JP3432587B2 - Power supply for mobile - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low-voltage distribution line and an improved mobile power supply device capable of performing uninterruptible switching and switching back.

[0002]

2. Description of the Related Art As a mobile power supply device for performing uninterruptible relief of a corresponding load group on behalf of a regular power supply, by performing uninterruptible switching and switching back to a low voltage distribution line after a secondary side of a pole transformer. An uninterruptible switching power supply vehicle having a function based on Japanese Utility Model Publication No. 5-8766 is used.

The power supply vehicle described in the embodiment of the above publication adopts a three-phase three-wire system for high-voltage use, but a low-voltage power supply vehicle is compatible with a three-phase four-wire system having the largest number of output phases. The output method (three-phase three-wire, single-phase three-wire, etc.) can be handled by not connecting a cable to a certain specific phase, so the output side of the power supply car usually adopts the three-phase four-wire output method. You can leave it.

From this viewpoint, FIG. 2 shows an example of a conventional low-voltage power supply vehicle compatible with low-voltage three-phase four-wire output. Figure 2
In FIG. 1, the same parts as those in FIG. 1 are designated by the same reference numerals, and the power supply side connection cable PCA includes a cable for connecting to the ground phase LV4, and the power supply side connection cable PCA and the power supply side connector PCN are each four. Will be needed. Further, the bypass circuit BPC in the power supply vehicle IDO is also a four-wire type, and the bypass side circuit breaker 52B also needs to have four poles. Further, in the conventional power supply vehicle, in order to obtain a three-phase four-wire output, a three-phase four-wire generator power supply AGD is used, for example, a three-phase alternating current generator composed of a delta connection, and an intermediate tap is formed from one phase winding of the delta connection. It is pulled out and the tap is used as the ground phase when outputting three-phase four-wire.

[0005]

As is apparent from FIG. 2, in order to smoothly perform uninterruptible switching and switching back and forth between the two power sources, the three-phase four using the distribution line side and, for example, a delta connection generator is used.
In the case of the three-phase four-wire type, the power supply side connection cable that is connected between the power supply cars consisting of the line power generation power supply is four on the power supply side and four on the load side.
It was necessary to make a live connection of a total of eight books. However, in the operation of the low-voltage power supply vehicle, the most troublesome work is the above-mentioned live connection of the connection cable. This work is to pay out the cable, pull it up on the pole, connect live wire to the distribution line, withdraw,
It is the most labor-intensive task for those who take up the cable, store it in the power supply car, and perform the work. For this reason, the operator wants to reduce the above work as much as possible. Normally, the cables used in the above power supply vehicles are single-core and have a length of 20-
The length is 30 meters and the size is about 38 to 80φ, and it is preferable from the viewpoint of design to reduce the number of cables used as much as possible from the viewpoint of mounting and storing such a cable in a power supply vehicle. This is because the power supply vehicle can be made smaller, lighter, and less economical.

The present invention has been made in view of the above circumstances, and it is intended to reduce the number of connected live line connecting cables connected in a three-phase four-wire system for common use of lights and to simplify a bypass circuit drawn into a power supply vehicle. It is an object of the present invention to provide a moving power supply device.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a first aspect of the present invention, in which a three-phase four-wire type distribution line for common lighting is switched to an uninterruptible state to temporarily switch to another power source. In the one that rescues the uninterruptible rescue load group using, while connecting the one end of the live line connection cable to the power supply side and the load side of the distribution line, sandwiching the rim cutting / reconnection part provided in the distribution line,
The number of the cables is one less on the power supply side than on the load side, and a bypass circuit of the distribution line, a three-phase AC generator, and a synchronous input are provided in the mobile power supply vehicle to which the other end of the cable is connected. A load transfer device is provided, the bypass circuit is formed in a three-phase three-wire system, and the output of the three-phase AC generator is supplied to the load-side hot-line connecting cable via a power-generation side circuit breaker, and An autotransformer with an intermediate tap is provided on the load side of the power-generation side circuit breaker, and the tap output of the transformer is supplied to the ground phase of the load-side hot-line connecting cable.

A second aspect of the present invention uses the three-phase AC generator as a three-phase three-phase generator.
It is characterized by comprising a linear output.

A third aspect of the invention is to use three power source side connecting cables,
It is characterized in that there are four load side connection cables.

[0010]

[Function] Since the autotransformer with an intermediate tap is installed on the load side of the breaker on the power generation side of the three-phase AC generator, the balancer function of the autotransformer is used to reduce the number of connecting cables on the power supply side. The number of connecting cables can be reduced.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, HV is a high-voltage distribution line of, for example, 6.6 kV, and this high-voltage distribution line HV is connected to the primary side of the pole transformer TF via a primary cutout switch PCS. The secondary side of the transformer TF is connected to the low voltage power distribution system LV of the three-phase four-wire type for both lighting and lighting. In this distribution system LV, LV1 is a power-only phase, LV2 and LV3 are common lighting phases, and LV4 is a ground phase. The part indicated by X in each phase is the edge cutting / reconnection part SW. LR is a three-phase load group,
LO1 and LO2 are single-phase load groups, both of which are targets of uninterruptible relief.

The IDO is an uninterruptible switching mobile power supply car, and the power supply car IDO is constructed as follows.

ENG is a prime mover, and this prime mover ENG is connected to a three-phase AC generator AG via a coupling CP. This generator AG has a three-phase three-wire output consisting of a star connection, which is a standard connection method, and has an instrument transformer P on the output side.
T and an instrument current transformer CT are provided, and the output end thereof is connected to the load side connector FCN via the power generation side circuit breaker 52G.
Connected to. There are four load-side connectors FCN, three of which are power-only phase LV1 and common lighting phase LV2, LV
3 is connected using the load side connection cable FCA for hot line connection, and the remaining one is connected to the ground phase LV4 using the load side connection cable FCA.

An autotransformer AT with an intermediate tap is connected between the two lines connected to the load-side common lighting phases LV2, LV3 of the power-generation side circuit breaker 52G, the intermediate tap of which is the ground phase LV4.
Is connected to the load side connector FCN. PC
N is a power supply side connector made up of three parts, and this connector PCN has a power dedicated phase LV1 and a lighting common phase LV2, L
A power supply side connection cable PCA that is hot-connected to V3 is provided. Power connector PCN and load connector FCN
A bypass circuit BPC (a portion surrounded by a broken line in the drawing) is provided between the and. The bypass circuit BPC is provided with a bypass side circuit breaker 52B.

BMM is a bypass circuit side electric quantity measuring means, and the electric quantity of the bypass circuit BPC is taken in from the measuring instrument transformer PT1 and the measuring instrument current transformer CT1 to the measuring means BMM. SYF is a synchronous closing / load transfer device, and this device SYF takes in the amount of electricity from the instrument transformer PT2, and is connected to the bypass circuit side electricity amount measuring means BMM and the power generation side electricity amount measuring means GMM. The generator-side electricity quantity measuring means GMM is connected to an instrument transformer PT and an instrument current transformer CT, and the electricity quantity is taken in from these.
GOV is a speed governor. AVR is an automatic voltage regulator.

Next, the operation of the above embodiment will be described. Place an uninterruptible switching mobile power supply vehicle IDO at a location where uninterruptible construction will be performed,
One end of the three power supply side connecting cables PCA is live-connected to the power-dedicated phase LV1 and the common lighting phase LV2, LV3 across the edge-cutting / reconnecting part SW, and four live cables are connected to the load side. One end of the load side connection cable FCA for wire connection is connected to all the phases. The other ends of the power supply side connection cable PCA and the load side connection cable FCA are connected to the power supply side connector PCN and the load side connector FCN of the power supply vehicle IDO. After making the above connection to the power supply vehicle IDO,
When the bypass side circuit breaker 52B is turned on and then the rim cutting portion SW is cut off, a three-phase three-wire bypass circuit BPC is formed in the power supply vehicle IDO. At this time, single phase 100V
A normal voltage is applied to the load groups LO1 and LO2 by the balancer action of the autotransformer AT with an intermediate tap provided in the power supply vehicle IDO, and the single-phase 100V load group LO is applied.
The ground phase current based on the imbalance of 1, LO2 is also supplied by the autotransformer AT. Here, the three-phase AC generator AG is started, and the bypass circuit BPC is synchronously turned on by the power generation side circuit breaker 52G. After the load is transferred from the bypass side circuit breaker 52B side to the power generation side circuit breaker 52G side, the bypass side circuit breaker 52B is opened. As a result, the three-phase AC generator A
It becomes G's independent operation and power is supplied to the load by three-phase four-wire output.
The single-phase load groups LO1 and LO2 are in the operating state while applying a normal voltage by the action of the balancer of the autotransformer AT in the power supply vehicle IDO. After each load group is fed from the power supply vehicle IDO, the primary cutout switch PCS is opened, and, for example, work on the distribution line side such as replacement work of the pole transformer TF is performed.

In the above work, when the power supply side connection cable PCA is removed due to the work on the distribution line side, the cable PCA is reconnected. After connecting,
By giving a synchronous closing command to the bypass circuit breaker 52B and synchronizing control of the AC generator AG that is supplying power to the load,
The circuit breaker 52B turns on the pole transformer TF secondary side voltage in synchronization. Then, the load is transferred from the generator side to the bypass circuit side. It should be noted that a normal voltage is always applied to the single-phase 100V load groups LO1 and LO2 by the action of the balancer of the autotransformer AT, and the single-phase 100V load group L is also applied.
The ground phase current based on the imbalance of O1 and LO2 is also supplied from the autotransformer AT.

When the power-generation side circuit breaker 52G is opened, the three-phase power is supplied from the secondary side of the pole transformer TF through the bypass circuit BPC, and the single-phase 100V load group LO is supplied.
The voltage applied to 1, LO2 and the ground phase current are continuously supplied to the load side as a normal three-phase four-wire power supply by the action of the autotransformer AT. Next, connect the distribution line edge cutting portions SW in order from the ground phase side, and when the distribution line reconnection is completed, open the bypass side circuit breaker 52B and remove the power supply side connection cable PCA and the load side connection cable FCN. Then, the power supply is cut back to the secondary side of the pole transformer TF.

By configuring the uninterruptible switching mobile power supply vehicle as described above, the number of connection cables mounted on the power supply vehicle can be reduced from eight to seven, so that the size of the vehicle can be reduced. It is possible to reduce the size of the power supply vehicle.
Also, the cable connection work (all the cable handling such as unwinding from the cable drum, winding, connection preparation and withdrawal work) in a live state between the power supply car and the distribution line can be reduced to a ratio of 7/8. Further, for example, a delta connection generator that constitutes a conventionally used three-phase four-wire power generation source is
Due to the generator design, to prevent circulating current in the delta connection,
There was little freedom in design and a special design was required. On the other hand, as the three-phase three-wire output generator used in this embodiment, many standard star connection standard products can be applied, and an autotransformer with an intermediate tap conforming to this specification can be used. It only needs to be provided on the load side of the power-generation side circuit breaker.

In the embodiment of FIG. 1, the ground phase floats from the ground potential if there is no connecting ground point on the load side after cutting at the edge cutting portion SW of the ground phase LV4 on the low voltage distribution system side. In order to prevent this, it may be possible to cope with this by equipping the power source vehicle with a mechanism capable of grounding a predetermined ground phase.

[0021]

As described above, according to the present invention,
In an uninterruptible switching power supply vehicle compatible with three-phase four-wire system for common lighting,
The main circuit connecting cable for live connection to the distribution line requires only seven cables, and the bypass circuit to be drawn into the power supply vehicle also requires three wires, which is an advantage that it can be simplified.
Since the bypass circuit requires only 3 wires, the bypass circuit breaker can use the standard 3 poles, facilitating the assembly work and reducing the size of the control panel equipped with the power supply vehicle. it can.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a configuration diagram showing a conventional example.

[Explanation of symbols]

LV ... Low voltage distribution system SW: Edge cutting / reconnecting section IDO ... Uninterruptible switching mobile power supply car PCA ... Power supply side connection cable FCA ... Load side connection cable BPC: Bypass circuit BMM ... Bypass circuit side electric quantity measuring means SYF ... Synchronous loading / load transfer device GMM: Means for measuring electricity on the power generation side AT ... autotransformer with intermediate tap AG: Three-phase AC generator 52G ... Power side circuit breaker 52B ... Circuit breaker on bypass side

Front page continued (72) Inventor Isamu Sudo 2-1-117 Osaki, Shinagawa-ku, Tokyo Meidensha Co., Ltd. (56) References JP-A-4-58797 (JP, A) JP-A-1-209927 (JP , A) Actual development Sho 62-33643 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02J 9/00-11/00 H02J 3/00-5/00

Claims (3)

(57) [Claims] Claim: What is claimed is: 1. An uninterruptible switching of a three-phase four-wire type distribution line for shared use of lights and a temporary restoration of the uninterruptible rescue load group by using another power source, wherein an edge cut provided on the distribution line.・ Connect one end of the live line connecting cable to the power supply side and the load side of the distribution line across the reconnection part, and configure the number of cables to be one less on the power supply side than on the load side. , A bypass circuit of a distribution line in a mobile power supply vehicle to which the other end of the cable is connected,
A three-phase AC generator and a device for performing synchronous closing and load transfer are provided, the bypass circuit is formed in a three-phase three-wire system, and the output of the three-phase AC generator is connected to the load side via a power generation side circuit breaker. An autotransformer with an intermediate tap is provided on the load side of the power-generation side circuit breaker, and the tap output of the transformer is supplied to the ground phase of the load-side liveline connection cable. A mobile power supply device characterized by the above. 2. The mobile power supply device according to claim 1, wherein the three-phase AC generator is a three-phase three-wire system. 3. The moving power supply device according to claim 1, wherein the power supply side connection cable is three, and the load side connection cable is four.