CN109633248A - A kind of observation circuit in direct current output circuit - Google Patents
A kind of observation circuit in direct current output circuit Download PDFInfo
- Publication number
- CN109633248A CN109633248A CN201910106866.3A CN201910106866A CN109633248A CN 109633248 A CN109633248 A CN 109633248A CN 201910106866 A CN201910106866 A CN 201910106866A CN 109633248 A CN109633248 A CN 109633248A
- Authority
- CN
- China
- Prior art keywords
- direct current
- branch
- relay
- current output
- output
- 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.)
- Granted
Links
- 238000012544 monitoring process Methods 0.000 claims abstract description 45
- 238000012360 testing method Methods 0.000 claims abstract description 13
- 230000005611 electricity Effects 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000006698 induction Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000001681 protective effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
- G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Alarm Devices (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention provides a kind of observation circuit in direct current output circuit, the case where DC voltage that the present invention monitors branch by anode and cathode monitoring branch monitors the positive output end in direct current output circuit respectively and negative output terminal exports, when the DC voltage that the positive output end in direct current output circuit exports rises above first threshold voltage, and when the DC voltage of the negative output terminal output in direct current output circuit drops to less than four threshold voltages, negative fault alarm branch exports the first alarm signal；When the DC voltage that the positive output end in direct current output circuit exports drops to less than second threshold voltage, and the DC voltage of the negative output terminal output in direct current output circuit rises above four threshold voltages, positive fault alarm branch exports the second alarm signal.Therefore, the present invention can issue warning note when DC Line Fault occurs in the direct current output circuit of reaying protection test power supply panel in time, and staff is reminded to go to check and solve failure.
Description
Technical field
The present invention relates to circuit protection technical field more particularly to a kind of observation circuits in direct current output circuit.
Background technique
When power plant, substation carry out extension project, direct current system is easy to appear direct current event when access device
Barrier generates malfunction so as to cause protective relaying device, when serious, can damage protective relaying device.
Therefore, it before direct current system access device, needs to debug equipment with reaying protection test power supply panel.Its
In, the power supply of reaying protection test power supply panel access two-way 380/220V is powered for it, and two-way power supply mutual backup, it is ensured that
The reliability of reaying protection test power supply panel power supply.
And the output loop of reaying protection test power supply panel has indicator light, voltmeter, ammeter monitoring, but relay protection
The output loop of experimental power supply screen lacks the monitoring problem of DC Line Fault, so in the output loop of reaying protection test power supply panel
It when there is DC Line Fault, is not easy to be found in time, therefore is easy to damage relay protection device.
Summary of the invention
In view of this, the embodiment of the present invention provides a kind of observation circuit in direct current output circuit, returned with solving direct current output
Road lacks the problem of observation circuit of DC Line Fault.
To achieve the above object, the embodiment of the present invention provides the following technical solutions:
A kind of observation circuit in direct current output circuit is suitable for reaying protection test power supply panel, comprising: anode monitoring branch
Road, cathode monitoring branch, negative fault alarm branch and positive fault alarm branch；Wherein:
The anode monitoring branch is used to monitor the DC voltage of the positive output end output in the direct current output circuit, and
And when the DC voltage of positive output end output rises above first threshold voltage, first control signal is exported, institute is worked as
The DC voltage of positive output end output is stated when dropping to less than second threshold voltage, exports second control signal；
The cathode monitoring branch is used to monitor the DC voltage of the negative output terminal output in the direct current output circuit, and
And when the DC voltage of negative output terminal output rises above third threshold voltage, output third controls signal, works as institute
The DC voltage of negative output terminal output is stated when dropping to less than four threshold voltages, the 4th control signal of output；
The negative fault alarm branch is used for, when receiving the first control signal and the 4th control signal,
Export the first alarm signal；
The positive fault alarm branch is used for, when receiving the second control signal and third control signal,
Export the second alarm signal.
Optionally, the anode monitoring branch, comprising: the coil of first switch, first resistor and the first DC relay；
Wherein:
The coils from parallel connection of coils of the first resistor and first DC relay, one end in parallel and the first switch
One end is connected；Other end ground connection in parallel；
The other end of the first switch is connected with the positive output end in the direct current output circuit；
The control signal output of the coil of first DC relay exports the first control signal or described the
Two control signals.
Optionally, the cathode monitors branch, comprising: the coil of second switch, second resistance and the second DC relay；
Wherein:
The coils from parallel connection of coils of the second resistance and second DC relay, one end in parallel and the second switch
One end is connected；Other end ground connection in parallel；
The other end of the second switch is connected with the negative output terminal in the direct current output circuit；
The control signal output of the coil of second DC relay exports the third control signal or described the
Four control signals.
Optionally, the negative fault alarm branch, comprising: the normally opened contact of the first DC relay, the second direct current relay
The normally-closed contact and first light source alarm unit of device；Wherein:
Normally opened contact one end of first DC relay is connected with the anode of power supply, first DC relay
The normally opened contact other end passes sequentially through normally-closed contact and the first light source alarm unit and the institute of second DC relay
The cathode for stating power supply is connected；Alternatively, normally opened contact one end of first DC relay is connected with the anode of the power supply, institute
State the first DC relay the normally opened contact other end pass sequentially through the first light source alarm unit and second direct current after
The normally-closed contact of electric appliance is connected with the cathode of the power supply；
The control terminal of the normally opened contact of first DC relay receives the first control signal or second control
Signal processed；The control terminal of the normally-closed contact of second DC relay receives the third control signal or the 4th control
Signal.
Optionally, the negative fault alarm branch, further includes: first sound source in parallel with the first light source alarm unit
Alarm unit.
Optionally, the positive fault alarm branch, comprising: the normally-closed contact of the first DC relay, the second direct current relay
The normally opened contact and second light source alarm unit of device；Wherein:
Normally opened contact one end of second DC relay is connected with the anode of power supply, second DC relay
The normally opened contact other end passes sequentially through normally-closed contact and the second light source alarm unit and the institute of first DC relay
The cathode for stating power supply is connected；Alternatively, normally opened contact one end of second DC relay is connected with the anode of the power supply, institute
State the second DC relay the normally opened contact other end pass sequentially through the second light source alarm unit and first direct current after
The normally-closed contact of electric appliance is connected with the cathode of the power supply；
The control terminal of the normally-closed contact of first DC relay receives the first control signal or second control
Signal processed；The control terminal of the normally opened contact of second DC relay receives the third control signal or the 4th control
Signal.
Optionally, the positive fault alarm branch, further includes: second sound source in parallel with the second light source alarm unit
Alarm unit.
Optionally, the positive output end in the direct current output circuit is the anode of the power supply, the direct current output circuit
Negative output terminal is the cathode of the power supply.
Optionally, further includes: N number of direct current output branch；Wherein:
The positive input terminal of the direct current output branch is connected with the positive output end in the direct current output circuit, and the direct current is defeated
The negative input end of out branch is connected with the negative output terminal in the direct current output circuit；
The positive output end of the direct current output branch is connected with one end of load, the negative output terminal of the direct current output branch
It is connected with the other end of load；
Wherein, N is nonnegative integer.
Optionally, the direct current output branch, comprising: be set to the positive input terminal and positive output of the direct current output branch
Air switch between end；
The direct current output branch, comprising: be set between the negative input end and negative output terminal of the direct current output branch
Air switch.
In terms of existing technologies, the present invention monitors branch and cathode by anode and monitors branch to monitor direct current respectively defeated
Out the case where the DC voltage of positive output end and the negative output terminal output in circuit, exported when the positive output end in direct current output circuit
DC voltage rises above first threshold voltage, and the DC voltage of the negative output terminal output in direct current output circuit drops to
When less than four threshold voltages, negative fault alarm branch conducting exports the first alarm signal；When the positive output in direct current output circuit
The DC voltage of end output drops to less than second threshold voltage, and the direct current of the negative output terminal output in direct current output circuit
When pressure rises above third threshold voltage, positive fault alarm branch conducting exports the second alarm signal.Therefore, the present invention exists
When DC Line Fault occurs in the direct current output circuit of reaying protection test power supply panel, warning note can be issued in time, remind work people
Member go to check and solve failure, make reaying protection test power supply panel during equipment debugging can by safer use,
Protective relaying device is also reduced to be risk of damage to.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of schematic diagram of the observation circuit in direct current output circuit provided in an embodiment of the present invention；
Fig. 2 be another embodiment of the present invention provides a kind of direct current output circuit observation circuit in anode monitoring branch
110 schematic diagram；
Fig. 3 be another embodiment of the present invention provides a kind of direct current output circuit observation circuit in cathode monitor branch
120 schematic diagram；
Fig. 4 be another embodiment of the present invention provides a kind of direct current output circuit observation circuit in negative fault alarm branch
The schematic diagram on road 130；
Fig. 5 be another embodiment of the present invention provides a kind of direct current output circuit observation circuit in positive fault alarm branch
The schematic diagram on road 140；
Fig. 6 be another embodiment of the present invention provides a kind of direct current output circuit observation circuit schematic diagram.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
In this application, the terms "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion,
So that the process, method, article or equipment for including a series of elements not only includes those elements, but also including not having
The other element being expressly recited, or further include for elements inherent to such a process, method, article, or device.Do not having
There is the element limited in the case where more limiting by sentence "including a ...", it is not excluded that in the mistake including the element
There is also other identical elements in journey, method, article or equipment.
In order to solve the problems, such as that direct current output circuit lacks DC Line Fault observation circuit, the embodiment of the present invention provides a kind of straight
The observation circuit of output loop is flowed, reaying protection test power supply panel, such as Fig. 1 are suitable for, specific structure includes: anode monitoring branch
110, cathode monitoring branch 120, negative fault alarm branch 130 and positive fault alarm branch 140；Wherein:
The input anode of anode monitoring branch 110 is connected with the positive output end in the direct current output circuit, anode monitoring
The input cathode of branch 110 is grounded；Cathode monitors the input cathode of branch 120 and the negative output in the direct current output circuit
End is connected, and cathode monitors the input anode ground connection of branch 120.
The input anode of negative fault alarm branch 130 is connected with the anode of power supply, the input of negative fault alarm branch 130
End cathode is connected with the cathode of power supply；The input anode of positive fault alarm branch 140 is connected with the anode of the power supply, positive event
The input cathode of barrier alarm branch 140 is connected with the cathode of power supply.
It should be noted that the power supply that negative fault alarm branch 130 and positive fault alarm branch 140 are connected, can be
Independently of the additional power supply in the direct current output circuit；The observation circuit in the direct current output circuit provided in this embodiment at this time,
It not only needs that the port being attached with the positive-negative output end in the direct current output circuit is arranged, it is also necessary to which be negative fault alarm branch
Corresponding power connector end mouth is additionally arranged in road 130 and positive fault alarm branch 140.Alternatively, can also be directly by the direct current
The power supply that output loop is connected as negative fault alarm branch 130 and positive fault alarm branch 140, and then be the two power supply；
At this point, the observation circuit in the direct current output circuit provided in this embodiment, it is only necessary to which setting and the direct current output circuit are just
The port that negative output terminal is attached.It can be depending on its specific application environment, at this for the actual setting of power supply
In the protection scope of application.
First control terminal of the first control terminal of negative fault alarm branch 130 and positive fault alarm branch 140, with anode
The output end for monitoring branch 110 is connected；The of second control terminal of negative fault alarm branch 130 and positive fault alarm branch 140
Two control terminals are connected with the output end of cathode monitoring branch 120.
Concrete operating principle are as follows:
Anode monitoring branch 110 and cathode monitoring branch 120 respectively export the positive output end in direct current output circuit straight
Galvanic electricity pressure and the DC voltage of negative output terminal output carry out real-time monitoring, when anode monitoring branch 110 monitors that direct current output is returned
When the DC voltage of the positive output end output on road rises above first threshold voltage, output end exports first control signal
V1；When the first observation circuit 110 monitors that the DC voltage of the positive output end output in direct current output circuit drops to less than second
When threshold voltage, output end exports second control signal V2.
Wherein, first threshold voltage is the 80% of the voltage rating of the positive output end in direct current output circuit；Second threshold electricity
Pressure is the 10% of the voltage rating of the positive output end in direct current output circuit.
When cathode monitoring branch 120 monitors that the DC voltage of direct current output circuit negative output terminal output rises above the
When three threshold voltages, output end exports third and controls signal V3；When cathode monitoring branch 120 monitors direct current output circuit
When the DC voltage of negative output terminal drops to less than four threshold voltages, the 4th control signal V4 of output end output.
Wherein, third threshold voltage is the 80% of the voltage rating of the negative output terminal in direct current output circuit；4th threshold value electricity
Pressure is the 10% of the voltage rating of the negative output terminal in direct current output circuit.
When the first control terminal of negative fault alarm branch 130 receives first control signal V1, the second control terminal is received
To the 4th control signal V4, then negative fault alarm branch 130 exports the first alarm signal.
When the first control terminal of positive fault alarm branch 140 receives second control signal V2, the second control terminal is received
Signal V3 is controlled to third, then positive fault alarm branch 140 exports the second alarm signal.
In terms of existing technologies, the present invention monitors branch and cathode by anode and monitors branch to monitor direct current respectively defeated
Out the case where the DC voltage of positive output end and the negative output terminal output in circuit, exported when the positive output end in direct current output circuit
DC voltage rises above first threshold voltage, and the DC voltage of the negative output terminal output in direct current output circuit drops to
When less than four threshold voltages, negative fault alarm branch conducting exports the first alarm signal；When the positive output in direct current output circuit
The DC voltage of end output drops to less than second threshold voltage, and the direct current of the negative output terminal output in direct current output circuit
When pressure rises above third threshold voltage, positive fault alarm branch conducting exports the second alarm signal.Therefore, the present invention exists
When DC Line Fault occurs in the direct current output circuit of reaying protection test power supply panel, warning note can be issued in time, remind work people
Member go to check and solve failure, make reaying protection test power supply panel during equipment debugging can by safer use,
Protective relaying device is also reduced to be risk of damage to.
Optionally, such as Fig. 2, in another embodiment of the invention, a kind of embodiment of anode monitoring branch 110 has
Body structure includes: the coil 111 of first switch S1, first resistor R1 and the first DC relay；Wherein:
First resistor R1 is in parallel with the coil 111 of the first DC relay, one end of one end in parallel and first switch S1
It is connected；The input cathode of the other end in parallel as anode monitoring branch 110.
Input anode of the other end of first switch S1 as anode monitoring branch 110；The line of first DC relay
Output end of the control signal output of circle 111 as anode monitoring branch 110.
Optionally, first resistor R1 is the resistance that resistance value is 20 kilo-ohms.
Specific working principle are as follows:
It is closed first switch S1, anode monitoring branch 110 is connected, and electric current flows through first resistor R1, on first resistor R1
Partial pressure is generated, since the coil 111 of the first DC relay is in parallel with first resistor R1, so the coil of the first DC relay
The voltage at 111 pairs of both ends first resistor R1 is monitored；Again because one end of first resistor R1 passes through first switch S1 and direct current
The positive output end of output loop is connected, and the other end of first resistor R1 is grounded, so the coil 111 of the first DC relay is right
The voltage at the both ends first resistor R1 is monitored, and the DC voltage for being equal to the positive output end output to direct current output circuit carries out
Monitoring.
When on the DC voltage of positive output end output that the coil 111 of the first DC relay monitors direct current output circuit
When being raised to greater than first threshold voltage, control signal output output the first control letter of the coil 111 of the first DC relay
Number V1；When the coil 111 of the first DC relay monitors the DC voltage decline of the positive output end output in direct current output circuit
To when being less than second threshold voltage, the control signal output of the coil 111 of the first DC relay exports second control signal
V2。
In addition, staff can be opened by disconnecting first after negative fault alarm branch 130 exports the first alarm signal
S1 is closed, the coil 111 of the first DC relay is resetted, so that negative fault alarm branch 130 be made to form open circuit, stops its output
First alarm signal；Also, after staff's maintenance, it can check that direct current output is returned by closure first switch S1
Whether there is also DC Line Faults on road, if negative fault alarm branch 130 exports the first alarm signal after closure first switch S1,
Then there are still DC Line Faults in direct current output circuit, if negative fault alarm branch 130 is not alarmed after closure first switch S1,
Then DC Line Fault is not present in direct current output circuit.
It should be noted that the coil 111 of the first DC relay can be produced from when first switch S1 is opened or closed
Feel phenomenon, while having self induction electromotive force generation, and the coil 111 of the first DC relay with self induction electromotive force is equivalent to electricity
Source can have an impact other electronic devices.And the first resistor R1 in parallel with the coil of the first DC relay 111 can be
When first switch S1 is opened or closed, the self induction electromotive force that the coil 111 of the first DC relay of consumption generates reaches and protects it
The purpose of his electronic device.
It should be noted that the present embodiment provides only a kind of embodiment of anode monitoring branch 110, practical application
In, anode monitoring branch 110 can also be realized using comparator, or be also possible to the unit being made of other electrical components
Or independent module, as long as can be realized the other embodiments of the anode monitoring branch 110 of same purpose in this hair
In bright protection scope.
Remaining structure and working principle are same as the previously described embodiments, and details are not described herein again.
Optionally, such as Fig. 3, in another embodiment of the invention, cathode monitors a kind of embodiment of branch 120, tool
Body structure includes: the coil 121 of second switch S2, second resistance R2 and the second DC relay；Wherein:
Second resistance R2 is in parallel with the coil 121 of the second DC relay, one end of one end in parallel and second switch S2
It is connected；The anode of the other end in parallel as the input terminal of cathode monitoring branch 120.
Input cathode of the other end of second switch S2 as cathode monitoring branch 120；The line of second DC relay
Output end of the control signal output of circle 121 as cathode monitoring branch 120.
It should be noted that second resistance R2 is the resistance that resistance value is 20 kilo-ohms.
Specific working principle:
It is closed second switch S2, cathode detection branch 110 is connected, and electric current flows through second resistance R2, on second resistance R2
Partial pressure is generated, since the coil 121 of the second DC relay is in parallel with second resistance R2, so the coil of the second DC relay
The voltage at 121 pairs of both ends second resistance R2 is monitored；Again because one end of second resistance R2 passes through second switch S2 and direct current
The negative output terminal of output loop is connected, and the other end of second resistance R2 is grounded, so the coil 121 of the second DC relay is right
The voltage at the both ends first resistor R1 is monitored, and the DC voltage for being equal to the negative output terminal output to direct current output circuit carries out
Monitoring.
When on the DC voltage of negative output terminal output that the coil 121 of the second DC relay monitors direct current output circuit
When being raised to greater than third threshold voltage, the control signal output output third control letter of the coil 121 of the second DC relay
Number V3；When the coil 121 of the second DC relay monitors the DC voltage decline of the negative output terminal output in direct current output circuit
When to less than four threshold voltages, the 4th control signal of control signal output output of the coil 121 of the second DC relay
V4。
In addition, staff can be opened by disconnecting second after positive fault alarm branch 140 exports the second alarm signal
S2 is closed, the coil 121 of the second DC relay is resetted, so that positive fault alarm branch 140 be made to form open circuit, stops its output
Second alarm signal；Also, after staff's maintenance, it can check that direct current output is returned by closure second switch S2
Whether there is also DC Line Faults on road, if positive fault alarm branch 140 exports the second alarm signal after closure second switch S2,
Then there are still DC Line Faults in direct current output circuit, if positive fault alarm branch 140 is not alarmed after closure second switch S2,
Then DC Line Fault is not present in direct current output circuit.
It should be noted that the coil 121 of the second DC relay can be produced from when second switch S2 is opened or closed
Feel phenomenon, while having self induction electromotive force generation, and the coil 121 of the second DC relay with self induction electromotive force is equivalent to electricity
Source can have an impact other electronic devices.And the second resistance R2 in parallel with the coil of the second DC relay 121 can be
When second switch S2 is opened or closed, the self induction electromotive force that the coil 121 of the second DC relay of consumption generates reaches and protects it
The purpose of his electronic device.
It should be noted that the present embodiment provides only a kind of embodiment of cathode monitoring branch 120, cathode monitoring branch
The another embodiment on road 120 can be comparator, be also possible to the unit being made of other electrical components or independent mould
Block, as long as can be realized the other embodiments of the cathode monitoring branch 120 of same purpose in protection model of the invention
In enclosing.
Remaining structure and working principle are same as the previously described embodiments, and details are not described herein again.
Optionally, such as Fig. 4, in another embodiment of the invention, a kind of embodiment of negative fault alarm branch 130,
Specific structure includes: the normally-closed contact 132 and the first light of the normally opened contact 131 of the first DC relay, the second DC relay
Source alarm unit 133；Wherein:
Input anode of 131 one end of normally opened contact of first DC relay as negative fault alarm branch 130, first
131 other end of normally opened contact of DC relay is single by normally-closed contact 132 and the first light source alarm of the second DC relay
One end of member 133 is connected, input cathode of the other end of first light source alarm unit 133 as negative fault alarm branch；Or
Person, input anode of 131 one end of normally opened contact of the first DC relay as negative fault alarm branch 130, the first direct current
131 other end of normally opened contact of relay passes through the normally-closed contact 132 of first light source alarm unit 133 and the second DC relay
One end be connected, the other end of the normally-closed contact 132 of the second DC relay is negative as the input terminal of negative fault alarm branch 130
Pole.
It should be noted that above-mentioned connection type is preferred embodiment, the normally opened touching of the first DC relay in practical application
The normally-closed contact 132 of the 131, second DC relay of point and 133 three of first light source alarm unit need to only be cascaded can
To realize the function of negative fault alarm branch 130, so regardless of three is cascaded in what order, in guarantor of the invention
It protects in range.
First control terminal of the control terminal of the normally opened contact 131 of first DC relay as negative fault alarm branch 130；
Second control terminal of the control terminal of the normally-closed contact 132 of second DC relay as negative fault alarm branch 130.
Specific working principle are as follows:
When the control terminal of the normally opened contact 131 of the first DC relay receives the control signal of anode monitoring branch 110
When the first control signal V1 of output end output, by closed in itself；When the control terminal of the normally-closed contact 132 of the second DC relay
When receiving the 4th control signal V4 of the control signal output output of cathode monitoring branch 120, by closed in itself.
When the normally opened contact 131 of the first DC relay and the normally-closed contact 132 of the second DC relay, when being all closed,
First light source alarm unit 133 issues first light source alarm signal.
It should be noted that the way of realization of first light source alarm unit 133 can be alarm, it is also possible to other solely
Vertical electronic device or the unit being made of discrete device, as long as can be realized other ways of realization of same purpose,
It is within the scope of the invention.
Optionally, negative fault alarm branch 130 further includes the first sound source alarm unit 134；First sound source alarm unit 134
It is in parallel with first light source alarm unit 133；When the first DC relay normally opened contact 131 and the second DC relay it is normally closed
Contact 132, when being all closed, the conducting of the first sound source alarm unit 134 issues the first sound source alarm signal, solves light source alarm
Signal is not easy the problem of being found, and can effectively remind work people at the first time when DC Line Fault occurs in direct current output circuit
Member, avoids the damage of equipment.
It should be noted that the way of realization of the first sound source alarm unit 134 can be loudspeaker, intelligent sound box can be,
The module for being also possible to other independent electronic devices or being made of discrete device, as long as can be realized same purpose
Other ways of realization, are within the scope of the invention.
It should be noted that the present embodiment provides only a kind of embodiment of negative fault alarm branch 130, negative failure report
The another embodiment of alert branch 130 can be switching tube, be also possible to the unit being made of other electrical components or independence
Module, as long as can be realized the other embodiments of the negative fault alarm branch 130 of same purpose of the invention
In protection scope.
Remaining structure and working principle are same as the previously described embodiments, and details are not described herein again.
Optionally, such as Fig. 5, in another embodiment of the invention, a kind of embodiment of positive fault alarm branch 140,
Specific structure includes: the normally opened contact 142 and the second light of the normally-closed contact 141 of the first DC relay, the second DC relay
Source alarm unit 143；Wherein:
Input anode of 142 one end of normally opened contact of second DC relay as positive fault alarm branch 140, second
142 other end of normally opened contact of DC relay is single by normally-closed contact 141 and the second light source alarm of the first DC relay
One end of member 143 is connected, input cathode of the other end of second light source alarm unit 143 as positive fault alarm branch 140；
Alternatively, input anode of 142 one end of normally opened contact of the second DC relay as positive fault alarm branch 140, second is straight
142 other end of normally opened contact of current relay passes through the normally-closed contact of second light source alarm unit 143 and the first DC relay
141 one end is connected, input of the other end of the normally-closed contact 141 of the first direct current current-collector as positive fault alarm branch 140
Hold cathode.
It should be noted that above-mentioned connection type is preferred embodiment, the normally closed touching of the first DC relay in practical application
The normally opened contact 142 of the 141, second DC relay of point and 143 three of second light source alarm unit need to only be cascaded can
To realize the function of negative fault alarm branch 130, so regardless of three is cascaded in what order, in guarantor of the invention
It protects in range.
First control terminal of the control terminal of the normally-closed contact 141 of first DC relay as positive fault alarm branch 140；
Second control terminal of the control terminal of the normally opened contact 142 of second DC relay as positive fault alarm branch 140.
Concrete operating principle are as follows:
When the control terminal of the normally-closed contact 141 of the first DC relay receives the control signal of anode monitoring branch 110
When the second control signal of output end output, by closed in itself；When the control termination of the normally opened contact 142 of the second DC relay
When receiving the third control signal of the control signal output output of cathode monitoring branch 120, by closed in itself.
When the normally-closed contact 141 of the first DC relay and the normally opened contact 142 of the second DC relay, when being all closed,
Second light source alarm unit 143 issues second light source alarm signal.
It should be noted that the way of realization of second light source alarm unit 143 can be alarm, it is also possible to other solely
Vertical electronic device or the unit being made of discrete device, as long as can be realized other ways of realization of same purpose,
It is within the scope of the invention.
Optionally, positive fault alarm branch 140 further includes the second sound source alarm unit 144；Second sound source alarm unit 144
It is in parallel with second light source alarm unit 143；When the first DC relay normally-closed contact 141 and the second DC relay it is normally opened
Contact 142, when being all closed, the conducting of the second sound source alarm unit 144 issues the second sound source alarm signal, solves light source alarm
Signal is not easy the problem of being found, and can effectively remind work people at the first time when DC Line Fault occurs in direct current output circuit
Member, avoids the damage of equipment.
It should be noted that the way of realization of the second sound source alarm unit 144 can be loudspeaker, intelligent sound box can be,
The module for being also possible to other independent electronic devices or being made of discrete device, as long as can be realized same purpose
Other ways of realization, are within the scope of the invention.
It should be noted that the present embodiment provides only a kind of embodiment of positive fault alarm branch 140, positive failure report
The another embodiment of alert branch 140 can be switching tube, be also possible to the unit being made of other electrical components or independence
Module, as long as can be realized the other embodiments of the positive fault alarm branch 140 of same purpose of the invention
In protection scope.
Remaining structure and working principle are same as the previously described embodiments, and details are not described herein again.
Optionally, in another embodiment of the invention such as Fig. 6 (in figure only by taking two direct current output branches as an example), upper
On the basis of stating embodiment, the observation circuit in direct current output circuit, further includes: N number of direct current output branch；Wherein:
The positive input terminal of direct current output branch is connected with the positive output end in direct current output circuit, and bearing for direct current output branch is defeated
Enter end to be connected with the negative output terminal in direct current output circuit.
The positive output end of direct current output branch is connected with one end of required equipment, the negative output terminal of direct current output branch and institute
The other end of equipment is needed to be connected；Wherein, N is nonnegative integer.
Optionally, direct current output branch includes the sky being set between the positive input terminal and positive output end of direct current output branch
Air cock, alternatively, including the air switch being set between the negative input end and negative output terminal of direct current output branch.
It should be noted that the number of N is chosen according to the actual needs.
In use, load is connected between two output ends of direct current output branch, it is closed air switch, then in load
There is electric current to pass through；If direct current output branch breaks down, air switch can be automatically powered off, and to protect load, prevent load from damaging
It is bad.
Remaining structure and working principle are same as the previously described embodiments, and details are not described herein again.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (10)
1. a kind of observation circuit in direct current output circuit is suitable for reaying protection test power supply panel characterized by comprising just
Pole monitors branch, cathode monitoring branch, negative fault alarm branch and positive fault alarm branch；Wherein:
The anode monitoring branch is used to monitor the DC voltage of the positive output end output in the direct current output circuit, also, works as
When the DC voltage of positive output end output rises above first threshold voltage, export first control signal, when it is described just
When the DC voltage of output end output drops to less than second threshold voltage, second control signal is exported；
The cathode monitoring branch is used to monitor the DC voltage of the negative output terminal output in the direct current output circuit, also, works as
When the DC voltage of the negative output terminal output rises above third threshold voltage, output third controls signal, when described negative
When the DC voltage of output end output drops to less than four threshold voltages, the 4th control signal of output；
The negative fault alarm branch is used for, when receiving the first control signal and the 4th control signal, output
First alarm signal；
The positive fault alarm branch is used for, when receiving the second control signal and third control signal, output
Second alarm signal.
2. the observation circuit in direct current output circuit according to claim 1, which is characterized in that the anode monitoring branch,
It include: the coil of first switch, first resistor and the first DC relay；Wherein:
The coils from parallel connection of coils of the first resistor and first DC relay, one end of one end in parallel and the first switch
It is connected；Other end ground connection in parallel；
The other end of the first switch is connected with the positive output end in the direct current output circuit；
The control signal output of the coil of first DC relay exports the first control signal or second control
Signal processed.
3. the observation circuit in direct current output circuit according to claim 1, which is characterized in that the cathode monitors branch,
It include: the coil of second switch, second resistance and the second DC relay；Wherein:
The coils from parallel connection of coils of the second resistance and second DC relay, one end of one end in parallel and the second switch
It is connected；Other end ground connection in parallel；
The other end of the second switch is connected with the negative output terminal in the direct current output circuit；
The control signal output of the coil of second DC relay exports the third control signal or the 4th control
Signal processed.
4. the observation circuit in direct current output circuit according to claim 1, which is characterized in that the negative fault alarm branch
Road, comprising: the normally opened contact of the first DC relay, the normally-closed contact of the second DC relay and first light source alarm unit；
Wherein:
Normally opened contact one end of first DC relay is connected with the anode of power supply, first DC relay it is normally opened
The contact other end passes sequentially through the normally-closed contact and the first light source alarm unit and the electricity of second DC relay
The cathode in source is connected；Alternatively, normally opened contact one end of first DC relay is connected with the anode of the power supply, described
The normally opened contact other end of one DC relay passes sequentially through the first light source alarm unit and second DC relay
Normally-closed contact be connected with the cathode of the power supply；
The control terminal of the normally opened contact of first DC relay receives the first control signal or the second control letter
Number；The control terminal of the normally-closed contact of second DC relay receives the third control signal or the 4th control letter
Number.
5. the observation circuit in direct current output circuit according to claim 4, which is characterized in that the negative fault alarm branch
Road, further includes: the first sound source alarm unit in parallel with the first light source alarm unit.
6. the observation circuit in direct current output circuit according to claim 1, which is characterized in that the positive fault alarm branch
Road, comprising: the normally-closed contact of the first DC relay, the normally opened contact of the second DC relay and second light source alarm unit；
Wherein:
Normally opened contact one end of second DC relay is connected with the anode of power supply, second DC relay it is normally opened
The contact other end passes sequentially through the normally-closed contact and the second light source alarm unit and the electricity of first DC relay
The cathode in source is connected；Alternatively, normally opened contact one end of second DC relay is connected with the anode of the power supply, described
The normally opened contact other end of two DC relays passes sequentially through the second light source alarm unit and first DC relay
Normally-closed contact be connected with the cathode of the power supply；
The control terminal of the normally-closed contact of first DC relay receives the first control signal or the second control letter
Number；The control terminal of the normally opened contact of second DC relay receives the third control signal or the 4th control letter
Number.
7. the observation circuit in direct current output circuit according to claim 6, which is characterized in that the positive fault alarm branch
Road, further includes: the second sound source alarm unit in parallel with the second light source alarm unit.
8. according to the observation circuit in the described in any item direct current output circuits claim 4-7, which is characterized in that the direct current is defeated
The positive output end in circuit is the anode of the power supply out, and the negative output terminal in the direct current output circuit is the cathode of the power supply.
9. the observation circuit in direct current output circuit according to claim 1-7, which is characterized in that further include: it is N number of
Direct current output branch；Wherein:
The positive input terminal of the direct current output branch is connected with the positive output end in the direct current output circuit, the direct current output branch
The negative input end on road is connected with the negative output terminal in the direct current output circuit；
The positive output end of the direct current output branch is connected with one end of load, the negative output terminal of the direct current output branch and negative
The other end of load is connected；
Wherein, N is nonnegative integer.
10. the observation circuit in direct current output circuit according to claim 9, which is characterized in that the direct current output branch,
It include: the air switch being set between the positive input terminal and positive output end of the direct current output branch；
The direct current output branch, comprising: the sky being set between the negative input end and negative output terminal of the direct current output branch
Air cock.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910106866.3A CN109633248B (en) | 2019-02-02 | 2019-02-02 | Monitoring circuit of direct current output loop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910106866.3A CN109633248B (en) | 2019-02-02 | 2019-02-02 | Monitoring circuit of direct current output loop |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109633248A true CN109633248A (en) | 2019-04-16 |
| CN109633248B CN109633248B (en) | 2024-03-19 |
Family
ID=66064935
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910106866.3A Active CN109633248B (en) | 2019-02-02 | 2019-02-02 | Monitoring circuit of direct current output loop |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109633248B (en) |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4613769A (en) * | 1984-08-13 | 1986-09-23 | National Semiconductor Corporation | Direct current coupled peak to peak detector circuit |
| GB9322523D0 (en) * | 1992-10-30 | 1993-12-22 | Gec Alsthom Ltd | Circuit breaker trip circuit supervision |
| JPH07110351A (en) * | 1993-09-20 | 1995-04-25 | Choru Kim Sang | Grounding-state monitoring device for relay used for multiplex dc load |
| JP2012253901A (en) * | 2011-06-02 | 2012-12-20 | Chugoku Electric Power Co Inc:The | Direct current ground fault detection device, method for detecting ground fault of direct current circuit and method for switching direct current power source |
| CN203224558U (en) * | 2013-04-12 | 2013-10-02 | 国家电网公司 | Relay protection screen direct current power supply monitoring and indicating device |
| CN103364680A (en) * | 2013-05-08 | 2013-10-23 | 重庆艾派科斯科技有限公司 | Opening current detector-based direct current grounding alarm |
| CN203278720U (en) * | 2013-05-30 | 2013-11-06 | 中山大洋电机股份有限公司 | Port reusing circuit of microprocessor and applied direct-current brushless motor of port reusing circuit |
| CN104535906A (en) * | 2014-12-17 | 2015-04-22 | 国家电网公司 | Method for monitoring and positioning instant insulation faults of direct current system and device for implementing method |
| CN204290398U (en) * | 2014-12-08 | 2015-04-22 | 上海航天有线电厂有限公司 | A kind of direct current output switch circuit |
| JP2015162908A (en) * | 2014-02-26 | 2015-09-07 | 住友電気工業株式会社 | DC voltage supply circuit and ground fault detection circuit |
| CN204993057U (en) * | 2015-06-10 | 2016-01-20 | 上海灿瑞科技股份有限公司 | Step -down direct current transducer |
| CN206281925U (en) * | 2016-11-30 | 2017-06-27 | 国网江苏省电力公司连云港供电公司 | A kind of DC grounding monitor instrument |
| CN108196171A (en) * | 2018-01-24 | 2018-06-22 | 湖南金杯新能源发展有限公司 | Insulation detection device |
| CN209673880U (en) * | 2019-02-02 | 2019-11-22 | 华润新能源(大同阳高)风能有限公司 | A kind of observation circuit in direct current output circuit |
-
2019
- 2019-02-02 CN CN201910106866.3A patent/CN109633248B/en active Active
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4613769A (en) * | 1984-08-13 | 1986-09-23 | National Semiconductor Corporation | Direct current coupled peak to peak detector circuit |
| GB9322523D0 (en) * | 1992-10-30 | 1993-12-22 | Gec Alsthom Ltd | Circuit breaker trip circuit supervision |
| JPH07110351A (en) * | 1993-09-20 | 1995-04-25 | Choru Kim Sang | Grounding-state monitoring device for relay used for multiplex dc load |
| JP2012253901A (en) * | 2011-06-02 | 2012-12-20 | Chugoku Electric Power Co Inc:The | Direct current ground fault detection device, method for detecting ground fault of direct current circuit and method for switching direct current power source |
| CN203224558U (en) * | 2013-04-12 | 2013-10-02 | 国家电网公司 | Relay protection screen direct current power supply monitoring and indicating device |
| CN103364680A (en) * | 2013-05-08 | 2013-10-23 | 重庆艾派科斯科技有限公司 | Opening current detector-based direct current grounding alarm |
| CN203278720U (en) * | 2013-05-30 | 2013-11-06 | 中山大洋电机股份有限公司 | Port reusing circuit of microprocessor and applied direct-current brushless motor of port reusing circuit |
| JP2015162908A (en) * | 2014-02-26 | 2015-09-07 | 住友電気工業株式会社 | DC voltage supply circuit and ground fault detection circuit |
| CN204290398U (en) * | 2014-12-08 | 2015-04-22 | 上海航天有线电厂有限公司 | A kind of direct current output switch circuit |
| CN104535906A (en) * | 2014-12-17 | 2015-04-22 | 国家电网公司 | Method for monitoring and positioning instant insulation faults of direct current system and device for implementing method |
| CN204993057U (en) * | 2015-06-10 | 2016-01-20 | 上海灿瑞科技股份有限公司 | Step -down direct current transducer |
| CN206281925U (en) * | 2016-11-30 | 2017-06-27 | 国网江苏省电力公司连云港供电公司 | A kind of DC grounding monitor instrument |
| CN108196171A (en) * | 2018-01-24 | 2018-06-22 | 湖南金杯新能源发展有限公司 | Insulation detection device |
| CN209673880U (en) * | 2019-02-02 | 2019-11-22 | 华润新能源(大同阳高)风能有限公司 | A kind of observation circuit in direct current output circuit |
Non-Patent Citations (1)
| Title |
|---|
| 黄海宏等: "基于差流检测法的分布式直流接地巡检系统", 《电子测量与仪器学报》, vol. 23, no. 11, pages 36 - 41 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109633248B (en) | 2024-03-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105896469B (en) | A kind of circuit protection device of automatic monitoring operation troubles | |
| CN103792505A (en) | Ground fault simulation device for electric power direct current system | |
| CN203965564U (en) | Ground fault detection circuit | |
| CN104198926A (en) | Anti-trip loop test device for breaker and control method thereof | |
| CN209673880U (en) | A kind of observation circuit in direct current output circuit | |
| CN203849376U (en) | Breaker anti-tripping loop testing apparatus | |
| CN108418173A (en) | A kind of arc-fault circuit interrupter | |
| CN201955425U (en) | Insulation fault positioning device in hospital isolated power supply system | |
| CN210690728U (en) | Direct current grounding test box | |
| CN208705393U (en) | A kind of amperometry warning device for CVT secondary voltage test device | |
| CN109633248A (en) | A kind of observation circuit in direct current output circuit | |
| CN110672984A (en) | Portable direct current system ground fault detection device | |
| CN202948049U (en) | Leakage alarm system of intelligent power distribution cabinet body | |
| CN108583317A (en) | A kind of charging pile monitoring system | |
| CN213782868U (en) | Protection operation box suitable for electrified railway | |
| CN109217742B (en) | Control system of permanent magnet synchronous motor | |
| CN208636368U (en) | A kind of testing current analysis diagnostic device for CVT secondary voltage test device | |
| CN207717948U (en) | Fire-fighting equipment power self test circuit | |
| CN108859873B (en) | Safe negative pole one-way conduction device with fault diagnosis function | |
| CN208571574U (en) | Low-voltage platform area neutral point drifting protective device | |
| CN202693726U (en) | Detection circuit and detection system for electric transmission and transformation equipment | |
| CN207588552U (en) | Ups power failure detector | |
| CN211856687U (en) | Low-voltage outgoing line running state monitoring device | |
| CN202014037U (en) | Demarcation switch cabinet for cable line | |
| CN202651659U (en) | Drainage apparatus capable of replacing isolating switch with load |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |