JPH08226951A - Power source direction display unit for high-voltage power distribution line - Google Patents

Abstract

PURPOSE: To rapidly discover a ground-fault accident point and to improve the operat ing safety by providing means for detecting the phase current and the phase voltage of a high-voltage power distribution line, means for discriminating a power source direction according to the phase difference between the phase voltage and the phase current, and means for always displaying the direction according to the output of the discriminating means. CONSTITUTION: A zero-phase voltage is detected by a zero-phase voltage detecting capacitor 6. A zero-phase current is detected by a zero-phase current transformer 23. A phase comparator 24 compares the phase differences of the detected zero-phase voltage with the detected zero-phase current, decides the presence of a ground-fault accident at a load side if the range falls in a predetermined range, and decides the absence of the accident at the load side if the compared phase difference is out of a predetermined range. If the comparator 24 decides the presence of the accident, the display lamp 25 of a display circuit 26 is lit, while if the comparator 24 decides the absence of the accident, the lamp 25 remains no-lighting. At the time of normal conducting, there is no malfunction at a line at the one ground-fault direction display side and non-operating state, and hence the lamp 25 is in the non-lighting state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply direction display device which is integrated with a switch, combined with a ground fault direction display device, or used alone in a high-voltage power distribution line.

[0002]

2. Description of the Related Art The loop-shaped power distribution line shown in FIG. 9 connects the circuit breakers 100-1, 100-2 for distribution line, the first and second branch lines 102, 103, and both branch lines. Loop switch 104, an automatic switch 105-1 to 105-7 with an accident section detection device for dividing both branch lines, a manual switch 106 for further dividing each section, and the like. Ordinarily, the substation (power supply) 115 and the main line 107 during normal times
Power is transmitted to each of the branch lines 102 and 103 via. However, in the above-mentioned distribution line, the loop switch that is always open is used for load accommodation, reducing the power outage range during construction,
It is closed manually or automatically due to an accident. That is, in the above distribution line, the power transmission state is forward-reverse, reverse-
It can be switched to progressive delivery. Therefore, the display state of the ground fault direction display device installed in the fault section 108 separated due to the occurrence of the ground fault is different between the forward transmission and the reverse transmission, although the accident point is the same. There is.

That is, in the progressive transfer state shown in FIG. 10, the display devices 109-1 to 109 located closer to the power source than the accident point A are.
-3 is lit up, and the display devices 109-4 to 109-6 located on the load side from the accident point A are non-illuminated displays, and the accident point A is the display device 109 adjacent to the accident point A in the display state. -3 and the display device 109-4 in the non-display state adjacent to the accident point A are displayed. In the case of the reverse feeding state of FIG. 11, the display devices 109-4 to 109-6 installed on the power supply side from the accident point A are lit up and displayed, and the display devices 109-1 to 109 installed on the load side from the accident point A are displayed. -3 is a non-lighting display.

In other words, the forward lighting and the reverse shipping differ in the lighting state of the indicator lamp although the accident point is the same. Next, in addition to the above ground fault direction display device, FIG.
In the congested distribution line network as shown in Fig. 5, the interconnection switch to be connected to another adjacent distribution line is manually operated for the purpose of accommodating load load on the distribution line 110 and reducing the blackout range of the line. It is operated to perform reverse power transmission. That is, FIG.
2, when an accident occurs at the accident point B, the interconnection switches 113, 114 are closed and the adjacent separate distribution line 111,
Reverse power transmission is performed from 112 to a healthy section. B and B indicate the range of support from adjacent distribution lines.

[0005]

Technical Problem to be Solved In the case of the former ground fault direction display device, an operator rushing to the site moves along the distribution line while watching the lighting (non-lighting) state of the display device. When conducting an exploration, if the power transmission direction of the distribution line, that is, the direction of the power source is not known, it may move in the direction opposite to the accident point and the accident point exploration may not be performed quickly.

That is, if the accident section in which the accident has occurred is long or congested, a large number of track display devices are installed, so that the operator moves to either side from the installation position of the display device that arrived first. Sometimes I don't know if I should do it. In other words, if both display devices on both sides adjacent to each other have the same display state, or if they do not recognize that the distribution line is in the reverse transmission state, whichever display device is installed first There is a problem that the accident point cannot be found promptly because there is no doubt whether the exploration should be started on the side.

In the latter case, when the load is interchanged from the adjacent distribution line of another power source by the switching operation of the interconnection switch, the power transmission state of the distribution line on the side of the interchange is from forward transmission to reverse transmission. If a worker on site does not know that the switch has been switched to, the switch or the like may be erroneously operated, and a problem such as a trip accident at a substation (power supply) due to a match of different power supplies may occur.

[0008]

The present invention is to solve various problems caused by the fact that an operator cannot visually confirm the direction of the power source at the site of the high-voltage power distribution line. The first invention is the first invention. Are detection means (4), (6) for detecting the phase current and the phase voltage of the high-voltage distribution line (3).
A discriminating means (5) for discriminating the power source direction by the phase difference between the phase voltage and the phase current, and a display means (8) for constantly displaying the power source direction by the output from the discriminating means (5). The present invention proposes a power supply direction display device for a high-voltage wiring line.

According to a second aspect of the invention, holding means (9), (10), (11), (12) for holding the display state before the power transmission is stopped on the display means (8) continuously. ) Is provided, the power supply direction display device in the high-voltage wiring line according to claim 1 is proposed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A power supply direction display device of the present invention will be described below with reference to FIGS. In FIG. 1, 1
Is a power source direction display device of the present invention installed on the high-voltage power distribution line 2, 3 is a 3-phase high-voltage power distribution line, 3u is a U-phase power line, 3
v indicates a V-phase electric wire and 3w indicates a W-phase electric wire. 4 is U
It is a current transformer for detecting the phase current flowing in the phase wire,
The output terminal is input to the discrimination circuit 5 for discriminating the power supply direction. Reference numeral 6 denotes a detection capacitor for detecting the phase voltage, which includes a capacitor 6-1 and a capacitor 6-2.
Connected in series, one end is connected to the U-phase distribution line 3u and the other end is grounded, and the output from the coupling point of both capacitors is input to the amplifier circuit 7, and the amplified output is further input to the discrimination circuit 5 described above. I am trying to type in. Reference numeral 5 denotes a power supply direction determination circuit as described above, which determines the power transmission direction, that is, the power supply direction based on the phase difference θ between the phase current and the phase voltage input to the circuit 5. For example, the phase difference θ is −
70 ° to 110 °, that is, a delay of 70 ° leads to 110
When it is in the range of °, it is determined that the power supply direction is the forward direction, and when it is in the range of 110 ° to 290 °, that is, in the range of 110 ° to 290 ° in advance, it is determined that the power direction is the backward direction. It is like this.

Reference numeral 8 denotes a display circuit, which is a display output unit 9 for displaying that the direction is the power supply direction in the forward direction.
And a display output unit 10 that indicates that the direction is the power supply direction in the case of the reverse feeding direction, and further displays when power transmission is stopped (power failure) to each of the two display output units 9 and 10. Storage units 11 and 12 that output a set signal that enables the body to maintain the display state before the stop are provided.
The storage units 11 and 12 lock the display state of the display bodies 13 and 14 made of magnetic drive plates at the same time when the power transmission is stopped, and the display bodies are displayed before the power failure until the next power transmission is restarted. The display state is maintained so that the worker who arrives at the site after the power transmission is stopped can visually confirm the display state.

During power transmission, a reset signal is issued from the storage units 11 and 12 to unlock the display. In addition to this, a light emitting diode or the like is used as the display unit as the storage unit and the display output unit, and the storage unit uses a timer to display the time required for the exploration time, for example, about 90 minutes to display the state before the power failure. There is also a configuration in which the display body and the like are automatically returned when power transmission is restarted after a predetermined time has elapsed and the power source direction is displayed again. Reference numeral 15 denotes a power supply unit, which includes a current transformer 16 connected to the W-phase distribution line 3w, a storage battery charging unit 17 and a storage battery unit 18 charged by the current transformer 16, and the power supply unit 15
Is for driving each unit and at the same time operating the storage unit of the display circuit, the latch relay of the display output unit, the timer, the display body and the like when power transmission is stopped.

One of the two display bodies 13 and 14 is always in a display state. For example, when the display body 13 located in the arrow 19 is red as shown in FIG. 19 indicates that the pointing direction is the power supply side direction, and at this time, the display body 14 in the arrow 20 in which the pointing direction is opposite is in a white state and represents a non-display state.

Next, the operation of the power supply direction display device 1 having the above structure will be described. When the power source (power transmission) direction is forward, and the power source is located on the left side in FIG. 1, the output from the determination circuit 5, that is, the phase difference θ is within the range for determining the forward direction, so the determination circuit The signals 5 to 1 are output, the same signal is input to one display output unit 9 of the display circuit 8, and the display body 13 is operated to display. The display body 13 thereby becomes red, and the power supply direction is the left side in FIG. It indicates that it is (to the left).

The signal 1 output from the determination circuit 5 is also input to the other display output unit 10 via the inverting unit 30, but is inverted by the inverting unit 30 and the signal becomes zero.
As shown in FIG. 2, the display body 14 for instructing that the power source is directed to the right remains undisplayed in white.

When the power supply (power transmission) direction is reverse feed and the power supply is located on the right side in FIG. 1, the output from the determination circuit 5, that is, the phase difference θ is within the range for determining the reverse feed direction. Therefore, the output from the determination circuit 5 becomes zero, the display output unit 9 does not operate, and the display body 13 remains white, which is not displayed. The zero signal is also input to the other display output section 10 via the inverting section 30, but is inverted by the inverting section 30 to become a 1 signal, and the 1 signal is input to the display output section 10 for display operation. , This time, the display 14 turns red.

In this case, since the power distribution line is in the power transmitting state, the two storage units 11 and 12 are connected to the display output units 9 and 10.
Reset signals are issued to the display body 13,
When the lock of 14 is released, the display state of the display body becomes free, and the display operation is performed according to the output signal of the determination circuit 5. Further, when power transmission is stopped from the power transmission state to a power failure state, a set signal is output from the storage units 11 and 12 to the display output units 9 and 10, and the display state before the power failure is retained. Then, when power transmission is restarted, a reset signal is output from the storage units 11 and 12 instead of the set signal, so that the display bodies 13 and 14 are unlocked, and the display state of the display bodies becomes free again and the determination circuit It is displayed corresponding to the output of 5.

Next, referring to FIG. 3, the display device 1 of the present invention is described.
The structure of a ground fault direction display device 21 with a power source direction display, which is integrally combined with the known ground fault direction display device, will be described.

In the figure, the ground fault direction display portion is, as is well known, a zero-phase voltage detecting capacitor 6 for detecting a zero-phase voltage.
And a zero-phase current transformer 23 for detecting a zero-phase current, and the phase difference between the detected zero-phase voltage and zero-phase current are compared, and if the range is within a predetermined range, it is determined that a ground fault has occurred on the load side. If the phase difference determined and compared is outside the predetermined range, it is determined that there is no fault point on the load side, and the phase comparison circuit 24.
When it is determined that there is an accident, the indicator light 25 (34) is turned on, and when it is determined that there is no accident, the indicator light 25 (3) is displayed.
In addition to the display circuit 26 for keeping 4) unlit, a zero-phase current detection circuit 27, a phase inversion circuit 28 and the like are included. Note that the description of the power supply direction display device portion of the present invention will be omitted because it is redundant in the description.

Next, the display device 21 having the above structure will be described with reference to FIG.
The operation will be described with reference to FIGS. At the time of normal energization, one of the ground fault direction display sides has no abnormality in the line and is in an inoperative state, so that the indicator lamp 25 (34) is in an unlit state. Also,
On the power supply direction display side, for example, the power supply (power transmission) direction is forward,
When the power source is located on the left side of the figure, the display 13 is red,
The display 14 remains white, indicating that the power supply is on the left side.

Next, the operation and search method when a ground fault occurs will be described with reference to FIGS. First, the ground fault direction display device side will be described. As described above, due to the occurrence of the ground fault accident, the automatic section switches 30-1 and 30-2 for detecting the accident section adjacent to the accident point C are opened and locked respectively, the section is detected, and the accident section 45 is the power source. Although it is separated from 32, in the power transmission state immediately before the disconnection,
As shown in FIG. 4, the indicator lights 34-1 to 34-3 on the side of the direction display device installed between the power source (substation) 32 and the accident point C.
Lights up because they are installed on the power supply side from accident point C.

Further, all the indicator lights 34-4 to 34-6 on the side of the display device installed on the load side after the accident point C are not turned on. Therefore, it is first determined that the accident point C is on the line between the lit indicator light 34-3 and the unlit indicator light 34-4.

The power supply direction display device side of the present invention is:
Regardless of before and after the position of the accident point C, all of the display bodies 13-1 to 13-6 installed in the section display the power source direction. That is, the detected phase current and phase voltage are input to the power supply direction determination circuit 5, and the phase difference θ between the two is determined to be the forward direction, that is, the power supply direction. The display 13 is output to the display output unit 10, and the display 13 of the magnetic drive plate whose left side is the power supply direction is reversely driven to be in a red display state.

Further, one output signal from the judgment circuit 5 is inputted to the other display output section 10 through the inverting section 30 and becomes zero, so that the display body 14-1 which indicates that the power supply direction is rightward. All 14-6 are hidden. Further, when the power distribution line is in the power transmission state, the display body continues the display state in accordance with the output of the determination circuit 5 as described above, and when the power transmission is stopped, the storage unit 11 causes the display output unit 9 to display. On the other hand, a set (lock) for holding the display body in the display state.
A signal is output, and the display bodies 13-1 to 13-6 maintain the leftward display state before the power failure. Further, a set signal is also output from the storage unit 12 to the other display output unit 10, and the display bodies 14-1 to 14-6 continue the non-display state before the power failure.

That is, the display device 21 in the accident section is in the display condition shown in FIG. 4, and after the worker rushes to the accident section, the indicator light 34 (25) on the ground fault display side of the display device at the installation location is displayed. ), If it is lit, the worker first knows that there is an accident point on the load side from the installation position.

Therefore, if the worker next looks at the display bodies 13 and 14 on the power supply direction display side and displays them in the leftward direction, the left side is the power supply and the right side is the load side, so the adjacent right side display device. Move to and find the unlit indicator. If the lit indicator light 34-3 and the non-displayed indicator light 34-4 are found, the accident point C is between the two indication lights, and the line between them is inspected in detail to identify the accident point C. Discover.

Further, when the indicator light on the side of the first ground fault device that has arrived is not lit, it is known that the accident point C is further on the power source direction side, so that the display unit of the power source direction display device of the same device. Looking at the display conditions of 13 and 14, since the power supply direction is displayed to the left, it moves to the adjacent display device on the left side of its installation position, and if the indicator light of the ground fault display device of the device is on. The accident point C can be found in the same manner as above.

Further, when power is transmitted from the power source 41 as shown in FIG. 5, the lighting direction of the ground fault display lamp is also reversed at the same time that the power source is in the reverse direction of the forward transfer. By conducting an exploration, the accident point C can be found.

That is, it is possible to know whether the accident point is the power source side or the load side by looking at the indicator light on the ground fault direction display side, and then the exploration (movement) direction can be seen by the power source direction display side. Accidental point exploration will be possible without waste.

The display portion of the ground fault direction display device 21 with the power source direction display is as shown in FIG. 6, and the display lamp 34 (25) on the ground fault direction display side and the display body 1 on the power source direction display side are shown.
3 and 14 and arrows 19 and 20 indicating the direction of the power source, (a) shows no ground fault on the load side, the power source is on the left side, (b)
Indicates that the ground fault is on the load side, the power source is on the left side, (c) is the ground side on the load side, the power source is on the right side, (d) is the ground side on the load side, and the power source is on the right side. There is. .

Next, FIG. 7 shows an embodiment in which the display device 1 of the present invention is attached to the interconnection switches 113 and 114.
It is possible to visually check the power supply direction and the presence or absence of energization in the interconnection switch, so that accidental disconnection or revertive operation is not possible during load interchange.

Further, FIG. 8 shows a power supply direction display device 1 of the present invention provided in multi-circuit switches (pull-in switches) 35-1 and 35-2 used for an underground distribution line. The line switch 36-from the load side to the power supply side when visually confirming the power supply direction and the energized state by the display device
It does not accidentally open 1, 36-2. Reference numerals 37-1 and 37-2 denote line switches that switch from the power supply side to the load side during reverse feeding, and 38 to 41 denote high-voltage switches with SOG that reach a high-voltage consumer, for example.

[0033]

The power source direction discriminating display device of the present invention has the above-mentioned configuration, and the power source direction discriminating display device of the device and an existing (conventional) ground fault directional display device for lighting and displaying in the event of a load side accident. When combined with the display function, it is possible to find out in which direction the display device in the fault (detection) section can be searched by the rushing worker, so it is possible to search in either direction. Can be done quickly.

Further, if the power source direction discrimination display device of the present invention is installed in an interconnection switch installed between adjacent distribution lines for the purpose of load accommodation, etc. Since the direction of the power source can be known and the current can be visually confirmed to be flowing in the line, the worker can accurately and safely perform the disconnection and the switching back of the switch on the site.

Further, in a switch equipped with a large number of circuits such as an underground multi-circuit switch or a switch for pulling in, if a facility is installed in the same manner as described above, a high voltage for erroneously opening and branching the line switch on the power source side It does not stop power transmission to customers.

[Brief description of drawings]

FIG. 1 is a block diagram showing a circuit configuration of a power supply direction display device of the present invention.

FIG. 2 is an enlarged view of a display portion of the display device of FIG. 1, in which a power source is displayed in a left direction and a right direction is in a non-display state.

FIG. 3 is a block diagram showing a circuit configuration of a ground fault direction display device with a power source direction display.

FIG. 4 shows an operation state of the display device when the power source is on the left side (forward power transmission).

5 shows an operating state of the display device when the power source is on the right side (reverse power transmission) opposite to that of FIG.

FIG. 6 is an enlarged view of a display portion of a ground fault direction display device with a power direction display, in which (a), (b), (c) and (d) show different display examples.

FIG. 7 shows an embodiment in which the display device of the present invention is provided in an interconnecting switch which is opened / closed for load accommodation and the like.

FIG. 8 shows a case where the display device of the present invention is provided in a high-voltage multi-circuit switch (pull-in switch) installed in an underground power distribution line.

FIG. 9 shows a known loop-shaped distribution line.

FIG. 10 is an enlarged view of the accident section in FIG. 9, and shows an operation state of the ground fault direction display device installed on the line in the power supply direction (forward power transmission).

11 is a diagram showing an operation state of the display device when reverse power transmission is performed from the state of FIG. 10 and the power source direction is the opposite right side.

FIG. 12 is a schematic diagram of a high-voltage distribution line network showing a state of load accommodation between adjacent distribution lines.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Power supply direction display device 3 High voltage distribution line 4 Current transformer as phase current detection means 5 Judgment circuit as power supply direction determination means 6 Capacitor for detection as phase voltage detection means 8 Display circuit as display means 9, 10 Holding means Output unit 11 and 12 Storage unit 13 and 14 Display unit 25 and 34 Indicator light

Claims (2)

[Claims] 1. A detection means (4), (6) for detecting a phase current and a phase voltage of a high-voltage distribution line (3), and a discrimination means for discriminating a power source direction based on a phase difference between the phase voltage and the phase current. A power supply direction display device in a high-voltage wiring line, comprising: (5) and a display means (8) for constantly displaying the power supply direction by the output from the discrimination means (5). 2. The display means (8) has a holding means (9) for continuously holding the display state before the power transmission is stopped, after the power is stopped.
(10), (11), (12) is provided, The power supply direction display apparatus in the high voltage wiring line of Claim 1 characterized by the above-mentioned.