CN113097980B - 10kV major power protection project protection and automatic device configuration system and method - Google Patents
10kV major power protection project protection and automatic device configuration system and method Download PDFInfo
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- CN113097980B CN113097980B CN202110425728.9A CN202110425728A CN113097980B CN 113097980 B CN113097980 B CN 113097980B CN 202110425728 A CN202110425728 A CN 202110425728A CN 113097980 B CN113097980 B CN 113097980B
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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
- 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
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
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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
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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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
- Y04S20/20—End-user application control systems
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Abstract
The disclosure provides a system and a method for protection and automatic device configuration of 10kV major power protection engineering, which comprises the following steps: the 10kV system protection configuration equipment is used for protecting a 10kV main supply line breaker, a 10kV subsection and a 10kV standby supply line breaker; the main transformer protection configuration equipment is used for configuring current differential protection for main protection, configuring composite voltage locking overcurrent protection, overload protection and temperature protection for high backup protection; the 0.4kV section protection equipment is used for configuring timing time limit overcurrent protection, post-closing acceleration protection and charging protection; the total-station trans-interval interlocking device is used for controlling the switching state and avoiding two 10kV power supplies from supplying power to the same transformer, two 0.4kV power supplies from supplying power to the same load and a generator and the 0.4kV power supply from supplying power to the same load. The technical scheme disclosed by the invention has the advantages that the protection configuration is reliable, the protection configuration is perfectly matched with an automatic device, a standby power supply can be automatically switched in after the fault is removed, and the power supply to the load is not influenced.
Description
Technical Field
The disclosure belongs to the technical field of power distribution, and particularly relates to a protection and automatic device configuration system and method for 10kV major power protection engineering.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The importance of 10kV power distribution projects in the whole power system is relatively low, so that the protection and control system of domestic power distribution projects is often completed only by the design of equipment manufacturers. However, manufacturers can only stand in the product production perspective to consider the protection and control problems, and cannot consider the whole from a 10kV system to low-voltage distribution, which generally causes the problems of protection dead zones, imperfect logic of automatic devices, and the like.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a protection and automatic device configuration system for 10kV major power protection engineering, and solves the problems of low overall protection reliability and unreasonable automatic device configuration of the current domestic 10kV power distribution project.
In order to achieve the above object, one or more embodiments of the present disclosure provide the following technical solutions:
in a first aspect, a 10kV major power protection project protection and automation device configuration system is disclosed, comprising:
the 10kV system protection configuration equipment is used for protecting a 10kV main supply line breaker, a 10kV subsection and a 10kV standby supply line breaker;
the main transformer protection configuration equipment is used for main protection configuration current differential protection, high backup protection configuration composite voltage lockout overcurrent protection, overload protection and temperature protection;
the 0.4kV section protection equipment is used for configuring timing-limited overcurrent protection, accelerated protection after closing and charging protection;
the total-station trans-interval interlocking device is used for controlling the switching state and avoiding two 10kV power supplies from supplying power to the same transformer, two 0.4kV power supplies from supplying power to the same load and a generator and the 0.4kV power supply from supplying power to the same load.
According to the further technical scheme, the 10kV system protection configuration equipment comprises a protection device configured at a 10kV main supply line switch cabinet, and is configured with current quick-break protection and overcurrent protection to protect a 10kV bus;
when the fault occurs on the 10kV bus, the fault is removed, and the spare power automatic switching device installed in the 10kV sectional cabinet is locked, so that the 10kV spare power supply is prevented from switching on the 10kV bus with the fault through spare power.
According to the further technical scheme, the 10kV system protection configuration equipment further comprises a sectional protection and automatic switching device which is configured at the 10kV sectional switch cabinet, and is configured with current quick-break protection and overcurrent protection to protect a 10kV bus;
when the voltage of the 10kV bus is detected to be non-voltage and the voltage of the standby 10kV line is detected, the standby operation is carried out;
if a fault is found after the backup power supply is switched on, the section switch is quickly tripped, or the backup 10kV line runs with a 10kV bus, and when the fault occurs on the 10kV bus, the section switch is tripped.
According to the further technical scheme, the 10kV system protection configuration equipment further comprises a circuit breaker operation box which is configured at the 10kV spare power supply line switch cabinet and used for operating the circuit breaker.
Further technical scheme, main transformer protection configuration equipment includes: a main protection device and a high backup protection device;
the main protection device is used for main protection configuration current differential protection, current quick-break protection is configured as transformer main protection, and when a current quick-break protection setting value avoids short circuit at a low-voltage side, the maximum short-circuit current flowing through the protection device is lower than two-phase short-circuit current at the installation position of the protection device in a system minimum operation mode;
the high backup protection device is configured with composite voltage lockout overcurrent protection, overload protection and temperature protection.
Further technical scheme, main transformer protection configuration equipment still includes: the low backup protection device is configured with current quick-break protection, timing current-limit quick-break protection, overcurrent protection and low-voltage side single-phase grounding protection by utilizing the protection function of the 0.4kV circuit breaker.
According to the further technical scheme, the 0.4kV section protection equipment comprises a section protection and automatic switching device which is configured at a 0.4kV section switch cabinet, and is configured with timing-limited overcurrent protection, accelerated protection after switching-on and charging protection;
when a fault bus is manually or protectively switched on, the protection action is accelerated after the switch-on, and the sectional circuit breaker is tripped off, so that the condition that two sections of 0.4kV buses are simultaneously de-energized due to the tripping of another main transformer low-voltage circuit breaker is avoided.
Further technical scheme still includes 0.4kV stand-by power supply automatic switching equipment for:
when a certain set switch is tripped on site or remotely or automatically due to overcurrent action, the 0.4kV sectional spare power automatic switch is locked;
and the main protection of the transformer is simultaneously tripped or other 0.4kV I buses are in power failure, and the 0.4kV sectional spare power automatic switching is not locked when the condition of the spare power automatic switching is met.
In a second aspect, a protection and automation device configuration method for 10kV major power protection engineering is disclosed, which comprises:
protecting the 10kV main supply line breaker, the 10kV subsection and the 10kV standby supply line breaker;
the main protection is provided with current differential protection, and the high backup protection is provided with composite voltage locking overcurrent protection, overload protection and temperature protection;
configuring timing limit overcurrent protection, post-closing acceleration protection and charging protection;
the switch state is controlled, and the situation that two 10kV power supplies supply power to the same transformer at the same time, two 0.4kV power supplies supply power to the same load at the same time, and a generator and the 0.4kV power supplies supply power to the same load at the same time is avoided.
The further technical scheme also comprises that when each fault point occurs, the spare power automatic switching action needs to meet the following requirements:
the automatic switching device of the tail end double power supplies adopts a mutually standby switching mode;
the 0.4kV sectional spare power automatic switching device is faster than the conversion of a tail end dual power automatic switching device;
if ATS is adopted in 0.4kV subsection spare power automatic switching, an automatic switching non-automatic resetting mode is adopted;
the conversion time is 0.4kV subsection spare power automatic switching <10kV subsection spare power automatic switching;
the 10kV subsection spare power automatic switching device and the tail end dual-power automatic switching device do not need to consider time coordination;
ATS4 selects PC stage instead of CB stage.
The above one or more technical solutions have the following beneficial effects:
the technical scheme is a protection and automatic device configuration scheme with high reliability, flexible operation and high automation degree, and can realize rapid fault removal, automatic switching of the standby power supply and avoidance of power grid accidents caused by misoperation.
The technical scheme disclosed by the invention has the advantages of comprehensive protection range, no protection dead zone and capability of quickly removing electrical faults at all fault points. And configuring a line protection device, a main transformer main protection device, a main transformer backup protection device, a spare power automatic switching device and a tail end double power supply switching device.
The technical scheme disclosed by the invention has the advantages that the protection configuration is reliable, the protection configuration is perfectly matched with an automatic device, a standby power supply can be automatically switched in after the fault is removed, and the power supply to the load is not influenced. When any point in the system breaks down, the scheme can quickly remove the fault and automatically input the other power supply, so that seamless connection of load power supply is realized while the fault is removed.
The technical scheme of the disclosure provides a perfect interlocking scheme, and avoids accidents caused by misoperation.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
FIG. 1 is a schematic diagram of a 10kV major power protection project wiring according to an embodiment of the present disclosure;
wherein D1-D7 are simulation fault occurrence points, the power distribution system is in a symmetrical relationship, the following analysis only takes one side as an example, and the other side can be referred to.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict.
The position of a 10kV power distribution room in a power system is far more important than that of a general power distribution room, and the automation degree of the power distribution room is higher. Therefore, a complete scheme is needed, the purposes of reasonable protection configuration of a power distribution room, reasonable logic of an automatic device and complete interlocking are achieved by focusing on the overall situation.
Example one
The embodiment discloses a protection and automatic device configuration system for 10kV major power protection engineering, which comprises:
the 10kV system protection configuration equipment is used for protecting a 10kV main supply line breaker, a 10kV subsection and a 10kV standby supply line breaker;
the main transformer protection configuration equipment is used for main protection configuration current differential protection, high backup protection configuration composite voltage lockout overcurrent protection, overload protection and temperature protection;
the 0.4kV section protection equipment is used for configuring timing-limited overcurrent protection, accelerated protection after closing and charging protection;
the total station trans-interval interlocking device is used for controlling the switching state, and avoiding two 10kV power supplies from supplying power to the same transformer, two 0.4kV power supplies from supplying power to the same load and a generator and the 0.4kV power supplies from supplying power to the same load.
The wiring schematic diagram of the 10kV major power protection project based in this embodiment is shown in fig. 1:
the distribution room comprises a 10kV first bus, a 10kV second bus and a 10kV third bus, a first main supply, a first transformer, a third transformer and a fifth transformer are connected to the 10kV first bus respectively, a first breaker K1 is connected to a line between the first bus and the main supply in series, a sixth breaker K6 is connected to a line between the first transformer and the first bus in series, and the first transformer is connected to the 400v first bus through an ATS.
A branch of the 10kV third bus is connected to the 10kV first bus, a fourth circuit breaker K4 is connected to the branch in series, the 10kV third bus is used as a 10kV first backup switch, the 10kV third bus is further connected to a backup power supply, a third circuit breaker K3 is connected between the backup power supply and the 10kV third bus, the 10kV third bus is further connected with a 10kV second bus, and a fifth circuit breaker K5 is connected between the 10kV third bus and the 10kV second bus in series, and the 10kV second backup switch is used as a 10kV second backup switch.
The 10kV third bus is connected to a sixth transformer, a fourth transformer and a second transformer respectively, and the second transformer is connected to a 400v second bus through an ATS.
The 400v first bus and the 400v second bus are both connected to a dual-power automatic switching device, and the dual-power automatic switching device is connected to a load through a UPS. In a specific embodiment, the 10kV system protection configuration is as follows:
protection at 10kV main supply line breaker (K1, K2)
The 10kV main supply line switch cabinet is provided with 1 protection device, is provided with current quick-break protection and overcurrent protection, and collects 10kV current voltage for protecting a 10kV bus.
When a fault occurs on a 10kV bus, the fault can be quickly removed, and a spare power automatic switching device installed in a 10kV sectional cabinet can be locked. The 10kV standby power supply is prevented from being switched on the 10kV bus with the fault through standby.
Protection at 10kV section (K4, K5)
1 sectional protection and automatic switching device is configured in the 10kV sectional switch cabinet, and current quick-break protection and overcurrent protection are configured to protect a 10kV bus.
And when the voltage of the 10kV bus is detected to be non-voltage and the voltage of the standby 10kV line (K3) is detected, the standby operation is carried out.
If a fault is found after the backup power supply is switched on, the section switch is quickly tripped off. Or the standby 10kV line runs with a 10kV bus, and when a fault occurs on the 10kV bus, the sectional switch is required to be quickly tripped.
Protection of 10kV backup supply line breaker (K3)
The 10kV spare power supply line switch cabinet is not provided with protection, and only 1 circuit breaker operation box is arranged for operation of a K3 circuit breaker.
The main transformer protection configuration is as follows:
each main transformer is provided with 1 main protection device and 1 high backup protection device;
the main protection configures current differential protection.
Reasons for configuring the current differential:
the transformer is a 10kV important transformer;
and calculating the non-short-circuit current as a data support, wherein if the current quick-break protection is configured as the main protection of the transformer, the maximum short-circuit current flowing through the protection device when the current quick-break protection setting value avoids the short circuit at the low-voltage side is lower than the two-phase short-circuit current at the installation position of the protection device in the minimum operation mode of the system. The sensitivity of the current snap-off protection is not known to be satisfied. In conservative consideration of the project, 1 differential protection device is configured.
The high backup protection is configured with composite voltage blocking overcurrent protection, overload protection and temperature protection. In the project, if the fault outgoing line is between the transformer low-voltage circuit breaker and the CT, the differential protection does not act, and the low backup protection does not act. The fault can only be removed with high side overcurrent protection.
The low backup protection utilizes the protection function of a 0.4kV circuit breaker and is provided with current quick-break protection, timing current-limit quick-break protection, overcurrent protection and low-voltage side single-phase grounding protection. The low backup protection function may be integrated in the main transformer differential or main transformer high backup protection.
0.4kV section protection:
1 sectional protection and automatic switching device is configured in a 0.4kV sectional switch cabinet, and timing over-current protection, acceleration protection after closing and charging protection are configured.
Once the manual or protection switching-on is carried out on the fault bus, the protection action is accelerated after the switching-on, and the sectional circuit breaker is tripped, so that the condition that the two sections of 0.4kV buses are simultaneously powered off due to the tripping of another main transformer low-voltage circuit breaker is avoided.
In a specific implementation example, an automatic switching scheme of a 0.4kV standby power supply is as follows:
the 0.4kV section spare power automatic switching device is locked when the following conditions occur:
a. when jumping off K6 locally or remotely;
b. when jumping off K10 on site or remotely;
c. when jumping off K8 on site or remotely;
d.K10 automatically jumps due to overcurrent action.
The 0.4kV sectionalized backup power automatic switch should not be locked when the following occurs:
a. when the main protection of the transformer is tripped out of K6 and K10 simultaneously;
b. and other 0.4kV I buses are in power failure, and the condition of spare power automatic switching is met.
Total station protection tripping and locking backup power switching schedule
Description of the drawings: v: a protection action; x: the protection does not act.
Total station fault point trip analysis
Description of the drawings: v: there is a possibility of protective action, and the design institute needs to consider hard-wired connection; x: the protection does not act.
Logic coordination of each-stage spare power automatic switching device and dual-power switching device
Total station spare power automatic switching on-off circuit breaker summary table
The time logic mainly relates to three-level matching of a 10kV spare power automatic switching device, a 0.4kV spare power automatic switching device and a tail end dual power automatic switching device. Because the power generating cars are used in the conference, the double power supply switching at the power generating car access part only considers manual operation, so the power generating cars are not in the discussion range.
In the current main wiring mode, when each fault point occurs, the backup power automatic switching action is shown in the following table:
description of the invention: v: a switching action occurs; x: no conversion takes place. Painting contents: for unreasonable reasons. The preconditions for the above table analysis:
the spare power automatic switching action time: 0.4kV subsection spare power automatic switching is less than 10kV subsection spare power automatic switching;
0.4kV subsection spare power automatic switching device < tail end double power automatic switching device.
Correlation analysis
a. The automatic switching device of the tail end double power supplies adopts a mutually standby switching mode
The terminal dual power supply has three switching modes, 1) self-switching and self-resetting: when the main loop loses power, the main loop is automatically thrown to a standby loop; after the main loop is powered on, the main loop is automatically recovered. Under the condition, when the fault is relieved and the power supply is recovered, the tail end dual-power automatic switching device automatically recovers to the main loop, so that the power failure is caused again and the device is not adopted. 2) Self-throwing and non-self-resetting; when the main loop loses power, the main loop is automatically thrown to a standby loop; after the main loop is powered on, the main loop can not be recovered. Because the number of the tail end double-power-supply automatic switching devices at the tail end is large, hundreds of double-power-supply automatic switching devices are distributed in various places of a building, each converted double-power supply needs to be manually reset during a break, and the workload is difficult to guarantee and unreasonable. 3) The mutual backup is as follows: the main circuit and the standby circuit are not divided, when the circuit 1 is powered off, the circuit 2 is automatically switched when the circuit is powered on; after switching, only when the loop 2 is power-off and the loop 1 is power-on, automatic switching is performed; the power supply circuit has no self-reset secondary power-off and does not need to be manually reset in a self-switching non-self-reset mode, and is suitable for application requirements.
b.0.4kV subsection spare power automatic switching device conversion faster than tail end dual power automatic switching device
On one hand, when D7 fails, the double power supplies at the tail end are expected to be switched quickly, and the power-off time is shortened. In the current power distribution scheme, the critical loads requiring zero flashing are all supplied with power by a terminal UPS, and the loads (such as an air conditioner) directly supplied with power by the terminal dual-power automatic switching device have no obvious difference on the power failure time of 0.1s or 3 s.
On the other hand, if the conversion speed of the automatic terminal double-power-supply switching device is higher than 0.4kV subsection spare power automatic switching device, when the #1 transformer loses power due to faults of D1, D2, D4 and D5, a large number of automatic terminal double-power-supply switching devices are converted, and excessive variables are to be avoided by power supply guarantee.
And the switching time of the automatic switching device of the double power supplies at the tail end is set to be slower than the switching time of the spare power supply of the 0.4kV section, when the No. 1 transformer is out of power caused by faults of D1, D2, D4 and D5, the spare power supply of the 0.4kV section is switched first, the No. 2 transformer supplies power to the 0.4kV 1# bus through the section, and a large number of automatic switching devices of the double power supplies at the tail end do not need to be switched.
And if ATS is adopted in the c.0.4kV subsection spare power automatic switching, an automatic switching non-automatic resetting mode is adopted.
The ATS power supply conversion system has two automatic conversion modes, 1) self-switching and self-resetting: d1, D2, D4 and D5 are automatically switched after faults occur; but when the fault is recovered, the ATS self-resets, which results in a secondary power outage. Should not be used. 2) Self-throwing and non-self-resetting; the secondary power failure caused by self-reset in the self-switching and self-reset mode can be avoided.
d. Conversion time 0.4kV subsection spare power automatic switching <10kV subsection spare power automatic switching
The 10kV subsection spare power automatic switching is faster than the 0.4kV subsection spare power automatic switching, so that multiple 0.4kV subsections can be prevented from being switched during D1 fault.
However, considering that the terminal dual-power automatic switching device needs to be slower than the 0.4kV sectional backup power automatic switching device, if the 0.4kV sectional backup power automatic switching device is slower than the 10kV sectional backup power automatic switching device, the switching time of the terminal dual-power automatic switching device is slower.
Therefore, the provisional conversion time is 0.4kV subsection spare power automatic switching <10kV subsection spare power automatic switching.
The e.10kV sectional spare power automatic switching device and the tail end double power automatic switching device do not need to consider time coordination.
From the view of the automatic switching device of the tail-end double power supplies, the faults are a power-off fault of a certain circuit incoming line loop and a power-off fault of a bus. The fault of the incoming line loop is ensured by the conversion of a tail end dual-power automatic switching device body. The 0.4kV subsection spare power automatic switching and the 10kV subsection spare power automatic switching both guarantee bus power supply, the 0.4kV subsection spare power automatic switching is faster than the 10kV subsection spare power automatic switching, namely, the bus power supply is guaranteed through conversion of the 0.4kV subsection spare power automatic switching, and as long as the tail end double power supply automatic switching device is slower than the 0.4kV subsection spare power automatic switching, the time when the 10kV subsection spare power automatic switching is converted is not considered.
The ATS4 adopts the PC stage in consideration of its fast switching, simplicity and reliability, and the CB stage has a long switching time and low reliability.
ATS4 adopts manual switching.
The switching time of the ATS4 is related to the generator supply mode. If the oil engine is cold-standby, the ATS4 does not need to consider the switching time coordination problem in consideration of the starting time of the oil engine.
The oil engine is hot and standby, the oil engine has priority, the automatic switching time of the ATS4 is faster than that of 0.4kV subsection standby power automatic switching, and once the 1# bus is power-off, the bus is switched to the generator side. According to the design intention, the input priority of the oil engine is the last, so that the oil engine is prevented from being powered preferentially, and the oil engine is more reasonable in cold standby or hot standby and the mains supply is preferred.
The oil engine is hot and spare, the mains supply is preferred, the automatic switching time of the ATS4 is slower than that of 0.4kV subsection spare power automatic switching, after the 1# bus is out of power, the 0.4kV subsection spare power automatic switching acts, the 1# bus is connected to the 2# bus in a subsection mode to be powered on, and the ATS4 does not need to be switched.
However, there is a problem that when D6 fails, the PC level ATS automatically switches to connect the generator car to the failure. The ATS4 can only adopt manual switching.
The total station span interval interlocking scheme:
k1 and K3 are interlocked; two paths of 10kV power supplies are prevented from supplying power to the same transformer at the same time.
Only two of K10, K8 and K10' can be combined at the same time; two paths of 0.4kV power supplies are prevented from supplying power to the same load at the same time.
K11 interlocks with K8. The generator and the 0.4kV power supply are prevented from supplying power to the same load at the same time.
Example two
The embodiment aims to provide a protection and automatic device configuration method for 10kV major power protection engineering, which comprises the following steps:
protecting the 10kV main supply line breaker, the 10kV subsection and the 10kV standby supply line breaker;
the main protection is provided with current differential protection, and the high backup protection is provided with composite voltage locking overcurrent protection, overload protection and temperature protection;
configuring timing limit overcurrent protection, post-closing acceleration protection and charging protection;
the switch state is controlled, and the situation that two 10kV power supplies supply power to the same transformer, two 0.4kV power supplies supply power to the same load and a generator and the 0.4kV power supply power to the same load at the same time is avoided.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Although the present disclosure has been described with reference to specific embodiments, it should be understood that the scope of the present disclosure is not limited thereto, and those skilled in the art will appreciate that various modifications and changes can be made without departing from the spirit and scope of the present disclosure.
Claims (9)
1.10kV major power protection project's protection and automatic device configuration system, characterized by includes:
the 10kV system protection configuration equipment is used for protecting a 10kV main supply line breaker, a 10kV subsection and a 10kV standby supply line breaker;
the main transformer protection configuration equipment is used for main protection configuration current differential protection, high backup protection configuration composite voltage lockout overcurrent protection, overload protection and temperature protection;
the 0.4kV section protection equipment is used for configuring timing time limit overcurrent protection, post-closing acceleration protection and charging protection;
the total station trans-interval interlocking device is used for controlling the switching state, and avoiding two 10kV power supplies from supplying power to the same transformer, two 0.4kV power supplies from supplying power to the same load and a generator and the 0.4kV power supply from supplying power to the same load;
the 10kV system protection configuration equipment comprises a sectional protection and automatic switching device which is configured at a 10kV sectional switch cabinet, and is configured with current quick-break protection and overcurrent protection for protecting a 10kV bus;
the main transformer protection configuration equipment comprises: the low backup protection device is configured with current quick-break protection, timing current-limit quick-break protection, overcurrent protection and low-voltage side single-phase grounding protection by utilizing the protection function of the 0.4kV circuit breaker;
the 0.4kV section protection equipment comprises a section protection and automatic switching device which is configured at a 0.4kV section switch cabinet, and is configured with timing over-current protection, accelerated protection after closing and charging protection;
the protection and automation device configuration system also includes a dual power supply automatic switching device at the end.
2. The system for protection and automation equipment configuration in 10kV major power protection project as claimed in claim 1, wherein the 10kV system protection configuration equipment further comprises a protection device configured at the 10kV main supply line switch cabinet, configured with current quick-break protection and overcurrent protection for protecting the 10kV bus;
when the fault occurs on the 10kV bus, the fault is removed, and the spare power automatic switching device installed in the 10kV sectional cabinet is locked, so that the 10kV spare power supply is prevented from switching on the 10kV bus with the fault through spare power.
3. The protection and automation device configuration system for 10kV major power protection project as claimed in claim 1, characterized in that the 10kV system protection configuration equipment is provided with a segment protection and automatic switching device at the 10kV segment switch cabinet, which is provided with a current quick-break protection and an overcurrent protection for protecting the 10kV bus;
when the voltage of the 10kV bus is detected to be non-voltage and the voltage of the standby 10kV line is detected, the standby operation is carried out;
if a fault is found after the backup power supply is switched on, the section switch is quickly tripped, or the backup 10kV line runs with a 10kV bus, and when the fault occurs on the 10kV bus, the section switch is tripped.
4. A protection and automation configuration system for 10kV major protection engineering as claimed in claim 1, characterized in that the 10kV system protection configuration device further comprises a circuit breaker operation box configured at the 10kV backup line switch cabinet for operation of the circuit breaker.
5. The protection and automation device configuration system for 10kV major power protection project according to claim 1, wherein the main transformer protection configuration device further comprises: a main protection device and a high backup protection device;
the main protection device is used for main protection configuration current differential protection, current quick-break protection is configured as transformer main protection, and when a current quick-break protection setting value avoids short circuit at a low-voltage side, the maximum short-circuit current flowing through the protection device is lower than two-phase short-circuit current at the installation position of the protection device in a system minimum operation mode;
the high backup protection device is configured with composite voltage lockout overcurrent protection, overload protection and temperature protection.
6. The system for protection and automatic device configuration in 10kV major power protection project according to claim 1, wherein the 0.4kV section protection device is configured with a section protection and automatic switching device at the 0.4kV section switch cabinet, and is configured with timing-limited overcurrent protection, acceleration protection after closing and charging protection;
when a fault bus is manually or protected to be switched on, the protection action is accelerated after the switch-on, and the sectional circuit breaker is tripped, so that the condition that the two sections of 0.4kV buses are simultaneously powered off due to the tripping of another main transformer low-voltage circuit breaker is avoided.
7. The system for protection and automation equipment configuration in 10kV major power protection project according to claim 1, further comprising an automatic throw-in device of 0.4kV standby power for:
when a certain set switch is tripped off locally or remotely or automatically due to overcurrent action, the 0.4kV sectional spare power automatic switch is locked;
when the main protection of the transformer simultaneously trips the sixth circuit breaker and the tenth circuit breaker, or when other 0.4kV I buses lose power and the condition of the spare power automatic switching is met, the 0.4kV sectional spare power automatic switching should not be locked.
A protection and automatic device configuration method for 8.10kV major power protection project, based on the protection and automatic device configuration system for 10kV major power protection project according to any one of claims 1 to 7, characterized by comprising:
when the fault occurs on the 10kV bus, the fault is removed, and a spare power automatic switching device arranged in the 10kV sectional cabinet is locked, so that a 10kV spare power supply is prevented from switching on the 10kV bus with the fault through spare power;
when the voltage of the 10kV bus is detected to be non-voltage and the voltage of the standby 10kV line is detected, the standby operation is carried out; if a fault is found after the backup power supply is switched on, the section switch is quickly tripped, or the backup 10kV line runs with a 10kV bus, and when the fault occurs on the 10kV bus, the section switch is tripped;
when a fault bus is manually or protected to be switched on, the protection action is accelerated after the switch-on, and the sectional circuit breaker is tripped, so that the condition that two sections of 0.4kV buses are simultaneously de-energized due to the tripping of another main transformer low-voltage circuit breaker is avoided;
when a certain set switch is tripped off locally or remotely or automatically due to overcurrent action, the 0.4kV sectional spare power automatic switch is locked; when the transformer main protection simultaneously trips the sixth circuit breaker and the tenth circuit breaker or other 0.4kV I bus power failure conditions meet the condition of spare power automatic switching input, the 0.4kV subsection spare power automatic switching should not be locked.
9. The method for protecting and configuring the automatic device in the 10kV major power protection project according to claim 8, further comprising the following steps of when each fault point occurs:
the tail end dual power supply automatic switching device adopts a mutually standby switching mode;
the 0.4kV subsection spare power automatic switching is faster than the conversion of a tail end dual power automatic switching device;
0.4kV subsection spare power automatic switching adopts ATS, and then adopts an automatic switching non-automatic resetting mode;
the conversion time is 0.4kV subsection spare power automatic switching <10kV subsection spare power automatic switching;
the 10kV subsection spare power automatic switching device and the tail end double-power automatic switching device do not need to consider time matching;
ATS4 selects PC stage instead of CB stage.
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