KR100896345B1 - Interlock device for switchgear breaker - Google Patents

Abstract

The present invention relates to an interlock device of a switchgear breaker, which provides an interlock structure to an emergency generator that is operated in place of a transformer during a power failure while preventing a short circuit caused by the simultaneous power supply of secondary transformers of three transformers. It is to. To this end, the present invention, the load group (L1, L2, L3) is connected through the ACB (A, D, G) connected to the secondary side of the transformer (TR1, TR2, TR3), transformer (TR1, TR2, TR3) An ACB interlock device having tie ACBs (C, F) provided therebetween, one side of which is connected to the emergency generator 10 in case no voltage is supplied from the transformers TR1, TR2, TR3, and the ACB (A). And an emergency generator ACB 20 interposed between the tie ACB (C) and the ACB (D) and the tie ACB (F) and the emergency generator 10 and the ACB (G); The secondary voltages of the transformers T1, T2, and T3 are prevented from entering the tie ACBs C and F at the same time, and the voltage is not supplied from all the transformers T1, T2, and T3. Interlock control unit for controlling logic of emergency generator ACB 20 to receive voltage from emergency generator 10 when at least one of D, G or tie ACB (C, F) does not operate due to an error ( 30); characterized in that, to prevent the two power supply to the load group at the same time and to control the power supply from the emergency generator.

Switchgear, Interlock, Transformer, Emergency Generator, DIP Switch

Description

Interlock device for switchgear breaker {INTERLOCK APPARATUS OF DISTRIBUTING BOARD CIRCUIT BREAKER}

The present invention relates to an interlock device of a switchgear breaker, and more particularly to an interlock device of a switchgear breaker for controlling an interlock device for preventing a short circuit of power input from a switchgear transformer through a logic circuit. It is about.

In general, switchboards are installed in power plants, substations, or buildings with electrical facilities, and include transformers, instruments, indicators, relays, and switches to facilitate the opening and closing of converters and the control and monitoring of devices. In this switchboard, the ACB (Air Circuit Breaker) is installed on the secondary side of the transformer, which protects the low-voltage line, short-circuit current cutoff, ground fault current cutoff, and overload current undervoltage cutoff. And transformer protection.

However, in a switchboard using a conventional ACB, a tie ACB is connected between transformer ACBs to prevent voltage from being applied from both transformers at the same time. As a result of connecting the tie ACB in a state where voltage is applied from both transformers, a short circuit accident may occur.

In Patent No. 10-0745621, in order to solve the above problem, when the UVT (Undervoltage Trip Device) is installed in the ACB and the tie ACB for the transformer, the power is not supplied or supplied through both transformers with the UVT of the tie ACB. An analog interlock structure is adopted to supply the operating power to the UVT when the power is supplied from only one side without supplying the operating power to the UVT.

However, the above-mentioned patent does not describe the connection relationship between a transformer ACB or a tie ACB, whose control object is limited to a tie ACB, and is substantially associated with an ACB of an emergency generator used in a switchboard. Through the actual wiring is a complicated problem.

The present invention has been made to solve the problems of the prior art, a switchgear breaker for preventing the short circuit accident that can occur when the power supply to both sides of the transformer at the same time by controlling each ACB by a digital logic circuit Its purpose is to provide an interlock device.

In addition, it provides an interlock device of a switchgear breaker that can provide convenience in actual wiring by controlling the ACB for a transformer that interworks with the emergency generator ACB of the switchboard and the tie ACB connected therebetween through a single chip such as a microprocessor. Its purpose is to.

In addition, it is an object of the present invention to provide an interlock device of a switchgear breaker in which two or three transformers are used and an emergency generator can be selected.

In order to achieve the above object, in the present invention, the first to third load groups are electrically connected to the first to third transformer secondary side through the first to third ACB (Air Circuit Breaker) connected to each of them; And an ACB interlock device for a distribution board, in which first and second tie ACBs are respectively installed between the first and third transformers, in case an emergency voltage is not supplied from the first to third transformers. One side is connected to the generator, the first emergency generator ACB interposed between the first ACB and the first tie ACB and the second emergency generator ACB interposed between the second ACB and the second tie ACB and the emergency generator And an emergency generator ACB comprised of a third emergency generator ACB interposed between the third ACBs. When the secondary voltages of the first to third transformers are prevented from being simultaneously introduced into the first or second tie ACBs, and voltages are not supplied from both of the first to third transformers, or the first to third voltages. An interlock for logic control of one or more of the first to third emergency generator ACBs so that a voltage is applied from the emergency generator when one or more of the three ACBs or the first or second tie ACBs do not operate due to an error. And a control unit.

The interlock control unit may include an AC-DC converter for receiving an AC voltage generated at the secondary side of the first to third transformers and converting it into a DC voltage for power, and the first to third ACBs, the first and second tie ACBs. And an input unit for receiving an on or off state of the first to third emergency generator ACBs, a logic processing unit for processing a signal input to the input unit, and the first to the third signal according to a signal determined through the logic processing unit. An output unit for outputting a signal for controlling 3 ACBs, first and second tie ACBs, and ACBs for first to third emergency generators; and first to third ACBs and first to third outputs according to output signals of the logic processing unit And a display unit for displaying an on or off state of the second tie ACB and the first to third emergency generator ACBs.

In addition, the logic processing unit (B'C ') + (B'D'E') = A, (A'C ') + (A'D'E') = B, (A'B'F ') + (D'E'F ') = C, (C'E'F') + (C'E'G'H ') + (A'B'E'F') = D, (D'C'F ') + (D'A'B'F') + (D'C'G'H ') = E, (C'D'E') + (C'G'H ') = F, (H' F ') + (H'D'E') = G, (G'F ') + (G'D'E') = configured according to logic condition according to H, or B '(C' + D'E ') = A, A' (C '+ D'E') = B, F '(A'B' + (D'E ') = C, E' (C'F '+ C'G'H' + A'B'F ') = D, D' (C'F '+ A'B'F' + C'G'H ') = E, C' (D'E '+ G'H') = F, H '(F' + D'E ') = G, G' (F '+ D'E') = H (where A to F are the first to third ACBs, the first and second tie ACBs) And a contact state of the first to third emergency generator ACBs, and A 'to F' indicate a contact state b).

Additionally, the interlock control unit may further include a logic setting unit for individually controlling operations of the first to third ACBs, the first and second tie ACBs, and the first to third emergency generator ACBs.

As described above, the interlock device of the switchgear breaker according to the present invention controls the first to third ACB and the first and second tie ACBs through the interlock control unit to simultaneously supply power to both sides of the first to third transformers. Prevents accidents caused by being put into one ACB and controls the emergency generator ACB to safely supply voltage to the first to third load groups when no voltage is supplied from the first to third transformers, such as during a power outage. Can supply

In addition, through the interlock control unit consisting of the emergency generator ACB, the first to third ACB, and the first and second tie ACB of the switchboard by a logic circuit, the control unit is configured to maintain a contact or b contact state according to a predetermined condition. The wiring relationship for the interlock can be simplified.

In addition, based on the use of three transformers, the use of two transformers and the use of emergency generators can be determined by selectively adopting the logic setting unit.

Hereinafter, an interlock device of a switchgear breaker according to the present invention will be described with reference to the drawings.

1 is a connection diagram of an interlock device of a switchgear breaker according to the present invention, and FIG. 2 is a block diagram illustrating an interlock control unit among interlock devices of a switchgear breaker according to the present invention.

The interlock device of the circuit breaker for a switchboard according to the present invention is basically provided through first to third ACBs (A, D, and G) connected to the secondary sides of the first to third transformers TR1, TR2, and TR3. The first to third load groups (L1, L2, L3) are electrically connected and the first and second tie ACB (C, F) is installed between the first to third transformer (TR1, TR2, TR3), respectively An ACB interlock device for a switchboard, comprising: an emergency generator ACB 20 interposed between first to third ACBs A, D, and G, and first to third ACBs A, D, and G; And an interlock control unit 30 for controlling the second tie ACBs C and F and the emergency generator ACB 20 according to logic.

When the emergency generator ACB 20 is not supplied with voltage from the first to third transformers TR1, TR2, and TR3, for example, one side of the emergency generator ACB 20 is connected to the emergency generator 10 in case of a power failure. In the first ACB (A) in parallel to the first tie ACB (C), the first emergency generator ACB (B) connected in series, and the second ACB (D) in parallel to the second tie ACB (F ) Is composed of a second emergency generator ACB (E) connected in series and a third emergency generator ACB (H) connected in parallel to the third ACB (G) and connected to the third load group (L3). At least one of the first to third emergency generator ACBs (B, E, H) is controlled according to the signal of the interlock control unit 30.

The interlock controller 30 may convert AC 220V AC generated at the secondary side of the first to third transformers TR1, TR2, and TR3 into DC voltages for power used in digital circuits such as 24V, 12V, and 5V. DC converter 31, first to third ACBs (A, D, G), first and second tie ACBs (C, F) and ACBs for first to third emergency generators (B, E, H); ), The first through the first through the input unit 32 for receiving the on or off state of the), the logic processing unit 33 for processing the signal input to the input unit 32, and the signal determined by the logic processing unit 33 3 Output unit for outputting signals for controlling ACB (A, D, G), first and second tie ACBs (C, F) and ACBs (B, E, H) for first to third emergency generators ( 34) and the first to third ACBs (A, D and G), the first and second tie ACBs (C and F) and the first to third emergency generator ACBs according to the output signal of the logic processor 33. And a display unit 35 for displaying the on or off state of (B, E, H). Through this structure, the interlock controller 30 prevents the secondary voltages of the first to third transformers T1, T2, and T3 from being simultaneously introduced into the first or second tie ACBs C and F. More specifically, the secondary voltages of the first and second transformers T1 and T2 are simultaneously input to the first tie ACB C or the secondary voltages of the second and third transformers T2 and T3 are simultaneously applied. It has a function of preventing the input into the two tie ACB (F), and when no voltage is supplied from all of the first to third transformers T1, T2, and T3, that is, in case of power failure or the first to third times. At least one of the ACBs (A, D, G) or for the first to third emergency generators to receive a voltage from the emergency generator 10 when the first or second tie ACBs (C, F) do not operate correctly. Logic controls one or more of the ACBs (B, E, H).

On the other hand, looking at the logic conditions of the logic processor 33, the first ACB (A) is the first emergency generator ACB (B) and the first tie ACB (C) is off or the first emergency generator ACB ( B), used when the second ACB (D) and the second emergency generator ACB (E) are off, and the first emergency generator ACB (B) is the first ACB (A) and the first tie ACB (C). Is used when the first ACB (A), the second ACB (D) and the second emergency generator ACB (E) are off, and the first tie ACB (C) is the second tie ACB (F). When the first ACB (A) and the first emergency generator ACB (B) are off or when the second tie ACB (F), the second ACB (D) and the second emergency generator ACB (E) are off. The second ACB (D) is used when the second emergency generator ACB (E), the first tie ACB (C) and the second tie ACB (F) are off or the second emergency generator ACB (E), When the first tie ACB (C), the third ACB (G) and the third emergency generator ACB (H) are off or the second emergency generator ACB (E), the first ACB, the first emergency generator Used when the primary ACB (B), the second tie ACB (F) is off, the second emergency generator ACB (E) is the second ACB (D), the first tie ACB (C) and the second tie ACB ( F) is off or the second ACB (D), the first ACB, the first emergency generator ACB (B) and the second tie ACB (F) are off or the second ACB (D), the first tie Used when the ACB (C), the third ACB (G) and the third emergency generator ACB (H) are off, and the second tie ACB (F) is the first tie ACB (C) and the second ACB (D) And when the second emergency generator ACB (E) is off or when the first tie ACB (C), the third ACB (G) and the third emergency generator ACB (H) are off, and the third ACB ( G) indicates that the third emergency generator ACB (H) and the second tie ACB (F) are off or the third emergency generator ACB (H), the second ACB (D) and the second emergency generator ACB (E). ) Is used when the third emergency generator ACB (H) is off, or when the third ACB (G) and the second tie ACB (F) are off or the third ACB (G), the second ACB (D). ) And the second emergency generator ACB (E) It is used when peuin.

3 is a block diagram of a logic processing unit according to a first embodiment of an interlock device of a switchgear breaker according to the present invention.

If the above logic condition is expressed as a logic function, (B'C ') + (B'D'E') = A, (A'C ') + (A'D'E') = B, (A'B 'F') + (D'E'F ') = C, (C'E'F') + (C'E'G'H ') + (A'B'E'F') = D, ( D'C'F ') + (D'A'B'F') + (D'C'G'H ') = E, (C'D'E') + (C'G'H ') = F, (H'F ') + (H'D'E') = G, (G'F ') + (G'D'E') = H, and the logic circuit for this is shown in FIG. . Where A to H are the first to the third ACB (A, D, G), the first and second tie ACB (C, F) and the first to third emergency generator ACB (B, E, H) The contact state is shown, and A 'to H' represent an off state (b contact state).

4 is a configuration diagram of a logic processing unit according to a second embodiment of an interlock device of a switchgear breaker according to the present invention.

In addition, according to the Boolean algebraic law, B '(C' + D'E ') = A, A' (C '+ D'E') = B, F '(A'B' + D'E ') = C, E' (C'F '+ C'G'H' + A'B'F ') = D, D' (C'F '+ A'B'F' + C ' G'H ') = E, C' (D'E '+ G'H') = F, H '(F' + D'E ') = G, G' (F '+ D'E') = It can be represented by H, the logic circuit for this is shown in FIG.

Additionally, the interlock control unit 30 includes the first to third ACBs (A, D, and G), the first and second tie ACBs (C and F), and the first and third emergency generator ACBs (B and E). , H) further includes a logic setting unit 36 for controlling the operation of H), for example, only the logic condition for controlling the ACB is deleted as the corresponding ACB is turned off. For example, when the third ACB (G) and the third emergency generator ACB (H) are turned off through the logic setting unit 36, the conditions of the corresponding ACB are ignored in the above-described logic condition.

Referring to the wiring for the actual use of the interlock device of the switchgear breaker according to the present invention with reference to Figure 1, when the state of each ACB meets a specific logic condition, the interlock control unit 30 of DO1 to DO8 A contact signal is output to one or more to connect a specific ACB corresponding to the ACBs of CB1 to CB8.

The interlock device of the switchgear breaker according to the present invention includes first to third ACBs (A, D, and G), first and second tie ACBs (C and F), and first and third emergency generator ACBs (B). , E, H) may be used to control each, but also may be used as an interlock means for controlling the UVT of Patent No. 10-0745621 introduced in the background of the present specification.

1 is a connection diagram of the interlock device of the switchgear breaker according to the present invention.

Figure 2 is a block diagram showing an interlock control unit of the interlock device of the breaker for switchboard according to the present invention.

3 is a configuration diagram of a logic processing unit according to a first embodiment of an interlock device of a switchgear breaker according to the present invention;

Figure 4 is a block diagram of a logic processing unit according to a second embodiment of the interlock device of the switchgear breaker according to the present invention.

Claims (5)

On the secondary side of the first to third transformers TR1, TR2, and TR3, the first to third load groups L1 are connected through first to third ACBs (A, D, and G) connected to each of them. , L2 and L3 are electrically connected to each other, and the first and second transformers TR1, TR2, and TR3 are installed between the first and second tie ACBs C and F, respectively. In the lock device, One side is connected to the emergency generator 10 in case the voltage is not supplied from the first to third transformers TR1, TR2, TR3, and the first ACB (A) and the first tie ACB (C). The first emergency generator ACB (B) interposed therebetween and the second emergency generator ACB (E) and the emergency generator 10 interposed between the second ACB (D) and the second tie ACB (F); An emergency generator ACB 20 composed of a third emergency generator ACB (H) interposed between the third ACBs (G); The secondary voltages of the first to third transformers T1, T2, and T3 are prevented from being simultaneously introduced into the first or second tie ACBs C and F, and the first to third transformers T1, When no voltage is supplied from both T2 and T3 or one or more of the first to third ACBs (A, D, G) or the first or second tie ACBs (C, F) do not operate due to an abnormality. If not, the interlock control unit 30 for logic control of one or more of the first to third emergency generator ACB (B, E, H) to receive a voltage from the emergency generator 10; An interlock device for a switchgear breaker. The method according to claim 1, The interlock control unit 30 receives an AC voltage generated at the secondary side of the first to third transformers TR1, TR2, and TR3 and converts the AC-DC converter 31 into a DC voltage for power. Receiving the on or off state of the 1st to 3rd ACBs (A, D, G), the 1st and 2nd tie ACBs (C, F) and the 1st to 3rd emergency generator ACBs (B, E, H) The first to third ACBs (A and D) according to an input unit 32 for receiving a signal, a logic processor 33 for processing a signal input to the input unit 32, and a signal determined by the logic processor 33. And G), an output unit 34 for outputting signals for controlling the first and second tie ACBs (C, F) and the first to third emergency generator ACBs (B, E, H), and the logic The first to third ACBs (A, D and G), the first and second tie ACBs (C and F) and the first and third emergency generator ACBs (B and E) according to the output signal of the processor 33. Consisting of a display portion 35 for displaying the on or off state of H) An interlock device for a circuit breaker switchgear according to claim. The method according to claim 2, The logic processor 33, (B'C ') + (B'D'E') = A, (A'C ') + (A'D'E') = B, (A'B'F ') + (D'E' F ') = C, (C'E'F') + (C'E'G'H ') + (A'B'E'F') = D, (D'C'F ') + (D 'A'B'F') + (D'C'G'H ') = E, (C'D'E') + (C'G'H ') = F, (H'F') + ( H'D'E ') = G, (G'F') + (G'D'E ') = H (where A to H are the first to third ACB (A, D, G), the first And a contact state of the second tie ACB (C, F) and the first to third emergency generator ACBs (B, E, H), and A 'to H' indicate a contact state b). Interlock device for a switchgear breaker, characterized in that configured according to the logic conditions. The method according to claim 2, The logic processor 33, B '(C' + D'E ') = A, A' (C '+ D'E') = B, F '(A'B' + D'E ') = C, E' (C'F '+ C'G'H' + A'B'F ') = D, D' (C'F '+ A'B'F' + C'G'H ') = E, C' (D'E '+ G'H') = F, H '(F' + D'E ') = G, G' (F '+ D'E') = H (where A to H are the first to third ACBs) (A, D, G), the contact point a of the first and second tie ACB (C, F) and the first to third emergency generator ACB (B, E, H) is shown, A 'to H' Is a contact point b) state of the switch according to the logic conditions according to the interlock device of the circuit breaker. The method according to claim 3 or 4, The interlock control unit 30 includes the first to third ACBs (A, D and G), the first and second tie ACBs (C and F) and the first and third emergency generator ACBs (B and E, Interlocking device of the switchgear breaker, characterized in that it further comprises a logic setting unit 36 for individually controlling the operation of H).

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