CN109633248B - Monitoring circuit of direct current output loop - Google Patents
Monitoring circuit of direct current output loop Download PDFInfo
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- CN109633248B CN109633248B CN201910106866.3A CN201910106866A CN109633248B CN 109633248 B CN109633248 B CN 109633248B CN 201910106866 A CN201910106866 A CN 201910106866A CN 109633248 B CN109633248 B CN 109633248B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 91
- 238000012360 testing method Methods 0.000 claims abstract description 15
- 230000003247 decreasing effect Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 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
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- 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
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
- Emergency Alarm Devices (AREA)
Abstract
The invention provides a monitoring circuit of a direct current output loop, which is characterized in that a positive monitoring branch and a negative monitoring branch are used for respectively monitoring the conditions of direct current voltages output by a positive output end and a negative output end of the direct current output loop, and when the direct current voltage output by the positive output end of the direct current output loop is increased to be greater than a first threshold voltage and the direct current voltage output by the negative output end of the direct current output loop is decreased to be less than a fourth threshold voltage, a negative fault alarm branch outputs a first alarm signal; and when the direct current voltage output by the positive output end of the direct current output loop is reduced to be smaller than the second threshold voltage, and the direct current voltage output by the negative output end of the direct current output loop is increased to be larger than the fourth threshold voltage, the positive fault alarm branch circuit outputs a second alarm signal. Therefore, when the direct current output loop of the relay protection test power supply screen has a direct current fault, the relay protection test power supply screen can timely send out an alarm prompt to remind a worker to check and solve the fault.
Description
Technical Field
The invention relates to the technical field of circuit protection, in particular to a monitoring circuit of a direct current output loop.
Background
When a power plant and a transformer substation are subjected to extension engineering, a direct current system is easy to generate direct current faults when being connected to equipment, so that misoperation of the relay protection device is caused, and the relay protection device can be damaged when serious.
Therefore, before the direct current system is connected to the equipment, the relay protection test power supply screen is required to be used for debugging the equipment. The relay protection test power supply screen is connected with two paths of 380/220V power supplies for supplying power, and the two paths of power supplies are mutually standby, so that the reliability of the power supply of the relay protection test power supply screen is ensured.
The output loop of the relay protection test power supply screen is monitored by the indicator lamp, the voltmeter and the ammeter, but the output loop of the relay protection test power supply screen lacks the monitoring problem of direct current faults, so that the direct current faults of the output loop of the relay protection test power supply screen are not easy to find in time, and the relay protection equipment is easy to damage.
Disclosure of Invention
Therefore, the embodiment of the invention provides a monitoring circuit of a direct current output loop, so as to solve the problem that the direct current output loop lacks a monitoring circuit of a direct current fault.
In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:
a monitoring circuit of a direct current output loop is suitable for a relay protection test power supply screen, and comprises: the system comprises an anode monitoring branch, a cathode monitoring branch, a negative fault alarm branch and a positive fault alarm branch; wherein:
the positive electrode monitoring branch is used for monitoring the direct current voltage output by the positive output end of the direct current output loop, outputting a first control signal when the direct current voltage output by the positive output end rises to be larger than a first threshold voltage, and outputting a second control signal when the direct current voltage output by the positive output end drops to be smaller than a second threshold voltage;
the negative electrode monitoring branch is used for monitoring the direct current voltage output by the negative output end of the direct current output loop, outputting a third control signal when the direct current voltage output by the negative output end rises to be greater than a third threshold voltage, and outputting a fourth control signal when the direct current voltage output by the negative output end falls to be less than a fourth threshold voltage;
the negative fault alarm branch is used for outputting a first alarm signal when receiving the first control signal and the fourth control signal;
the positive fault alarm branch is used for outputting a second alarm signal when the second control signal and the third control signal are received.
Optionally, the positive electrode monitoring branch includes: a first switch, a first resistor and a coil of a first direct current relay; wherein:
the first resistor is connected with the coil of the first direct current relay in parallel, and one end of the parallel connection is connected with one end of the first switch; the other end of the parallel connection is grounded;
the other end of the first switch is connected with the positive output end of the direct current output loop;
and a control signal output end of a coil of the first direct current relay outputs the first control signal or the second control signal.
Optionally, the negative electrode monitoring branch includes: a second switch, a second resistor and a coil of a second direct current relay; wherein:
the second resistor is connected with the coil of the second direct current relay in parallel, and one end of the parallel connection is connected with one end of the second switch; the other end of the parallel connection is grounded;
the other end of the second switch is connected with the negative output end of the direct current output loop;
and a control signal output end of a coil of the second direct current relay outputs the third control signal or the fourth control signal.
Optionally, the negative fault alarm branch includes: a normally open contact of the first direct current relay, a normally closed contact of the second direct current relay and a first light source alarm unit; wherein:
one end of a normally open contact of the first direct current relay is connected with a positive electrode of a power supply, and the other end of the normally open contact of the first direct current relay is connected with a negative electrode of the power supply sequentially through a normally closed contact of the second direct current relay and the first light source alarm unit; or one end of the normally open contact of the first direct current relay is connected with the positive electrode of the power supply, and the other end of the normally open contact of the first direct current relay is connected with the negative electrode of the power supply sequentially through the first light source alarm unit and the normally closed contact of the second direct current relay;
the control end of the normally open contact of the first direct current relay receives the first control signal or the second control signal; and a control end of the normally closed contact of the second direct current relay receives the third control signal or the fourth control signal.
Optionally, the negative fault alarm branch further includes: and the first sound source alarm unit is connected with the first light source alarm unit in parallel.
Optionally, the positive fault alarm branch includes: a normally closed contact of the first direct current relay, a normally open contact of the second direct current relay and a second light source alarm unit; wherein:
one end of a normally open contact of the second direct current relay is connected with the positive electrode of the power supply, and the other end of the normally open contact of the second direct current relay is connected with the negative electrode of the power supply sequentially through the normally closed contact of the first direct current relay and the second light source alarm unit; or one end of the normally open contact of the second direct current relay is connected with the positive electrode of the power supply, and the other end of the normally open contact of the second direct current relay is connected with the negative electrode of the power supply sequentially through the second light source alarm unit and the normally closed contact of the first direct current relay;
the control end of the normally closed contact of the first direct current relay receives the first control signal or the second control signal; and a control end of a normally open contact of the second direct current relay receives the third control signal or the fourth control signal.
Optionally, the positive fault alarm branch further includes: and the second sound source alarm unit is connected with the second light source alarm unit in parallel.
Optionally, the positive output end of the direct current output loop is the positive electrode of the power supply, and the negative output end of the direct current output loop is the negative electrode of the power supply.
Optionally, the method further comprises: n dc output branches; wherein:
the positive input end of the direct current output branch is connected with the positive output end of the direct current output loop, and the negative input end of the direct current output branch is connected with the negative output end of the direct current output loop;
the positive output end of the direct current output branch is connected with one end of the load, and the negative output end of the direct current output branch is connected with the other end of the load;
wherein N is a non-negative integer.
Optionally, the dc output branch includes: the air switch is arranged between the positive input end and the positive output end of the direct current output branch;
the direct current output branch circuit comprises: and the air switch is arranged between the negative input end and the negative output end of the direct current output branch.
Compared with the prior art, the invention monitors the direct current voltage output by the positive output end and the negative output end of the direct current output loop through the positive monitoring branch and the negative monitoring branch respectively, and when the direct current voltage output by the positive output end of the direct current output loop is increased to be larger than a first threshold voltage and the direct current voltage output by the negative output end of the direct current output loop is decreased to be smaller than a fourth threshold voltage, the negative fault alarm branch is conducted to output a first alarm signal; when the direct current voltage output by the positive output end of the direct current output loop is reduced to be smaller than the second threshold voltage, and the direct current voltage output by the negative output end of the direct current output loop is increased to be larger than the third threshold voltage, the positive fault alarm branch is conducted, and a second alarm signal is output. Therefore, when the direct current output loop of the relay protection test power supply screen has a direct current fault, the invention can timely send out an alarm prompt to remind a worker to check and solve the fault, so that the relay protection test power supply screen can be used more safely in the equipment debugging process, and the risk of damaging the relay protection device is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a monitoring circuit of a dc output circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a positive monitoring branch 110 in a monitoring circuit of a dc output circuit according to another embodiment of the present invention;
fig. 3 is a schematic diagram of a negative monitoring branch 120 in a monitoring circuit of a dc output circuit according to another embodiment of the present invention;
fig. 4 is a schematic diagram of a negative fault alarm branch 130 in a monitoring circuit of a dc output circuit according to another embodiment of the present invention;
fig. 5 is a schematic diagram of a positive fault alarm branch 140 in a monitoring circuit of a dc output circuit according to another embodiment of the present invention;
fig. 6 is a schematic diagram of a monitoring circuit of a dc output circuit according to another embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
In this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In order to solve the problem that a direct current output loop lacks a direct current fault monitoring circuit, an embodiment of the present invention provides a monitoring circuit of a direct current output loop, which is suitable for a relay protection test power supply screen, as shown in fig. 1, and the specific structure includes: a positive monitoring branch 110, a negative monitoring branch 120, a negative fault alarm branch 130, and a positive fault alarm branch 140; wherein:
the positive electrode of the input end of the positive electrode monitoring branch circuit 110 is connected with the positive output end of the direct current output loop, and the negative electrode of the input end of the positive electrode monitoring branch circuit 110 is grounded; the negative electrode of the input end of the negative electrode monitoring branch 120 is connected with the negative output end of the direct current output loop, and the positive electrode of the input end of the negative electrode monitoring branch 120 is grounded.
The positive electrode of the input end of the negative fault alarm branch 130 is connected with the positive electrode of the power supply, and the negative electrode of the input end of the negative fault alarm branch 130 is connected with the negative electrode of the power supply; the positive pole of the input end of the positive fault alarm branch 140 is connected with the positive pole of the power supply, and the negative pole of the input end of the positive fault alarm branch 140 is connected with the negative pole of the power supply.
It should be noted that, the power sources connected to the negative fault alarm branch 130 and the positive fault alarm branch 140 may be additional power sources independent of the dc output circuit; in this case, the monitoring circuit of the dc output circuit provided in this embodiment needs to set up not only the ports connected to the positive and negative output ends of the dc output circuit, but also corresponding power connection ports for the negative fault alarm branch 130 and the positive fault alarm branch 140. Alternatively, the dc output loop may be directly used as a power source connected to the negative fault alarm branch 130 and the positive fault alarm branch 140, so as to supply power to both; at this time, the monitoring circuit of the dc output circuit provided in this embodiment only needs to set a port connected to the positive and negative output ends of the dc output circuit. The actual setting of the power supply can depend on the specific application environment, and is within the protection scope of the application.
The first control end of the negative fault alarm branch 130 and the first control end of the positive fault alarm branch 140 are both connected with the output end of the positive monitoring branch 110; the second control terminal of the negative fault alert leg 130 and the second control terminal of the positive fault alert leg 140 are both connected to the output terminal of the negative monitoring leg 120.
The specific working principle is as follows:
the positive monitoring branch 110 and the negative monitoring branch 120 respectively monitor the direct current voltage output by the positive output end and the direct current voltage output by the negative output end of the direct current output loop in real time, and when the positive monitoring branch 110 monitors that the direct current voltage output by the positive output end of the direct current output loop is increased to be greater than a first threshold voltage, the output end of the positive monitoring branch 110 outputs a first control signal V1; when the first monitoring circuit 110 monitors that the dc voltage output by the positive output terminal of the dc output circuit drops to be less than the second threshold voltage, the output terminal thereof outputs the second control signal V2.
The first threshold voltage is 80% of rated voltage of the positive output end of the direct current output loop; the second threshold voltage is 10% of the rated voltage of the positive output end of the direct current output loop.
When the negative electrode monitoring branch 120 monitors that the direct current voltage output by the negative output end of the direct current output loop rises to be greater than a third threshold voltage, the output end of the negative electrode monitoring branch outputs a third control signal V3; when the negative electrode monitoring branch 120 monitors that the dc voltage at the negative output end of the dc output circuit drops to be less than the fourth threshold voltage, the output end thereof outputs the fourth control signal V4.
The third threshold voltage is 80% of the rated voltage of the negative output end of the direct current output loop; the fourth threshold voltage is 10% of the rated voltage of the negative output end of the direct current output loop.
When the first control end of the negative fault alarm branch 130 receives the first control signal V1 and the second control end thereof receives the fourth control signal V4, the negative fault alarm branch 130 outputs the first alarm signal.
When the first control end of the positive fault alarm branch 140 receives the second control signal V2 and the second control end thereof receives the third control signal V3, the positive fault alarm branch 140 outputs the second alarm signal.
Compared with the prior art, the invention monitors the direct current voltage output by the positive output end and the negative output end of the direct current output loop through the positive monitoring branch and the negative monitoring branch respectively, and when the direct current voltage output by the positive output end of the direct current output loop is increased to be larger than a first threshold voltage and the direct current voltage output by the negative output end of the direct current output loop is decreased to be smaller than a fourth threshold voltage, the negative fault alarm branch is conducted to output a first alarm signal; when the direct current voltage output by the positive output end of the direct current output loop is reduced to be smaller than the second threshold voltage, and the direct current voltage output by the negative output end of the direct current output loop is increased to be larger than the third threshold voltage, the positive fault alarm branch is conducted, and a second alarm signal is output. Therefore, when the direct current output loop of the relay protection test power supply screen has a direct current fault, the invention can timely send out an alarm prompt to remind a worker to check and solve the fault, so that the relay protection test power supply screen can be used more safely in the equipment debugging process, and the risk of damaging the relay protection device is reduced.
Optionally, as shown in fig. 2, in another embodiment of the present invention, an implementation manner of the positive electrode monitoring branch 110 includes: a first switch S1, a first resistor R1 and a coil 111 of a first dc relay; wherein:
the first resistor R1 is connected with the coil 111 of the first direct current relay in parallel, and one end of the parallel connection is connected with one end of the first switch S1; the other end of the parallel connection is used as the negative electrode of the input end of the positive electrode monitoring branch 110.
The other end of the first switch S1 is used as the positive electrode of the input end of the positive electrode monitoring branch 110; the control signal output of the coil 111 of the first dc relay serves as the output of the positive monitoring branch 110.
Optionally, the first resistor R1 is a resistor with a resistance value of 20 kilo ohms.
The specific working principle is as follows:
the first switch S1 is closed, the positive monitoring branch 110 is turned on, current flows through the first resistor R1, voltage division is generated on the first resistor R1, and the coil 111 of the first direct current relay is connected with the first resistor R1 in parallel, so that the coil 111 of the first direct current relay monitors voltages at two ends of the first resistor R1; because one end of the first resistor R1 is connected to the positive output end of the dc output loop through the first switch S1, and the other end of the first resistor R1 is grounded, the coil 111 of the first dc relay monitors the voltage at two ends of the first resistor R1, which is equivalent to monitoring the dc voltage output from the positive output end of the dc output loop.
When the coil 111 of the first direct current relay monitors that the direct current voltage output by the positive output end of the direct current output loop rises to be greater than a first threshold voltage, the control signal output end of the coil 111 of the first direct current relay outputs a first control signal V1; when the coil 111 of the first dc relay monitors that the dc voltage output from the positive output terminal of the dc output circuit drops to be less than the second threshold voltage, the control signal output terminal of the coil 111 of the first dc relay outputs the second control signal V2.
In addition, after the negative fault alarm branch 130 outputs the first alarm signal, the worker may reset the coil 111 of the first dc relay by turning off the first switch S1, thereby breaking the negative fault alarm branch 130 and stopping outputting the first alarm signal; and, after the maintenance of the staff is finished, the first switch S1 can be closed to check whether the dc output circuit has a dc fault, if the first switch S1 is closed, the negative fault alarm branch 130 outputs the first alarm signal, the dc output circuit still has a dc fault, and if the first switch S1 is closed, the negative fault alarm branch 130 does not alarm, and the dc output circuit does not have a dc fault.
When the first switch S1 is opened or closed, the coil 111 of the first dc relay generates a self-inductance phenomenon, and a self-inductance electromotive force is generated, and the coil 111 of the first dc relay with the self-inductance electromotive force corresponds to a power source and affects other electronic devices. The first resistor R1 connected in parallel with the coil 111 of the first dc relay can consume the self-induced electromotive force generated by the coil 111 of the first dc relay when the first switch S1 is opened or closed, so as to achieve the purpose of protecting other electronic devices.
It should be noted that, in this embodiment, only one implementation manner of the positive electrode monitoring branch 110 is provided, and in practical application, the positive electrode monitoring branch 110 may also be implemented by using a comparator, or may also be a unit or an independent module formed by other electrical elements, so long as other implementations of the positive electrode monitoring branch 110 that can achieve the same purpose are within the scope of the present invention.
The rest of the structure and the working principle are the same as those of the above embodiment, and will not be repeated here.
Optionally, as shown in fig. 3, in another embodiment of the present invention, an implementation manner of the negative electrode monitoring branch 120 includes: a second switch S2, a second resistor R2 and a coil 121 of a second dc relay; wherein:
the second resistor R2 is connected with the coil 121 of the second direct current relay in parallel, and one end of the parallel connection is connected with one end of the second switch S2; the other end of the parallel connection serves as the positive electrode of the input end of the negative monitoring branch 120.
The other end of the second switch S2 is used as the input end negative electrode of the negative electrode monitoring branch 120; the control signal output of the coil 121 of the second dc relay serves as the output of the negative monitoring branch 120.
The second resistor R2 is a resistor having a resistance value of 20 kilo ohms.
Specific working principle:
closing the second switch S2, turning on the negative electrode detection branch 110, and allowing current to flow through the second resistor R2 to generate voltage division on the second resistor R2, wherein the coil 121 of the second direct current relay is connected in parallel with the second resistor R2, so that the coil 121 of the second direct current relay monitors the voltage across the second resistor R2; because one end of the second resistor R2 is connected to the negative output end of the dc output loop through the second switch S2, and the other end of the second resistor R2 is grounded, the coil 121 of the second dc relay monitors the voltage across the first resistor R1, which is equivalent to monitoring the dc voltage output from the negative output end of the dc output loop.
When the coil 121 of the second direct current relay monitors that the direct current voltage output by the negative output end of the direct current output loop rises to be greater than a third threshold voltage, the control signal output end of the coil 121 of the second direct current relay outputs a third control signal V3; when the coil 121 of the second dc relay monitors that the dc voltage output from the negative output terminal of the dc output circuit drops to be less than the fourth threshold voltage, the control signal output terminal of the coil 121 of the second dc relay outputs the fourth control signal V4.
In addition, after the positive fault alarm branch 140 outputs the second alarm signal, the worker may reset the coil 121 of the second dc relay by turning off the second switch S2, thereby breaking the positive fault alarm branch 140 and stopping outputting the second alarm signal; and, after the maintenance of the staff is finished, the second switch S2 can be closed to check whether the dc output circuit has a dc fault, if the second switch S2 is closed, the positive fault alarm branch 140 outputs a second alarm signal, the dc output circuit still has a dc fault, and if the second switch S2 is closed, the positive fault alarm branch 140 does not alarm, and the dc output circuit does not have a dc fault.
When the second switch S2 is turned off or turned on, the coil 121 of the second dc relay generates a self-inductance phenomenon, and a self-inductance electromotive force is generated, and the coil 121 of the second dc relay with the self-inductance electromotive force corresponds to a power source and affects other electronic devices. The second resistor R2 connected in parallel with the coil 121 of the second dc relay can consume the self-induced electromotive force generated by the coil 121 of the second dc relay when the second switch S2 is opened or closed, so as to achieve the purpose of protecting other electronic devices.
It should be noted that this embodiment only provides one implementation of the negative monitoring branch 120, and another implementation of the negative monitoring branch 120 may be a comparator, or may be a unit or a separate module formed by other electrical elements, so long as other implementations of the negative monitoring branch 120 that can achieve the same purpose are within the scope of the present invention.
The rest of the structure and the working principle are the same as those of the above embodiment, and will not be repeated here.
Optionally, as shown in fig. 4, in another embodiment of the present invention, an implementation manner of the negative fault alarm branch 130 includes: a normally open contact 131 of the first direct current relay, a normally closed contact 132 of the second direct current relay, and a first light source alarm unit 133; wherein:
one end of a normally open contact 131 of the first direct current relay is used as an input end positive electrode of the negative fault alarm branch 130, the other end of the normally open contact 131 of the first direct current relay is connected with one end of a first light source alarm unit 133 through a normally closed contact 132 of the second direct current relay, and the other end of the first light source alarm unit 133 is used as an input end negative electrode of the negative fault alarm branch; or, one end of the normally open contact 131 of the first direct current relay is used as the positive electrode of the input end of the negative fault alarm branch 130, the other end of the normally open contact 131 of the first direct current relay is connected with one end of the normally closed contact 132 of the second direct current relay through the first light source alarm unit 133, and the other end of the normally closed contact 132 of the second direct current relay is used as the negative electrode of the input end of the negative fault alarm branch 130.
It should be noted that, the above connection method is a preferred method, and in practical application, the normally open contact 131 of the first dc relay, the normally closed contact 132 of the second dc relay, and the first light source alarm unit 133 only need to be connected in series to realize the function of the negative fault alarm branch 130, so that no matter what order the three are connected in series, the function is within the protection scope of the present invention.
The control end of the normally open contact 131 of the first direct current relay is used as a first control end of the negative fault alarm branch 130; the control terminal of the normally closed contact 132 of the second dc relay serves as the second control terminal of the negative fault warning branch 130.
The specific working principle is as follows:
when the control end of the normally open contact 131 of the first direct current relay receives a first control signal V1 output by the control signal output end of the positive monitoring branch 110, the control end is closed; when the control end of the normally closed contact 132 of the second dc relay receives the fourth control signal V4 output from the control signal output end of the negative electrode monitoring branch 120, it closes itself.
When both the normally open contact 131 of the first dc relay and the normally closed contact 132 of the second dc relay are closed, the first light source alarm unit 133 emits a first light source alarm signal.
It should be noted that, the implementation form of the first light source alarm unit 133 may be an alarm, or may be other independent electronic devices or a unit composed of discrete devices, and other implementation forms are all within the scope of the present invention as long as the same purpose can be achieved.
Optionally, the negative fault alert leg 130 further includes a first acoustic source alert unit 134; the first sound source alarm unit 134 is connected in parallel with the first light source alarm unit 133; when the normally open contact 131 of the first direct current relay and the normally closed contact 132 of the second direct current relay are both closed, the first sound source alarm unit 134 is conducted to send out a first sound source alarm signal, so that the problem that the light source alarm signal is not easy to find out is solved, and when the direct current output loop has a direct current fault, workers can be effectively reminded at the first time, and equipment damage is avoided.
It should be noted that, the implementation form of the first sound source alarm unit 134 may be a loudspeaker, an intelligent sound box, or other independent electronic devices or modules composed of discrete devices, so long as other implementation forms capable of achieving the same purpose are all within the scope of the present invention.
It should be noted that this embodiment only provides one implementation of the negative fault alarm branch 130, and another implementation of the negative fault alarm branch 130 may be a switching tube, or may be a unit or a separate module formed by other electrical elements, so long as other implementations of the negative fault alarm branch 130 that can achieve the same purpose are within the scope of the present invention.
The rest of the structure and the working principle are the same as those of the above embodiment, and will not be repeated here.
Optionally, as shown in fig. 5, in another embodiment of the present invention, an implementation of the positive fault alarm branch 140 includes: a normally closed contact 141 of the first direct current relay, a normally open contact 142 of the second direct current relay, and a second light source alarm unit 143; wherein:
one end of a normally open contact 142 of the second direct current relay is used as an input end positive electrode of the positive fault alarm branch 140, the other end of the normally open contact 142 of the second direct current relay is connected with one end of a second light source alarm unit 143 through a normally closed contact 141 of the first direct current relay, and the other end of the second light source alarm unit 143 is used as an input end negative electrode of the positive fault alarm branch 140; or, one end of the normally open contact 142 of the second direct current relay is used as the positive electrode of the input end of the positive fault alarm branch 140, the other end of the normally open contact 142 of the second direct current relay is connected with one end of the normally closed contact 141 of the first direct current relay through the second light source alarm unit 143, and the other end of the normally closed contact 141 of the first direct current collector is used as the negative electrode of the input end of the positive fault alarm branch 140.
It should be noted that, the above connection method is a preferred method, and in practical application, the normally closed contact 141 of the first dc relay, the normally open contact 142 of the second dc relay, and the second light source alarm unit 143 only need to be connected in series to realize the function of the negative fault alarm branch 130, so that no matter what order the three are connected in series, the function is within the protection scope of the present invention.
The control end of the normally closed contact 141 of the first dc relay serves as a first control end of the positive fault alarm branch 140; the control terminal of the normally open contact 142 of the second dc relay serves as the second control terminal of the positive fault warning branch 140.
The specific working principle is as follows:
when the control end of the normally closed contact 141 of the first direct current relay receives a second control signal output by the control signal output end of the positive monitoring branch 110, the control end is closed; when the control end of the normally open contact 142 of the second dc relay receives the third control signal output from the control signal output end of the negative monitoring branch 120, it closes itself.
The second light source alarm unit 143 emits a second light source alarm signal when both the normally closed contact 141 of the first dc relay and the normally open contact 142 of the second dc relay are closed.
It should be noted that, the implementation form of the second light source alarm unit 143 may be an alarm, or may be other independent electronic devices or units composed of discrete devices, and other implementation forms are all within the scope of the present invention as long as the same purpose can be achieved.
Optionally, the positive fault alert leg 140 further includes a second acoustic source alert unit 144; the second sound source alarm unit 144 is connected in parallel with the second light source alarm unit 143; when the normally closed contact 141 of the first direct current relay and the normally open contact 142 of the second direct current relay are both closed, the second sound source alarm unit 144 is conducted and sends out a second sound source alarm signal, so that the problem that the light source alarm signal is not easy to find is solved, and when the direct current output loop has a direct current fault, workers can be effectively reminded at the first time, and equipment damage is avoided.
It should be noted that, the second sound source alarm unit 144 may be implemented in a horn, an intelligent sound box, or other independent electronic devices or modules composed of discrete devices, so long as other implementation forms capable of achieving the same purpose are all within the scope of the present invention.
It should be noted that this embodiment only provides one implementation of the positive fault alarm branch 140, and another implementation of the positive fault alarm branch 140 may be a switching tube, or may be a unit or a separate module formed by other electrical elements, so long as other implementations of the positive fault alarm branch 140 that can achieve the same purpose are within the scope of the present invention.
The rest of the structure and the working principle are the same as those of the above embodiment, and will not be repeated here.
Optionally, as shown in fig. 6 (only two dc output branches are taken as an example in the drawing), in another embodiment of the present invention, the monitoring circuit of the dc output loop further includes: n dc output branches; wherein:
the positive input end of the direct current output branch is connected with the positive output end of the direct current output loop, and the negative input end of the direct current output branch is connected with the negative output end of the direct current output loop.
The positive output end of the direct current output branch is connected with one end of the required equipment, and the negative output end of the direct current output branch is connected with the other end of the required equipment; wherein N is a non-negative integer.
Optionally, the dc output branch includes an air switch disposed between the positive input and the positive output of the dc output branch, or includes an air switch disposed between the negative input and the negative output of the dc output branch.
The number of N is selected according to the actual need.
When the DC output branch circuit is used, a load is connected between two output ends of the DC output branch circuit, and when the air switch is closed, current passes through the load; if the direct current output branch circuit fails, the air switch can automatically cut off power to protect the load and prevent the load from being damaged.
The rest of the structure and the working principle are the same as those of the above embodiment, and will not be repeated here.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides a monitoring circuit of direct current output return circuit, is applicable to relay protection test power supply screen, its characterized in that includes: the system comprises an anode monitoring branch, a cathode monitoring branch, a negative fault alarm branch and a positive fault alarm branch; wherein:
the positive electrode monitoring branch is used for monitoring the direct current voltage output by the positive output end of the direct current output loop, outputting a first control signal when the direct current voltage output by the positive output end rises to be larger than a first threshold voltage, and outputting a second control signal when the direct current voltage output by the positive output end drops to be smaller than a second threshold voltage;
the negative electrode monitoring branch is used for monitoring the direct current voltage output by the negative output end of the direct current output loop, outputting a third control signal when the direct current voltage output by the negative output end rises to be greater than a third threshold voltage, and outputting a fourth control signal when the direct current voltage output by the negative output end falls to be less than a fourth threshold voltage;
the negative fault alarm branch is used for outputting a first alarm signal when receiving the first control signal and the fourth control signal;
the positive fault alarm branch is used for outputting a second alarm signal when the second control signal and the third control signal are received.
2. The monitoring circuit of a dc output loop according to claim 1, wherein the positive monitoring branch comprises: a first switch, a first resistor and a coil of a first direct current relay; wherein:
the first resistor is connected with the coil of the first direct current relay in parallel, and one end of the parallel connection is connected with one end of the first switch; the other end of the parallel connection is grounded;
the other end of the first switch is connected with the positive output end of the direct current output loop;
and a control signal output end of a coil of the first direct current relay outputs the first control signal or the second control signal.
3. The monitoring circuit of a dc output loop of claim 1, wherein the negative monitoring branch comprises: a second switch, a second resistor and a coil of a second direct current relay; wherein:
the second resistor is connected with the coil of the second direct current relay in parallel, and one end of the parallel connection is connected with one end of the second switch; the other end of the parallel connection is grounded;
the other end of the second switch is connected with the negative output end of the direct current output loop;
and a control signal output end of a coil of the second direct current relay outputs the third control signal or the fourth control signal.
4. The monitoring circuit of a dc output loop according to claim 1, wherein the negative fault alarm branch comprises: a normally open contact of the first direct current relay, a normally closed contact of the second direct current relay and a first light source alarm unit; wherein:
one end of a normally open contact of the first direct current relay is connected with a positive electrode of a power supply, and the other end of the normally open contact of the first direct current relay is connected with a negative electrode of the power supply sequentially through a normally closed contact of the second direct current relay and the first light source alarm unit; or one end of the normally open contact of the first direct current relay is connected with the positive electrode of the power supply, and the other end of the normally open contact of the first direct current relay is connected with the negative electrode of the power supply sequentially through the first light source alarm unit and the normally closed contact of the second direct current relay;
the control end of the normally open contact of the first direct current relay receives the first control signal or the second control signal; and a control end of the normally closed contact of the second direct current relay receives the third control signal or the fourth control signal.
5. The monitoring circuit of a dc output loop of claim 4, wherein the negative fault alarm branch further comprises: and the first sound source alarm unit is connected with the first light source alarm unit in parallel.
6. The monitoring circuit of a dc output loop according to claim 1, wherein the positive fault alarm branch comprises: a normally closed contact of the first direct current relay, a normally open contact of the second direct current relay and a second light source alarm unit; wherein:
one end of a normally open contact of the second direct current relay is connected with the positive electrode of the power supply, and the other end of the normally open contact of the second direct current relay is connected with the negative electrode of the power supply sequentially through the normally closed contact of the first direct current relay and the second light source alarm unit; or one end of the normally open contact of the second direct current relay is connected with the positive electrode of the power supply, and the other end of the normally open contact of the second direct current relay is connected with the negative electrode of the power supply sequentially through the second light source alarm unit and the normally closed contact of the first direct current relay;
the control end of the normally closed contact of the first direct current relay receives the first control signal or the second control signal; and a control end of a normally open contact of the second direct current relay receives the third control signal or the fourth control signal.
7. The monitoring circuit of a dc output loop of claim 6, wherein the positive fault alert leg further comprises: and the second sound source alarm unit is connected with the second light source alarm unit in parallel.
8. The monitoring circuit of any one of claims 4-7, wherein a positive output terminal of the dc output circuit is a positive electrode of the power supply and a negative output terminal of the dc output circuit is a negative electrode of the power supply.
9. The monitoring circuit of a dc output loop according to any one of claims 1 to 7, further comprising: n dc output branches; wherein:
the positive input end of the direct current output branch is connected with the positive output end of the direct current output loop, and the negative input end of the direct current output branch is connected with the negative output end of the direct current output loop;
the positive output end of the direct current output branch is connected with one end of the load, and the negative output end of the direct current output branch is connected with the other end of the load;
wherein N is a non-negative integer.
10. The monitoring circuit of a dc output loop of claim 9, wherein the dc output branch comprises: the air switch is arranged between the positive input end and the positive output end of the direct current output branch;
the direct current output branch circuit comprises: and the air switch is arranged between the negative input end and the negative output end of the direct current output branch.
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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 |
|---|
| 基于差流检测法的分布式直流接地巡检系统;黄海宏等;《电子测量与仪器学报》;第第23卷卷(第第11期期);第36-41页 * |
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