JPH11326420A - Phase detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily discriminate each phase of a power-transmission line even in two sites separated by a long distance, to quickly and surely discriminate each phase, to eliminate use of a megaringfilter, to conduct phase detecting work of high safety, and to reduce labor and a time required therefor. SOLUTION: This detector for a power-transmission line is a detector for measuring insulation resistance and for discriminating respective phases in a stopped three-phase transmission line 3, disposed respectively in a substation and a transmission line pylon connected by the power transmission line 3 each other separatedly with a long distance, and a direct current due to a battery for a signal 11 is superposed to each phase of the transmission line 3 to be served as a transmission signal. The respective phase discrimination, disconnection and grounding for the transmission line 3 are determined in the respective two sites by answer-back for conducting transmission of the transmission signal from the pylon to the substation and reception of the signal in the substation, and transmission of answer-back signal from the substation to the pylon based on the reception of the transmission signal and reception of the answer-back signal in the pylon, with a prescribed time interval in predetermined order as to the respective phases.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a phase detector and relates to two points which are connected to each other by a power transmission line and are distant from each other, for example, a suspended three-phase power transmission line installed between a substation and a power transmission tower. The present invention relates to a phase detector for measuring insulation resistance and identifying each phase.

[0002]

2. Description of the Related Art In general, for a three-phase transmission line installed between a substation and a transmission tower, the work of measuring insulation resistance between each phase line and the ground and performing each phase identification (phase detection) on a regular basis. To be implemented. This operation is performed on the three-phase transmission line that is stopped between the substation to be phased and the transmission tower, and the stopped three-phase transmission line.

Conventionally, a mega-ring filter has been used to measure the insulation resistance between each phase of a transmission line and the ground and then identify each phase. Generally, two parallel three-phase transmission lines are installed between the substation and the transmission tower, and even when one line is stopped in this two-line parallel transmission line. If the other line is in a charged state, an induced voltage from the other line is generated in the stopped transmission line, so the insulation resistance of the stopped three-phase transmission line cannot be directly measured by a megameter. .

The above-mentioned mega-ring filter is a high withstand voltage filter that can withstand an induced voltage. Even if an induced voltage is generated in a stopped three-phase transmission line, the induced voltage is attenuated to insulate the three-phase transmission line. Enables resistance measurement. This mega-ring filter is composed of a storage box containing components including a circuit including a three-stage L-shaped filter and a mega connection terminal, and an insulating rod. A hook is provided at the distal end of the insulating rod, and an earth clip is provided at the proximal end. Respectively.

[0005] In the operation using the mega ring filter, first, with a grounding clip at the base end of the insulating rod grounded, hook the hook at the distal end of the insulating rod on the transmission line to be measured. Stop. On the other hand, if a mega measuring device is connected to a mega connecting terminal provided in the storage box, the insulation resistance of the transmission line can be measured by the mega measuring device.
That is, the induced voltage of AC is removed by a mega ring filter, the DC voltage is applied to the ground, the DC current flowing at that time is detected, and the insulation resistance is measured. Since the internal resistance of the mega ring filter is adjusted to 2 MΩ, if 2 MΩ is subtracted from the value measured by the mega measuring device, it becomes the insulation resistance value of the transmission line.

[0006] Each phase of the transmission line is identified in the following manner. First, for a suspended three-phase transmission line, the transmission line is grounded for each phase and line at one point of the substation or the transmission tower, and the insulation resistance of each phase of the transmission line is measured at the other points. Measure using a megameter. If the insulation resistance of the transmission line at other points is 0Ω, it can be determined that the transmission lines at the two points of the substation and the transmission tower are in phase (ground phase), and this is determined for each phase. By this, each phase can be identified.

[0007]

In the above-mentioned prior art, however, phase detection is performed only from one of the substation and the transmission tower.
m, dozens of kilometers away,
An operator who grounds the transmission line line by line at one point and an operator who performs phase detection at another point by using a mega ring filter and a mega measuring instrument have to confirm the ground phase by using a radio or a telephone, for example. As a result, there is a problem that the operator has a poor feeling of realization and mistakes easily occur.

In addition, for example, in a work for detecting a phase using a mega ring filter in a power transmission tower, it is necessary to replace insulating rods at a high place, and there is a danger of contact with unnecessary high-pressure parts. In addition, there was also a problem that workability was very poor.

In view of the above, the present invention has been proposed in view of the above-mentioned problems, and an object of the present invention is to easily identify each phase of a transmission line even at two points far apart.
It is an object of the present invention to realize quick and reliable phase identification, eliminate the need to use a mega ring filter, and perform a highly safe phase detection operation, thereby reducing labor and time.

[0010]

According to the present invention, there is provided a phase detector for measuring insulation resistance and identifying each phase of a stopped three-phase transmission line or the like. , Are installed at two points separated by a distance and connected by the transmission line, a DC signal from the signal DC power supply is superimposed on each phase of the transmission line to form a transmission signal, and transmission from the one point to another point Transmission of a signal and reception of a transmission signal at another point, transmission of a response signal from another point to one point and reception of a response signal at one point based on the reception of the transmission signal at a predetermined time interval and for each phase The answerback executed in a predetermined order enables each phase of the transmission line to be identified, disconnected, and grounded at each of the two points.

The present invention is also a phase detector for measuring insulation resistance and identifying each phase of a stopped three-phase power transmission line or the like, wherein the induced voltage from another energized power transmission line is converted to a low-impedance resistance. And performing a phase detection operation at a low pressure by grounding with a capacitor.

The measurement of the insulation resistance by an externally attachable mega-measuring device and the phase detection by the measurement of the insulation resistance, and the measurement of the insulation resistance and the automatic phase detection by the answer back can be executed by switching with a switch. .

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a phase detector according to the present invention will be described in detail below.

As shown in FIG. 2, the phase detectors A and B of the present invention include a three-phase transmission line 3 (red-phase, white-phase, and blue-phase transmission lines) that is installed between a substation 1 and a transmission tower 2. 3R, 3W, 3B) for measuring insulation resistance and identifying each phase, and are installed at two points of a substation 1 and a power transmission tower 2, respectively.

The transmission tower 2 in which the phase detector B is installed is separated far from the substation 1 in which the phase detector A is installed, and both points are connected by a transmission line via a number of transmission towers. I have. The phase detection operation by the phase detectors A and B is performed on the three-phase transmission line 3 that is stopped between the substation 1 to be phase-detected and the transmission tower 2 and the stopped three-phase transmission line 3. .

This phase check is performed not only at the above-mentioned two points of the substation and the transmission tower, but also at the two points of the substation and the substation or the transmission tower and the transmission tower. Even at points, other lines other than three-phase transmission lines may be targeted.

Generally, two parallel three-phase transmission lines 3 and 4 are installed between the substation 1 and the transmission tower 2. When the three-phase transmission line 4 of the other line is in a charged state even when the three-phase transmission line 3 of one line is stopped, the induced voltage from the three-phase transmission line 4 of the other line is stopped. Since this occurs in the power transmission line 3, the insulation resistance of the stopped three-phase power transmission line 3 cannot be directly measured by the megameter.

Therefore, the phase detectors A and B of the present invention are constituted by a circuit as shown in FIG. FIG. 2 shows one-phase transmission line 3 of three-phase transmission line 3 (red-phase, white-phase, or blue-phase transmission line 3).
R, 3W, 3B), show phase detectors A and B installed at both substation 1 and transmission tower 2. Based on these,
The principle of phase detection according to the present invention will be described below. The same applies to transmission lines of other phases.

The phase detectors A and B installed at two points, ie, the substation 1 and the transmission tower 2, are stopped by the electromagnetic induction and the electrostatic induction from the three-phase transmission line 4 of the other line that is energized. By grounding the induced voltage generated in the transmission line 3 with a low-impedance resistor 5 (measures against electromagnetic induction) and a capacitor 6 (measures against electrostatic induction), the following phase detection operation is performed at low voltage.

When the hook for connecting the phase detectors A and B is brought into contact with the transmission line 3, a current having a high transient peak value due to the induced voltage flows due to the induced voltage. Thus, the current is suppressed to reduce contact sparks and protect the capacitor 6. Further, in order to reduce the electromagnetic induction current caused by the current flowing through the transmission line 4 of the other line, it is necessary to insert the resistor 5 in series.

As described above, by performing the phase detection operation by setting the induced voltage to a low voltage by grounding with the low impedance resistor 5 and the capacitor 6, the signal processing in the internal circuits of the phase detectors A and B becomes easy. The components constituting the internal circuit can be reduced in size, and the detector body can be reduced in weight and size.

The phase detectors A and B of the present invention comprise two current detectors 8a and 8b (hereinafter referred to as first and second current detectors) which are selectively connected to the transmission line 3 by switching relay contacts 7. ). These first and second current detectors 8
a and 8b are connected to both ends of the capacitor 6 described above. A relay contact 7 that is switched by the operation of the control relay 10 is interposed between one end of the capacitor 6 and the first and second current detectors 8a and 8b. A battery 11, which is a DC power source for signals, is interposed between the first current detector 8a and the first current detector 8a.

A phase detector A is connected to the stopped transmission line 3 in the substation 1 and installed. The phase detection is performed on the stopped transmission line 3 in the transmission tower 2 located far away from the substation 1. The phase detection work is started with the device B connected and installed.

First, the phase detector B is activated, and the phase detector B
The operation of the control relay 10 causes the relay contact 7 to be switched. At this time, even when an induced voltage is generated in the stopped transmission line 3 from another energized transmission line 4, the induced voltage is set to a low voltage by the grounding by the resistor 5 and the capacitor 6, and the low voltage is set. A DC signal of the signal battery 11 is superimposed on each phase of the transmission line 3 having the induced voltage to generate a transmission signal,
The transmission signal is transmitted to the transmission line 3. The transmission signal operates the second current detection circuit 8b of the phase detector A via the transmission line 3 to return to the ground, and at the same time, activates the first current detection circuit 8a of the phase detector B. 7 returns.

In the phase detector A, as described above, the control relay 10 is operated by the operation of the second current detection circuit 8b, and the relay contact 7 is switched by the operation of the control relay 10. Thereby, similarly to the above, the direct current of the signal battery 11 is superimposed on each phase of the transmission line 3 having a low induced voltage due to the grounding of the resistor 5 and the capacitor 6 to form a transmission signal,
The transmission signal is sent to the transmission line 3 as a reply signal. This reply signal operates the second current detection circuit 8b of the phase detector B via the transmission line 3 to return to the ground, and at the same time, activates the first current detection circuit 8a of the phase detector A. 7 returns.

As described above, in each of the phase detectors A and B, the transmission signal from the own side and the reply signal from the other side are confirmed by the respective outputs of the first and second current detection circuits 8a and 8b. Therefore, the transmission lines 3 at the two points of the substation 1 and the transmission tower 2 are determined to be in phase and good in phase.

When the current detectors 8a and 8b do not operate when the phase detector B is activated, the power transmission line 3 at the two points of the substation 1 and the transmission tower 2 is out of phase and the phase detection is defective. Or the transmission line 3 is disconnected.

Further, when the phase detector B is activated, the first current detection circuit 8a operates. However, if there is no response signal due to the transmission signal and the second current detection circuit 8b does not operate, the power transformer is turned off. It can be determined that the transmission line 3 is grounded between the station 1 and the transmission tower 2.

As described above, the first and second current detection circuits 8
According to a and 8b, transmission of a transmission signal from the transmission tower 2 to the substation 1 and reception of the transmission signal at the substation 1, transmission of a reply signal from the substation 1 to the transmission tower 2 based on reception of the transmission signal, and transmission of power The answering signal is received at the tower 2 at a predetermined time interval (described later) and in a predetermined order (described later) for each phase by an answer back, and the transmission line 3 is connected to the substation 1 and the transmission tower 2 at two points. Not only phase identification but also disconnection and grounding can be checked.

As shown in FIG. 4, each phase of the transmission line 3 is connected by an earth hook wire 12 and one of the two phase detectors A and B to which the ground line 13 is connected is connected to one of the phase detectors B. Upon activation, transmission of the transmission signal and reception of the reply signal are executed in a predetermined order (for example, in the order of red, white, and blue),
Further, the other phase detector A receives the start signal of the phase detector B, and receives the transmission signal and transmits the reply signal in a predetermined order (for example, the order of red, white, and blue phases), Further, the transmission and the reception are executed at a fixed time interval (for example, 1.5 seconds). And in both phase detectors A and B,
The phase detection result of each phase of the transmission line 3 is displayed by a lamp, a buzzer, or the like as described later.

Next, specific embodiments of the phase detectors A and B for performing the phase detection work on the three-phase transmission line 3 installed between the substation 1 and the transmission tower 2 will be described in detail below.

FIGS. 5A and 5B show phase detectors A and B of the present invention.
The appearance of is shown. As shown in the figure, the phase detectors A and B have a structure in which a backing belt 15 is attached to a housing 14 in which constituent circuit components to be described later are built-in, so that when a worker climbs the power transmission tower 2, It is easy to equip it. A lid 16 is provided on the front surface of the housing 14.
The front panel 17 with its lid 16 opened is provided with a direct ground switch 18, a function selection switch 19, a mega phase selection switch 20, a mega measurement selection switch 21, and a display lamp as shown in FIG. Group 22 and start button 2
Display unit 25 including 3 and buzzer 24, mega connection terminal 2
6 are provided. Further, a handle 27 is provided on an end face of the housing 14, and red, white, and blue phase terminals 28R, 28W, 28B for connecting the ground hook wire 12 for connection to the three-phase power transmission line 3, and a ground wire. 13 is provided with an E terminal 29.

The components contained in the housing 14 are as shown in FIG. In the figure, of the two phase detectors A and B installed at two points of the substation 1 and the transmission tower 2, only one of the phase detectors B is shown, and the circuit configuration of the other phase detector A is shown. Have the same configuration.

As shown in FIG. 1, the earth switch is directly connected between the red, white and blue phase terminals 28R, 28W, 28B to which the three-phase power transmission line 3 is connected and the E terminal 29 to which the ground line 13 is connected. The 18 contact portions 30 are interposed. This three-phase transmission line 3
Are connected to the red, white, and blue phase terminals 28R, 28W, and 2 respectively.
8B includes a low-impedance resistor 5 (for example, 200
W, 100Ω) and a capacitor 6 (for example, AC600
V, 10 μF) are connected to the ground.

A contact 32 of the function selecting switch 19 is connected to the resistor 5 through a choke coil 31. The mega contact of the contact 32 has a contact 33 of the mega phase selecting switch 20 and a mega measuring selecting switch. 21 contact portions 34 are connected. A mega measurement device 35 can be connected to the contact portion 34 of the mega measurement selection switch 21 via the mega connection terminal 26, and a 2MΩ resistor 36 is connected inside.

The contact part 32 of the function selection switch 19 described above.
The DC voltage detecting circuit 8 (first and second current detecting circuits in FIG. 3) is connected to the And the output of the DC voltage detecting circuit 8 is connected to the control logic circuit 37 described above. The control logic circuit 37 controls lighting of the display lamp group 22 and sounding of the buzzer 24 on the display unit 25 based on an input signal from the start button 23. The DC voltage detection circuit 8 is connected to a battery 11 serving as a signal DC power supply for generating a DC current to be superimposed on the induced voltage reduced by the resistor 5 and the capacitor 6.

The phase detectors A,
The operation procedure and the phase detection operation of B will be described in detail. In the following description, the phase detectors A and B are connected to the three-phase transmission line 3 during suspension, insulation resistance measurement (mega measurement), phase detection by insulation resistance measurement (mega measurement), mega check, answer back Will be described in detail in the order of automatic phase detection.

First, the connection of the phase detectors A and B to the stopped three-phase transmission line 3 is as follows. Substation 1 and transmission tower 2
At two points, the ground wire 13 is connected to the E terminal 29 on the end surface of the housing 14, and the ground hook wire 12 is connected to the red, white, and blue phase terminals 28 R, 28 W, and 28 B. After confirming "ON", the above-mentioned earth hook wire 12 is connected to the stopped three-phase power transmission line 3 in correspondence with each phase. In the following, the phase detector A installed in the substation 1 is defined as the other party, and the phase detector B installed in the power transmission tower 2 is defined as the own side.

First, the mega measurement by the phase detectors A and B is performed as follows after connecting the mega measurement device 35 of 1000 V / 2000 MΩ to the mega connection terminal 26. The direct ground switch 18 is set to "OFF", the function selection switch 19 is set to "mega", and the mega measurement selection switch 21 is set to "measurement between E" or "measurement between lines". At this time, the voltage scale of the megameter 35 indicates the voltage value of the capacitor 6. When the measurement switch of the megameter 35 is pressed in the state as it is, the megameter 35 indicates the insulation resistance value after the time for charging the capacitor 6 described above has elapsed. Here, by switching the mega-phase selection switch 20 to each phase, the insulation resistance between the ground or the line of the three-phase power transmission line 3 is measured, and the mega measurement device 35 displays the insulation resistance value.

The phase detection by mega measurement using the phase detectors A and B is performed in the following manner. First, the phase detector A on the other side
Of the direct ground switch 18 is "OFF", the function selection switch 19 is "Mega", and the mega measurement selection switch 21 is "2MΩ".
Ground ”. By switching the mega-phase selection switch 20 to each phase in the phase detector B on its own side, the transmission line 3
The insulation resistance between the grounds is measured for each phase, and if the phase indicated by 2MΩ by the phase detector B on the own side matches the phase selected by the phase detector A on the other side, the substation 1 and transmission tower 2
It is determined that the transmission line 3 is in phase and good in phase. In addition, 2MΩ is not indicated, and if it is more than 2MΩ, it is determined that the transmission line 3 is broken,
If it is 0 MΩ, it is determined that the transmission line 3 is grounded.

Further, in the mega-check by the phase detectors A and B, when the measurement switch of the mega-meter 35 is pressed after the mega-measurement selection switch 21 is set to "2MΩ inspection", the mega-meter 35 is detected. It is in a state of being connected to the 2MΩ resistor 36 inside the devices A and B, and it is possible to make a megacheck by checking whether or not the megameter 35 measures the 2MΩ resistor 36 and indicates 2MΩ.

Next, automatic phase detection by answer back is
For example, it is performed in the following manner in the order of red phase, white phase, and blue phase. Note that, of the two phase detectors A and B of the other party's side and one's own side, one of the phase detectors which pressed the "start" button 23 first becomes the transmission side, and the other phase detector automatically receives. Side.

First, both the phase detectors A and B on the other side and the own side
Is set to "OFF", and the function selection switch 19 is set to "phase detection". In this state, when the “start” button 23 of the phase detector B on the own side is pressed, the “local” lamp and the “transmit” lamp are lit on the display unit 25, and the control relay 1 is turned on.
0 operates to transmit a transmission signal to the other-side phase detector A via the transmission line 3 through the current limiting resistor 39.

The phase detector B on its own side detects that the DC current for the transmission signal flows by the terminal voltage of the detection resistor 40. If this terminal voltage is not detected, it is determined that the transmission line 3 is disconnected, and the display unit 25 displays “disconnection”.
The lamp and the "bad" lamp light up (see FIG. 7 (a),
In the drawing, ● indicates ON, ○ indicates OFF, and the buzzer 24 sounds (loud). If the "defective" lamp is lit and the buzzer 24 is sounded, the phase detection operation does not proceed. Therefore, by pressing the "start" button 23 again, the "bad" lamp is turned off and the buzzer 24 is silenced. Restart the phase operation.

When the transmission signal transmitted from the phase detector B on the own side is received by the phase detector A on the other side, the control relay 10 of the received phase operates, and a reply signal of the phase is transmitted. Send out to electric wire 3. When the response signal transmitted from the phase detector A on the other side via the transmission line 3 of the phase is received by the phase detector B on the own side, the phase detector B on the own side displays the display unit 2
At 5, the "partner" lamp for that phase is turned on.

At this time, the phase detectors A and B of the other party and
In the display section 25, the "own side" lamp and the "other side"
When the lamp and the lamp have different phases, that is, when the “own side” lamp has a red phase while the “partner” lamp has a white phase (see FIG. 7B), It is determined that the power transmission line 3 is out of phase, and the “defective” lamp is turned on, and the buzzer 24 sounds (loudspeaker).

If there is no response signal from the counterpart phase detector A even after a certain period of time (for example, several seconds) has passed since the transmission of the transmission signal by the phase detector B of the own side, On the display unit 25 of the container B, the “ground” lamp and the “defective” lamp are turned on (see FIG. 7C), and the buzzer 24 sounds (loud).

In the display unit 25 of the phase detector B on the own side,
If the "local" lamp and the "other" lamp are in phase, that is, if both the "local" lamp and the "other" lamp are in red, the next white phase is sent. The same phase detection operation as described above was repeated for the wire, and as a result,
For example, when the “own side” lamp is white, while the “other side” lamp is blue (see FIG. 7D), it is determined that the transmission line 3 is out of phase and “ The "defective" lamp is turned on, and the buzzer 24 sounds (loud). When the white phase matches, the same phase detection operation is further repeated for the next blue phase transmission line, and when the blue phase matches and all three phases match, the three-phase transmission line 3 Are all in phase, and the "good" lamp is turned on (FIG. 7).
(See (e)), the buzzer 24 sounds (sounds down).

As described above, the switching between the mega measurement and the phase detection based on the mega measurement, and the switching between the mega measurement and the automatic phase detection based on the answer back are performed by the “mega”, “phase detection” and the mega measurement selection switches in the function selection switch 19. 21, "Measurement between E" or "Measurement between lines", "2MΩ grounding",
This can be executed by selecting “2MΩ check”.

[0050]

According to the present invention, a DC signal from a signal DC power supply is superimposed on each phase of a transmission line to form a transmission signal, and a transmission signal is transmitted from one point to another point and transmitted at another point. The answerback that transmits a reply signal from another point to one point based on the reception of a transmission signal and receives a reply signal at one point at a predetermined time interval and in a predetermined order for each phase in a remote location. Even at two points separated from each other, it is possible to easily identify each phase of the transmission line, realize quick and reliable identification of each phase, and not only identify each phase of the transmission line, but also disconnection and grounding Judgment is possible and reliability is greatly improved.

In addition, since the phase detection operation is performed at a low voltage by grounding an induced voltage from another energized transmission line with a low-impedance resistor and a capacitor, signal processing in the internal circuit of the phase detector is performed. Therefore, the components constituting the internal circuit can be reduced in size, and a light and compact phase detector can be realized.

Further, the insulation resistance measurement and the phase detection by the insulation resistance measurement, and the insulation resistance measurement and the automatic phase detection by the answer back can be executed by switching with a switch, so that the insulation can be easily performed only by switching the switch. Both the resistance and phase detection operations can be performed, and there is no danger of contacting high-voltage parts such as transmission lines.
Safety can be sufficiently ensured for the worker.
Further, the working time can be shortened, labor can be reduced, and working errors can be reduced, so that the workability can be dramatically improved.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an embodiment of a phase detector according to the present invention.

FIG. 2 is a configuration diagram showing a state where a phase detector is connected to a three-phase transmission line installed between a substation and a transmission tower.

FIG. 3 is a circuit diagram showing a schematic configuration of a phase detector connected to both a substation and a transmission tower with respect to a one-phase transmission line;

FIG. 4 is a configuration diagram showing a state in which a phase detector is connected to both a substation and a transmission tower with respect to a three-phase transmission line.

5A is a side view showing an appearance of a phase detector, and FIG. 5B is a rear view of FIG.

FIG. 6 is a front view showing a front panel of the phase detector;

FIGS. 7A to 7E are front views showing a display unit on a front panel of a phase detector for each phase detection state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substation 2 Transmission tower 3 Three-phase transmission line A, B Phase detector

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[Procedure amendment]

[Submission date] March 23, 1999

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

[0010]

As technical means for achieving the above object, according to an aspect of the present invention performs insulation resistance measurement and phase identification for such a three-phase transmission line stopped, the
Connected by power lines and installed at two locations
Two phase detectors, wherein a DC current from a signal DC power supply is superimposed on each phase of the transmission line to form a transmission signal, and the transmission signal is transmitted from the one point to another point and at another point. Receiving the transmission signal, transmitting the response signal from another point to one point based on the reception of the transmission signal and receiving the response signal at one point at predetermined time intervals and in a predetermined order for each phase , The reception of the transmission signal at the other point
, The response signal of the phase according to the predetermined order is
The answerback to be transmitted enables each phase of the transmission line to be identified, disconnected and grounded at each of the two points.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction contents]

Further, the present invention relates to a method for transmitting power from another power transmission line.
Three-phase transmission line stopped by electromagnetic induction and electrostatic induction
Suppresses transient current flowing due to induced voltage
Ground the stopped three-phase power line with a resistor and a capacitor
It is desirable to adopt a configuration in which:

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0043

[Correction method] Change

[Correction contents]

First, both the phase detectors A and B on the other side and the own side
The direct ground switch 18 is set to “OFF”, and the function selection switch 19 is set to “phase detection” (the contact portion 32 is the relay contact 7
Is switched to the connected contact) . In this state, when the “start” button 23 of the phase detector B on the own side is pressed, the display unit 2
In FIG. 5, the “own side” lamp and the “transmit” lamp are turned on, the control relay 10 is operated, and the relay contact 7 is set in FIG.
Is switched to the contact side indicated by a white circle of
The transmission signal (DC current) is the current limiting resistor 40 and the relay connection
The point 7, the contact 32 of the function selection switch 19, and the resistance 5 are transmitted to the counterpart phase detector A via the transmission line 3.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0044

[Correction method] Change

[Correction contents]

At this time, the phase detector B on its own side is connected to the ground line 1
3 through the relay contact 7 of the control relay 10
The DC voltage detection circuit detects that the DC current
The path 8 detects the terminal voltage of the detection resistor 39 . If this terminal voltage is not detected, it is determined that the transmission line 3 is disconnected, and the "disconnection" lamp and the "defective" lamp are lit on the display unit 25 (see FIG. 7 (a); ● indicates light-on, ○ indicates light-off], and the buzzer 24 sounds (loud). If the "bad" lamp is lit and the buzzer 24 is sounded, the phase detection operation does not proceed.
By pressing again, the "bad" lamp is turned off, the buzzer 24 is silenced, and the phase detection operation is restarted.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0045

[Correction method] Change

[Correction contents]

The transmission signal transmitted from the phase detector B on the own side is received by the phase detector A on the other side . This opponent
In the phase detector A on the side, the relay contact 7 of the control relay 10 is
1 is connected to the contact point indicated by the black circle,
The transmission signal is transmitted to the contact portion 32 (relay) of the function selection switch 19.
-The contact 7 has been switched to the connected contact.)
DC voltage detection circuit through relay contact 7 of control relay 10
8 is detected. In this way, when the signal is received by the phase detector A on the other side, the transmission signal from the phase detector B on the local side is transmitted.
Similarly, the control relay 10 of the received phase operates,
The relay contact 7 is switched to the contact side indicated by a white circle in FIG.
And the response signal (DC current) of that phase by the battery 11
Are the current limiting resistor 40, the aforementioned relay contact 7, and the function selection switch.
The signal is transmitted to the transmission line 3 through the contact portion 32 of the switch 19 and the resistor 5 . When the response signal transmitted from the phase detector A on the other side via the transmission line 3 of the phase is received by the phase detector B on the local side, the phase detector B on the local side displays the phase signal on the display unit 25. Lights up.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0046

[Correction method] Change

[Correction contents]

At this time, the phase detectors A and B of the other party and
In the display section 25, the "own side" lamp and the "other side"
When the phase is different from the lamp, that is, transmission of red phase
For the "Near" lamp that is red phase, for example, the aforementioned transmission signal received at the white phase, the received white phase by No.
"Counterpart" lamp by the operation of the control relay 10 is Ri Do white phase <br/>, in which case [refer to FIG. 7 (b)], it is determined that the power transmission line 3 is heterophase "bad" Lamp The light is turned on and the buzzer 24 sounds (loud).

[Procedure amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0050

[Correction method] Change

[Correction contents]

[0050]

According to the present invention, a DC signal from a signal DC power supply is superimposed on each phase of a transmission line to form a transmission signal, and a transmission signal is transmitted from one point to another point and transmitted at another point. Receiving, transmitting a reply signal from another point to one point based on the reception of the transmission signal and receiving the reply signal at one point at predetermined time intervals and in a predetermined order for each phase ,
The reception of the transmission signal at the other point is in any phase
In addition, the answer back that transmits the reply signal of the phases in the predetermined order allows each phase of the transmission line to be easily identified at both of the two points even at two points that are far apart, and is quick and reliable. In addition, not only each phase of the transmission line can be identified, but also disconnection and grounding can be determined, and the reliability is greatly improved.

[Procedure amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0051

[Correction method] Change

[Correction contents]

In addition, electromagnetic induction from another energized transmission line
Generated in the stopped three-phase transmission line due to electrostatic induction
Resistors and capacitors that suppress the transient current flowing due to the induced voltage
A configuration in which the stopped three-phase transmission line is grounded by a capacitor.
Then , signal processing in the internal circuit of the phase detector becomes easy,
The components constituting the internal circuit can be reduced in size, and a light and compact phase detector can be realized, and its practical value is great. ────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] July 26, 1999

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

[0010]

SUMMARY OF THE INVENTION As a technical means for achieving the above-mentioned object, the present invention provides a method for measuring insulation resistance and identifying each phase of a stopped three-phase transmission line or the like. Two phase detectors respectively installed at two points that are connected and spaced apart from each other, wherein a DC current from a signal DC power supply is superimposed on each phase of the transmission line to form a transmission signal, and the other signal is transmitted from the one point to another phase detector. Transmission of a transmission signal to a point and reception of a transmission signal at another point, transmission of a response signal from another point to one point and reception of a response signal at one point based on the reception of the transmission signal at predetermined time intervals. Run and at one point
Transmission signal to another point and return from one point to one point
The answer signal is transmitted for each phase in a predetermined order, and the phase identification, disconnection, and grounding of the transmission line can be determined at each of the two points.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0029

[Correction method] Change

[Correction contents]

As described above, the first and second current detection circuits 8
According to a and 8b, transmission of a transmission signal from the transmission tower 2 to the substation 1 and reception of the transmission signal at the substation 1, transmission of a reply signal from the substation 1 to the transmission tower 2 based on reception of the transmission signal, and transmission of power The response signal is received at the tower 2 at a predetermined time interval (described later) , and the transmission signal is transmitted from the transmission tower 2 to the substation 1.
Transmission signal transmission and reply signal from substation 1 to transmission tower 2
The transmission of the transmission line 3 is performed in a predetermined order (described later) for each phase, so that not only each phase of the transmission line 3 but also disconnection and grounding can be checked at two points of the substation 1 and the transmission tower 2. it can.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0030

[Correction method] Change

[Correction contents]

As shown in FIG. 4, each phase of the transmission line 3 is connected by an earth hook wire 12 and one of the two phase detectors A and B to which the ground line 13 is connected is connected to one of the phase detectors B. Upon activation, transmission of the transmission signal described above is performed in a predetermined order (for example, in the order of red, white, and blue phases), and the other phase detector A
Upon receiving the start signal of the phase detector B, a predetermined order (for example,
Red, white, the transmission of the reply signal in the order) of the blue phase is performed
Based on the transmission of the transmission signal of one phase detector B,
The transmission signal is received by the phase detector A of the
One of the phase detectors B based on the transmission of the response signal from the detector A
Is received. Further, the transmission and the reception are executed at a fixed time interval (for example, 1.5 seconds). In both the phase detectors A and B, the phase detection results for each phase of the transmission line 3 are displayed by a lamp, a buzzer, or the like, as described later.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0043

[Correction method] Change

[Correction contents]

First, both the phase detectors A and B on the other side and the own side
The direct ground switch 18 is set to “OFF”, and the function selection switch 19 is set to “phase detection” (the contact portion 32 is the relay contact 7
Is switched to the connected contact). In this state, when the “start” button 23 of the phase detector B on the own side is pressed, the display unit 2
At 5, the “transmit” lamp is turned on, the control relay 10 is operated, and the relay contact 7 is switched to the contact side indicated by a white circle in FIG.
Is transmitted to the counterpart phase detector A via the transmission line 3 through the current limiting resistor 40, the above-mentioned relay contact 7, the contact portion 32 of the function selection switch 19, and the resistor 5. This own phase detector
Transmission of the transmission signal from B is performed in a predetermined order for each phase.
(E.g. red, white, blue phase)
In the phase detector B, the transmitted phase of the “own side” lamp is turned on.
You.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0045

[Correction method] Change

[Correction contents]

The transmission signal transmitted from the phase detector B on the own side is received by the phase detector A on the other side. In this counterpart phase detector A, the relay contact 7 of the control relay 10 is connected to the contact side indicated by a black circle in FIG. 7 has been switched to the connected contact), is detected by the DC voltage detection circuit 8 through the relay contact 7 of the control relay 10, and is output by the output of the DC voltage detection circuit 8.
In the display unit 25, the received phase of the "other party" lamp lights up
I do. On the other hand, the phase detector A on the partner side also
As with the transmission of the transmission signal from the control relay 10 is
When activated, the relay contact 7 is switched to the contact side indicated by a white circle in FIG. 1, and the response signal (DC current) of that phase by the battery 11 is transmitted to the current limiting resistor 40, the relay contact 7, and the function selection switch 19. Transmission line 3 through contact portion 32 and resistor 5
Send to Transmission of a reply signal from the other phase detector A
Communication is also performed in a specific order for each phase (eg, red, white, blue
), And the phase detector A on the other side
The transmitted phase of the "side" lamp lights up. When the response signal transmitted from the phase detector A of the other party via the transmission line 3 is received by the phase detector B of the other party , the phase detector B of the other party
As with the phase detector A on the side, the output of the DC voltage detection circuit 8
On the display unit 25, the phase received by the "other party" lamp
Light up.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0050

[Correction method] Change

[Correction contents]

[0050]

According to the present invention, a DC signal from a signal DC power supply is superimposed on each phase of a transmission line to form a transmission signal, and a transmission signal is transmitted from one point to another point and transmitted at another point. , A response signal is transmitted from another point to one point based on the reception of a transmission signal, and a response signal is received at one point at predetermined time intervals , and transmission from one point to another point is performed.
Sending outgoing issues and sending reply signals from other locations to one location
Of each line in a predetermined order, each phase of the transmission line can be easily identified at both points even at two points far apart, and each phase can be identified quickly and reliably. In addition, not only each phase of the transmission line can be identified, but also disconnection and grounding can be determined, and the reliability is greatly improved.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masahiko Morita 4-33 Komachi, Naka-ku, Hiroshima City, Hiroshima Prefecture Inside Chugoku Electric Power Co., Inc. (72) Inventor Sada Fujiwara 3-29-3 Ohamacho, Amagasaki City, Hyogo Prefecture Hase Inside Kawa Electric Industry Co., Ltd. (72) Inventor Tatsuro Fukuhara 3-29-3 Ohamacho, Amagasaki City, Hyogo Prefecture Hasegawa Electric Industry Co., Ltd.

Claims (3)

[Claims] 1. A phase detector for measuring insulation resistance and identifying each phase of a stopped three-phase transmission line or the like, which is installed at two points that are connected to the transmission line and that are far apart from each other.
A DC current from a signal DC power supply is superimposed on each phase of the transmission line to form a transmission signal, and transmission of a transmission signal from one point to another point and reception of a transmission signal at another point, and reception of the transmission signal. Transmission lines are transmitted at each of the two points by an answer back which executes a response signal from another point to one point and a response signal at one point at predetermined time intervals and in a predetermined order for each phase. A phase detector characterized in that each phase identification, disconnection, and grounding can be determined. 2. A phase detector for measuring insulation resistance and identifying each phase of a stopped three-phase transmission line, etc., wherein an induced voltage from another energized transmission line is grounded by a low impedance resistor and capacitor. A phase detector that performs a phase detection operation at a low pressure. 3. The insulation resistance measurement by an externally attachable mega-measuring device and the phase detection by the insulation resistance measurement, and the insulation resistance measurement and the automatic phase detection by the answer back can be executed by switching with a switch. The phase detector according to claim 1 or 2, wherein: