JPH0691708B2 - Accident facility determination method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a system for automatically determining a power system accident facility by a computer for controlling a power system, and a state change of a break, a breaker, or a protection relay that occurs in a jurisdiction system. The method relates to a method of accumulating a certain period of time for a certain period of time and confirming the faulty facility for a facility group that has lost power due to an accident.

[Conventional technology]

Conventionally, the judgment method of accident equipment in a power system accident determines the editing range of the protection relay operated by the information of tripping and disconnection, and determines the accident equipment by the operating direction of the protection relay for that range, It was a method with two directions when judging suspicious equipment as accident candidate equipment. Related to this method, Keizo Nakayama "Protective Relay System" (published by Densho Shoin in 1974)
The description in Chapter 1 is given.

[Problems to be solved by the invention]

In the conventional method, if the main protection relay operates, the protection equipment can be determined, so the accident equipment can be determined. However, when the main protection is malfunctioning, the backup protection relay operates and protects the equipment, but it is impossible to determine the accident equipment from that information.
It was difficult due to the characteristics of the backup protection relay. In addition, the range of a certain facility is determined, and if there is an accident facility in it, all the facilities within that range are judged as accident candidate facilities, which is not necessarily efficient. It was That is, when only the backup protection relay operates, the edit range of relay information is determined from tripping and disconnection, and the backup protection relay that has the operation direction limits the accident equipment range from that direction and does not have the operation direction. Used all the equipment within the editing range as accident candidate equipment. Therefore, there is a problem that the accident equipment cannot be determined when the main protection relay is not operating.

An object of the present invention is to solve the problems of the above-mentioned conventional method, and to use the information of tripping and disconnection and the operation information of the bus bar no-voltage detection relay as the information for determining the accident facility, thereby reducing the conventional efficiency. It is to provide a method for improving the reliability of the accident and determining with high reliability the accident equipment within the jurisdiction system that serves as the basis for the judgment of the accident recovery operation.

[Means for solving problems]

The purpose of the above is to apply the conventional method and determine the range of the suspicious accident equipment, and then determine the accident based on the information of tripping and disconnection, the operation information of the bus bar no-voltage detection relay and the operation information of the operated protection relay. Focusing on the bus in the candidate equipment, AND information is used for the operation information of the bus non-voltage relay, the operation information of the backup protection relay that has operated, and the trip information of the connection and disconnection of the transmission line and the bus. If it holds,
It is determined that the transmission line to which the tripped shisha or disconnector belongs is the accident equipment, and the busbar is sound, and the trip information of the shisha or disconnector that connects the busbar and the transformer is added to the above three information. By using two items of information as an AND condition, if this AND condition is satisfied, it is achieved by determining that the bus is an accident facility and the transmission line is sound.

[Action]

There are two types of backup protection relays, one with protection direction characteristics and one without protection direction characteristics.

Since the direction of protection is determined by the operation of the relay having the protection direction characteristic, a certain range is narrowed down. By combining trip information on the results and breaks, the role of protecting the equipment of the protection relay and the positioning as a backup for the main protection open the breaks and breaks in the vicinity of the accident equipment.

Further, since an accident occurs in one equipment, it is possible to determine the accident equipment by combining the protection relay operation information with the trip or disconnection information.

Even in the case of a relay that does not have a protection direction, the target range is wider than that of a relay that has a protection direction, but considering that an accident occurs in one facility, information on tripping and disconnection is displayed. By combining them, it is possible to determine the accident equipment as well.

In addition, it can be said that the power system is roughly composed of a transmission line and a transformer centered on a bus. When an accident occurs in the power system, if it is a bus line accident, the bus will be disconnected from the system by a protection relay and a power outage will occur. Therefore, it is possible to know that the bus bar no-voltage detection relay has operated and the bus bar has lost power.

By combining the above features, it is possible to determine the faulty equipment based on the AND condition described above.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a block diagram showing the system configuration of the present invention. Reference numeral 1 is a jurisdiction system, 2 is an online information input device, 3 is an electronic computer, 4 is a current system state storage unit, 5 is a system state storage unit immediately after an accident, 6 is an accident equipment determination processing unit, and 7 is a display unit.

The online information input device 2 stores the state information of the switches of the jurisdiction system 1 and the operation information of the protection relay in the current system storage unit 4 in the electronic computer 3 at a constant cycle. When an accident occurs in the jurisdiction system 1 and the protection relay operates, the contents of the current system state storage unit 4 are transferred to the system state storage unit 5 immediately after the accident and stored in the state storage unit 5 immediately after the accident. With respect to the power system, the accident equipment determination processing unit 6 using the method of the present invention determines the accident equipment, and the display unit 7 notifies the operator of the result.

FIG. 2 shows the processing sequence of the method of the present invention by the processing steps S1 to S5. The individual processes will be described below. First, the step S1 accumulates a change in the status of a certain time (for example, 10 seconds) from the jurisdiction system that occurs at the time of an accident, that is, a change in the operation information of the protection relay and the breaker non-voltage detection relay.

Next, in step S2, a power failure equipment group is created by the following two procedures.

First, the unit equipment (bus, transmission line, power line, etc.) that constitutes an electric power system that is electrically connected via a "closed" switch is used by using the accumulated operation information of trips and disconnectors. Reorganize the equipment group, which is a collection of transformers. Next, the operation information of the no-voltage detection relay in the accumulated state is used to determine the equipment group in the power failure state, and the equipment group is set as the power failure equipment group.

Next, in step S3, the power failure equipment groups created above are combined with each other through a switch that trips to combine adjacent power failure equipment groups into one power failure equipment group group. In addition, the other power outage facility groups are grouped together to form a power outage facility group group. FIG. 3 is an example showing a relationship between a power outage facility group and a power outage facility group. (1) ~ in the figure
(10) is a branch number given to each unit equipment of a transmission line and a transformer, is a node number given to each unit equipment of a bus, and G1 and G2 are external power supplies.

Assuming that the switches at both ends of the branch trip due to the accidents of the branches (1) and (2) (corresponding to the transmission line route accident) as shown in Fig. 3, the equipment in the diagram excludes the nodes. Becomes In this embodiment, the power outage facility group is four groups as shown in Table 1 (a) below, and the power outage facility group group is two groups as shown in Table 1 (b) below. By thus connecting the power failure equipment groups by the trip switch information, the accident equipment determination processing described below can be facilitated and the processing time can be shortened.

Next, in step S4, the operation information of the protection relay is extracted from the accumulated state changes and edited for each power outage group group. That is, first, by classifying the operation information of the protection relay into the operation information of the main protection relay and the backup protection relay, then by comparing the operation location on the power system of the protection relay and the power failure equipment group group, Edit the operation information of the protection relay for each power outage group group. Of the protection relay operation information on the boundary of the power failure equipment group group, the operation information of the main protection relay is edited on the power failure equipment group group side to which the protection equipment of the protection relay belongs, and the operation information of the backup equipment protection relay is Edit it on the side of the power failure equipment group to which the switch tripped by the protection relay operation belongs.

In addition, backup protection relays are classified into those with protection direction characteristics and those without protection direction characteristics, depending on the characteristics of the relay. In other words, the distance relays (DZ ₂ , DZ ₃ ) etc. for the second and subsequent stages for the protection of back-up equipment include not only the unit equipment but also a plurality of equipment connected to the unit equipment, and have a protection direction characteristic. To call. On the other hand, a protection relay such as an overcurrent relay (OC) that operates as a logical sum of a plurality of unit equipments is referred to as having no protection direction characteristic.

Table 2 below shows an example of the classification of the main protection relay and the backup protection relay.

Lastly, the accident equipment and the accident candidate equipment are determined by using the operation information of the protection relay edited for each power outage equipment group group in step S5.

Next, details of the accident facility determination process will be described.

As a result of extracting the operation mode of the protection relay on the boundary of the power outage equipment group group and the operation mode of the protection relay as the determination method when various accidents occur in the power system, the operation information of the protection relay is shown in relation to the accident equipment determination processing. Shown in.

The main protection relay (hereinafter abbreviated as M.Ry) covers one facility and the backup protection relay (hereinafter abbreviated as B.Ry) covers two or more facilities. For example, a so-called second stage of a distance relay used as a protection relay for a power transmission line not only sets the transmission line in which the protection relay is installed as a protection range, but also the electric power of the other end of the transmission line. Station (departure substation)
The protection range is up to about half the total length of the other transmission lines connected to.

In the “conceptual diagram” in FIG. 4, 101 represents a power failure same-voltage equipment group, 102 represents an accidental equipment, and 103 represents an estimated accidental equipment. Also, 111 is the main protection relay operation skipping breaker trip information, 112 is the backup protection relay (with direction characteristic) operation skipping and disconnection trip information, 113 is the backup protection relay (without direction characteristic) operation skipping and disconnection. Indicates instrument trip information.

The accident facility determination method shown in FIG. 4 will be described below.

(1) When there is M.Ry operation When there is M.Ry operation within the power outage facility group, the M.Ry
Equipment within the scope of protection is judged to be accident equipment. Also, if there is B.Ry operation in addition to M.Ry operation, B.Ry operation is ignored and
Equipment within the protection range of M.Ry is judged as accident equipment.

(2) For B.Ry operation only When the operation relay in the power failure equipment group group is B.Ry only, B.Ry operation with protection direction characteristic and no protection direction characteristic
B. Ry operation and protection direction characteristics mixed.
Classified as Ry operation.

First, in the case of B.Ry operation with the protection direction characteristic, it operated
It is judged as follows depending on whether or not all of B.Ry face the inside of the power outage equipment group. That is, B.
If all of Ry faces the inside of the group group, all the equipment in the group group are assumed to be accidental equipment. Meanwhile, it worked
If even one of B.Ry faces the outside of the group, it is determined that there is no accident equipment or estimated accident equipment in the group.

Next, in the case of B.Ry operation without protection direction characteristics, all equipment in the group group is assumed to be accident equipment. When B.Ry operations with and without protection direction characteristics coexist, the above protection direction characteristics exist depending on whether all B.Ry with protection direction characteristics face the inside of the power failure equipment group group. B.
The same judgment as in Ry operation is performed.

In other words, regardless of the protection characteristics of the backup protection relay, for all the busbars in the group where the bus voltageless detection relay is operating, the equipment connected to the busbar before the accident (transmission) (Electric wires, transformers), the operation information (relay on or off) of the backup protection relay is present on the relevant busbar side of all the extracted equipment, and the busbar and the extracted equipment are connected. It is determined whether or not there is the trip information (whether or not the breaker is off). As a result, if all the information is satisfied as the AND condition, the bus is determined to be the accident facility. Also, if the AND condition is not satisfied, that is, if there is no trip and there is a breaker, the busbar is judged to be sound and the equipment side (transmission line) to which the tripped or breaker belongs Is judged as accident equipment. The condition of the transformer is insufficient, so it is judged as an accident candidate facility.

As described above, the conceptual diagrams (B), (D), (E) of FIG.
In this case, the operation information of the bus non-voltage detection relay, the operation information of the backup protection relay, and the trip information on the connection and disconnection of the bus and the transmission line are used as the AND condition. If this condition is met, the transmission line is Is judged to be the accident equipment, and the relevant bus bar is judged to be sound. Furthermore, the trip information on the connection between the bus and the transformer and the disconnection trip information is added to the element of the AND condition above.If this condition is satisfied, the bus is judged to be an accident facility and the transmission line and transformer are sound. Judge that there is.

FIG. 5 shows an example of a bus accident. In the figure, (1) to (5) are branch numbers given to each unit equipment of transmission lines and transformers, ... are node numbers given to each unit equipment of busbars, and G1 and G2 are external power sources. is there. Before the accident, the circuit breaker connecting the transmission line (3) and the bus bar was open, and there were two equipment groups.
The busbar is powered by G2.

Now, if an accident occurs on the bus, the following phenomena occur. The protection relay detects that an accident has occurred on the busbar (second information), and the breaker B1 connecting the transmission line (4) and the busbar and the breaker connecting the busbar and the transformer (5). Open B2. That is, B1 and B2 are tripped. And the trip information (third information) of B1 and B2
The trip information (4th information) is detected. As a result, there is no change in the equipment group that is supplied with power from G1, but in the equipment group of G2, the breakers B1 and B2 are used as the boundary.
It is divided into three groups: a group consisting of G2, ..., (2) and (4) and a group of (5).
Here, the latter two groups had been powered from G2 via breaker B1 before the accident, but became a power failure state due to a trip of B1. This power failure state is detected by the operation of the bus or the no-voltage detection relay (1st
Information). The part surrounded by the diagonal lines in the figure is a power failure, and there are two power failure equipment groups, R1 and R2. Here, the power outage facility group group is one of {R1, R2}, and {} represents a set of power outage facility groups, that is, a power outage facility group group. If the main protection relay of the node that assumed the accident did not work and the backup protection relay did work, the power failure equipment group R1
Operating on the boundary of the power outage facility group {R1, R2}
The backup protection relays B1 and B2 are edited and the edited information is used to judge the accident equipment by the method shown in FIG.

The determination of the accident equipment based on the above-mentioned first information to fourth information will be described in more detail. Using the trip information of the circuit breakers B1 and B2, the equipment group that is electrically connected is determined. At this time, on the computer, B1, B2 that tripped
Before the accident, it was known that they belonged to the group that received power from G2, so it is only necessary to reorganize the equipment groups for the equipment groups that receive power from G2, so processing is fast.

Next, the charging power failure is determined for the newly divided three equipment groups by checking the presence / absence of a power source for each group. Further, among the power outage equipment groups determined to have a power outage, the groups adjacent to each other by the trip breaker before the accident are combined into one power outage equipment group. Since the accident equipment exists in the equipment group that has been out of power due to an accident, the logical product (AND) of the above first to third information or the above first to fourth information is established by limiting the range to this power outage group. Or not. In this embodiment, when an accident occurs in the bus bar, the bus which is the accident equipment is disconnected. This is based on the operation of the normal protection relay (second information). As a result, the trip of B1 (third information), the trip of B2 connecting the bus and the transformer (5) (fourth information), and the operation information of the no-voltage detection relay of the bus (first information) are detected. Then, the AND of the first to fourth information is established, and the bus of the group is determined to be the accident equipment.

If the transmission line (4) had an accident, B1 which disconnects the transmission line (4) from normal protection relay operation will be tripped, but B2 will not be tripped. As a result, the fourth information does not exist, it becomes an AND of the first to third information, and it is determined that the transmission line (4) of the group to which the trip breaker B1 belongs belongs to an accident.

As a result, it is judged to be any one of the conceptual diagrams (B), (D), and (E) of FIG. 4 (any one of (B), (D), and (E) is determined by the type of the backup protection relay that has operated). .). After that, the busbar and the transmission line (4) are connected or disconnected, and the busbar and the transformer (5) are connected, or the trip information of the disconnector and the busbar no-voltage notifying that the busbar has failed. Since the operation information of the detection relay is satisfied as an AND condition, the bus can be judged as an accident equipment instead of the accident candidate equipment.

In this example, only the case where the bus bar is the accident equipment is described, but an accident occurs on the transmission line (5), and the backup protection relay B1
Also, when the busbar and the transmission line (5) are connected, or when the trip information of the disconnector and the busbar no-voltage detection relay information of the busbar are used, it is possible to make a determination by checking the AND condition as described above. .

〔The invention's effect〕

As described above, the present invention further advances the accident facility determination method shown in FIG. 4 to obtain a conceptual diagram (B) of FIG.
In each of the cases (D) and (E), what is determined to be an accident candidate equipment is connected to the busbar non-voltage detection relay operation information and the equipment and the busbar that were connected to the busbar before the accident occurred. By configuring the AND condition with trip information on the breaker and breaker and operation information on the backup protection relay, it is possible to clearly judge that the equipment is an accident, not a candidate equipment.
It is possible to further improve the reliability of the accident equipment determination.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of an embodiment of the present invention, FIG. 2 is a flowchart diagram showing the principle of the present invention, and FIG. 3 is one of the features of the present invention, a power outage facility group and a power outage facility group. FIG. 4 is a diagram showing an example of a relationship with a group, FIG. 4 is a diagram showing a basic idea of an accident facility determination method, and FIG. 5 is a diagram showing an application example of the present invention. 1 ... Jurisdiction system, 2 ... Online information input device, 3 ... Computer, 7 ... Display unit.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Moriyoshi Nagahama 1-3-3 Uchisaiwaicho, Chiyoda-ku, Tokyo Within Tokyo Electric Power Co., Inc. (72) Shigeo Takayanagi 1st Toshiba-cho, Fuchu-shi, Tokyo Toshiba Corporation Fuchu Factory (72) Inventor Mamoru 52-1 Omika-cho, Hitachi City, Ibaraki Prefecture Hitachi Ltd. Omika Factory, Ltd. (72) Inventor Mitsuru Fukaya 1-1-1 Wadazaki-cho, Hyogo-ku, Kobe City, Hyogo Prefecture No. 2 Mitsubishi Electric Co., Ltd. (56) References JP-A-57-71215 (JP, A) JP-A-57-71225 (JP, A)

Claims (1)

[Claims] 1. A power facility group electrically connected to each other is created by using state information of switches of a power system, a charging / discharging is determined for each of the facility groups, and a facility group having a power failure is An accident equipment determination method for determining an accident equipment on the basis of operation information of an activated protection relay and trip switch information, which is first information indicating an operation state of a bus bar no-voltage detection relay, protection of a bus line or a transmission line. When the second information indicating the relay operating state and the third information indicating the connection between the transmission line and the bus bar and the disconnecting trip condition are satisfied under the AND condition, the tripping or disconnecting device is installed. It is determined that the electric wire is the accident equipment and the bus is healthy equipment, and in addition to the above information, when the fourth information indicating the trip condition of the transformer and the bus is connected under the AND condition, the corresponding bus is The accident equipment, Fault facility determination method characterized by determining the transmission lines to which the Toritsupu to and disconnection device is installed is sound equipment.