CN111049095B - Cross-region integrated relay protection system - Google Patents

Cross-region integrated relay protection system Download PDF

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Publication number
CN111049095B
CN111049095B CN201911282471.5A CN201911282471A CN111049095B CN 111049095 B CN111049095 B CN 111049095B CN 201911282471 A CN201911282471 A CN 201911282471A CN 111049095 B CN111049095 B CN 111049095B
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resistor
power supply
unit
output end
mos tube
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CN111049095A (en
Inventor
杨晶
易鹏飞
杨显峰
姚远
梁科
黄银阳
刘义
刘亚洲
朱亦可
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STATE GRID CHONGQING ELECTRIC POWER Co CHANGSHOU POWER SUPPLY BRANCH
State Grid Corp of China SGCC
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STATE GRID CHONGQING ELECTRIC POWER Co CHANGSHOU POWER SUPPLY BRANCH
State Grid Corp of China SGCC
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Publication of CN111049095A publication Critical patent/CN111049095A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/0061—Details of emergency protective circuit arrangements concerning transmission of signals
    • H02H1/0069—Details of emergency protective circuit arrangements concerning transmission of signals by means of light or heat rays
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/0092—Details of emergency protective circuit arrangements concerning the data processing means, e.g. expert systems, neural networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/06—Arrangements for supplying operative power
    • 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
    • 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
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02B90/20—Smart grids as enabling technology in buildings sector
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • 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
    • Y04S10/16—Electric power substations
    • 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
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/12—Energy storage units, uninterruptible power supply [UPS] systems or standby or emergency generators, e.g. in the last power distribution stages
    • 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
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems
    • Y04S20/248—UPS systems or standby or emergency generators

Abstract

The invention provides a trans-regional integrated relay protection system, which comprises a main station device and a substation device, wherein the substation device is in communication connection with the main station device, and the main station device comprises a main controller, a setting logic calculation unit in communication connection with the main controller and a synchronous clock I in communication connection with the main controller; the substation device comprises an information acquisition unit, a switch, an execution unit and a synchronous clock II; the merging unit is in communication connection with the execution unit, the execution unit is in communication connection with the switch, the synchronous clock II is in communication connection with the switch, and the switch is in communication connection with the master station device; the system further comprises a power supply unit, and the power supply unit provides working electricity for the substation device. The substation device acquisition unit acquires power implementation data, the power implementation data are transmitted to the main control device through the special optical fiber, and the main control device performs setting calculation to control relay protection of a plurality of substation devices, so that cross-region integrated relay protection is realized.

Description

Cross-region integrated relay protection system
Technical Field
The invention relates to the field of power relay protection, in particular to a trans-regional integrated relay protection system.
Background
When a power system fails, a relay protection device is required to execute relay protection action, and the precondition for the correct action of the relay protection device of the power system is that electric quantity characteristics such as analog quantity and switching quantity which reflect the fault characteristics of the power system can be quickly and accurately received. In order to improve the reliability of the relay protection device for sampling the characteristics of the electric quantity, a series of measures are taken for designing the relay protection equipment of the power system, such as adopting a three-out-of-two tripping outlet mode to prevent the protection device from misoperation, adopting a double-CPU module serial mode to prevent the protection device from being mistakenly opened when a processor fails, setting a double-relay serial loop to prevent a tripping contact from being closed due to the mistaken excitation of a relay, adopting double-AD sampling to prevent the protection device from being refused or mistakenly operated due to the sampling abnormity of a single loop, introducing sampling value abnormity detection to timely find out the corresponding protection of abnormal locking of the sampling link, and the like. However, with the deep development of computer technology and network technology, the monitoring, measurement, control and protection of the relay protection of the power system are realized by real-time monitoring and on-line setting calculation, but the existing relay protection has low reliability and is easy to malfunction and refuse to operate.
Therefore, a transregional integrated relay protection system with high reliability of online real-time monitoring and setting calculation is needed.
Disclosure of Invention
In view of this, the present invention provides a transregional integrated relay protection system, which is used to solve the problem of poor reliability of a transregional integrated relay protection device in the prior art.
The invention provides a transregional integrated relay protection system, which is characterized in that: the device comprises a main station device and a substation device which is in communication connection with the main station device, wherein the main station device comprises a main controller, a setting logic calculation unit which is in communication connection with the main controller and a synchronous clock I which is in communication connection with the main controller;
the substation device comprises an information acquisition unit, a switch, an execution unit and a synchronous clock II;
the information acquisition unit comprises a merging unit, a voltage transformer, a current transformer, a temperature sensor, a photosensitive sensor and a gas sensor, wherein the output ends of the voltage transformer, the current transformer, the temperature sensor, the photosensitive sensor and the gas sensor are all connected with the input end of the merging unit;
the merging unit is in communication connection with the execution unit, the execution unit is in communication connection with the switch, the synchronous clock II is in communication connection with the switch, and the switch is in communication connection with the master station device;
the system further comprises a power supply unit, and the power supply unit provides working electricity for the substation device.
Further, the execution unit comprises an intelligent terminal and a relay, the intelligent terminal is in communication connection with the switch, and the relay is in communication connection with the intelligent terminal.
Further, the power supply adopts an alternating current and direct current dual power supply mode.
Furthermore, the power supply comprises an alternating current power supply unit, a direct current power supply unit and a switching control unit, wherein the input end of the alternating current power supply unit is connected with the power transmission line, the output end of the alternating current power supply unit is connected with the input end of the switching control unit, the direct current power supply unit adopts a storage battery for power supply, the output end of the direct current power supply unit is connected with the input end of the switching control unit, and the output end of the switching control unit is the output end of the power supply.
Further, the switching control unit comprises a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, an operational amplifier U2 and a MOS transistor Q4, one end of the resistor R3 is connected to the output end of the ac power supply unit, the other end of the resistor R3 is the output end of the power supply unit, one end of the resistor R6 is connected to the common connection point of the resistor R3 and the ac power supply unit, the other end of the resistor R6 is grounded via a resistor R7, one end of the resistor R4 is connected to the common connection point of the resistor R3 and the output end, the other end of the resistor R4 is connected to the inverting end of the operational amplifier U2, the non-inverting end of the operational amplifier U2 is connected to the common connection point of the resistor R6 and the resistor R6, one end of the resistor R6 is connected to the common connection point of the inverting end of the resistor R6 and the inverting end of the operational amplifier U6, the other end of the resistor R6 is connected to the gate of the MOS transistor Q6, the source electrode of the MOS transistor Q4 is connected with the output end of the direct current power supply unit, and the drain electrode of the MOS transistor Q4 is connected with the common connection point of the resistor R3 and the output end;
the MOS transistor Q4 is a P-channel enhancement type MOS transistor.
Further, the alternating current power supply unit includes current transformer, full-bridge rectifier circuit, filter circuit and protection unit, current transformer's input is connected with the power transmission line, current transformer's output with the input of full-bridge rectifier is connected, the output of full-bridge rectifier with filter circuit's input is connected, the protection unit includes transient suppression diode and voltage follower, transient suppression diode with the input of full-bridge rectifier is parallelly connected, the voltage follower is operational amplifier U1, operational amplifier U1's homophase end with filter circuit's output is connected, operational amplifier U1's inverting terminal is connected with the output, operational amplifier U1's output with the input of switching control unit is connected.
Furthermore, the power supply also comprises a voltage-stabilizing output unit, wherein the input end of the voltage-stabilizing output unit is connected with the output end of the alternating current power supply unit, and the output end of the voltage-stabilizing output unit is connected with the input end of the switching control unit;
the voltage stabilizing output unit comprises a piezoresistor RV, a resistor R2, a resistor R10, a voltage stabilizing diode DW1, an MOS tube Q1 and an MOS tube Q2, one end of the piezoresistor RV is connected with the output end of the alternating current power supply unit, the other end of the piezoresistor RV is grounded through a resistor R10, one end of a resistor R2 is connected with the output end of the alternating current power supply unit, the other end of the resistor R2 is connected with the source of the MOS tube Q2, the grid of the MOS tube Q2 is connected with the common connection point of the piezoresistor RV and the resistor R10, the drain of the MOS tube Q1 is connected with the output end of the alternating current power supply unit, the source of the MOS tube Q1 is connected with one end of the resistor R3, the grid of the MOS tube Q1 is connected with the drain of the MOS tube Q2, the cathode of the voltage stabilizing diode DW1 is connected with the common connection point of the drain of the MOS tube Q2 and the grid of the MOS tube Q1, and the anode of the voltage stabilizing diode DW1 is grounded;
the MOS transistor Q1 is an N-channel enhancement type MOS transistor, and the MOS transistor Q2 is a P-channel enhancement type MOS transistor.
Furthermore, the power supply also comprises an overcurrent self-locking unit, the input end of the overcurrent self-locking unit is connected with the output end of the switching control unit, and the output end of the overcurrent self-locking unit is the output end of the power supply;
the overcurrent self-locking unit comprises a resistor R8, a resistor R9, a comparator U3 and an MOS tube Q3, one end of the resistor R8 is connected with a common connection point of the drains of the resistor R3 and the MOS tube Q3, the other end of the resistor R8 is grounded through the resistor R9, the same-phase end of the comparator U3 is connected with a common connection point of the resistor R8 and the resistor R9, the reverse-phase end of the comparator U3 is connected with a reference voltage REF, the source of the MOS tube Q3 is connected with a common connection point of the resistor R3 and the drain of the MOS tube Q4, the drain of the MOS tube Q3 is an output end, and the gate of the MOS tube Q3 is connected with the output end of the comparator U3;
the MOS transistor Q3 is a P-channel enhancement type MOS transistor.
The invention has the beneficial technical effects that: the substation device acquisition unit acquires power implementation data, transmits the power implementation data to the main control device through a special optical fiber, and controls the relay protection of a plurality of substation devices through setting calculation of the main control device, so that trans-regional integrated relay protection is realized; meanwhile, the mode of supplying power to the acquisition unit by adopting double currents ensures that the acquisition unit continuously supplies power, and can normally acquire power data even when power is cut off and maintained, thereby ensuring the reliability of cross-region integrated relay protection.
Drawings
The invention is further described below with reference to the following figures and examples:
FIG. 1 is a block diagram of the structure of the present invention.
Fig. 2 is a block diagram showing the structure of the master station apparatus of the present invention.
Fig. 3 is a block diagram showing the structure of the slave station device of the present invention.
Fig. 4 is a block diagram of the power supply structure of the present invention.
Fig. 5 is a schematic diagram of a power supply circuit of the present invention.
Detailed Description
The invention is further described with reference to the accompanying drawings in which:
the invention provides a transregional integrated relay protection system, which is characterized in that: as shown in fig. 1, the substation device comprises a master station device and a slave station device which is connected with the master station device in a communication way;
as shown in fig. 2, the master station apparatus includes a master controller, a setting logic calculation unit communicatively connected to the master controller, and a synchronous clock i communicatively connected to the master controller; the master controller adopts the existing
As shown in fig. 3, the substation device includes an information acquisition unit, a switch, an execution unit, and a synchronous clock ii;
the information acquisition unit comprises a merging unit, a voltage transformer, a current transformer, a temperature sensor, a photosensitive sensor and a gas sensor, wherein the output ends of the voltage transformer, the current transformer, the temperature sensor, the photosensitive sensor and the gas sensor are all connected with the input end of the merging unit; the merging unit, the voltage transformer, the current transformer, the temperature sensor, the photosensitive sensor and the gas sensor are all conventional products, and are not described again;
the merging unit is in communication connection with the execution unit, the execution unit is in communication connection with the switch, the synchronous clock II is in communication connection with the switch, and the switch is in communication connection with the master station device; the communication adopts special optical fiber communication.
The system further comprises a power supply unit, and the power supply unit provides working electricity for the substation device.
The substation device is responsible for collecting real-time power data of protected equipment such as a transformer substation, the power data are preprocessed by the merging unit and then transmitted to the main control device through the switch, and the main control device determines whether the relay needs to be controlled through the intelligent machine or not through setting calculation. Therefore, cross-region integrated relay protection is realized.
The execution unit comprises an intelligent terminal and a relay, the intelligent terminal is in communication connection with the switch, and the relay is in communication connection with the intelligent terminal. The relay and the intelligent terminal are all existing products, and are not described in detail herein.
The power supply adopts an alternating current and direct current dual power supply mode. The double-current power supply ensures that the acquisition unit continuously supplies power without interruption, and can also normally acquire power data even when power failure is detected and repaired, thereby ensuring the reliability of cross-region integrated relay protection.
As shown in fig. 4, the power supply includes an ac power supply unit, a dc power supply unit, and a switching control unit, wherein an input end of the ac power supply unit is connected to the power transmission line, an output end of the ac power supply unit is connected to an input end of the switching control unit, the dc power supply unit is powered by a storage battery, an output end of the dc power supply unit is connected to an input end of the switching control unit, and an output end of the switching control unit is an output end of the power supply.
The switching control unit comprises a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, an operational amplifier U2 and a MOS tube Q4, wherein one end of the resistor R3 is connected with the output end of the alternating current power supply unit, the other end of the resistor R3 is the output end of the power supply unit, one end of a resistor R6 is connected with a common connection point of a resistor R3 and the alternating current power supply unit, the other end of the resistor R6 is grounded through a resistor R7, one end of a resistor R4 is connected with a common connection point of a resistor R3 and the output end, the other end of a resistor R4 is connected with an inverting end of an operational amplifier U2, the same-phase end of an operational amplifier U2 is connected with a common connection point of a resistor R6 and a resistor R6, one end of the resistor R6 is connected with a common connection point of the inverting end of the resistor R6 and the inverting end of the operational amplifier U6, the other end of the resistor R6 is connected with the gate of the MOS tube Q6, the source electrode of the MOS transistor Q4 is connected with the output end of the direct current power supply unit, and the drain electrode of the MOS transistor Q4 is connected with the common connection point of the resistor R3 and the output end;
the MOS transistor Q4 is a P-channel enhancement type MOS transistor.
The power supply mode is double power supply, alternating current power supply is preferred, and when the alternating current power supply fails, a storage battery is adopted for supplying power; the alternating current power supply adopts a current transformer to induce current from a power transmission line, and the current is rectified through a full bridge, filtered through an RC and then output through a voltage follower of an operational amplifier U1;
when the alternating current is normally supplied, current flows through two ends of the resistor R3, the voltage output by the operational amplifier U2 is the voltage drop of two ends of the resistor R3, and through the resistance design of the resistor R3, the MOS transistor Q4 is cut off, namely, the alternating current supplies power to the outside;
when the alternating current is abnormally supplied, no current flows through the two ends of the resistor R3, at the moment, the operational amplifier U2 does not output voltage zero, at the moment, the source voltage of the MOS transistor Q4 is greater than the grid voltage, the MOS transistor Q4 is conducted, and the storage battery supplies power to the outside;
therefore, dual power supplies are realized, and the reliability of data acquisition is ensured.
The alternating current power supply unit comprises a current transformer, a full-bridge rectification circuit, a filter circuit and a protection unit, wherein the input end of the current transformer is connected with a power transmission line, the output end of the current transformer is connected with the input end of the full-bridge rectification, the output end of the full-bridge rectification is connected with the input end of the filter circuit, the protection unit comprises a transient suppression diode and a voltage follower, the transient suppression diode is connected with the input end of the full-bridge rectification in parallel, the voltage follower is operational amplifier U1, the in-phase end of the operational amplifier U1 is connected with the output end of the filter circuit, the inverting end of the operational amplifier U1 is connected with the output end, and the output end of the operational amplifier U1 is connected with the input end of the switching control unit. As shown in fig. 5, the full-bridge rectification adopts an existing diode full-bridge rectification circuit, the filter circuit adopts RC filtering, a resistor R1 and a capacitor C1, one end of the resistor R1 is connected with the positive output end of the full-bridge rectification ZL1, and the other end of the resistor R1 is grounded through a capacitor C1.
The power supply also comprises a voltage-stabilizing output unit, wherein the input end of the voltage-stabilizing output unit is connected with the output end of the alternating current power supply unit, and the output end of the voltage-stabilizing output unit is connected with the input end of the switching control unit;
the voltage stabilizing output unit comprises a piezoresistor RV, a resistor R2, a resistor R10, a voltage stabilizing diode DW1, an MOS tube Q1 and an MOS tube Q2, one end of the piezoresistor RV is connected with the output end of the alternating current power supply unit, the other end of the piezoresistor RV is grounded through a resistor R10, one end of a resistor R2 is connected with the output end of the alternating current power supply unit, the other end of the resistor R2 is connected with the source of the MOS tube Q2, the grid of the MOS tube Q2 is connected with the common connection point of the piezoresistor RV and the resistor R10, the drain of the MOS tube Q1 is connected with the output end of the alternating current power supply unit, the source of the MOS tube Q1 is connected with one end of the resistor R3, the grid of the MOS tube Q1 is connected with the drain of the MOS tube Q2, the cathode of the voltage stabilizing diode DW1 is connected with the common connection point of the drain of the MOS tube Q2 and the grid of the MOS tube Q1, and the anode of the voltage stabilizing diode DW1 is grounded;
the MOS transistor Q1 is an N-channel enhancement type MOS transistor, and the MOS transistor Q2 is a P-channel enhancement type MOS transistor.
The working principle is as follows:
when the voltage is less than or equal to the rated voltage, no current flows through the piezoresistor, namely no voltage exists on the grid of the MOS tube Q2, the source voltage A point of the MOS tube Q2 is connected with the grid voltage, the MOS tube Q2 is connected, the MOS tube Q1 is connected, the grid of the MOS tube Q1 is constant through the voltage stabilizing diode DW1, and according to the characteristics of the MOS tube, when the grid voltage of the MOS tube is stable, the output current is constant, namely the output voltage is constant;
if the input voltage is higher than the preset voltage, the resistance value of the voltage dependent resistor drops suddenly, the resistance value of the voltage dependent resistor is close to zero, the grid voltage of the MOS transistor Q2 is equal to the voltage at the two ends of the resistor R10, the source voltage of the MOS transistor Q2 is lower than the grid voltage of the MOS transistor Q2, the MOS transistor Q2 is cut off, and the MOS transistor Q1 is cut off, so that the outward output is stopped, and a subsequent circuit is protected.
The power supply also comprises an overcurrent self-locking unit, the input end of the overcurrent self-locking unit is connected with the output end of the switching control unit, and the output end of the overcurrent self-locking unit is the output end of the power supply;
the overcurrent self-locking unit comprises a resistor R8, a resistor R9, a comparator U3 and an MOS tube Q3, one end of the resistor R8 is connected with a common connection point of the drains of the resistor R3 and the MOS tube Q3, the other end of the resistor R8 is grounded through the resistor R9, the same-phase end of the comparator U3 is connected with a common connection point of the resistor R8 and the resistor R9, the reverse-phase end of the comparator U3 is connected with a reference voltage REF, the source of the MOS tube Q3 is connected with a common connection point of the resistor R3 and the drain of the MOS tube Q4, the drain of the MOS tube Q3 is an output end, and the gate of the MOS tube Q3 is connected with the output end of the comparator U3;
the MOS transistor Q3 is a P-channel enhancement type MOS transistor.
The working principle is as follows:
by comparing the voltage at two ends of the resistor R9 for collecting current with a preset reference voltage, when the voltage at two ends of the resistor R9 is larger than the preset reference voltage, namely the output current of the power supply is higher than the preset current, the comparator U3 outputs a high level, and the MOS transistor Q3 is cut off, so that the connection with a subsequent circuit is disconnected, and the situation that a large current flows into subsequent equipment to cause irreversible damage is avoided; when the voltage at the two ends of the resistor R9 is not greater than the preset reference voltage, namely the current output by the power supply is normal, the comparator U3 outputs low level, the MOS transistor Q3 is conducted, and the current is output to supply power for subsequent circuits; by the technical scheme, the overcurrent automatic disconnection and the connection of the subsequent circuit can be realized, so that the subsequent circuit is protected.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.

Claims (5)

1. The utility model provides a transregional integration relay protection system which characterized in that: the device comprises a main station device and a substation device which is in communication connection with the main station device, wherein the main station device comprises a main controller, a setting logic calculation unit which is in communication connection with the main controller and a synchronous clock I which is in communication connection with the main controller;
the substation device comprises an information acquisition unit, a switch, an execution unit and a synchronous clock II;
the information acquisition unit comprises a merging unit, a voltage transformer, a current transformer, a temperature sensor, a photosensitive sensor and a gas sensor, wherein the output ends of the voltage transformer, the current transformer, the temperature sensor, the photosensitive sensor and the gas sensor are all connected with the input end of the merging unit;
the merging unit is in communication connection with the execution unit, the execution unit is in communication connection with the switch, the synchronous clock II is in communication connection with the switch, and the switch is in communication connection with the master station device;
the system also comprises a power supply unit, wherein the power supply unit provides working power for the substation device;
the power supply adopts an alternating current and direct current dual power supply mode;
the power supply comprises an alternating current power supply unit, a direct current power supply unit and a switching control unit, wherein the input end of the alternating current power supply unit is connected with a power transmission line, the output end of the alternating current power supply unit is connected with the input end of the switching control unit, the direct current power supply unit adopts a storage battery for supplying power, the output end of the direct current power supply unit is connected with the input end of the switching control unit, and the output end of the switching control unit is the output end of the power supply;
the switching control unit comprises a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, an operational amplifier U2 and a MOS tube Q4, wherein one end of the resistor R3 is connected with the output end of the alternating current power supply unit, the other end of the resistor R3 is the output end of the power supply unit, one end of a resistor R6 is connected with a common connection point of a resistor R3 and the alternating current power supply unit, the other end of the resistor R6 is grounded through a resistor R7, one end of a resistor R4 is connected with a common connection point of a resistor R3 and the output end, the other end of a resistor R4 is connected with an inverting end of an operational amplifier U2, the same-phase end of an operational amplifier U2 is connected with a common connection point of a resistor R6 and a resistor R6, one end of the resistor R6 is connected with a common connection point of the inverting end of the resistor R6 and the inverting end of the operational amplifier U6, the other end of the resistor R6 is connected with the gate of the MOS tube Q6, the source electrode of the MOS transistor Q4 is connected with the output end of the direct current power supply unit, and the drain electrode of the MOS transistor Q4 is connected with the common connection point of the resistor R3 and the output end;
the MOS transistor Q4 is a P-channel enhancement type MOS transistor.
2. The transregional integrated relay protection system of claim 1, wherein: the execution unit comprises an intelligent terminal and a relay, the intelligent terminal is in communication connection with the switch, and the relay is in communication connection with the intelligent terminal.
3. The transregional integrated relay protection system of claim 1, wherein: the alternating current power supply unit comprises a current transformer, a full-bridge rectification circuit, a filter circuit and a protection unit, wherein the input end of the current transformer is connected with a power transmission line, the output end of the current transformer is connected with the input end of the full-bridge rectification, the output end of the full-bridge rectification is connected with the input end of the filter circuit, the protection unit comprises a transient suppression diode and a voltage follower, the transient suppression diode is connected with the input end of the full-bridge rectification in parallel, the voltage follower is operational amplifier U1, the in-phase end of the operational amplifier U1 is connected with the output end of the filter circuit, the inverting end of the operational amplifier U1 is connected with the output end, and the output end of the operational amplifier U1 is connected with the input end of the switching control unit.
4. The transregional integrated relay protection system of claim 1, wherein: the power supply also comprises a voltage-stabilizing output unit, wherein the input end of the voltage-stabilizing output unit is connected with the output end of the alternating current power supply unit, and the output end of the voltage-stabilizing output unit is connected with the input end of the switching control unit;
the voltage stabilizing output unit comprises a piezoresistor RV, a resistor R2, a resistor R10, a voltage stabilizing diode DW1, an MOS tube Q1 and an MOS tube Q2, one end of the piezoresistor RV is connected with the output end of the alternating current power supply unit, the other end of the piezoresistor RV is grounded through a resistor R10, one end of a resistor R2 is connected with the output end of the alternating current power supply unit, the other end of the resistor R2 is connected with the source of the MOS tube Q2, the grid of the MOS tube Q2 is connected with the common connection point of the piezoresistor RV and the resistor R10, the drain of the MOS tube Q1 is connected with the output end of the alternating current power supply unit, the source of the MOS tube Q1 is connected with one end of the resistor R3, the grid of the MOS tube Q1 is connected with the drain of the MOS tube Q2, the cathode of the voltage stabilizing diode DW1 is connected with the common connection point of the drain of the MOS tube Q2 and the grid of the MOS tube Q1, and the anode of the voltage stabilizing diode DW1 is grounded;
the MOS transistor Q1 is an N-channel enhancement type MOS transistor, and the MOS transistor Q2 is a P-channel enhancement type MOS transistor.
5. The transregional integrated relay protection system of claim 1, wherein: the power supply also comprises an overcurrent self-locking unit, the input end of the overcurrent self-locking unit is connected with the output end of the switching control unit, and the output end of the overcurrent self-locking unit is the output end of the power supply;
the overcurrent self-locking unit comprises a resistor R8, a resistor R9, a comparator U3 and an MOS tube Q3, one end of the resistor R8 is connected with a common connection point of the drains of the resistor R3 and the MOS tube Q3, the other end of the resistor R8 is grounded through the resistor R9, the same-phase end of the comparator U3 is connected with a common connection point of the resistor R8 and the resistor R9, the reverse-phase end of the comparator U3 is connected with a reference voltage REF, the source of the MOS tube Q3 is connected with a common connection point of the resistor R3 and the drain of the MOS tube Q4, the drain of the MOS tube Q3 is an output end, and the gate of the MOS tube Q3 is connected with the output end of the comparator U3;
the MOS transistor Q3 is a P-channel enhancement type MOS transistor.
CN201911282471.5A 2019-12-13 2019-12-13 Cross-region integrated relay protection system Active CN111049095B (en)

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US8174268B2 (en) * 2009-07-20 2012-05-08 Consolidated Edison Company Of New York, Inc. Protective relay monitoring system and method of comparing behavior patterns
CN204144934U (en) * 2014-06-24 2015-02-04 国家电网公司 Slicing formula voltage protector
CN204442011U (en) * 2015-01-07 2015-07-01 上海尚能电力工程设计有限公司 Supervisory control system and transformer station
CN209419310U (en) * 2018-12-28 2019-09-20 国家电网有限公司 Power supply monitoring system for Softswitch

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