Secondary protection system for non-power-cut operation of distribution network

Abstract

The invention discloses a distribution network non-power-cut operation secondary protection system, which comprises a safety cloud table and an edge operation gateway, and is characterized in that the safety cloud table is used for detecting the primary side of a distribution network, the edge operation gateway and the safety cloud table transmit data through wireless communication, and the side of the safety cloud table is connected with a circuit breaker; the invention relates to the technical field of secondary protection of a distribution network, in particular to a secondary protection system for operation of a distribution network without power failure, which adopts a platform to systematically display operation data of a generator, including key data such as frequency and phase angle; the device can display the working state of the generator, timely early warning is carried out on phase angle and frequency abnormity of the generator, a relay is started and controlled according to low frequency, generating capacity abnormity and phase angle abnormity, automatic control of the generator is realized, and a novel circuit breaker with an earth leakage protection function is matched to realize an enhanced protection effect on non-power-cut operation of a secondary side.

Description

Technical Field

[0001] The invention relates to the technical field of secondary protection of distribution networks, and in particular to a secondary protection system for non-stop power supply operations of distribution networks. Background Art

[0002] In the operation of modern power distribution networks, secondary equipment is used to measure, control, monitor and protect the primary equipment of the power system. At present, if the protection system of secondary equipment needs to be inspected and maintained, it is necessary to shut down the power supply for operation. Usually, it is necessary to report the operation plan to the operation and maintenance monitoring center and apply for the operation ticket at the same time. The operation is inconvenient and unintelligent, and it is impossible to effectively monitor the operating status of the generator and the equipment on the primary side.

[0003] Moreover, the current air circuit breakers are often controlled by rotating switches. However, in actual applications, the switch control of air switches mainly relies on the thermal deformation of materials to control automatic circuit breaking. However, this structure is prone to material deformation that does not meet the standards during operation, resulting in the problem of failure to properly break the circuit. In-depth research on the above issues led to the creation of this case. Summary of the invention

[0004] In view of the deficiencies of the prior art, the present invention provides a secondary protection system for non-stop operation of a distribution network, which solves the problems of the prior art.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a secondary protection system for non-stop power supply operation of a distribution network, comprising a security cloud meter and an edge computing gateway, wherein the security cloud meter is used to detect the primary side of the distribution network, the edge computing gateway and the security cloud meter transmit data through wireless communication, and a circuit breaker is connected to the security cloud meter side;

[0006] The edge computing gateway stores and processes the data uploaded by the secure cloud table, and collects circuit breaker data and real-time status;

[0007] The detection parameters of the primary side of the safety cloud meter include but are not limited to electrical parameters, four-quadrant electrical quantities, phase angles, power factors and harmonic parameters;

[0008] The edge transport gateway side is built with a distribution network safety IoT platform, which analyzes the data during grounding and ignition abnormal events to form an action value trend analysis during operation protection;

[0009] The circuit breaker is an air circuit breaker with a leakage protection function, and the circuit breaker comprises a protective housing, on which an incoming wiring terminal and a conversion wiring terminal are arranged;

[0010] The protective housing is provided with a switch controller, one side of the switch controller is provided with an incoming line connector, and the switch controller is used to control the circuit breaker;

[0011] The incoming line connector is connected to the incoming wiring terminal, and the switch controller is provided with an outgoing line connector, and the outgoing line connector is connected to the conversion wiring terminal.

[0012] Preferably, the distribution network security IoT platform is constructed with the power edge host as the main body, and the power edge host is constructed using a low-power industrial-grade ARM processor and an embedded Linux operating system.

[0013] Preferably, the power edge host adopts an uplink communication mode, specifically including two communication modes: 1-way full-network GPRS / 3G / 4G wireless communication mode and 2-way Ethernet 10 / 100M.

[0014] Preferably, the working environment of the power edge host is set to temperature: -20°C ~ 55°C; humidity: 0% ~ 93% (no condensation); atmospheric pressure: 70kPa ~ 106kPa; altitude: <2500m.

[0015] Preferably, a leakage detection unit is provided on one side of the circuit breaker, the leakage detection unit is connected to the conversion terminal, and an outlet terminal is provided on one side of the leakage detection unit, and a leakage control push rod is provided on the leakage detection unit to link with the switch controller.

[0016] Preferably, the security cloud meter supports three-phase three-wire and three-phase four-wire systems, and has the function of measuring all power grid parameters including three-phase voltage, three-phase current, active power, reactive power, apparent power, power factor, and system frequency, as well as an electrical parameter out-of-limit alarm function.

[0017] Preferably, the incoming line connector includes an incoming line coil; the incoming line coil is connected to the inner end of the incoming line terminal, the incoming line coil is fixed in the protective shell through a support frame, the bottom of the incoming line coil is connected to a power connection plate, a telescopic reset rod is arranged in the incoming line coil, and the telescopic reset rod cooperates with the switch controller.

[0018] Preferably, the outlet connector includes a supporting rod; a power connection ring is provided at the end of the supporting rod, the power connection ring is connected to the transfer terminal, the power connection ring is fixed to one side of the switch controller through an insulating bracket, and the power connection ring can slide axially on the supporting rod.

[0019] Preferably, the switch controller comprises a rotating seat; the protective housing is provided with a rotating seat, a rotating shaft is movably mounted on the rotating seat, an insertion slot is provided at the inner end of the rotating shaft, an adapter sheet is provided in the insertion slot and wrapped and in contact with the power connection ring;

[0020] The rotating shaft is provided with an installation groove corresponding to the telescopic reset rod, the installation groove is provided with an elastic limiter, a fixed ring sleeve is provided in the protective shell, the rotating shaft passes through the fixed ring sleeve, a card slot is provided on the fixed ring sleeve to cooperate with the elastic limiter, and the telescopic end of the telescopic reset rod corresponds to the elastic limiter;

[0021] A rotating knob is arranged at the end of the rotating shaft. The rotating knob is a knob with an indication function and is made of insulating rubber material. A traction spring is movably connected to one side of the outer shaft of the rotating shaft.

[0022] Preferably, an arc grid is provided in the protective shell, the arc grid is composed of rectangular steel sheets arranged in a linear array with intervals, and the arc grid is separately connected to the protective shell by screws.

[0023] Beneficial Effects

[0024] The present invention provides a secondary protection system for non-stop power supply operation of distribution network. It has the following beneficial effects: the secondary protection system for non-stop power supply operation of distribution network adopts a platform to systematically display the operation data of the generator, including key data such as frequency and phase angle; it displays the working status of the generator, timely warns the abnormal phase angle and frequency of the generator, and starts the control relay for low frequency, abnormal power generation and abnormal phase angle to realize automatic control of the generator, and cooperates with a new type of circuit breaker with leakage protection function to realize the enhanced protection effect of non-stop power supply operation on the secondary side. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a first three-dimensional structural schematic diagram of a secondary protection system for non-stop operation of a distribution network described in the present invention.

[0026] Figure 2 It is a schematic cross-sectional structural diagram of a secondary protection system for non-stop operation of a distribution network described in the present invention.

[0027] Figure 3 This is a second three-dimensional structural schematic diagram of a secondary protection system for non-stop operation of a distribution network described in the present invention.

[0028] In the figure: 1. protective shell; 2. incoming wiring terminal; 3. conversion wiring terminal; 4. switch controller; 5. incoming line connector; 6. outgoing line connector; 7. leakage detection unit; 8. outgoing line terminal; 9. arc grid; 51. incoming line coil; 52. power connection plate; 53. telescopic reset rod; 61. supporting plug rod; 62. power connection ring; 63. insulating bracket; 41. rotating seat; 42. rotating shaft; 43. insertion slot; 44. adapter plate; 45. fixing ring sleeve; 46. elastic limiter; 47. rotating knob; 48. slot. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figure 1-3 The present invention provides an implementation scheme: At the current stage, if the protection system needs to be inspected and maintained in the secondary equipment, it is necessary to shut down the power supply for the operation. Usually, it is necessary to report the operation plan to the operation and maintenance monitoring center and apply for an operation ticket at the same time. The operation is inconvenient and unintelligent, and it is impossible to effectively monitor the operating status of the generator and the equipment on the primary side.

[0031] In order to solve the above problems, the present application discloses a secondary protection system for non-stop operation of distribution network. Due to the limitation of system application scenarios, it is required to target the generator connected to the grid on the low-voltage side, and the distance between the generator grid-connected switch and the low-voltage power switch shall not exceed 500 meters, a security cloud meter and an edge computing gateway. The security cloud meter is used to detect the primary side of the distribution network. A circuit breaker is connected to the security cloud meter side. Then, the edge computing gateway and the security cloud meter transmit data through wireless communication, and the data of the security cloud meter is received and calculated through the edge computing gateway.

[0032] Furthermore, the edge computing gateway stores and processes the data uploaded by the secure cloud meter, collects circuit breaker data and real-time status, and focuses on data processing (mainly real-time leakage value) of abnormal grounding and ignition events that may occur during the working process;

[0033] The detection parameters of the primary side of the safety cloud meter include but are not limited to electrical parameters, four-quadrant electrical quantities, phase angles, power factors and harmonic parameters. The safety cloud meter supports three-phase three-wire and three-phase four-wire systems, and has the function of measuring the full grid parameters of three-phase voltage, three-phase current, active power, reactive power, apparent power, power factor and system frequency. It also has the function of alarming for electrical parameter out-of-limit.

[0034] The safety cloud meter is used to detect line voltage, current, leakage and other electrical parameters. It uses 14-bit high-precision AD acquisition, calculates relevant protection information data through FFT transformation and uploads it to the cloud platform. The platform collects leakage, overload, short circuit and other data and performs statistical analysis, remotely links the corresponding protection device to operate, and forms a trend curve. The terminal monitors the line operation in real time. The cloud platform receives the abnormal line conditions (leakage, overload, short circuit) detected by the terminal, and performs protection actions after secondary review combined with trend analysis, continuously optimizes the action judgment criteria, and realizes coordinated protection actions between the cloud platform and the terminal;

[0035] A distribution network safety IoT platform is built on the edge transport gateway side. The distribution network safety IoT platform analyzes the data of abnormal grounding and ignition events to form an action value trend analysis during operation protection. Through the platform's data analysis of events and scenarios (secondary operations, bypass operations, and contact operations), the protection action values ​​of switches such as bypass and contact are more reasonably optimized, realizing the fixed value application of scenario-based operations and achieving better protection effects.

[0036] According to the instruction manual Figure 1-3 It can be seen that the above-mentioned circuit breaker is an air circuit breaker with a leakage protection function, which realizes the protection tripping of grounding, sparking, etc. that may occur during live working, and protects people and equipment. The circuit breaker includes a protective shell 1, and the protective shell 1 is provided with an incoming wiring terminal 2 and a conversion wiring terminal 3. The protective shell 1 is provided with a switch controller 4, and one side of the switch controller 4 is provided with an incoming line connector 5. The switch controller 4 is used to control the circuit breaker, and the incoming line connector 5 is connected to the incoming wiring terminal 2. The switch controller 4 is provided with an outgoing line connector 6, and the outgoing line connector 6 is connected to the conversion wiring terminal 3;

[0037] In the specific implementation process, the circuit breaker uses the switch controller 4 as the control body, uses the incoming line connector 5 to connect the incoming line terminal 2 to achieve the connectivity of the incoming line, and uses the outgoing connector to connect the conversion terminal 3. The switch controller 4 controls the connection and disconnection of the incoming line connector 5 and the outgoing connector, thereby realizing the control of the circuit breaker.

[0038] The distribution network security IoT platform is built with the power edge host as the main body. The power edge host is built with a low-power industrial-grade ARM processor and an embedded Linux operating system. The power edge host adopts an uplink communication mode, specifically one full-network GPRS / 3G / 4G wireless communication mode and two Ethernet 10 / 100M communication modes. The working environment of the power edge host is set to temperature: -20℃~55℃; humidity: 0%~93% (no condensation); atmospheric pressure: 70kPa~106kPa; altitude: <2500m.

[0039] According to the instruction manual Figure 1-3 It can be seen that a leakage detection unit 7 is provided on one side of the circuit breaker, the leakage detection unit 7 is connected to the conversion terminal 3, and an outlet terminal 8 is provided on one side of the leakage detection unit 7, and a leakage control push rod is provided on the leakage detection unit 7 to be linked with the switch controller 4;

[0040] In the specific implementation process, the output terminal 8 on the leakage detection unit 7 is connected to the external circuit, and then the leakage detection unit 7 is used to detect the leakage parameters of the external circuit, and the leakage control push rod is controlled according to the leakage parameters, so that the switch controller 4 completes the leakage short circuit.

[0041] According to the instruction manual Figure 1-3 It can be seen that the above-mentioned incoming line connector 5 includes an incoming line coil 51; the incoming line coil 51 is connected to the inner end of the incoming line terminal 2, the incoming line coil 51 is fixed in the protective shell 1 through a support frame, and the bottom of the incoming line coil 51 is connected to a power connection plate 52, and a telescopic reset rod 53 is arranged in the incoming line coil 51, and the telescopic reset rod 53 cooperates with the switch controller 4. In the specific implementation process, the incoming line coil 51 is connected to the incoming line terminal 2, so that the incoming line coil 51 generates a magnetic field, and the magnetic force of the incoming line coil 51 changes according to the load size and the short-circuit current, so that the telescopic end of the telescopic reset rod 53 moves and cooperates with the switch controller 4 to complete the circuit breaking.

[0042] According to the instruction manual Figure 1-3 It can be seen that the above-mentioned outlet connector 6 includes a supporting rod 61; a power connection ring 62 is provided at the end of the supporting rod 61, and the power connection ring 62 is connected to the transfer terminal. The power connection ring 62 is fixed to one side of the switch controller 4 through an insulating bracket 63. The power connection ring 62 can slide axially on the supporting rod 61. In the specific implementation process, the supporting rod 61 is used to install and limit the power connection ring 62. The power connection ring 62 is connected to the transfer terminal so that the current passes through one side of the leakage detection unit 7. The power connection ring 62 ensures that it is always connected to the switch controller 4 when in use. At the same time, since the power connection ring 62 can slide on the supporting rod 61, the position of the power connection ring 62 can be adjusted, which is convenient for disassembly and assembly.

[0043] According to the instruction manual Figure 1-3 It can be seen that the switch controller 4 includes a rotating seat 41; the protective housing 1 is provided with the rotating seat 41, and a rotating shaft 42 is movably mounted on the rotating seat 41, and an insertion slot 43 is opened at the inner end of the rotating shaft 42, and an adapter sheet 44 is provided in the insertion slot 43 to wrap and contact with the power connection ring 62;

[0044] In the specific implementation process, the rotating shaft 42 can be limited by the rotating seat 41 to rotate, and the connection piece on the insertion slot 43 wraps the power connection ring 62 and the two are in contact to achieve connection with the transfer terminal, and then by controlling the posture of the rotating shaft 42, the adapter piece 44 is brought into contact with the power connection piece 52, thereby achieving connectivity between the input and output.

[0045] In order to prevent the trigger switch from getting stuck during operation, in addition to using the rotating shaft 42 structure to improve the smoothness of operation, a fixed ring sleeve 45 is provided in the protective shell 1, and the rotating shaft 42 passes through the fixed ring sleeve 45. The rotating shaft 42 is installed and limited by the fixed ring sleeve 45 and the rotating seat 41. At the same time, a mounting groove is provided on the rotating shaft 42 corresponding to the telescopic reset rod 53, and an elastic limiting member 46 is provided on the mounting groove. The telescopic end of the telescopic reset rod 53 corresponds to the elastic limiting member 46. When the circuit is disconnected, a card slot 48 is provided on the fixed ring sleeve 45 to cooperate with the elastic limiting member 46. When the circuit is disconnected, During operation, the telescopic end of the telescopic reset rod 53 pushes the elastic limit piece 46 out of the slot 48 under the action of the connecting coil, so that the rotating shaft 42 is separated from the limit of the elastic limit piece 46. A rotating knob 47 is provided at the end of the rotating shaft 42. The rotating knob 47 is a knob with an indication function made of insulating rubber material. The rotating shaft 42 can be rotated by rotating the knob 47, so that the rotating shaft 42 drives the adapter plate 44 to rotate, so that the adapter plate 44 contacts the power connecting plate 52, and the circuit is connected. A traction spring is movably connected to one side of the outer shaft of the rotating shaft 42, and the traction spring is used to assist the resetting of the rotating shaft 42.

[0046] According to the instruction manual Figure 1-3 It can be seen that an arc grid 9 is arranged in the above-mentioned protective shell 1. The arc grid 9 is composed of rectangular steel sheets arranged in a linear array with intervals. The arc grid 9 is separately connected to the protective shell 1 by screws. In the specific implementation process, the arc generated during the circuit breaker is cut off by the isolation effect of the arc grid 9 to avoid the generation of a large arc.

[0047] To sum up, it can be seen that the secondary protection system for non-stop operation of the distribution network uses a platform to systematically display the operating data of the generator, including key data such as frequency and phase angle; display the working status of the generator, and timely warn of abnormal phase angle and frequency of the generator, and start the control relay to realize automatic control of the generator due to low frequency, abnormal power generation and abnormal phase angle, and cooperate with the new circuit breaker with leakage protection function to achieve enhanced protection effect for non-stop operation on the secondary side.

[0048] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A secondary protection system for non-stop power supply operation of a distribution network, comprising a security cloud meter and an edge computing gateway, wherein the security cloud meter is used to detect the primary side of the distribution network, and the edge computing gateway and the security cloud meter transmit data via wireless communication, characterized in that: The safety cloud meter side is connected to a circuit breaker; The edge computing gateway stores and processes the data uploaded by the secure cloud table, and collects circuit breaker data and real-time status; The detection parameters of the primary side of the safety cloud meter include but are not limited to electrical parameters, four-quadrant electrical quantities, phase angles, power factors and harmonic parameters; The edge transport gateway side is built with a distribution network safety IoT platform, which analyzes the data during grounding and ignition abnormal events to form an action value trend analysis during operation protection; The circuit breaker is an air circuit breaker with a leakage protection function, and comprises a protective housing (1), on which an incoming wiring terminal (2) and a conversion wiring terminal (3) are arranged; The protective housing (1) is provided with a switch controller (4), one side of the switch controller (4) is provided with an incoming line connector (5), and the switch controller (4) is used to control circuit breaking; The incoming line connector (5) is connected to the incoming line terminal (2), and the switch controller (4) is provided with an outgoing line connector (6), and the outgoing line connector (6) is connected to the conversion terminal (3).

2. A secondary protection system for non-stop operation of distribution network according to claim 1, characterized in that: The distribution network security IoT platform is built with the power edge host as the main body, and the power edge host is built with a low-power industrial-grade ARM processor and an embedded Linux operating system.

3. A secondary protection system for non-stop operation of distribution network according to claim 2, characterized in that: The power edge host adopts an uplink communication mode, specifically including 1-way full-network GPRS / 3G / 4G wireless communication mode and 2-way Ethernet 10 / 100M communication modes.

4. A secondary protection system for non-stop operation of distribution network according to claim 3, characterized in that: The working environment of the power edge host is set to a temperature of -20°C to 55°C; Humidity: 0%~93% (no condensation); Atmospheric pressure: 70kPa~106kPa; Altitude: <2500m.

5. A secondary protection system for non-stop operation of distribution network according to claim 4, characterized in that: A leakage detection unit (7) is provided on one side of the circuit breaker, the leakage detection unit (7) is connected to the conversion terminal (3), and an outlet terminal (8) is provided on one side of the leakage detection unit (7). A leakage control push rod is provided on the leakage detection unit (7) and is linked to the switch controller (4).

6. A secondary protection system for non-stop operation of distribution network according to claim 5, characterized in that: The security cloud meter supports three-phase three-wire and three-phase four-wire systems, and has the function of measuring all power grid parameters including three-phase voltage, three-phase current, active power, reactive power, apparent power, power factor, and system frequency, and also has the function of alarming for electrical parameter exceeding the limit.

7. A secondary protection system for non-stop operation of distribution network according to claim 6, characterized in that: The incoming line connector (5) comprises an incoming line coil (51); the incoming line coil (51) is connected to the inner end of the incoming line terminal (2); the incoming line coil (51) is fixed in the protective housing (1) through a support frame; the bottom of the incoming line coil (51) is connected to a power connection plate (52); a telescopic reset rod (53) is arranged in the incoming line coil (51); the telescopic reset rod (53) cooperates with the switch controller (4).

8. A secondary protection system for non-stop operation of distribution network according to claim 7, characterized in that: The outlet connector (6) comprises a supporting plug rod (61); an electric connection ring (62) is provided at the end of the supporting plug rod (61); the electric connection ring (62) is connected to the transfer terminal; the electric connection ring (62) is fixed to one side of the switch controller (4) through an insulating bracket (63); and the electric connection ring (62) can slide axially on the supporting plug rod (61).

9. A secondary protection system for non-stop operation of distribution network according to claim 8, characterized in that: The switch controller (4) comprises a rotating seat (41); the protective housing (1) is provided with a rotating seat (41), a rotating shaft (42) is movably mounted on the rotating seat (41), an insertion slot (43) is provided at the inner end of the rotating shaft (42), an adapter sheet (44) is provided in the insertion slot (43) and wrapped therein and in contact with the power connection ring (62); The rotating shaft (42) is provided with a mounting groove corresponding to the telescopic reset rod (53), the mounting groove is provided with an elastic limiter (46), a fixing ring sleeve (45) is provided in the protective shell (1), the rotating shaft (42) passes through the fixing ring sleeve (45), the fixing ring sleeve (45) is provided with a slot (48) matched with the elastic limiter (46), and the telescopic end of the telescopic reset rod (53) corresponds to the elastic limiter (46); A rotating knob (47) is provided at the end of the rotating shaft (42). The rotating knob (47) is a knob with an indication function and is made of insulating rubber material. A traction spring is movably connected to one side of the outer shaft of the rotating shaft (42).

10. A secondary protection system for non-stop operation of distribution network according to claim 9, characterized in that: An arc grid (9) is arranged in the protective housing (1); the arc grid (9) is composed of rectangular steel sheets arranged in a linear array with intervals; the arc grid (9) is separately connected to the protective housing (1) by screws.

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