CN110535116B - Arc extinction cabinet and low-current grounding system - Google Patents
Arc extinction cabinet and low-current grounding system Download PDFInfo
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- CN110535116B CN110535116B CN201910853427.9A CN201910853427A CN110535116B CN 110535116 B CN110535116 B CN 110535116B CN 201910853427 A CN201910853427 A CN 201910853427A CN 110535116 B CN110535116 B CN 110535116B
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- 230000008033 biological extinction Effects 0.000 title description 5
- 238000005070 sampling Methods 0.000 claims abstract description 37
- 230000001629 suppression Effects 0.000 claims abstract description 28
- 238000009413 insulation Methods 0.000 claims abstract description 10
- 238000012544 monitoring process Methods 0.000 claims abstract description 9
- 230000001012 protector Effects 0.000 claims description 12
- 230000016507 interphase Effects 0.000 claims description 11
- 238000010891 electric arc Methods 0.000 abstract description 7
- 230000002401 inhibitory effect Effects 0.000 description 8
- 239000004020 conductor Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000007935 neutral effect Effects 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 238000002955 isolation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/16—Earthing arrangements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/263—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of measured values
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The application discloses an arc suppression cabinet and a low-current grounding system, wherein the arc suppression cabinet is provided with a switching device and a low-current grounding line selection device, and the low-current grounding line selection device is used for conducting insulation monitoring sampling on three-phase voltages acquired by a first voltage transformer group through a first input end and sampling the zero-sequence current of a total incoming line cabinet through a second input end; and the switching device is used for determining fault phases and fault types according to the voltage exceeding the first preset value and/or the zero sequence current exceeding the second preset value when any one phase voltage in the three-phase voltages exceeds the first preset value and/or the zero sequence current exceeding the second preset value, and controlling the switching device to switch the resistive load on the branch corresponding to the fault, so that when a single-phase grounding fault occurs, the resistive load is switched on the branch corresponding to the fault, the grounding current becomes resistive-capacitive grounding current, the amplitude of the overvoltage of the power grid is restrained, the arc discharge generated at the single-phase grounding fault point is restrained, and the safe and stable operation of the power system is ensured.
Description
Technical Field
The application relates to the technical field of power equipment, in particular to an arc extinction cabinet and a small-current grounding system.
Background
At present, in 10kV equal-voltage distribution networks in China, most distribution networks are small-current grounding systems in order to improve the power supply reliability of power systems, and the small-current grounding systems refer to three-phase systems with neutral points not grounded or grounded through arc suppression coils and high impedance, and are also called neutral point indirect grounding systems. When a phase fails to ground, the ground fault current tends to be much less than the load current, and such a system is referred to as a "low current ground system" because a short circuit loop cannot be constructed.
In a small-current grounding system, when a single-phase reliable grounding fault occurs on a high-voltage side, the fault phase voltage of the high-voltage side is only 0V, and a lower induced voltage can be generated on a phase line corresponding to a low-voltage side, so that single-phase electrical equipment connected to the phase line cannot work normally. At this time, the three-phase equipment electrically connected with the high-voltage side or the low-voltage side and the single-phase electrical equipment connected with the other two phases corresponding to the low-voltage side can still operate for 2 hours, and meanwhile, the insulation monitoring device alarms, so that the operators can have enough time to handle faults, and further, the power supply is ensured to be uninterrupted as much as possible. If the single-phase grounding fault does not disappear after 2 hours, the system considers the grounding fault to be a permanent fault, and relay protection can act on the circuit breaker to trip for fault isolation in order to prevent the single-phase grounding fault from developing into a two-phase grounding short circuit or an inter-phase short circuit fault.
However, when the overhead insulated conductor and the overhead bare conductor are lapped on the ground surface after being broken, the overhead insulated conductor and the overhead bare conductor are not reliably grounded, and meanwhile, the end of the conductor and the ground surface have very high voltage difference, so that strong current finally discharges to the ground surface through the end of the conductor, synchronous burning and arc extinction are generated, the brightness is very strong, and the temperature is very high, and the phenomenon is also called arc grounding. And the capacitance current per phase is generated in the grounding wire when the grounding wire is nearly 3 times of normal operation, so that the generated ampere force (ampere force F= BILsin θ) enables the wire to swing left and right and is accompanied by intermittent arc discharge, the surrounding crowd and equipment are greatly damaged, if the duration time is long, power system resonance is generated, and safety accidents such as power equipment burnout and power failure in an extended range are caused.
Disclosure of Invention
In order to solve the technical problems, the application provides an arc suppression cabinet and a small-current grounding system, so as to achieve the purposes of suppressing arc discharge generated at a single-phase grounding fault point and ensuring safe and stable operation of a power system.
In order to achieve the technical purpose, the embodiment of the application provides the following technical scheme:
An arc suppression cabinet is applied to a low-current grounding system, and the low-current grounding system comprises a total wire inlet cabinet and a plurality of wire inlet cabinets which are connected in parallel with a bus; the arc suppression cabinet includes: the switching device and the low-current grounding line selection device; wherein,
The first input end of the low-current grounding line selection device is connected with the sampling output end of the switching device, the second input end of the low-current grounding line selection device is connected with the total incoming line cabinet, and the first output end of the low-current grounding line selection device is connected with the switching input end of the switching device;
The first voltage transformer of the switching device is used for collecting three-phase voltages of the bus;
the low-current grounding line selection device is used for conducting insulation monitoring sampling on the three-phase voltage collected by the first voltage transformer group through the first input end and sampling the zero-sequence current of the total incoming line cabinet through the second input end; and the switching device is used for determining a fault phase and a fault type according to the voltage exceeding the first preset value and/or the zero sequence current exceeding the second preset value when any one phase voltage in the three-phase voltage exceeds the first preset value and/or the zero sequence current exceeds the second preset value, and controlling the switching device to switch the resistive load on a branch corresponding to the fault.
Optionally, the arc suppression cabinet further includes: the feeder microcomputer protection device comprises a first vacuum circuit breaker, a first current transformer group and a feeder microcomputer protection device; wherein,
The first vacuum circuit breaker and the first current transformer group are connected in series to one side of the switching device, which faces the bus;
The first sampling end of the feeder microcomputer protection device is connected with the first current transformer group, the second sampling end of the feeder microcomputer protection device is connected with the first voltage transformer of the switching device, and the control output end of the feeder microcomputer protection device is connected with the first vacuum circuit breaker;
the feeder microcomputer protection device is used for sampling three-phase current collected by the first current transformer group through the first sampling end, sampling three-phase voltage collected by the first voltage transformer through the second sampling end, determining whether interphase short-circuit faults occur according to the three-phase current collected by the first current transformer group and the three-phase voltage collected by the first voltage transformer, and controlling the first vacuum circuit breaker to trip when the interphase short-circuit faults occur.
Optionally, the low-current grounding line selection device controls the switching device to switch the resistive load to the branch corresponding to the fault, and is specifically configured to send a closing instruction to the switching device, so that the switching device switches the resistive load to the branch corresponding to the fault;
the low-current grounding line selection device is also used for sending a disconnection instruction to the switching device when the branch fault corresponding to the fault is eliminated, so that the switching device stops switching the resistive load.
Optionally, the switching device includes: the device comprises a first charged display, a switching unit, a voltage transformer group, an overvoltage protector, a primary harmonic eliminator and a fuse; wherein,
One end of the first charge display is connected with one end of the first current transformer group, which is far away from the vacuum circuit breaker, and the other end of the first charge display is grounded;
One end of the switching unit is connected with one end of the first current transformer group, which is far away from the vacuum circuit breaker, and the other end of the switching unit is grounded; the switching unit comprises three switching branches, and each switching branch is composed of a single-phase alternating-current vacuum contactor, a phase current transformer and a resistor which are sequentially connected in series;
one end of the fuse is connected with one end, far away from the vacuum circuit breaker, of the first current transformer group, and the other end of the fuse is connected with the voltage transformer group; the voltage transformer group is far away from the fuse and is connected with the primary harmonic eliminator; one end of the primary harmonic eliminator, which is far away from the voltage transformer group, is grounded;
One end of the overvoltage protector is connected with one end of the first current transformer group, which is far away from the vacuum circuit breaker, and the other end of the overvoltage protector is grounded;
The single-phase alternating current vacuum contactor is closed when receiving a closing instruction of the low-current grounding line selection device, so that capacitive load is input to a switching branch where the unidirectional alternating current vacuum contactor is located, and the single-phase alternating current vacuum contactor is disconnected when receiving a disconnection instruction of the low-current grounding line selection device.
A low current grounding system comprising: a bus, a main incoming line cabinet connected with the bus in parallel an arc extinguishing cabinet and a plurality of feeder cabinets;
the arc extinguishing cabinet is any one of the arc extinguishing cabinets.
Optionally, the total incoming line cabinet includes: the second vacuum circuit breaker, the second current transformer, the second live display, the first lightning arrester and the first zero sequence current transformer; wherein,
One end of the second vacuum circuit breaker is connected with the bus, and the other end of the second vacuum circuit breaker is connected with the second current transformer;
One end of the second electrified display is connected with one end of the second current transformer far away from the second vacuum circuit breaker, and the other end of the second electrified display is grounded;
one end of the first lightning arrester is connected with one end of the second current transformer far away from the second vacuum circuit breaker, and the other end of the first lightning arrester is grounded;
One end of the first zero sequence current transformer is connected with one end, far away from the second vacuum circuit breaker, of the second current transformer, and the other end of the first zero sequence current transformer is connected with a second input end of the low-current grounding line selection device of the arc suppression cabinet.
Optionally, the feeder cabinet includes: the third vacuum circuit breaker, the third current transformer, the third live display, the grounding switch, the second lightning arrester and the second zero sequence current transformer; wherein,
One end of the third vacuum circuit breaker is connected with the bus, and the other end of the third vacuum circuit breaker is connected with the third current transformer;
one end of the third electrified display is connected with one end of the third current transformer far away from the third vacuum circuit breaker, and the other end of the third electrified display is grounded;
One end of the second lightning arrester is connected with one end of the third current transformer far away from the third vacuum circuit breaker, and the other end of the second lightning arrester is grounded;
one end of the second zero sequence current transformer is connected with one end of the third current transformer far away from the third vacuum circuit breaker.
As can be seen from the above technical solution, the embodiments of the present application provide an arc suppression cabinet and a low-current grounding system, where the arc suppression cabinet has a switching device and a low-current grounding line selection device, where the low-current grounding line selection device is configured to perform insulation monitoring sampling on three-phase voltages collected by the first voltage transformer group through the first input end, and sample zero-sequence current of the total line distribution cabinet through the second input end; and the switching device is used for determining fault phases and fault types according to the voltage exceeding a first preset value and/or the zero sequence current exceeding a second preset value when any one phase voltage in the three-phase voltages exceeds the first preset value and/or the zero sequence current exceeding the second preset value, and controlling the switching device to switch the resistive load on the branch corresponding to the fault, so that when a single-phase grounding fault occurs, the resistive load is switched on the branch corresponding to the fault, and the grounding current becomes resistive-capacitive grounding current, thereby inhibiting the amplitude of the overvoltage of the power grid, realizing the purposes of inhibiting arc discharge at the single-phase grounding fault point and ensuring the safe and stable operation of the power system.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an arc suppression cabinet and a low-current grounding system according to an embodiment of the present application;
Fig. 2 is a schematic structural diagram of an arc suppression cabinet and a low-current grounding system according to another embodiment of the present application;
Fig. 3 is a schematic structural diagram of an overall incoming line cabinet according to an embodiment of the present application;
Fig. 4 is a schematic structural diagram of a feeder cabinet according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The embodiment of the application provides an arc extinction cabinet, which is applied to a low-current grounding system, wherein the low-current grounding system comprises a total wire inlet cabinet 20 and a plurality of wire inlet cabinets 30 which are connected in parallel with a bus 40; the arc extinguishing cabinet 10 includes: the switching device 13 and the low-current grounding line selection device 14; as shown in fig. 1, the arc suppression cabinet 10 includes: the switching device 13 and the low-current grounding line selection device 14; wherein,
The first input end of the low-current grounding line selection device 14 is connected with the sampling output end of the switching device 13, the second input end of the low-current grounding line selection device 14 is connected with the main incoming line cabinet 20, and the first output end of the low-current grounding line selection device 14 is connected with the switching input end of the switching device 13;
The first voltage transformer of the switching device 13 is used for collecting three-phase voltages of the bus 40;
The low-current grounding line selection device 14 is configured to perform insulation monitoring sampling on the three-phase voltage collected by the first voltage transformer set through the first input end, and sample the zero-sequence current of the total incoming line cabinet 20 through the second input end; and the switching device 13 is used for determining a fault phase and a fault type according to the voltage exceeding the first preset value and/or the zero sequence current exceeding the second preset value when any one phase voltage in the three-phase voltages exceeds the first preset value and/or the zero sequence current exceeds the second preset value, and controlling the switching device 13 to switch the resistive load on a branch corresponding to the fault.
In this embodiment, the arc suppression cabinet 10 has a switching device 13 and a low-current grounding line selection device 14, where the low-current grounding line selection device 14 is configured to perform insulation monitoring sampling on the three-phase voltages collected by the first voltage transformer group through the first input end, and sample the zero-sequence current of the total line incoming cabinet 20 through the second input end; and the switching device 13 is used for determining a fault phase and a fault type according to the voltage exceeding a first preset value and/or the zero sequence current exceeding a second preset value when any one phase voltage in the three-phase voltages exceeds the first preset value and/or the zero sequence current exceeding the second preset value, and controlling the switching device 13 to switch the resistive load on a branch corresponding to the fault so as to switch the resistive load on the branch corresponding to the fault when the single-phase grounding fault occurs, so that the grounding current becomes resistive-capacitive grounding current, thereby inhibiting the amplitude of the overvoltage of the power grid, realizing the purposes of inhibiting the arc discharge generated at the single-phase grounding fault point and ensuring the safe and stable operation of the power system.
In an optional embodiment of the application, the low-current grounding line selection device is further used for sending out alarm information after determining the fault phase and the fault type.
On the basis of the above-described embodiments, in one embodiment of the present application, still referring to fig. 1, the arc suppression cabinet 10 further includes: a first vacuum circuit breaker 11, a first current transformer group 12 and a feeder microcomputer protection device 15; wherein,
The first vacuum circuit breaker 11 and the first current transformer group 12 are connected in series to one side of the switching device 13 facing the bus 40;
A first sampling end of the feeder microcomputer protection device 15 is connected with the first current transformer group 12, a second sampling end of the feeder microcomputer protection device 15 is connected with a first voltage transformer of the switching device 13, and a control output end of the feeder microcomputer protection device 15 is connected with the first vacuum circuit breaker 11;
The feeder microcomputer protection device 15 is configured to sample the three-phase current collected by the first current transformer set 12 through the first sampling end, sample the three-phase voltage collected by the first voltage transformer through the second sampling end, and determine whether an interphase short-circuit fault occurs according to the three-phase current collected by the first current transformer set 12 and the three-phase voltage collected by the first voltage transformer, and control the first vacuum circuit breaker 11 to trip when the interphase short-circuit fault occurs.
Wherein, optionally, the model of the low-current grounding line selection device 14 can be HD-NSL200; the first vacuum circuit breaker 11 may be a 12kV vacuum circuit breaker cart 1250A31.5Ka/4S spring mechanism; the first current transformer group 12 comprises three current transformers for measuring three-phase currents, and the current transformers can be of the type LZZBJ9-10 400/5P 20 30VA.
In this embodiment, the feeder microcomputer protection device 15 is matched with the first vacuum circuit breaker 11 and the first current transformer group 12 to monitor whether the equipment in the arc suppression cabinet 10 has interphase equal short-circuit faults, and operates on the first vacuum circuit breaker 11 to trip when the faults occur.
Alternatively, the feeder microcomputer protection device 15 may be of the CSC281 type.
Optionally, the low-current grounding line selection device 14 is configured to control the switching device 13 to switch the resistive load to the branch corresponding to the fault, and specifically is configured to send a closing instruction to the switching device 13, so that the switching device 13 switches the resistive load to the branch corresponding to the fault;
The low-current grounding line selection device 14 is further configured to send an opening instruction to the switching device 13 when the branch fault corresponding to the fault is eliminated, so that the switching device 13 stops switching the resistive load.
The closing command and the opening command may be a high level command or a low level command, respectively, or may be PWM wave commands having different duty ratios, or the like. The present application is not limited thereto, and is specifically applicable as the case may be.
Optionally, referring to fig. 2, the switching device 13 includes: a first charged display 131, a switching unit, a voltage transformer group 137, an overvoltage protector 136, a primary detuner 138, and a fuse 135; wherein,
One end of the first charge display 131 is connected with one end of the first current transformer group 12 far away from the vacuum circuit breaker, and the other end is grounded;
one end of the switching unit is connected with one end of the first current transformer group 12 far away from the vacuum circuit breaker, and the other end of the switching unit is grounded; the switching unit comprises three switching branches, and each switching branch is composed of a single-phase alternating-current vacuum contactor 132, a phase current transformer 133 and a resistor 134 which are sequentially connected in series;
One end of the fuse 135 is connected with one end of the first current transformer group 12 far away from the vacuum circuit breaker, and the other end is connected with the voltage transformer group 137; the voltage transformer group 137 is connected with the primary harmonic eliminator 138 far away from the fuse 135; one end of the primary harmonic eliminator 138, which is far from the voltage transformer group 137, is grounded;
One end of the overvoltage protector 136 is connected with one end of the first current transformer group 12 far away from the vacuum circuit breaker, and the other end is grounded;
the single-phase ac vacuum contactor 132 is closed when receiving the closing instruction of the low-current grounding line selection device 14, so as to put a capacitive load on the switching branch where the single-phase ac vacuum contactor is located, and is opened when receiving the opening instruction of the low-current grounding line selection device 14.
Wherein, optionally, the model of the first charged display 131 may be DXN-12Q;
The voltage transformer group 137 comprises three voltage transformers for respectively detecting three-phase voltages, and the types of the voltage transformers can be JDZ10-10A 10/. V3/0.1/3 kV;
the model of the overvoltage protector 136 can be TBP-12.7/35kV;
The primary detuner 138 may be of the type LXQ-10 (strongly insulated);
the resistor 134 may be 10kV/100 Ω (stainless steel);
The type of the fuse 135 may be a high voltage fuse 135XNP a-12/0.5A.
Correspondingly, the embodiment of the application also provides a small-current grounding system, still referring to fig. 1, including: a bus bar 40, an overall feeder cabinet 20 connected in parallel with the bus bar 40, an arc extinguishing cabinet 10, and a plurality of feeder cabinets 30;
The arc extinguishing cabinet 10 is the arc extinguishing cabinet 10 according to any one of the embodiments.
Optionally, referring to fig. 3, the total incoming line cabinet 20 includes: a second vacuum circuit breaker 21, a second current transformer 22, a second live display 23, a first lightning arrester 25 and a first zero sequence current transformer 24; wherein,
One end of the second vacuum circuit breaker 21 is connected to the bus bar 40, and the other end is connected to the second current transformer 22;
One end of the second live display 23 is connected with one end of the second current transformer 22 far away from the second vacuum circuit breaker 21, and the other end is grounded;
one end of the first lightning arrester 25 is connected with one end of the second current transformer 22 far away from the second vacuum circuit breaker 21, and the other end is grounded;
One end of the first zero sequence current transformer 24 is connected with one end of the second current transformer 22 far away from the second vacuum circuit breaker 21, and the other end is connected with a second input end of the low current grounding line selection device 14 of the arc suppression cabinet 10.
The second vacuum circuit breaker 21 may be a 12kV vacuum circuit breaker handcart 1250A31.5kA/4S spring mechanism;
The second current transformer 22 may be of the type LZZBJ9-10 600/50.2S/0.5/10P2030/30/30VA.
The second live display 23 may be of the type DXN-12Q.
The first lightning arrester 25 may be of a type of 5WZ-12/45kV.
The first zero sequence current transformer 24 may be LXK-phi 120 100/5 10p5 2.5va.
The first zero-sequence current transformer 24 is configured to collect zero-sequence current of the total incoming line cabinet 20, so that the arc suppression cabinet 10 can sample the zero-sequence current of the total incoming line cabinet 20 through the first zero-sequence current transformer 24.
Optionally, referring to fig. 4, the feeder cabinet 30 includes: a third vacuum circuit breaker 31, a third current transformer 32, a third live display 33, a grounding switch 36, a second lightning arrester 35 and a second zero sequence current transformer 34; wherein,
One end of the third vacuum circuit breaker 31 is connected to the bus bar 40, and the other end is connected to the third current transformer 32;
One end of the third live display 33 is connected with one end of the third current transformer 32 far away from the third vacuum circuit breaker 31, and the other end is grounded;
one end of the second lightning arrester 35 is connected with one end of the third current transformer 32 far away from the third vacuum circuit breaker 31, and the other end is grounded;
one end of the second zero sequence current transformer 34 is connected with one end of the third current transformer 32 far away from the third vacuum circuit breaker 31.
The third vacuum breaker 31 may be a 12kV vacuum breaker cart 630A25kA/4S spring mechanism;
the third current transformer 32 may be of the type LZZBJ9-10 400/50.2S/0.5/10P2030/30/30VA.
The third live display 33 may be DXN-12T in model number.
The grounding switch 36 may be of the type JN15-12/25kA.
The second arrester 35 may be 5WZ-12/45kV in type.
The second zero sequence current transformer 34 may be LXK-phi 120 100/5 10p5 2.5va.
In the low-current grounding system, as shown in fig. 1, the arc suppression cabinet 10 includes: the switching device 13 and the low-current grounding line selection device 14; wherein,
The first input end of the low-current grounding line selection device 14 is connected with the sampling output end of the switching device 13, the second input end of the low-current grounding line selection device 14 is connected with the main incoming line cabinet 20, and the first output end of the low-current grounding line selection device 14 is connected with the switching input end of the switching device 13;
The first voltage transformer of the switching device 13 is used for collecting three-phase voltages of the bus 40;
The low-current grounding line selection device 14 is configured to perform insulation monitoring sampling on the three-phase voltage collected by the first voltage transformer set through the first input end, and sample the zero-sequence current of the total incoming line cabinet 20 through the second input end; and the switching device 13 is used for determining a fault phase and a fault type according to the voltage exceeding the first preset value and/or the zero sequence current exceeding the second preset value when any one phase voltage in the three-phase voltages exceeds the first preset value and/or the zero sequence current exceeds the second preset value, and controlling the switching device 13 to switch the resistive load on a branch corresponding to the fault.
In this embodiment, the arc suppression cabinet 10 has a switching device 13 and a low-current grounding line selection device 14, where the low-current grounding line selection device 14 is configured to perform insulation monitoring sampling on the three-phase voltages collected by the first voltage transformer group through the first input end, and sample the zero-sequence current of the total line incoming cabinet 20 through the second input end; and the switching device 13 is used for determining a fault phase and a fault type according to the voltage exceeding a first preset value and/or the zero sequence current exceeding a second preset value when any one phase voltage in the three-phase voltages exceeds the first preset value and/or the zero sequence current exceeding the second preset value, and controlling the switching device 13 to switch the resistive load on a branch corresponding to the fault so as to switch the resistive load on the branch corresponding to the fault when the single-phase grounding fault occurs, so that the grounding current becomes resistive-capacitive grounding current, thereby inhibiting the amplitude of the overvoltage of the power grid, realizing the purposes of inhibiting the arc discharge generated at the single-phase grounding fault point and ensuring the safe and stable operation of the power system.
On the basis of the above-described embodiments, in one embodiment of the present application, still referring to fig. 1, the arc suppression cabinet 10 further includes: a first vacuum circuit breaker 11, a first current transformer group 12 and a feeder microcomputer protection device 15; wherein,
The first vacuum circuit breaker 11 and the first current transformer group 12 are connected in series to one side of the switching device 13 facing the bus 40;
A first sampling end of the feeder microcomputer protection device 15 is connected with the first current transformer group 12, a second sampling end of the feeder microcomputer protection device 15 is connected with a first voltage transformer of the switching device 13, and a control output end of the feeder microcomputer protection device 15 is connected with the first vacuum circuit breaker 11;
The feeder microcomputer protection device 15 is configured to sample the three-phase current collected by the first current transformer set 12 through the first sampling end, sample the three-phase voltage collected by the first voltage transformer through the second sampling end, and determine whether an interphase short-circuit fault occurs according to the three-phase current collected by the first current transformer set 12 and the three-phase voltage collected by the first voltage transformer, and control the first vacuum circuit breaker 11 to trip when the interphase short-circuit fault occurs.
Wherein, optionally, the model of the low-current grounding line selection device 14 can be HD-NSL200; the first vacuum breaker 11 may be a 12kV vacuum breaker cart 1250A 31.5Ka/4S spring mechanism; the first current transformer group 12 comprises three current transformers for measuring three-phase currents, and the current transformers can be of the type LZZBJ9-10 400/5P 20 30VA.
In this embodiment, the feeder microcomputer protection device 15 is matched with the first vacuum circuit breaker 11 and the first current transformer group 12 to monitor whether the equipment in the arc suppression cabinet 10 has interphase equal short-circuit faults, and operates on the first vacuum circuit breaker 11 to trip when the faults occur.
Alternatively, the feeder microcomputer protection device 15 may be of the CSC281 type.
Optionally, the low-current grounding line selection device 14 is configured to control the switching device 13 to switch the resistive load to the branch corresponding to the fault, and specifically is configured to send a closing instruction to the switching device 13, so that the switching device 13 switches the resistive load to the branch corresponding to the fault;
The low-current grounding line selection device 14 is further configured to send an opening instruction to the switching device 13 when the branch fault corresponding to the fault is eliminated, so that the switching device 13 stops switching the resistive load.
The closing command and the opening command may be a high level command or a low level command, respectively, or may be PWM wave commands having different duty ratios, or the like. The present application is not limited thereto, and is specifically applicable as the case may be.
Optionally, referring to fig. 2, the switching device 13 includes: a first charged display 131, a switching unit, a voltage transformer group 137, an overvoltage protector 136, a primary detuner 138, and a fuse 135; wherein,
One end of the first charge display 131 is connected with one end of the first current transformer group 12 far away from the vacuum circuit breaker, and the other end is grounded;
one end of the switching unit is connected with one end of the first current transformer group 12 far away from the vacuum circuit breaker, and the other end of the switching unit is grounded; the switching unit comprises three switching branches, and each switching branch is composed of a single-phase alternating-current vacuum contactor 132, a phase current transformer 133 and a resistor 134 which are sequentially connected in series;
One end of the fuse 135 is connected with one end of the first current transformer group 12 far away from the vacuum circuit breaker, and the other end is connected with the voltage transformer group 137; the voltage transformer group 137 is connected with the primary harmonic eliminator 138 far away from the fuse 135; one end of the primary harmonic eliminator 138, which is far from the voltage transformer group 137, is grounded;
One end of the overvoltage protector 136 is connected with one end of the first current transformer group 12 far away from the vacuum circuit breaker, and the other end is grounded;
the single-phase ac vacuum contactor 132 is closed when receiving the closing instruction of the low-current grounding line selection device 14, so as to put a capacitive load on the switching branch where the single-phase ac vacuum contactor is located, and is opened when receiving the opening instruction of the low-current grounding line selection device 14.
Wherein, optionally, the model of the first charged display 131 may be DXN-12Q;
The voltage transformer group 137 comprises three voltage transformers for respectively detecting three-phase voltages, and the types of the voltage transformers can be JDZ10-10A 10/. V3/0.1/3 kV;
the model of the overvoltage protector 136 can be TBP-12.7/35kV;
The primary detuner 138 may be of the type LXQ-10 (strongly insulated);
the resistor 134 may be 10kV/100 Ω (stainless steel);
The type of the fuse 135 may be a high voltage fuse 135XNP a-12/0.5A.
In summary, the embodiment of the application provides an arc suppression cabinet and a low-current grounding system, wherein the arc suppression cabinet is provided with a switching device and a low-current grounding line selection device, and the low-current grounding line selection device is used for conducting insulation monitoring sampling on three-phase voltages collected by the first voltage transformer group through the first input end and sampling zero-sequence current of the total line distribution cabinet through the second input end; and the switching device is used for determining fault phases and fault types according to the voltage exceeding a first preset value and/or the zero sequence current exceeding a second preset value when any one phase voltage in the three-phase voltages exceeds the first preset value and/or the zero sequence current exceeding the second preset value, and controlling the switching device to switch the resistive load on the branch corresponding to the fault, so that when a single-phase grounding fault occurs, the resistive load is switched on the branch corresponding to the fault, and the grounding current becomes resistive-capacitive grounding current, thereby inhibiting the amplitude of the overvoltage of the power grid, realizing the purposes of inhibiting arc discharge at the single-phase grounding fault point and ensuring the safe and stable operation of the power system.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. The arc extinguishing cabinet is characterized by being applied to a low-current grounding system, wherein the low-current grounding system comprises a total wire inlet cabinet and a plurality of wire inlet cabinets, wherein the total wire inlet cabinets and the plurality of wire inlet cabinets are connected in parallel with a bus; the arc suppression cabinet includes: the switching device, the low-current grounding line selection device, the first vacuum circuit breaker, the first current transformer group and the feeder microcomputer protection device; wherein,
The first input end of the low-current grounding line selection device is connected with the sampling output end of the switching device, the second input end of the low-current grounding line selection device is connected with the total incoming line cabinet, and the first output end of the low-current grounding line selection device is connected with the switching input end of the switching device;
the first vacuum circuit breaker and the first current transformer group are connected in series to one side of the switching device, which faces the bus;
The first sampling end of the feeder microcomputer protection device is connected with the first current transformer group, the second sampling end of the feeder microcomputer protection device is connected with the first voltage transformer of the switching device, and the control output end of the feeder microcomputer protection device is connected with the first vacuum circuit breaker;
The first voltage transformer of the switching device is used for collecting three-phase voltages of the bus;
The low-current grounding line selection device is used for conducting insulation monitoring sampling on the three-phase voltage collected by the first voltage transformer group through the first input end and sampling the zero-sequence current of the total incoming line cabinet through the second input end; when any one phase voltage in the three-phase voltages exceeds a first preset value and/or the zero sequence current exceeds a second preset value, determining a fault phase and a fault type according to the voltage exceeding the first preset value and/or the zero sequence current exceeding the second preset value, and controlling the switching device to switch the resistive load on a branch corresponding to the fault;
the feeder microcomputer protection device is used for sampling three-phase current collected by the first current transformer group through the first sampling end, sampling three-phase voltage collected by the first voltage transformer through the second sampling end, determining whether interphase short-circuit faults occur according to the three-phase current collected by the first current transformer group and the three-phase voltage collected by the first voltage transformer, and controlling the first vacuum circuit breaker to trip when the interphase short-circuit faults occur.
2. The arc suppression cabinet according to claim 1, wherein the low-current grounding line selection device controls the switching device to switch the resistive load for the branch corresponding to the fault, and is specifically configured to send a closing instruction to the switching device, so that the switching device switches the resistive load for the branch corresponding to the fault;
the low-current grounding line selection device is also used for sending a disconnection instruction to the switching device when the branch fault corresponding to the fault is eliminated, so that the switching device stops switching the resistive load.
3. The arc suppression cabinet according to claim 2, wherein the switching device comprises: the device comprises a first charged display, a switching unit, a voltage transformer group, an overvoltage protector, a primary harmonic eliminator and a fuse; wherein,
One end of the first charge display is connected with one end of the first current transformer group, which is far away from the vacuum circuit breaker, and the other end of the first charge display is grounded;
One end of the switching unit is connected with one end of the first current transformer group, which is far away from the vacuum circuit breaker, and the other end of the switching unit is grounded; the switching unit comprises three switching branches, and each switching branch is composed of a single-phase alternating-current vacuum contactor, a phase current transformer and a resistor which are sequentially connected in series;
one end of the fuse is connected with one end, far away from the vacuum circuit breaker, of the first current transformer group, and the other end of the fuse is connected with the voltage transformer group; the voltage transformer group is far away from the fuse and is connected with the primary harmonic eliminator; one end of the primary harmonic eliminator, which is far away from the voltage transformer group, is grounded;
One end of the overvoltage protector is connected with one end of the first current transformer group, which is far away from the vacuum circuit breaker, and the other end of the overvoltage protector is grounded;
The single-phase alternating current vacuum contactor is closed when receiving a closing instruction of the low-current grounding line selection device, so that capacitive load is input to a switching branch where the single-phase alternating current vacuum contactor is located, and the single-phase alternating current vacuum contactor is disconnected when receiving a disconnection instruction of the low-current grounding line selection device.
4. A low current grounding system, comprising: a bus, a main incoming line cabinet connected with the bus in parallel an arc extinguishing cabinet and a plurality of feeder cabinets;
the arc extinguishing cabinet is the arc extinguishing cabinet of any one of claims 1-3.
5. The low current grounding system of claim 4, wherein said total incoming line cabinet comprises: the second vacuum circuit breaker, the second current transformer, the second live display, the first lightning arrester and the first zero sequence current transformer; wherein,
One end of the second vacuum circuit breaker is connected with the bus, and the other end of the second vacuum circuit breaker is connected with the second current transformer;
One end of the second electrified display is connected with one end of the second current transformer far away from the second vacuum circuit breaker, and the other end of the second electrified display is grounded;
one end of the first lightning arrester is connected with one end of the second current transformer far away from the second vacuum circuit breaker, and the other end of the first lightning arrester is grounded;
One end of the first zero sequence current transformer is connected with one end, far away from the second vacuum circuit breaker, of the second current transformer, and the other end of the first zero sequence current transformer is connected with a second input end of the low-current grounding line selection device of the arc suppression cabinet.
6. The low current grounding system of claim 4, wherein said feeder cabinet comprises: the third vacuum circuit breaker, the third current transformer, the third live display, the grounding switch, the second lightning arrester and the second zero sequence current transformer; wherein,
One end of the third vacuum circuit breaker is connected with the bus, and the other end of the third vacuum circuit breaker is connected with the third current transformer;
one end of the third electrified display is connected with one end of the third current transformer far away from the third vacuum circuit breaker, and the other end of the third electrified display is grounded;
One end of the second lightning arrester is connected with one end of the third current transformer far away from the third vacuum circuit breaker, and the other end of the second lightning arrester is grounded;
one end of the second zero sequence current transformer is connected with one end of the third current transformer far away from the third vacuum circuit breaker.
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