field
The present invention relates to the detection fields of electric system, mutually alter more specifically to a kind of detection DC bus branch
Method and system.
Background technique
Emergency power supply and control of the DC power supply of generation current factory, substation and communication high pressure as electric equipments
Signal power source.Direct current system is the important component part of power plant, substation, and the security reliability of direct current system affects power generation
The safe operation of factory, substation is related to the safety in production of entire power grid.As DC current is applied simultaneously in electric power, communication etc.
It is required that the reliability of system, it is desirable that two sections of independent direct current current systems are simultaneously deposited, equipment extra high for power reguirements, using double
Power supply power supply.
Under double power-supply system, due to factors such as equipment fault, manual operations, it be easy to cause two sections of direct current systems to occur non-
It is expected mutually to alter.Two sections of bus interconnected loops to system maintenance, apparatus maintenance, are disconnected and being protected there is very big harm,
The monitoring that microcomputer insulating monitor can be interfered simultaneously causes to judge phenomena such as being grounded by accident, and the personal safety for service personnel is even more
Great hidden danger.Simultaneously because branch network is complicated, locking equipment is various, and branch is mutually altered with extremely strong concealment, searches and mutually alters
Branch has comparable difficulty.
Summary of the invention
The technical problem to be solved in the present invention is that in view of the above drawbacks of the prior art, it is female to provide a kind of detection direct current
The method and system that line branch is mutually altered, can be convenient, which whether there is between the branch for quickly judging DC bus, mutually alters.
The technical solution adopted by the present invention to solve the technical problems is: constructing a kind of detection DC bus branch and mutually alters
Method includes the following steps:
A. detect DC bus on whether have AC signal, and judge be between the DC bus and DC bus branch
It is no to have insulation fault；
If B. without AC signal on the DC bus, and without absolutely between the DC bus and the DC bus branch
Reason hinders, then the test bridge between one DC bus of switching and ground line, to generate AC signal；
C. inspection is carried out to another DC bus branch, and judges whether another DC bus branch has AC signal, if
Have, then determines mutually to alter between the DC bus branch and another DC bus branch.
Preferably, in the step A, judge whether there is insulation fault tool between the DC bus and DC bus branch
Body includes the following steps:
Acquire the current signal of the DC bus；
Acquire the current signal of the DC bus branch；
Judge whether the current signal of the DC bus is identical as the current signal of the DC bus branch, if described
The current signal of DC bus is identical as the current signal of the DC bus branch, then judges the DC bus and described straight
Flow naked failure between bus branch.
The present invention also provides a kind of systems that detection DC bus branch is mutually altered, including microcomputer insulation tester, control mould
Block, relay, current detecting instrument, first switch K1, second switch K2, the first test resistor bridge Rp1, the second test resistor bridge
Rp2, the first balance resistor bridge Rb1, the second balance resistor bridge Rb2, ground line, the control module are connect with the relay,
The first switch K1 and the first test resistor bridge Rp1 are series in DC bus between positive bus-bar and the ground line,
The second switch K2 and the second test resistor bridge Rp2 are series at negative busbar and the ground line in the DC bus
Between, the first balance resistor bridge Rb1 is connected between the positive bus-bar and the ground line, the second balance resistor bridge
Rb2 is connected between the negative busbar and the ground line；
The current detecting instrument is connect, for acquiring the electric current in DC bus branch with the microcomputer insulation tester
Signal is simultaneously exported to the microcomputer insulation tester；
The microcomputer insulation tester, connect with the DC bus, including AC signal judgment module and insulation fault
Judgment module,
The AC signal judgment module, the electric current for receiving the DC bus and the DC bus branch are believed
Number, and AC signal is judged whether there is,
The insulation fault judgment module, the electric current for receiving the DC bus and the DC bus branch are believed
Number, and judge whether the direct current signal of the current bus bar is identical as the current signal of the DC bus branch, if they are the same, then
Judge naked failure between the DC bus and the DC bus branch；
The control module, for sending control instruction to the relay, to control described in the relay switching
The one switch K1 or second switch K2；
The relay, for the first switch K1 or second switch K2 described in switching, to be in series with described first
AC signal is generated on the DC bus of switch K1 or the second switch K2.
Preferably, the current detecting instrument includes that direct current signal detector, alternating current signal detection instrument, single-chip microcontroller, third are opened
It closes and the 4th switch, the direct current signal detector and the alternating current signal detection instrument is connected in parallel on the single-chip microcontroller, described the
Three switches connect between the direct current signal detector and the single-chip microcontroller, and the 4th switch connects in the alternating current signal detection
Between instrument and the single-chip microcontroller, the single-chip microcontroller is used to control the connecting and disconnecting of the third switch and the 4th switch,
And the current signal that the direct current signal detector or the alternating current signal detection instrument acquire is exported exhausted to the microcomputer
Edge detector.
Preferably, the precision of the direct current signal detector is greater than or equal to ± 0.1mA, the alternating current signal detection instrument
Precision is greater than or equal to ± 0.05mA.
Implement the method and system that detection DC bus branch of the invention is mutually altered, first determines whether have on DC bus
Whether there is insulation fault between AC signal and DC bus and DC bus branch, and then excludes to influence the interference of result
Factor, then by the test bridge between one DC bus of switching and ground line to generate AC signal, then judge that another direct current is female
Whether line branch road has AC signal, if judgement has, proves that the branch between a DC bus and another DC bus is mutually altered,
The judgment method is simple and convenient, intervenes without operator, realizes detection automation.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing:
Fig. 1 is the system structure diagram that detection DC bus branch of the invention is mutually altered；
Fig. 2 is the structural schematic diagram of current signal detector of the invention；
Fig. 3 is the method flow diagram that detection DC bus branch of the invention is mutually altered.
Specific embodiment
As shown in Figure 1, in the first embodiment for the system that detection DC bus branch of the invention is mutually altered, including microcomputer
Insulation tester 1, control module 2, relay 3, current detecting instrument 4, first switch K1, second switch K2, the first test bridge electricity
Rp1, the second test resistor bridge Rp2, ground line are hindered, DC bus includes positive bus-bar and negative busbar.First test resistor bridge Rp1 and
First switch K1 is connected between positive bus-bar and ground line, and the second test resistor bridge Rp2 and second switch K2 is connected on positive bus-bar
Between ground line.The system that detection DC bus branch is mutually altered further includes the first balance resistor bridge Rb1, the second balance resistor bridge
Rb2, first balance resistor bridge Rb1 is connected on positive bus-bar and ground line between, second balance resistor bridge Rb2 be connected on negative busbar with
Between ground line, the potential difference between positive bus-bar and negative busbar is 220V, when first switch K1 closure, second switch K2 are disconnected
When, the first balance resistor bridge Rb1 and the first test resistor bridge Rp1 are in parallel between positive bus-bar and ground line, positive bus-bar and ground line
Between resistance reduce, and then voltage between positive bus-bar and ground line reduces, when first switch K1 is disconnected, positive bus-bar with
Voltage between ground line reverts to initial voltage value again, and when first switch K1 repeats switching, the voltage on positive bus-bar is anti-
Multiple variation, forms AC signal.
Current detecting instrument 4 is connect with microcomputer insulation tester 1, for acquiring the current signal in DC bus branch and defeated
Out to microcomputer insulation tester 1.In the present embodiment, as shown in Fig. 2, current detecting instrument 4 includes direct current signal detector 42, hands over
Signal detecting and measuring apparatus 43, single-chip microcontroller 41, third switch K45 and the 4th switch K46 are flowed, direct current signal detector 42 and AC signal are examined
It surveys instrument 43 to be connected in parallel on single-chip microcontroller 41, third switch K45 connects between single-chip microcontroller 41 and direct current signal detector 42, the 4th switch
K46 connects between single-chip microcontroller 41 and alternating current signal detection instrument 43, and single-chip microcontroller 41 is for controlling the switch of third switch K45 and the 4th
The connecting and disconnecting of K46, and the current signal that direct current signal detector 42 or alternating current signal detection instrument 43 acquire is exported to micro-
Machine insulation tester 1.The precision of direct current signal detector 42 is greater than or equal to ± 0.1mA, the precision of alternating current signal detection instrument 43
More than or equal to ± 0.05mA.When whether need to judge has insulation fault between DC bus and DC bus branch, specifically
It is to judge between positive bus-bar and positive bus-bar branch, whether have insulation fault, current detecting between negative busbar and negative busbar branch
Single-chip microcontroller 41 in instrument 4 controls the connection between the 4th switch K46 disconnection alternating current signal detection instrument 43 and single-chip microcontroller 41, direct current letter
It number is connected between detector 42 and single-chip microcontroller 41, direct current signal detector 42 acquires the current signal of DC bus branch and output
To single-chip microcontroller 41, single-chip microcontroller 41 exports the current signal to microcomputer insulation tester 1, the direct current signal detector 42 acquisition
Current signal is mainly direct current signal.
Microcomputer insulation tester 1 is connect with DC bus.Microcomputer insulation tester 1 includes 11 He of AC signal judgment module
Insulation fault judgment module 12.AC signal judgment module 11 is used to receive DC bus, the electric current letter in DC bus branch
Number, and judge DC bus or whether have AC signal with DC bus branch.Insulation fault judgment module 12 is for receiving
Current signal in DC bus and DC bus branch, and judge the current signal of DC bus and the electricity of DC bus branch
It whether identical flows signal, if they are the same, then judges naked failure between DC bus and DC bus branch.More specifically, being
Judge positive bus-bar with the direct current signal of positive bus-bar branch whether identical and between negative busbar and negative busbar branch direct current signal
It is whether identical, if positive bus-bar is identical as the direct current signal of positive bus-bar branch, judge between positive bus-bar and positive bus-bar branch without absolutely
Reason barrier, if negative busbar is identical as the direct current signal of negative busbar branch, judges naked between negative busbar and negative busbar branch
Failure.
Control module 2 is connect with relay 3, and control module 2 sends control instruction to relay 3, and it is continuous to control relay 3
Switching first switch K1 or second switch K2.
Relay 3 is used to receive the control instruction of the output of control module 2, continuous switching first switch K1 or second switch
K2, to generate AC signal on positive bus-bar or in negative busbar.
In another embodiment, microcomputer insulation tester 1 includes two host modules well, and each host module includes handing over
Stream signal detection module 11 and insulation fault judgment module 12, microcomputer insulation tester 1 can connect two sections of DC bus i.e. simultaneously
Two pairs of positive bus-bars, negative busbars detect, and pass through the communication of the serial communication modes such as RS485, CAN between two host modules.
The present invention provides a kind of method mutually altered of detection DC bus branch as shown in figure 3, including the following steps:
Whether S1. detect on DC bus has AC signal, and judge between DC bus and DC bus branch whether
There is insulation fault.Specifically, whether detect in positive bus-bar and negative busbar in DC bus has an AC signal, and positive bus-bar with just
Whether there is insulation fault between bus branch and between negative busbar and negative busbar branch.
If S2. on DC bus without AC signal, and naked failure between DC bus and DC bus branch, then it throws
The test bridge between a DC bus and ground line is cut, to generate AC signal.Specifically, if without friendship in positive bus-bar and negative busbar
Signal is flowed, and naked failure between positive bus-bar and positive bus-bar branch and between negative busbar and negative busbar branch, then control module
2 output control instructions are to relay 3, first switch K1 between the continuous switching positive bus-bar of relay 3 and ground line, to pass through
It is continuous to change the voltage-to-ground on positive bus-bar to generate AC signal, or continuous switching negative busbar and ground connection on positive bus-bar
Second switch K2 between line generates AC signal with the voltage-to-ground continuously changed in negative busbar in negative busbar.
S3. inspection is carried out to another DC bus branch, and judges whether another DC bus branch has AC signal, if
Have, then determines mutually to alter between a DC bus branch and another DC bus branch.Specifically, when the continuous switching of relay 3
One switch K1 generates AC signal on positive bus-bar, then inspection is carried out to negative busbar branch, as 3 switching second switch K2 of relay
AC signal is generated in negative busbar, then inspection is carried out to positive bus-bar branch, and judge positive bus-bar branch or negative busbar branch
Whether AC signal is had, if so, then determining mutually to alter between positive bus-bar branch and negative busbar branch.
Further, in step S1, judge whether there is insulation fault specifically to wrap between DC bus and DC bus branch
Include following step:
S11. the current signal of DC bus is acquired.It specifically include the current signal and negative busbar for acquiring positive bus-bar
Current signal.
S12. DC bus branch current signal is acquired.It specifically include acquiring the current signal of positive bus-bar branch and bearing
The current signal of bus branch.
Whether the current signal for S13. judging DC bus is identical as the current signal of DC bus branch, if DC bus
Current signal it is identical as the current signal of DC bus branch, then judge naked between DC bus and DC bus branch
Failure.It specifically include judging whether the current signal of positive bus-bar is identical and negative busbar as the current signal of positive bus-bar branch
Whether current signal is identical as the current signal of negative busbar branch, if the electric current of the current signal of positive bus-bar and positive bus-bar branch is believed
It is number identical, then naked failure between positive bus-bar and positive bus-bar branch is judged, if the current signal of negative busbar and negative busbar branch
Current signal it is identical, then judge naked failure between negative busbar and negative busbar branch.
In conclusion the AC signal judgment module 11 first passed through inside microcomputer insulation tester 1 judges that DC bus is
It is no to have AC signal, and judge DC bus by insulation fault judgment module 12 and be connected between the branch on DC bus
Whether there is insulation fault, just avoid influence of the external interference factor to testing result in this way, passes through switching positive bus-bar and ground connection
First switch K1 between line, generates AC signal on positive bus-bar, and judges whether the branch of negative busbar has AC signal, or
Second switch K2 between person's switching negative busbar and ground line, judges whether positive bus-bar branch has AC signal, the judgment method
It is simple and convenient, easy to implement, operator can be not necessarily to the branch between accurate judgement positive bus-bar and negative busbar with the presence or absence of mutually altering
Detection automation is realized in member's intervention.
It should be understood that above embodiments only express the preferred embodiment of the present invention, description is more specific and detailed
Carefully, but it cannot be understood as limitations on the scope of the patent of the present invention；It should be pointed out that for the common skill of this field
For art personnel, without departing from the inventive concept of the premise, above-mentioned technical characterstic can be freely combined, can also be done
Several modifications and improvements out, these are all within the scope of protection of the present invention；Therefore, all to be done with scope of the invention as claimed
Equivalents and modification, should belong to the covering scope of the claims in the present invention.
Claims (3)
1. a kind of system for mutually altering of detection DC bus branch, which is characterized in that including microcomputer insulation tester, control module,
Relay, current detecting instrument, first switch K1, second switch K2, first test resistor bridge Rp1, second test resistor bridge Rp2,
First balance resistor bridge Rb1, the second balance resistor bridge Rb2, ground line, the control module is connect with the relay, described
First switch K1 and the first test resistor bridge Rp1 are series in DC bus between positive bus-bar and the ground line, described
Second switch K2 and the second test resistor bridge Rp2 are series in the DC bus between negative busbar and the ground line,
The first balance resistor bridge Rb1 is connected between the positive bus-bar and the ground line, the second balance resistor bridge Rb2 string
It is associated between the negative busbar and the ground line；
The current detecting instrument is connect, for acquiring the current signal in DC bus branch with the microcomputer insulation tester
And it exports to the microcomputer insulation tester；
The microcomputer insulation tester, connect with the DC bus, including AC signal judgment module and insulation fault judgement
Module,
The AC signal judgment module, for receiving the current signal of the DC bus and the DC bus branch, and
AC signal is judged whether there is,
The insulation fault judgment module, for receiving the current signal of the DC bus and the DC bus branch, and
Judge whether the direct current signal of the current bus bar is identical as the current signal of the DC bus branch, if they are the same, then judges
Naked failure between the DC bus and the DC bus branch；
The control module is opened for sending control instruction to the relay with controlling described in the relay switching first
Close the K1 or second switch K2；
The relay, for the first switch K1 or second switch K2 described in switching, to be in series with the first switch
AC signal is generated on the DC bus of K1 or the second switch K2.
2. the system that detection DC bus branch according to claim 1 is mutually altered, which is characterized in that the current detecting instrument
Including direct current signal detector, alternating current signal detection instrument, single-chip microcontroller, third switch and the 4th switch, the direct current signal detection
Instrument and the alternating current signal detection instrument are connected in parallel on the single-chip microcontroller, the third switch connect the direct current signal detector with
Between the single-chip microcontroller, the 4th switch is connect between the alternating current signal detection instrument and the single-chip microcontroller, the single-chip microcontroller
For controlling the connecting and disconnecting of third switch and the 4th switch, and by the direct current signal detector or the friendship
The current signal of stream signal detecting and measuring apparatus acquisition is exported to the microcomputer insulation tester.
3. the system that detection DC bus branch according to claim 2 is mutually altered, which is characterized in that the direct current signal inspection
The precision for surveying instrument is greater than or equal to ± 0.1mA, and the precision of the alternating current signal detection instrument is greater than or equal to ± 0.05mA.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510050574.4A CN105988088B (en) | 2015-01-30 | 2015-01-30 | A kind of method and system that detection DC bus branch is mutually altered |
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| CN201510050574.4A CN105988088B (en) | 2015-01-30 | 2015-01-30 | A kind of method and system that detection DC bus branch is mutually altered |
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| CN105988088A CN105988088A (en) | 2016-10-05 |
| CN105988088B true CN105988088B (en) | 2018-12-04 |
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| CN201510050574.4A Active CN105988088B (en) | 2015-01-30 | 2015-01-30 | A kind of method and system that detection DC bus branch is mutually altered |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106842070A (en) * | 2017-02-04 | 2017-06-13 | 山东鲁能智能技术有限公司 | Direct current mutually alters detecting system and method between a kind of different straight-flow systems |
| CN112394283B (en) * | 2020-12-09 | 2022-07-29 | 广东电网有限责任公司 | Detection apparatus for direct current female gang switch closing state and electric power system |
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