JPH0429289B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to an interlock device for a busbar section switch which can be suitably used to systematically determine whether or not the busbar section switch can be opened/closed in an auxiliary busbar system. [Prior Art] The auxiliary bus type switching equipment as 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.
Widely used in substations, etc. In this auxiliary bus type switching equipment, an auxiliary bus 2 is arranged in parallel to a main bus 1 from which a plurality of power supply circuits 3 each having a line breaker 4 interposed therebetween are drawn out in parallel, and each of the power supply circuits 3 An auxiliary bus disconnector 5 is connected between the load side of the line breaker 4 and the auxiliary bus 2 in... In such an auxiliary bus type switchgear system, banks can be expanded by connecting the bus section circuit breaker 51 together with the bus section circuit breaker 41 as demand increases. [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 busbar section disconnector 51, the same as the auxiliary busbar 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 was actually performed based on the judgment of the operator, and required a skilled operator with a high degree of judgment. For this reason, the conditions of whether or not the busbar section switch 51 to be operated can be operated are systematically judged in the above-mentioned auxiliary busbar type switching equipment, and based on the judgment result, the busbar section switch 51 is
1. It has been strongly desired to be able to automatically control interlock. [Means for Solving the Problems] The present invention has been made in view of the above circumstances, and provides an auxiliary bus for a main bus from which a plurality of power supply lines each having a circuit breaker interposed therein are led out in parallel. A busbar section disconnector that is wired in parallel and has an auxiliary bus disconnector connected between the load side of the circuit breaker in each of the power supply lines and the auxiliary busbar, and that connects each bank, and this busbar section. An interlock device for a busbar section disconnector attached to an auxiliary bus type switchgear equipped with a busbar section circuit breaker connecting each bank in correspondence with the disconnector, the interlock device for interlocking the busbar section circuit breaker for connecting each bank. Inspection contacts that are operated to check whether or not the bus segment circuit breaker is open or closed; Auxiliary contacts for the bus segment circuit breaker that are opened and closed in response to the opening/closing operations of the bus segment circuit breaker; a plurality of condition determination relays connected to these input terminals through contacts that are closed by operating at least the inspection contact; and a plurality of condition determination relays that correspond to each of the operable conditions. An interlock control relay that controls the excitation state of a coil as a predetermined condition determination relay is energized; An interlock device is provided. [Function] According to the device of the present invention as described above, when any of the operable conditions for a plurality of busbar section circuit switches is satisfied, any one of the input terminals of the interlock device is activated by the signal line corresponding to each condition. By making it possible to connect a power line to the terminal, when the test contact is operated with the operable condition satisfied, a predetermined condition determination relay corresponding to the operable condition is energized, and the interface is activated accordingly. The energization state of the lock control relay is controlled. [Example] Below, the device of the present invention will be explained together with a method for interlock control of a busbar section switch in an auxiliary bus type switchgear equipment using this device. First, conditions for releasing the interlock of the busbar section disconnector 51 in the auxiliary busbar system switchgear shown in FIG. 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
C ₁ , all the auxiliary busbar disconnectors 5' are in the open state, or (ii) one bank is closed as shown in Figure 4b-2.
In C ₁ , for all of the auxiliary bus disconnectors 5'..., check whether the line breakers 4' connected to them are open and no feeder line is connected to the auxiliary bus disconnectors 5', and (iii ) One side bank as shown in Figure 4b-3.
This is a case where _C1 is in a state in which the power supply lines shown in FIG. 4b-1 and FIG. 4b-2 are mixed (see Table 1b). The third and final operable 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 according to the present invention will be explained. 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. Moreover, 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 condition ( 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). In addition, the interlock device M has a normally open contact X ₁ at the terminal A.
a condition determination relay 91a that is connected to the terminal AA through the bus section breaker auxiliary contact 7 and the normally open contact _X3 .
1b, a condition determination relay 92a connected to terminal B via a normally open contact X ₆ , and a condition determination relay 92 connected to terminal BB via a normally open contact X ₁₀ .
b, a condition determination relay 93a connected to terminal C via a normally open contact _X14 , and a condition determination relay 93b connected to terminal CC via a normally open contact _X18 .
That's what we have in place. 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 of relays 91a and 91b
AL ₁ and AL ₂ are connected in series and relay 9
3a and 93b are connected in series with normally open contacts CL ₁ and CL ₂ , and these normally open contacts AL ₁ and AL ₂ , normally open contacts CL ₁ and CL ₂ , and the normally open contact of relay 92a.
BL ₁ 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, a configuration for connecting a power source to the terminals A, AA, etc. of the interlock device M in accordance with the conditions when the above-mentioned operable conditions (a) to (c) are satisfied will be explained. FIG. 3 shows an interlock device S for auxiliary bus disconnectors 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, in this case, the connection is mainly made to the terminal A of the interlock device M when any of the operable conditions (a) to (c) of the busbar section disconnector 51 is satisfied. The structural requirements necessary to form a part of the current-carrying path 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 8a' of this auxiliary contact 8' is closed, and a latch relay AX' for the 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 7a' of this auxiliary contact 7' is closed, and an auxiliary contact 7'. It is equipped with a latch relay CXR' which is energized when the normally closed contact 7b' 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 normally closed contact of the inspection relay 61′ X′ ₁₁
are connected via. 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',
The terminals are connected via the contact CX' ₃ of the latch relay CXR', the terminal, and the normally closed contact X' ₁₄ of the inspection 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 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, the terminals P ₂ , B ₂ , C ₂ , N ₂ of the interlock device M are the terminals P ₀₁ , B ₀₁ , C ₀₁ , of the interlock device S at the starting end of the bank C ₂ on the right side.
Each is individually connected to 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. That is, at the stage when the inspection contact 6 of the interlock device M is operated,
If any of the operable conditions (a) to (c) described above are satisfied in the above-mentioned auxiliary busbar type switching equipment,
The interlock of the busbar section disconnector 51 is released according to the following operating principle. 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 these contacts AX ₁ ', CX ₁ ' are closed, so that in this interlock device S there are terminals P ₀ → contact AX ₁ ' → contact X ₁ ' → contact 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 the 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 feeder 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 one 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 supply terminal P → contact X ₄ is connected in the interlock device M. →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 to release the interlock of the busbar section disconnector 41. Although not explained in detail here, even if the bank C ₂ on the right side in FIG. ₁ satisfies the operable condition (b) above, 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 the 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. As described above, when the interlock device M is used to perform interlock control of the busbar section switch 51, the operable conditions (a) to (c) are met.
By operating the test contact 6 when the above conditions are satisfied, the interlock of the busbar section disconnector 51 can be released and the busbar section disconnector 51 can be operated. [Effects of the Invention] As is clear from the above explanation, according to the interlock device for the busbar section disconnector in the auxiliary busbar type switchgear equipment according to the present invention, the test contacts can be connected before operating the busbar section disconnector. By operating this, it becomes possible to release the interlock on the busbar section switch only when the busbar section switch can be operated. Therefore, it is possible to open and close the busbar section switch in a safe state without requiring a skilled worker.

[Brief explanation of drawings]

Fig. 1 is a skeleton diagram showing an example of switching equipment of the auxiliary busbar type, Fig. 2 is a diagram showing the detailed configuration of the interlock device for the busbar section disconnector according to the present invention, and Fig. 3 is a diagram showing the interlock device for the auxiliary busbar disconnector. A diagram showing the detailed configuration of the device, FIG. 4a is a diagram schematically showing the first operable condition of the same as above, and FIG. 4b-1 is a diagram schematically showing the first example of the second operable condition of the same as above. Figure 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 example of the same as the above-mentioned operable condition, and Fig. 5
The figure is an explanatory diagram of the usage state of the interlock device for the busbar section disconnector according to the present invention. 1...Main bus, 2...Auxiliary bus, 3...Power supply line, 4...Line breaker, 5...Auxiliary bus disconnector,
6... Inspection contact, 7... Auxiliary contact for bus bar section breaker, 10... Interlock control relay, 41
... bus section circuit breaker, 51 ... bus section circuit breaker,
91a-93b...Condition judgment relay, A, B,
C, AA, BB, CC, B ₁ , C ₁ , B ₂ , C ₂ ...terminals.

Claims (1)

[Scope of Claims] 1. An auxiliary bus bar is arranged 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 provided. auxiliary bus disconnectors are connected between the and the auxiliary busbars, and a busbar division disconnector is connected between each bank, and a busbar division circuit breaker is connected between each bank corresponding to the busbar division disconnector. An interlock device for the busbar section circuit breaker attached to the auxiliary busbar type switchgear equipped with the busbar section circuit breaker, comprising: an inspection contact that is operated to determine whether or not the corresponding busbar section circuit breaker is operable; and the busbar section breaker. auxiliary contacts for the bus section circuit breaker that are opened and closed in response to the opening and closing operations of the bus section circuit breaker, a plurality of input terminals provided corresponding to each preset operable condition of the bus section circuit breaker, and these input terminals, A plurality of condition determination relays are connected through contacts that are closed by operating at least the test contact, and a coil is activated as a predetermined condition determination relay corresponding to each of the operable conditions is energized. An interlock device for a busbar separation switch in an auxiliary busbar type switchgear equipment, comprising: an interlock control relay whose excitation state is controlled;