CN111416330A - Intelligent on-site unit with on-site protection function, on-site protection method and medium - Google Patents
Intelligent on-site unit with on-site protection function, on-site protection method and medium Download PDFInfo
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- CN111416330A CN111416330A CN202010335114.7A CN202010335114A CN111416330A CN 111416330 A CN111416330 A CN 111416330A CN 202010335114 A CN202010335114 A CN 202010335114A CN 111416330 A CN111416330 A CN 111416330A
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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
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
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- H02H1/0061—Details of emergency protective circuit arrangements concerning transmission of signals
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Abstract
The embodiment of the invention discloses an intelligent in-place unit with an in-place protection function, an in-place protection method and a medium. The core device of the intelligent on-site unit hardware comprises an FPGA and a CPU; the FPGA is connected with the CPU through an embedded Ethernet; the FPGA is used for sending an open protection function signal to the CPU through the embedded Ethernet when judging that the protection device connected with the intelligent local unit has a fault; and the CPU is used for starting the local interval local protection function when receiving the open protection function signal and providing a protection function for a target interval where the intelligent local unit is located through the local protection function. According to the scheme of the embodiment of the invention, the function of providing backup protection for the target interval where the intelligent on-site unit is located is realized when the protection device fails, and the problem that when the protection device connected with the existing intelligent unit without the protection function fails, the main protection is lost at the corresponding interval, the fault of the interval has to be removed by the backup protection of the adjacent interval, and the power failure range is expanded is solved.
Description
Technical Field
The embodiment of the invention relates to the technical field of process level equipment of an intelligent substation or an intelligent power distribution station, in particular to an intelligent on-site unit with an on-site protection function, an on-site protection method and a medium.
Background
In intelligent substation and intelligent distribution station, process layer equipment mainly includes: merging unit, intelligent terminal and merging unit intelligent terminal integrated device (intelligent merging unit for short); the merging unit samples and processes digital quantity output by sensors such as a current transformer or a voltage transformer and the like, converts the digital quantity into an IEC61850-9-2(SV) message, and outputs the message to an intelligent device (IED) of a process layer network or a bay layer through optical fibers; the intelligent terminal is mainly used for collecting and monitoring the position and state alarm information of primary equipment in an interval, intelligently controls the equipment and has the function of preventing misoperation; merging unit intelligent terminal integrated device combines together merging unit and intelligent terminal, possesses characteristics such as miniaturization, platformization, commonality and economic nature to the optic fibre quantity between process level equipment and the wall equipment has been reduced.
At the present stage, the intelligence synthesis unit does not have an in-situ protection function, and can only protect each interval in the transformer substation and the distribution substation through the interval layer equipment, such as a protection device.
In the prior art, when a protection device for protecting the interval breaks down, the protection of the interval is lost, and a large-scale power failure is caused.
Disclosure of Invention
Embodiments of the present invention provide an intelligent on-site unit having an on-site protection function, an on-site protection method, and a medium, so as to protect a corresponding interval when a protection device connected to the intelligent on-site unit fails.
In a first aspect, an embodiment of the present invention provides an intelligent on-site unit with an on-site protection function, where a core device includes: FPGA (Field Programmable Gate Array) and CPU (Central Processing Unit); the FPGA is connected with the CPU through an embedded Ethernet;
the FPGA is used for sending an open protection function signal to the CPU through the Ethernet port when the protection device connected with the intelligent on-site unit is determined to have a fault;
and the CPU is used for starting an in-place protection function when the open protection function signal is received, and providing protection for a target interval where the intelligent in-place unit is located through the in-place protection function.
In a second aspect, an embodiment of the present invention further provides an in-situ protection method, where the method includes:
judging the state of a protection device connected with the intelligent on-site unit;
and when the protection device connected with the intelligent on-site unit is determined to have a fault, opening the on-site protection function of the intelligent on-site unit, and providing protection for the target interval in which the intelligent on-site unit is positioned through the on-site protection function.
In a third aspect, embodiments of the present invention further provide a storage medium containing computer-executable instructions, which when executed by a computer processor, are configured to perform a protection-in-place method according to any one of the embodiments of the present invention.
According to the intelligent on-site unit provided by the embodiment of the invention, when the FPGA determines that the protection device connected with the intelligent on-site unit has a fault, an open protection function signal is sent to a CPU of the intelligent on-site unit; when the CPU receives the open protection function signal, the local protection function is started, so that the purpose that the target interval where the intelligent local unit is located is protected when the protection device breaks down is achieved, and the problem that when the protection device connected with the existing intelligent unit without the protection function breaks down, the main protection is lost at the corresponding interval, the interval fault has to be removed by the backup protection of the adjacent interval, and the power failure range is expanded is solved.
Drawings
FIG. 1 is a schematic structural diagram of an intelligent on-site unit with on-site protection function according to a first embodiment of the present invention;
FIG. 2 is a flow chart of a method for in-place protection according to a second embodiment of the present invention;
FIG. 3 is a flowchart illustrating operation of an intelligent on-site unit according to a third embodiment of the present invention;
FIG. 4 is a flow chart of a method of in-place protection in a fourth embodiment of the present invention;
fig. 5 is a wiring diagram of a110 KV substation in the fourth embodiment of the present invention.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad invention. It should be further noted that, for convenience of description, only some structures, not all structures, relating to the embodiments of the present invention are shown in the drawings.
Example one
Fig. 1 is a schematic structural diagram of an intelligent on-site unit according to an embodiment of the present invention, which is applicable to a case where protection is provided for a corresponding interval by the intelligent on-site unit when a protection device connected to the intelligent on-site unit fails, and in particular, referring to fig. 1, the intelligent on-site unit 100 specifically includes: FPGA110 and CPU120, wherein FPGA110 and CPU120 are connected through embedded Ethernet 130.
Specifically, the FPGA110 is configured to send an open protection function signal to the CPU120 through the embedded ethernet 130 when it is determined that a protection device connected to the intelligent on-site unit has a fault; the CPU120 is configured to enable the in-place protection function when receiving the open protection function signal, and provide protection for the fault of the target interval where the intelligent in-place unit is located through the in-place protection function.
Wherein, the target interval may be an interval corresponding to a single-interval protection device, for example, a line interval, a used variable interval, a reactor interval, a capacitor interval, or the like; the intervals corresponding to the multi-interval protection devices, for example, the intervals on each side of the main transformer or the intervals on each branch of the bus, may also be provided, and the embodiment of the present invention is not limited thereto. It will be appreciated that for a single bay protection device, the protection device is connected to only one intelligent on-site unit; for the multi-interval protection device, the protection device may be connected to a plurality of intelligent on-site units, for example, 12 or 24, etc., at the same time, which is not limited in the embodiments of the present invention.
In a specific implementation, the FPGA110 performs GOOSE (Generic Object-Oriented Substation Event) or SV (Sampled Value) communication with a protection device through two hundred million transceiving ports 111 and 112. When the protection device is not in fault, the intelligent on-site unit 100 may receive a GOOSE handshake signal sent by the protection device through the hundred mega receiving optical port 111, and at this time, the intelligent on-site unit determines that the protection device is normal in function; when the protection device fails, the intelligent on-site unit 100 cannot receive the GOOSE handshake signal sent by the protection device through the hundred mega receiving optical port 111, and at this time, the intelligent on-site unit judges that the protection device fails.
Optionally, when the FPGA110 cannot detect the GOOSE handshake signal sent by the protection device, it is determined that the protection device connected to the intelligent on-site unit fails.
Further, the FPGA110 sends an open protection function signal to the CPU120 through the embedded ethernet 130, and after the CPU120 receives the open protection function signal sent by the FPGA110, the protection function of the intelligent on-site unit is immediately enabled, so as to implement a function of providing protection for an interval where the intelligent on-site unit is located. Wherein, the protection function of the intelligent in-place unit includes but is not limited to: three-section type interphase or grounding distance protection, three-section type combined voltage direction overcurrent protection, two-section type zero sequence direction overcurrent protection, reclosing, post-acceleration protection and the like.
Optionally, the CPU120 is specifically configured to, when the target interval fails, identify a failure direction and a section of the target interval through the distance protection element and/or the direction overcurrent protection element, and perform a corresponding protection action. The distance protection element can be three-section type interphase or grounding distance protection; the directional overcurrent protection element can be three-section type composite voltage directional overcurrent protection or two-section type zero sequence directional overcurrent protection. It should be noted that the distance protection and the direction overcurrent protection related in the embodiment of the present invention may further include other protection elements, which are not limited in the embodiment of the present invention.
It should be noted that, in the embodiment of the present invention, when the protection device fails, the protection device cannot provide protection for the failure of the target interval, and at this time, the intelligent on-site unit may provide protection for the failure of the target interval. Specifically, when the target interval is failed, the failure direction and section of the target interval can be identified by the distance protection element and/or the direction overcurrent protection element, so that corresponding protection action is performed.
It should be further noted that what protection method is used to protect the target interval in the embodiment of the present invention is related to the type of the target interval, and for example, if the target interval is a line interval, the line interval may be protected by three-stage interphase and/or ground distance protection, three-stage combined voltage blocking direction overcurrent protection, and two-stage zero-sequence direction overcurrent protection; embodiments of the present invention will be described in detail later.
In the intelligent on-site unit in this embodiment, when the FPGA included in the intelligent on-site unit determines that a protection device connected to the intelligent on-site unit has a fault, an open protection function signal is sent to a CPU of the intelligent on-site unit; when the CPU receives the open protection function signal, the local protection function is started, the function of providing protection for the fault of the target interval where the intelligent local unit is located is realized when the protection device has a fault, and the problem that when the protection device connected with the existing intelligent unit without the protection function has a fault, the corresponding interval loses main protection, the fault of the interval has to be removed by backup protection of the adjacent interval, and the power failure range is expanded is solved.
On the basis of the above technical solution, the FPGA110 is further configured to time the intelligent on-site unit according to the time tick signal when the time tick signal is obtained through the time tick 113; when the time tick signal is not obtained through the time tick 113, the GOOSE time tick is obtained from the GOOSE heartbeat packet sent by the protection device, and the time tick is used for carrying out time tick on the intelligent local unit.
The time setting port 113 may be an electronic B code time setting port, and the time setting signal received through the time setting port may be a time code in an IRIG-B (Inter Range Instrumentation Group-B) format. It should be noted that the time slot related in the embodiment of the present invention may also be another form of time slot, which is not limited in the embodiment of the present invention.
Specifically, when the FPGA110 acquires the time tick signal through the time tick 113, the intelligent on-site unit can be time-ticked directly through the time tick signal; when the FPGA110 cannot obtain the time tick through the time tick 113, the GOOSE time tick can be obtained from the GOOSE heartbeat packet sent by the protection device, and the time tick is performed on the intelligent local unit by using the GOOSE time tick.
The advantage of setting like this is that both can obtain the time tick through the time tick, also can obtain the GOOSE time tick from the GOOSE heartbeat message that protection device sent, can provide the time tick function to intelligent unit on the spot under the condition that does not have the external clock source.
Optionally, the FPGA110 related in the embodiment of the present invention is further connected to the PTCT module 114 and the DIDO module 115, so as to implement AD (Analog Digital) sampling and SV sending of the PTCT module 114, DI (Digital Input) acquisition and GOOSE sending and DO (Digital output) driving functions of the DIDO module 115. The PTCT module 114 includes 4 PTs (Potential transformers) and 4 CTs (current transformers); the DIDO module 115 includes 8 DI and 6 DO.
Optionally, the CPU120 according to the embodiment of the present invention is further connected to an HMI (Human Machine Interface) module 123, where the HMI module may be L ED (L light Emitting Diode).
Optionally, the CPU120 according to the embodiment of the present invention is further connected to two ethernet ports 121 and 122, and is configured to connect a background and a maintenance software, so as to complete a management and maintenance function on the intelligent local unit, where the background may be an SCADA system supporting an IEC61850 protocol or a 103 protocol.
The intelligent on-site unit has the advantages that the intelligent on-site unit has the function of an intelligent unit and has the function of on-site protection.
Example two
Fig. 2 is a flowchart of an in-place protection method according to a second embodiment of the present invention, which may be applied to a case where protection is provided for a corresponding interval by an intelligent in-place unit when a protection device fails, and the method may be performed by an in-place protection process, and the device may be implemented by software and/or hardware and integrated into a computer device. Specifically, referring to fig. 2, the method specifically includes the following steps:
and S210, judging the state of the protection device connected with the intelligent on-site unit.
Wherein, the state of the protection device connected with the intelligent on-site unit can comprise: failed or normal.
Optionally, the determining the state of the protection device connected to the intelligent on-site unit may include: judging whether the intelligent local unit can detect a GOOSE handshake signal sent by the protection device; if not, judging that the protection device connected with the intelligent on-site unit has a fault.
Specifically, when the protection device is not in fault, the intelligent local unit receives GOOSE handshake signals sent by the protection device connected to the intelligent local unit at regular time intervals (for example, 20 milliseconds), and at this time, the protection device connected to the intelligent local unit operates normally. And once the protection device fails, stopping sending the GOOSE handshake signal to the intelligent local unit, wherein the protection device connected with the intelligent local unit fails.
S220, when the protection device connected with the intelligent on-site unit is determined to have a fault, the on-site protection function of the intelligent on-site unit is opened, and protection is provided for the target interval where the intelligent on-site unit is located through the on-site protection function.
Specifically, when it is determined that the protection device connected to the intelligent on-site unit fails, the protection device cannot achieve the protection function for the target interval, and at this time, the intelligent on-site unit opens the on-site protection function, thereby achieving the purpose of providing the protection function for the target interval where the intelligent on-site unit is located.
Optionally, the in-situ protection method in this embodiment may further include: and when the protection device connected with the intelligent on-site unit is determined to be normal, locking the on-site protection function of the intelligent on-site unit, and switching to a state of using the protection device to realize the protection of the interval.
Specifically, when the intelligent local unit receives a GOOSE handshake signal sent by a protection device connected with the intelligent local unit, the local protection function of the intelligent local unit is locked, and the protection device continues to protect the fault of the target interval where the intelligent local unit is located.
It should be noted that, when the intelligent local unit related in the embodiment of the present invention receives the GOOSE handshake signal sent by the protection device connected to the intelligent local unit, only the function of the intelligent synthesizing unit is executed, that is, the intelligent local unit undertakes local AI/DI acquisition at the present interval and sends a GOOSE/SV message to the power server, and executes a GOOSE trip/close command from the protection device; when the protection device connected with the intelligent on-site unit breaks down, the function of the intelligent unit is executed, and the on-site protection function is also executed, so that the function of providing protection for the faults at corresponding intervals is realized.
According to the technical scheme of the embodiment, when the protection device connected with the intelligent on-site unit breaks down, the on-site protection function of the intelligent on-site unit is opened to realize the protection of the target interval; when the protection device connected with the intelligent on-site unit recovers to be normal, the on-site protection function of the intelligent on-site unit is locked, so that the purpose that the intelligent on-site unit is located at a target interval is protected when the protection device breaks down is achieved, and the problem that when the protection device connected with the existing intelligent unit without the protection function breaks down, main protection is lost at a corresponding interval, the interval fault has to be removed by backup protection of an adjacent interval, and the power failure range is expanded is solved.
EXAMPLE III
In this embodiment, on the basis of the foregoing embodiment, the embodiment of the present invention is refined, and specifically, the in-place protection method according to the embodiment of the present invention may further include: if the time setting signal is obtained through the time setting port, the intelligent on-site unit is subjected to time setting according to the time setting signal; if the time setting signal can not be obtained through the time setting port, obtaining a GOOSE time scale from a GOOSE heartbeat message sent by the protection device, and carrying out time setting on the intelligent on-site unit by utilizing the GOOSE time scale.
The advantage of setting up like this is that intelligence unit in the spot both can be through obtaining the time tick signal to the time tick, also can obtain the GOOSE time tick from the GOOSE heartbeat message that protection device sent, therefore can still realize the time tick function to intelligence unit in the spot under the condition that does not have the external clock source.
For a better understanding of the embodiments of the present invention, fig. 3 illustrates a workflow diagram of an intelligent on-site unit, which mainly includes the following steps:
and S310, electrifying to operate.
And S320, executing the function of the intelligence synthesis unit.
S330, whether the B code is received or not.
The electrical B code is a time tick signal involved in the embodiment of the present invention.
If yes, go to S340;
if not, go to S350.
And S340, analyzing the electric B code and setting time.
Specifically, the intelligent local unit analyzes the received electronic B code and time synchronization is carried out according to an analysis result.
And S350, GOOSE time scale time synchronization.
Specifically, if the intelligent local unit does not receive the electronic B code, the GOOSE timing mark is obtained from the GOOSE heartbeat message sent by the protection device, and timing is performed according to the GOOSE timing mark.
And S360, whether the GOOSE handshake signal is received or not.
If not, executing S370;
if yes, go to step S320.
And S370, starting the local protection function.
It can be seen from the above examples that the intelligent on-site unit related in the embodiments of the present invention not only has the function of an intelligent unit, but also can enable an on-site protection function when the GOOSE handshake signal is not received; meanwhile, time synchronization can be realized in various modes, and the intelligent local unit is ensured to have a correct time scale for recording information such as protection actions and fault recording.
Example four
Fig. 4 is a flowchart of an in-place protection method in a fourth embodiment of the present invention, and this embodiment refines the embodiment of the present invention on the basis of the foregoing embodiment, and specifically, protecting the target interval by the in-place protection function may include: when the target interval has a fault, the fault direction and the section of the target interval are identified through the distance protection element and/or the direction overcurrent protection element, and corresponding protection actions are executed. Referring to fig. 4, the method specifically includes the following steps:
and S410, judging the state of the protection device connected with the intelligent on-site unit. Specifically, whether the intelligent on-site unit can receive a GOOSE handshake signal sent by the protection device is judged; and if not, determining that the protection device connected with the intelligent on-site unit has a fault.
And S420, when the protection device connected with the intelligent on-site unit is determined to have a fault, starting an on-site protection function of the intelligent on-site unit, and providing protection for the target interval where the intelligent on-site unit is located through the on-site protection function.
And S430, when the target interval has a fault, identifying the fault direction and section of the target interval through the distance protection element and/or the direction overcurrent protection element, and executing corresponding protection action.
The distance protection element can be three-section type interphase or grounding distance protection; the directional overcurrent protection element can be three-section type composite voltage directional overcurrent protection or two-section type zero sequence directional overcurrent protection. It should be noted that the distance protection and the overcurrent protection related in the embodiment of the present invention may further include other protection elements, which are not limited in the embodiment of the present invention.
In particular, different protection functions of the intelligent on-site unit may be configured for different intervals. For example, the fault direction and section can be identified by the directional element of the directional overcurrent protection and the time-limited cooperation of the three-stage overcurrent protection; the direction of failure and the section can also be identified by the distance protection element.
Illustratively, the intelligent in-place unit may be configured with protection functions via table 1.
TABLE 1 protection constant value list table of intelligent local unit
For a better understanding of the embodiments of the present invention, the embodiments of the present invention exemplify how to configure the protection functions of the intelligent on-site units corresponding to different types of bays:
1. line spacing: for a line interval, if there is an independent power supply on the opposite side of the line, when the line is over-current, the fault point may not be in the line interval, but on the back side of the line, the short-circuit current flowing through is provided by the power supply on the opposite side of the line, so the protection configuration of the line interval may include one or more of the following configurations:
(1) and three-section type interphase/grounding distance protection: the protection constant value of the distance I section is set to be 80% of the total length impedance of the circuit, the protection constant value of the distance II section is set to be 120% of the total length impedance of the circuit, the protection constant value of the distance III section is set to be 150% of the total length impedance of the circuit, and the time delay can be set to be 50ms, 500ms and 1s respectively. On a110 KV line, both interphase distance protection and grounding distance protection are put into use; on 35KV and 10KV lines, only the inter-phase distance protection is put into use.
(2) And three-section type over-current protection in the locking direction by means of complex voltage: the directional element can be a 90-degree power directional element or a positive sequence directional element, the repressing locking element comprises a low-voltage locking element and a negative sequence voltage locking element, the fixed value of the overcurrent I section is set according to 1.2 times of the short-circuit current obtained by calculating two-phase short circuit at the tail end of the circuit, the fixed value of the overcurrent II section is set according to 0.8 time of the short-circuit current, the fixed value of the overcurrent III section is set according to 0.5 time of the short-circuit current, the time delay can be respectively set to 100ms, 500ms and 1s, the directional element of the overcurrent I section is fixedly switched on, the directional element of the III section is fixedly switched on, and the directional element of the II section can be selectively switched on or not according to the situation.
(3) Two-section zero sequence direction overcurrent protection: the zero sequence directional element can be switched on and off, and the fixed value and the time delay of the two-section zero sequence overcurrent protection can be set according to the actual system parameters to be used as the backup protection of the single-phase earth fault.
2. The variable spacing and reactor spacing used: because the opposite sides of the used variable interval and the reactor interval are not provided with independent power supplies generally, when the interval is in overcurrent, a fault point is necessarily in the interval, and the fault point must be tripped when the overcurrent is generated. The situation of the intelligent on-site unit protection function configuration can be spaced from the line, but the specific setting value is slightly different, the setting values of the three-section interphase distance protection and the grounding distance protection are 80%, 120% and 150% of the inductance of the transformer leakage reactance or the reactor, and the directional element of the three-section type complex pressure locking direction overcurrent protection can be omitted.
3. Capacitor spacing: for the capacitor interval, there is also no independent power supply on the opposite side, and if the interval is over-current, the fault point must be in the interval. However, because the capacitor is adopted, the distance protection and the direction element are not applicable any more, the three-section distance protection is required to be withdrawn, only the three-section overcurrent protection is required to be put into, and the re-pressing locking element and the direction element are not required to be put into.
4. The interval of each side of the main transformer is as follows: a system power supply is arranged on the back side of the high-voltage side at intervals, and a distributed power supply or a small power supply can be connected to the back side of the middle-low voltage side, so that distance protection and overcurrent protection directional elements can be put into the back side of the high-voltage side, and the direction of the directional elements points to the transformer. The fixed value of the three-section distance protection is respectively set according to 80%, 120% and 150% of leakage reactance of the main transformer.
5. Each interval of the bus: because the intelligent on-site units of each interval of the bus are necessarily simultaneously connected with the protection devices or the protection modules of other intervals (such as line protection, used transformer protection, main transformer protection and the like), the intelligent on-site units connected with the bus intervals only need to be configured with protection functions according to other interval types. It should be noted that, in this case, when the bus fails, the protection section of the intelligent on-site unit with the directional line interval or the main transformer interval does not operate, and the fault can be removed only by means of the backup section (section II or section III) in a delayed manner.
It should be noted that in the prior art, the intelligent units for multi-interval protection are usually connected through the optical fiber ring network, and this method provides a more rigorous requirement for the reliability of the protection device itself, and the multi-interval protection depends on the reliability of the optical fiber ring network, and once the device or ring network fails, it can only be solved by means of the duplication of protection configuration, thereby increasing the cost of the secondary equipment. According to the embodiment of the invention, an optical fiber ring network of an intelligent on-site unit is cancelled, and the protection device of a single device is configured, so that the protection of each interval in various transformer substations and distribution substations can be realized, and the cost is reduced.
According to the scheme of the embodiment, the protection function of the intelligent on-site unit is configured in advance, different intervals can be protected in different modes, and the reliability of the intelligent on-site unit for interval protection is improved.
Application scenarios
In order to better understand the embodiment of the present invention, the application scenario takes a typical 110KV substation as an example, and the embodiment of the present invention is described in more detail. Fig. 5 is a wiring diagram of a110 KV substation, which mainly includes: the main transformer protection device 510, the 110KV incoming line 1 protection device 520, the 110KV incoming line 2 protection device 530, the 35KV line 1 protection device 540, the 35KV line 2 protection device 550, the 10KV line 1 protection device 560, and the 10KV line 2 protection device 570.
As can be seen from fig. 5, the 110KV substation includes 3 independent power supplies, which are two 110KV incoming line main power supplies and a 35KV line small power supply, and there are 9 intervals in total, each interval is equipped with a combination of a CTx (current transformer) and a CBx (circuit breaker) (x is 1 to 9), PT is a common bus Pty (y is 1 to 3), and the power supplies are respectively connected to 9 intelligent local units L U1 to L U9.
In a specific example of the embodiment of the present invention, in the substation as shown in fig. 5, where the digital protection device is used, a conventional digital protection device as shown in table 2 may be configured, and table 2 also lists the connection relationship between the protection device and the intelligent pair unit, where each protection device is configured as a single set.
TABLE 2 connection relationship table of protection device and intelligent on-site unit
| Power server protection device | Intelligent on-site unit |
| Main transformer protection device | LU2、LU3、LU4 |
| 110KV incoming line 1 protection device | LU1 |
| 110KV |
LU7 |
| 35KV line 1 protector | |
| 35KV line | |
| 2 protector | LU8 |
| 10KV line 1 protection device | |
| 10KV line | |
| 2 protection device | LU9 |
When L U1-L U9 and the protection devices connected with it communicate normally, L U1-L U9 executes the function of an intelligent unit, 8 protection devices in table 2 each perform its role, and have complete protection function for the faults (including main transformer interval, bus interval and line interval) of all the intervals of the 110KV transformer substation shown in fig. 5, and have selectivity, sensitivity, speed and reliability.
Illustratively, when a 35KV line 1 protection device has a fault, a GOOSE handshake signal to L U5 is stopped, L U5 starts to start an in-situ protection function, and other interval faults are still removed by other protection devices except the 35KV line 1 fault, if a line phase-to-phase fault occurs at the point F2, the fault is removed by L U5 phase-to-phase distance protection and a repressing direction overcurrent protection action tripping CB5, and if a single-phase grounding fault occurs at the point F2, a zero-sequence overcurrent protection action tripping CB5 is removed (for a 35KV neutral point non-effective grounding system, if the single-phase grounding zero-sequence current is small, the zero-sequence overcurrent protection can also be not operated).
Illustratively, if the main transformer protection device has a fault, the GOOSE handshake signals to L U2-L U4 are stopped, the three intelligent local units activate the local protection function, and faults of other intervals are still removed by other protection devices except the fault in the main transformer area, if the fault in the main transformer area occurs at the F1 point, because the power supplies provide short-circuit current in the interval where L U2 and L U3 are located, the distance protection of L U2 and L U3 or the over-current protection in the re-pressing direction is correctly operated, the CB2 and the CB3 are tripped, and because the short-circuit current does not flow in the interval where L U4 is located, although the local protection of L U4 cannot be operated, the CB4 keeps a closing state, but is an isolated passive network, no harm is caused.
In another specific example of the embodiment of the present invention, in a substation as shown in fig. 5, where a centralized protection device is used, the centralized protection device may be configured in two sets of duplexed ways, as shown in table 3, and all intelligent local units are respectively connected to two sets of centralized protection devices through two hundred megaoptical ports.
TABLE 3 connection relationship table of double-set configuration protection device and intelligent on-site unit
| Centralized protection device | Intelligent on-site unit |
| A set of centralized protection device | L U1-L U9 (Jingguang kou 111) |
| B set centralized protection device | L U1-L U9 (Jingguang kou 112) |
In the centralized protection device, the protection function modules corresponding to the 8 protection devices are also configured, and when the centralized protection device operates normally, the centralized protection device has the same protection function as that in the example, and the only difference is protection dualization configuration. When one protection device fails, the other protection device can still ensure the complete protection function of the whole station, and all the intelligent local units can still receive the GOOSE handshake signals of one optical port; when two protection devices simultaneously fail, all the intelligent on-site units start to start the on-site protection function, and after any interval fails, the protection action condition of the intelligent on-site units is the same as that in the above example.
Under the configuration mode, the number of the protection devices and the connection line between the intelligent on-site unit and the protection devices are further reduced, the cost is reduced, and meanwhile, the total-station protection performance is good.
EXAMPLE five
An embodiment of the present invention further provides a storage medium containing computer-executable instructions, which when executed by a computer processor, perform a method for in-place protection, the method comprising:
judging the state of a protection device connected with the intelligent on-site unit;
and when the communication of the protection device connected with the intelligent on-site unit is determined to be failed, enabling the on-site protection function of the intelligent on-site unit, and protecting the failure of the target interval in which the intelligent on-site unit is positioned through the on-site protection function. Of course, the storage medium provided by the embodiment of the present invention contains computer-executable instructions, and the computer-executable instructions are not limited to the method operations described above, and may also execute the relevant operations in the in-place protection method provided by any embodiment of the present invention.
Based on the understanding that the technical solutions of the present invention can be embodied in the form of software products, such as floppy disks, Read-Only memories (ROMs), Random Access Memories (RAMs), flash memories (F L ASHs), hard disks or optical disks of a computer, etc., and include instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods according to the embodiments of the present invention.
It should be noted that, in the above embodiment of the intelligent local unit, the units and modules included in the embodiment are only divided according to functional logic, but are not limited to the above division, as long as the corresponding functions can be implemented; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. An intelligent on-site unit with on-site protection, the core device comprising: the FPGA and the CPU; the FPGA is connected with the CPU through an embedded Ethernet;
the FPGA is used for sending an open protection function signal to the CPU through the embedded Ethernet when judging that the protection device connected with the intelligent local unit has a fault;
and the CPU is used for starting the local interval local protection function when receiving the open protection function signal, and providing a protection function for a target interval where the intelligent local unit is located through the local protection function.
2. The intelligent on-site unit of claim 1,
and the FPGA judges that the protection device connected with the intelligent on-site unit breaks down when the general object-oriented substation event GOOSE handshake signal sent by the protection device cannot be detected.
3. The intelligent on-site unit of claim 1 or 2,
the FPGA is also used for carrying out time synchronization on the intelligent on-site unit according to the time synchronization signal when the time synchronization signal is acquired through the time synchronization port; when the time setting signal can not be obtained through the time setting port, obtaining a GOOSE time scale from a GOOSE heartbeat message sent by the protection device, and sending the GOOSE time scale to the CPU;
and the CPU is also used for carrying out time synchronization on the intelligent on-site unit according to the GOOSE time scale.
4. The intelligent on-site unit of claim 1,
the CPU is specifically configured to, when a target interval fails, identify a failure direction and a section of the target interval by a distance protection element and/or a direction overcurrent protection element, and perform a corresponding protection action.
5. A method of in-situ protection, comprising:
judging the state of a protection device connected with the intelligent on-site unit;
when the protection device connected with the intelligent on-site unit is determined to be in failure, the on-site protection function of the intelligent on-site unit is started, and protection is provided for the target interval where the intelligent on-site unit is located through the on-site protection function.
6. The method of claim 5, further comprising:
and when the protection device connected with the intelligent on-site unit is determined to be normal, locking the on-site protection function of the intelligent on-site unit so that the protection device can provide protection for the target interval where the intelligent on-site unit is located.
7. The method of claim 5, wherein determining the status of a protection device associated with the intelligent on-site unit comprises:
judging whether the intelligent local unit can receive GOOSE handshake signals sent by the protection device;
and if not, determining that the protection device connected with the intelligent on-site unit has a fault.
8. The method of claim 5, further comprising:
if a time tick signal is acquired through a time tick port, carrying out time tick on the intelligent on-site unit according to the time tick signal;
and if the time setting signal can not be obtained through the time setting port, obtaining a GOOSE time scale from a GOOSE heartbeat message sent by the protection device, and setting time for the intelligent on-site unit according to the GOOSE time scale.
9. The method according to any of claims 5-8, wherein the in-place protection function protection provides protection against a fault in a target interval in which the intelligent in-place unit is located, comprising:
when the target interval has a fault, the fault direction and the section of the target interval are identified through a distance protection element and/or a direction overcurrent protection element, and corresponding protection actions are executed.
10. A storage medium containing computer-executable instructions for performing the in-place protection method of any of claims 5-9 when executed by a computer processor.
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| US20160141879A1 (en) * | 2014-11-16 | 2016-05-19 | Marvin Motsenbocker | DC Power Grid and Equipment |
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