JPH0429288B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to an interlock control method for busbar section switches in which it is possible to systematically determine whether or not the busbar section switch can be opened or closed in an auxiliary busbar system. [Prior art] The auxiliary bus type switching equipment shown in the skeleton diagram of Figure 1 reduces the deployment of electrical equipment such as circuit breakers and disconnectors, and effectively performs uninterruptible power transmission. It has been widely adopted in, etc. This auxiliary bus type switching equipment has 4 circuit breakers each.
An auxiliary bus bar 2 is arranged in parallel to the main bus bar 1 from which a plurality of feeder circuits 3 are led out in parallel, and the load side of the circuit breaker 4 and the auxiliary bus bar 2 in each of the feeder lines 3 are arranged in parallel. An auxiliary bus disconnector 5 is connected between the two. Such switching equipment for auxiliary bus disconnectors is configured such that as demand increases, the busbar section circuit breakers 51 are connected together with the busbar section circuit breakers 41, so that banks C... can be added. [Problems to be Solved by the Invention] Incidentally, the bus bar section disconnector 51 cannot directly switch on or off the load current like a general disconnector. Therefore, when it becomes necessary to operate this auxiliary bus disconnector 51, the same as the busbar section disconnectors 5 in each bank C ₁ , C ₂ .
It is important to be able to operate this in a safe manner at all times. However, in the past, the interlock control of the busbar section disconnector 51 has been performed at the discretion of the operator.
It required skilled workers with a high level of judgment. For this reason, the above-mentioned auxiliary bus type switchgear system systematically determines the operability conditions for the busbar section switch to be operated, and based on the judgment results, the busbar section switch is automatically operated. It was strongly desired to be able to perform lock control. The method of the present invention was developed in view of the above circumstances, and consists of wiring an auxiliary bus bar in parallel to a main bus line from which a plurality of power supply lines each having a line breaker interposed therebetween, and An auxiliary bus disconnector is connected between the load side of the circuit breaker and the auxiliary bus in the line, and the main buses of adjacent banks are connected via a bus segment breaker, and the auxiliary bus is segmented into bus bars. An interlock control method for busbar section disconnectors in auxiliary bus-type switching equipment connected via a disconnector, in which the opening/closing status of the corresponding auxiliary bus disconnector and circuit breaker is determined for each power supply circuit. forming an energizing path in accordance with the opening/closing state of the bus sectional circuit breaker corresponding to the bus sectional circuit breaker to be opened/closed; A combination of an open/closed state of the busbar section circuit breaker and an open/closed state of an auxiliary bus disconnector group and a line breaker group on both sides of the busbar section circuit breaker satisfies a preset operable condition for the busbar section circuit breaker. In this case, a power supply path for the interlock device is formed outside the interlock device using at least a part of the energization path formed for each power supply line, and the interlock device is connected to the interlock device with the power supply path formed. By operating the inspection contacts of the locking device, the power supply is connected to a predetermined energizing path selected from a plurality of energizing paths within the interlock device, including the energizing path formed according to the open/closed state of the bus section circuit breaker. and thereby switching the excitation state of the interlock control relay in the interlock device to release the interlock of the bus section disconnect switch. A method for interlock control of busbar section disconnectors in equipment is provided. [Operation] In the method described above, only when the operable conditions of the busbar section disconnector are satisfied, the power supply path including at least a part of the current carrying path formed for each power supply line is automatically operated. Wired to interlock device. Therefore, if the inspection contact of the interlock device is operated when the operable conditions for the busbar section disconnector are satisfied, for example, voltage is applied to the condition determination relay provided in the interlock device, and the accompanying The excitation state of the interlock control relay can be switched by opening and closing the contacts of the condition determination relay. By switching the excitation state of the interlock control relay, the interlock of the busbar section switch is released. [Examples] Next, the method of the present invention will be described with reference to illustrated examples. First, before explaining the procedure of the method of the present invention, the conditions for releasing the interlock of the bus section disconnector 51 in the auxiliary bus type switchgear shown in FIG. explain. In the auxiliary bus type switching equipment shown in FIG. 1, there are three operating conditions (a) to (c) described below under which the busbar section disconnector 51 does not directly switch or close the load current. The first operable condition (a) is when both ends of the busbar section circuit switch 51 are connected to the same power supply main busbar,
If we consider this in units of left and right banks C ₁ and C ₂ , the fourth
It becomes as shown in figure a. That is, the bus section circuit breaker 41 that connects the banks C ₁ and C ₂ together with the bus section circuit breaker 51 is closed, and the banks on both sides are closed.
This is a case where the line breakers 4', 4' and the auxiliary bus disconnectors 5', 5' are in the closed state in at least one or more power supply lines 3', 3' in each of C ₁ and C ₂ (No. 1a (see table). Next, the second operable condition (b) is that when looking at either the left or right bank (for example, bank C ₁ ) from the busbar section switch 51 to be operated, (i) FIG. Bank on one side of it as shown
(ii) All busbar section disconnectors 5' are open at C ₁ , or (ii) one bank is closed as shown in Figure 4b-2.
In C ₁ , for all of the auxiliary bus disconnectors 5'..., whether the line breakers 4' connected to them are open and whether the feeder line is connected to the auxiliary bus disconnectors 5', (iii) No. 4b −1 bank on one side as shown in Figure 3.
If C ₁ is in a state where the power supply lines shown in Figures 4b-1 and 4b-2 are mixed,
(see Table 1b). The third and final possible operating condition (c) is when there is no voltage on both sides of the busbar section disconnector 51. That is, as shown in FIG. 4c, in both banks C ₁ and C ₂ on the left and right, all lines have their line breakers 4' open and their auxiliary bus disconnectors 5'... (see table 1c).

【table】

【table】

[Table] Next, the interlock device M of the busbar section disconnector 51 used in the system implementing the method of the present invention
Explain. As shown in FIG. 2, this interlock device M includes a test contact 6 that is operated prior to operating the busbar section circuit switch 51, and a test contact that is energized by closing the test contact 6. relay 61
and auxiliary contacts 7 for bus section circuit breakers that are activated in accordance with the opening and closing operations of the corresponding bus section circuit breakers 41.
and a corresponding auxiliary contact 8 for the busbar section disconnector. In addition, this interlock device M has a set of three terminals A, B, C, terminals AA, BB, CC, which individually correspond to the three operable conditions (a) to (c), and the terminals AA, BB, CC.
It is provided with relay terminals B ₁ and B ₂ corresponding to condition (b) and relay terminals C ₁ and C ₂ corresponding to condition (c). The interlock device M also includes a condition determination relay 91a connected to the terminal A via a normally open contact _X1 , and a terminal
A condition determination relay 91 connected to AA via the busbar section breaker auxiliary contact 7 and the normally open contact _X3 .
b, a condition determination relay 92a connected to terminal B via a normally open contact X ₆ , and a condition determination relay 92b connected to terminal BB via a normally open contact X ₁₀ .
, a condition determination relay 93a connected to terminal C via a normally open contact _X14 , and a normally open contact connected to terminal CC.
Condition determination relay 93b connected via _X18
It is equipped with. The above normally open contacts X ₁ , X ₃ ,
X ₆ , X ₁₀ , X ₁₄ , and X ₁₈ are all contacts of the inspection relay 61. Interlock device M also connects power terminals P, N
and power supply relay terminals P ₁ , N ₁ , P ₂ , and N ₂ .
Power terminal P is a normally closed contact of inspection relay 61
It is connected to the relay terminal B ₁ through X ₄ , connected to the relay terminal B ₂ through the normally closed contact X ₁₁ , and connected to the relay terminal C ₁ through the normally closed contact X ₁₃ , which is normally closed. It is connected to the relay terminal _C2 via a contact _X19 . In addition, the power relay terminals P ₁ and N ₁ are connected via the normally closed contact X ₂₀ of the test relay 61, and the power relay terminals P ₂ and N ₂ are connected via the normally closed contact ₂₁ of the test relay 61. connected via. Furthermore, this interlock device M is
The interlock control relay 10 is connected between the power line terminals P and N via a determination unit 11 in which contacts of one or more condition determination relays selected from the condition determination relays 91a are connected in parallel. There is. This interlock control relay 10 releases the interlock of the busbar section disconnector 51 when it is energized. In the determination unit 11, the normally open contacts AL ₁ of the relays 91a and 91b,
AL ₂ is connected in series and relay 93a,
93b is a normally open contact CL ₁ and CL ₂ are connected in series,
These normally open contacts AL ₁ , AL ₂ and normally open contacts CL ₁ ,
CL ₂ , and the normally open contact BL ₁ of relay 92a and the normally open contact BL ₂ of relay 92b are connected in parallel. In the interlock device M constructed as described above, (A) the power is connected to the terminals A and AA and the auxiliary contact 7 for the bus section breaker is closed; (B) the power is connected to the terminal B or the terminal BB. The interlock control relay 10 is energized by pressing the test contact 6 in either of the following states: (C) a state where the power supply is connected to the terminals C and CC; Therefore, when the operable condition (a) is satisfied, the power is connected to terminal A and terminal AA,
When the operable condition (b) is satisfied, the power is connected to terminal B or terminal BB, and the operable condition (b) is satisfied.
By connecting the power to the terminals C and CC when (c) is satisfied, the busbar section circuit switch 51 can be opened and closed in a safe state at all times. Next, the interlock device S shown in FIG. 3, which together with the interlock device M constitutes a system for implementing the method of the present invention, will be explained. This interlock device S is provided corresponding to each auxiliary bus disconnector 5 in each bank. This interlock device S excites the electromagnetic coil 10' by closing the inspection contact 6' when the operating conditions for the auxiliary bus disconnector 5 are satisfied, thereby releasing the interlock of the auxiliary bus disconnector 5. However, here, the interlock device M is mainly activated when any of the operable conditions (a) to (c) of the busbar section switch 51 is satisfied.
Only the structural requirements necessary to form a part of the current-carrying path connected to the terminal A etc. will be explained. This interlock device S includes an auxiliary contact 8' for the corresponding auxiliary bus disconnector 5, a latch relay AX' that is energized when the normally open contact 8'a of this auxiliary contact 8' is closed, and an auxiliary contact 8' Normally closed contact 8
Latch relay energized when b′ is closed
It is equipped with AXR′. This interlock device S also includes an auxiliary contact 7' for the corresponding line breaker 4, a latch relay CX' that is energized when the normally open contact 7'a of this auxiliary contact 7' is closed, and the auxiliary contact 7'. A latch relay CXR' is provided which is energized when the normally closed contact 7'b of ' is closed. Furthermore, this interlock device S has a terminal
P ₀ , N ₀ , P ₀₁ , P ₀₂ , N ₀₁ , N ₀₂ , A ₀ , B ₀₁ , B ₀₂ ,
It is equipped with C ₀₁ and C ₀₂ . Terminals PO ₀₁ and PO ₀₂ are connected via a normally closed contact X' ₁₅ of a testing relay 61' which is energized when the testing contact 6' is closed. Terminals N ₀₁ and N ₀₂ are connected via a normally closed contact X' ₁₆ of a test relay 61'. Between terminals P ₀ and A ₀ is the contact of latch relay AX′
AX' ₁ , the normally closed contact X' ₁ of the inspection relay 61', and the contact CX' ₁ of the latch relay CX'. Between terminals B ₀₁ and B ₀₂ is the contact of latch relay AXR′.
AX' ₄ is connected via the normally closed contact X' ₁₁ of the inspection relay 61'. Between terminals B ₀₁ and B ₀₂ ,
When the terminals are short-circuited, normally closed contact X' ₂ of test relay 61', terminal, terminal, contact CX' ₂ of latch relay CXR', test relay 61'
Normally closed contact X′ ₁₀ , contact of latch relay AX′
AX′ ₃ and the inspection relay 61 are connected via a normally closed contact X ₁₁ . The terminals are short-circuited when the sensor means added to the interlock device S detects that the feed line is not connected to the corresponding auxiliary bus disconnector 5. Terminals C ₀₁ and C ₀₂ are connected via normally closed contact X' ₆ of test relay 61', contact AX' ₃ of latch relay AXR', and normally closed contact X' ₁₄ of test relay 61'. . Also, between terminals ₀₁ and C ₀₂ , when the terminals are short-circuited, normally closed contact X' ₆ of test relay 61', contact AX' ₂ of latch relay AX',
Connections are made via the contact CX' ₃ of the latch relay CXR', the terminal, and the normally closed contact X' ₁₄ of the test relay 61'. The terminals are short-circuited when the sensor means attached to each interlock device S detects that no reverse charging is occurring in any of the feed lines. The interlock device M constructed as described above and the plurality of interlock devices S are connected as shown in FIG. First, power terminals P and N of interlock device M
and the power terminal P ₀ of each interlock device S...
Power lines PI and NI are connected to N ₀ . In addition, the terminal A of the interlock device M and each auxiliary bus disconnector 5 of the left bank _C1 in FIG.
Terminal A ₀ of interlock device S… corresponding to
are connected in parallel by the signal line AI ₁ , and the terminals of the interlock device S corresponding to the terminal A of the interlock device M and each auxiliary bus disconnector 5 of the bank _C2 on the right side in FIG. A ₀ ... are connected in parallel by a signal line AI ₂ . In addition, terminals B and C of the interlock device M are
Signal lines BI ₁ and CI ₁ connect the left bank respectively.
Terminal B ₀₁ of interlock device S at the end of C ₁ ,
Connected to C ₀₁ . On the other hand, terminals BB and CC of interlock device M are connected by signal lines BI ₂ and CI ₂ .
They are respectively connected to the terminals B ₀₂ and C ₀₂ of the interlock device S at the end of the bank C ₂ on the right side. Furthermore, the terminals P ₁ , B ₁ , of the interlock device M
C ₁ and N ₁ are respectively connected to terminals P ₀₂ , B ₀₂ , C ₀₂ and N ₀₂ of the interlock device S at the beginning of the left bank C ₁ . On the other hand, terminals P ₂ , B ₂ , C ₂ , and N ₂ of interlock device M are connected to the right bank.
Terminal P ₀₁ of interlock device S at the beginning of C ₂ ,
They are each individually connected to B ₀₁ , C ₀₁ , and N ₀₁ . The power line PI is connected to the power relay terminal P ₀₁ of the interlock device S at the end of the bank C ₁ on the left, and the power wire PI is connected to the power relay terminal N ₀₂ of the interlock device S at the end of the bank C ₂ on the right. is connected to the power line NI. From the starting interlock device S to the ending interlock device S of bank _C1 on the left,
Terminals P ₀₁ , B ₀₁ , of adjacent interlock devices S
C ₀₁ , N ₀₁ and terminals P ₀₂ , B ₀₂ , C ₀₂ , N ₀₂ are connected for each corresponding terminal. Similarly, the right bank
From the interlock device S at the start end of C ₂ to the interlock device S at the end end, the terminals P ₀₂ , B ₀₂ , C ₀₂ , N ₀₂ of the adjacent interlock device S and the terminals P ₀₁ , B ₀₁ , C ₀₁ , N ₀₁ is connected to each corresponding terminal. By connecting the interlock device M and each interlock device S as described above, the first
An interlock system is constructed to control the interlock of a busbar section switch 51 in the auxiliary busbar type switching equipment shown in the figure. By using such an interlock system, it is possible to determine whether or not the busbar section disconnector 51 shown in FIG. 1 can be operated using the following procedure according to the method of the present invention. That is, at the stage when the inspection contact 6 of the interlock device M is operated, if any of the above-mentioned operable conditions (a) to (c) are satisfied in the above-mentioned auxiliary bus-bar type switching equipment, the following According to this operating principle, the interlock of the busbar section disconnector 51 is released. When the operable condition (a) is satisfied; In this case, as shown in Fig. 4a, the auxiliary bus disconnector 5' is activated in at least one power supply circuit in both the left and right banks C ₁ and C ₂ . and line breaker 4' are both in the closed state. That is, in the interlock device S corresponding to a line in which both the line breaker 4' and the auxiliary bus disconnector 5' are closed, the normally open contact 7'a of the line breaker auxiliary contact 7' closes and , the normally open contact 8'a of the auxiliary bus disconnector auxiliary contact 8' is closed. This results in
The latch relays AX', CX' are energized and their contacts AX' ₁ , CX' ₁ are closed, so that in this interlock device S there are terminals P ₀ → contacts AX' ₁ → contacts X' ₁ → contacts CX' An electric path from ₁ to terminal A ₀ is formed. Since there is an interlock device S in which such an electric path is formed in each bank C ₁ and C ₂ , the signal line AI ₁ or the signal line Power line PI is connected via line AI ₂ . On the other hand, in this operable condition (a), since the bus section circuit breaker 41 is in the closed state, the bus section circuit breaker auxiliary contact 7 of the interlock device M is closed. When the test contact 6 is turned on in the above state, the normally open contacts X ₁ and X ₃ of the test relay 61 close, and the condition determination relay 91a connected between the terminals A and N is connected to the terminals AA and N. A condition determination relay 91b connected therebetween is energized. Therefore, the contacts AL ₁ and AL ₂ of these relays 91a and 91b are closed, and accordingly, the interlock control relay 10 is energized and the interlock of the busbar section disconnector 41 is released. When the operable condition (b) is satisfied; When this condition (b) is satisfied, the bank
The lines corresponding to all interlock devices S in at least one of C ₁ and C ₂ are either (i) auxiliary bus disconnector 5 open, or (ii) line breaker 4 open and feed line 3 Either it doesn't exist or it doesn't exist. As shown in (i) above, in the interlock device S in which the auxiliary bus disconnector 5 of the corresponding line is open, the normally closed contact 8'b of the auxiliary bus disconnector auxiliary contact 8' is closed, and therefore the latch relay
Contact AX′ ₄ of AXR′ is closed. As a result, in this interlock device S, terminal B ₀₁ → contact
An electric path is formed: AX′ ₄ → contact X′ ₁₁ → terminal B ₀₂ . On the other hand, as in (ii) above, in the interlock device S where the circuit breaker 4 of the corresponding line is open,
The normally closed contact 7'b of the circuit breaker auxiliary contact 7' is closed, and therefore the contact of the latch relay CXR'
CX′ ₂ is closed. Furthermore, in this interlock device S, the terminals are short-circuited because the corresponding line is not equipped with a power supply line. As a result, there is a terminal in this interlock device S.
B ₀₁ → Contact X′ ₂ → Terminal → Terminal → Contact CX′ ₂ →
An electric path is formed: contact X′ ₁₀ → contact AX′ ₃ → contact X′ ₁₁ → terminal B ₀₂ . As described above, in both cases (i) and (ii) above, terminal B ₀₁ → terminal
An electric path B ₀₂ is formed. That is, the fourth
In a state corresponding to any of Figure b-1, Figure 4b-2, and Figure 4b-3, the electrical circuit from terminal B ₀₁ to terminal B ₀₂ is disconnected in all interlock devices S corresponding to the line of bank C ₁ . It is formed. Therefore, an electric path is formed from the terminal _B02 of the interlock device S at the beginning of bank _C1 to the terminal _B01 of the interlock device S at the end. When the test contact 6 is turned on in the above state, the test relay 61 is energized and its normally open contacts X ₄ and X ₆ are closed, so that the power terminal _P → contact →Terminal
An electric path from B ₁ and an electric path from terminal B to contact X ₆ to condition determination relay 92a to terminal N are formed. As a result, power line PI → power terminal P of interlock device M → terminal B ₁ → terminal B ₀₂ of interlock device S at the beginning → terminal B ₀₁ of interlock device S at the end → signal line BI ₁ → Terminal B of interlock device M→condition determination relay 92a→
An electric path for terminal N is formed, and condition determination relay 92
a is excited. Accordingly, the contacts _BL1 of these relays 92a are closed, and accordingly the interlock control relay 10 is energized and the interlock of the busbar section disconnector 41 is released. Although not explained in detail here, even when the bank C ₂ side on the right side in FIG. ₁ satisfies the above operation enable condition (b), the terminals B ₀₁ , It is clear that the power line PI is connected to the terminal BB of the interlock device M via _B02 . Therefore, when the test contact 6 is turned on in this state, the condition determination relay 92b is energized, and the contact BL ₂ of these relays 92b is closed.
The interlock control relay 10 is energized to release the interlock of the busbar section disconnector 41. When the operable condition (c) is satisfied; When this condition (c) is satisfied, the bank
Whether the lines corresponding to all interlock devices S in both C ₁ and C ₂ are (iii) line breaker 4 open and auxiliary bus disconnector 5 closed, (iv)
The auxiliary bus disconnector 5 is either open or not. As described in (iii) above, in the interlock device S in which the line breaker 4 of the corresponding line is open and the auxiliary bus disconnector 5 is closed, the normally closed contact 7'b of the line breaker auxiliary contact 7' is closed, and the normally open contact 8'a of the auxiliary bus disconnector auxiliary contact 8' is closed. And by this,
Contact CX' ₃ of latch relay CXR' is closed, and contact AX' ₂ of latch relay AX' is closed. Also,
If there is no reverse charging on any of the feed lines, the terminals of each interlock device S are shorted. As a result, in this interlock device S, terminal C ₀₁ → contact X' ₆ → contact AX' ₂ → contact CX' ₃
→Terminal→Terminal→Contact X′ ₁₄ →Terminal C ₀₂ An electric path is formed. On the other hand, as shown in (iv) above, in the interlock device S in which the auxiliary bus disconnector 5 of the corresponding line is open, the normally closed contact 8'b of the line breaker auxiliary contact 8' is closed, so latch relay
Contact AX′ ₃ of AXR′ is closed. As a result, in this interlock device S, terminal C ₀₁ → contact
An electric path is formed: X′ ₆ → contact AX′ ₃ → contact X′ ₁₄ → terminal C ₀₂ . As described above, in both cases (iii) and (iv) above, the terminal C ₀₁ → terminal
A C ₀₂ electrical path is formed. That is, the fourth
In the state shown in Figure c, the terminals are connected to the interlock device S corresponding to all lines of banks C ₁ and C ₂ .
An electric path from C ₀₁ to terminal C ₀₂ is formed. When the test contact 6 of the interlock device M is turned on in the above state, the test relay 61
are energized and their normally open contacts X ₁₀ , X ₁₄ , X ₁₉ ,
X ₁₈ is closed, and in the interlock device M, power terminal P → contact X ₁₀ → terminal C ₁ electrical circuit and end terminal C →
Contact X ₁₄ → Condition judgment relay 93a → Electrical path of terminal N and power terminal P → Contact X ₁₉ → Electrical path of terminal C ₂ and terminal C → Contact X ₁₈ → Condition judgment relay 93b
→An electric path for terminal N is formed. By this,
Corresponding to bank C ₁ on the left, power line PI → power terminal P of interlock device M → same terminal
C ₁ →Starting end interlock device S terminal C ₀₂ →
An electric path is formed from terminal C ₀₁ of interlock device S at the end → signal line CI ₁ → terminal C of interlock device M → condition determination relay 93a → terminal N,
Condition determination relay 93a is energized. Also, corresponding to bank C ₁ on the right side, power line PI → power terminal P of interlock device M → terminal C ₂
→Terminal C ₀₁ of interlock device S at the start end →Terminal C ₀₂ of interlock device S at the end →Signal line
An electric path is formed from CI ₂ to terminal CC of interlock device M to condition determination relay 93b to terminal N, and condition determination relay 93b is energized. As described above, the contacts of condition determination relays 93a and 93b are
Both CL ₁ and CL ₂ are closed, and accordingly, the interlock control relay 10 is energized and the interlock of the busbar section disconnector 41 is released. When the interlock control is performed as described above, only when the test contact 6 of the interlock device M is operated when the operable conditions (a) to (c) above are satisfied, the busbar section disconnector 51 is activated. The interlock is released and the busbar section switch 51 can be opened and closed. [Effect of the invention] If the inspection contact of the interlock device is operated before operating the busbar section disconnector, the interlock will be released only when the operable conditions are satisfied, so this busbar section disconnector can be operated. This has the effect that the container can always be opened and closed in a safe state. In addition, since it is automatically determined whether the operable conditions for the busbar section switch are met, safety can be ensured without the need for skilled workers. Also plays.

[Brief explanation of drawings]

Fig. 1 is a skeleton diagram showing an example of an auxiliary bus type switchgear to which the method of the present invention is applied, Fig. 2 is a diagram showing the detailed configuration of an interlock device for a busbar section disconnector, and Fig. 3 is a diagram showing an auxiliary busbar disconnector. FIG. 4a is a diagram schematically showing the first operable condition of the same as above, and FIG. 4b-1 is a diagram showing the detailed configuration of the interlock device.
The figure is a diagram schematically showing a first example under the second operable condition as above, and FIG. 4b-2 is a diagram schematically showing a second example under the second operable condition as above. Fig. 4b-3 is a diagram schematically showing a third example of the second operable condition as described above, Fig. 4c is a diagram schematically showing the third operable condition as above, and Fig. 5 1 is a schematic diagram of an interlock system implementing the method of the present invention; FIG. A... Interlock device for busbar section switch,
1...Main bus, 2...Auxiliary bus, 3...Power supply line, 4...Line breaker, 5...Auxiliary bus disconnector,
6...Contact for inspection, 10...Interlock control relay.

Claims (1)

[Scope of Claims] 1. An auxiliary bus bar is wired in parallel to a main bus line from which a plurality of power supply lines each having a line breaker interposed therebetween are led out in parallel, and a load side of the line breaker in each of the power supply lines is connected to the main bus line. Auxiliary busbars each having an auxiliary bus disconnector connected between the auxiliary busbars, and connecting the main buses of adjacent banks via the busbar section breakers and connecting the auxiliary buses via the busbar section breakers. An interlock control method for busbar section disconnectors in busbar-type switchgear equipment, in which an energized path is formed for each power supply line according to the opening/closing state of the corresponding auxiliary busbar disconnector and circuit breaker, An energizing path is formed in the interlock device of the bus section circuit breaker corresponding to the bus section circuit breaker to be opened/closed, depending on the open/close state of the bus section circuit breaker corresponding to the bus section circuit breaker to be opened/closed. When the combination of the open/closed states of the auxiliary bus disconnector group and the line breaker group on both sides of the busbar section disconnector satisfies a preset operable condition for the busbar section disconnector, a circuit breaker is formed for at least each power supply line. A power supply path for the interlock device is formed outside the interlock device using a part of the energization path, and a test contact of the interlock device is operated while this power supply path is formed. Then, a power supply is connected to a predetermined energizing path selected from a plurality of energizing paths in the interlock device, including energizing paths formed according to the open/closed states of the bus section circuit breakers. 1. An interlock control method for a busbar section switch in an auxiliary bus type switching equipment, characterized by: switching the excitation state of an interlock control relay in the busbar section to release the interlock of the busbar section switch.