CN112542822B - 35KV electric-collecting ring main unit protection system and method for wind farm - Google Patents
35KV electric-collecting ring main unit protection system and method for wind farm Download PDFInfo
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- CN112542822B CN112542822B CN202011495043.3A CN202011495043A CN112542822B CN 112542822 B CN112542822 B CN 112542822B CN 202011495043 A CN202011495043 A CN 202011495043A CN 112542822 B CN112542822 B CN 112542822B
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- 238000005259 measurement Methods 0.000 claims abstract description 67
- 238000012806 monitoring device Methods 0.000 claims abstract description 33
- 238000012544 monitoring process Methods 0.000 claims abstract description 10
- 230000035945 sensitivity Effects 0.000 claims abstract description 10
- 238000004891 communication Methods 0.000 claims abstract description 9
- 230000011664 signaling Effects 0.000 claims abstract description 8
- 230000005284 excitation Effects 0.000 claims description 4
- 238000012790 confirmation Methods 0.000 claims description 3
- 238000004146 energy storage Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims 6
- 238000007906 compression Methods 0.000 claims 1
- 238000007689 inspection Methods 0.000 claims 1
- 230000009471 action Effects 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
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- 238000005859 coupling reaction Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006855 networking Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
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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
- H02H7/22—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 for distribution gear, e.g. bus-bar systems; for switching devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/006—Calibration or setting of parameters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
- H02J13/0004—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers involved in a protection system
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/14—Protecting elements, switches, relays or circuit breakers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention provides a protection system and a protection method for a 35KV electric-collecting wire ring main unit of a wind power plant, wherein a line remote monitoring device is in communication connection with a monitoring server, so that remote signaling, remote measuring and remote control functions of the ring main unit are realized; the two sets of line protection measurement and control devices are connected with the ring main unit in a parallel connection mode, and are configured to be used in a main-standby mode; installing a line protection measurement and control device on a grid plate in the ring main unit, wherein a power supply of the line protection measurement and control device is connected to a power supply of the ring main unit; the voltage and current loops of the line protection measurement and control device are switched on the inner end row of the ring main unit, and correspondingly integrated into the ring main unit voltage loop and the series-connected ring main unit current loop. The system improves the reliability of the operation of the protection device and properly improves the sensitivity of the direction protection. The possibility of misoperation of the protection device is reduced. And the linkage of the frequency converter and the ring main unit switch is realized, and when the grid-connected switch fails to operate, the frequency converter is linked with the ring main unit switch.
Description
Technical Field
The invention relates to the technical field of ring main units, in particular to a 35KV electric-collecting wire ring main unit protection system and method for a wind power plant.
Background
In the current wind power plant wire collection ring main unit, the minimum setting value of the time limit overcurrent protection is generally lower, for example, 0.5A, so that the protection sensitivity is poor, the protection is not blocked by PT wire breakage, the protection is not blocked in the time limit overcurrent direction when PT wire breakage occurs, and the current collection circuit is easy to trip by mistake.
Moreover, the on-site remote signaling, remote sensing and remote control functions of the ring main unit cannot be realized, a user cannot know the running state of the on-site ring main unit in time, and cannot control and monitor the on-site ring main unit effectively, so that the system cannot run stably, cannot be found out in time when faults occur, cannot monitor timely, and influences the stable running of the wind power plant electric wire collection ring main unit.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention ensures the safe and economic operation of the wind turbine generator, and can rapidly and reliably act when the power transmission and distribution system fails, thereby achieving the purposes of effectively cutting off the failure and avoiding the expansion of the failure.
The method specifically comprises the following steps: two sets of line protection measurement and control devices and a line remote monitoring device;
the line remote monitoring device is in communication connection with the monitoring server to realize remote signaling, remote measuring and remote control functions of the ring main unit;
the two sets of line protection measurement and control devices are connected with the ring main unit in a parallel connection mode, and are configured to be used in a main-standby mode;
installing a line protection measurement and control device on a grid plate in the ring main unit, wherein a power supply of the line protection measurement and control device is connected to a power supply of the ring main unit; the voltage and current loops of the line protection measurement and control device are switched on the inner end row of the ring main unit, and correspondingly integrated into the ring main unit voltage loop and the series-connected ring main unit current loop.
It should be further noted that the line protection measurement and control device is configured with a UPS power source, and the UPS power source supplies power to the line protection measurement and control device;
the line protection measurement and control device is arranged in the fan tower barrel.
It should be further noted that 11 3MW fans are configured on the current collecting line of the system;
short-circuit current is 645A when the low-voltage side of the box is short-circuited in the maximum operation mode;
the low-voltage side two-phase short-circuit current of the box is 549A in the minimum operation mode;
the rated current of the 3MW generator is 54.4A;
each generator can provide about 65.3A of rated current which is 1.2 times at maximum when in fault;
when one fan box fails at the low-voltage side, the maximum current provided by other fans is 653A, thereby meeting the requirement of three-phase short-circuit current;
the line protection measurement and control device is provided with quick break and time limit overcurrent and grounding protection, the primary fixed value of the quick break is 381A, and the sensitivity of the low-voltage side fault is 549/381=1.44.
It should be further noted that the line remote monitoring device is configured with three sections of time-limiting overcurrent protection, each section has an independent current fixed value, time fixed value and control word;
each section is respectively configured whether to be subjected to double-pressure locking and whether to be subjected to direction locking, and is executed according to the configuration state.
The circuit remote monitoring device is used for carrying out timing overcurrent protection based on any section, the protection fixed value is set according to 1.5 times of the no-load current of the circuit, the time is set to be 0.5S, and the transformer air-drop excitation surge current is avoided.
It should be further noted that the method further includes: a protection fixed value configuration module;
the protection fixed value configuration module is used for configuring current quick-break state data, time limit quick-break state data, overcurrent protection state data, reclosing state data, low-frequency load shedding state data, low-voltage load shedding state data, zero-sequence overcurrent I section state data, zero-sequence overcurrent II section state data, CT wire break alarm state data, PT wire break alarm state data and overload alarm state data.
The protection fixed value configuration module is further used for configuring IP subnet address data, mask address data, communication password data, protection sampling uploading period state data, telemetry confirmation time state data, spring energy storage time state data, CT rated primary value state data, CT rated secondary value state data, zero sequence CT rated primary state data, zero sequence CT rated secondary state data, bus PT rated primary value state data, bus PT rated secondary value state data, line PT rated primary value state data and line PT rated secondary value.
The circuit protection measurement and control device and the circuit remote monitoring device are respectively configured to the centralized control room for the operators to patrol; and the monitoring display screen displays the on-site switch states, current and voltage values and device wave recording, and the system also provides an operation interface for adding, deleting and checking the data information.
The invention also provides a method for executing the configuration of the 35KV electric collecting wire ring main unit protection system of the wind farm, which comprises the following steps:
two sets of line protection measurement and control devices are arranged on a grid plate in the ring main unit;
the power supply of the line protection measurement and control device is connected to the power supply of the ring main unit;
the voltage and current loops of the line protection measurement and control device are switched on the inner end row of the ring main unit and correspondingly integrated into the ring main unit voltage loop and the ring main unit current loop;
configuring a line remote monitoring device into the ring main unit;
the remote measuring, remote signaling and remote control functions are realized by using the line remote monitoring device,
checking the connection relation between the circuit after the circuit protection measurement and control device and the circuit remote monitoring device are installed and other equipment with a drawing, recording the configuration process, and preventing PT secondary short circuit and CT secondary open circuit;
configuring protection fixed values of a line protection measurement and control device and a line remote monitoring device;
performing protection check and secondary loop check on the line protection measurement and control device and the line remote monitoring device;
and the on-load direction measurement work is carried out on the line protection measurement and control device and the line remote monitoring device, so that protection misoperation caused by CT direction wiring errors is avoided.
From the above technical scheme, the invention has the following advantages:
the 35KV electric-collecting ring main unit protection system for the wind farm improves the reliability of the action of the protection device, and properly improves the sensitivity of direction protection. The possibility of misoperation of the protection device is reduced.
The 35KV electric-collecting ring main unit protection system for the wind farm improves the reliability, the quick action and the sensitivity of protection. And the linkage of the frequency converter and the ring main unit switch is realized, and when the grid-connected switch fails to operate, the frequency converter is linked with the ring main unit switch.
The 35KV electric-collecting ring main unit protection system of the wind power plant provided by the invention can realize real-time monitoring of the operation condition of the ring main unit switch by real-time monitoring signal networking, and centralized control personnel can monitor the operation condition of ring main unit protection in real time.
The ring main unit direct current control system is modified, so that impact current acts through the line protection measurement and control device, the burning out of insurance is avoided, the warning loop is additionally arranged to serve as an indication protection system of the protection switch, the fault type is quickly searched and determined through the display screen history record, the fault is timely processed, the fault processing time is shortened, and the shutdown electric quantity loss and economic loss caused by the non-stop fault are avoided.
Drawings
In order to more clearly illustrate the technical solutions of the present invention, the drawings that are needed in the description will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a 35KV electric collecting ring main unit protection system of a wind farm.
Detailed Description
The following description of the embodiments of the present invention 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 invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Those of ordinary skill in the art will appreciate that the elements and algorithm steps described in connection with the embodiments disclosed herein may be embodied in electronic hardware, in computer software, or in a combination of the two, and that the elements and steps of the examples have been generally described in terms of function in the foregoing description to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The block diagrams depicted in the figures are merely functional entities and do not necessarily correspond to physically separate entities. That is, the functional entities may be implemented in software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor devices and/or microcontroller devices.
The invention provides a 35KV electric collecting wire ring main unit protection system of a wind farm, which comprises the following components: two sets of line protection measurement and control devices 1 and line remote monitoring devices 2;
the line remote monitoring device 2 is in communication connection with a monitoring server, so that remote signaling, remote measuring and remote control functions of the ring main unit are realized;
the two sets of line protection measurement and control devices 1 are connected with the ring main unit in a parallel connection mode, and are configured to be used in a main-standby mode;
the line protection measurement and control device 1 is arranged on a grid plate in the ring main unit, and a power supply of the line protection measurement and control device 1 is connected to the power supply of the ring main unit; the voltage and current loops of the line protection measurement and control device are switched on the inner end row of the ring main unit, and correspondingly integrated into the ring main unit voltage loop and the series-connected ring main unit current loop.
The 35KV electric-collecting ring main unit protection system of the wind farm can be realized in other modes. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. In addition, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices, or elements, or may be an electrical, mechanical, or other form of connection.
The 35KV hub ring main unit protection system for a wind farm according to the present invention provides many specific details to give a thorough understanding of embodiments of the present invention. One skilled in the relevant art will recognize, however, that the invention may be practiced without one or more of the specific details, or with other methods, components, devices, steps, etc. In other instances, well-known methods, devices, implementations, or operations are not shown or described in detail to avoid obscuring aspects of the invention.
Further, the line protection measurement and control device is provided with a UPS power supply, and the UPS power supply supplies power to the line protection measurement and control device; the line protection measurement and control device is arranged in the fan tower barrel.
The ring main unit can be REF615 type protection device produced by ABB, and is provided with current quick break, time-limited overcurrent and grounding protection. The power supply of the ring main unit is provided by two 12V storage batteries in series connection and is arranged in the fan tower. If the device is used in coast, the device has salt spray corrosion resistance, and the contact resistance of the output joint and the reliability of protection and secondary circuit are good.
As an embodiment provided by the invention, 11 3MW fans are configured on a current collecting line of the system; short-circuit current is 645A when the low-voltage side of the box is short-circuited in the maximum operation mode; the low-voltage side two-phase short-circuit current of the box is 549A in the minimum operation mode; the rated current of the 3MW generator is 54.4A; each generator can provide about 65.3A of rated current which is 1.2 times at maximum when in fault; when one fan box fails at the low-voltage side, the maximum current provided by other fans is 653A, thereby meeting the requirement of three-phase short-circuit current; the line protection measurement and control device is provided with quick break and time limit overcurrent and grounding protection, the primary fixed value of the quick break is 381A, and the sensitivity of the low-voltage side fault is 549/381=1.44.
The line protection measurement and control device ensures safe and economic operation of the wind turbine generator, and can act rapidly and reliably when the power transmission and distribution system has element faults, thereby achieving the purposes of effectively removing the faults and avoiding the expansion of the faults.
The invention ensures the safe and economic operation of the wind turbine generator, and the line protection measurement and control device can act rapidly and reliably when the system fails, thereby achieving the purposes of effectively cutting off the failure and avoiding the expansion of the failure.
In the invention, a line remote monitoring device is configured with three sections of time-limiting overcurrent protection, and each section has an independent current fixed value, an independent time fixed value and a control word; each section is respectively configured whether to be subjected to double-pressure locking and whether to be subjected to direction locking, and is executed according to the configuration state. The line remote monitoring device performs timing overcurrent protection based on any section, the protection fixed value is set according to 1.5 times of line no-load current, the time is set to be 0.5S, and the transformer air-drop excitation surge current is avoided.
That is, the system sets three-section time-limiting overcurrent protection, and each section has independent current fixed value, time fixed value and control word. Each segment can independently select whether to be subjected to voltage-back locking (low voltage and negative sequence voltage) or direction locking.
Any period of time is limited, overcurrent protection is put into operation through voltage or through directional locking, PT wire breakage self-checking is put into operation, and bus PT wire breakage is automatically withdrawn.
The system protection fixed value is set according to 1.5 times of the line no-load current (actually measured no-load current), and the time is set to 0.5S (avoiding the transformer air-drop excitation surge current). When faults occur on the current collecting line, the line protection measurement and control device is used for protecting the switch of the ring main unit.
When the low-voltage side of the transformer fails, the sensitivity of overcurrent protection is reduced when the fan generates power at full load. Before the direction protection operation, the on-load direction measurement work is needed, so that protection misoperation caused by CT direction wiring errors is avoided.
The line protection measurement and control device can adopt a PCS-9671D differential protection device produced by Nanzhong. The device has the differential protection of the transformer, the overcurrent protection of the medium-voltage side and the low-voltage side, and has the inrush current locking function of the transformer.
The increased capacity UPS has the functions of fault warning and power-off delay shutdown, and is used as a working power supply of a line protection measurement and control device. The primary operating loop power is provided by the UPS.
The high-voltage side current of the transformer is taken from the original CT of the existing ring main unit switch, and the 690V current of the low-voltage side is taken from the original CT of the grid-connected circuit breaker outlet; a group of CT is added on the side of the transformer 400V and is led to the ring main unit through a plurality of flexible cables respectively.
Before protection operation, the on-load direction measurement work is needed, so that protection misoperation caused by CT direction wiring errors is avoided.
The 35KV electric-collecting ring main unit protection system for the wind farm improves the reliability of the action of a protection device and properly improves the sensitivity of direction protection. The possibility of misoperation of the protection device is reduced.
The reliability, the quick action and the sensitivity of the protection are improved. And the linkage of the frequency converter and the ring main unit switch is realized, and when the grid-connected switch fails to operate, the frequency converter is linked with the ring main unit switch.
As an embodiment provided by the present invention, the system further includes: a protection fixed value configuration module;
the protection fixed value configuration module is used for configuring current quick-break state data, time limit quick-break state data, overcurrent protection state data, reclosing state data, low-frequency load shedding state data, low-voltage load shedding state data, zero-sequence overcurrent I section state data, zero-sequence overcurrent II section state data, CT wire break alarm state data, PT wire break alarm state data and overload alarm state data.
The method comprises the following steps:
the protection fixed value configuration module is also used for configuring IP subnet address data, mask address data, communication password data, protection sampling uploading period state data, telemetry confirmation time state data, spring energy storage time state data, CT rated primary value state data, CT rated secondary value state data, zero sequence CT rated primary state data, zero sequence CT rated secondary state data, bus PT rated primary value state data, bus PT rated secondary value state data, line PT rated primary value state data and line PT rated secondary value.
The method comprises the following steps:
the invention performs real-time monitoring signal networking to realize real-time monitoring of the running condition of the switch of the ring main unit, and centralized control personnel can monitor the protection running condition of the ring main unit in real time.
The ring main unit direct current control system is modified, so that impact current acts through the line protection measurement and control device, the burning out of insurance is avoided, the warning loop is additionally arranged to serve as an indication protection system of the protection switch, the fault type is quickly searched and determined through the display screen history record, the fault is timely processed, the fault processing time is shortened, and the shutdown electric quantity loss and economic loss caused by the non-stop fault are avoided.
Based on the system, the invention also provides a method for executing the configuration of the 35KV electric collecting ring main unit protection system of the wind power plant, which comprises the following steps:
two sets of line protection measurement and control devices are arranged on a grid plate in the ring main unit;
the power supply of the line protection measurement and control device is connected to the power supply of the ring main unit;
the voltage and current loops of the line protection measurement and control device are switched on the inner end row of the ring main unit and correspondingly integrated into the ring main unit voltage loop and the ring main unit current loop;
configuring a line remote monitoring device into the ring main unit;
the remote measuring, remote signaling and remote control functions are realized by using the line remote monitoring device,
checking the connection relation between the circuit after the circuit protection measurement and control device and the circuit remote monitoring device are installed and other equipment with a drawing, recording the configuration process, and preventing PT secondary short circuit and CT secondary open circuit;
configuring protection fixed values of a line protection measurement and control device and a line remote monitoring device;
performing protection check and secondary loop check on the line protection measurement and control device and the line remote monitoring device;
and the on-load direction measurement work is carried out on the line protection measurement and control device and the line remote monitoring device, so that protection misoperation caused by CT direction wiring errors is avoided.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. 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 invention. Thus, the present invention 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 (7)
1. The utility model provides a 35KV collection electric wire looped netowrk cabinet protection system of wind-powered electricity generation field, its characterized in that includes: two sets of line protection measurement and control devices and a line remote monitoring device;
the line remote monitoring device is in communication connection with the monitoring server to realize remote signaling, remote measuring and remote control functions of the ring main unit;
installing a line protection measurement and control device on a grid plate in the ring main unit, wherein a power supply of the line protection measurement and control device is connected to a power supply of the ring main unit; the voltage and current loops of the line protection measurement and control device are switched on the inner end row of the ring main unit and correspondingly integrated into the ring main unit voltage loop and the ring main unit current loop;
11 3MW fans are arranged on a current collecting circuit of the system;
short-circuit current is 645A when the low-voltage side of the box is short-circuited in the maximum operation mode;
the low-voltage side two-phase short-circuit current of the box is 549A under the minimum operation mode;
the rated current of the 3MW generator is 54.4A;
each generator can provide rated current 65.3A which is 1.2 times at maximum when in fault;
when one fan box fails at the low-voltage side, the maximum current provided by other fans is 653A, thereby meeting the requirement of three-phase short-circuit current;
the line protection measurement and control device is provided with quick break and time limit overcurrent and grounding protection, wherein the primary fixed value of the quick break is 381A, and the sensitivity of the line protection measurement and control device is 549/381=1.44 when the low-voltage side fails;
the line remote monitoring device is configured with three sections of time-limiting overcurrent protection, wherein each section has an independent current fixed value, an independent time fixed value and a control word;
each section is respectively configured whether to be subjected to re-compression locking and whether to be subjected to direction locking, and is executed according to the configuration state;
the line remote monitoring device performs timing overcurrent protection based on any section, the protection fixed value is set according to 1.5 times of line no-load current, the time is set to be 0.5S, and the transformer air-drop excitation surge current is avoided.
2. The 35KV electricity collection line ring main unit protection system of the wind farm according to claim 1, wherein,
the two sets of line protection measurement and control devices are connected with the ring main unit in a parallel mode, and are configured to be used in a main-standby mode.
3. The 35KV electricity collection line ring main unit protection system of the wind farm according to claim 1, wherein,
the line protection measurement and control device is provided with a UPS power supply, and the UPS power supply supplies power to the line protection measurement and control device;
the line protection measurement and control device is arranged in the fan tower barrel.
4. The 35KV electricity collection line ring main unit protection system of the wind farm according to claim 1, wherein,
further comprises: a protection fixed value configuration module;
the protection fixed value configuration module is used for configuring current quick-break state data, time limit quick-break state data, overcurrent protection state data, reclosing state data, low-frequency load shedding state data, low-voltage load shedding state data, zero-sequence overcurrent I section state data, zero-sequence overcurrent II section state data, CT wire break alarm state data, PT wire break alarm state data and overload alarm state data.
5. The 35KV electricity collection line ring main unit protection system of the wind farm according to claim 4, wherein,
the protection fixed value configuration module is also used for configuring IP subnet address data, mask address data, communication password data, protection sampling uploading period state data, telemetry confirmation time state data, spring energy storage time state data, CT rated primary value state data, CT rated secondary value state data, zero sequence CT rated primary state data, zero sequence CT rated secondary state data, bus PT rated primary value state data, bus PT rated secondary value state data, line PT rated primary value state data and line PT rated secondary value.
6. The 35KV electricity collection line ring main unit protection system of the wind farm according to claim 4, wherein,
the line protection measurement and control device and the line remote monitoring device are respectively configured to the centralized control room for the inspection of operators; and the monitoring display screen displays the on-site switch states, current and voltage values and device wave recording, and the system also provides an operation interface for adding, deleting and checking the data information.
7. A method for configuring and executing a 35KV electric-collecting ring main unit protection system of a wind power plant, which is characterized in that the method adopts the 35KV electric-collecting ring main unit protection system of the wind power plant according to any one of claims 1 to 6;
the method comprises the following steps:
two sets of line protection measurement and control devices are arranged on a grid plate in the ring main unit;
the power supply of the line protection measurement and control device is connected to the power supply of the ring main unit;
the voltage and current loops of the line protection measurement and control device are switched on the inner end row of the ring main unit and correspondingly integrated into the ring main unit voltage loop and the ring main unit current loop;
configuring a line remote monitoring device into the ring main unit;
the remote measuring, remote signaling and remote control functions are realized by using the line remote monitoring device,
checking the connection relation between the circuit after the circuit protection measurement and control device and the circuit remote monitoring device are installed and other equipment with a drawing, recording the configuration process, and preventing PT secondary short circuit and CT secondary open circuit;
configuring protection fixed values of a line protection measurement and control device and a line remote monitoring device;
performing protection check and secondary loop check on the line protection measurement and control device and the line remote monitoring device;
and the on-load direction measurement work is carried out on the line protection measurement and control device and the line remote monitoring device, so that protection misoperation caused by CT direction wiring errors is avoided.
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| CN201266832Y (en) * | 2008-08-14 | 2009-07-01 | 浙江省星炬电力电子有限公司 | Protection observe and control device for high-voltage motor |
| CN201383712Y (en) * | 2009-04-24 | 2010-01-13 | 安徽中兴继远信息技术有限公司 | Ring-network cabinet monitor terminal |
| CN108923530A (en) * | 2018-05-23 | 2018-11-30 | 国网上海市电力公司 | A kind of double set redundancy switching methods of transformer station measurement and control device |
| CN111900696B (en) * | 2020-07-15 | 2022-08-23 | 中国人民解放军海军工程大学 | Shore power relay protection system and method for AC-DC coexistence power supply |
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| Title |
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| 10kV配网线路开关配置和配网线路保护定值设定原则;黄志文;《现代物业(上旬刊)》;20141205(第12期);全文 * |
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