JPH06153423A - Transmission line monitoring sensor - Google Patents

Abstract

PURPOSE:To provide a transmission line monitoring sensor which simplifies the constitution by dispensing with an addition means for operation parameters and materializes cost down by suppressing the influence by a shunt in the case where it is applied to a plural-conductor cable. CONSTITUTION:DC voltage is acquired, based on each current transformer, being equipped with a monitor sensor unit 2A, which includes a transformer 6a for detection detecting the operation parameter of a bus 1A and a transformer 4a for power source operating as a power source, being coupled with the bus 1A, and a second monitor unit 2B, which includes a transformer 6b for detection detecting the operation parameter of a bus 1B, a transformer 4b for power source working as the power source, being coupled with the bus 1B and connected in series with the transformer 4a for power source, and a processor 7B processing the operation parameter of each bus as general data and transmitting it to a ground station.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission line monitoring sensor provided in a high-voltage transmission line for the purpose of, for example, locating a faulty section in a substation, and particularly improving reliability and
The present invention relates to a transmission line monitoring sensor that has been downsized and reduced in cost.

[0002]

2. Description of the Related Art Generally, in a power transmission system or a distribution system of a substation, a transmission line monitoring sensor for detecting a circuit state is provided on each bus of a high-voltage transmission line, and operating parameters such as current and temperature of each bus are provided. To the ground station. In this type of power transmission line monitoring sensor, a CPU serving as an arithmetic processing unit having a data processing function and a transmission function, an operation parameter detecting unit including a transformer such as a solenoid coil, and a power supply unit including a current transformer are provided. It is built in.

FIG. 5 is a sectional view showing a conventional transmission line monitoring sensor disclosed in Japanese Patent Laid-Open No. 63-198879 together with the transmission line. Here, only a single line segment of a plurality of transmission lines is shown. Show. In the figure, 1 is a current I when a high voltage is applied.
A bus 2 of a transmission line through which a current is flowing is a monitoring sensor unit provided on the bus 1 for detecting an operating parameter such as a current I. The monitoring sensor unit 2 is composed of the following elements 3 to 7.

An electric field shield 3 covers the entire surveillance sensor unit 2. Reference numeral 4 denotes a power source transformer, that is, a current transformer, which takes out electric power by using the bus bar 1 as a primary coil.
An iron core 41 electromagnetically coupled to the coil and a coil wound around the iron core 41
It consists of 42. Reference numeral 5 denotes a power supply processing unit that converts an alternating current obtained from the current transformer 3 into a direct current voltage, and constitutes a power supply device together with the current transformer 3.

Reference numeral 6 denotes a detection transformer or solenoid coil for electromagnetically coupling with the bus bar 1 to measure a current I flowing through the bus bar 1, which is generally called a Rogowski coil. Reference numeral 7 denotes an arithmetic processing unit, that is, a CPU that takes in the current I measured through the solenoid coil 6, and has a data processing function of processing the current I as data and the data processed current I to a ground station (not shown). It includes a transmitting function for transmitting and a receiving function for receiving a command from the ground station.

The monitoring sensor unit 2 is divided into two parts before assembly, and is attached to the bus bar 1 and then integrated as shown in the figure. The monitoring sensor unit similar to that in FIG. 5 is provided for each bus bar, and is configured, for example, for three phases corresponding to each phase.

Next, the operation of the conventional transmission line monitoring sensor shown in FIG. 5 will be described. When the current I flows through the bus bar 1, the current I is measured as the voltage V via the solenoid coil 6 in the monitoring sensor unit 2. The voltage V corresponding to the current I is sent to the CPU 7 for data processing,
It is transmitted to the ground station via the antenna (not shown in FIG. 5).

At this time, the output voltage V of the solenoid coil 6 is expressed as follows, where m is the number of turns of the solenoid coil and K is a proportional coefficient.

V = K · m (dI / dt) (1)

From the equation (1), the voltage V is proportional to the differentiation of the current I, so that the current I can be obtained by integrating the voltage V.

Therefore, the CPU 7 controls the solenoid coil 6
The voltage V obtained by is integrated into a signal representing the current I, amplified, AD-converted, coded, and then transmitted from the antenna to the ground station. At this time, in order to prevent interference with a detected value of an electric quantity other than the current I, FM modulation or the like is performed at a frequency assigned in advance.

The ground station receives the transmission signal from each monitoring sensor unit 2, decodes it, and then performs various digital arithmetic processes necessary for determining the presence or absence of an accident and comprehensive determination. In this way, the amount of electricity detected by the monitoring sensor unit 2 is always multiplexed and transmitted to the ground station as data that changes from moment to moment, regardless of whether it is steady or when an accident occurs.

On the other hand, in each monitoring sensor unit 2, an AC current is taken out by the current transformer 4 and converted into a DC voltage by the power supply processing unit 5 to be used as a power supply. However, for example, for a high-voltage power transmission line in which two conductors are electrically connected in parallel for one phase, it is necessary to install the monitoring sensor unit 2 on each conductor or bus bar. Also, to measure the current I for one phase,
It is necessary to add a pair of bus bar data.

Therefore, the CPU on the side of the ground station is provided with an adding means, and the current values measured by the respective monitoring sensor units 2 are added to obtain the final bus data, that is, the current I. Further, since the currents flowing through the pair of bus lines are shunted, they are likely to become unbalanced, and the current transformer 4 installed on the bus line on the side where the shunt current is small is enlarged to generate a required voltage as a power source. It will be.

[0015]

As described above, since the conventional transmission line monitoring sensor uses the monitoring sensor unit 2 having the same structure, when it is applied to a multi-conductor transmission line, it is detected in each bus bar. There is a problem in that it is necessary to provide a means for adding operating parameters in the ground station, and the current transformer 4 becomes large in size, so that cost reduction cannot be realized.

The present invention has been made to solve the above problems, and when applied to a multi-conductor power transmission line, it simplifies the construction by eliminating the addition means of operating parameters, and also uses shunting. It is an object of the present invention to obtain a transmission line monitoring sensor that suppresses the influence and realizes cost reduction.

[0017]

According to a first aspect of the present invention, there is provided a power transmission line monitoring sensor, which includes a first detecting transformer for electromagnetically coupling with a first bus bar to detect a first operating parameter.
And a first monitoring sensor unit including a first power source transformer that electromagnetically couples with the first bus bar and acts as a power source; and a second operating parameter that is electromagnetically coupled with the second bus bar. A second detection transformer, a second power transformer which is electromagnetically coupled to the second busbar to act as a power source and which is connected in series with the first power transformer, and 1
And a second monitoring sensor unit including an arithmetic processing unit for processing the second operation parameter as comprehensive data and transmitting it to the ground station.

Further, a transmission line monitoring sensor according to a second aspect of the present invention includes a first detecting transformer for electromagnetically coupling with a first bus bar to detect a first operating parameter, and a first detecting transformer. First monitoring sensor unit including a power source transformer that electromagnetically couples with the busbar of FIG. 6 and acts as a power source, and second detection that electromagnetically couples with the second busbar to detect the second operating parameter. And a second monitoring sensor unit including an arithmetic processing unit that processes the first and second operation parameters as comprehensive data and transmits the integrated data to the ground station.

According to a third aspect of the present invention, in addition to the structure of the second aspect, the power transmission line monitoring sensor has a core member made of a highly magnetically permeable magnetic material, which is wound around a part of the second busbar. Two
The magnetic resistance value of the busbar is set to be larger than the magnetic resistance value of the first busbar.

[0020]

According to the first aspect of the present invention, the current transformers in the monitoring sensor units installed for each bus bar are connected in series to obtain a DC voltage, and the operating parameter obtained from each monitoring sensor unit is The processing unit in the monitoring sensor unit of FIG. 1 comprehensively processes the data and transmits it to the ground station.

In the second aspect of the present invention, the power source is secured by the current transformer in the monitoring sensor unit installed on one bus bar, and the operating parameters obtained from each monitoring sensor unit are applied to the other bus bar. The arithmetic processing unit in the installed monitoring sensor unit comprehensively processes and transmits to the ground station.

In the third aspect of the present invention, the magnetic resistance of the second bus bar where the current transformer is not installed is increased to secure the current of the first bus bar where the current transformer is installed. To do.

[0023]

【Example】

Example 1. Hereinafter, Example 1 of the present invention (corresponding to claim 1)
Will be described with reference to FIG. FIG. 1 is a cross-sectional view showing a first embodiment of the present invention together with a two-conductor power transmission line. 1A and 1B correspond to a bus bar 1, 2A and 2B correspond to a monitoring sensor unit 2, and 3a and 3b are electric field shields. 3, 4a and 4b correspond to the current transformer 4, 5A corresponds to the power supply processing unit 5, 6a and 6b correspond to the solenoid coil 6, and 7B corresponds to the CPU 7.

1A and 1B are two conductors, that is, first and second busbars
(Hereinafter, simply referred to as busbars), 2A and 2B are busbars 1A
1st and 2nd monitoring sensor units installed individually in 1B and 1B (hereinafter, simply referred to as monitoring sensor units, respectively)
Is.

The monitoring sensor unit 2A on the busbar 1A side is a busbar
A first detection transformer or solenoid coil 6a for detecting a current Ia of 1A, a first power transformer or current transformer 4a electromagnetically coupled to the bus bar 1A, a current transformer 4a and a second current. It includes a power transformer 5A cooperating with a transformer (described later).

The monitoring sensor unit 2B on the bus 1B side is a bus
A second detection transformer or solenoid coil 6b for detecting the current Ib of 1B, a second power transformer or current transformer 4b electromagnetically coupled to the bus 1B, and first and second operating parameters, namely It includes a CPU 7B for processing the currents Ia and Ib as comprehensive data and transmitting it to the ground station. Second
The current transformer 4b is connected in series with the first current transformer 4a and introduced into the power supply processing unit 5A.

Reference numeral 10 is a lead wire for connecting the circuit elements in the monitoring sensor units 2A and 2B to each other. By connecting the solenoid coils 6a and 6b in series, the detected currents Ia and Ib are added. By introducing the current transformers 4a and 4b in series with the introduction into the CPU 7a,
The alternating current obtained from each current transformer 4a and 4b is introduced into the power supply processing unit 5A.

FIG. 2 is a current transformer according to the line AA in FIG.
FIG. 4B is a cross-sectional view showing the periphery of 4b. The electric field shield 3b and the current transformer 4b in the monitoring sensor unit 2B are concentrically arranged around the bus bar 1B, and have a structure in which the electric field shield 3b and the current transformer 4b are divided into two parts so as to be easily attached to the bus bar 1B. .
A packing (not shown) is provided on the electric field shield 3b to provide a waterproof structure. The structure of Fig. 2 has a bus bar 1A.
The same applies to the monitoring sensor unit 1A on the side.

Next, the operation of the first embodiment of the present invention shown in FIGS. 1 and 2 will be described. The currents Ia and Ib flowing through the buses 1A and 1B are detected via the solenoid coils 6a and 6b. The detected currents Ia and Ib are introduced into the CPU 7B from the solenoid coils 6a and 6b connected in series via the lead wire 10 and transmitted to the ground station as comprehensive data. Therefore, it is not necessary to add the received data on the ground station side, and it is possible to realize downsizing and cost reduction.

Further, the current transformers 4a and 4b are connected in series via the lead wire 10, and the alternating currents obtained from the respective current transformers 4a and 4b are totally introduced into the power supply processing unit 5A. Converted to DC voltage. DC voltage E generated at this time
o is expressed as follows.

Eo = N · ω · μo · S · (Ia + Ib) / (2 · Lg) (2)

However, in the equation (2), N is the current transformer 4a.
And 4b, the number of turns of the coils 42a and 42b, ω is the frequency of each alternating current, μo is the magnetic permeability of the vacuum, S is the cross-sectional area of the iron cores 41a and 41b, and Lg is the air gap distance between the divided portions of the iron cores 41a and 41b. .

By calculating the DC voltage Eo based on the sum of the currents Ia and Ib as shown in the equation (2), even if the shunting ratio of the currents Ia and Ib flowing through the two buses 1A and 1B changes. The DC voltage Eo does not change, and a required voltage can be secured. Further, since the required DC voltage Eo can be obtained from the current transformers 4a and 4b in series, the current transformers 4a and 4b can be downsized.

By providing the power supply processing unit 5A on one busbar 1A side and the CPU 7B on the other busbar 1B side, the electric field shields 3a and 3b can be miniaturized while maintaining the same shape, further reducing the cost. Can be realized.

Example 2. In the first embodiment, each bus bar
Although the current transformers 4a and 4b are provided in 1A and 1B, the current transformers may be provided only in the busbar (for example, 1A) if the current of one busbar can be secured. FIG. 3 shows a second embodiment of the present invention.
It is sectional drawing which shows (corresponding to claim 2), and 1A and 1B, 3a and 3b, 6a and 6b, 7B and 10 are the same as the above.

2A 'and 2B' are monitoring sensor units 2A and
It corresponds to 2B, 4A corresponds to the current transformer 4a, and 5B corresponds to the power processing unit 5A. In this case, the current transformer 4A is provided only in the one monitoring sensor unit 2A ', and the power processing unit 5B
Is provided only on the other monitoring sensor unit 2B '. Therefore, by simplifying the current transformer, further downsizing and cost reduction are realized.

Example 3. Next, with reference to FIG. 3, a third embodiment (corresponding to claim 3) of the present invention which realizes further downsizing and cost reduction than the second embodiment will be described. In FIG. 3, 8 is a waterproof tape wound around the busbar 1B not provided with the current transformer 4A, and 9 is a core member wound around a part of the busbar 1B via the waterproof tape 8.

The core member 9 has a high magnetic permeability such as permalloy.
It is made of a magnetic material of (low magnetic resistance), formed into a tape shape, and wound around the bus bar 1B. In this case, since no void is formed in the core member 9, the magnetic resistance value of the core member 9 is extremely low. As a result, the magnetic resistance value of bus 1B is
Is set to be larger than the magnetic resistance value of, and most of the transmission line current is shunted to the busbar 1A side where the current transformer 4A is installed.

Therefore, the required DC voltage Eo 'is secured based on the AC current from the current transformer 4A only, and the DC voltage Eo' generated at this time is expressed as follows.

Eo ′ = N ′ · ω · μo · Sa · Ia ′ / (2 · Lg) (3)

However, in the equation (3), N'is a current transformer.
The number of turns of the coil 42A of 4A, Sa is the cross-sectional area of the iron core 41A, I
a'is the current of bus 1A.

The DC voltage Eo 'obtained by the current transformer 4A as shown in the equation (3) is converted into the current transformer as shown in the equation (2) (Embodiment 1).
In order to make it equal to the DC voltage Eo obtained at 4a and 4b, if the currents Ia 'and Ib' of each bus bar are the same, the iron core 41A
The cross-sectional area Sa of 2 may be set to the cross-sectional area (2S) of two iron cores of the first embodiment.

Generally, an iron core divided as in Example 1
Since 41a and 41b have high magnetic resistance, the required DC voltage Eo
In order to generate the noise, the weight of the iron cores 41a and 41b becomes large, and a strong strength of the transmission line supporting portion such as insulator is required, and the size becomes large as a whole. In particular, assuming that the currents Ia and Ib of each bus bar are reduced due to fluctuations in the transmission line current, it is necessary to further enlarge the iron cores 41a and 41b in order to secure the required DC voltage Eo.

However, as shown in FIG. 3, the shunt ratio of the transmission line current is made unbalanced, and the current Ia 'flowing in the bus 1A is changed to the bus 1B.
When the current Ib 'on the side is increased, the cross-sectional area Sa of the iron core 41A can be made smaller than the cross-sectional area (2S) of two iron cores 41A. Further, even if the current of the entire transmission line is small, the required DC voltage Eo ′ can be obtained by the unbalanced shunt.

At this time, since the core member 9 provided on the busbar 1B side has a high magnetic permeability and no voids, the magnetic resistance of the busbar 1B can be increased with a small weight and the overall weight is increased. There is no such thing. Further, even if the currents Ia 'and Ib' of each busbar are small, the required DC voltage Eo 'can be obtained by using the current transformer 4A of the iron core 41A, which is not so large, due to the unbalanced shunt, so that the size and cost can be further reduced. Down can be realized.

[0046]

As described above, according to claim 1 of the present invention, the first detecting transformer for electromagnetically coupling with the first bus bar to detect the first operating parameter, and the first detecting transformer. A first monitoring sensor unit including a first power supply transformer that electromagnetically couples to the busbar and acts as a power source; and a second monitoring sensor unit that electromagnetically couples to the second busbar to detect a second operating parameter. 2, a detection transformer, a second power transformer that is electromagnetically coupled to the second busbar to act as a power source, and is connected in series with the first power transformer, and the first and second transformers. And a second monitoring sensor unit including an arithmetic processing unit that processes the operating parameters of the above as total data and transmits to the ground station, and connects the current transformers in the monitoring sensor units installed for each bus bar in series. Obtain the DC voltage and obtain it from each monitoring sensor unit. The operation processing unit in one of the monitoring sensor units comprehensively processes the data of the operating parameters and sends it to the ground station, so when applying to a multi-conductor transmission line, the operating parameter adding means is not required. As a result, there is an effect that a power transmission line monitoring sensor that simplifies the configuration and suppresses the influence of the shunt to realize cost reduction is obtained.

According to the second aspect of the present invention, the first detecting transformer for electromagnetically coupling with the first bus bar to detect the first operating parameter, and the first bus bar and the electromagnetic wave. A first monitoring sensor unit including a power source transformer unit that is electrically coupled to act as a power source, and a second detection transformer unit that is electromagnetically coupled to the second busbar to detect a second operation parameter, And a second processing unit that processes the first and second operation parameters as comprehensive data and transmits the integrated data to the ground station.
The monitoring sensor unit installed in one of the bus bars is used to secure the power supply by the current transformer in the monitoring sensor unit installed in one of the bus bars, and the operating parameters obtained from each monitoring sensor unit are installed in the other bus bar. Since it is processed comprehensively by the internal arithmetic processing unit and transmitted to the ground station, when applied to a multi-conductor transmission line, the operation parameter adding means is unnecessary and the configuration is simplified and further miniaturized. Also, there is an effect that a transmission line monitoring sensor that realizes cost reduction can be obtained.

According to claim 3 of the present invention, in addition to the structure of claim 2, a core member made of a magnetic material having a high magnetic permeability is wound around a part of the second bus bar, so that the second bus bar is provided. Is set to be larger than the magnetic resistance value of the first busbar to secure the current of the first busbar in which the current transformer is installed. There is an effect that a transmission line monitoring sensor that simplifies the configuration by eliminating the addition means of the operating parameters and further realizes downsizing and cost reduction can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a sectional view showing Embodiments 2 and 3 of the present invention.

4 is a sectional view taken along line BB in FIG.

FIG. 5 is a cross-sectional view showing a conventional monitoring sensor together with a power transmission line.

[Explanation of symbols]

 1A, 1B Bus bar 2A, 2B, 2A ', 2B' Monitoring sensor unit 4a, 4b, 4A Current transformer (transformer for power supply) 6a, 6b Solenoid (transformer for detection) 7B CPU (arithmetic processing unit) 9 Core member

Claims (3)

[Claims] 1. A monitoring sensor provided on each bus of a power transmission line to be monitored for detecting an operating parameter of the power transmission line, the first sensor being electromagnetically coupled to the first bus. A first monitoring sensor unit including a first detection transformer for detecting a parameter, and a first power transformer for electromagnetically coupling with the first busbar to act as a power source; A second detection transformer for electromagnetically coupling to the busbar to detect a second operating parameter; a second transformer for electromagnetically coupling with the second busbar to act as a power source and the first power transformer. A second power supply transformer connected in series, and
A second processing unit for processing the first and second operation parameters as comprehensive data and transmitting the data to the ground station;
And a monitoring sensor unit for the transmission line. 2. A monitoring sensor provided on each bus of a power transmission line to be monitored for detecting an operating parameter of the power transmission line, the first sensor being electromagnetically coupled to the first bus. A first monitoring sensor unit including a first detection transformer for detecting a parameter, and a power transformer for electromagnetically coupling with the first busbar to act as a power source; Second transformation unit for detecting a second operation parameter by being combined with each other, and the first and second
And a second monitoring sensor unit that includes an arithmetic processing unit that processes the operating parameters of the above as integrated data and transmits the integrated data to the ground station. 3. A core member made of a highly magnetically permeable magnetic material is wound around a part of the second bus bar, and the magnetic resistance value of the second bus bar is made larger than the magnetic resistance value of the first bus bar. The transmission line monitoring sensor according to claim 2, wherein the transmission line monitoring sensor is set.