JPH0552126B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a ring line system protection device.

[Conventional technology]

Figure 5 is a system diagram showing a conventional example of the ring system protection system. In Figure 5, PO is the power supply, RY ₁ , RY ₂
is a short-circuit and ground-fault differential relay installed at consumers LO ₁ to _{LO 4} , RY ₀ is a short-circuit and ground-fault differential relay installed at the substation, and RY ₃ is installed at the substation. Undervoltage and ground fault overvoltage relays, CT is a current transformer that obtains current information, BUS ₁ to _{BUS 4} are customer bus Tr, PT
is a transformer, CB ₀ , CB ₁ , CB ₂ are wires and circuit breakers.
The circuit is set so that when the relay RY ₁ operates, the circuit breaker CB ₂ is tripped, and when the relay RY ₂ operates, the circuit breaker CB ₁ is tripped.

[Problem that the invention seeks to solve]

The protection device shown in Figure 5 cross-connects current transformers CT,
From the current information obtained from the current transformer CT, the relay RY ₁ ,
The purpose is to operate RY ₂ to protect against track accidents, customer busbar accidents, etc. However, the conventional device shown in FIG. 5 has a problem in that since the relay is used at each customer, maintenance and inspection of the relay is required, and it is necessary to go to each customer to perform the maintenance and inspection.

This invention was made in view of the above circumstances, and it is possible to detect failures, accidents, etc. from the current information of each bus bar and trip a predetermined switch or disconnection without installing a protective relay at the customer. It is an object of the present invention to provide a ring system protection device that is capable of determining failures of information transmission lines and the like.

[Means and actions for solving problems]

This invention uses optical transmission lines to transmit various information between a master station equipped with a central processing unit and a plurality of slave stations, and a pair of transmission lines is provided, and the same information is transmitted through the pair of transmission lines in opposite directions. The main station transmits the information to the master station, and the master station determines whether there is an abnormality in the transmission line, slave station, etc., and performs protection processing.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

In Figure 1, MAS is a master station installed on the substation side, and this master station MAS includes a central processing unit CPU that performs protection processing, and a transmission interface that sends and receives data (information) that is transmitted clockwise in the figure. It is composed of a interface R and a transmission interface L that transmits and receives data in a counterclockwise direction as shown in the figure.
The central processing unit CPU receives current information i ₁ , i ₁₀ from the current transformer CT and voltage information v from the transformer PT as shown in Fig. 5.
is input. SUB ₁ to _{SUB 4} are each customer's LO ₁ to
These slave stations SUB ₁ to SUB ₄ are installed in LO ₄ (shown in Figure 5), and these slave stations SUB 1 to SUB 4 are central processing units CPUs into which current information i ₁ to i ₉ of each customer LO ₁ to _{LO 4} is input. ₁ ～
It is composed of CPU ₄ , transmission interfaces _R1 to _R4 that transmit and receive data that is transmitted in a clockwise direction as shown, and transmission interfaces _L1 to _L4 that transmit and receive data that is transmitted in a counterclockwise direction as shown in the figure. . In particular, the central processing units CPU ₁ to CPU ₄ of the slave stations SUB ₁ to SUB ₄ have the function of A/D converting (analog-to-digital conversion) the input current information i ₁ to i ₉ and transfer data from the master station MAS. It has functions such as receiving and tripping disconnectors CB ₁ and CB ₂ . DR ₁ to _{DR 5} and
DL ₁ to _{DL 5} are optical transmission lines made of optical fiber cables, and these optical transmission lines DR ₁ to DR 5 and _{DL 1 to DL 5}
are each transmission interface R, R ₁ ~ R ₄ , L ₁ ~
The data for transfer is connected to these _optical transmission lines.
It is transmitted to DR ₁ to DR ₅ and DL ₁ to _{DL 5} .

Next, the operation of the above embodiment will be described. When transmission interface R ₁ of slave station SUB ₁ receives a transfer signal (downlink signal) from master station MAS, it transmits the signal to slave station SUB _1.
The current information i ₂ input to the central processing unit CPU ₁ of
i ₃ and interface R ₁ to optical transmission line DR ₂
The signal is transmitted from the transmitter. The signal transmitted to optical transmission line DR ₂ is sent to the transmission interface of slave station SUB ₂ .
It is input to _R2 , and the current information _i4 and _i5 are superimposed and transmitted to the optical transmission line _DR3 in the same manner as described above. Thereafter, the current information up to the slave station SUB ₄ is similarly supplied to the transmission interface R of the master station MAS via the optical transmission line DR ₅ . Through this interface R, the total current information is distributed into information corresponding to each customer and stored in the central processing unit CPU of the master station MAS. Note that the counterclockwise rotation is also processed in the same way. here,
The reason why the data is clockwise and counterclockwise is to enable protection even in the event of a break in the optical transmission line or the creation of a new customer. Next, in the configuration of the above embodiment, the interfaces R ₁ to R ₄ , L ₁ to L ₄ of the slave stations SUB ₁ to SUB ₄ , and the central processing unit
The protection process becomes impossible when there is an abnormality in the CPU ₁ to _{CPU 4} , an abnormality in the power supply of the customer, or a disconnection in the optical transmission lines DR ₁ to _{DR 5} and DL ₁ to _{DL 4} . Therefore, when each customer's power supply is abnormal, the central processing unit CPU ₁ ~
When CPU ₄ is abnormal, current information and transfer signals cannot be exchanged with master station MAS. Such a situation can be dealt with by a wide-area differential as shown in FIG. In FIG. 2, for example, when slave station SUB ₁ enters the abnormal state as described above, the data of current information i ₂ and i ₃ is not transmitted to master station MAS. Therefore, wide-area differential (using relay 87B) using current information i ₁ and i ₅ is used. When relay 87B operates, the circuit breaker CB ₀ and the customer
Take action by tripping LO ₂ 's disconnector CB ₁ . Figure 2 shows the case of wide-area differential, and the above-mentioned disconnection of the optical transmission lines DR ₁ to DR ₅ and DL ₁ to _{DL 5} ,
Customer power supply abnormality, transmission interface R ₁
~ R ₄ , L ₁ ~ L ₄ abnormality or central processing unit CPU ₁ ~ _{CPU 4}
The third section describes what happens to the uplink signal (or downlink signal) transmitted to the master station MAS in the event of an abnormality.
Shown in the table of figures. In Figure 3, R-system data refers to clockwise transmission, L-system data refers to counterclockwise transmission, uplink refers to data transmitted from a slave station to a master station, and downlink refers to data transmitted from a master station to a slave station. It is. Also the third
In the figure, a circle mark indicates that data reception is possible, and a cross mark indicates that data reception is impossible.

As is clear from Figure 3, when the optical transmission line is disconnected or the transmission interface is abnormal, the current information from each customer is normally transmitted to the master station MAS by either the clockwise or counterclockwise system, so protection processing is performed. can be done without any problem. It should be noted that if both clockwise and counterclockwise information is normal, it is used with priority.

In the case of an abnormality as described above, protection processing can be performed without any problem, but when the power of each customer is cut off and CPU ₁ to _{CPU 4} are abnormal, the current information of the abnormal customer will not be transmitted and will not be transmitted. I can't even receive a trip signal. In such a case, a wide area differential as shown in FIG. 2 may be used. Note that it is absolutely necessary to make each of the above-mentioned failure parts clear in order to avoid maintenance through automatic monitoring. FIG. 4 is a flowchart for detecting the failure part, and is a flowchart for a case where N customers are configured in a loop. In Figure 4, R
(K) is R-system uplink data of slave station K, and when it is "1" it is receivable, and when it is "0" it is not receivable. Also, L
(K) is L-system uplink data of slave station K, which is receivable when it is "1" and cannot be received when it is "0". R(K)・
R(I) indicates logical product, and R(K)+R(I) indicates logical sum.

〔Effect of the invention〕

As described above, according to the present invention, various types of information are transmitted between a master station equipped with a central processing unit and a plurality of slave stations through an optical transmission line, and a pair of transmission lines is provided, and a pair of transmission lines is provided. Since the same information is transmitted to the master station in opposite directions, it is possible to ensure protection without installing a relay at the customer, and to prevent disconnections in the optical transmission line and damage to the slave stations. There is an advantage that even in the event of a failure, the master station can determine the failure.

[Brief explanation of the drawing]

FIG. 1 is a configuration explanatory diagram showing an embodiment of the present invention, FIG. 2 is a system diagram for explaining wide area differential,
Figure 3 is an explanatory diagram showing in a table whether it is possible or impossible to receive clockwise and counterclockwise signals in an abnormality, Figure 4 is a flowchart for detecting a faulty part, and Figure 5 is a conventional example. FIG. MAS...Master station, SUB ₁ to SUB ₄ ...Slave station,
DR ₁ to DR ₅ and DL ₁ to DL ₅ ...Optical transmission line, R,
L...Transmission interface.

Claims (1)

[Scope of Claims] 1. A master station with a central processing unit is installed on the substation side of the ring system, and this master station receives current information of each customer from a slave station with a central processing unit, and transmits the information to the central A processing device makes a judgment, and based on the judgment result, information that causes each customer's power switch to be tripped is transmitted to each slave station, and a pair of optical transmission lines for uplink and downlink are provided between the master station and multiple slave stations. , in a ring system protection device that transmits the same information to the master station in opposite directions through the pair of transmission paths, when the slave station in the upstream loop (or downstream loop) is unable to receive data and the downstream loop is interrupted. (or in the up loop), and this determining unit determines whether or not the slave station has become the master under the condition that reception is possible, and the master state A ring line system protection device characterized in that the master station is provided with an accident determination means that determines that the transmission line is broken when the transmission line is disconnected, and that the transmission interface is abnormal when it is not in the master state.