JPS6230414Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a test circuit for a housed disconnector in a closed switchboard.

In recent years, the control systems of closed switchboards that house disconnectors have become more complex, and as a result, the control circuits have also become more complex, and their reliability has also been required. Malfunctions in the closing and tripping operations of the circuit breaker have also become a problem, especially the inability to trip due to failure in closing or failure. For this reason, operation tests are conducted on the breaker on a regular basis. The methods for this operation test include the so-called unit test, in which the operation of the shield breaker alone is tested with the shield breaker pulled out to the test position with the main circuit disconnection section open, and the opening/closing test of the shield breaker. Sequence tests are being conducted on the circuit and disconnectors, which are performed by connecting auxiliary contacts linked to the system during the sequence of the entire system. Both of these tests need to be able to be performed arbitrarily as needed, and it is desirable to be able to select either test method by simple switching.

However, in the past, the operation circuit was automatically switched by moving the disconnector from the connection position where the main circuit disconnection section was connected to the test position where the main circuit disconnection section was opened, and the operation circuit was automatically switched. In order to switch to a sequence test, it is necessary to cause a position switch, which will be described later, to perform a special operation, and the structure of the position switch is complicated. This point will be explained in detail below.

FIG. 1 shows a state in which a conventional closed switchboard 1 has a shingle breaker 2 stored therein, and the shingle breaker 2 is in a test position.
The control circuit disconnector 4 is connected and the position switch 8 is opened. The details of the relationship between the shield disconnector 2 and the control circuit disconnector 4 are shown in FIG. Position a of the shield breaker 2 in Fig. 2 indicates the connection position where the shield breaker 2 is connected to the main circuit disconnection section on the panel side, and position c of the shield breaker 2 indicates the connection position where the shield breaker 2 is connected to the main circuit disconnection section on the panel side. The test position is shown separated from the disconnection section. The control circuit disconnecting section 4 has a fixed contact 4a fixed to the closed switchboard 1, and a movable contact 4b of the breaker 2 moves from the connection position a to the test position c.
They contact each other for a while, and separate when they are further pulled out from the test position c. A plurality of control circuit cross sections 4 are arranged in parallel in a direction perpendicular to the direction of entry and exit of the cutter 2, and as an example of one circuit, the power supply _P1 is connected to the input switch 7c of the central operation panel 7 and the position switch 8a of the position switch 8. The contact 8a is connected in series, the closing switch 6c of the unit test switch 6 and the b contact 8b of the position switch 8 are connected in series, and these are connected in parallel. When the polygon switch 8 and the disconnector 8 and the disconnector 2 reach the connection position a, the a contact closes and the b contact opens, and when it leaves the connection position a, the a contact opens and the b contact closes. do.

FIG. 3 is a connection diagram showing a circuit breaker operating circuit. The closing coil CC of the circuit breaker 2 is connected to a control relay X.
The a-contacts Xa of the breaker 2 are connected in series to the power sources _P1 and _N1 via the control circuit disconnecting section 4. For turning on the breaker 2, a turn-on switch 6c for unit testing and
The input switch 6c has one end connected to the power source P1 and the other end connected to the control circuit disconnecting _{section 4} via the b-contact _8b1 of the position switch 8, and the input switch 7c has one end connected to the power source _P1 and the other end connected to the control circuit disconnecting section ₄ via the a-contact 8a1 of the position switch 8. The breaker 2 side is connected in series with the control relay X and the auxiliary relay Y to the control circuit disconnecting section 4.
and connected to the power source _N1 through the auxiliary b contact _12b1 of the breaker 2 and the auxiliary relay Y in parallel with the control relay X.
The a-contact Ya and a condition contact L which closes only when the switch is in the connecting position or the test position are connected in series.

For tripping the breaker 2, there are a single unit test tripping switch 6o and a tripping switch 7o for normal tripping and sequence test. The tripping switch 6o has one end connected to the power source _P2 and the other end connected to the a of the position switch 8.
The tripping coil 7o has one end connected to the power source via the contact _8a2 .
P ₂ , and the other end is connected in parallel to the control circuit disconnecting unit 4 via the b-contact 8b ₂ of the position switch 8, and a red lamp R
is connected in parallel with the switch 7o. The breaker 2 side is connected in parallel with the tripping coil TC, and auxiliary a-contacts _12a1 , _12a2 of the breaker 2 are connected in series to the control circuit disconnecting unit 4, and one end is connected to the power source _N2 via the other control circuit disconnecting unit 4.

One end of the green lamp G indicating the open state of the shield breaker 2 is connected to the power supply N ₂ , and the other end is connected to the power supply P 2 through the operation circuit disconnecting section 4 and through the b auxiliary contact 12b ₂ of the shield breaker _2. is connected to. Auxiliary a contact 1 of shield breaker 2
2a ₃ and the auxiliary b contact 12b ₃ are for transmitting an open/close state signal of the shingle breaker 2 to the entire sequence circuit (not shown). The auxiliary a-contact 12a ₃ connects the a-contact 8a ₃ of the position switch 8 in series to the external connection terminals 14a ₁ and 14a ₂ via the operation circuit disconnection section 4. The auxiliary b-contact _12b3 is connected in parallel to the b-contact _8b3 of the position switch 8 via the contact circuit disconnection section 4.

FIG. 3 shows a state in which the edge and disconnector 2 is pulled out from the connection position a to the test position c. In this state, the position switch 8 returns to the state shown in the figure, and the closing switch 6c and the tripping switch 6o for unit testing are activated. A circuit that can open and close the Deshiya disconnector 2 is configured, and a closing switch 7 for remote operation is installed on the central operation panel 7.
c and trip switch 7o are cut off.
In addition, at the connection position a, the position switch 8 is switched to the opposite state as shown in the figure, and opening/closing operations from the central operation panel 7 are possible, and the closing switch 6c for unit testing is turned on.
And the circuit of trip switch 6o is cut off.

The position switch 8 switches the disconnector operating circuit as described above between unit testing and remote operation.
The auxiliary contact circuit used for interlocking with the outside is also disconnected. That is, in the circuit breaker unit test, in order to prevent the operation of the auxiliary contacts 12a ₃ and 12b ₃ of the circuit breaker 2 from affecting the external sequence, the contacts of the position switch 8 are closed, and the circuit of the contact 12a 3 is closed, and the circuit of the contact 12a ₃ is closed. The circuit of contact _12b3 is closed. On the other hand, in the case of a sequence test, the opening/closing signals of these auxiliary contacts 12a ₃ and 12a ₃ must be output to the outside, but as mentioned above, at the test position, the above signals can be output to the outside by the action of the position switch 8. I can't.

At test position c, the switch 6c and trip switch 6o can be operated to operate the disconnector alone, but for the entire sequence test including the central operation panel 7, red lamp R, and green lamp G, the position switch 8 must be operated. It's not possible because it's open. That is, there is a problem that the soundness of the same circuit configuration as that at connection position a cannot be tested. Therefore, in order to eliminate this inconvenience, it is necessary to set the position switch 8 in the same state as the connection position a.

FIG. 4 shows an example of how the position switch 8 is operated. The lever 10 is pulled to the left, the push plate 9b is rotated clockwise about the fulcrum 9a, and the position switch 8 is activated. Therefore, the contacts of the position switch 8 shown in FIG. however,
The structure for operating such a position switch 8 is complicated, and when driving, the handle 10
There was a drawback that if the disconnector 2 was inserted into the connection position a without being returned, it would be damaged.

The object of the present invention is to provide a closed switchboard that allows easy switching between unit testing and sequence testing by operating a changeover switch at the test position, and allows safe operation.

The present invention will be explained below with reference to an embodiment shown in FIGS. 5 to 10. FIG. 5 shows the schematic structure of the closed switchboard 1 according to the present invention. The control circuit disconnecting section 3 on the panel side, which comes into contact with and separates from the movable contact 2a of the control circuit on the side of the shield breaker 2, is a movable contact only when the shield breaker 2 is in the connected position, as shown in FIG. 6a. 2a, and a second fixed contact 3b that contacts the movable contact 2a only when the shingle breaker 2 is in the test position, as shown in c in the same figure. However, between the connection position and the test position, the movable contact 2a is connected to the fixed contact 3a, as shown in FIG.
It is separated from 3b. Further, a changeover switch 5 for switching between a unit test and a sequence test at the test position is mounted on the closed switchboard 1.

Fig. 7 is a connection diagram showing the breaker operation circuit, where the closing coil CC of the breaker 2 is connected to the a of relay X.
Contacts Xa are connected in series to form movable contacts 2a ₁ , 2a ₂
but the first contact only at the test and connection positions.
It is connected to power supplies P ₁ and N ₁ on the panel side through fixed contacts 3a ₁ , 3a ₂ and 3b ₁ , 3b ₂ . For the closing operation of the shield breaker 2, there is a closing switch 6c dedicated to unit tests, and a closing switch 7c for normal closing operations and closing operations during sequence tests.
The closing switch 6c has one end connected to the power supply _P1 , and the other end connected to the test position disconnection contact _3b3 via the contact _5a1 by switching to the independent test side of the changeover switch 5, that is, the direct operation side on the left side in the figure. is connected to. The input switch 7c has one end connected to the power supply _P1 , and the other end connected to the normal and sequence test side of the changeover switch 5,
That is, it is connected to the second fixed contact 3b 3 for the test position via the contact 5b ₁ that closes when switched to the far operation side on the right side in the figure, and the other is connected to the first fixed contact 3b ₃ for the connection position. Connected to 3a ₃ .

The relay X and the auxiliary relay Y provided on the shield breaker 2 side are connected in series, and the auxiliary b contact of the shield breaker 2 is connected in parallel with the auxiliary relay Y (the contact that closes when the shield breaker 2 is open) 12b. ₁ , the auxiliary relay Y contact Ya, and _the conditional contact _L that closes only at the connection position and the test position are connected in series _. The movable contact 2a ₄ at the other end is connected to the power source N ₁ via the first fixed contact 3a ₄ or the second fixed contact 3b ₄ .

The external trip circuit of the circuit breaker 2 includes a trip switch 6o for unit testing and a trip switch 7 for normal trip operation and trip operation during sequence test.
There is o. The trip switch 6o connects one end to the power supply _P2
The other end is connected to the second fixed contact 3b ₄ for the test position via the contact 5a ₂ of the changeover switch 5. The trip switch 7o has one end connected to the power supply P ₂ , one end connected to the second fixed contact 3b ₅ via the contact 5b 2 of the changeover switch ₅ , and the other end for the direct connection position. A red lamp R indicating the closed state of the trip switch 7o and disconnector 2 is connected in parallel to the first fixed contact _3a5 .
On the edge breaker 2 side, one end of the tripping coil TC is connected to a movable contact 2a ₅ connected via auxiliary a contacts (contacts that close when the edge breaker 2 is turned on) 12a ₁ and 12a ₂ connected in parallel with each other. The movable contact 2a ₅ at the other end contacts the first fixed contact 3a ₅ or the second fixed contact 3b ₅ through the first fixed contact 3a ₆ or the second fixed contact 3b ₆ . Connected to power supply _N2 .

The line lamp G indicating the open circuit state of the shield breaker 2 is connected at one end to the power supply N ₂ and the other end is connected to the circuit breaker 2 via the first fixed contact 3a ₈ or the second fixed contact 3b ₈ . It is connected to the power supply _P2 through the auxiliary b contact 12b2 of the switch 2, the first fixed contact _3a7 , and the power supply _P2 from the second fixed contact _3b7 to the b contact _5b3 of the changeover switch 5. Connected to _P2 .

The auxiliary a contact 12a ₃ and the auxiliary b contact 12b ₃ of the sheath breaker 2 are used to send a signal indicating the open/closed state of the sheath breaker 2 to an overall sequence circuit (not shown). The auxiliary a contact 12a ₃ is the first fixed contact 3a ₃ ,
It is connected to external connection terminals 14a ₁ and _14a 2 via 3a ₁₀ or second fixed contacts 3b ₉ and 3b ₁₀ .
A contact 5b ₄ of the changeover switch 5 is provided between the second fixed contact 3b ₉ at the test position and the terminal 14a ₁ . Further, the auxiliary b contact 12b ₃ is the first fixed contact 3a ₁₁ , 3a ₁₂ or the second fixed contact 3b ₁₂ ,
Terminals 14a ₃ , 14a ₄ for external connection via 3b ₁₁
and connect the second fixed contact 3b ₁₁ and the terminal 14a ₃
A contact _5b6 of the changeover switch 5 is provided between the two. Further, a conditional contact 11 which closes only in the connection position with the contact 5a ₃ of the changeover switch 5 is connected in series between the first fixed contact 3a ₁₂ , the second fixed contact 3b ₁₂ and the terminal 14a ₃ . There is. Conditional contact 11 is the ninth
As shown in the figure, the circuit is opened when the shield breaker 2 is in the connected position, and the circuit is closed in other positions.

The changeover switch 5 has the structure shown in FIG. 8. In other words, contacts 5a ₁ , 5a ₂ , and 5a ₃ are closed by switching to the direct operation side (unit test side), and switching to the remote operation side (the side that is switched during normal disconnector opening/closing operations and sequence tests). Accordingly, the contacts 5b ₁ , 5b ₂ , 5b ₃ , 5b ₄ , and 5b ₆ are configured to close.

Next, the effect will be explained. Figure 7 shows the state when the edge and disconnector 2 is in the connected position, and the first fixed contacts 3a are 3a ₁ , 3a ₂ . . . movable contacts 2a ₁ , 2a on the side edge and disconnector 2 ₂ Contact with the side. At this time, the changeover switch 5 is switched to the far side. In this state, the opening/closing operation of the cutter 2 is performed by the closing switch 7c and the tripping switch 7o of the central operation panel 7. That is, by closing the closing switch 7c, the power supplies P ₁ and N 1 are supplied to the closing control circuit on the side of the movable contacts _{2a 3} and _{2a 4 of} the shingle breaker 2 via the first fixed contacts 3a 3 and 3a ₄ .
A voltage of 1 is applied to energize the control relay X, and further, by closing the contact Xa, the closing coil CC is energized to close the breaker 2. When the trip switch 7o is closed, the power supplies P ₂ and N ₂ are connected to the trip circuit on the movable contacts 2a ₅ and _{2a 6} of the shingle breaker 2 via the first fixed contacts 3a ₅ and 3a 6. A voltage is applied, and the tripping coil TC is energized to cause the shear breaker 2 to operate.

Auxiliary contact 12 with the opening/closing operation of the above-mentioned shield breaker 2
a ₁ , 12a ₂ ... and 12b ₁ , 12b ₂ ... also open and close, but the auxiliary contacts 12a ₃ , 12 for signal transmission
b ₃ are fixed contacts 3a ₉ , 3a ₁₀ and 3a ₁₁ , 3a ₁₂
External connection terminals 14a ₁ , 14a ₂ , 14 through
a ₃ and 14a ₄ and added to the entire sequence circuit (not shown).

At this time, even if you mistakenly change the changeover switch 5 to the direct side and operate the closing switch 6c and the tripping switch 6o to perform a unit test on the breaker 2,
This is definitely locked. That is, input switch 6
Since the contact _5b1 is open even when the switch 6o is closed, and the contact _5b2 is open even when the trip switch 6o is closed, the closing or tripping command is not transmitted to the switch 2.

Next, when the breaker 2 is pulled out to the test position, the first
As shown in FIG. 0, each control circuit on the side of the shield breaker 2 contacts the second fixed contacts 3b ₁ , 3b _{2 .} . . .
When performing a unit test at this test position, it is sufficient to switch the changeover switch 5 to the direct operating side and close the on-site make-in switch 6c and trip switch 6o for unit tests.In other words, when the make-in switch 6c is closed, Second fixed contacts 3b ₃ , 3b ₄ via contact 5a ₁
A voltage is applied between them, energizing the closing control circuit on the side of the shield breaker 2, and closing the shield breaker 2. Also, when the trip switch 6o is closed, the _second
A voltage is applied between the fixed contacts 3b ₅ and 3b ₆ to energize the tripping circuit on the side of the insulation breaker 2 and cause the insulation breaker 2 to perform an insulation operation. Furthermore, since this is a single unit test, the contacts 5b ₄ , 5b ₅ , and 5b ₃ are locked so that changes in the signals caused by the auxiliary contacts 12a ₃ and 12b ₃ are not transmitted to the outside.

Next, when a sequence test including an external sequence is to be performed at the test position, the changeover switch 5 is switched to the remote operation side. Then, the opening and closing command to the breaker 2 is performed by the closing switch 7c and the tripping switch 7o on the remote side. Here, unlike the unit test, the sequence test allows the overall movement of the breaker 2 to be grasped, including the opening and closing command operation.

As described above, by switching the changeover switch 5 to the remote operation side, the contacts 5a ₁ , 5a ₂ , and 5a ₃ are opened, and the contacts 5b ₁ , 5b ₂ , 5b ₃ , 5b ₄ , and 5b ₆ are closed. Therefore, by closing the closing switch 7c, the second fixed contacts 3b ₃ , 3 are connected via the contact 5b ₁ .
The voltages of the power supplies P ₁ and N ₁ are applied between B _{and 4} to energize the closing circuit on the side of the shield breaker 2 and turn it on. When the switch 7o is closed, the power supplies P ₂ and N ₂ are applied between the second fixed contacts 3b ₅ and 3b ₆ via the contact 5b ₂ , and the tripping circuit on the breaker 2 side is connected. force it to shut down. At this time, auxiliary contact 12
The open/close state of a ₃ and 12a ₃ is determined by the contacts 5b ₄ and 5b ₅ being closed and the contact 5a ₃ being open.
It is transmitted between 4a ₁ and 14a ₂ and between 14a ₃ and 14a ₄ and is added to an external sequence circuit, so that the operation of the shield breaker 2 can be tested as one of the operations in the entire sequence.

As described above, according to the present invention, it is possible to perform both a single test of a sheath breaker and a sequence test including the entire sequence at the test position by switching the changeover switch. A special position switch is provided, and this position switch is equipped with a special release device.
Compared to a system in which switching operations are performed depending on the type of test, the structure is simpler, the operation is more reliable, and the reliability is improved.

[Brief explanation of the drawing]

Figure 1 is a side view of a conventional closed switchboard;
FIG. 3 is a schematic diagram showing a conventional control circuit disconnection section, FIG. 3 is a circuit diagram showing a conventional disconnection operating circuit, and FIG. 4 is a configuration diagram showing a position switch release mechanism used in the conventional device. Fig. 5 is a side view showing an embodiment of the closed switchboard according to the present invention, and Fig. 6 is a control circuit disconnection section used in the present invention, where a indicates the connection position, b indicates the intermediate position, and c indicates the test position. Figure 7 is a circuit diagram showing the circuit breaker operating circuit in the connection position of the present invention, Figure 8 is a changeover switch, a is a developed view of the contacts, b is a front view, and Figure 9 is a circuit diagram of the present invention. FIG. 10 is a diagram illustrating the opening and closing states of the conditional contacts used at each position. FIG. 10 is a circuit diagram showing the circuit breaker operating circuit at the test position. 1...Closed switchboard, 2...Shiya disconnector, 2a ₁ ~ 2
a ₆ ...Movable contact, 3...Control circuit disconnection section, 3a ₁
〜3a ₁₂ ...first fixed contact, 3b ₁ 〜3b ₁₂ ...
Second fixed contact, 5... changeover switch, 5a ₁ ~
5a ₃ ... switching contact, 5b ₁ to 5b ₆ ... switching contact, 6
c... Closing switch for direct operation, 6o... Tripping switch for direct operation, 7c... Closing switch for remote operation, 7o... Tripping switch for remote operation.

Claims (1)

[Scope of utility model registration request] In a configuration in which the shield breaker 2 is configured to be movable between a connection position connected to the main circuit cross-section of the closed switchboard 1 and a test position opened, the The connected movable contactor 2a,
A fixed contact 3a of the closed switchboard 1 that this movable contact 2a contacts at the connection position, and a fixed contact 3a of the closed switchboard 1 that the movable contact 2a contacts at the connection position
the second fixed contact 3b of the closing switchboard 1 that contacts in the test position; the changeover switch 5 attached to the closing switchboard 1 that switches the disconnector operation circuit between the direct operation side and the remote operation side; A closing switch 6c and a tripping switch 6o for unit testing are connected in series to the operating circuit on the side of the shroud breaker 2 through a second fixed contact 3b, and the contact 5a which closes when the switch 5 is directly operated One contact 5b, which closes when the changeover switch 5 is set to the remote operation side, is connected in series to the second fixed contact 3b, and the other is connected to the first fixed contact 3a without going through the contact 5b, and each closes. A closed power distribution board characterized in that it is equipped with a close switch 7c and a trip switch 7o for remote operation, which respectively apply power to the operation circuits on the side of the disconnector 2 when the switch is closed.