KR101325997B1 - Insulated housing with voltage detection and power switching apparatus using that - Google Patents

Abstract

The present invention relates to an insulated housing of a processing switch or a circuit breaker with a voltage sensor. The insulated housing in which a lead-in wire at a load side and a lead-in wire at a high voltage are led, and a switching means switching the connection between the load side and the high voltage side is embedded comprises a housing formed into an insulator; a switching rod installed to move back and forth on one side of the housing and switching the connection between the load side and the high voltage side by driving the switching means; a current transformer installed inside the housing; and a voltage sensor installed along a ground line of the current transformer and sensing a voltage applied to the load side or the high voltage side. The present invention, when an eco-friendly processing switch with a voltage sensor is composed, suppresses errors of a sensed voltage by separating a next phase switch and the voltage sensor and preventing the voltage from being induced from a next phase, and makes the insulated housing small by increasing space utilization inside the housing.

Description

INSULATION HOUSING WITH VOLTAGE SENSING FUNCTION AND POWER SWITCHING APPARATUS USING THE SAME

The present invention relates to an insulating housing in which a voltage sensing sensor is built in a housing such as a switch or a circuit breaker, and a power switching device using the same, and more particularly, has a voltage sensing function for minimizing a detection error caused by an induced voltage of another adjacent phase. An insulating housing and a power switch using the same.

In general, when supplying power to the load side, a breaker or switchgear is installed in the substation or water substation facility to cut off the connection between the high voltage side and the load side in case of an emergency such as abnormal voltage generation. Prevent and protect installations. The switch or breaker typically introduces the high voltage side line and the load side line into the high pressure side bushing and the load side bushing, and opens and closes the high pressure side connection terminal and the load side connection terminal in conjunction with the opening / closing rod inside the insulating housing.

On the other hand, it is necessary to detect the high voltage side and the load side voltage in order to determine the cause of the failure, such as when the breaker or the switchgear performs the opening and closing switching operation. Conventionally, a sensor is installed by disassembling an existing insulating housing. However, the recent eco-friendly (ECO) insulating housing has a built-in voltage sensing sensor for the purpose of preventing leakage of the internal insulation by the installation of a sensing sensor, and further includes a current transformer (Current Transformer).

1 is a front view illustrating a conventional processing switch insulation housing. Referring to FIG. 1, a first terminal 12 is installed in front of the housing 10, and a second terminal 14 is installed at an upper end thereof. A load side lead wire and a high pressure side lead wire are connected to the first terminal 12 and the second terminal 14, respectively. In some cases, a high pressure side lead wire is connected to the first terminal 12 and a load side is connected to the second terminal 14. A lead wire may be connected.

The first terminal 12 and the second terminal 14 are insulated by the bushings 11 and 16, respectively, and the bushing 22 for insulation is also installed at the lower end of the housing 10. These bushings 11, 16, 22 are integrally formed in the housing 10. In Figure 1, the left and right sides of the housing 10, the installation pipes 22, 24 in which the voltage sensor is built is formed.

FIG. 2 is a front sectional view of the insulating housing illustrated in FIG. 1. Referring to FIG. 2, the first connection terminal 13 is connected to the first terminal 12 inside the housing 10, and the second connection terminal 15 is connected to the second terminal 14. The first connection terminal 13 is lifted by the opening and closing rod 18 to be in contact with or separated from the second connection terminal 15, thereby opening and closing the switch.

At this time, each of the first terminal 12 and the second terminal 14 is connected to the first voltage sensor 32 and the second voltage sensor 34, the voltage sensor is shown in the housing 10 ) It is embedded in the space on both sides from the inside. This is to maximize the separation of the two voltage sensing sensors. Reference numerals 33 and 35 are sensing lines 33 and 35 drawn out from each voltage sensing sensor.

By the way, as shown by the dotted line in Fig. 2 due to spatial constraints in the air, the three phase switch is normally arranged adjacent to each other. In such an arrangement, there is a problem in that the voltage of the side phase switch is induced in the voltage sensing sensor so that the phase is changed or an error of the sensing voltage is generated.

Conventionally, the high voltage side and the load side voltage are sensed by correcting such a phase change and a sense voltage error by a circuit or a program. However, it is difficult to completely correct the error of the sense voltage, there is still a problem that the diagnosis is not accurate, there is a problem that the increase in the manufacturing cost and maintenance costs due to the additional configuration, such as switchgear or breaker voltage detection circuit.

The present invention in the construction of an insulating housing such as an eco-friendly processing switchgear with a built-in voltage sensor, by suppressing the problem of the voltage of the phase adjacent to the voltage sensor as possible, to prevent and detect the phase change or error of the detected voltage It is an object of the present invention to provide an insulating housing having a new structure of voltage sensing function capable of simply configuring a circuit, and a power switching device using the same.

Insulation housing having a voltage sensing function according to an embodiment of the present invention, the insulated housing in which the load-side lead wire and the high-voltage side lead wire is respectively introduced and the opening and closing means for opening and closing the connection of the load side and the high voltage side is built in the insulator A housing formed of; An opening / closing rod which is inserted into the housing so as to be moved forward and backward and opens and closes the connection between the load side and the high pressure side by operating the opening and closing means; An instrument current transformer installed inside the housing; And a voltage sensing sensor installed along a ground line of the current transformer for the instrument and sensing a voltage applied to the load side or the high voltage side.

In the insulating housing having a voltage sensing function according to another embodiment of the present invention, the voltage sensing sensor is a high pressure sensing sensor connected to the high voltage side lead wire to sense the high voltage side voltage.

In the insulating housing having a voltage sensing function according to another embodiment of the present invention, the high pressure sensing sensor is installed along the front or rear of the inside of the housing.

In the insulating housing having a voltage sensing function according to another embodiment of the present invention, a first terminal into which a load side lead-in is drawn in front of the housing is installed, and a second terminal into which the high-voltage side lead-in is drawn into an upper end of the housing. It is installed, and is connected to the load side lead-in rear or front of the inside of the housing is further installed a low pressure sensor for sensing the load side voltage.

In the insulating housing having a voltage sensing function according to another embodiment of the present invention, the high pressure sensor and the low pressure sensor are resistive voltage detectors (RVD).

Power switching device according to an embodiment of the present invention, any one of the insulating housing with the above-described voltage sensing function.

According to the insulating housing having a voltage sensing function of the present invention and a power switching device using the same, the voltage sensing sensor is installed along the ground line of the instrument current transformer and disposed at the front or the rear of the housing, thereby increasing the space utilization inside the housing. It is possible to reduce the phase change of the detected voltage or the occurrence of error by suppressing the induced voltage of the upper phase to the voltage sensing sensor as much as possible, and it is possible to accurately perform switchgear monitoring and fault diagnosis by the voltage sensing.

In addition, according to the present invention, by installing a low pressure sensor on the rear of the housing, there is an effect that can safely protect both the high voltage side and the low voltage side voltage sensor sensor from the induced voltage on the side.

1 is a front view illustrating a conventional processing switch insulation housing,
Figure 2 is a front sectional view showing an example of installation of the conventional processing switch insulation housing,
3 is a side view illustrating an insulated housing according to the present invention;
4 is a side cross-sectional view illustrating an internal configuration of an insulating housing according to the present invention, and
5 is a front sectional view showing an installation example of the insulating housing according to the present invention.

Hereinafter, specific embodiments according to the present invention will be described with reference to the accompanying drawings. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Parts having similar configurations and operations throughout the specification are denoted by the same reference numerals. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

In describing the embodiments in detail, overlapping descriptions or descriptions of obvious technology in the art are omitted. Also, in the following description, when a section is referred to as "comprising " another element, it means that it may further include other elements in addition to the described element unless otherwise specifically stated.

Terms including ordinals, such as first, second, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the second component may be referred to as a first component, and similarly, the first component may also be referred to as a second component.

Insulation housings with a voltage sensing function according to the present invention are recently applied to eco-friendly (ECO) processing switch, etc., is an insulation housing with a built-in voltage sensing sensor in the manufacturing stage. In the following example, as will be described by illustrating a process switch, the insulating housing of the present invention can be applied to a breaker or similar power switch. That is, the power switch device according to the present invention refers to a switch, a circuit breaker, or other device for opening and closing the power including an insulating housing described below.

3 is a side view illustrating an insulating housing according to the present invention. Referring to FIG. 3, a first terminal 110 is installed in front of a housing 100 formed of an insulator, and a second terminal 120 is installed at an upper end of the housing 100. In the present embodiment, the first terminal 110 is a terminal to which the load side lead wire is connected, and the second terminal 120 is a terminal to which the high voltage side lead wire is connected. However, typically, the switch is a device for opening and closing a high pressure side and a low pressure load side. The high pressure side may be connected to the first terminal 110 and the load side may be connected to the second terminal 120.

The first terminal 110 and the second terminal 120 are insulated by bushings 112 and 122, respectively. In addition, the bushing 132 is also installed at the lower end of the housing 100 (that is, the portion installed in the post). These bushings 112, 122, and 132 are cylindrical pipes integrally formed in the housing 100, and prevent the high voltage side voltage and the low pressure side voltage from being induced to the support or other processing facilities.

Opening and closing rod 130 is inserted into the lower end of the housing 100. The opening and closing rod 130 has a rod shape installed along the central axis of the housing 100, and is moved back and forth into the housing 100 by a driving means (not shown) to operate the opening and closing means installed in the housing 100. . The switch is opened or opened by the forward and backward operation of the opening / closing rod 130.

In FIG. 3, the pipe installed at the front of the housing 100 is a ground line installation pipe 142 for receiving a ground line of a current transformer 140 for a meter.

Figure 4 is a side cross-sectional view illustrating the internal configuration of the insulating housing according to the present invention. Referring to FIG. 4, the opening and closing means for opening and closing the connection between the high pressure side and the load side is installed in the housing 100. The opening and closing means includes a first connection terminal 114 connected to the first terminal 110 and a second connection terminal 124 connected to the second terminal 120. The first connection terminal 114 and the second connection terminal 124 are contacted or separated from each other by the opening and closing rod 130 in the space impregnated with the insulating material.

As shown, as the opening and closing rod 130 formed of a ball screw is moved forward and backward, the first connection terminal 114 is moved forward and backward. In this case, the opening and closing rod 130 is composed of an insulator, and prevents the voltage applied to the first connection terminal 114 from being induced to the support side through the opening and closing rod 130. On the other hand, the opening and closing rod 130 is not necessarily limited to the ball screw, it can be replaced by other means for advancing and retreating into the housing 100.

Referring to Figure 4, the current transformer 140 for the instrument is built in the housing 100, like a conventional eco-friendly switch. Instrument current transformer 140 is a transformer for converting a large current into a small current to deliver to the measuring instrument. An instrument current transformer ground line 144 for grounding the instrument current transformer 140 is connected to the lower side along the inner front of the housing 100. On the other hand, the instrument current transformer 140 may be interpreted to include a transformer transformer function. That is, the instrument current transformer 140 referred to in the present invention may be understood to encompass a modification including an instrument transformer function while additionally performing an instrument current transformer function.

Inside the housing 100, a high pressure sensor 150 is installed along the current transformer ground line 144 for the instrument. As shown, one end of the high pressure sensor 150 is connected to the second terminal 120, which is the high pressure side, and the other end is connected to the ground side of the current transformer 140 for the instrument. The sensing line of the high pressure sensing sensor 150 is drawn out along the current transformer ground line 144 for the instrument.

Therefore, there is no need to provide a separate space inside the housing 100 for the high pressure sensor 150. In addition, the current transformer grounding line 144 for the instrument is an idle line that is not normally utilized, and by using the idle line, the high pressure sensor 150 may be installed to increase space utilization. In addition, as shown in the instrument current transformer ground line 144, that is, by installing the installation line of the high pressure sensor 150 in front of the interior of the housing 100, the high pressure of the side phase switch to the high pressure sensor 150 Alternatively, low pressure may not be induced.

The high pressure sensor 150 is a sensing means for sensing the high voltage side that is introduced into the switch, for example, a resistive voltage detector (RVD). The voltage sensing sensor typically includes a RVD that senses a voltage using a partial pressure of a resistor, and a capacitive voltage detector (CVD) that senses a voltage by using a partial voltage of a capacitor. RVD or CVD may be used as the high-pressure sensor 150, but RVD is easier to implement power distribution intelligence, power quality monitoring (PQM), which is a smart grid function, compared to CVD, and preferably RVD is used. do.

Referring to FIG. 4, the low pressure sensor 160 is installed to the rear side opposite to the protruding direction of the first terminal 110. One end of the low pressure sensor 160 is connected to the first terminal 110 side, the sensing line 162 is drawn out to the other end. The sensing line 162 is drawn out to the lower end of the housing 100 and connected to a separate sensing circuit. The low pressure sensor 160 is a sensing means for detecting the load-side low pressure, and may be configured as a resistive voltage sensor like the high pressure sensor 150.

Meanwhile, the aforementioned high pressure sensor 150 and the low pressure sensor 160 are not necessarily limited to the embodiment of FIG. 4. For example, since the high pressure side may be connected to the first terminal 110 and the load side may be connected to the second terminal 120 due to the nature of the switch, the installation position of the high pressure sensor 150 and the low pressure sensor 160 may be It may change with each other.

5 is a front sectional view showing an installation example of the insulating housing according to the present invention, showing an example in which the three-phase processing switch is installed side by side. As shown in FIG. 5, when the protruding portion of the first terminal 110 for the load side connection is referred to as the front, the switch is located sideways to avoid the protruding portion of the first terminal 110. This is due to the spatial constraints of the processing switchgear installed in the air on the shore, due to the constant wiring spacing of the overhead transmission line.

In the insulating housing according to the present invention, at least one voltage sensing sensor is located at the front or the rear in the housing 100. Preferably, as shown in FIG. 4, one voltage sensing sensor is positioned at the front of the housing 100, and the other voltage sensing sensor is positioned at the rear of the housing 100. According to this structure, as in FIG. 5, even when the three-phase processing switchgear are positioned side by side, the voltage sensing sensor is spaced apart from the adjacent switchgear as much as possible.

Therefore, it is possible to prevent the phenomenon that the voltage of the side phase is induced in the voltage sensing sensor as much as possible, and to suppress the phase change and the occurrence of error of the sensing voltage. In addition, as shown in the embodiment of Figure 4 by installing the high pressure sensor 150 along the ground line of the current transformer 140 for the instrument, it is possible to increase the space utilization in the housing 100 and to manufacture the insulating housing small Will be. Furthermore, since there is no need to correct a phase change or an error occurrence at the rear end of the voltage sensing sensor, the configuration of the voltage sensing circuit can be simplified.

The invention described above is susceptible to various modifications within the scope not impairing the basic idea. In other words, all of the above embodiments should be interpreted by way of example and not by way of limitation. Therefore, the scope of protection of the present invention should be determined in accordance with the appended claims rather than the above-described embodiments, and should be construed as falling within the scope of the present invention when the constituent elements defined in the appended claims are replaced by equivalents.

100: housing 110: first terminal
112: bushing 114: first connection terminal
120: second terminal 122: bushing
124: second connection terminal 130: opening and closing rod
132 bushing 140 instrument current transformer
142: grounding line installation pipe 144: current transformer grounding line
150: high pressure sensor 160: low pressure sensor
162: detection line

Claims (6)

In the insulated housing in which the load side lead-in wire and the high-pressure side lead-in wire are respectively introduced, and the opening-and-closing means which opens and closes a connection of a load side and a high voltage side inside is provided,
A housing formed of an insulator;
A first terminal installed at the front of the housing and having a load-side lead wire;
A second terminal installed at an upper end of the housing and having a high-pressure side lead wire;
An opening / closing rod which is inserted into the housing so as to be moved forward and backward and opens and closes the connection between the load side and the high pressure side by operating the opening and closing means;
An instrument current transformer installed in the front of the housing;
A high pressure sensor installed along a ground line of the current transformer for the instrument and connected to the high voltage side lead-in and sensing a voltage applied to the high voltage side; And
It is installed along the rear inside the housing and is connected to the load side lead-in includes a low pressure sensor for sensing the load side voltage,
And the high pressure sensor and the low pressure sensor are resistive voltage detectors (RVDs). delete delete delete delete Power switching device comprising an insulating housing having a voltage sensing function of claim 1.

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