CN113114217A - Relay auxiliary contact monitoring device and switch control system - Google Patents
Relay auxiliary contact monitoring device and switch control system Download PDFInfo
- Publication number
- CN113114217A CN113114217A CN202110424303.6A CN202110424303A CN113114217A CN 113114217 A CN113114217 A CN 113114217A CN 202110424303 A CN202110424303 A CN 202110424303A CN 113114217 A CN113114217 A CN 113114217A
- Authority
- CN
- China
- Prior art keywords
- relay
- auxiliary contact
- module
- monitoring device
- electrically connected
- 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.)
- Pending
Links
- 238000012806 monitoring device Methods 0.000 title claims abstract description 55
- 238000005070 sampling Methods 0.000 claims abstract description 49
- 238000004891 communication Methods 0.000 claims abstract description 30
- 238000012423 maintenance Methods 0.000 claims abstract description 28
- 238000012545 processing Methods 0.000 claims abstract description 24
- 238000012544 monitoring process Methods 0.000 claims abstract description 12
- 239000003990 capacitor Substances 0.000 claims description 18
- 238000001914 filtration Methods 0.000 claims description 7
- 230000000007 visual effect Effects 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 16
- 238000005259 measurement Methods 0.000 description 6
- 230000007547 defect Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 239000003086 colorant Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000009365 direct transmission Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/0175—Coupling arrangements; Interface arrangements
- H03K19/0185—Coupling arrangements; Interface arrangements using field effect transistors only
Landscapes
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Physics & Mathematics (AREA)
- Computing Systems (AREA)
- General Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention discloses a relay auxiliary contact monitoring device and a disconnecting link control system. The relay auxiliary contact monitoring device comprises an alternating current sampling module, wherein the alternating current sampling module is connected with one end, far away from a power supply side, of an auxiliary contact of a relay; the alternating current sampling module is used for collecting the voltage of one end, far away from the power supply side, of the auxiliary contact of the relay; the digital operation module is connected with the alternating current sampling module and converts the voltage signal output by the alternating current sampling module into a digital signal; the communication processing module is respectively connected with the digital operation module and the human-computer interface screen, the communication processing module transmits the digital signals to the human-computer interface screen, and the human-computer interface screen is used for displaying the conduction state of the auxiliary contact of the relay according to the digital signals. The technical scheme provided by the invention realizes the visual monitoring of the conduction state of the auxiliary contact, and reduces the difficulty and cost of operation and maintenance of the control loop of the disconnecting link.
Description
Technical Field
The embodiment of the invention relates to the technical field of power control, in particular to a relay auxiliary contact monitoring device and a disconnecting link control system.
Background
Along with the increase of power demand, more and more power station construction investment and the continuous expansion of power grid scale, numerous relays and auxiliary contacts thereof are arranged on a disconnecting link control loop for controlling the operation of a disconnecting link and a motor loop for driving the disconnecting link to be switched on or off, when one relay auxiliary contact in the loop is damaged, the whole control loop is in fault, the disconnecting link cannot control the switching-on and the switching-off, and the existing disconnecting link control loop has operation and maintenance difficulty and higher operation and maintenance cost.
Disclosure of Invention
The embodiment of the invention provides a relay auxiliary contact monitoring device and a disconnecting link control system, and aims to solve the problems of operation and maintenance difficulty and high operation and maintenance cost of the existing disconnecting link control loop.
In order to realize the technical problem, the invention adopts the following technical scheme:
in a first aspect, an embodiment of the present invention provides a relay auxiliary contact monitoring device, including:
the alternating current sampling module is connected with one end, far away from the power supply side, of the auxiliary contact of the relay; the alternating current sampling module is used for collecting the voltage of one end, far away from the power supply side, of the auxiliary contact of the relay;
the digital operation module is connected with the alternating current sampling module and is used for converting the voltage signal output by the alternating current sampling module into a digital signal;
the communication processing module is respectively connected with the digital operation module and the human-computer interface screen, the communication processing module is used for transmitting digital signals to the human-computer interface screen, and the human-computer interface screen is used for displaying the conduction state of an auxiliary contact of the relay according to the digital signals.
Optionally, the ac sampling module includes a sample-and-hold circuit and a filter circuit;
the input end of the filter circuit is electrically connected with the input end of the alternating current sampling module; the filter circuit is used for filtering noise voltage of power frequency;
the input end of the sampling hold circuit is electrically connected with the output end of the filter circuit; the output end of the sampling and holding circuit is electrically connected with the output end of the alternating current sampling module, and the sampling and holding circuit is used for holding the collected voltage.
Optionally, the sample-and-hold circuit comprises: the circuit comprises a first operational amplifier, a second operational amplifier, a first resistor, a second resistor, a third resistor, a first capacitor and a second capacitor;
the positive phase input end of the first operational amplifier is electrically connected with the output end of the filter circuit, the inverting input end of the first operational amplifier is electrically connected with the first end of the second resistor and the first end of the third resistor, the output end of the first operational amplifier is electrically connected with the positive phase input end of the second operational amplifier and the first end of the second capacitor through the first resistor, and the second end of the second capacitor is grounded; the inverting input end of the second operational amplifier is electrically connected with the second end of the second resistor and the first end of the first capacitor; the output end of the second operational amplifier is electrically connected with the second end of the third resistor and the second end of the first capacitor.
Optionally, the filter circuit includes: an RC filtering module and a voltage follower, wherein,
the input end of the RC filter module is electrically connected with the input end of the filter circuit, and the output end of the RC filter module is connected with the input end of the voltage follower.
Optionally, the digital operation module includes: a comparator and a diode;
the positive phase input end of the comparator is electrically connected with the output end of the alternating current sampling module, and the negative phase input end of the comparator is used for inputting reference voltage; the output end of the comparator is electrically connected with the anode of the diode, and the cathode of the diode is electrically connected with the output end of the digital operation module.
Optionally, the relay auxiliary contact monitoring device further includes: and the station end maintenance substation module is in communication connection with the communication processing module and is used for acquiring digital signals through the communication processing module.
Optionally, the relay auxiliary contact monitoring device further includes: and the scheduling and maintaining main station module is in communication connection with the station end maintaining sub-station module and is used for acquiring the digital signals through the station end maintaining sub-station module.
In a second aspect, an embodiment of the present invention provides a switch control system, including any relay auxiliary contact monitoring device in the first aspect, a switch control loop, and a switch;
the knife switch control loop is used for controlling the on-off of the knife switch;
the knife switch control loop comprises a first relay, and the first relay comprises an auxiliary contact;
the relay auxiliary contact monitoring device is used for monitoring the conduction state of the auxiliary contact of the first relay.
Optionally, the knife switch control loop further includes: a motor and a motor control circuit;
the disconnecting link control circuit controls the motor through the motor control circuit, and the motor acts to drive the disconnecting link to be switched on or off;
the motor control circuit comprises a second relay, and the second relay comprises an auxiliary contact;
the relay auxiliary contact monitoring device is also used for monitoring the conduction state of the auxiliary contact of the second relay.
Optionally, the motor control circuit controls the motor to rotate forwards or backwards;
when the motor rotates forwards, the disconnecting link is driven to be closed; when the motor rotates reversely, the driving disconnecting link is disconnected.
According to the relay auxiliary contact monitoring device provided by the embodiment of the invention, the voltage signal of one end, far away from the power supply side, of the auxiliary contact of the relay is acquired through the alternating current sampling module, the acquired voltage signal is output to the digital operation module, the voltage signal output by the alternating current sampling module is converted into the digital signal through the digital operation module, the digital signal is transmitted to the man-machine interface screen through the communication processing module, the conduction state of the auxiliary contact of the relay is displayed on the man-machine interface screen, the visual monitoring on the conduction state of the auxiliary contact is realized, the operation and maintenance difficulty and the operation and maintenance cost of the control circuit of the disconnecting link are reduced, and the problems of high operation and maintenance difficulty and high operation and maintenance cost of the existing disconnecting link control circuit are solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a relay auxiliary contact monitoring device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another relay auxiliary contact monitoring device provided by the embodiment of the invention;
fig. 3 is a schematic structural diagram of another relay auxiliary contact monitoring device provided by the embodiment of the invention;
fig. 4 is a schematic structural diagram of another relay auxiliary contact monitoring device provided by the embodiment of the invention;
fig. 5 is a schematic structural diagram of another relay auxiliary contact monitoring device provided by the embodiment of the invention;
fig. 6 is a schematic structural diagram of another relay auxiliary contact monitoring device provided by the embodiment of the invention;
fig. 7 is a schematic structural diagram of a disconnecting link control system according to an embodiment of the present invention;
fig. 8 is a schematic display interface diagram of a human-machine interface screen of a relay auxiliary contact monitoring device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Based on the above technical problem, the present embodiment proposes the following solutions:
fig. 1 is a schematic structural diagram of a relay auxiliary contact monitoring device according to an embodiment of the present invention. Referring to fig. 1, an auxiliary relay contact monitoring device 100 provided by the embodiment of the present invention includes an ac sampling module 1, a digital operation module 2, a communication processing module 3, and a human-computer interface screen 4, where the ac sampling module 1 is connected to one end of an auxiliary relay contact far from a power supply side; the alternating current sampling module 1 is used for collecting the voltage of one end of an auxiliary contact of the relay, which is far away from the power supply side; the digital operation module 2 is connected with the alternating current sampling module 1, and the digital operation module 2 is used for converting the voltage signal output by the alternating current sampling module 1 into a digital signal; the communication processing module 3 is respectively connected with the digital operation module 2 and the man-machine interface screen 4, the communication processing module 3 is used for transmitting digital signals to the man-machine interface screen 4, and the man-machine interface screen 4 is used for displaying the conduction state of the auxiliary contact of the relay according to the digital signals.
Specifically, the auxiliary contacts of the relay include a normally open contact and a normally closed contact, the normally open contact does not have a voltage signal at the end far away from the power supply side, that is, the voltage signal is equal to zero, and when the normally open contact is closed, the normally open contact has a voltage signal at the end far away from the power supply side. The normally closed contact has a voltage signal at one end far away from the power supply side, and when the normally closed contact is opened, the normally closed contact has no voltage signal at one end far away from the power supply side. The alternating current sampling module 1 collects a voltage signal of one end, far away from the power supply side, of an auxiliary contact of the relay, and outputs the collected voltage signal to the digital operation module 2, and the digital operation module 2 converts the voltage signal output by the alternating current sampling module 1 into a digital signal; when the digital signal is at low level, it shows that there is no voltage signal at the end of the auxiliary contact of the relay far from the power supply side, indicating that the auxiliary contact is disconnected.
The communication processing module 3 communicates with the man-machine interface screen 4 through MMI communication, and the functions of local monitoring and communication of the relay auxiliary contact monitoring device are achieved. The man-machine interface screen 4 can realize man-machine interaction on the spot, and simple structure can include the page turning key, and through turning the page turning key up and down, look over information such as the voltage of the node that awaits measuring on each auxiliary contact of relay. The communication processing module 3 transmits the digital signal to the man-machine interface screen 4, and the conduction state of the auxiliary contact of the relay is displayed on the man-machine interface screen 4, so that the visual monitoring of the conduction state of the auxiliary contact is realized, and the difficulty and the operation and maintenance cost of the control circuit of the disconnecting link are reduced.
The relay auxiliary contact monitoring devices that this embodiment provided gathers the voltage signal of the one end of keeping away from the power side of the auxiliary contact of relay through exchanging sampling module, and the voltage signal who will gather exports to digital operation module, the voltage signal who will exchange sampling module output through digital operation module converts digital signal into, and transmit digital signal to man-machine interface screen through communication processing module, show the conducting state of the auxiliary contact of relay on man-machine interface screen, the visual monitoring to the conducting state of auxiliary contact has been realized, the degree of difficulty and the fortune dimension cost of the control circuit fortune dimension to the switch have been reduced, the problem that current switch control circuit exists the fortune dimension degree of difficulty and fortune dimension cost is higher has been solved.
Optionally, fig. 2 is a schematic structural diagram of another relay auxiliary contact monitoring device provided in the embodiment of the present invention. On the basis of the above embodiment, referring to fig. 2, the ac sampling module 1 of the relay auxiliary contact monitoring device 100 provided in this embodiment includes a sample-and-hold circuit 11 and a filter circuit 12; the input end 121 of the filter circuit 12 is electrically connected with the input end of the alternating current sampling module 1; the filter circuit 12 is used for filtering noise voltage of power frequency; the input end 111 of the sample hold circuit 11 is electrically connected to the output end 122 of the filter circuit 12; the output end 112 of the sample-and-hold circuit 11 is electrically connected to the output end of the ac sampling module 1, and the sample-and-hold circuit 11 is used for holding the collected voltage.
Specifically, the filter circuit 12 may be a band-pass filter circuit, such as a second-order RC filter circuit, and the second-order RC filter may filter a noise voltage other than the power frequency, so as to ensure the correctness and effectiveness of sampling. The sample hold circuit 11 can hold the collected voltage, so that the sample hold circuit 11 can hold the collected voltage of the node to be tested of the auxiliary contact of the relay for as long as possible, and the digital module can process the collected voltage signal conveniently.
Optionally, fig. 3 is a schematic structural diagram of another relay auxiliary contact monitoring device provided in the embodiment of the present invention. On the basis of the above embodiment, referring to fig. 3, the sample-and-hold circuit 11 of the relay auxiliary contact monitoring device 100 provided in this embodiment includes a first operational amplifier 113, a second operational amplifier 114, a first resistor 115, a second resistor 116, a third resistor 117, a first capacitor 118, and a second capacitor 119; the non-inverting input terminal of the first operational amplifier 113 is electrically connected to the output terminal 122 of the filter circuit 12, the inverting input terminal of the first operational amplifier 113 is electrically connected to the first terminal of the second resistor 116 and the first terminal of the third resistor 117, the output terminal of the first operational amplifier 113 is electrically connected to the non-inverting input terminal of the second operational amplifier 114 and the first terminal of the second capacitor 119 through the first resistor 115, and the second terminal of the second capacitor 119 is grounded; an inverting input terminal of the second operational amplifier 114 is electrically connected to a second terminal of the second resistor 116 and a first terminal of the first capacitor 118; the output terminal of the second operational amplifier 114 is electrically connected to the second terminal of the third resistor 117 and the second terminal of the first capacitor 118.
Specifically, referring to fig. 3, after the ac voltage signal is input from the input end 121 of the filter circuit 12 through the ground measurement, the ac voltage signal first passes through the filter circuit 12, the voltage fundamental wave near 50Hz in the ac voltage signal is passed through, and the harmonics of other frequencies are filtered; and secondly, the sampling and holding circuit 11 holds the sampling input signal input to the input end 111 of the sampling and holding circuit 11 at a certain voltage value, more time is won for the processing of the digital operation module 2 and the communication processing module 3, and the stability of displaying the number on the man-machine interface screen is ensured.
Optionally, on the basis of the foregoing embodiment, with continuing reference to fig. 3, the filter circuit 12 of the relay auxiliary contact monitoring device 100 provided in this embodiment includes an RC filter module 123 and a voltage follower 124, an input terminal of the RC filter module 123 is electrically connected to the input terminal 121 of the filter circuit 12, and an output terminal of the RC filter module 123 is connected to an input terminal of the voltage follower 124.
Specifically, the RC filtering module 123 performs a filtering function, and the voltage follower 124 performs a voltage following function on the filtered voltage signal.
Optionally, fig. 4 is a schematic structural diagram of another relay auxiliary contact monitoring device provided in the embodiment of the present invention. On the basis of the above embodiment, referring to fig. 4, the digital operation module 2 of the relay auxiliary contact monitoring device 100 provided in this embodiment includes a comparator 21 and a diode 22; a positive phase input end of the comparator 21 is electrically connected with an output end of the alternating current sampling module 1, and a negative phase input end of the comparator 21 is used for inputting a reference voltage Ur; the output terminal of the comparator 21 is electrically connected to the anode of the diode 22, and the cathode of the diode 22 is electrically connected to the output terminal of the digital operation module 2.
Specifically, the comparator 21 performs a voltage comparison function when the voltage signal inputted to the digital operation module 2 is greater than or equal to the reference voltageAt voltage Ur, the comparator 21 outputs a high level UohWhen the voltage signal inputted to the digital operation module 2 is less than the reference voltage Ur, the comparator 21 outputs a low level UolTo implement analog-to-digital conversion. By setting the appropriate reference voltage Ur, measurement errors caused by the induced electrical signal can be prevented. Optionally, with continued reference to fig. 4, the digital operation module 2 may further include a zener diode 24, and the zener diode 24 plays a role of voltage stabilization. The digital operation module 2 may further include a fourth resistor 23 and a fifth resistor 25, and the fourth resistor 23 and the fifth resistor 25 form a voltage division network to perform a voltage division function.
Optionally, fig. 5 is a schematic structural diagram of another relay auxiliary contact monitoring device provided in an embodiment of the present invention. On the basis of the foregoing embodiment, referring to fig. 5, the relay auxiliary contact monitoring device 100 provided in this embodiment further includes a station-side maintenance substation module 5, the station-side maintenance substation module 5 is in communication connection with the communication processing module 3, and the station-side maintenance substation module 5 is configured to obtain a digital signal through the communication processing module 3.
Specifically, the station-side maintenance substation module 5 can display the whole disconnecting link control circuit, and mark the on-off condition of the disconnecting link circuit by using the node color, for example, green can be set to indicate that the node voltage of the auxiliary contact of the relay, which is far away from the power supply, has a potential, and red indicates that the node voltage of the auxiliary contact of the relay, which is far away from the power supply, has no potential, so that the fault can be judged visually by displaying the color of an image, and the station-side maintenance substation module is convenient for operators and relay protection automation personnel to monitor the disconnecting link control circuit.
Optionally, fig. 6 is a schematic structural diagram of another relay auxiliary contact monitoring device provided in the embodiment of the present invention. On the basis of the foregoing embodiment, referring to fig. 6, the relay auxiliary contact monitoring device 100 provided in this embodiment further includes a scheduling maintenance master station module 6, where the scheduling maintenance master station module 6 is in communication connection with the station-side maintenance substation module 5, and the scheduling maintenance master station module 6 is configured to obtain the digital signal through the station-side maintenance substation module 5.
Specifically, the relay auxiliary contact monitoring device 100 sends the scheduling maintenance master station module 6 to a non-real-time channel in the secondary security area II through an IEC61850 protocol.
Optionally, fig. 7 is a schematic structural diagram of a disconnecting link control system according to an embodiment of the present invention. On the basis of the above embodiments, referring to fig. 7, the knife switch control system provided in the embodiment of the present invention includes the relay auxiliary contact monitoring device 100, the knife switch control loop 200, and the knife switch provided in any of the above embodiments; the knife switch control loop 200 is used for controlling the on/off of the knife switch; the knife switch control loop comprises a first relay 201, the first relay 201 comprises an auxiliary contact 202; the relay auxiliary contact monitoring device 100 is used to monitor the conduction state of the auxiliary contact 202 of the first relay 201.
Specifically, the relay auxiliary contact monitoring device 100 is installed in the line measurement and control screen, and the relay auxiliary contact monitoring device 100 can monitor the conduction state of the auxiliary contact 202 of the first relay 201 in the disconnecting link control circuit 200, so that maintenance personnel can check the condition of the disconnecting link control circuit conveniently. Illustratively, continuing with fig. 6 and 7, the potential is represented by a high level of 1 and a low level of 0. If there is a problem with the field relay auxiliary contact K1 closing, resulting in a failure of the knife switch control loop 200, both the relay auxiliary contacts K2 and S1 fail. The potentials of the nodes n11, n12 and n13 are all 0 and other loops are conducted through the measurement of the in-situ monitoring device, therefore, the potentials of the nodes n881, n882 and n883 are not 0, sampling processing is performed through the alternating current sampling module 1, after analog-to-digital conversion is performed by the digital operation module 2, the output potential is 1 and then transmitted to the station maintenance substation module 5 through the communication processing module 3, only the colors of the nodes n11, n12 and n13 are displayed in red, and the other nodes are displayed in green. The scheduling maintenance master station module 6 can also receive and display potential information of each detected node of the relay auxiliary contact, timely inform team personnel of entering the station for maintenance, replace the auxiliary contacts with corresponding models, shorten the time for finding and eliminating defects and improve the working efficiency.
Optionally, the switch control loop of the switch control system provided in the embodiment of the present invention further includes a motor and a motor control circuit; the disconnecting link control circuit controls the motor through the motor control circuit, and the motor acts to drive the disconnecting link to be switched on or off; the motor control circuit comprises a second relay, and the second relay comprises an auxiliary contact; the relay auxiliary contact monitoring device is also used for monitoring the conduction state of the auxiliary contact of the second relay.
Optionally, the motor controls the motor to rotate forwards or backwards through the motor control circuit, and the disconnecting link can be driven to be closed when the motor rotates forwards; when the motor rotates reversely, the driving disconnecting link is disconnected. Including the second relay in the motor control circuit, can adopt relay auxiliary contact monitoring devices to monitor the auxiliary contact of second relay to in time discover the closed defect of the auxiliary contact of second relay in the motor control circuit, shorten the time of discovery and elimination trouble, further improve work efficiency.
It should be noted that, with reference to fig. 6, if there is a measurement and control device, a monitoring background, and an intelligent telecontrol device on site, only the ac sampling module 1 and the digital operation module 2 in the relay auxiliary contact monitoring device 100 may be added to convert the voltage signal into a digital signal, and the plug-in unit is switched in, controlled, opened, and out, so that a hard contact signal may be obtained, where the voltage signal is 1, and the voltage signal is not 0. Fig. 8 is a schematic display interface diagram of a human-machine interface screen of a relay auxiliary contact monitoring device according to an embodiment of the present invention. On the basis of the embodiment, referring to fig. 8, the communication module of the measurement and control device is used for transmitting the signals to the monitoring background, the visual loop interface of the disconnecting link can be manufactured by adding the graph source signals, and then the signals are transmitted to the master scheduling and maintaining station module from the intelligent telecontrol device through the alarm direct transmission, so that the reconstruction cost can be reduced. It should be noted that fig. 8 exemplarily shows a relay, the model is HH53P11, the node potential 1 corresponding to the relay is ON, which indicates that the potential at the node potential 1 corresponding to the relay is at a high level; the node potential 2 corresponding to the relay is ON, which indicates that the potential at the node potential 2 corresponding to the relay is high level; the node potential 3 corresponding to the relay is ON, which indicates that the potential at the node potential 3 corresponding to the relay is high level; the node potential 4 corresponding to the relay is ON, which indicates that the potential at the node potential 4 corresponding to the relay is high level; the node potential 5 corresponding to the relay is OFF, which indicates that the potential at the node potential 5 corresponding to the relay is low level; the node potential 6 corresponding to the relay is OFF, indicating that the potential at the node potential 6 corresponding to the relay is low.
Before the disconnecting link control system provided by the embodiment of the invention dispatches or an operator remotely operates the disconnecting link, the effectiveness of a disconnecting link control loop can be observed, and when the disconnecting link control loop is invalid, a team can be reminded of arrival processing in advance, so that the operation time is reduced, and the efficiency is improved; before the team member enters the station for work, the fault location can be pre-judged, if an auxiliary contact of a certain model is damaged, spare parts can be prepared in advance, and when the team member enters the station for work, the fault can be directly processed, so that the fault judgment time is shortened, and the defect elimination efficiency is improved; because the knife switch control circuit is visual, the device can directly work in a fault area, the working range is reduced, and the operation risk is reduced.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A relay auxiliary contact monitoring device, comprising:
the alternating current sampling module is connected with one end, far away from the power supply side, of the auxiliary contact of the relay; the alternating current sampling module is used for collecting the voltage of one end, far away from the power supply side, of the auxiliary contact of the relay;
the digital operation module is connected with the alternating current sampling module and is used for converting the voltage signal output by the alternating current sampling module into a digital signal;
the communication processing module is respectively connected with the digital operation module and the human-computer interface screen, the communication processing module is used for transmitting the digital signals to the human-computer interface screen, and the human-computer interface screen is used for displaying the conduction state of the auxiliary contact of the relay according to the digital signals.
2. The relay auxiliary contact monitoring device of claim 1, wherein the ac sampling module comprises a sample-and-hold circuit and a filter circuit;
the input end of the filter circuit is electrically connected with the input end of the alternating current sampling module; the filter circuit is used for filtering noise voltage of power frequency;
the input end of the sampling hold circuit is electrically connected with the output end of the filter circuit; the output end of the sampling and holding circuit is electrically connected with the output end of the alternating current sampling module, and the sampling and holding circuit is used for holding the collected voltage.
3. The relay auxiliary contact monitoring device of claim 2, wherein the sample and hold circuit comprises: the circuit comprises a first operational amplifier, a second operational amplifier, a first resistor, a second resistor, a third resistor, a first capacitor and a second capacitor;
the positive phase input end of the first operational amplifier is electrically connected with the output end of the filter circuit, the inverting input end of the first operational amplifier is electrically connected with the first end of the second resistor and the first end of the third resistor, the output end of the first operational amplifier is electrically connected with the positive phase input end of the second operational amplifier and the first end of the second capacitor through the first resistor, and the second end of the second capacitor is grounded; the inverting input end of the second operational amplifier is electrically connected with the second end of the second resistor and the first end of the first capacitor; and the output end of the second operational amplifier is electrically connected with the second end of the third resistor and the second end of the first capacitor.
4. The relay auxiliary contact monitoring device of claim 2, wherein the filter circuit comprises: an RC filtering module and a voltage follower, wherein,
the input end of the RC filter module is electrically connected with the input end of the filter circuit, and the output end of the RC filter module is connected with the input end of the voltage follower.
5. The relay auxiliary contact monitoring device of claim 1, wherein the digital operation module comprises: a comparator and a diode;
the positive phase input end of the comparator is electrically connected with the output end of the alternating current sampling module, and the negative phase input end of the comparator is used for inputting reference voltage; the output end of the comparator is electrically connected with the anode of the diode, and the cathode of the diode is electrically connected with the output end of the digital operation module.
6. The relay auxiliary contact monitoring device of claim 1, further comprising:
a station end maintenance substation module which is in communication connection with the communication processing module,
and the station end maintenance substation module is used for acquiring the digital signal through the communication processing module.
7. The relay auxiliary contact monitoring device of claim 6, further comprising:
and the scheduling and maintaining main station module is in communication connection with the station end maintaining sub-station module and is used for acquiring the digital signal through the station end maintaining sub-station module.
8. A switch control system, comprising the relay auxiliary contact monitoring device of any one of claims 1 to 7, a switch control circuit and a switch;
the disconnecting link control loop is used for controlling the disconnecting link to be connected or disconnected;
the knife switch control loop comprises a first relay, and the first relay comprises an auxiliary contact;
the relay auxiliary contact monitoring device is used for monitoring the conduction state of the auxiliary contact of the first relay.
9. The knife control system of claim 8, wherein the knife control loop further comprises: a motor and a motor control circuit;
the disconnecting link control circuit controls the motor through the motor control circuit, and the motor acts to drive the disconnecting link to be switched on or off;
the motor control circuit includes a second relay including an auxiliary contact;
the relay auxiliary contact monitoring device is also used for monitoring the conduction state of the auxiliary contact of the second relay.
10. The knife gate control system of claim 9,
the motor control circuit controls the motor to rotate forwards or backwards;
when the motor rotates forwards, the disconnecting link is driven to be closed; and when the motor rotates reversely, the disconnecting link is driven to be disconnected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110424303.6A CN113114217A (en) | 2021-04-20 | 2021-04-20 | Relay auxiliary contact monitoring device and switch control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110424303.6A CN113114217A (en) | 2021-04-20 | 2021-04-20 | Relay auxiliary contact monitoring device and switch control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113114217A true CN113114217A (en) | 2021-07-13 |
Family
ID=76719322
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110424303.6A Pending CN113114217A (en) | 2021-04-20 | 2021-04-20 | Relay auxiliary contact monitoring device and switch control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113114217A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4972290A (en) * | 1989-09-29 | 1990-11-20 | Abb Power T & D Company Inc. | Electric power system with remote monitoring and control of protective relays |
| CN202126461U (en) * | 2011-06-22 | 2012-01-25 | 北京高新东方智能配电系统有限公司 | Safety monitoring module for electrical contact |
| CN202210140U (en) * | 2011-06-08 | 2012-05-02 | 河北工业大学 | Experimental device for life of alternating current contactor |
| CN103943410A (en) * | 2014-04-22 | 2014-07-23 | 宁波燎原电器集团股份有限公司 | Automatic switchover switching circuit based on magnetic latching relay |
| US20170254852A1 (en) * | 2016-03-01 | 2017-09-07 | Eaton Corporation | Apparatus and methods for monitoring auxiliary contact status |
-
2021
- 2021-04-20 CN CN202110424303.6A patent/CN113114217A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4972290A (en) * | 1989-09-29 | 1990-11-20 | Abb Power T & D Company Inc. | Electric power system with remote monitoring and control of protective relays |
| CN202210140U (en) * | 2011-06-08 | 2012-05-02 | 河北工业大学 | Experimental device for life of alternating current contactor |
| CN202126461U (en) * | 2011-06-22 | 2012-01-25 | 北京高新东方智能配电系统有限公司 | Safety monitoring module for electrical contact |
| CN103943410A (en) * | 2014-04-22 | 2014-07-23 | 宁波燎原电器集团股份有限公司 | Automatic switchover switching circuit based on magnetic latching relay |
| US20170254852A1 (en) * | 2016-03-01 | 2017-09-07 | Eaton Corporation | Apparatus and methods for monitoring auxiliary contact status |
Non-Patent Citations (1)
| Title |
|---|
| 任家富 等: "《数据采集与总线技术》", 30 September 2008 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104092310B (en) | A kind of intelligent power distribution monitoring and energy management system backstage | |
| CN102175951B (en) | Distribution network fault detection system | |
| CN103091602B (en) | Power line carrier wave online fault detection device | |
| WO2021217695A1 (en) | Smart data collection and sorting system for smart factory framework-based power supply and distribution grid | |
| CN202737576U (en) | Intelligent measure-control apparatus used for low voltage power distribution network | |
| CN102868221A (en) | Intelligent drawer switch cabinet | |
| CN104836626A (en) | Digital transformer station distributed test system | |
| CN113114217A (en) | Relay auxiliary contact monitoring device and switch control system | |
| CN101359843A (en) | Switch cupboard monitoring management apparatus | |
| CN110837026A (en) | Power distribution network fault detection device, system and method | |
| CN111142059A (en) | Intelligent detection device and method for PT unit of outdoor ring main unit | |
| CN211209379U (en) | Distribution terminal full coverage area distributed self-healing system | |
| CN210016321U (en) | Tripping alarm device for branch switch of outgoing line in distribution station area | |
| CN202770951U (en) | Remote signal acquisition circuit with direct current grounding automatic line selection function | |
| CN112332544A (en) | Five-prevention device for microcomputer | |
| CN213149535U (en) | Remote diagnosis system for solid-liquid separation equipment | |
| CN205485454U (en) | Mutual -inductor is sampling device on spot | |
| CN213957481U (en) | Transmission and transformation extra-high voltage monitoring system | |
| CN211206765U (en) | Intelligent detection device for PT unit of outdoor ring main unit | |
| CN110596523A (en) | Power cable fault detection method | |
| CN111262342B (en) | Monitoring equipment of low-voltage distribution system | |
| CN215580531U (en) | Switch cabinet remote control system | |
| CN218470884U (en) | Distribution network ground fault studying and judging system | |
| CN110596525A (en) | High-voltage power cable fault detection system | |
| CN217639981U (en) | Power distribution room power platform monitoring system |
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 | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210713 |