KR100606422B1 - Voltage and current sensing apparatus - Google Patents

Abstract

The present invention relates to a voltage / current measuring apparatus, comprising: a bus bar to which a current to be measured is conducted, a bus bar installed to be spaced apart from the bus bar, and inducing and outputting a voltage proportional to a current flowing through the bus bar; A current sensor including a shield installed to surround the Rogowski coil and shielding the Rogowski coil from external electricity and magnetism, and a fixing plate for fixing and supporting the shield; And a high voltage resistor and a low voltage resistor configured to output the divided voltage by dividing the measurement voltage of the bus bar, which is electrically and mechanically connected to the bus bar, and to which the measurement voltage is applied. A voltage sensor for outputting the voltage at both ends; An epoxy housing formed by molding the bus bar, the current sensor and the voltage sensor with one epoxy insulator; A signal terminal unit separately installed below the epoxy housing to transfer an output signal from the current sensor and the voltage sensor to the outside; And a base plate supporting and fixing the epoxy housing and the signal terminal portion. The present invention can be easily manufactured according to the polarity of the combination sensor molded the voltage / current sensor in one epoxy housing, there is an advantage and effect that can simultaneously solve the management and maintenance problems according to the polarity problem.

Description

Voltage / Current Measurement Device {VOLTAGE AND CURRENT SENSING APPARATUS}

1 is a cross-sectional view showing the structure of a conventional CT.

Figure 2 is a CT installation of the conventional introduction panel.

Figure 3 is a CT installation of the conventional feeder unit panel.

4 to 7 is a view of the voltage / current measuring apparatus according to the present invention,

4 is a cross-sectional view of the voltage / current sensor for the inlet portion.

5 is a sectional view of a voltage / current sensor for a feeder unit.

Figure 6 is a voltage / current sensor installation of the introduction panel.

Figure 7 is a voltage / current sensor installation of the feeder panel.

<Description of the symbols for the main parts of the drawings>

101: busbar 102: ECT shield

103: ECT fixing plate 104: Rogowski coil

105: upper EVT fixing plate 106: high voltage resistance

107: low pressure resistance 108: high pressure shield

109: low pressure shield 110: lower EVT fixing plate

111: epoxy housing 112: secondary output terminal

113: groove 114: both terminals

115: terminal cover 116: terminal protection block

117: base plate 118: ground terminal

119,120,121: signal wire

The present invention relates to a voltage / current measuring device, and in particular, a combination sensor in which a voltage / current sensor for an introduction part and a voltage / current sensor for a feeder are molded in one epoxy housing, and can be easily manufactured according to polarity. The present invention relates to a voltage / current measuring device that can simultaneously solve management and maintenance problems.

In general, there are many ways to measure voltage and current in power systems. CT (current transformar) is used as a current measuring device, and PT (potential transformar) is generally used as a voltage measuring device. Recently, a current sensor using a Rogowski coil and a voltage sensor using a voltage divider have been developed and used in place of CT and PT. Current and voltage sensors have the advantages of higher measurement accuracy, lower risk of accident, and smaller size than general CT and PT.

In general, the voltage / current sensor is installed and used inside the switchboard. Since the polarities of the currents of the panel for the switchboard and the panel for the feeder are opposite to each other, the polarity of the current sensor using the Rogowski coil is also used for the inlet and the switchboard. It should be manufactured and installed according to the feeder panel. The commonly used method is to install the voltage / current in opposite directions when mounting them on the inlet panel and the feeder panel to match the polarity. In this method, the terminal position of the voltage / current and the position of the ground terminal are placed on the panel. Since they are located in opposite directions, maintenance and inspection are difficult.

Hereinafter, the drawings will be described.

1 is a cross-sectional view showing the structure of a conventional CT, Figure 2 is a CT installation of the conventional introduction panel, Figure 3 is a CT installation of the conventional feeder panel, as shown in this, the primary current conducting booth Bar 1, magnetic core 2 surrounding busbar 1, coil 3 wound around magnetic core 2, and 2 for transmitting current measurement values to coil 3 to the outside. It consists of the car terminal part 4, the plate 6 which fixes the epoxy housing 5 and the epoxy housing 5, and the ground terminal 7 formed in the plate 6. As shown in FIG. The terminal face of the epoxy housing 5 has letters K and L for indicating the polarity of the primary current, and the letters k and l for indicating the polarity of the secondary output current are indicated on the secondary terminal.

In the conventional voltage / current sensor as described above, when primary current flows through the busbar 1, magnetic flux is generated in the magnetic core 2, and an induced voltage is generated in the coil 3 by the generated magnetic flux. The secondary current value obtained by dividing the primary current value by the number of turns of the coil flows through the coil 3 by the induced voltage of the coil 3, thereby measuring the primary current.

Conventional in the art mounting method of the CT is the polarity must be the values against each other up to the mounting in the introduction and the feeder unit panel matches, when the polarity going the other way becomes not the amount of power calculated in the relay, many, such as reverse phase, phase loss and ground malfunction A problem occurs.

In the conventional apparatus as described above, in order to match the polarity in the CT, a problem arises in that the inlet and the feeder CTs are manufactured respectively, or when the inlet CT is mounted in the feeder, the apparatus must be reversed in direction.

The present invention has been devised to solve the above-mentioned problems and defects, and it is a combination sensor in which a voltage / current sensor for an introduction part and a voltage / current sensor for a feeder are molded in one epoxy housing. It is an object of the present invention to provide a voltage / current measuring device capable of simultaneously solving management and maintenance problems due to polarity problems.

In order to achieve the above object, the voltage / current measuring apparatus according to the present invention is installed to cover a bus bar conducting a current to be measured and spaced apart from the bus bar, and induces and outputs a voltage proportional to the current flowing through the bus bar. A current sensor having a logo skicoil, a shield installed to surround the logo skicoil to shield the logo skicoil from external electricity and magnetism, and a fixing plate for fixing and supporting the shield; And a high voltage resistor and a low voltage resistor configured to output the divided voltage by dividing the measurement voltage of the bus bar, which is electrically and mechanically connected to the bus bar, and to which the measurement voltage is applied. A voltage sensor for outputting the voltage at both ends; An epoxy housing formed by molding the bus bar, the current sensor and the voltage sensor with one epoxy insulator; A signal terminal unit separately installed below the epoxy housing to transfer an output signal from the current sensor and the voltage sensor to the outside; And a base plate supporting and fixing the epoxy housing and the signal terminal portion.

In addition, a specific embodiment of the present invention includes a logo bar coil current sensor including a bus bar conducting a primary current, a logo logo coil surrounding the bus bar, and a logo ski coil sensing an ECT fixed plate current for fixing the ECT shield; Resistance type consisting of an upper EVT fixing plate for connecting the high voltage side to the busbar, a lower EVT fixing plate fixed to the base plate, and a high pressure shield fixed between the upper and lower EVT fixing plates, a high pressure resistance, a low pressure shield, and a low pressure resistance. A voltage sensor using a voltage divider principle; An epoxy housing molded of the busbar, the current sensor and the voltage sensor with a single epoxy insulator, a secondary output terminal located under the epoxy housing and connected to the Rogowski coil and the low voltage resistance and a signal line, and both sides of the epoxy housing Located in the lower portion and comprises a terminal portion for selectively connecting the signal line of the secondary output terminal, and a terminal cover for protecting the terminal portion.

A groove formed for wiring a signal line of the secondary output terminal is formed in the lower portion of the epoxy housing, and a terminal protection block is formed of an insulator to protect an unused terminal of both lower terminal portions of the epoxy housing. The ground terminal is formed at one end of the base plate.

In the present invention, in the case of the voltage / current sensor for the inlet part, the signal line is drawn out to the left side of the epoxy housing so that the terminal part and the ground terminal are located on the side of the polarity indication mark K, and the voltage / current sensor for the feeder is connected. In the case of polarity, the signal line is connected to the right terminal part of the epoxy housing so that the terminal part and the ground terminal are located on the side of the polarity indication mark L on the opposite side of the introduction part. It is possible to manufacture a voltage / current sensor for a feeder. In addition, since the terminal part and the ground terminal can be manufactured in one direction, when the rear door of the switchboard is opened when the voltage / current is installed in the switchboard, both the ground terminal and the terminal part are visible, thereby facilitating maintenance.

Hereinafter, with reference to the accompanying drawings, the present invention will be described in detail as follows.

4 to 7 are views of the voltage / current measuring apparatus according to the present invention, Figure 4 is a cross-sectional view of the voltage / current sensor for the introduction portion, Figure 5 is a cross-sectional view of the voltage / current sensor for the feeder portion is provided 6 shows a voltage / current sensor installation diagram of the inlet panel, and FIG. 7 shows a voltage / current sensor installation diagram of the feeder panel.

Thus, as shown, bar (bus bar), the booth where the primary current conduction (101) and, surrounding the busbar 101 and ECT fixed plate (fixed plate) that secure the ECT shield (shield), (102) ( 103) and, with the current sensing (sensing) Rogowski coil current sensors consisting of a Rogowski coil (104); The upper EVT fixing plate 105 connecting the high pressure side to the busbar 101, the lower EVT fixing plate 110 fixed to the base plate 117, and the upper and lower EVT fixing plate 105. A voltage sensor using a resistive voltage divider principle composed of a high pressure shield 108, a high pressure resistor 106, a low pressure shield 109, and a low pressure resistor 107 fixed between the 110 and 110; The bus bar 101, a current sensor and a mold for the voltage sensor to the one of the epoxy insulators epoxy housing (epoxy housing) 111 and the Rogowski coil 104 is located in the lower portion of the epoxy housing 111 and a low pressure resistance Secondary output terminals 112 connected to a signal line 120 and 121 and a signal line of the secondary output terminal 112 are located at both lower ends of the epoxy housing 111. And a terminal cover 114 for selectively connecting the 119 and a terminal cover 115 to protect the terminal 114.

In addition, grooves 113 formed for wiring signal lines 119 of the secondary output terminal 112 are formed in the lower portion of the epoxy housing 111, and both terminal portions 114 at the lower ends of the epoxy housing 111 are formed. The terminal protection block 116 is formed of an insulator to protect the unused terminal portion, and the ground terminal 118 is formed at one end of the base plate 117.

Referring to the operation of the Rogowski coil for current measurement in the voltage / current measuring device according to the present invention, when the primary current flows in the busbar 101 fixed to the epoxy housing 111, the busbar 101 The magnetic flux generated by the primary current in the Rogowski coil 104 current sensor is encircled, and the secondary output voltage is induced in the current sensor, and the induced output voltage is the secondary output terminal located at the bottom of the epoxy housing 111. The signal transmitted to the 112 and the second output terminal 112 is transmitted to the terminal portion 114 by the signal line 119 along the groove 113 formed on the bottom of the epoxy housing 111 to be processed. .

And, if the operation of the resistance voltage divider for measuring voltage is described, when the primary voltage is applied to the bus bar 101 fixed to the epoxy housing 111, the high voltage resistor 106 and the low voltage resistor 107 by the voltage divider ratio. A low voltage secondary output voltage is generated across the low voltage resistor 107, and the output voltage is transmitted to the secondary output terminal 112 located at the bottom of the epoxy housing 111 through the signal line 121. The signal transmitted to the output terminal 112 is transmitted to the terminal portion 114 by the signal line 119 along the groove 113 formed in the epoxy housing 111 and processed.

The assembling method of the voltage / current measuring device according to the present invention will be described. In the case of the voltage / current sensor for the inlet part, as shown in FIG. 4, the terminal part 114 and the ground terminal 118 are positioned on the side of the polarity indication mark K. a right side terminal portion of the signal line 119, the epoxy housing 111 epoxy housing 111 connected to the left side terminal section 114 and the output to the left side, and is not used, the assembly of the base plate 117 to the protective And assembling the terminal protection block 116 for safety.

In the case of the feeder voltage / current sensor, as shown in FIG. 5, the signal line 119 is moved to the left side of the epoxy housing 111 so that the terminal portion 114 and the ground terminal 118 are positioned on the side of the polarity indication mark L as opposed to the introduction portion. The lead-out terminal is connected to the left side terminal part 114, the base plate 117 is assembled, and the terminal protection block 116 is assembled to the right side terminal part of the epoxy housing 111 not used.

By using the assembly method according to the present invention, it is possible to manufacture a voltage / current sensor for an introduction part and a feeder using one epoxy housing 111 voltage / current sensor, and the terminal part 114 and the ground terminal 118 Since it can be manufactured in a direction, when the rear door 130 of the switchboard is opened as shown in FIGS. 6 and 7 when the voltage / current is installed in the front panel, both the ground terminal and the terminal part are visible, thereby making maintenance very easy.

In the above-described voltage / current measuring apparatus according to the present invention, the secondary output terminal 112 is positioned on the bottom of the voltage / current sensor, and the terminal 114 which sends the secondary output to the relay is provided on both sides of the voltage / current sensor. The positioning allows the manufacture of the voltage / current sensor with the desired polarity.

In the case of the voltage / current sensor manufactured as described above, the base plate 117 for positioning the ground terminal 118 and the terminal portion 114 toward the K side, and for the feeder voltage / current sensor, fixes the epoxy housing 111. When the epoxy housing 111 is assembled in the opposite direction to the inlet part, the position of the ground terminal 118 and the terminal part 114 is located in the L-direction, so that only the voltage / current sensor made of one epoxy housing 111 is used. Solve management and maintenance problems due to polarity issues.

Conventional current / voltage measuring CT and PT are inductive devices in which a coil is wound around a magnetic core, and both have polarities according to the winding direction of the coil, and a magnetic core and a coil in the case of a voltage divider for a current / voltage sensor Since no polarity problem occurs, the Rogowski coil for current measurement does not use a magnetic core, but a polarity problem occurs because a coil is used like a general CT. In the present invention, a combi-type sensor in which a voltage / current sensor is molded in one epoxy housing can be easily manufactured according to the polarity, and the ground terminal and the secondary terminal part are manufactured to be positioned in the same direction and maintained. Can be facilitated.

In the case of the voltage / current sensor, in order to solve the polarity matching and the maintenance problem at the same time, it should be manufactured in two types separately for the introduction part and the feeder, but in order to solve this problem, the present invention has a secondary output terminal for voltage / current. The terminal part which is located on the bottom of the sensor and sends the secondary output to the relay can be installed on both sides of the voltage / current sensor, so that the voltage / current sensor can be manufactured with the desired polarity. In case of feeder, assembling the terminal part and the grounding terminal to the opposite direction to the inlet part, the position of the terminal part and the grounding terminal is in the L direction, so only the voltage / current sensor made of one epoxy housing There are advantages and effects to solving maintenance problems at the same time.

Claims (4)

A bus bar to which the current to be measured is conducted, the bus bar is spaced apart from the bus bar, and a logo ski coil which induces and outputs a voltage proportional to the current flowing through the bus bar, and shields the logo ski coil from external electricity and magnetic. A current sensor having a shield installed to surround the Rogowski coil and a fixing plate for fixing and supporting the shield; And a high voltage resistor and a low voltage resistor configured to output the divided voltage by dividing the measurement voltage of the bus bar, which is electrically and mechanically connected to the bus bar, and to which the measurement voltage is applied. A voltage sensor for outputting the voltage at both ends; An epoxy housing formed by molding the bus bar, the current sensor and the voltage sensor with one epoxy insulator; A signal terminal unit separately installed below the epoxy housing to transfer an output signal from the current sensor and the voltage sensor to the outside; And a base plate for supporting and fixing the epoxy housing and the signal terminal part. The voltage / current measuring apparatus of claim 1, wherein a groove for wiring a signal line of the secondary output terminal is formed under the epoxy housing. 2. The voltage / current measuring apparatus of claim 1, wherein a terminal protection block is formed of an insulator to protect unused terminal portions of both terminal portions of the lower ends of the epoxy housing. The voltage / current measuring apparatus of claim 1, wherein a ground terminal is formed at one end of the base plate.

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