JPS59165911A - Reclosing system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The invention relates to the improvement of a 44-circuit system for checking the interconnection of a system based on information on circuit breakers and new circuits in live line protection.

[Technical background of the invention and its problems]

When a fault occurs in a power transmission line, the power line is disconnected from the grid and the fault is removed. However, since most transmission line faults are discontinuous, the arc extinguishment time is determined after the fault current is cut off. After a period of time has elapsed, the automatic rerouting method, in which the transmission line is rejoined to the grid and power transmission resumes, is an effective means of improving the transient stability of the grid. As is well known, the re-closing of a power system requires that the power sources at both ends of the power transmission line that was cut off due to an accident operate synchronously. The presence or absence of synchronized operation of the grid is determined when high-speed re-closing is required or when multi-phase re-circuiting is performed using a parallel two-concave power transmission line (2 is grid interconnection confirmation (2).

Conventionally, two methods have been used to perform grid connection confirmation: a method using a 1iiA flow detection relay device and a method using a breaker information @ (2). (A two-way current detection relay is installed to determine the presence or absence of power flow (the presence or absence of two-way interconnection), which has the advantage of being able to confirm υ interconnection only with the relay at its own end. Relays must be set to a certain high value in order to avoid malfunctions due to line charging current (2).Therefore, if the current is less than this setting value, there is a risk that it will be mistakenly judged as non-compliant, so it is necessary to Confirmation of grid connection cannot be expected.On the other hand, the latter method detects the open/closed state of the breaker according to pallet conditions, and determines whether the breaker is connected at both the own end and the other end of the protection section with the breaker closed.
Since it is necessary to transmit the breaker information of each terminal in the protected area, the number of transmitted and received signals will increase, but if the transmission means can be easily used It is possible to do this.

Taking the parallel two-circuit power transmission line in FIG. 1 as an example, a conventional interconnection confirmation method using breaker information will be described when a polyphase reclosing method is applied.

'Electrical stations A, B, and C each have parallel two-circuit transmission lines 1-1.
and 1-2, forming a three-terminal system. Breakers 2a112b1+ 2cl and 2a2+ 2b2 are installed at the connection between each electric station and the parallel two-line power transmission station.
+2c2 is installed. Now, an internal failure has occurred in the grid, and circuit breakers 2a□, 2bI, 2cl, and 2az
, 2b2 + 2c2, if the breaker associated with the fault phase (2 However, if the number of healthy phases satisfies the interconnection condition, reclosing is carried out.Usually, the interconnection condition is determined to be satisfied when the number of healthy phases is 2 or 3 phases remaining by summing both circuits. Ru.

By the way, in general (-), electrical stations may be disconnected from the grid and shut down due to operational operations (2). It is not possible to specify whether the terminal is at rest or not from only the open/open information.Therefore, if the electrical station is at rest (2), regardless of the breaker information sent from the at-rest end, it is impossible to specify whether the terminal is at rest or not. It is necessary to control the grid connection confirmation circuit to disable the grid connection confirmation based on the breaker information (-).

Figures 2 and 3 are logic circuits showing the conventional polyphase reclosing (two-way interconnection confirmation method). Figure 2 shows the 1-segment line of electrical station A in Figure 1 to simplify the explanation. 1-1 (A in two places
This shows the grid connection confirmation method between the end and the B end. 1 minute line R interconnection signal 3R construction is line 1 circuit breaker 2 of electrical station A and B
When the R phase of a, I 2b, is closed, it is determined that the R phase is connected and becomes °゛1''. Bisector line R interconnection signal 3R2
When the R phase of line 2 line disconnectors 2a2 + 2b2 of electrical stations A and H is closed, it is determined that the R phase is connected and the result is 1'' (2).

Thereafter, the presence or absence of interconnection of the S phase and T phase is determined in the same manner. Note that 3S+ and 3T+ are the interconnection signals of No. 1 S phase and T phase, respectively, and 3S2 and 3T2 are the interconnection signals of No. 2 S phase and T phase, respectively.
Indicates the phase interconnection signal. The interconnection signal of each phase is OR circuit 4R
, 4S, 4Tf - 1,2 for each phase by introducing them respectively.
Take the or condition of the line. Next (2. Grid connection condition determination circuit 5 (
2. Therefore, it is determined whether the polyphase recirculation condition between the points A and B is satisfied or not, and the interconnection condition determination output 6 is input to the AND circuit 7. One input 8 of AND circuit 7
is the No. 1 gland body signal at the B end, which will be described later. When the No. 1 line at the electrical station B is in continuous use, the B end No. 1 class stop signal 8 does not detect the rest end and is set to "0'", so there is no knot. The output of the circuit 9 is 61", and the output 10 of the AND circuit 7 is the grid connection condition judgment output 6. On the other hand, when the branch line of electric station B is inactive (the second is 1 minute line stop signal 8 is °'1”i
2, the AND circuit 7 is locked, and the A and B good luck system 1 gear 10 is 0'' (2 is controlled, so the electric station A-8
It is determined that there is no 1-segment line interconnection between them. By the way, B end 1
The branch line stop signal 8 is transmitted from the B end shown in Figure 3 (2) to the installed break end detection circuit
Pallet conditions for each phase of 11R, IIS, IIT are 3
If the AND circuit 12 detects that both phases are open, or if the disconnector condition 13 is open (MIOR circuit 14) (
Two.

Now, when the parallel two-circuit power transmission line (2) in Figure 1 is suspended for 1 minute at the B end and 15 cl is suspended for 1 minute at the C end, that is, under the system conditions shown in Figure 4, line 1 (= internal Failure f
Suppose that l occurs. In Figure 4, the same parts as in Figure 1 are given the same numbers and will be explained.

The 1-segment line 1-1 at electrical station A is connected to circuit breaker 2 to eliminate faults.
The faulty phase of a1 is tripped. When performing multiphase reclosing, the reclosing condition is either 2 remaining healthy phases or 3 remaining healthy phases in the total of 2 transmission lines, and the interconnection conditions are checked, as shown in Figure 4. In the case shown in Figure 2, in the grid connection confirmation circuit between A-8, the bisector line connection signal 3R
2-382, 3T2 becomes °l" with grid connection, so regardless of whether the grid connection condition is selected as 2-phase remaining or 3-phase remaining, the condition is met and the judgment output 6 is N. I I+.Also, the interconnection between A-0 is established in the same way as above.However, the B end No. 1 gland 15b1 and the C end 1 minute line 15c
1 is a pause, so the pause end detection circuit in FIG. i and is transmitted to the A end.

Therefore, the grid connection condition is satisfied in the A-end grid compliance confirmation circuit (both are unchanged, and the υ grid-connection judgment output 6 is ANDed by the halt signal of the B-end 1-segment line and the C-end No. 1 group). 7, both the A-B communication system and the A-6 connection are controlled without connection, and the A-end No. 1 paddy cannot be reclosed.

Next (2. Parallel two-line transmission line in Figure 1 (2) When the B end is 1 minute line pause 15b1 and the C end is 2 minute line pause 15c2, that is, when the system condition shown in Figure 5 is 1 line (= Suppose that an internal failure f2 has occurred. 1 of electric station A and electric station C)
The faulty phase of the line breakers 2a, 2c4 is tripped to remove the fault. At this time, the A-end 1-segment line A-B incorrect system confirmation circuit in Fig. 2 maintains the 3-phase interconnection with Line 2, so the interconnection judgment output 6 becomes Ill'', but B Edge 1
Separate line pause 15b1+=Yo! Ill Controlled without interconnection between A and B. On the other hand, Line 1 has been cut off due to an accident, and Line 2 has its C end closed, so if the A-C incorrect system is confirmed, there will be no interconnection. Therefore, if you select the condition of two phases remaining as the interconnection condition, when one phase fails (- means the interconnection condition is satisfied only under the condition of line 1, but if there is a failure of two or more phases, A-C There will be no interconnection between them.Furthermore, if three-phase remaining is selected as the interconnection condition, there will be no interconnection between A and C in all failures, and re-closing cannot be performed.

As explained above, in the cases shown in Figures 42, 4, and 5, there is a connection between electrical station A and B (No. 2@il2) (despite the fact that the Even if the signal (2) indicates that the interconnection condition is forced (= not established (2) and the re-closing is possible, the re-closing will be prevented. And,
Once a line has fallen out of the system, it is not easy to restore it, and requires IH at the time of restoration, so if it is possible to reclose it (=, it is important to reclose it as much as possible. Under the system conditions in Figure 4, both the B and C ends of Class 1 are connected (even if the circuit cannot be reclosed due to the two-body stop, it does not cause a supply failure, but the power transmission line is always charged, It is extremely advantageous in terms of operation to be able to connect two systems in parallel by simply closing the breaker at the B or C end.

[Purpose of the invention]

The present invention eliminates the drawbacks of the above-mentioned conventional grid connection confirmation using breaker information, and its purpose is to ensure reliable grid connection confirmation even in systems where there are two terminals (to ensure that the connection is confirmed at the other end of the system). There is a method to provide.

[Summary of the invention]

The non-invention is to achieve the above purpose (2. When the breaker and new circuit switch at the own end and the breaker and disconnector at the other end are both "closed", it is determined that there is interconnection and In the re-closing method as the closing condition (-, when an idle terminal at the other end occurs, exclude the breaker information of the idle terminal and check the interconnection conditions with the remaining 9 terminals). This is what I did.

[Embodiments of the invention]

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

Figure 7 is used to simplify the explanation.
Terminal system (2) Between electrical station A and B on line 1 of electrical station A (2) This is a logic circuit when the interconnection confirmation method according to the present invention (2) is applied, and is the same location as the logic circuit in Figure 2. (2 will be explained with the same reference numerals.The method for checking interconnection between other electric stations is the same as the method for checking interconnection between electric stations A and B (-), so the explanation will be omitted because it can be configured. .1 minute line R phase interconnection signal 3R, is line 1 shiya @ equipment 2a of electrical stations A and B.
When the R phases of 1 and 2b are closed, it is determined that R@Zen is connected and "1"' (2).

2 side line R phase interconnection signal 3R22 indicates that the R phase of line 2 circuit breakers 2a2t and 2b2 of electrical stations A and B are closed and B
When the AND condition that the end bisecting line is not at rest is satisfied, it is determined that the two-pair line R is interconnected, and becomes 1'' (=.

Hereinafter, similarly (the presence or absence of interconnection of the two S phase and T phase is the S difference system signal 3S1, 3822 and the T difference system signal 3Tt, 3T
22 (= determined accordingly. In addition, 381 and 3'L
3S22 and 3T22 indicate interconnection signals of the 1-force line S phase and T phase, respectively, and 3S22 and 3T22 indicate interconnection signals of the bisecting line S phase and T phase, respectively.

Line 1's different signals 3R+, 3S+, 3T+
The AND circuits 17R, 17S, and 17Tf are respectively introduced, and after taking the AND condition with a signal obtained by inverting the B end 1-segment line pause signal 8 into the NOT circuit 9, the AND condition output 3Rn + 3Su + 3Tn Kao 7 circuits 4R, 4S, 4'll: Introduced. Further, the AND condition outputs 3Ru, 3Sn, and 3T1□ are passed to line 2 as respective different signals of line 1.

On the other hand, each different system signal 3R22, 3S22, 3 of No. 2 S
T22 is directly introduced into the OR circuits 4R, 4S, and 4T, and the 1-segment line interconnection signals 3R+, 3S+, 3'r+ and the body signal 8
AND condition output with the inverted signal of 3R, □, 3s1□, 3
After taking the OR condition for T1□ and each phase, the interconnection condition determination circuit 5 determines whether the interconnection condition between electrical stations A and B is satisfied or not, and the result is determined between A and B. It is output as a listening system signal 1o.

Next, the operation of the reclosing method according to the present invention will be explained.

Figure 4 ('''-terminal system shown)
Line 1 is out of service (=If an internal failure f1 occurs, confirmation of communication between A and 'B at electric station A is made by sending the B end No. 1 line outage signal 8.
Different signals 3R, 3S, on Line 1.

3T, is locked, but each different system signal 3R2 of line 2
Since 23S22 and 3T22 are 3-phase interconnected and the interconnection condition is satisfied, the A-B incorrect system signal 10 becomes 1'', and the A terminal is interconnected and reclosed. Between A and 0. The same goes for grid interconnection (Secondly, Ags is reclosed.

In addition, Fig. 5 (3-terminal system shown in -)
Line 1 and Line 2 of Electrical Station C are suspended (Line 21 (1)
If an internal failure f2 occurs, the electrical station A (A- at -
B-related system confirmation is for each different system signal 3R22, 38 of Line 2.
22, 3T22 i Since the interconnection conditions are established for two- to three-phase interconnection, the A-terminal re-closing is performed. When checking the connection between l and 0, due to the suspension of the C-end 2-segment line, the 2-segment line each phase interconnection signal will be disconnected for all 3 phases, so only the healthy phase of line 1 will be interconnected. Therefore, if the interconnection condition is 2 phases remaining, 2
If there is a failure in one phase or more, and three phases remain (- means all failures (it is determined that there is no interconnection between two A and C), it is possible to select an appropriate reclosing condition.

Furthermore, in the 3-terminal system C2 shown in Figure 6, similar to the 3-terminal system in Figure 5, there was an internal failure in Line 2 while the No. 1 wire of electric station B and the No. 2 wire of electric station C were out of service. When f3 occurs, one line of force is suspended between A and B, and there is no interconnection due to a two-pair line fault. On the other hand, when checking the A-0 interconnection, since the C end 2-segment line is out of service, all three phases of the different system signals over No. 2 are not interconnected, so only the healthy phase of Line 1 is interconnected. Therefore, as in the case of Fig. 5 above, the interconnection condition is that in the case of the remaining 2 boxes, there is a failure of 2 or more phases, and in the case of the remaining 3 phases, in the case of a failure in all cases, A-0 interconnection is required. It is determined that there is no such condition, and it becomes possible to select an appropriate reclosing condition.

〔Effect of the invention〕

According to the invention, when there is a dormant terminal in the grid connection confirmation based on the breaker information on the restarted circuit (secondly, only the breaker information of the dormant terminal is excluded from the grid connection confirmation, and the connection with the remaining terminal is Since grid interconnection is confirmed, it is possible to provide a re-closing method that enables quick accident recovery in the event of a grid failure by appropriately confirming grid interconnection and recirculating as much as possible.

[Brief explanation of drawings]

Figure 1 is a 3S4 subsystem diagram of a parallel two-line transmission edge, Figure 2 is a circuit diagram of a conventional grid connection confirmation method using breaker information,
FIG. 3 is a circuit diagram for detecting a dead end, FIGS. 4 to 6 are three-terminal system diagrams with different internal failures and dead ends, and FIG. 7 is a circuit diagram showing an embodiment of the present invention. . 1-1.1-2...Fuken line, 2a+ 12a2+ 2bl, 2b2 + 2c4
12c2 +++ breaker, 3R1, 3 pieces, 3St,
3S2.3T; , 3T2...each different signal, 3R1
11gR2□, 3S1+, 3S2□+ 3Tst
+ 3T2□...Each different signal, 4L 4S, 4
T, 14...OR circuit, 7, 12.17R, 17
S, 17T...AND circuit, 5...Grid connection condition judgment circuit, 6...Grid connection condition judgment output, 8...Stop signal, 9...NOT circuit, 10...Grid connection signal Output, 15bl, 15c1, 15c2 --- Pausing end, f
l, f2. f3...Internal failure. (8733) Agent Patent Attorney Yoshiaki Inomata (Q
Shiriki S1 person) Figure 3...Tera 4'7,7 Figure 4 Figure 5

Claims (1)

[Claims] (1) In the re-closing method, when the breaker and disconnector at the own end and the breaker and new circuit switch at the other end are all "closed", it is determined that the connection is connected and the re-closing condition is set. - A re-closing method characterized in that when a dormant terminal occurs, the breaker information of the dormant terminal is excluded and the interconnection conditions are checked with the remaining terminals.