JPH0572171B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a ring line system protection device that takes measures against disconnection failure.

B. Summary of the Invention This invention provides a ring line system protection device that inputs current information of each consumer to a central processing unit installed in a substation via a slave station device installed in the customer, The central processing unit has means for providing centralized protection for the substations, directly tripping the breakers in the substation, and tripping the breakers in the slave stations from the central processing unit via the slave stations. Since the transfer trip command continues even after the disconnection time of the station equipment has elapsed, the function to detect the disconnection failure mentioned above and the function to detect the disconnection failure, By having a function that forcibly sets the current information of the slave station device that has become inoperable to zero and performs relay processing, the entire power outage range can be extended to a single customer with an inoperable disconnector. It is characterized by being limited.

C. Conventional technology FIG. 2 shows a schematic configuration of this type of conventional device.

In the same figure, PO is the power supply, RY1 to RY10 and RY31 are relays, BUS ₁ to _{BUS 4} are bus bars, and L ₁
~L ₄ is the consumer, CT is the current transformer, Tr is the transformer, PW ₁
~PW ₅ is the pilot wire cable.
The protective devices shown in Figure 2 include relays RY2~
Since RY9 is set as a slave station, maintenance work is troublesome, and since the current transformer, line, and bus are cross-connected, there is a risk of track accidents, customer bus failures, and customer transformer failures. Identifying secondary side failure is
This was difficult due to the length of the line, the capacity of the consumer transformer, and the short-circuit capacity of the power supply.

Figure 3 shows the trip sequence of the method shown in Figure 2, in which P and N are the positive and negative power supply lines, 27 is the normally open contact of the undervoltage relay, and 17S is the normally open contact of the short-circuit differential relay. , both contacts are connected in series with the trip coil TC and connected between the above P and N. Further, the series circuit of the normally open contact of the ground fault overvoltage relay 64 and the normally open contact of the ground fault differential relay 17G is connected in parallel to the series circuit of the contacts 27 and 17S. This trip sequence is performed in the same way for substations, disconnectors, slave stations, and disconnectors. In order to solve the above problems of the device shown in Figure 2, slave station current transformer information is transmitted to the substation, and relay processing for classifying line protection and bus bar protection is performed at the substation all at once. A method was devised.

FIG. 4 is a block diagram of the above proposal. The same parts as in FIG. 2 will be described with the same reference numerals. In Fig. 4, the currents i ₁ and i ₂ , i ₃ and i ₄ , i ₅ and i ₆ , i ₇ and i ₈ ,
Relays RY11 ( _{187S , 187G} ), _{RY12 ( 287S ,}
287G), RY13 (387S, 387G), RY14
(487S, 487G), RY15 (587S, 587G) and bus lines BUS ₁ , BUS 2, BUS 3 using currents i ₂ and i ₃ , i ₄ and i ₅ , i ₆ and _{i 7} , i ₈ and i _{9 i}・BUS ₄ relay RY21
(187BS, 187BG), RY22 (287BS, 287G),
RY23 (387BS, 387G), RY24 (487BS,
487G) will be installed. In addition, RY31 operates in the event of a consumer bus bar short-circuit accident by using the under-voltage relay 27 and the ground fault over-voltage relay 64, which use voltage V, and currents i ₁ and i ₁₀ and voltage V, and prevents the consumer secondary side short-circuit accident. Undervoltage relay with current compensation that sometimes malfunctions 2
It is 7S. The number of relays 27S is the same as the number of consumers, and there are 127S to 427S.

In the protection device shown in FIG. 4, the centralized protection means shown in FIG. 5 is usually used. In other words, the current transformer CT information of each customer is sent to the optical fiber cable via slave station devices SUB ₁ to _{SUB 4} installed at the customer.
The OPF ₁ to OPF ₄ are input to the central processing unit MAS to process the relay shown in FIG. This processed signal causes the substation and disconnection CB to be tripped by the central processing unit MAS, and the slave stations and disconnectors CB transfer the signal via optical transmission from the central processing unit MAS to each slave station SUB. Tripped.

The slave station devices SUB ₁ to _{SUB 4} include an analog-to-digital conversion (A/D) circuit, a sampling circuit, a transmission interface, an optical-electrical conversion circuit, an electrical-optical conversion circuit,
It consists of a power supply circuit, a microcomputer processing section, etc.
The central processing unit is similarly configured.

D Problems to be Solved by the Invention In the protective device configured as shown in Fig. 4, when a fault occurs at point _F , relay RY13 operates, and the trip commands for the breakers CB ₅ and CB ₆ are processed centrally. Device
The MAS transfers the information to the slave stations SUB ₂ and SUB ₃ , and the fault is cleared by tripping the breaker.

In addition, if _F2 point failure occurs, relay RY23
operates, and the central processing unit MAS sends trip commands to the breakers CB ₅ , CB ₆ , CB ₇ , and CB ₈ to the slave stations SUB ₂ ,
Transfer to SUB ₃ and SUB ₄ . F When a _3- point fault occurs, relay RY15 operates and the central processing unit
The MAS mustard breaker CB ₉ trip command is transferred and the mustard breaker CB ₁₀ is directly tripped.

However, when F ₁ point failure occurs, the breaker CB ₅
If it becomes inoperable, the back-up protection relay installed at the power substation will trip disconnector CB ₁ , resulting in a complete outage for L ₁ and L ₂ customers. By similar means, the disconnector CB ₆
In the case of failure, the shield breaker CB ₁₀ is tripped, and the L ₃ and L ₄ customers are completely stopped. When the F ₂ point fault occurs, the shield breaker CB ₅ is inoperable. vessel
CB ₁₀ is tripped, and all L ₁ and L ₂ customers are stopped. In addition, when a _three- point F fault occurs, if the breaker CB ₉ does not operate, the breaker CB ₁₀ will be tripped.
L ₁ , L ₂ , L ₃ , and L ₄ customers all had the drawback of being completely out of service.

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a ring line system protection device that minimizes the damage caused by power outage when a breaker fails to operate.

E. Measures to solve the problem: Input the current information of each customer into the central processing unit of the substation via the slave station equipment installed at the customer, centrally protect the lines and busbars in each section, and transform the substation. In a device in which a remote station's disconnector is tripped directly, and a slave station's disconnector is tripped from the central processing unit via the slave station device, the central processing unit is responsible for tripping the slave station's disconnector or disconnector directly. Due to the transfer trip command continuing even after the disconnection time has elapsed, there is a function to detect the inoperation of the disconnector described above, and a function that detects the inoperation of the disconnector after the disconnection is detected to be inoperable. It is characterized by having a function of forcibly setting the current information of the station to zero and performing relay processing.

F Effect With the above structure, the present invention can reliably trip the shingle breaker when the shingle breaker is inoperable, without adding any special device to the conventional device.
The scope of the total outage will be limited to the customers who have installed the relevant power cutoff.

G. Embodiment Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of the countermeasure for the failure of the shingle breaker in this embodiment. In the same figure, SUBnr (however, r
=1, 2...n) are slave stations, and MAS is a central processing unit installed in a substation. The central processing unit MAS
A circuit that has a function of making all the current information transmitted from the slave station n (however, n = 1, 2...n) to zero by the output signal of the chopper or disconnection inoperation detection circuit 1 and the circuit 1. 9, and a circuit 10 that processes each protective relay of the line and bus bar according to the output signal of the circuit 9,
The circuit 11 performs transfer trip processing based on the output signal of the circuit 10.

The above-mentioned shield breaker non-operation detection circuit 1 is a slave station device.
SUBr (r=1,2...n) to central processing unit MAS
The breakout information 2a about the breakouts CB ₂ , CB ₄ ...CB ₈ (shown in Figure 4) is transmitted to the breakouts CB 2 , CB 4 ...CB 8 (shown in Fig.
CB ₃ , CB ₅ . . . CB ₉ (shown in FIG. 4)'s breakout information 2b, and the even-numbered breakers CB ₂ , CB ₄ ... CB ₈ trip signals 3a from the transfer trip processing circuit 11. , trip signals 3b of odd-numbered shield breakers CB ₃ , CB ₅ . . . CB ₉ are applied. The above detection circuit 1
Of the above signals, signals 2a and 3a are applied to the AND circuit 4, the timer 6 is applied with the output signal of the AND circuit 4, and the signals 2b and 3 are applied.
an AND circuit 5 to which an input signal ``b'' is applied; a timer 7 to which an output signal of the AND circuit 5 is applied;
It consists of an OR circuit 8 which receives the output signals of the timers 6 and 7 at its input terminal and supplies the output signal to the input terminal of a circuit 9 which sets all the currents of the slave station device SUBn to zero.

With the above-described configuration, the breaker malfunction detection circuit 1 detects the AND circuit 4, 5, input signals 2a and 2b from the slave station device SUBn and trip signals 3a and 3b from the transfer trip processing circuit 11 are applied. Even after the AND conditions of AND circuits 4 and 5 are satisfied and the output is given to timers 6 and 7, the OR circuit 8 If the output signal continues to be sent, in this case, based on the judgment that the central processing unit MAS and the disconnector are not operating, the output signal of the OR circuit 8 will cause the slave station device SUBn to be activated. Set all current information to zero and process the related bus protection relays.

For example, in Fig. 4, when a failure occurs at _F1 point, if the non-operation of shield breaker CB ₅ is detected,
Currents i ₄ and i ₅ transferred from slave station SUB ₂ are forced to zero. Therefore, relay RY12 operates and trips shield breakers CB ₂ and CB ₄ . Therefore, it is possible to limit the damage to only the power outage of customer _L2 where the disconnector malfunctions. In particular, when the non-operation of breaker CB ₉ is detected in the event of F _3- point failure,
Since currents i ₈ and i ₉ are forced to zero, relay RY1
4 operates, tripping circuit breakers CB ₇ and CB ₈ ,
Damage to only consumer _L4 can be suppressed.

H. Effects of the Invention As explained above, this invention implements measures to prevent the breakers from operating when the breakers fail in response to the trip signal transferred from the central processing unit MAS installed in the substation. In addition to being able to keep the total outage range to a minimum (one customer), by setting the current data transferred from the customer to zero without adding any special functions to the device, This has the effect of being able to take measures to prevent the disconnector from malfunctioning.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a countermeasure against disconnection failure according to an embodiment of the present invention, Fig. 2 is a circuit diagram showing the configuration of a conventional ring system protection device, and Fig. 3 is a circuit diagram of the system shown in Fig. 2. Circuit diagram showing trip sequence, 4th
This figure is a circuit diagram of the conventional improved device shown in FIG. 2, and FIG. 5 is a circuit diagram showing the centralized protection means of the device shown in FIG. 4. MAS...Central processing unit, SUB...Slave station, 1...
...Shipping breaker inoperation detection circuit, 2a, 2b...Information on the shingle breaker CB transmitted from the customer to the central processing unit, 3a, 3b...From the transfer trip processing circuit (installed in the central processing unit) Sensing wire breaker CB
trip signal, 4, 5...AND circuit, 6, 7
...Timer, 8...OR circuit, 9...Slave station device
A circuit that sets all SUBn currents to zero, 10...
...Relay processing circuit, 11...Transfer trip processing circuit.

Claims (1)

[Scope of Claims] 1. A plurality of slave station devices each having a function of collecting and transmitting current information of slave stations in a ring system, and a function of receiving a transfer trip signal and tripping a disconnection switch of a slave station. , a function to receive information transmitted from these slave station devices, a means to collect substation current and voltage information and perform protection processing from both information, a function to trip the substation's circuit breakers, and a transfer trip. In systems equipped with a central processing unit installed in a substation that is equipped with the function of transmitting signals, the central processing unit must continue to issue transfer trip commands even after the disconnection time of the slave station or disconnection has elapsed. means for detecting the non-operation of the slot breaker of the slave station, and when detecting the non-operation of the slot breaker, the information on the current of the slave station whose slot breaker has become inoperable is provided. Forcibly set it to zero and operate the relay of the slave station,
A ring line system protection device comprising: means for tripping the slave station disconnector.