JPH0446057B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a method for controlling the tripping of transfer bus bars and breakers in a bus configuration substation with a transfer bus bar, and in particular to a method for controlling the tripping of transfer bus bars and breakers. The present invention relates to a method for controlling the tripping of a transfer busbar and disconnector which is provided in common to all feeder lines and can be removed from any of the devices.

[Background of the invention]

Figure 1 shows an overview of a substation with a busbar configuration with a transfer busbar, and it shows that multiple feeder lines (feeding lines or transmission lines) are commonly provided with transfer busbar breakers and disconnectors. Therefore, depending on the type of feeder line, there is a drawback that sufficient protection by a transfer bus line or disconnector is not provided.

In other words, the transfer bus 6, which is provided separately from the main buses 1A and 1B, is used in case the feeder line disconnector 5 breaks down, or during its maintenance, especially when the disconnect switch 2A (or 2B), the transfer bus disconnector 5 breaks down. power line 1 through the disconnector 3, disconnector 3, disconnector 5, 10
It was provided for the purpose of supplying power to 2. Here, only one system of feeder lines is shown to simplify the drawing, but there are 7 disconnectors for each feeder line.
A circuit consisting of A, 7B, 9, 10 and a feeder sheath breaker 8 is provided between the main buses 1A, 1B and the transfer bus 6. Normally, each feeder line is supplied with power through a feeder line disconnector 8 without going through a transfer bus 6, and in the event of an accident, a protective device 1 is provided for the feeder line.
Protection is achieved by removing the wire cutter 8 by the power line 1. However, if the feeder line disconnector 8 corresponding to any one feeder line fails, power is supplied to that feeder line via the transfer bus line disconnector 3 and the transfer bus 6. It is something that has become popular.

Incidentally, there are various types of feeder lines and disconnectors such as overhead lines, cable line transformer feeders, etc., but this poses a problem when various types of feeder lines are mixed. This is because, in general, a protection method using a protection device provided for the feeder wire is determined depending on the type of feeder wire. Therefore, no particular problem arises when power is supplied to the feeder line without passing through the transfer bus. However, if a feeder line cutter or disconnector breaks down, regardless of the type of feeder line, power will be supplied to the feeder line via the transfer bus line cutter or disconnector that is installed in common with the feeder line. However, the protection provided by the transfer busbar breakers is primary. Any feeder line may be supplied with power via a transfer line or disconnector, but all feeder lines are disconnected according to predetermined protective characteristics. Even if it is provided for common feeder lines, it cannot serve as representative protection. Note that the protection device 4 is provided to remove the transfer busbar sheath disconnector 3.

[Purpose of the invention]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a transfer bus that can be tripped in the event of a feeder line fault, no matter what type of feeder line is fed through the transfer bus or disconnector. The present invention also provides a method for controlling disconnection tripping.

[Summary of the invention]

For this purpose, the present invention provides that, when a tripping command is received from a protective device installed in a feeder line that is supplied with power from a transfer bus line disconnector, the transfer bus line disconnector is It is designed so that the disconnector can be removed.

[Embodiments of the invention]

Hereinafter, the present invention will be explained with reference to FIGS. 2 to 6 while also referring to FIG. 1.

First, the procedure for switching from the normal state to the transfer state will be explained with reference to FIG. Note that the normal state here refers to the disconnector 7.
A (or 7B), the case where both the feeder line disconnector 8 and the disconnector 9 are in the closed state, and the others are in the open state, and the transfer state and the disconnector 2A (or 2B), This refers to a case where the transfer busbar sheath disconnector 3 and the disconnectors 5, 10 are all in a closed state, and the others are in an open state.

Now, when switching from the normal state to the transfer state, first the disconnectors 10, 2A, and 5 are sequentially closed, and then the transfer bus line disconnector 3 is closed. It's summery. In this state, power is being supplied to the feeder line 12 not only from the feeder line cutter and disconnector 8 but also from the transfer bus line cutter and disconnector 3 at the same time (this state is called an intermediate state). ).
After this, the feeder line disconnector 8, disconnector 9, 7A
The transfer state is shifted to the transfer state by sequentially opening the terminals. The above explanation is based on the case where power is supplied from the main bus 1A.

FIG. 2 shows a circuit configuration for detecting whether the device shown in FIG. 1 is in a normal state, an intermediate state, or a transferred state. Contact point 2A-a in the figure is disconnector 2
This is a contact that opens and closes in conjunction with the opening and closing of A, and the other contacts are the same.

Therefore, as can be seen from FIG. 2, neither auxiliary relays 13 nor 14 are energized in the normal state, but both are energized in the intermediate state, and , in the transfer state, auxiliary relay 1
Only 3 will be excited. Therefore, by combining the contacts of the auxiliary relays 13 and 14, it is possible to detect each state.

Figure 3 shows the circuit configuration for detecting the state, and contact 13-b in the figure is auxiliary relay 1.
3, and contact 14-a indicates the make contact of the auxiliary relay 14. By exciting the auxiliary relays 15, 16, and 17, the normal state, intermediate state, and transfer state can be detected, respectively. Figure 4 shows how the make contacts or break contacts of the auxiliary relays 13 to 17 change when transitioning from the normal state to the intermediate state to the transfer state, but this is clear. Therefore, no special explanation is required.

Now, to explain the tripping control according to the present invention with reference to FIG. 5, auxiliary relays 15 to 1
When the make contacts 7 are connected, the trip command contacts 11-a ₁ and 11-a ₂ of the protection device 11 corresponding to electric wires are inserted and connected as shown. In a normal state, it is natural that the feeder line disconnector 8 is tripped in response to a tripping command from the protective device 11 installed corresponding to the feeder line, but in a transferred state, This is to cause the transfer bus bar sheath breaker 3 to be tripped in response to a tripping command from the protection device 11. As a result, no matter what kind of feeder line is being fed through the transfer bus line disconnector 3, if an accident occurs in that feeder line, the transfer bus line disconnector 3 will be activated. It is possible to remove it. Furthermore, in this example, in the intermediate state, both of the shears 3 and 8 are tripped by a tripping command from the protective device 11, but this also applies to the intermediate state. This is because there is a possibility that an accident may occur, and in the event of an accident, it is necessary to simultaneously trip the cutoff switches 3 and 8.

Finally, to explain the re-closing operation of the shinobu breaker with reference to Figure 6, the re-closing operation is generally performed after the shinobi breaker is tripped, but the re-closing operation is performed after it is tripped in the intermediate state. can be said to be undesirable. This is because if the breaker is reclosed at uneven closing times during switching of the breaker, arcing may occur in the breaker and the control will become unnecessarily complicated. As shown in the figure, for the make contacts of the auxiliary relays 15, 17 inserted in series with the closing coils 22, 21 in the cutters and disconnectors 3, 8, there are further reclose command contacts 20-a ₁ , 20-a _{2 .} are inserted in series, thereby prohibiting the re-closing operation in the intermediate state.

〔Effect of the invention〕

As explained above, the present invention is configured such that the transfer busbar breakers and disconnectors are tripped by a protection device provided for the feeder line. Therefore, in the case of the present invention, no matter what type of feeder line is used to supply power through the transfer bus line or disconnector, if an accident occurs in that feeder line, the transfer bus line or The effect is that the disconnector can be tripped.

[Brief explanation of the drawing]

Figure 1 shows an overview of a substation with a bus configuration with transfer busbars, and Figures 2 and 3 show the circuit configuration for detecting the state of power supply in that configuration. Figure 4 shows that when the power supply state transitions from the normal state to the intermediate state to the transfer state,
FIG. 5 is a diagram showing how the auxiliary relay in FIGS. 2 and 3 operates, FIG. 5 is a diagram showing the configuration of the tripping control method according to the present invention, and FIG. 6 is a diagram showing how the auxiliary relay according to the present invention operates. FIG. 3 is a diagram showing the configuration of an operating circuit. 1A, 1B...Main bus bar, 3...Shin breaker for transfer bus bar, 6...Transfer bus bar, 8...Shin breaker for feeder line, 11...(Compatible with feeder line) protection device,
12... Feeder wire, 13-17... (state detection) auxiliary relay, 18, 19... Trip coil, 20-a ₁ ,
20-a ₂ ...Reclosing command contact, 21, 22... Closing coil.

Claims (1)

[Scope of Claims] 1. In principle, power is supplied to one or more feeder lines from the main bus through a disconnector corresponding to the feeder lines, and any one of the feeder lines has a common transfer wire. A transfer bus disconnector tripping control method in a substation where power can be supplied via a bus disconnector is provided for a feeder line that is supplied with power through a transfer bus disconnector. 1. A method for controlling the tripping of a transfer bus line or disconnection switch, characterized in that when a protection device that is attached to the transfer bus line issues a trip command, the transfer bus line or disconnection switch is tripped in response to the command. 2. When any one feeder line is being supplied with power from either the switch or switch for the feeder line or the switch or switch for the transfer bus in the middle of switching the switch for the feeder line, The transfer busbar switch according to claim 1, wherein when the provided protection device issues a trip command, the switch corresponding to the feeder line is also tripped by the command. Disconnector tripping control method. 3. Unless any one feeder line is supplied with power from either the switch or switch for the feeder line or the switch or switch for the transfer bus, the protection device installed for the feeder line will Claims: When a circuit closing command is issued, the circuit breakers corresponding to the feeder line and the transformer busbar circuit breakers that were previously tripped are reclosed in response to the command. 2. The transfer busbar breaker tripping control method according to item 2.