JP3076469B2 - Power supply switching method in distribution substation and power supply unit in power station - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for supplying power to a load installed in a distribution substation, and more particularly to a method and an apparatus for switching power supply in a distribution substation. In the event of an abnormality such as a failure of a transformer installed in the plant, the load on the plant that needs to secure the power supply with priority such as a distribution board for work, ventilation, a smoke exhaust fan, a drainage pump, a fire alarm board, and a guide light The power can be switched and supplied so as to secure the power.

[0002]

2. Description of the Related Art A conventional substation power supply of this type uses a plurality of, for example, three main transformers, each of which is connected to a secondary output side of the substation. Connect the internal load to the secondary output side of the transformer, and manually connect to the secondary output side of another main transformer in the event of an abnormal condition such as an open phase or no voltage condition of the main transformer or the internal transformer. A method of connecting an in- house load to the secondary output side of an in-house transformer has been adopted.

[0003]

In the above-mentioned conventional power supply device for a distribution substation, a power supply which needs to secure power supply preferentially is connected instead of another load. In some cases, the switching operation is a manual operation and cannot be promptly performed.

[0004] The present invention has been made in view of the above problems, the output abnormality of the secondary output side of the house transformer connected preferential plant load, other than the main transformer connected to the house transformer A power distribution system in which power is automatically switched so that power is supplied from the main transformer to local loads that need to be secured with priority, and the power of priority local loads is automatically switched quickly. The present invention provides a method of switching power supply in a substation and a power supply device in a power station.

[0005]

According to a first aspect of the present invention, there is provided a method of switching power in a distribution substation according to the first aspect of the present invention .
Comprising a first to third main transformer, the second and third each of the main along with connecting the first main transformer of the secondary system of the secondary output side to the first and second of each house transformer respectively the secondary output side of the single power transformer and connected to the third and fourth respective plants <br/> the transformer, the the first secondary output side of the house transformer connected priority plant load And the second to fourth
Connect the non-priority plant load on the secondary output side of the house transformer,
When the output of the first in- house transformer to which the priority in-house load is connected is abnormal on the secondary output side, the first in- house transformer is connected.
The priority local loads are arranged in a predetermined order on the secondary output side of the third or fourth local transformer connected to the secondary output side of the second or third main transformer other than the first main transformer. Controlled switching connection.

According to a second aspect of the present invention, there is provided a method for switching power supply in a distribution substation, comprising at least three first to third main transformers, wherein the first main transformer is provided. the first to the secondary output side
1 and the second and third transformers.
The main transformer each secondary output side connecting the second and <br/> the transformer third place, the the first secondary output side of the house transformer priority plant load and the non-priority institution for connect the non-priority plant load to the second and the secondary output side of the third house transformer with connecting the load, the secondary first place <br/> the transformer connected to the priority plant load at the output side the output anomaly, in which the first second non house transformer or the third priority plant load on the secondary output side of the house transformer of being controlled to a preset order that switching connection .

[0007] distribution substations house power supply of the invention described in claim 3, with the three first to third main transformer less, one of the first two systems of the main transformer secondary a first house transformer which is connected to connect the priority house load on the output side, the other system <br/> integration of the secondary output of said first dual of the main transformer of the system integration the to be connected to a side connecting the non-priority plant load
And 2 of the house transformer, third and fourth house transformer connecting each said second and third non-priority plant load is connected to the secondary output side of the main transformer, the first between <br/> house transformer secondary output priority house load and the
2 to the switching device for switching connecting the secondary output side of each connected second to fourth house transformer preferentially plant load between the fourth secondary output side and the non-priority plant load of each house transformer When the at priority institution for secondary output side of the first house transformer connected to load output abnormalities, other than the first main transformer the switching device a switching control to connect the first house transformer Connected to the secondary output of the second or third main transformer
A control unit is provided on the secondary output side of the third or fourth local transformer to switch and connect the priority local loads in a preset order.

According to a fourth aspect of the present invention, there is provided the power supply device for a distribution substation according to the third aspect of the present invention, wherein the switchboard and the control unit are provided with dehumidification inside a switchboard housing. And a heat shield plate attached to the outer surface of the housing with a gap.

[0009]

According to a first aspect of the present invention, there is provided a method for switching power supply in a distribution substation according to the first aspect of the present invention, wherein the first main transformer or the first local transformer to which a priority local load is connected, such as an open phase or no voltage state . In the event of an output abnormality at the secondary output side of one local transformer, a second or third main transformer other than the first main transformer to which the first local transformer is connected in accordance with a preset order, for example, , first connected to the secondary output side of the second main transformer
3. The priority local load is switched and connected to the secondary output side of the local transformer. In this case, the priority station load was connected to the first
If an abnormality occurs on the secondary output side of the main transformer, the load on the non-priority station connected to the secondary output side will be in a power outage state, but the first on- site transformer to which the load on the priority station is connected When an abnormality occurs on the next output side, power is continuously supplied to the non-priority local load, and the non-priority local load connected to the third local transformer to which a new priority local load is connected is continuously supplied. Power is supplied.

Furthermore, the can and the output abnormality occurs <br/> the secondary output side of the third house transformer connected priority plant load in this state, the third main transformer in accordance with a pre-set sequence The priority local load is automatically switched and connected to the secondary output side of a fourth local transformer connected to the secondary output side of the unit. In this case as well, the non-priority internal load connected to the secondary output side of the third internal transformer to which the priority internal load was connected is in a power outage state, and the fourth internal load to which the new priority internal load is connected is also connected. Power is continuously supplied to the non-priority site loads connected to the device.

In this state, the load in the priority station is connected.
When the output abnormality occurs in the secondary output side of the fourth house transformer, it follows the order set in advance, the first main transformer
A second point connected to the secondary output of the other system of the vessel
Automatically switch and connect the priority internal load to the internal transformer . Again, non-priority plant load connected to the secondary output side of the fourth house transformer priority plant load was connected becomes the power failure state, also the second place of connecting the newly priority plant load < The non-priority local load connected to the internal transformer is continuously supplied with power.

In this method, each of the first to third main transformers is
First to fourth local transformers connected to each secondary output side of the vessel
The vessel is suitable for connecting two sets of in-house loads.

[0013] In the power supply switching method for a distribution substation according to the second aspect of the present invention, similarly, the priority substation load is connected .
In the event of an output abnormality at the primary output of the primary transformer or at the secondary output of the first in- house transformer, the secondary transformer is activated in a preset order .
Other third main transformer, for example, connecting switches the priority plant load on the secondary output side of the second house transformer connected to the secondary output side of the second main transformer. Further, a third plant that the priority plant output abnormality of the secondary output side of the second house transformer a load is connected to, coupled in the order that is set in advance in the secondary output side of the third main transformer Automatically switch and connect the priority local load to the secondary output side of the transformer. This method is suitable when there is room on each secondary output side of the first to third local transformers.

[0014] wherein distribution substations house power supply of the invention described in claim 3, the first main transformer or the first, such as the first phase loss or no-voltage state of the house transformer connected priority plant load
When the output abnormality of the secondary output side of the in- house transformer is detected, the control unit switches and controls the switch, and the first in- house transformer other than the first main transformer to which the first in-house transformer is connected is controlled in a preset order . A priority local load is switched and connected to a secondary output of a third local transformer connected to a secondary output of a second or third main transformer, for example, a secondary main transformer. In this case, the non-priority local load connected to the secondary output side of the first local transformer to which the priority local load was connected is in a power outage state, and is connected to the local transformer to which the new priority local load is connected. Power is continuously supplied to the non-priority site loads.

[0015] Further, a third connection to which the priority local load is connected .
When an output abnormality is detected at the secondary output side of the in- house transformer, the control unit switches and controls the switch, and the third unit connected to the secondary output side of the third main transformer in a preset order . The priority local load is automatically switched and connected to the secondary output side of the local transformer. Also in this case, the non-priority internal load connected to the secondary output side of the fourth internal transformer to which the priority internal load was connected is in a power outage state, and the fourth internal transformer to which the new priority internal load is connected is also connected. Power is continuously supplied to the non-priority site loads connected to the device.

According to a fourth aspect of the present invention, there is provided a power supply unit for a distribution substation, wherein a switch and a control unit are dehumidified by a dehumidifier provided in a switchboard housing, and a gap is provided on an outer surface of the housing. Heat is blocked by the attached heat shield plate, which prevents a rise in temperature inside the switchboard casing and prevents dew condensation, thereby preventing the switch and the control unit from malfunctioning due to overheating or dew condensation.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A power supply unit in a distribution substation according to an embodiment of the present invention will be described with reference to FIG.

Three first to third main transformers 1A, 1B,
It has 1C. The first to third main transformers 1A, 1A
B, among 1C, the first house transformer 3 is connected to the secondary output side of the hand of the system integration 2B of the first main transformer 1A, the secondary output side of the first house transformer 3 The priority internal load 5 such as a work distribution board, ventilation, a smoke exhaust fan, a drain pump, a fire alarm board, and a guide light is connected to the switchboard. Further, the first main transformer 1A
The second house transformer 3B connected to the secondary output side of the other side of the line 2A, to connect the non-priority plant load 5B in the secondary output side of the second house transformer 3B.

Further, the second and third main transformers 1B,
The respective secondary output side of the hand of the system integration 2A of 1C 3 and the
4 in- house transformers 6 and 7 are connected. This third and fourth
The non-priority local loads 10, 11 are connected to the secondary output sides of the local transformers 6, 7, respectively.

Further, the priority local load 5 is connected to the
1 between the secondary output side of the local transformer 3 and the non-priority local load 5B and between the secondary outputs of the third and fourth local transformers 6 and 7 and the non-priority local loads 10 and 11 Are connected to switching devices 12, 13, 14 such as magnet switches, respectively.

Further, a first connection of the priority local load 5 is provided .
A main switching device 15 such as a magnet switch is connected between the secondary output side of the local transformer 3 and the priority local load 5 and to the secondary output sides of the third and fourth local transformers 6 and 7, respectively. The switches 12, 13, and 14 are connected between the main switch 15 and the priority local load 5, respectively.

Further, the first to fourth internal transformers 3, 3B, 6, 7 connected to the priority internal load 5 and the non-priority internal loads 5B, 10, 11 are connected to the first or fourth internal transformers due to an open phase or no voltage state .
First to fourth house transformer 3, 3B, 6,7 secondary output side of the output abnormality sensor detects 16, 16b, 17, 18 are provided.

Further, the switching unit 12 and the priority local load 5
And a sensor 19 for detecting an output abnormality.

Reference numeral 20 denotes a control unit which detects the abnormalities of the sensors 16, 16B, 17, 18, and 19 based on the logic stored in the CPU, and switches the switching units 12, 13, 14 and the main switching unit. Sequence control of the container 15 in a preset order,
First on-site transformer 3 connected to priority on-site load 5 in case of abnormality
A first main transformer other than 1A the second and third connecting a
Third or third power transformer connected to the secondary output side of the main transformers 1B and 1C
A priority local load 5 is connected to the secondary output side of a fourth local transformer 6, 7, for example, a third local transformer 6 .

The secondary output of one of the third and fourth local transformers 6 and 7 has a power supply up to the combined capacity of the priority local load 5 and one of the non-priority local loads 10 and 11. It is the capacity that can supply.

Further, as shown in FIG.
12, 13, 14 and the main switching unit 15 and the control unit 20 switchboard cabinet dehumidifier 22 to 21 which is arranged inside the are al provided. Further, a heat shield plate 23 is provided on each outer surface of the housing 21 with a gap. A display opening 25 is formed in the front heat shield plate 23 in correspondence with the display window 24 of the switchboard case 21, and an operation unit 28 is formed with a notch facing the handle 27 of the door 26. Have been.

Next, the operation of this embodiment will be described.

First main transformer to which priority internal load 5 is connected
When the sensor 16 detects an abnormal output on the secondary output side of the first in- house transformer 3 due to 1A or the open-phase or no-voltage state of the first in- house transformer 3, the control unit uses the detection signal of the sensor 16 to detect the abnormality.
20 switches and connects the switching unit 13 and the main switching unit 15 in sequence according to a preset order, and connects the first local transformer 3 to a unit other than the first main transformer 1A , for example, the connected to the secondary output side of the second main transformer 1B
The priority local load 5 is switched and connected to the secondary output side of the local transformer 6 to supply power to the priority local load 5.

[0029] In this case, if an abnormality occurs in the secondary output side of the first main transformer 1A, other strains of the first main transformer 1A
The non-priority local load 5B connected to the third local transformer 3B connected to the secondary output side of 2A is in a power outage state, but is connected to the secondary output side of one system 2B of the first main transformer 1A. If an abnormality occurs only on the secondary output side of the connected first internal transformer 3, power is continuously supplied to the non-priority internal load 5B. Further, power is also continuously supplied to the non-priority internal load 10 connected to the third internal transformer 6 to which the new priority internal load 5 is connected.

Furthermore, when the second house transformer 6 of the secondary output side of the output abnormality of the sensor 17 which is connected a priority plant load 5 has detected in this state, the main control unit 20 and the switching unit 14 by the detection signal The switching unit 15 is connected to the switching unit 15 by performing a sequence control in accordance with a preset sequence, and is connected to the secondary output side of the fourth local transformer 7 connected to the secondary output side of another third main transformer 1C. The priority local load 5 is automatically switched and connected.
In this case, the non-priority local load 10 connected to the third local transformer 6 enters a power outage state. In addition, power is continuously supplied to the non-priority internal load 11 connected to the fourth internal transformer 7 to which the priority internal load 5 is newly connected.

In this state, the output abnormality on the secondary output side of the fourth in- house transformer 7 to which the priority in-house load 5 is connected is detected by a sensor.
When 18 detects, the control unit 20 switches by the detection signal.
12 and the main switching unit 15 are switched and connected in sequence control in accordance with a preset sequence, and are switched and connected, and the other system of the first main transformer 1A to which the priority local load 5 is connected first.
The second local transformer 3 connected to the secondary output of the 2A
And automatically connects and switches the priority local load 5 to the secondary output side. Again, the non-priority plant load 11 connected to the fourth house transformer 7 is a power outage, the non-priority plant connected to the second house transformer 3B newly connected preferential plant load 5 Power is continuously supplied to the load 5B.

Further, the main switching device 15 and the priority local load 5
Similarly, when the sensor 19 provided between the control unit 20 and the control unit 20 detects an output abnormality, the control unit 20 controls the switching of the switching units 12, 13, and 14 and the main switching unit 15.

Further, switching devices 12, 13, 14 and a main switching device
A dehumidifier 22 provided in a switchboard casing 21 in which the control unit 15 and the control unit 20 are disposed dehumidifies the switchboard casing 21. The heat is shielded by a heat shield plate 23 attached to the outer surface of the housing 21 with a gap. Accordingly, it is possible to prevent a temperature rise in the switchboard housing 21 installed outdoors and to prevent dew condensation, and
12, 13, 14, the main switching unit 15 and the control unit 20 are prevented from overheating or dew condensation, and the switching units 12, 13, 14, the main switching unit
15 and the control unit 20 are prevented from malfunctioning.

Next, another embodiment will be described with reference to FIG.

The three first to third main transformers 1A, 1B,
Equipped with 1C, the first to third main transformer 1A, 1B, 1C of the two systems 2A, among the secondary output of the 2B, respectively to the secondary output side first to third individual one system integration 2A In- house transformers 3, 6, 7
To the secondary output side of the first in- house transformer 3, main switching of priority in-house loads 5 such as a work distribution board, ventilation, smoke exhaust fan, drainage pump, fire alarm board, and guide light. Container 15
To connect via the. Non-priority local loads 5B, 10, 11 are connected to the secondary outputs of the first to third local transformers 3 , 6, 7 via switches 12, 13, 14, respectively.

Further, the main switching device 15 and the priority internal load 5
Between the first and the second through the switching devices 12, 13, and 14 .
The secondary output sides of the main transformers 1A, 1B, and 1C are connected respectively .

Further, the first to third internal transformers 3, 6, 7 to which the priority internal load 5 and the non-priority internal loads 5B, 10, 11 are connected are connected to the secondary output side . Main transformer 1A, 1B, 1C or first to third in- house transformers 3,
1st to 1st due to open phase of 6 or 7 or no voltage state
Sensors 16, 17, 18 for detecting output abnormalities on the secondary output side of the in- house transformers 3, 6, 7 are provided. Further, a sensor 19 for detecting an output abnormality is provided between the switching unit 12 and the load 5 in the priority station.

Reference numeral 20 denotes a control unit which previously sets the switching units 12, 13, 14 and the main switching unit 15 by detecting an abnormality of the sensors 16, 17, 18, 19 based on the logic stored in the CPU. The sequence control is performed in the order given, and the first local transformer 3 connected to the priority local load 5 is connected to the first local transformer 3 .
The second or third main transformer 1B other than the main transformer 1A
The priority local load 5 is connected to the secondary outputs of the second or third local transformers 6, 7 connected to the secondary output of 1C.

The secondary outputs of the first to third station transformers 3, 6 and 7 supply power to a capacity of the priority station load 5 and one of the non-priority station loads 10 and 11. The capacity can be supplied.

Next, the operation of this embodiment will be described.

First main transformer to which priority local load 5 is connected
1A or the first phase loss or abnormal output of the sensor of the secondary output side of the first house transformer 3 including voltage-off state of the house transformer 3
When 16 detects, for example, the detection signal of this sensor 16
And a control unit 20 switching unit 13 and the main switching device 15, and switching connection sequence control according to the order set in advance, the first main transformer connected to the first house transformer 3
Second or third main transformers 1B and 1C other than 1A , for example
In the second and the main transformer secondary output side of the second place <br/> the transformer 6 connected to the secondary output side of 1B switches the priority plant load 5 connected, the power supply to the priority plant load 5 Supply. In this case, the first
If an abnormality in the secondary output side of the main transformer 1A occurs in the first connected to the secondary output side of one of the strains 2A of the first <br/> main transformer 1A 1
Non-priority house is non-priority plant load 5B connected to the inner transformer 3 at the becomes a power outage, the newly connected priority house load 5 in <br/> the transformer 6 second where the connected Power is continuously supplied to the load.

Further, in this state, when the sensor 17 detects an output abnormality on the secondary output side of the second in- house transformer 6 to which the priority in-house load 5 is connected, the control unit 20 communicates with the switch 14 by the detection signal. And switching connection with the switching unit 15 by performing sequence control in accordance with a preset sequence, and connecting the third main transformer 1C
Automatically switches and connects the priority local load 5 to the secondary output side of the third local transformer 7 connected to the secondary output side. Also in this case, the non-priority local load 10 connected to the second local transformer 6 is in a power outage state, and the non-priority local load 11 newly connected to the third local transformer 7 to which the priority local load 5 is connected. Is supplied with power continuously.

[0043]

According to the first and third aspects of the present invention, the first main transformer or the second main transformer connected to the priority local load is connected .
In the event of an output abnormality on the secondary output side of the first in- house transformer such as an open-phase or no-voltage state of the first in- house transformer, a power supply other than the main transformer to which the first in- house transformer is connected is set in a preset order. Another second or third main transformer , for example,
Connected switching priority plant load on the secondary output side of the third house transformer connected to the secondary output side of the second main transformer, further a third house transformer connected priority plant load in this state to come and vessels of abnormal output to the secondary output side occurs, the other third
The priority internal load can be automatically switched and connected to the secondary output side of the fourth local transformer connected to the secondary output side of the main transformer, and the priority local load can be connected in this state . Even when an output abnormality occurs on the secondary output side of the local transformer, the other main system of the first main transformer to which the priority local load is connected first by switching and connecting in accordance with a preset order. automatically connect switching priority house load of the secondary output side second house transformer connected to. Each secondary output side of the house transformer is suitable when the capacity to connect the two sets of house loads, the output abnormality of the secondary output side of the first house transformer connected preferential plant load, the first It was connected to the house transformer
The internal load, which needs to secure the power supply preferentially at the secondary output side of the second or third main transformer other than the first main transformer, is automatically switched, and the power supply of the priority internal load is changed. Quick and automatic switching.

According to the invention of claim 2, similarly,
When the output of the first main transformer to which the priority local load is connected or the secondary output side of the first local transformer is abnormal, the other secondary or secondary power is output.
The third main transformer, for example, is connected to switch the priority plant load to the second secondary output side of the second house transformer connected to the secondary output side of the main transformer, the connecting the preferential plant load 2 , when the output of the secondary output side of the in-house transformer is abnormal, a third output connected to the secondary output side of another third main transformer in order .
The house transformer automatically be connected switching priority plant load on the secondary output side, suitable for the case where there is a margin in the secondary output side of the house transformer, it is possible to reduce the number of house transformer.

According to the fourth aspect of the present invention, the rise in temperature inside the switchboard casing is prevented, and dew condensation is prevented, so that the switch and the control unit can be prevented from malfunctioning due to overheating or dew condensation.

[Brief description of the drawings]

FIG. 1 is a block circuit diagram of a power supply device in a distribution substation showing an embodiment of the present invention.

FIG. 2 is a side view of the switchboard case;

FIG. 3 is a block circuit diagram of a power supply device in a distribution substation showing another embodiment of the present invention.

[Explanation of symbols]

1A, 1B, 1C Main transformer 2A, 2B Two systems of main transformer 3, 3B, 6, 7 In-house transformer 5 Priority in-house load 5B, 10, 11 Non-priority in-house load 12, 13, 14 Switcher 15 Switcher Main switch as control unit 20 control unit 21 switchboard case 22 dehumidifier 23 heat shield plate

Continuing on the front page (72) Inventor Katsumi Kato 1-3-3 Uchisaiwai-cho, Chiyoda-ku, Tokyo Within Tokyo Electric Power Company (72) Inventor Shun Nakano 1-1-1 Bentendori, Naka-ku, Yokohama-shi, Tokyo Company, Kanagawa Branch (72) Inventor Hiroshi Kaneko 2-6-1, Minamimachi, Mito-shi, Ibaraki Prefecture Tokyo Electric Power Company Ibaraki Branch (56) References JP-A-4-285438 (JP, A) JP-A Sho 54 −42632 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02J 9/00-11/00

Claims (4)

(57) [Claims] 1. A least comprises three first to third main transformer, the first main transformer of the secondary system of the secondary output side to the first and second of each house transformer respectively connecting the second and third one system of secondary output side, each third and fourth each house transformer of the main transformer as well as connections to the secondary output side of the first house transformer It connects the non-priority plant load on the secondary output side of the house transformer with the second to fourth connecting priority plant load, the secondary output side of the first house transformer connected to the priority plant load The first in- house transformer was connected when the output was abnormal.
The priority local loads are arranged in a predetermined order on the secondary output side of the third or fourth local transformer connected to the secondary output side of the second or third main transformer other than the first main transformer. A method of switching power in a distribution substation, characterized in that the connection is controlled and switched. 2. A power supply system comprising: at least three first to third main transformers; a first in- station transformer connected to a secondary output of the first main transformer; wherein each of the second and the secondary output side of the third main transformer connecting the second and third house transformer, the secondary output side of the first house transformer preferentially plant load and the non-priority the together to connect the plant loading
Connect the non-priority plant load on the secondary output side of the second and third house transformer, when the first house transformer connected priority plant load secondary output side of the output abnormality, the first house The second other than the transformer
Alternatively, a priority substation load is controlled and switched to be connected to a secondary output side of a third substation transformer in a preset order in a substation power distribution substation. 3. A least three first to third main transformer, the first connected to preferentially house load on the secondary output side of one of the system integration of the two systems of the main transformer a first house transformer for connecting a second house transformer for connecting the other systems connected to the non-priority plant load on the secondary output side of the integration of said first dual of the main transformer, Oyo third respectively connecting the non-priority plant load is connected to the secondary output side of the main transformer of the second and third
Beauty and fourth house transformer, and between the second to fourth secondary output side of the house transformer of the secondary output side and Priority house load of the first house transformer and the non-priority plant load Between the second and the
Switching a switching unit, wherein when the priority institution for secondary output side of the first house transformer connected to load output abnormality, the switching device for switching connecting the secondary output side of the fourth house transformer preferentially plant load Control this
The other than the first main transformer connected to the first house transformer 2
Or the third also connected to the secondary output side of the third main transformer
A power supply unit for a distribution substation, comprising: a control unit for switching and connecting the priority local loads in a preset order to a secondary output side of the fourth local transformer. 4. A switchboard and a control section, wherein a dehumidifier is provided in a switchboard housing in which a heat shield plate is attached with a gap on an outer surface of the housing. Power supply in distribution substation.