CN115663750A - Intelligent relay protection system and method - Google Patents
Intelligent relay protection system and method Download PDFInfo
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Abstract
The invention relates to an intelligent relay protection system and a method, wherein the protection system comprises a plurality of relay protection units which are respectively arranged at different protection nodes of a power system, and each relay protection unit comprises a circuit breaker and a remote terminal unit which are connected with each other; the remote terminal units in the relay protection units are in wireless connection; the remote terminal unit is used for carrying out state monitoring, relay protection, information interaction and auxiliary relay protection; the protection system is provided with the remote terminal units for each circuit breaker, each remote terminal unit can communicate to complete timely and effective transmission of fault information, so that the whole protection system is an organic whole, each remote terminal unit can accurately determine the position and the property of a fault once the fault occurs, and whether the fault acts or not is determined according to the position and the property of the fault, thereby avoiding the technical defect that the misoperation is easily caused due to the hysteresis of an execution link in the process of independently carrying out relay protection on each electrical element.
Description
Technical Field
The invention relates to the technical field of relay protection, in particular to an intelligent relay protection system and method.
Background
The electric power system is an electric energy production and consumption system which consists of links such as a power plant, a power transmission and transformation line, a power supply and distribution station, power utilization and the like. The function of the device is to convert the primary energy of the nature into electric energy through a power generation device, and then supply the electric energy to each user through power transmission, power transformation and power distribution. In order to realize the function, the power system is also provided with corresponding information and control systems at each link and different levels, and the measurement, regulation, control, protection, communication and scheduling are carried out on the production, transmission and distribution processes of the electric energy so as to ensure that users obtain safe and high-quality electric energy.
The protection comprises relay protection, and the protection has the following functions: when the power system has a fault or an abnormal working condition, the fault equipment is automatically cut off from the system in the shortest possible time and in the smallest possible area, or a signal is sent out to eliminate the source of the abnormal working condition by an operator on duty so as to reduce or avoid the damage of the equipment and the influence on the power supply of the adjacent area. Relays with contacts have been used to protect power systems and their components (generators, transformers, transmission lines, etc.) from damage, and are therefore called "relay protection".
The equipment for realizing the relay protection function is called a relay protection device. Although there are many types of relay protection, the devices are different, but they all include the following main links: (1) signal collection, namely a measurement link; (2) analyzing and processing the signals; (3) judging a link; (4) and (5) an output link of the action signal. The above is limited to the problem of relaying protection of the elements making up the power system (generators, transformers, busbars, transmission lines, etc.), and the operating practice of power systems has proven that relaying protection devices for elements of the power system are most prone to problems, being configured to attempt to handle the faults when they occur, in the shortest time, in the smallest extent, and in the most correct manner.
The relay protection device of each element of the power system consists of three parts, namely a measuring element (corresponding to the (1) th link), a logic link (corresponding to the (2) th link and the (3) th link) and an execution output (namely the (4) th link). The measuring part compares the physical parameter of the protected electric element with a given value and gives a set of logic signals with the characteristics of yes and no according to the comparison result so as to judge whether the protection device should be started. The logic part then makes the protector judge the type and range of fault according to certain logic relation, and finally determines whether the relay should be tripped instantaneously or in delayed time or only sends out signal to the operator. And the execution output part finally completes the task born by the protection device according to the instruction transmitted by the logic part. Such as tripping when a fault occurs, signaling when the fault is not normal, and not operating when the fault is normal.
The relay protection device judges whether the power system has faults or not only by aiming at the change of the physical parameters of the electrical elements, once a certain electrical element of the power system has faults, the physical parameters of other electrical elements also change, when the physical parameters of the electrical element with the faults change, the physical parameters of other related electrical elements also change correspondingly, according to the current technical level, the measurement and logic links of the relay protection device hardly cause problems, and the electrical elements to be protected can be accurately judged. However, the performance of an execution device (i.e. a circuit breaker) of the relay protection device causes very short delay, or the execution link mostly consists of mechanical parts, and meanwhile, under the condition that the current power system is increasingly complex, the time difference of relay protection setting values is smaller and smaller, once the fault is serious and needs to be transient, the slight delay can cause other electrical elements to achieve the setting values because of physical parameters, thereby causing false operation, further enlarging the fault range, prolonging the time and being difficult to recover, and bringing huge hidden troubles to the stable operation of the power system.
Disclosure of Invention
The invention aims to provide an intelligent relay protection system and method to avoid the technical defect that misoperation is easily caused due to the lag of an execution link.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides an intelligent relay protection system, which comprises a plurality of relay protection units respectively arranged at different protection nodes of a power system, wherein each relay protection unit comprises a circuit breaker and a remote terminal unit which are connected with each other;
the remote terminal units in the relay protection units are in wireless connection;
the remote terminal unit is used for performing state monitoring, relay protection, information interaction and auxiliary relay protection;
the condition monitoring comprises: monitoring the state of a protected object, and judging whether the protected object fails or not; the protection object is an object protected by a protection node where the remote terminal unit is located;
the relay protection includes: when the protected object fails, controlling a circuit breaker of a fault node to carry out relay protection; the fault node is a protection node of a protection object which has a fault;
the information interaction comprises: when the protected object fails, generating fault information and sending the fault information to a remote terminal unit of a non-fault node; the non-failed node includes: other protection nodes in the power system other than the failed node;
the auxiliary relay protection includes: receiving fault information sent by a remote terminal unit of a fault node, and judging whether to carry out auxiliary relay protection according to the fault information; and if the auxiliary relay protection is judged to be carried out, waiting for preset time and controlling the circuit breaker of the non-fault node to carry out relay protection when the circuit breaker of the fault node does not act.
Optionally, the protection system further includes an upper computer, the upper computer is connected to each of the remote terminal units, the upper computer is configured to receive the fault information sent by the remote terminal unit, and display the fault information and the state of each circuit breaker, and the upper computer is further configured to send a remote control instruction to each of the remote terminal units.
Optionally, the upper computer is further configured to set parameters of each remote terminal unit, where the parameters at least include the preset time, the protected object, and the installation location.
Optionally, the fault information includes a fault location, a fault nature, and an execution condition.
Optionally, the preset time is greater than or equal to the pull-in release time of the circuit breaker.
Optionally, the determining whether to perform the auxiliary relay protection according to the fault information specifically includes:
determining whether the fault location is in the protection range of the non-fault node according to the fault location in the fault information;
and when the current node is within the protection range of the non-fault node, determining that the remote terminal unit of the non-fault node performs auxiliary relay protection.
An intelligent relay protection method is applied to the protection system and comprises the following steps:
monitoring the state of a protected object, and judging whether the protected object fails or not; the protection object is an object protected by a protection node where the remote terminal unit is located;
when the protected object has a fault, controlling a circuit breaker of a fault node to perform relay protection; the fault node is a protection node for protecting the object from faults;
when the protected object fails, generating fault information and sending the fault information to a remote terminal unit of a non-fault node; the non-fault node is other protection nodes except the fault node in the power system;
the remote terminal unit of the non-fault node receives fault information sent by the remote terminal unit of the fault node and judges whether to carry out auxiliary relay protection or not according to the fault information;
when the remote terminal unit of the non-fault node performs auxiliary relay protection, after waiting for the preset time, if the circuit breaker of the fault node still does not act, the circuit breaker of the non-fault node is controlled to perform relay protection.
Optionally, the determining, according to the fault information, whether to perform the auxiliary relay protection specifically includes:
determining whether the fault location is in the protection range of the non-fault node according to the fault location in the fault information;
and when the current node is within the protection range of the non-fault node, determining that the remote terminal unit of the non-fault node performs auxiliary relay protection.
Optionally, the preset time is greater than or equal to the pull-in release time of the circuit breaker.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention discloses an intelligent relay protection system and a method, wherein the protection system comprises a plurality of relay protection units which are respectively arranged at different protection nodes of a power system, and each relay protection unit comprises a circuit breaker and a remote terminal unit which are mutually connected; the remote terminal units in the relay protection units are wirelessly connected; the remote terminal unit is used for performing state monitoring, relay protection, information interaction and auxiliary relay protection; the protection system is provided with the remote terminal units for each circuit breaker, each remote terminal unit can communicate to complete timely and effective transmission of fault information, so that the whole protection system is an organic whole, each remote terminal unit can accurately determine the position and the property of a fault once the fault occurs, and whether the fault acts or not is determined according to the position and the property of the fault, thereby avoiding the technical defect that the misoperation is easily caused due to the hysteresis of an execution link in the process of independently carrying out relay protection on each electrical element.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a connection circuit diagram of a circuit breaker and a remote terminal unit in an intelligent relay protection system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a power supply system and a protection system provided therein according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide an intelligent relay protection system and method to avoid the technical defect that misoperation is easily caused due to the lag of an execution link.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Example 1
An embodiment 1 of the present invention provides an intelligent relay protection system, where a relay protection Unit in the system includes a Remote Terminal Unit (RTU) that is modified to have a relay protection function, an operation program, and an upper computer. The method comprises the following specific steps: a relay protection program is installed in a Remote Terminal Unit (RTU), so that the RTU has a selective relay protection function (motor protection, transformer protection and line protection), and a corresponding protection function can be selected according to protected equipment. That is, the RTU having the relay protection function after the transformation is set as a motor protection device, a transformer protection device or a line protection device as needed.
The RTU with the relay protection function after transformation enables the existing relay protection device to have the response type communication capacity, and the relay protection unit in the embodiment of the application is obtained. When the relay protection unit with the relay protection function RTU is installed, the installation position of the relay protection function RTU, the property of protected equipment, related protection programs and authorities are installed in a memory of the relay protection unit through an upper computer. Once the protected equipment has a fault, the RTU with the relay protection function does not only take charge of the protected equipment like the existing relay protection device, but immediately releases the nature and the position of the fault to the outside, and simultaneously enters a protection program to execute the relay protection function. The RTUs with relay protection function determine their operation sequence according to the preset program and authority through communication, and operate (execute the function of auxiliary relay protection) according to the set protection program. Unlike the existing relay protection device, the protection is only carried out according to the relay protection program of the relay protection device, and the trip condition is achieved and the trip is immediately carried out no matter what the reason is. This is very likely because the difference in protection is too small or there is a mechanical delay, and there may be some difference in relay protection device performance such that the device that should trip does not trip and the device that does not trip. The power supply system is subjected to misoperation, so that the fault range is enlarged, and the accident property becomes more complicated. Therefore, the power supply system is prevented from relay protection misoperation, and the safe operation of the power supply system is guaranteed. In the process of a power supply system fault, the upper computer acquires a fault location (related fault equipment), fault property and execution condition through fault information sent by the RTU with relay protection capability, and participates in the fault location, the fault property and the execution condition all the time, monitors the whole fault protection process, and can timely participate in remediation if an accident occurs. And by a man-machine exchange mode, the alarm is given at the first time to remind related personnel of paying attention.
The relay protection units in the protection system have the coordination capability, so that the power supply system can appoint related equipment to be operated to execute protection operation according to the equipment, the position and the property with faults according to the program, the false operation of relay protection devices at other parts can not occur, the accident range is prevented from being enlarged, and unnecessary loss is reduced.
The relay protection of the power supply system is flattened, the protection time limit is not limited any more, and once a fault occurs, each stage acts strictly according to the distributed time limit. Instead, in the protected power supply system, it is sufficient to reliably operate in accordance with the protection time limit allocated by the system, in the case where the safety of the protected power supply system is ensured within the protection time limit.
Considering that the existing relay protection devices do not have a mutual question-answering communication function, the relay protection device of the power system has a fault and can only carry out protection according to the corresponding protection program according to the acquired physical parameters of the electrical element, the relay protection devices of other related electrical elements also acquire the physical parameters of the electrical element and carry out protection according to the program, because the relay protection devices of all the electrical elements set relay protection fixed values according to the respective physical parameters, the existing power supply system is complex, the fixed value time difference is very small, and once the relay protection device of the electrical element with the fault lags due to various reasons, the relay protection devices of other related electrical elements are very likely to cause the action of the relay protection devices of other related electrical elements, namely the power system has a false operation.
The embodiment of the invention provides an intelligent relay protection system, which comprises a plurality of relay protection units respectively arranged at different protection nodes of a power system, wherein each relay protection unit comprises a circuit breaker and a remote terminal unit which are connected with each other; the remote terminal units in the relay protection units are in wireless connection; the remote terminal unit is used for performing state monitoring, relay protection, information interaction and auxiliary relay protection; the state monitoring comprises: monitoring the state of a protected object, and judging whether the protected object fails or not; the protection object is an object protected by a protection node where the remote terminal unit is located; the relay protection is realized by controlling a circuit breaker of a fault node to carry out relay protection when the protected object fails; the fault node is a protection node for protecting the object from faults; the information interaction comprises the steps of generating fault information when the protected object fails, and sending the fault information to a remote terminal unit of a non-fault node; the non-fault node is other protection nodes except the fault node in the power system; the information interaction also comprises receiving fault information sent by a remote terminal unit of a fault node, and judging whether to carry out auxiliary relay protection according to the fault information; and the auxiliary relay protection is that when the remote terminal unit of the non-fault node performs auxiliary relay protection, after waiting for preset time, if the circuit breaker of the fault node still does not act, the circuit breaker of the non-fault node is controlled to perform relay protection.
The connection mode between the remote terminal unit and the circuit breaker is shown in fig. 1, taking an ac contactor widely used by circuit breakers in an electric power system as an example: when an operating coil of the alternating current contactor is connected with working voltage, the operating coil attracts the contactor to be connected, and a circuit is conducted; when the working voltage is disconnected, the power-off contactor of the operating coil is switched off, and the line is disconnected. The RTU only needs to connect the ac 220V to the operating coil of the ac contactor by the output relay (the DOCOM and DO1 in fig. 1 are both ends of the switch of the output relay of the RTU, respectively).
In fact, the existing relay protection device, namely a circuit breaker, is not changed into an RTU, a relay protection unit combining the circuit breaker and the RTU is adopted in the intelligent relay protection system, and the relay protection unit is a device which is produced by utilizing the large memory space and the four-remote capacity of the RTU and is specially used for relay protection.
The relay protection unit has the function of correctly distinguishing whether a protected element is in a normal operation state or has a fault, and whether the protected element is in an internal fault or an external fault on the basis of the characteristic that electrical physical quantities change before and after a power system has a fault. Technically, the relay protection device meets all the relay protection functions of four basic requirements of selectivity, quick action, sensitivity and reliability. Meanwhile, the RTU communication distance is long, various communication ports are provided, and different communication requirements of dispersion and local are met; the CPU has strong computing power, provides large-capacity programs and data storage space, and is suitable for on-site operation and safe storage of a large amount of data; adapting to severe temperature and humidity environment, and the temperature of the working environment is-40 to +85 ℃ and the like.
The relay protection unit is simultaneously provided with relay protection software such as motor protection, transformer protection, line protection and the like, and specific equipment to be protected can be set according to an actual protection device. Of course, the motor protection device, the transformer protection device, and the line protection device may be designed and produced individually for the simplicity of the circuit of the relay protection unit of the present invention.
The input and output terminals of the relay protection unit are arranged according to actual requirements.
The embodiment of the invention modifies a Remote Terminal Unit (RTU), installs a relay protection program (executes the relay protection function), enables the modified RTU to have the relay protection function, and simultaneously downloads the programs of motor protection, transformer protection and line protection into the RTU by using the memory of the RTU, so that the modified RTU can be a motor relay protection unit, or a transformer relay protection unit, or a line relay protection unit according to instructions, and can select corresponding protection functions according to the protected equipment. Illustratively, the RTU is modified to function as follows:
the RTUs have communication capacity, communication can be established between the modified RTUs and an upper computer, and the upper computer sets protection authorities of the RTUs with relay protection functions according to a design program;
secondly, once an electric element (protected object) in the power system has a fault, the relay protection units of all related electric elements enter a protection program, but the tripping capacity of the relay protection units is controlled, when all the relay protection units accurately confirm the fault electric element and the position of the fault electric element through communication, the relay protection unit corresponding to the fault element analyzes through a set degree to further judge the fault type of the electric element, and corresponding actions of relay protection are carried out according to the type. In addition, each relay protection unit can realize communication through the host computer, namely, in the corresponding relay protection action process, the communication among the relay protection units can be carried out in real time, namely, in the action process of the specific relay protection unit, whether other relay protection units enter a protection program or not and meet corresponding action conditions or not are determined, and no matter whether the action conditions of the relay protection units are met or not, other relay protection actions are not allowed;
a relay protection unit such as this electric component (protection target) does not enter a protection program or has notified an actuator (breaker) to operate and does not operate. At the moment, the set other (generally, the previous stage) relay protection units execute relay protection actions to serve as relay protection remedy of the power supply system faults, and the safe and stable operation of the power supply system is ensured.
And thirdly, because the upper computer already knows the fault condition of the electrical element in the power system through the communication between the relay protection units, the upper computer supervises the execution of the relay protection of the power system. And if necessary, the relay protection is repaired according to a set program.
And fourthly, when the upper computer of the power system supervises relevant relay protection actions, informing operators on duty through a human-computer interface about fault locations (relevant fault equipment), fault properties and execution conditions so as to facilitate fault recovery.
Example 2
In the power supply system of a substation, there are equipment such as transformers, lines, motors, etc., as shown in fig. 2. The power supply system is divided into three levels of voltages of 10kV, 6kV and 400V, the time limit of the upper-level transformer substation distributed to a first-level transformer substation (a 10000/6000 transformer substation, namely a transformer substation for changing 10kV into 6 kV) is 0.5 second, namely the action time limit of a No. 1 breaker is 0.5 second; the primary substation is distributed to a secondary substation (a 6000/400 substation, namely a substation with the voltage of 6kV changed into 400V) to have the action time limit of 0.3 second, namely the action time limit of No. 2.1, 2.2, 2.3 and 2.4 circuit breakers is 0.3 second, and after the 4 circuit breakers (No. 2.1, 2.2, 2.3 and 2.4 circuit breakers) calculate that the breaking current reaches the action current, the circuit breakers are required to be tripped within 0.3 second, so that fault equipment is separated from a power supply system; the secondary substation is allocated to the circuit breakers of No. 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.1 and 4.2 with the action time limit of 0.1 second, and after the 11 circuit breakers calculate that the short-circuit current reaches the action current, the circuit breakers need to be tripped off within 0.1 second, so that the fault equipment is separated from the power supply system. The relay protection time limit of the power supply system is assumed for the sake of example and convenience of description.
A Remote Terminal Unit (RTU) is transformed, a relay protection program is installed, so that the RTU has a selective relay protection function (motor protection, transformer protection and line protection), and a corresponding relay protection function can be selected according to protected equipment, such as motor protection, transformer protection or line protection; the Remote Terminal Unit (RTU) provided with the relay protection program has a selective relay protection function, and simultaneously has a response type communication capability, so that the relay protection unit has the response type communication capability; each circuit breaker (1, 2.1, 2.2, 2.3, 2.4, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.1, 4.2) of the power supply system is provided with an RTU with relay protection function, which is changed into 1, 2.1, 2.2, 2.3, 2.4, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.1, 4.2 relay protection units (each relay protection unit comprises a circuit breaker and an RTU); and communication is established between each relay protection unit and the upper computer, and the position of each RTU, the calculation current, the protection authority and the like are set in the upper computer.
The method comprises the following specific steps:
when the power supply system is set, the positions (1, 2.1, 2.2, 2.3, 2.4, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.1 and 4.2) of the relay protection units are set in the relay protection units, and the mutual relation is determined. Such as: the protection devices No. 3.1, 3.2, 3.3, 3.4 are only related to the protection devices No. 2.1 and No. 1. The relay protection units 3.5, 3.6, 3.7, 3.8, 3.9, 4.1 and 4.2 are only related to the relay protection units 2.2 and 1. The relay protection units 2.1, 2.2, 2.3 and 2.4 are only related to the relay protection unit 1. Once the protected electric of the relay protection unit No. 3.3 has a fault, the relay protection units No. 3.1, 3.2, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.1, 4.2, 2.2, 2.3 and 2.4 exit the relay protection action immediately; only the relay protection units No. 2.1 and No. 1 enter a preparation state, when the maximum action time of the device is 0.39 second (the pull-in release time of the alternating current contactor is generally 0.30-0.38 second), the electrical fault protected by the relay protection unit No. 3.3 is not removed (the fault parameter is still in), the relay protection unit No. 2.1 immediately acts, and if the fault parameter is not disappeared within 0.39 second or the maximum protection time limit (set as 0.5 second here) of the system is still disappeared, the relay protection unit No. 1 immediately acts.
When the host computer executes the actions, the host computer is always in supervision execution and provides a fault alarm interface for explaining the fault position, the nature, the action process and the result. The personnel will be informed of the fault condition and purposefully perform the desired operation. Because the intelligent relay protection system participates, the faults of the power system can be well and orderly processed, and override tripping caused by misoperation can not occur.
Example 3
An embodiment 3 of the present invention provides an intelligent relay protection method, where the protection method is applied to the protection system described above, and the protection method includes the following steps:
monitoring the state of a protected object, and judging whether the protected object fails or not; the protection object is an object protected by a protection node where the remote terminal unit is located.
When the protected object fails, controlling a circuit breaker of a fault node to carry out relay protection; and the fault node is a protection node of the protection object which has a fault.
When the protected object fails, generating fault information and sending the fault information to a remote terminal unit of a non-fault node; the non-failure nodes are other protection nodes except the failure node in the power system.
And the remote terminal unit of the non-fault node receives fault information sent by the remote terminal unit of the fault node and judges whether to carry out auxiliary relay protection according to the fault information.
When the remote terminal unit of the non-fault node performs auxiliary relay protection, after waiting for preset time, if the circuit breaker of the fault node still does not act, the circuit breaker of the non-fault node is controlled to perform relay protection.
Wherein, judge whether to carry out auxiliary relay protection according to the fault information, specifically include:
and determining whether the fault location is in the protection range of the non-fault node according to the fault location in the fault information.
And when the current node is within the protection range of the non-fault node, determining that the remote terminal unit of the non-fault node performs auxiliary relay protection.
The preset time is more than or equal to the pull-in release time of the circuit breaker.
Compared with the prior art, the invention has the beneficial effects that: the relay protection unit of the power supply system can form an organic whole, the relay protection of the power supply system is flattened, and the importance of the relay protection action time limit in a controllable power supply system (such as a substation) is reduced. Therefore, when a certain part of the power supply system breaks down, override tripping of relevant relay protection units is avoided due to the setting of action time limit and sensitivity, the accident range is prevented from being enlarged, and unnecessary loss is reduced.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (9)
1. An intelligent relay protection system is characterized by comprising a plurality of relay protection units which are respectively arranged at different protection nodes of a power system;
each relay protection unit comprises a circuit breaker and a remote terminal unit which are connected with each other; the remote terminal units in the relay protection units are wirelessly connected;
the remote terminal unit is used for performing state monitoring, relay protection, information interaction and auxiliary relay protection; wherein,
the condition monitoring comprises: monitoring the state of a protected object, and judging whether the protected object fails or not; the protection object is an object protected by a protection node where the remote terminal unit is located;
the relay protection includes: when the protected object has a fault, controlling a circuit breaker of a fault node to perform relay protection; the fault node is a protection node for protecting the object from faults;
the information interaction comprises: when the protected object fails, generating fault information and sending the fault information to a remote terminal unit of a non-fault node; the non-failed node includes: other protection nodes in the power system other than the failed node;
the auxiliary relay protection includes: receiving fault information sent by a remote terminal unit of a fault node, and judging whether to carry out auxiliary relay protection according to the fault information; and if the auxiliary relay protection is judged to be carried out, waiting for preset time and controlling the circuit breaker of the non-fault node to carry out relay protection when the circuit breaker of the fault node does not act.
2. The intelligent relay protection system according to claim 1, wherein the protection system further comprises a host computer, the host computer is connected to each of the remote terminal units, the host computer is configured to receive fault information sent by the remote terminal units and display the fault information and a state of each circuit breaker, and the host computer is further configured to send a remote control command to each of the remote terminal units.
3. The intelligent relay protection system according to claim 2, wherein the host computer is further configured to set parameters of each of the remote terminal units, the parameters including at least the preset time, a protected object, and an installation location.
4. The intelligent relay protection system of claim 1, wherein the fault information includes fault location, fault nature, and implementation.
5. The intelligent relay protection system according to claim 1, wherein the preset time is greater than or equal to a pull-in release time of a circuit breaker.
6. The intelligent relay protection system according to claim 1, wherein the determining whether to perform the auxiliary relay protection according to the fault information specifically includes:
determining whether the fault location is in the protection range of the non-fault node according to the fault location in the fault information;
and when the current node is within the protection range of the non-fault node, determining that the remote terminal unit of the non-fault node performs auxiliary relay protection.
7. An intelligent relay protection method, which is applied to the protection system of any one of claims 1 to 6, and comprises the following steps:
monitoring the state of a protected object, and judging whether the protected object fails or not; the protection object is an object protected by a protection node where the remote terminal unit is located;
when the protected object has a fault, controlling a circuit breaker of a fault node to perform relay protection; the fault node is a protection node for protecting the object from faults;
when the protected object fails, generating fault information and sending the fault information to a remote terminal unit of a non-fault node; the non-failed node includes: other protection nodes in the power system other than the failed node;
the remote terminal unit of the non-fault node receives fault information sent by the remote terminal unit of the fault node and judges whether to carry out auxiliary relay protection or not according to the fault information;
when the remote terminal unit of the non-fault node performs auxiliary relay protection, after waiting for the preset time, if the circuit breaker of the fault node still does not act, the circuit breaker of the non-fault node is controlled to perform relay protection.
8. The intelligent relay protection method according to claim 7, wherein the determining whether to perform auxiliary relay protection according to the fault information specifically includes:
determining whether the fault location is in the protection range of the non-fault node according to the fault location in the fault information;
and when the current node is within the protection range of the non-fault node, determining that the remote terminal unit of the non-fault node performs auxiliary relay protection.
9. The intelligent relay protection method according to claim 7, wherein the preset time is greater than or equal to a pull-in release time of a circuit breaker.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101621217A (en) * | 2009-08-18 | 2010-01-06 | 北京四方继保自动化股份有限公司 | Protection system for area electric network data sharing |
| US20110310518A1 (en) * | 2010-06-16 | 2011-12-22 | Hitachi, Ltd | Multi-terminal power line protection relay system |
| CN104682359A (en) * | 2014-12-25 | 2015-06-03 | 国家电网公司 | Relay protection method of power supply line |
| CN104753038A (en) * | 2015-03-27 | 2015-07-01 | 广州至德电力科技有限公司 | Intelligent substation centralized relay protection system and method |
| CN106058831A (en) * | 2016-08-05 | 2016-10-26 | 江苏方天电力技术有限公司 | Intelligent distributed rapid protection and fault isolation method of self-adaptive power distribution network |
-
2022
- 2022-11-04 CN CN202211374200.4A patent/CN115663750A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101621217A (en) * | 2009-08-18 | 2010-01-06 | 北京四方继保自动化股份有限公司 | Protection system for area electric network data sharing |
| US20110310518A1 (en) * | 2010-06-16 | 2011-12-22 | Hitachi, Ltd | Multi-terminal power line protection relay system |
| CN104682359A (en) * | 2014-12-25 | 2015-06-03 | 国家电网公司 | Relay protection method of power supply line |
| CN104753038A (en) * | 2015-03-27 | 2015-07-01 | 广州至德电力科技有限公司 | Intelligent substation centralized relay protection system and method |
| CN106058831A (en) * | 2016-08-05 | 2016-10-26 | 江苏方天电力技术有限公司 | Intelligent distributed rapid protection and fault isolation method of self-adaptive power distribution network |
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