JPS5956820A - Bus switching device - 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 present invention relates to an improvement of a bus switching device for a distribution line in a power system having a multi-bus configuration.

[Technical background of the invention]

FIG. 1 shows a single-line connection diagram of a power system having a multi-bus configuration. In FIG. 1, the first bus line (hereinafter referred to as
(referred to as the A bus) 12 and the second bus (hereinafter referred to as the B-i line) 13 are connected to a bus line communication breaker 3, a disconnector 10,
On the other hand, the city source 14 is connected to the A bus a! is connected to the disconnector 5 through the circuit breaker 2, and further through the disconnector 8,
9 is connected to the A bus 12 or the B bus 13.

FIG. 2 shows the disconnectors 6, 7. f) and g show the configuration of the operating circuit. In the figure, each disconnector is turned on by the corresponding operation switch 16, 17, 18, 19, respectively.
, r off'' operations are performed. In addition, each disconnector 6, 7
, 13.9 is constructed with the following interlock circuit so as not to open or close the load '4. To explain this using the case of the disconnector 6 as an example, when the disconnector 7 is open, it can be operated, and if the iJr device 1 is also open, it can be operated.
l) of the disconnector 7 to the closing coil 6C and the tripping coil 6T.
Contact 7b and contact 1b of circuit breaker 1 are connected in series.

Next, when switching the electric gamma piece 14 from the A bus 12 to the B bus 13 without power outage from the state where the disconnector 6 is closed and the disconnector 7 is open, the busbar communication breaker 3 and the disconnector 10 are .11
Both are closed, then the disconnector 7 is closed, then the disconnector 6 is opened, and finally the busbar connection switch 3 is opened to complete the busbar switching. The interlock conditions for this are
A contact 10a of busbar communication breaker IO, disconnection 8, 10
, I I A contacts 10a, Ila, and changeover switch contact 20a (busbar connection breaker trip "lock"
The condition that the contacts of the disconnector 6 are connected in series is that the operating circuit of the disconnector 6 is connected via the a contact 7a of the disconnector 7, and the operating circuit of the disconnector 7 is connected via the a contact 6a of the disconnector 6. connected via. The operation of the disconnectors 8 and 9 is also the same, although the explanation will be omitted.

FIG. 3 shows an operating circuit for the busbar communication breaker 3. In the figure, the busbar communication breaker 3 is operated by an operation switch 23 to turn it on or off. A trip command from the a contact 22a of the protective relay 22 is also connected. Note that a contact 20b of a changeover switch (opened when the busbar connection breaker 3 trip is "locked") is connected in series with the trip coil 3T.

Next, we will discuss the purpose of the changeover switch contact 20a in FIG. 2 and the changeover switch contact 20b in FIG. This is to prevent the load current or fault current from being cut off by the disconnector.

For example, when switching the power supply 14 from Affi: line 12 to f3f) line 13 without interruption, the operation procedure described above is followed, but from the state where both disconnectors 6 and 7 are closed,
Immediately after issuing the “off” command, the busbar communication breaker 3
When a “off” command is issued from the operation switch 23 or a “off” command is issued from the protective relay 22, the disconnector 6
The FFI line connection breaker 3 may open before the FFI line is opened. At this time, the load current or fault current will be cut off using the disconnector 6, and there is a risk that the disconnector 6 will be damaged.
Uninterruptible switching of the - bus bar is made only after the bus 3 trip is "locked".

11 Problems with Background Technology] According to Jukutoshi et al., the above-mentioned conventional busbar switching circuit is accompanied by the hassle of having to operate the changeover switch each time the busbars are switched without interruption (2005). If you leave the 9J pJ+ switch in the “locked” state and turn it back on,
During normal operation, the A-FfJ, line 12°B bus 13 is connected by the bus-bar connection breaker 3, so that even if an accident occurs during operation and the protective relay 22 for bus-bar connection operates, the bus-bar connection There is a drawback that the circuit breaker 3 is not tripped and learns from a major accident.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and its purpose is to automatically trip-lock the bus-bar communication breaker during uninterrupted bus-bar switching, eliminate the complexity of operation, and restore the changeover switch. To provide a busbar switching device capable of performing safe busbar switching by reliably preventing the locking of a trundle command from a protective relay due to forgetting.

[Summary of the invention]

In order to achieve the above object, the present invention makes it possible to ensure that both circuit breakers connected to the bus bar 1111 of the distribution line are in the closed state at the time of uninterruptible switching of the distribution current bus in a power system with a multi-bus configuration. [Embodiments of the Invention] The present invention is illustrated in the drawings below. An example will be described.

FIG. 4 shows the anatomy of the disconnector operating circuit in the busbar switching device according to the present invention, and the same parts as in FIG. 2 are given the same reference numerals and the explanation thereof will be omitted. That is, in FIG. 4, the contact 20a of the changeover switch in FIG. 2 is removed.

FIG. 5 shows a configuration example of a busbar communication breaker operating circuit in a busbar switching device according to the present invention, and the same parts as those in FIG. In other words, FIG. 5 shows the contact point 20 of the changeover switch in FIG.
b is deleted, and in its place is provided a b contact 23b of the divine assistant relay 23, which is configured to operate when the disconnectors 6, 7 or 8, 9 are both closed.

In the busbar switching device having such a configuration, when the disconnectors 6 and 7 or the disconnectors 8 and 9 are both closed for uninterrupted bus switching, the a contact 6 of the disconnectors 6, 7 or 8, 9 is closed.
The combination of a and 7a or 8a and 9a operates the Kamisuke relay 23, and its b contact 23b opens to automatically lock the trip circuit of the busbar communication breaker 3 shown in FIG. As a result, when both the disconnectors 6 and 7 are closed, or when the disconnectors 8 and 9 are both closed, the trip of the busbar communication breaker 3 is locked, and the trip of the disconnector 6, 7 or 8 is locked.
.

In this way, in a power system with a hinoki bus configuration in which the first and second bus connections 12 and 73 are connected to each other by interconnecting the busbars, the busbars of the distribution lines in the eM power system are Switches 16 and 17 for operating the disconnectors 6, 7, and 8.9 connected to the 12.13 side, and a switch 23 for operating the circuit breaker for connection to the busbar 3. A circuit breaker operating circuit for connecting I line, which is manually cut off by a person and also cut off by a trip command 22a from the protection g appliance of the system, and the bus bar 12 of the distribution line when the above distribution line (bus line uninterrupted switching) is performed. ,7311
11, each breaker 6°7 or 8,
When it is detected that both 9 are in the closed state, the bus bar switching breaker 3 is tripped by the operation circuit under the acid conditions under the above conditions. , 1. ＋So that it becomes (strained).

II: At the time of busbar 72.7 alov uninterrupted switching, the trip lock of the busbar communication circuit breaker 3 is automatically locked instead of manual locking with a changeover switch, which eliminates the complexity of operation, and also prevents accidents due to forgetting to return the changeover switch. The problem that the trip command from the frame relay is locked is also solved, and the device can perform busbar switching with extremely high reliability.

〔Effect of the invention〕

As explained above, according to the present invention, the trip lock of the busbar communication breaker can be automatically performed at the time of busbar uninterrupted switching, which eliminates the complexity of operation and eliminates the problem of forgetting to return the changeover switch. Protected forest 1) It is possible to provide a busbar switching device that can prevent the trip command from the device from being locked and perform safe busbar switching.

[Brief explanation of the drawing]

Fig. 1 is a wire connection diagram showing a 1L power system with a multi-14 wire configuration, Figs. 2 and 3 are diagrams showing a conventional motherboard and switching device, and Figs. 4 and 5 are diagrams of the present invention. FIG. 2 is a circuit diagram showing one embodiment of the present invention. 1.2.3... Breaker, 4, 5, 6, 7,
8゜9.10.11... Disconnector, 12.13 Pa/bus, I4... Weight, 15... Load, 16, 17.1B
. 19.23... Operation switch, 20a... Switching switch contact, 20h... Switching switch - incorrect contact, 2Z...
Instrument current transformer, 22...Protective relay, 23...Aisuke Jundenki, 3C, 6c, 7c, 8c, 9cm = closing coil,
3T, 6T, 7T, 8T, 9T...Trip coil. Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 2 Figure 3 Figure 4! l! Q

Claims (1)

[Claims] 0! ], in a power system ζ having a multi-bus configuration in which the second power line is interconnected by a busbar connection breaker, the disconnector connected to the busbar side of the distribution line in the power system is operated by an operation switch. A disconnector operation circuit that is manually disconnected, and a busbar communication circuit breaker that is manually disconnected using an operating switch, and a busbar communication breaker that is disconnected by a trip command from the protective relay of the system itself. circuit and the above-mentioned space 4
H;, Busbar 1 of the distribution line during uninterrupted bus switching of In
and a lock circuit that locks the busbar communication circuit breaker from tripping by the operation circuit while the condition is satisfied, provided that both circuit breakers connected to the FII are detected to be in the closed state. A busbar switching device characterized by comprising: