JPS596117Y2 - Electrostatically induced current stabilizer from power lines - Google Patents

Description

[Detailed explanation of the invention] This invention uses electrostatic induction from the power transmission line to stabilize the current flowing to the load when supplying power to the load using electrostatic induction power from the power transmission line. Regarding current stabilizer.

By insulating a certain section of the overhead ground wire of a power transmission line, or installing a conductive line that is separately insulated from the power transmission tower (earth) along the power transmission line, the electrostatic induction power generated between the above-mentioned overhead ground wire or conductive line and the power transmission tower can be reduced. A method has been proposed and implemented that uses the same as a power source.

Conventionally, there was one on each side of the transmission tower (hereinafter simply referred to as the tower).
When a set of three-phase AC voltage is applied and the voltages of the transmission lines on the left and right of the tower are the same voltage or close to it, or when a certain section of the overhead ground wire of the tower is insulated from the tower or the overhead ground wire on the left and right of the tower A method in which a conductive wire separately insulated from the steel tower is installed in the middle position between both overhead ground wires, and a resistor, discharge tube, and wire ring are connected in series between the insulated overhead ground wire or conductive wire and the steel tower. is being implemented.

In this case, the voltage generated between the above-mentioned overhead ground wire or conductive wire and the tower may be charged with both the power transmission lines on the left and right of the tower if the phase arrangement of the power transmission lines on the left and right of the tower is opposite to each other. The voltage is the lowest, and when charging is stopped on either the left or right side of the tower, the voltage increases by more than 60%.

Now, if charging of either power transmission line is stopped, the current will increase more than the voltage increases because discharge tubes have constant voltage characteristics with respect to current, and stopping charging of either power transmission line may cause an accident. If the work lasts for a long time, the discharge tube will generate more heat, which will shorten its life and cause damage such as breakage.

As a countermeasure for these, there is a method of connecting another resistor in series in addition to the series connection of the discharge tube, the resistor, and the wire, and a method of connecting the same resistor as above in series in parallel with the series connected circuit such as the discharge tube and the resistor. Possible methods include installing something between the overhead ground wire or conductive wire and the steel tower to reduce or divert the increased current.

However, in any case, a high voltage of several thousand volts or more or IOKV or more is often applied, which poses problems such as withstand voltage and anti-surge measures, making it difficult to put them into practical use.

This idea was developed in consideration of the above points, and it not only has a simple structure and is inexpensive, but also allows the load to operate stably, as well as prolonging the life of the load. Our objective is to provide a device for stabilizing electrostatically induced current from power transmission lines.

Hereinafter, embodiments of the device for stabilizing electrostatically induced current from a power transmission line of this invention will be described based on the drawings.

FIG. 1 is a circuit diagram showing the structure of one embodiment.

In FIG. 1, the following explanation will be based on the case where a discharge tube of an aircraft obstruction light is used as a load.
Of course, it goes without saying that other loads may be used.

Now, in this FIG. 1, 1 is an overhead ground wire that is insulated for a certain section, and 2 is a steel tower.

Steel tower 2 is grounded to the ground.

A resistor 3, an electrostatic capacitor 4, a wire ring 5, and discharge tubes 6, 7, 8.9 are connected in series between the overhead ground wire 1 and the steel tower 2.

A discharge gap 18 is connected in parallel to the wire ring 5 .

Here, the resistor 3 adjusts the current flowing through the discharge tubes 6 to 9 to a predetermined current.

Next, when charging of either the left or right power transmission line of the steel tower 2 stops, the voltage generated between the insulated overhead ground wire 1 and the steel tower 2 increases by about 60%, so the discharge tubes 6 to 9 The current that flows increases to about 250% when the length of the insulated overhead ground wire 1 is about 1 km, but since the wire ring 5 has a low reactance due to overcurrent, the static electricity connected in series increases. Due to the mutual effect with the capacitor 4, the current increase can be suppressed to about 170%.

Now, to explain this effect in more detail, under normal conditions, that is, when both the left and right power transmission lines are charging, discharge tubes 6 to 9
Since the current flowing through is adjusted to a specified current by the resistor 3, the coil 5 has a specified inductance in a normal state, and the current waveform is also a sine wave or a state close to it.

Next, when either the left or right power transmission line stops charging,
It can be expressed by the equivalent circuit shown in FIG.

In FIG. 2, the same reference numerals as in FIG. 1 represent the same parts as in FIG. 1, and E indicates the voltage generated between the overhead ground wire or conductive wire and the steel tower.

Since the voltage generated between the insulated overhead ground wire 1 and the steel tower 2 rises by more than 60%, the discharge tubes 6 to 9 are
Because of the constant voltage characteristic, the current flowing through the discharge tubes 6 to 9 increases at a rate greater than the voltage increase, reaching about 250% with respect to the increase in the generated voltage.

The wire ring 5 has a low reactance when the current increases above the specified value, and the inductive reactance decreases greatly, so the value of the reactance (1 to ωL) increases as ωLωC decreases, and the insulated Since the discharge tubes 6 to 9 and the electrostatic capacitor 4 are connected in series between the overhead ground wire 1 and the steel tower 2, the voltage required for the discharge tubes 6 to 9 and the resistor 3 and the insulated overhead ground wire 1 and the transmission are The reactance and the discharge tube are calculated based on the power frequency of the series connection of the capacitance C, which is the sum of the mutual capacitance with the electric wire and the ground capacitance of the above-mentioned insulated overhead ground wire 1, and the capacitance of the capacitor 4. The voltage generated by multiplying the voltages of the currents flowing through the wires 6 to 9 at an angle of 90 degrees becomes the voltage generated between the insulated overhead ground wire 1 and the steel tower 2.

Therefore, in response to this voltage rise, the current flowing through the discharge tubes 6 to 9 is reduced by the resistor 3 and the coil 5, which are not connected to the electrostatic capacitor 4.
Compared to a circuit in which the discharge tubes 6 to 9 are connected in series, the increase in current can be significantly suppressed.

It is advantageous that the capacitance of the electrostatic capacitor 4 is small because it can reduce the increase in current with respect to the rising voltage, but its capacity is naturally limited by the value of the current flowing through the discharge tubes 6 to 9 during normal times. It is something that

Now, according to the experimental results, when the phase arrangement is reversed in the transmission lines on the left and right sides of the 275KV tower, the voltage generated between the above-mentioned insulated overhead ground wire 1 and the tower 2 is around 16KV, and the discharge The discharge sustaining voltage of one tube is about 2 KV, and the current needs to be 20 mA or more.

When the insulated overhead ground wire 1 is 1 km long, the total capacitance C of the mutual capacitance with the transmission line and the ground capacitance of the overhead ground wire 1 is 0. 00675μF, the reactance is about 392K47 at 60mm, and if 4 discharge tubes are connected in series, the discharge sustaining voltage needs to be 8KV, and the wire ring 5
If the reactance is 282KΩ for a frequency of 60Hz, the resistance 3 will be 350KJ7, and the current in the coil 5 will be 22KΩ.
．． It becomes 3mA.

Next, when charging of either the left or right power transmission line is stopped, the generated voltage is increased from 16 KV to 29 KV.

Therefore, by calculation similar to above, the current is 58mA
becomes.

It is possible to reduce the increase in current by making the wire ring 5 high reactance, but it is not advisable for economic reasons or other reasons.On the other hand, an insulated overhead ground wire When the electrostatic capacitor 4 is connected in series with the discharge tubes 6 to 9, the resistor 3, and the wire 5 connected in series between the steel tower 1 and the steel tower 2, as shown in the equivalent circuit of Fig. 2, the overhead ground By connecting the capacitor 4, the total capacitance C of the mutual capacitance between the line 1 and the transmission line and the ground capacitance of the overhead ground wire 1 is reduced by half compared to when no capacitor is connected. Due to the combination of the constant voltage characteristics of the discharge tube and the decrease in inductive reactance, when the voltage increases by 29KV,
The increase in current is suppressed to about 34 mA.

FIG. 3 is a graphical comparison of the above-mentioned conditions, with the horizontal axis representing voltage (K■) and the vertical axis representing current (mA).

In FIG. 3, curve A shows the characteristics when the coil 5 and electrostatic capacitor 4 in this invention are connected due to voltage increase.

Further, the curved line shows the characteristics when only the wire ring 5 is connected without using the electrostatic capacitor 4 in this invention due to voltage increase.

As is clear from Fig. 3, it is clearly shown that the current is limited, and the connection of the electrostatic capacitor 4 and the wire 5, which has a low reactance against overcurrent, greatly increases the current. It is clear that it is effective in prevention.

In addition, the coil 5, the electrostatic capacitor 4, the resistor 3, and the discharge tube 6~
9 may be connected at any position as long as they are connected in series.

Although the insulated overhead ground wire has been described in detail above, a conductive wire provided insulated from a power transmission tower also has the same effect and effect as described above.

In addition, we have described in detail the case where the discharge tubes 6 to 9 are installed between the overhead ground wire 1 and the steel tower 2 which are insulated via the resistor 3, but as shown by the dotted line in FIG. Instead, the primary winding 11 of the transformer 10 is connected, the secondary winding 12 is connected to other transformers 13 to 16, and the discharge tubes 6' to 9 are connected via the transformers 13 to 16. ′ may be connected.

Furthermore, although not shown, a discharge tube may be provided in the secondary winding 12 of the transformer 10 as described above.

In addition, due to the above-mentioned precautions such as the wire ring 5 and the electrostatic capacitor 4, and the similar action accompanying them, the overcurrent that occurs when charging of the power transmission line on either the left or right side of the tower is stopped, Suppressing the increase in the flowing current is
Similar to the above, but the primary winding 1 of the transformer 10
If 1 has a characteristic of low impedance against overcurrent, it will be even more effective against overcurrent.

In addition, a load 2 other than the discharge tube is connected to the secondary winding 12 of the transformer 10.
0 also brings about the same effect as a discharge tube, and in this case, L is connected to the secondary winding 12 of the transformer 10.
, a constant voltage element due to C resonance, or these two
If voltage is supplied to the load through a constant voltage transformer to the next winding 12, it can be used as an even more stable power source.

Then, if the capacitance of the electrostatic capacitor 4 is reduced,
The inductance of the wire ring 5 that cancels this increases,
The value by which the impedance decreases with respect to overcurrent also increases, and the increase in current with respect to overvoltage can also be significantly reduced.

Furthermore, although we have described the case of one set of power transmission lines on each side of the tower, in the case of two or more sets of power transmission lines on each side of the tower, it is also possible to use an insulated overhead ground wire or separately insulate it from the tower and install it alongside the transmission line. The above-mentioned voltage for the conductive wires is determined almost entirely by the insulated overhead ground wire or the pair of left and right power transmission lines closest to the conductive wire, and is not significantly related to other power transmission lines. The same is true for one set of power transmission lines on the left and right sides of .

As described above, according to the electrostatically induced current stabilizer from the power transmission line of this invention, between the overhead ground wire 1 installed on the power transmission tower or the conductive wire insulated from the power transmission tower, and the power transmission tower, A load whose power source is electrostatic induction power generated between a line or a conductive line and a power transmission tower is connected in series with a wire ring and an electrostatic capacitor that have low reactance against overcurrent, allowing for a simple structure. Even if the current generated in response to an increase in voltage increases, the load can be operated stably, and damage to the load and reduction in the life of the load can be prevented.

In addition, this invention can solve problems caused by the load not operating, various costs required for load replacement work, and difficult special work due to the load being installed at a high place. The practical effect is extremely large.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing an embodiment of the electrostatically induced current stabilizer from a power transmission line of this invention, Fig. 2 is an equivalent circuit diagram of the same embodiment, and Fig. 3 is the voltage vs. current characteristic of the same embodiment. FIG. 1... Overhead ground wire, 2... Steel tower, 3...
...Resistance, 4...Electrostatic capacitor, 5...
...Wire, 6-9, 6'-9'...Discharge tube, 10.13-16...Transformer, 18...
...Discharge gap, 20...Load.

Claims (1)

[Scope of utility model registration request] A certain section of an overhead ground wire installed on a power transmission tower that is grounded to the earth is insulated from this power transmission tower, or a conductive wire insulated from this power transmission tower is installed along the power transmission line, and the above-mentioned overhead ground wire or conductive wire is installed along the power transmission line. In a device that uses electrostatic induction power generated between the above-mentioned overhead ground wire or conductive line and the power transmission tower as a power source, a load connected between the above-mentioned overhead ground wire or conductive line and the power transmission tower and driven by the above-mentioned electrostatic induction power, and the above-mentioned overhead ground wire or Connected in series with the load between the conductive line and the transmission tower, reducing the total capacitance of the mutual electrostatic capacity of the above-mentioned overhead ground wire or conductive line and the power transmission line and the ground capacitance of the overhead ground wire or conductive line. A power transmission line consisting of a wire ring connected in series with the electrostatic capacitor and load between the above-mentioned overhead ground wire or conductive line and the power transmission tower, and having a low reactance against overcurrent flowing to the above-mentioned load. Electrostatically induced current stabilizer.