JPH08308095A - Power distribution equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] An object of the present invention is to provide a power receiving and distribution facility in which even if a power failure occurs in one place of a line, power is supplied from another healthy line to a load that is out of power to prevent the power failure. To provide. [Structure] In the power distribution equipment of the present invention, a loop circuit and a load are connected to a loop circuit via a power receiving circuit breaker in a plurality of phase lines,
A detector connected to the load distribution unit, which has a loop circuit unit having a line in the loop circuit and a plurality of circuit breakers and a plurality of load distribution units connected to each loop circuit unit. At least one circuit breaker is opened and the other circuit breaker is closed by the detected detection signal to supply power to the load distribution unit from the other healthy line to prevent a power failure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power distribution equipment for a network, and more particularly to a plurality of load power distribution units connected to a loop circuit.

[0002]

2. Description of the Related Art Generally, a network power receiving system is often used for substation facilities in cities. For example, Japanese Patent Laid-Open No. 4-2
The network power distribution and distribution circuit proposed in Japanese Patent No. 44739 receives power from three lines from a three-phase power source substation to three lines of 22KV or 33KV, connects a network transformer with the three lines, and has a power receiving disconnection line on the primary side. Each of the network transformers on the secondary side is connected to the network bus of the loop circuit through a network protector such as a fuse or protector breaker. A plurality of load side distribution lines are connected to the load side of the network bus, and motors, lights, etc. are connected to the load side distribution lines.

[0003]

However, an accident occurs in, for example, one of the three lines, and the contact breakers arranged on both sides of the loop circuit open through the one line.
The line had a power failure, and the load on the line was unusable.

It is an object of the present invention to provide a power receiving and distributing facility which prevents power failure by supplying power to a load that has a power failure even if a power failure occurs at one point of the line.

[0005]

The power receiving and distributing equipment of the present invention comprises:
Connected to each loop circuit unit with a loop circuit that is connected to multiple-phase circuits via a power receiving circuit breaker and a loop circuit unit that has multiple phase load side circuits in the loop circuit and that is equipped with multiple communication circuit breakers The load distribution unit is equipped with multiple load distribution units, and at least one circuit breaker is opened and the circuit breaker of the other phase is closed by the detection signal detected by each detector of the load power distribution unit, causing a power failure from the healthy circuit of the other phase. To supply power to the existing load distribution unit.

[0006]

For example, since the load power distribution unit that is out of power is supplied with power from the healthy line of the other phase, power can be supplied without power failure.

[0007]

Embodiments of the present invention will be described below with reference to FIGS.

FIG. 1 is a diagram showing a spot network power receiving and distributing circuit, and FIG. 2 is a perspective view in which three switchboards containing the contents of FIG. 1 are connected through a duct.

The three-phase lines 1X, 1Y, 1Z connect the loop circuit 4 and a plurality of load side power distribution units 10 to the loop circuit 4 via network transformers 2X to 2Z.
Primary side lines 1X to 1Z of network transformers 2X to 2Z
As shown in FIG. 1 of Japanese Patent Application Laid-Open No. 4-244739, the following parts are connected to this.

22 lines of three lines from a power substation (not shown)
Power is received by the KV or 33 KV power source side bus and supplied to the primary side of the network transformers 2X to 2Z via the power receiving disconnector. Several hundred V, one on the secondary side of the network transformer
000A, and flows into the loop circuit 4 through the fuses and the power receiving circuit breakers 3X to 3Z which are protector circuit breakers. The loop circuit 4 is used as a network bus bar in the spot network power distribution equipment, and usually uses a strip conductor such as aluminum or copper.

Adjacent lines, for example, between 1X and 1Z, 1X and 1
The loop circuit 4 between Y, and between 1Y and 1Z includes circuit breakers 5X, 5Y, 5Z for multiple phases and respective disconnecting switches 6X, 6 for communication.
Loop circuit unit 4X, 4Y, 4Z provided with Y, 6Z
Is composed. In this case, each disconnecting switch 6X, 6
By arranging Y and 6Z between the connecting circuit breakers 5X, 5Y and 5Z, the cost is lower and the cost is lower than the case where two connecting circuit breakers are used adjacently. Each loop circuit unit 4X to 4Z and each circuit breaker 5X, 5Y,
The contents of 5Z and each disconnecting switch 6X, 6Y, 6Z and the power receiving circuit breakers 3X to 3Z are surrounded by the switchboard 7 shown in FIG.

The switchboard 7 is a first switchboard 7X and a second switchboard 7
Since Y and the third switchboard 7Z can be sequentially arranged, for example, from the left side to the right side of the drawing, there is an advantage that the switchboard can be compactly arranged without increasing the size as compared with the above-mentioned conventional technique.

A first duct 8Y and a second duct 8Z for connecting the first switchboard 7X and the second switchboard 7Y and the second switchboard 7Y and the third switchboard 7Z are attached. The first duct 8Y is arranged on the right side of the switchboard, and the second duct 8Z is arranged on the left side of the switchboard, offset from each other. The 3rd duct 8X which connects between the 3rd switchboard 7Z and the 1st switchboard 7X of a switchboard is attached. Third
The duct 8X has both ends arranged between the first duct 8Y and the second duct 8Z, and the first duct 8Y and the second duct 8Z.
Since the bent portion 9 that is bent to the side corresponding to one end of the third duct 8X is connected, the length dimension of the third duct 8X can be reduced. Therefore, there is an advantage that the distribution board can be compactly arranged without increasing the length as compared with the above-described conventional technique. is there.

Further, the loop circuit 4 arranged in the bent portion 9 uses a strip-shaped conductor. At a connection portion where one strip-shaped conductor and the other strip-shaped conductor are connected at a right angle, the loop circuit is inserted into a hole of the connection portion. Insert the nut into the bolt and tighten it,
Alternatively, the work is fixed by welding, but this work can be done from the outside, so it is easier to fix. Further, the bent portion 9 of the third duct 8X has a cooling effect.

Two load side regular lines 11X, 11Y, 11Z and a load side protection line 12 drawn from the loop circuit units 4X, 4Y, 4Z arranged in each switchboard.
X, 12Y and 12Z are connected to the first, second and third load side power distribution units 10X and 10Y and 10Z through a regular take-off circuit breaker 14A and a spare take-off circuit breaker 14B.

Each load side power distribution unit 10X, 10Y, 1
Since the configurations of 0Z are the same, one of them, for example, the first load side power distribution unit 10X will be described, and the description of the other configurations will be omitted. The first load-side power distribution unit 10X includes a left-side regular take-off circuit breaker 14A, a central backup take-off circuit breaker 14B, and load-side circuits 11X, 12
It is connected via Y to the normal breaker 15A and the spare breaker 15B on the load side.

The service breaker 15A is the load side line 11 of its own phase.
Connected to X-11Z, the spare breaker 15B is the other phase line 1
It is connected to 2Y, 12Z and 12X. That is, both the service breaker and the backup circuit breaker of each load distribution unit are connected to the own-phase circuit and the other-phase circuit, and the other-phase circuit is a backup circuit, and at least one of the plurality of loop circuit units, for example 4X, has a power failure. Load side power distribution unit 10
Power is supplied to X from the healthy line 12Y of the other phase.

The load-side conductor 16 connects the normal breaker 15A, the spare breaker 15B and the load-side breaker 17, and the load-side common breaker 18 is connected to the load-side conductor 16 between both breakers. A load 19 such as a motor and a lighting is connected to the side conductor end. The second load side power distribution unit 10Y includes a central service take-off circuit breaker 14A, a right side spare take-off circuit breaker 14B, and load side service circuit breakers 15A and backup circuit breakers 15 via load side circuits 11X and 12Y.
Connected to B. The third load-side power distribution unit 10Z is connected to the right-side regular take-off circuit breaker 14A and the left-side preliminary take-off circuit breaker 14B and the left-side regular circuit breaker 15A and the right-side preliminary circuit-breaker 15B via the load-side lines 11X and 12Y.

Numeral 21 is a current transformer, which detects the current and operates the overcurrent relay 51 to shut off the power receiving breaker, for example 3X, when a short circuit occurs in each line, for example, 1X. 22 inputs the undervoltage signal detected by the instrument transformer to the undervoltage relays 27A and 27B, and interrupts the service breaker 15A, for example, by the load control units 27X, 27Y, and 27Z that input this operation signal, and reserves it. Turn on the circuit breaker 15B. The load control unit 27X turns on the service breaker 15A and shuts off the backup breaker 15B during normal operation when the instrument transformer 22 detects no undervoltage. Load control unit 27X,
27Y and 27Z can also function to turn on and off both circuit breakers. Although three load control units are used independently, they may be integrated into one unit.

1) Next, the case where an accident occurs at the A1 point of the line 11X, the A2 point of the loop circuit unit 4X and the A3 of FIG. 1 will be described.

Under normal conditions, for example, all the service breakers 15A are turned on, and the spare breaker 1
Three load side power distribution units 10 with 5B shut off
Power is supplied to X to 10Z.

When an abnormality occurs at the point A1, the current from the loop circuit unit 4X flows to the accident point A1. When this fault current is detected by the current transformer 21 and the overcurrent relay 51 is operated to shut off the regular take-off circuit breaker 14A, an undervoltage is detected by the instrument transformer 22, and the undervoltage relay 27A operates. , The load control unit 27X shuts off the service breaker 15A and turns on the spare breaker 15B,
Since the power is supplied to the load side power distribution unit 10X, the load 19 does not fail.

When an abnormality occurs at point A2 Currents from the lines 1X, 1Y and 1Z flow to the fault point A2. When this fault current is detected by the current transformer 21 and the overcurrent relay 51 is operated to disconnect the communication breakers 5X and 5Z and the power receiving breaker 3X, the operation signal of the undervoltage relay 27 is sent to the load control unit 27X. The input circuit breaks the service breaker 15A, the backup circuit breaker 15B is turned on, and power is supplied to the load side power distribution unit 10X, so that the load 19 does not fail.

At this time, no electric power is supplied to the load side line 12X to the load side power distribution unit 10Z, however, since 10Z is supplied with electric power from the service line 11Z, no power outage occurs.

When an abnormality occurs at point A3 Currents from the lines 1X, 1Y, 1Z flow to the fault point A3. This fault current is detected by the current transformer 21, the overcurrent relay 51 is operated, and in addition to shutting off the circuit breakers 5X and 5Z, the power breaker 3X is shut off, and an abnormality occurs at point A2. Similarly to the case, the regular breaker 15A is shut off by 27X, and the spare breaker 15B is turned on to supply power to the load side power distribution unit 10X, so that the load 19 does not fail.

Although the load side power distribution unit 10X has been described above, other load side power distribution units 10Y, 1 are used.
It goes without saying that the same works for 0Z.

2) Further, when maintaining and inspecting the loop circuit unit 4X, that is, the first switchboard 7X, the first switchboard is opened by opening the connecting disconnectors 6Y of the loop circuit unit 4Y and the connecting disconnector 6Z of 4Z. Since 7X can be completely put into a non-voltage state, it can be safely maintained and inspected. In addition, other loop circuit units 4Y, 4
Since power is supplied to Z, all load distribution units can safely supply power without a power failure. This means that when a certain switchboard (loop circuit unit) is physically damaged, for example, in the event of an earthquake, the other switchboards (loop circuit unit) are installed independently, so the function can be maintained. There is no fear of power failure.

[0028]

As described above, according to the present invention, a circuit breaker is connected to the self-phase line and the other-phase line of each load distribution unit, and the accident detection signal detected on one side of both phase lines causes
Open one of the two-phase circuit breakers and close the other to supply power to the load distribution unit on the circuit breaker side opened from the healthy phase circuit so that power can be supplied safely without a power failure. became. Also, when a certain power receiving line and loop circuit unit is physically damaged, for example, even in the event of an earthquake, other loop circuit units are installed independently, so the functions can be maintained, so there is no fear of power failure. .

[Brief description of drawings]

FIG. 1 is a spot network power distribution circuit diagram showing an embodiment of the present invention.

FIG. 2 is a schematic perspective view of a switchboard used.

[Explanation of symbols]

1X, 1Y, 1Z ... Spot network line, 2X-
2Z ... network transformer, 4 ... loop circuit, 4X, 4
Y, 4Z ... Loop circuit unit, 5X, 5Y, 5Z ... Communication breaker, 6X, 6Y, 6Z ... Communication disconnecting switch, 8Y,
8Z, 8X ... First and second ducts, 10, 10X, 10
Y, 10Z ... Load side power distribution unit, 11X-11Z ... Load side regular line, 12X-12Z ... Load side backup line.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masayuki Kamata 1-1-1, Kokubun-cho, Hitachi-shi, Ibaraki Hitachi Kokubun factory (72) Inventor Masami Taguchi 1-1-1, Kokubun-cho, Hitachi-shi, Ibaraki No. 1 Stock company Hitachi Kokubu factory

Claims (5)

[Claims] 1. A loop circuit connected to a multi-phase circuit via a power receiving circuit breaker, and a power distribution circuit in which a multi-phase load is connected to the loop circuit, wherein the loop circuit has a circuit and a plurality of communication lines are provided. Each load distribution unit is equipped with a multi-phase loop circuit unit equipped with a circuit breaker and a multi-phase load distribution unit connected to each loop circuit unit, and the detection signal detected by the detector connected to each load distribution unit A power receiving / distributing facility, characterized in that at least one circuit breaker connected to is opened, the other circuit breaker is closed, and power is supplied to the load power distribution unit from the other healthy line to prevent a power failure. 2. A common and standby load distribution unit is connected to each of the plurality of loop circuit units, and a common circuit breaker is opened and a preliminary circuit breaker is closed by a detection signal detected by a detector of the common and preliminary load distribution unit. The power receiving and distribution facility according to claim 1, further comprising a load controller. 3. The power distribution equipment according to claim 1, wherein a connection disconnecting switch is provided adjacent to the connection circuit breaker of each loop circuit unit. 4. A loop circuit connected to a three-phase line via a power receiving breaker and a power distribution circuit having a plurality of phase loads connected to the loop circuit, wherein the loop circuit has a line and a plurality of communication lines are provided. A three-phase loop circuit unit provided with a circuit breaker is provided, the contents of each of the loop circuit units are surrounded by a switchboard, and a plurality of switchboards are arranged at predetermined intervals, and an intermediate switchboard and left and right switchboards adjacent to the switchboard are provided. Is connected by the first and second ducts, and the left and right switchboards are connected by the third duct arranged between the both ducts. 5. An intermediate switchboard and left and right switchboards adjacent to the switchboard are connected by first and second ducts that are offset from each other in the front and rear directions, and are arranged between the offset first duct and the second duct. The power distribution equipment according to claim 4, wherein the bent portions of the third duct that are bent forward and backward are connected to each other by the left and right power distribution boards.