JP3393509B2 - Main circuit switchgear - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a main circuit switchgear disposed between a generator and a main transformer in a low-voltage synchronous power plant. The present invention relates to an arrangement structure of an instrument transformer and a surge absorber connected to a generator side and a main transformer side. FIG. 6 is a single line connection diagram in the case of a high voltage synchronous system of a power plant, FIG. 7 is a single line connection diagram in the case of a low voltage synchronous system of a power plant, and FIG. 8 is an electrical connection of a main circuit switchgear. FIG. 9 is a single line connection diagram showing connection of the power generation main circuit, and FIG. 10 is a front view showing the equipment arrangement of the power generation main circuit. In the figure, 1 is a generator, 2 is a main transformer,
3 is an in-house transformer, 4 is a start-up transformer, 5 to 8 are circuit breakers, 9
Is a bus line, 10 and 11 are transmission lines, and a generator 1 is a main transformer 2
And is connected to the power transmission line 10 via the circuit breaker 5. The generator 1 and the main transformer 2 are connected to the bus 9 via the on-site transformer 3 and the circuit breaker 6. In addition,
The starting transformer 4 has a bus 9 and a circuit breaker 8 via a circuit breaker 7.
Is connected to the power transmission line 11. In this high voltage synchronous system, when the generator 1 is started, power is supplied to the generator 1 via the starting transformer 4 and the in-house transformer 3,
In synchronism with the voltage of the power transmission line 10, the circuit breaker 5 inputs power from the generator 1 to the power transmission line 10 via the main transformer 2. In place of the above high voltage synchronization method, recently,
A low-voltage synchronous system as shown in the single-line connection diagram of FIG. 7 that does not require the starting transformer 4 has been adopted. In this case, the main circuit switching device 12 is disposed between the generator 1 and the main transformer 2. FIG. 8 shows the configuration of the main circuit switching device 12. In the figure, 13 is a circuit breaker, 14 is a disconnecting device connected to the circuit breaker 13, 15 is a circuit breaker side grounding device connected to the circuit breaker 13, 16 is a circuit breaker side grounding device connected to the disconnecting device 14, Reference numeral 17 denotes an instrument current transformer that measures the current on the circuit breaker side, and reference numeral 18 denotes an instrument current transformer that measures the current on the disconnector side. Then, rather than arranging the breaker 13, the breaker 14, the breaker side and the breaker side grounding devices 15 and 16 as separate single devices, they are arranged together.
If all of these are integrated in the same container, the installation area can be reduced and the manufacturing cost can be reduced. Therefore, the integrated main circuit switchgear is often used. [0006] In the power plant where the main circuit switchgear 12 is installed, an instrument transformer is connected to the generator 1 for measuring the voltage of the generator 1 and also connected to the main transformer. There is a need for an instrument transformer for measuring the voltage of the connected bus and a surge absorber for protecting against abnormal voltages. The instrument transformer and the surge absorber are arranged and connected as shown in FIGS. In FIGS. 9 and 10, reference numeral 20 denotes a first cubicle disposed on the generator 1 side of the main circuit switching device 12, which houses an instrument transformer (not shown). 21 is a main conductor connected to the generator 1 side of the main circuit closing device 12, 22 is a branch conductor branched from the main conductor 21,
It is drawn into the first cubicle 20 and connected to an instrument transformer. Reference numeral 23 denotes a second cubicle disposed on the main transformer 2 side of the main circuit switchgear 12 and accommodates an instrument transformer and a surge absorber (not shown). Reference numeral 24 is a main conductor connected to the main transformer 2 side of the main circuit switchgear 12, and 25 is a branch conductor branched from the main conductor 24. The branch conductor is drawn into the second cubicle 23, and is used as an instrument transformer and surge absorber. It is connected to the. FIG. 11 is a front view showing the structure of a conventional main circuit switchgear disclosed in Japanese Patent Laid-Open No. 11-53999. In the figure, 26 is an insulating tube, 27 is a blocking portion fixed side conductor fixed to one end of the insulating tube 26, 28 is a blocking portion movable side conductor fixed to the other end of the insulating tube 26, and 29 is a blocking portion fixed side conductor. A fixed contact 30 fixed to 27, 30 is a movable contact, and is supported in the blocking portion movable-side conductor 28 through a fixed contact 29 and a sliding portion so as to be able to contact and separate. And the said insulation cylinder 26, interruption | blocking part fixed side conductor 27, interruption | blocking part movable side conductor 2
8. Blocking section 31 with fixed contact 29 and movable contact 30
Is formed. Reference numeral 32 denotes a disconnecting portion fixed contact connected to the breaking portion movable side conductor 28, and a partition wall 33 is formed between the breaking portion movable side conductor 28, and the cutoff portion movable side conductor 28 has six hooks. Insulating gas such as sulfur fluoride is enclosed. Reference numeral 34 denotes a disconnecting portion movable side conductor disposed away from the disconnecting portion fixed side conductor 32, and reference numeral 35 denotes a movable conductor, which can be connected to and disconnected from the disconnecting portion movable side conductor 34 via the fixed contact 32 and the sliding portion. It is supported. And the said fixed contact 32, the disconnection part movable side conductor 3
4 and the movable conductor 35 form a disconnecting portion 36. Reference numeral 37 denotes a first insulating support member that supports the blocking portion 31 via the blocking portion movable side conductor 28, and reference numeral 38 denotes a second insulating support member that supports the disconnection portion 36 via the disconnection portion movable side conductor 34. , 39 is an external lead terminal connected to the blocking portion fixed-side conductor 27, 40 is an external lead terminal connected to the disconnecting portion movable side conductor 34, and 41 covers the blocking portion 31 and the disconnecting portion 36 integrally. The first metal containers 42 and 43 are current transformers for measuring instruments arranged inside both ends of the first metal container 41, respectively. Reference numeral 44 denotes a second metal container as a support frame connected to the lower portion of the first metal container 41. On the second metal container 44, the first and second insulating support members 37 and 38 are provided. Is arranged. Reference numeral 45 denotes a shut-off unit operating device disposed in the second metal container 44, which has a first insulating operating rod 46 and operates the movable contact 30 so as to be able to contact and separate from the fixed contact 29. Reference numeral 47 denotes a disconnecting portion operating device disposed in the second metal container 44, which has a second insulating operating rod 48 and operates the movable conductor 35 so as to be able to contact and separate from the fixed contact 32. Reference numeral 49 denotes a breaking portion grounding operation device disposed in the second metal container 44, and manipulates the breaking portion fixing side conductor 27 via the first grounding conductor 50 so that it can be grounded. 51 is the second
In the disconnecting portion grounding operation device arranged in the metal container 42,
The disconnecting portion movable conductor 34 is operated via the second ground conductor 52 so as to be grounded. With the above configuration, the breaker 31, the breaker 36, 49 as the breaker-side grounding device,
50, 51 and 52 as disconnector side grounding devices are integrated, and the main circuit switching device 12 is configured as shown in FIG. [0014] As described above, the conventional main circuit switching device includes the blocking portion 31 and the disconnecting portion 36 in the first manner.
Each of the operating devices that are arranged in the metal container 41 and operate to contact / separate each of the blocking part 31 and the disconnecting part 36 in the second metal container 44 connected to the lower side of the first metal container 41. 45, 47 and 49, 51 are arranged to reduce the installation space. However, when installing in a power plant, as shown in FIGS. 9 and 10, the main circuit switching device 12 is provided. Since cubicles 20 and 23 are arranged on both sides of the cabinet and an instrument transformer and a surge absorber must be accommodated in the cubicles 20 and 23, it is difficult to reduce the installation space and rationalize the work. There was a problem. The present invention has been made to solve the above-mentioned problems. An instrument transformer and a surge absorber are provided in a second metal container in which an operating device for operating a shut-off portion and a disconnecting portion is housed. The main circuit switchgear that can reduce the installation space in the power plant is obtained. According to a first aspect of the present invention, there is provided a main circuit switchgear according to a first aspect of the present invention. In a main circuit switching device provided in a second metal container connected to the lower part of one metal container and having an operating device for operating a contact portion and a disconnecting portion respectively, the first and second metal containers A first insulating bushing that is disposed through the connecting portion and connected to the blocking portion, and a second insulating bushing that is connected to the disconnecting portion.
Insulating bushings, instrument transformers disposed in a second metal container and connected to the first insulating bushings, and instrument transformers and surge absorbers respectively connected to the second insulating bushings It is. DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Embodiments of the present invention will be described below with reference to the drawings. 1 is a front view showing a configuration of a main circuit switching device according to Embodiment 1 of the present invention;
2 is a side view showing a part of the main circuit switchgear of FIG. 1 in cross section, and FIG. 3 is a single-line diagram showing electrical connection of the main circuit switchgear of FIG. In the figure, 56 is an insulating tube, 57 is a blocking portion fixed side conductor fixed to one end of the insulating tube 56, 58 is a blocking portion movable side conductor fixed to the other end of the insulating tube 56, and 59 is a blocking portion. A fixed contact 60 fixed to the fixed-side conductor 57, 60 is a movable contact, and the fixed contact 59 in the blocking portion movable-side conductor 58 is provided.
And is supported so as to be able to contact and separate through a sliding part. And
The insulating cylinder 56, the blocking portion fixed side conductor 57, the blocking portion movable side conductor 58, the fixed contact 59 and the movable contact 60 form a blocking portion 61. Reference numeral 62 denotes a disconnecting portion fixed contact connected to the breaking portion movable side conductor 58, and a partition wall 63 is formed between the breaking portion movable side conductor 58. Insulating gas such as sulfur fluoride is enclosed. Reference numeral 64 denotes a disconnectable portion movable side conductor disposed away from the disconnectable portion fixed side conductor 62, and reference numeral 65 denotes a movable conductor, which can be brought into and out of contact with the fixed contactor 62 and the sliding portion in the disconnectable portion movable side conductor 64. It is supported. And the said stationary contact 62, the disconnection part movable side conductor 6
4 and the movable conductor 65 form a disconnecting portion 66. Reference numeral 67 denotes a first insulating support member that supports the blocking portion 61 via the blocking portion movable side conductor 58, and 68 denotes a second insulating support member that supports the disconnection portion 66 via the disconnection portion movable side conductor 64. 69 is an external lead terminal connected to the blocking portion fixed side conductor 57, 70 is an external lead terminal connected to the disconnecting portion movable side conductor 64, and 71 integrally covers the blocking portion 61 and the disconnecting portion 66. The first metal containers 72 and 73 are current transformers for measuring instruments arranged inside the both ends of the first metal container 71, respectively. 74 is a second metal container as a support frame connected to the lower part of the first metal container 71. On the second metal container 74, the first and second insulating support members 67 and 68 are provided. Is arranged. Reference numeral 75 denotes a shut-off unit operating device arranged in the second metal container 74, which has a first insulating operating rod 76, and operates the movable contact 60 so as to be able to contact and separate from the fixed contact 59. Reference numeral 77 denotes a disconnecting portion operating device arranged in the second metal container 74, which has a second insulating operating rod 78 and operates the movable conductor 65 so as to be able to contact and separate from the fixed contact 62. 79 is a breaker grounding operation device arranged in the second metal container 74, and operates the breaker fixed side conductor 57 via the first grounding conductor 80 so that it can be grounded. Reference numeral 81 denotes a disconnecting portion grounding operation device disposed in the second metal container 74, and operates so that the disconnecting portion movable conductor 64 can be grounded via the second grounding conductor 82. Reference numeral 83 denotes a first insulating bushing which is disposed through the connecting portion between the two metal containers 71 and 74.
As a result, the upper part is connected to the blocking part fixed-side conductor 57. Reference numeral 85 denotes a second insulating bushing that is disposed through the connecting portion between the two metal containers 71 and 74, and the upper portion is connected to the disconnecting portion movable-side conductor 64 by a connection line 86. Reference numeral 87 denotes an instrument transformer disposed in the second metal container 74 and is connected to the first insulating bushing 83 by a connection line 88. 89 is an instrument transformer disposed in the second metal container 74, and 90 is a surge absorber disposed adjacent to the instrument transformer 89.
The insulating bushing 85 is connected. With the above-described configuration, the breaker 61, the disconnector 66, the instrument current transformers 72 and 73, the interrupter grounding device 79, the disconnector grounding device 81, and the instrument transformer 87. The instrument transformer 89 and the surge absorber 90 are housed together to form a main circuit switching device 92 as shown in FIG. As described above, according to the first embodiment, the second metal container 7 connected to the lower portion of the first metal container 71 containing the electrically connected blocking part 61 and the disconnecting part 66 is provided.
First and second insulating bushings 8 that pass through the connecting portion with 4
3 and 85, respectively, and the insulating bushings 83 and 8
5, the instrument transformers 87 and 89 and the surge absorber 90 are arranged, so that there is no need to arrange cubicles on both sides of the main circuit switching device 92 as in the prior art, and the grounding area in the power plant Can be reduced. Further, since it can be prevented from being affected by a high magnetic field and high temperature during energization, the reliability and maintainability of the equipment can be improved. In addition, since only half of each of the first and second insulating bushings 83 and 85 exists in the first metal container 71, the tolerance of the insulation distance to the switchgear device is increased, and the design freedom is increased. The degree can be increased. Embodiment 2 FIG. FIG. 4 is a front view showing the configuration of the main circuit switchgear according to Embodiment 2 of the present invention, and is the one shown in FIG. 1 showing Embodiment 1 except that a plurality of instrument transformers are arranged on the interrupting section side. Detailed description will be omitted. In the first embodiment, the blocking unit 61
Although the case where there is one instrument transformer 87 connected to the side has been described, even if it is applied to the case where there are two instrument transformers 87 as in the present embodiment, Similar effects can be obtained. Embodiment 3 FIG. FIG. 5 is a front view showing the configuration of the main circuit switchgear according to the third embodiment of the present invention, in which the disconnecting portion fixed contact 62 and the movable contact 65 are arranged opposite to those in the first embodiment. Also in the main circuit switching device, the same effect as in the first embodiment can be obtained. As described above, according to the first aspect of the present invention, the blocking portion and the disconnecting portion which are arranged in electrical connection within the first metal container, and the first metal container. In a main circuit switchgear having an operating device arranged in a second metal container connected to the lower part of the switch and operating the disconnecting part and the shutoff part respectively, the connecting part of the first and second metal containers is penetrated. A first insulating bushing each disposed and connected to the blocking portion, and a second insulating bushing connected to the disconnecting portion,
Since it was set as the structure provided with the instrument transformer and the surge absorber each arrange | positioned in the 2nd metal container and connected with the 1st insulation bushing, and the 2nd insulation bushing, respectively, A main circuit switching device capable of reducing the installation area can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view showing a configuration of a main circuit switchgear according to Embodiment 1 of the present invention. FIG. 2 is a side view showing a part of FIG. 1 in section. FIG. 3 is a single-line diagram showing electrical connections in FIG. FIG. 4 is a front view showing a configuration of a main circuit switchgear according to Embodiment 2 of the present invention. FIG. 5 is a front view showing a configuration of a main circuit switching device according to Embodiment 3 of the present invention; FIG. 6 is a single line connection diagram in the case of a high voltage synchronous system of a power plant. FIG. 7 is a single line connection diagram in the case of a low-pressure synchronous system of a power plant. FIG. 8 is a single-line diagram showing electrical connection of a conventional integrated main circuit switchgear. FIG. 9 is a single-line diagram showing connection of the power generation main circuit. FIG. 10 is a front view showing a device arrangement of the power generation main circuit. FIG. 11 is a front view showing a configuration of a conventional main circuit switchgear. [Explanation of symbols] 61 interception part, 66 disconnection part, 71 first metal container,
74 second metal container, 83 first insulating bushing,
85 Second bushing, 87,89 Instrument transformer,
90 Surge absorber.

─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-8-306282 (JP, A) JP-A-3-239105 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02B 13/02 H01H 31/32 H01H 33/70-33/99

Claims (1)

(57) Claims 1. A blocking portion and a disconnecting portion that are electrically connected in a first metal container, and a first portion connected to a lower portion of the first metal container. In a main circuit switchgear provided with an operating device that is disposed in two metal containers and operates to connect and separate the shut-off part and the disconnecting part, respectively, and is disposed through the connecting part of the first and second metal containers. A first insulating bushing connected to the blocking portion, a second insulating bushing connected to the disconnecting portion, and a meter disposed in the second metal container and connected to the first insulating bushing. A main circuit switchgear comprising: an electrical transformer, and an instrument transformer and a surge absorber respectively connected to the second insulating bushing.