CN117424350A - Ground connection pulse selection dynamic monitoring controller - Google Patents
Ground connection pulse selection dynamic monitoring controller Download PDFInfo
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- CN117424350A CN117424350A CN202311736883.8A CN202311736883A CN117424350A CN 117424350 A CN117424350 A CN 117424350A CN 202311736883 A CN202311736883 A CN 202311736883A CN 117424350 A CN117424350 A CN 117424350A
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- 238000004891 communication Methods 0.000 claims description 9
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/54—Testing for continuity
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00016—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00028—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment involving the use of Internet protocols
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/40—Display of information, e.g. of data or controls
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Human Computer Interaction (AREA)
- Computer Networks & Wireless Communication (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a dynamic monitoring controller for ground pulse selection, which relates to the technical field of power control and comprises the following components: the signal acquisition module and the microcomputer processing unit; the signal acquisition module is used for acquiring power parameters of the power system; the microcomputer processing unit processes the power parameters and determines the fault type; the signal acquisition module includes: the broadband circuit loop comprises a dynamic capture detector, wherein the dynamic capture detector senses three-phase power of a bus with a primary side connected with the power system, and the dynamic capture detector is used for converting high voltage of the bus of the power system into low voltage; the secondary detuning circuit comprises a three-phase electrical series connection of the secondary side of the dynamic capture detector. And the operation faults such as overvoltage faults, low-voltage faults, voltage loss faults and the like of the power system are accurately judged. The pulse selecting module realizes accurate pulse selection, rapid action and more perfect monitoring protection.
Description
Technical Field
The invention relates to the technical field of power control, in particular to a ground pulse selection dynamic monitoring controller.
Background
In the prior art, the power system of large-scale factories and mining enterprises such as power plants, transformer substations, steel, coal, petrochemical industry and the like needs to be monitored, however, the existing monitoring controller has the technical problem that the processing speed of monitoring data of the power system is low, the technical requirement of rapidly acquiring fault information cannot be met, and in addition, the controller in the prior art has the conditions that fault judgment is inaccurate and fault judgment errors are easy to occur.
Disclosure of Invention
The invention provides a ground pulse selection dynamic monitoring controller which is used for accurately judging operation faults such as overvoltage faults, low-voltage faults, voltage loss faults, ground faults, disconnection faults and the like of a power system.
According to an aspect of the present disclosure, there is provided a ground pulse selection dynamic monitoring controller, the controller including: the system comprises a signal acquisition module, a microcomputer processing unit, a display screen and an alarm unit;
the signal acquisition module is used for acquiring power parameters of the power system;
the microcomputer processing unit is used for processing the electric power parameters and determining fault types;
the display screen is used for setting parameters of the controller, displaying three-phase voltage and voltage phase sequence, and displaying a pulse current pulse selection interface and a waveform recording interface;
the alarm unit is used for alarming according to the control signal of the microcomputer processing unit;
the signal acquisition module comprises: the broadband circuit loop comprises dynamic capture detection, wherein the primary side of the dynamic capture detector is connected with three-phase power of a bus of the power system, and the secondary side of the dynamic capture detector is connected with a voltage signal input end of the second input/output terminal row; the dynamic capture detector is used for converting high bus voltage of the power system into low voltage;
the secondary detuning circuit comprises a three-phase electrical series connection of a secondary side of the dynamic capture detector, comprising: one end of the phase A electricity is connected to a common ground port of the third input/output/terminal row through a seventh protection switch, the other end of the phase A electricity is connected to one end of the phase B electricity, the other end of the phase B electricity is connected to one end of the phase C electricity, the other end of the phase C electricity is grounded and connected to an empty port of the second input/output/terminal row, the common ground port of the second input/output/terminal row is connected to one end of a secondary harmonic elimination resistor through a first switch, and the other end of the secondary harmonic elimination resistor is grounded, wherein the secondary harmonic elimination resistor is an adjustable resistor.
Preferably, the controller comprises a plurality of pulse selecting modules, the pulse selecting modules comprise pulse selecting units and high-frequency current transformers, the high-frequency current transformers are connected with signal input ends of the pulse selecting units, signal output ends of the pulse selecting units are connected to signal input ends of a fourth input/output terminal row, the high-frequency current transformer is used for sensing a current signal of a cable to be detected, the pulse selecting unit is used for processing the current signal, and a processed result is output to the microcomputer processing unit through a fourth input/output terminal row.
Preferably, the communication unit is configured to send the monitoring data of the controller to an intelligent terminal, or receive a control signal of the intelligent terminal.
Preferably, the fault type includes: overvoltage faults, low voltage faults, voltage loss faults, grounding faults and disconnection faults;
the microcomputer processing unit judges according to the voltage value and the period and the phase of the three-phase voltage, the voltage value and the period and the phase of the opening voltage, which are acquired by the broadband circuit loop, when the three-phase voltage is simultaneously overvoltage, the overvoltage alarm relay is controlled to be attracted, when the three-phase voltage is simultaneously low-voltage, the low-voltage alarm relay is controlled to be attracted, when the three-phase voltage is simultaneously undervoltage, the undervoltage alarm relay is controlled to be attracted, when the three-phase has a grounding fault, the microcomputer processing unit outputs a grounding alarm, and when a bus three-phase electric of the electric power system is connected with a fuse arranged before the dynamic capture detector, the relay is controlled to be broken, and the alarm is attracted.
Preferably, the microcomputer processing unit judges whether the cable to be detected has a fault or not according to the three-phase electric voltage signal acquired by the broadband circuit loop, the opening voltage in the secondary resonance elimination circuit and the result of processing the electric current signal by the pulse selecting unit.
Preferably, the controller periodically measures the three-phase voltage and the open-phase voltage.
Preferably, the controller comprises a keyboard control module and a power supply module, wherein the keyboard control module is used for controlling the opening and closing of a relay in the controller; the power module is used for providing power for the controller.
Compared with the prior art, the invention has the beneficial effects that:
according to the ground connection pulse selection dynamic monitoring controller, through the broadband circuit loop, the third input/output terminal row and the secondary resonance elimination circuit which are included in the signal acquisition module, operation faults such as overvoltage faults, low-voltage faults, voltage loss faults, ground faults, disconnection faults and the like of the power system are accurately judged.
Moreover, the pulse selection is accurate, the action is rapid, the functions of monitoring protection and the like are realized more perfectly, and the faults and the time of the faults can be recorded in real time through a plurality of pulse selection modules in the controller.
The ground pulse selection dynamic monitoring controller of the embodiment of the disclosure has good electromagnetic compatibility and is suitable for being applied in a complex environment with strong electromagnetic interference.
Drawings
Fig. 1 illustrates a block diagram of a ground pulse dynamic monitor controller according to an embodiment of the present disclosure.
Fig. 2 shows a circuit diagram of a signal acquisition module of a ground pulse dynamics-monitoring controller according to an embodiment of the present disclosure.
FIG. 3 illustrates a display interface schematic of a dynamic monitor controller according to an embodiment of the present disclosure.
FIG. 4 illustrates a display interface schematic of a dynamic monitor controller according to an embodiment of the present disclosure.
FIG. 5 illustrates a display interface schematic of a dynamic monitor controller according to an embodiment of the present disclosure.
FIG. 6 illustrates a display interface schematic of a dynamic monitor controller according to an embodiment of the present disclosure.
Fig. 7 shows a schematic diagram of an input-output terminal block according to an embodiment of the present disclosure.
Detailed Description
Various exemplary embodiments, features and aspects of the disclosure will be described in detail below with reference to the drawings. In the drawings, like reference numbers indicate identical or functionally similar elements. Although various aspects of the embodiments are illustrated in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The word "exemplary" is used herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
In addition, numerous specific details are set forth in the following detailed description in order to provide a better understanding of the present disclosure. It will be understood by those skilled in the art that the present disclosure may be practiced without some of these specific details. In some instances, methods, means, elements, and circuits well known to those skilled in the art have not been described in detail in order not to obscure the present disclosure.
Fig. 1 illustrates a block diagram of a ground pulse dynamic monitor controller according to an embodiment of the present disclosure. As shown in fig. 1, the controller includes: the system comprises a signal acquisition module, a microcomputer processing unit, a display screen and an alarm unit;
the signal acquisition module is used for acquiring power parameters of the power system; for example, the power parameters include a 0-35kv system bus three-phase voltage.
The microcomputer processing unit is used for processing the electric power parameters and determining fault types;
the display screen is used for setting parameters of the controller and displaying three-phase voltage and voltage phase sequence;
the alarm unit is used for alarming according to the control signal of the microcomputer processing unit;
fig. 2 shows a circuit diagram of a signal acquisition module of a ground pulse dynamics-monitoring controller according to an embodiment of the present disclosure. As shown in fig. 2, the signal acquisition module includes: a broadband circuit loop, a third input/output terminal row C, a first input/output terminal row A, a second input/output terminal row B and a secondary resonance elimination circuit, wherein the broadband circuit loop comprises a dynamic capture detector DJA, DJB, DJC, a primary side of the dynamic capture detector is connected with bus three-phase electricity of the power system, for example, a 10kv system bus is introduced into an input end of the broadband circuit loop, a secondary side of the dynamic capture detector is connected with a voltage signal input end of the second input/output terminal row B, for example, the secondary side of the dynamic capture detector is connected with 17-19 ports of the third input/output terminal row C through protection switches 4DK,5DK,6DK, namely, ma, mb and Mc ends; the dynamic capture detector is used for converting high voltage of a bus of the power system into low voltage.
Terminal a may be used for a control output of the controller. Terminal B may be used to control the signal output switching value. Terminal C may be used to connect the output of a broadband circuit loop or the output of a secondary detuning circuit.
In fig. 2, the a phase, the B phase and the C phase of the three-phase power supply are connected in series, the da end of the dynamic capture detector DJA of the a phase is connected to the first end 1 of the protection switch 7DK, the second end 2 of the protection switch 7DK is connected to the 16 port of the terminal C, the dn end of the C phase is grounded, the second end 2 of the protection switch 7DK is connected to the first end of the second harmonic resistor, the second end of the second harmonic resistor R is grounded, and the second end of the second harmonic resistor is connected to the 15 port of the C terminal. The second harmonic resistor receives a control signal from the controller via terminal B to access the circuit or adjust the resistance of the second harmonic resistor, which is not shown in fig. 2, and the second harmonic resistor may be controlled via a control switch, as would be understood by those skilled in the art, such as via the 20 and 17 ports of terminal B. Circles in fig. 2 are slashed to indicate shorting at the node. Fig. 7 shows a schematic diagram of an input-output terminal block according to an embodiment of the present disclosure.
Terminal a defines:
19-20 devices working power inputs, 18 grounding common terminals; 17 is empty; 11-16 for standby; 9-10, comprehensively alarming and outputting signals; 7-8 overvoltage action alarm signals; 5-6, a disconnection action alarm signal; 3-4, a power-off action alarm signal; 1-2 pulse selection action alarm signals.
Terminal C defines: 19: a UA voltage signal; 18: UB voltage signal, C17: UC voltage signal; and C16: UO public land; and C15: empty; c14: UN open voltage; 11-13: standby; c10: RS485A/L; c9: RS485B/H.
Terminal B is a controller signal output switch measuring plate: 19-20 public terminals; 18: an interlock input; 13-17 standby switching value inputs; 12 isolating the knife action input; 7-8 interlocking outputs; 1-6 standby switching value.
Terminal EF defines: CAH-H pulse selection unit signal introduction; CAH-L pulse selection unit signal introduction; +24v pulse selection unit power supply introduction; -24V pulse selection unit power supply introduction; +23V pulse selection unit power supply output; -23V pulse selection unit power supply output; E1-E10 for standby; +12v: standby; -12V: standby; +10V for standby; -10V for use.
The secondary detuning circuit comprises a three-phase electrical series connection of a secondary side of the dynamic capture detector, comprising: one end of the phase A is connected to the common ground port of the third input/output terminal row C through a seventh protection switch 7DK, the other end of the phase A is connected to one end of the phase B, the other end of the phase B is connected to one end of the phase C, the other end of the phase C is grounded and connected to the empty port of the second input/output terminal row B, the common ground port of the second input/output terminal row B is connected to one end of a secondary harmonic elimination resistor through a first switch, and the other end of the secondary harmonic elimination resistor is grounded, wherein the secondary harmonic elimination resistor is an adjustable resistor.
When resonance occurs at the high-voltage side, the PTK action of the voltage transformer eliminates primary resonance, the voltage and the frequency of an open triangular loop after the secondary resonance of the system are sent to the controller, the controller sends out a closing signal, and the secondary resonance elimination resistor is put into a circuit to realize the function of eliminating secondary resonance.
The broadband circuit loop can be a broadband voltage sensor which is connected to a A, B, C three-phase 10kV system bus to convert high voltage into low voltage signals and transmit the low voltage signals to a third input/output/terminal strip in the controller.
According to the ground connection pulse selection dynamic monitoring controller, through the broadband circuit loop, the third input/output terminal row and the secondary resonance elimination circuit which are included in the signal acquisition module, operation faults such as overvoltage faults, low-voltage faults, voltage loss faults, ground faults, disconnection faults and the like of the power system are accurately judged. The state monitoring controller has the secondary harmonic elimination function: the harmonic elimination function of the controller integrates two harmonic elimination methods, the first method is that no resistor is connected in series, the opening voltage is directly and instantaneously short-circuited to eliminate the harmonic, the mode is only suitable for the condition of smaller harmonic elimination power, the second additional resistor can be called as a secondary harmonic elimination resistor, the resistance value is about 50-100 ohms, and therefore, the resistance value of the secondary harmonic elimination resistor can be controlled through the magnitude of the bus voltage of the power system, and the harmonic elimination power is improved. The product can be directly connected, can be externally added, and has the function of controlling harmonic elimination power.
The controller is compact in structure through modularized design, and the high-speed DSP core processor ensures operation instantaneity and action accuracy; the state of the power system is monitored in real time, accurate judgment is made on the abnormal running state, and control actions are made in time.
In one possible implementation manner, the controller includes a plurality of pulse selecting modules, the pulse selecting modules include a pulse selecting unit and a high-frequency current transformer, the high-frequency current transformer is connected with a signal input end of the pulse selecting unit, a signal output end of the pulse selecting unit is connected to a signal input end of a fourth input/output terminal row, the high-frequency current transformer is used for sensing a current signal of a cable to be detected, the pulse selecting unit is used for processing the current signal, and a processed result is output to the microcomputer processing unit through the fourth input/output terminal row.
In fig. 2, the ends 15 and 16 of the pulse selection unit 1 are respectively connected with the end S2 and the end S1 of the high-frequency current transformer (i.e. the high-frequency CT in the drawing), the end S2 is grounded, and the end 5 and the end 7 of the pulse selection unit 1 are respectively connected with the CAN-L port and the CAN-H port of the EF terminal, so as to output the current information processed by the pulse selection unit to the EF terminal and further output to the microcomputer processing unit of the controller. The controller further comprises a power supply module KC100, shown in FIG. 2, wherein LB-2 of the power supply module is connected to the positive electrode +24V of the power supply of the pulse selection unit 1, positive electrode +23V of the power supply of the pulse selection unit 33, and-23 of the EF terminal (power output end of the pulse selection unit) is connected to the positive electrode-24 of the power supply of the pulse selection unit 1 and the positive electrode-23 of the pulse selection unit 33 to supply power to the pulse selection unit; LB-2 of the power supply module is connected to +24V (pulse select unit power supply input) of EF terminal.
Also shown in fig. 2 is the manner in which the pulse selection unit 33 (i.e., LB 33) is connected to the power supply module, and a plurality of pulse selection units may be provided during use of the controller, each pulse selection unit being connected to the EF terminal in the same manner. This disclosure does not describe this in detail.
For example, a current signal sensed by the high-frequency current transformer is sent to the pulse selection unit, the pulse selection unit extracts and analyzes the current information and sends the high-frequency signal to the controller, the controller collects a voltage signal, a current signal, a high-frequency waveform signal of the power system, and converts the change amount of the phase angle, and the determining the fault type of the system includes: and (3) carrying out pulse selection, namely determining whether an online cable and an online cable in the current system have a leakage branch circuit or not.
The controller comprises a plurality of pulse selection modules which are accurate in pulse selection, so that the leakage condition of the branch can be judged in real time, and the pulse selection accuracy is more than 98%.
In one possible implementation manner, the communication unit is configured to send the monitoring data of the controller to an intelligent terminal, or receive a control signal of the intelligent terminal. For example, the communication unit in the controller can transmit the running state of the system to the upper computer through an RS-485 Modbus communication protocol of an industry standard, and an operation and maintenance worker of the system can send a control signal to the controller through the upper computer, for example, the control signal is used for controlling an input and output terminal in the controller so as to control the action of the relay.
In one possible implementation, the fault types include: overvoltage faults, low voltage faults, voltage loss faults, grounding faults and disconnection faults;
the microcomputer processing unit judges according to the voltage value and the period and the phase of the three-phase voltage, the voltage value and the period and the phase of the opening voltage, which are acquired by the broadband circuit loop, when the three-phase voltage is simultaneously overvoltage, the overvoltage alarm relay is controlled to be attracted, when the three-phase voltage is simultaneously low-voltage, the low-voltage alarm relay is controlled to be attracted, when the three-phase voltage is simultaneously undervoltage, the undervoltage alarm relay is controlled to be attracted, when the three-phase has a grounding fault, the microcomputer processing unit outputs a grounding alarm, and when a bus three-phase electric of the electric power system is connected with a fuse arranged before the dynamic capture detector, the relay is controlled to be broken, and the alarm is attracted.
For example, when the protection switch of the phase A electricity is judged to be opened, the protection switch of the phase B electricity is judged to be opened, and the protection switch of the phase C electricity is judged to be opened, the power-off alarm relay is controlled to be closed.
For example, the microcomputer processing unit performs the following processing: periodic measurements Ua, ub, uc of the three-phase voltages. The open voltage UL is periodically measured, 7DK, and the voltage is used as a pulse selection reference. The three-phase period and the opening period are measured, generally 10ms, and are used as the basis for judgment. And (3) comparing the three phases with the large value of the opening period to obtain a stable value which is used for display. The three phases are different in phase angle between the three phases and the open voltage. Judging the phase A, the phase B, the phase C or a fuse (the fuse is positioned in the front of the dynamic capture detector and is electrically connected with the bus three phases of the power system, and the relay is in disconnection alarming and closing, judging the function of simultaneously overvoltage and the relay is in overvoltage alarming and closing, judging the simultaneously low-voltage and low-voltage (undervoltage) alarming and closing of the three phases ABC, judging the simultaneously voltage dropping and the alarming and closing of the voltage losing of the three phases ABC, and outputting a grounding alarm when the three phases ABC have a grounding fault.
In one possible implementation manner, the microcomputer processing unit judges whether the cable to be detected is faulty or not according to the three-phase electric voltage signal acquired by the broadband circuit loop, the opening voltage in the secondary resonance elimination circuit and the result of processing the electric current signal by the pulse selecting unit.
In one possible implementation, the display screen is further used to display a pulse stream pulse selection interface and a waveform recording interface. For example, the controller has a fault recall function, displaying waveforms of all historical fault records. For example, the display screen can be Chinese liquid crystal touch display, so that the operation state is clear, and the menu type operation is convenient and easy to use.
Fig. 3-6 are schematic diagrams illustrating display interfaces of a dynamic monitor controller according to an embodiment of the present disclosure. A three-phase voltage display is shown in fig. 3, comprising: the three-phase voltage of the primary side and the three-phase voltage of the secondary side of the dynamic capture detector also comprise an opening voltage UL, and UL is 0 under normal conditions. Fig. 4 shows that the cycle time T in the three-phase-sequence state diagram is in ms level, and the phase-sequence state judgment according to the collected parameters shows that: AB and BC and ABC. When the AC is in the same order, then it is in the opposite order. ABC three phases normally differ by 120 degrees at a time. Fig. 5 shows a pulse selection interface of the KCXK type of the controller 1-16 paths, in which if a bright point appears, the pulse selection result indicates that the line fails, and also shows a zero sequence current (a current sensed by the high-frequency current transformer) and a zero sequence difference value (a difference value between the zero sequence current and a standard current), and the states can be off-line and on-line, the off-line indicates that the line is not monitored by the controller, and the on-line indicates that the line is monitored by the controller. Pulse routing including 17-32 paths may also be displayed.
The interface can be divided into: three-phase voltage, pulse selection, alarm recording, history curve, parameter setting, return to the first page and other options.
Fig. 6 shows a KCXK model controller main interface. The main interface may display waveforms of three-phase power collected by the controller, phase sequence, for example, "system voltage is normal-! The prompt of "also includes a" put and deliver "button.
In one possible implementation, the controller periodically measures the three-phase voltage and the open-ended voltage.
In one possible implementation manner, the controller comprises a keyboard control module and a power supply module, wherein the keyboard control module is used for controlling the opening and closing of a relay in the controller; the power module is used for providing power for the controller.
In one possible implementation manner, the ground pulse selection dynamic monitoring controller is equipped with the switch cabinet in an integrated layout, occupies a small volume, is reasonable in layout, simplifies the panel structural design of the switch cabinet, beautifies the panel layout of the switch cabinet, improves the indication function of the switch state and improves the safety performance of the switch cabinet.
For example, the panel of the switchgear is provided with the following signal indicator lights, interfaces or alarm modules or display interfaces:
and (3) running: normal operation indicator lamp, flashing frequency 1Hz, communication: and (3) pulse selection of an external communication interface RS 485: pulse selecting action is performed once, and the pulse selecting action is lighted once; and (3) grounding: alarming when the system monitors the ground fault; loss of connection: the zero sequence current acquisition unit is used for communicating with the fault indicator lamp; under-pressure: busbar undervoltage indicator lamp; decompression: a bus voltage-loss indicator lamp; breaking wire: a high-frequency voltage sensor disconnection indication; overpressure: alarming when the bus voltage is too high; high frequency: the system detects a bus high-frequency unstable voltage alarm; abnormality: system voltage abnormality indicator lamp; three-wire voltage interface: mainly displaying primary and secondary voltages; voltage phase sequence interface: displaying the voltage phase and judging the phase correctly; pulse-stream pulse-selection interface: pulse current pulse selection interface; waveform recording interface: waveform viewing and recording functions; parameter setting interface: and (5) setting and inputting functional parameters.
The detection report of the controller is shown in table 1. As can be seen in Table 1, the standard frequency is 50Hz, the frequency range that the controller can monitor is 27 Hz-150 Hz, the standard controller acquisition voltages are 57V, UA, UB, UC, UL, when UA, UB, UC, UL is 0, the controller can lose electricity and alarm, when UA, UB, UC, UL is less than 57V, the controller can lose voltage and alarm, and when UA, UB, UC, UL is greater than 57V, the controller can lose voltage and alarm. For example, when the voltage of UA, UB, UC, UL is 0v,57v,0v, respectively, the controller displays an a-phase disconnection warning. When the fuse is blown, the controller controls the FUA, FUB and FUC of the terminal B to be in short circuit with the COM end;
it should be noted that, for simplicity of description, the foregoing method embodiments are all described as a series of acts, but it should be understood by those skilled in the art that the present disclosure is not limited by the order of acts described, as some steps may be performed in other orders or concurrently in accordance with the present disclosure. Next, those skilled in the art should alsoIt is to be understood that the embodiments described in the specification are all alternative embodiments, and that the acts and modules referred to are not necessarily required in the present disclosure.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
In the several embodiments provided in the present disclosure, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, such as the division of the units, merely a logical function division, and there may be additional manners of dividing the actual implementation, such as multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, or may be in electrical or other forms.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in each embodiment of the present disclosure may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units described above may be implemented either in hardware or in software program modules.
The integrated units, if implemented in the form of software program modules, may be stored in a computer-readable memory for sale or use as a stand-alone product. Based on such understanding, the technical solution of the present disclosure may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a memory, comprising several instructions for causing a computer device (which may be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in the various embodiments of the present disclosure. And the aforementioned memory includes: a U-disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing program codes.
Those of ordinary skill in the art will appreciate that all or a portion of the steps in the various methods of the above embodiments may be implemented by a program that instructs associated hardware, and the program may be stored in a computer readable memory, which may include: flash disk, read-Only Memory (ROM), random access Memory (Random Access Memory, RAM), magnetic disk or optical disk.
The foregoing has described in detail embodiments of the present disclosure, with specific examples being employed herein to illustrate the principles and implementations of the present disclosure, the above examples being provided solely to assist in understanding the methods of the present disclosure and their core ideas; meanwhile, as one of ordinary skill in the art will have variations in the detailed description and the application scope in light of the ideas of the present disclosure, the present disclosure should not be construed as being limited to the above description.
Various aspects of the present disclosure are described herein with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the disclosure. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer-readable program instructions.
The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of instructions, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The foregoing description of the embodiments of the present disclosure has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the technical improvements in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (7)
1. A ground pulse selection dynamic monitoring controller, the controller comprising: the system comprises a signal acquisition module, a microcomputer processing unit, a display screen and an alarm unit;
the signal acquisition module is used for acquiring power parameters of the power system;
the microcomputer processing unit is used for processing the electric power parameters and determining fault types;
the display screen is used for setting parameters of the controller, displaying three-phase voltage and voltage phase sequence, and displaying a pulse current pulse selection interface and a waveform recording interface;
the alarm unit is used for alarming according to the control signal of the microcomputer processing unit;
the signal acquisition module comprises: the broadband circuit loop comprises dynamic capture detection, wherein the primary side of the dynamic capture detector is connected with three-phase power of a bus of the power system, and the secondary side of the dynamic capture detector is connected with a voltage signal input end of the second input/output terminal row; the dynamic capture detector is used for converting high bus voltage of the power system into low voltage;
the secondary detuning circuit comprises a three-phase electrical series connection of a secondary side of the dynamic capture detector, comprising: one end of the phase A electricity is connected to a common ground port of the third input/output/terminal row through a seventh protection switch, the other end of the phase A electricity is connected to one end of the phase B electricity, the other end of the phase B electricity is connected to one end of the phase C electricity, the other end of the phase C electricity is grounded and connected to an empty port of the second input/output/terminal row, the common ground port of the second input/output/terminal row is connected to one end of a secondary harmonic elimination resistor through a first switch, and the other end of the secondary harmonic elimination resistor is grounded, wherein the secondary harmonic elimination resistor is an adjustable resistor.
2. The ground fault pulse dynamic monitoring controller according to claim 1, wherein the controller comprises a plurality of pulse selection modules, the pulse selection modules comprise pulse selection units and high-frequency current transformers, the high-frequency current transformers are connected with signal input ends of the pulse selection units, signal output ends of the pulse selection units are connected to signal input ends of a fourth input/output terminal row, the high-frequency current transformers are used for sensing current signals of cables to be detected, the pulse selection units are used for processing the current signals, and processed results are output to the microcomputer processing unit through the fourth input/output terminal row.
3. The ground fault dynamic monitoring controller of claim 1, wherein the communication unit is configured to send monitoring data of the controller to an intelligent terminal or receive a control signal of the intelligent terminal.
4. A ground fault-pulse dynamic monitoring controller as set forth in claim 1 wherein the fault type comprises: overvoltage faults, low voltage faults, voltage loss faults, grounding faults and disconnection faults;
pulse line selection and waveform recording;
the microcomputer processing unit judges according to the voltage value and the period and the phase of the three-phase voltage, the voltage value and the period and the phase of the opening voltage, which are acquired by the broadband circuit loop, when the three-phase voltage is simultaneously overvoltage, the overvoltage alarm relay is controlled to be attracted, when the three-phase voltage is simultaneously low-voltage, the low-voltage alarm relay is controlled to be attracted, when the three-phase voltage is simultaneously undervoltage, the undervoltage alarm relay is controlled to be attracted, when the three-phase has a grounding fault, the microcomputer processing unit outputs a grounding alarm, and when a bus three-phase electric of the electric power system is connected with a fuse arranged before the dynamic capture detector, the relay is controlled to be broken, and the alarm is attracted.
5. The ground connection pulse selection dynamic monitoring controller according to claim 2, wherein the microcomputer processing unit judges whether a cable to be detected has a fault or not according to a three-phase electric voltage signal acquired by a broadband circuit loop, and a result of processing the electric current signal by an opening voltage and pulse selection unit in a secondary resonance elimination circuit.
6. A ground pulse dynamic monitoring controller as set forth in claim 5 wherein said controller periodically measures three phase voltages and open phase voltages.
7. The ground pulse dynamic monitoring controller according to claim 1, wherein the controller comprises a keyboard control module and a power supply module, wherein the keyboard control module is used for controlling the opening and closing of a relay in the controller; the power module is used for providing power for the controller.
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