JPH0238869A - Phase sequence checker for high voltage distribution line - Google Patents

Abstract

PURPOSE:To achieve a quick checking by arranging a series circuit of two electrodes, a first resistance, a second resistance and a capacitor and a high voltage detector to set values of the first and second resistances at 2/31/2 and 1/31/2 of an impedance of the capacitor. CONSTITUTION:Resistances R1 and R2 and a capacitor C are arranged in series between electrodes 1 and 2 and values thereof are set as follows: R1=2/31/2Xc and R2=1/31/2Xc when an impedance of the capacitor C represented by Xc. A leakage current IRS flows to the series circuit through a cover 80 of a wire and as the phase of the current is set as mentioned above, the current advances by 30 deg. in the potential difference from that VRS of wires 8S and 8R. Hence, the sum of voltage drops gives a vector as illustrated. In other words, this voltage is applied to detector 3 and a neon light emitting section 7 emits light. With the emission of the light emitting section 7, there is a coincidence between the phase sequence of the wires with a direction of the arrow 5 and the wire indicated by the arrow 5 lags by 120 deg. in phase thereby enabling the checking of the phase sequence of a high voltage wire in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a phase sequence checker for checking the phase sequence of a three-phase, three-wire high-voltage distribution line.

B. Summary of the Invention The present invention provides a phase sequence checker for checking the phase sequence of a three-phase, three-wire high-voltage power distribution line, which includes first and second electrodes arranged at a predetermined interval, and a first resistor. , a series circuit of a second resistor and a capacitor, and a high-voltage voltage detector. The '21X pole of is connected to one end of the first resistor, the other end of the first resistor is connected to one end of the series circuit, the other end of the series circuit is connected to the second electrode, The electric appliance is connected to the connection point between the first resistor and the series circuit, the value of the first resistor is 27 (E- times) the impedance of the capacitor, and the value of the second resistor is 175 times the impedance of the capacitor. By making it double, it is possible to check the phase order of a three-phase, three-wire high-voltage distribution line easily and in a short time.

C. Prior Art FIG. 6 shows an example of a three-phase, three-wire high-voltage overhead distribution line whose neutral point is grounded with high resistance on the sending side of a power distribution substation. In the figure, 63 is a power distribution transformer provided in the power distribution substation 61, and 6.1 is a power receiving transformer provided on the power receiving side. and the secondary side of transformer 63 and transformer 64
It is connected to the primary side by a three-phase, three-wire high-voltage overhead distribution line 62. In this example, the neutral point on the sending side of the substation is grounded with high resistance using the so-called GPT method.

In other words, a grounded instrument transformer nG is connected to the secondary side of the transformer 63.
PT is connected and the low pressure side is an oven delta connection.
A limiting resistor CLR is connected to the open circuit portion. With such a high-voltage overhead power distribution vA62, when connecting an uninterruptible layered high-voltage power supply vehicle, bypass cable, high-voltage mobile transformer, etc. to the high-voltage distribution line for example, for distribution system construction, etc., these should be connected in phase order. must be connected according to

D9 Problems to be Solved by the Invention By the way, high-voltage overhead distribution lines are routed from the sending substation and are twisted many times depending on road conditions, branch circuits, and other conditions, so the phase order at various points on the distribution line may be incorrect. It may be unclear.

Therefore, for example, when using an uninterruptible layered high-voltage mobile power supply vehicle, the live connection cable is connected to the high-voltage overhead power distribution line and brought into the power supply vehicle, and the voltage is stepped down by a transformer. The phase relationship with the machine was checked using a phase rotation needle, etc. If this check revealed that the phase order was incorrect, it was necessary to perform further work to change the connection of the live connection cable to the high voltage overhead power generation line. The work to connect or change the connection of live connection cables is usually done at high places using a vehicle for working at heights, so it takes time.
It was also a labor-intensive process.

The purpose of the present invention is to solve such problems and to change the phase order of high voltage distribution lines with extremely simple work and in a short time.
An object of the present invention is to provide a river checker for a high-pressure 7ri line, which enables a high-pressure 7ri line to be inspected.

E1 Means for Solving the Problems In order to achieve the objective of the present invention, a phase sequence checker for checking the phase sequence of a three-phase, three-wire high-voltage distribution line is provided with a phase sequence checker that is arranged at predetermined intervals. A series circuit including first and second electrodes, a first resistor, a second resistor and a capacitor, and a high voltage voltage detector, the first electrode being connected to one end of the first resistor, and the first resistor being connected to one end of the first resistor. The other end of the resistor 1 is connected to one end of the series circuit described above, the other end of the series circuit is connected to the second electrode, and the high voltage voltage detector is connected to the connection point between the first resistor and the series circuit. and the value of the first resistor is 2/E times the impedance of the capacitor, and the value of the second resistor is 1/JE- times the impedance of the capacitor.

F. Select two of the distribution lines constituting the three-phase, three-wire high-voltage distribution line, and bring the first electrode into contact with the first distribution line, and the second electrode with the second distribution line, respectively.

At this time, the phase of the first distribution line is at the level Ft of the second distribution line.
If it is 120 degrees ahead of 1, the connection point between the first resistor and the -11 circuit is the same as the relationship between the resistor's 1' and A high voltage is generated at -t i12 high voltage i
x detects this. In other words, if the high-voltage voltage detector detects voltage when the first and second electrodes are brought into contact with the distribution line, the second electrode If the high voltage detector detects no voltage, the phase of the distribution line that is in contact with the first 711 pole is ahead of that of the second 711 pole.
This means that the phase lags behind the distribution line that is in contact with the electrode.

When using the phase sequence checker of the present invention as shown,
Just by touching the electrode to the distribution line, you can easily check the phase order of the distribution line in a short time.

G. Example Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a circuit diagram showing the electrical configuration of a phase sequence checker for high voltage distribution lines according to the present invention, and FIG. 2 is a front view showing the external appearance of the same checker.

This phase sequence checker for high voltage distribution lines is shown in Figure 1;
As shown in 4~, it consists of electrodes I, 2, resistors R,,R,, capacitor C1, and high voltage voltage detector 3, one part of resistor λ1 is connected to i-pole 1, and a series circuit with resistor R7 and capacitor 〇 is formed. is connected between the other end of the resistor R1 and the electrode 2 and Q). The analyzer 3 connects the resistor and the series circuit of the negative light emitting section 7 and the resistor in parallel. : Connected to form a groove, one end of which is grounded through the resistor R1 and the resistor Iz2 and 1 at the reading point N, and the other end is grounded through the ground capacitance C6 and the ground leakage resistance R8. Here, the values of the resistors R1 and R2 are:
The impedance of capacitor C is Xc (=l/ωCC
Q]) Toshinoko a, n + = 2
/ nx c 1 Ω], R, = I
/, ff1x cΩ].

As shown in FIG. 2, the voltages 1 and 2 are arranged at predetermined intervals so that the two high-voltage arrangements can contact the wires 8, respectively, with the phase sequence being different.

Resistors R3, R7, capacitor C1, and voltage detector 3 are all housed in a T-shaped cedar case 4 made of high-voltage insulators.
It is contained in On the surface of case 4, IIJ'&l
from? An arrow 5 is displayed in the direction of 1di2, and the case 4 is provided with a window 6, at which the neon light emitting part 7 of the voltage detector 3 is arranged.

This phase sequence checker 10 is specifically used as shown in FIG. That is, a worker, for example, gets on the workbench of the aerial work vehicle 51, holds the handle of the phase checker 10, and brings the electrodes 1 and 2 into contact with two of the high-voltage overhead power distribution lines i52, respectively.

In addition, in the figure, 53 is the sending side of the distribution substation shown in an equivalent circuit, and 54 is a pole-mounted switch.

First, the operation when this checker IO is brought into contact with a power distribution line as shown in FIG. 3(a) will be described. That is, the three-phase three-wire distribution line 8R, 8S, 8T consisting of R phase, S phase, and Tl [R phase and S phase distribution line 8R,
Electrode 1 and electrode 2 of the checker-IO are brought into contact with 8S (arrow 5 is directed toward electrode 8S). At this time, as shown in FIG. 3(b), a leakage current IR5 flows in the series circuit consisting of resistors R, Rz and capacitor C through the wire sheath 80. Since the resistors R3 and R7 are set to the above values, the phase of this current is as follows.
It is 30 degrees ahead of the potential difference vR,9 between the electric wires 8S and 8R. Therefore, the sum of the voltage drops due to the resistor R7 and the capacitor C is as shown in the vector diagram of FIG. 3(c). Size IV of 1st place*9
, 1 becomes . In other words, the prosecutor? This voltage is applied to the 1X device 3, and the neon light emitting section 7 emits light.

The operation when the checker 10 is avoided from coming into contact with the power distribution line as shown in FIG. 4 (2L) will now be described. In other words, contact the R river of the distribution lines 8R28S and 8'r and the S phase distribution line 8R58S with the checker 10's 11 ). At this time, as shown in FIG. 11(b), resistance! 1. ．． ．． A leakage current IR5 flows through the series circuit consisting of R, and capacitor C through the wire sheath 80.

Since the resistors R, , R, are set to the above-mentioned values, the phase of this current is the same as in the above case.
1st place difference between R is 301ii from VR9! 'I'm doing it. However, in this case, the sum of the 7r1rf drop due to the resistor R2 and the capacitor C is as shown in the vector diagram in Figure 4 (c), and the N point has the same potential as the ground G. Therefore, this place &
In this case, no voltage is applied to the detector 3, and its neon light emitting section 7 does not emit light.

Since this phase sequence checker operates as described above, when each electrode of the phase sequence checker 10 is brought into contact with two distribution lines, if the neon light emitting section 7 emits light, the phase sequence of the electric wires and the arrow 5
(positive phase), and the wire pointed to by arrow 5 is 1201χ(, γFfJ,!), which is 2 and 1. Also, when neon luminous ink 7 does not emit light, The 111 order of the wires is opposite to the direction of arrow 5 (opposite phase), and arrow 5
As the 0 degree phase progresses, various things occur. .

In this example, a neon light emitting device with 1S was used as a high voltage voltage detector, but this is just an example. Various high voltage voltage detectors can be used.

In addition, if you set the phase sequence using this phase sequence checker and the neon light-emitting part does not emit light when the 3.1 and 1 poles are in contact with the high-voltage distribution line, just in case, turn the checker in direction 3. Conversely, if @9 indicates that the neon light emitting section emits light, the determination result becomes more reliable.

In addition to the method of using the Sojun checker mentioned above, for example, by making the handle of the checker 10 longer,
It becomes possible to check the phase sequence by contacting the distribution line with a phase sequence checker from the ground without using an aerial work vehicle.

1-1 Detailed Description of the Invention As described above, the present invention provides a phase sequence checker for checking the phase sequence of a three-phase three-wire high-voltage distribution T and wires. a direct voltage detector including first and second electron microscopes, a first resistor, a second resistor and a capacitor, and a high-voltage voltage detector, the first electrode being connected to one end of the first resistor; The other end of the first resistor is connected to one end of the series circuit, the curved end of the series circuit is connected to a second electrode, and the high voltage voltage detector is connected to the connection point between the first resistor and the series circuit. However, the value of the first resistor is 2ir"r times the impedance of the capacitor, and the value of the second resistor is +76 times the impedance of the capacitor.

According to the present invention, it is possible to realize a phase sequence checker for high-voltage distribution lines, which allows checking the phase sequence of high-voltage distribution lines with extremely simple work and in a short time.

By using this phase sequence checker, there is no need to carry out the troublesome work of installing a transformer to step down the voltage and then checking the phase sequence using a phase rotation meter or the like. In addition, after connecting a live connection cable to the distribution Ti line and drawing power to a mobile power supply vehicle, etc., check the phase sequence using a phase rotation meter, etc.
This eliminates the time-consuming and labor-intensive task of changing the hot connection cable connection if it is incorrect.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an actual example of a phase sequence checker for high voltage distribution lines according to the present invention, and FIG. 2 is a top view showing the same embodiment.
FIG. 3(2L) is an explanatory diagram showing the usage state of the same embodiment, FIG. 3(b) is a circuit diagram showing the voltage and current of each part of the same embodiment in the usage state of FIG. 3(a), Figure (c) is a vector diagram showing the voltage and current of each part of the same embodiment in the usage state of Figure 3 (a), Figure 4 (a) is an explanatory diagram showing another usage state of the same example, Figure (b) is Figure 4 (a)
FIG. 4(c) is a circuit diagram showing the voltage and current of each part of the same embodiment in the usage state of FIG. 4(a), and FIG. 6 is an explanatory diagram showing how to use the same embodiment, and FIG. 6 is a circuit diagram showing high voltage overhead distribution line equipment.

Claims (1)

[Claims] (1) In a phase sequence checker for checking the phase sequence of a three-phase three-wire high-voltage distribution line, first and second electrodes arranged at a predetermined interval, a first resistor, a second It includes a series circuit of a resistor and a capacitor, and a high voltage voltage detector, the first electrode is connected to one end of the first resistor, the other end of the first resistor is connected to one end of the series circuit, and the series circuit is connected to the series circuit. the other end of the circuit is connected to a second electrode;
The high voltage voltage detector is connected to the connection point between the first resistor and the series circuit, the value of the first resistor is 2/√3 times the impedance of the capacitor, and the value of the second resistor is the impedance of the capacitor. A phase sequence checker for high voltage distribution lines, which is 1/√3 times as large as 1/√3.