KR100498555B1 - Voltage/current sensor - Google Patents

Abstract

The present invention relates to a voltage / current sensor, and the present invention relates to an insulating epoxy housing installed on the upper side of the base plate, a bus bar mounted on the epoxy housing for energizing primary current and applying a high voltage, and one side of the bus bar. Resistive type voltage divider for measuring voltage by measuring the voltage, and Rogowski coil for measuring current by installing on the other side of the busbar, and terminal connected to one side of Rogowski coil for measuring current. The output characteristic correction unit for connecting the variable resistor and the rated current adjusting resistor to the signal and adjusting the voltage divider ratio between the variable resistor and the rated current adjusting resistor to process the signal to correct the measurement accuracy to the set value or less. The output error that occurs during manufacturing can be easily corrected, and each part of Rogowski coil is assembled at the correct position. It can improve the accuracy. In addition, the influence of the external electric field and the radiation noise of the resistance voltage divider can be minimized, and assembling each component with a fastening screw can increase the overall assemblability. In addition, the lamp driving low voltage end electrode can be separately provided so that the capacitance between the high voltage electrode and the low pressure electrode can be kept constant.

Description

Voltage / Current Sensors {VOLTAGE / CURRENT SENSOR}

 The present invention relates to a voltage / current sensor, and more particularly, to a voltage / current sensor capable of compensating the output characteristics of Rogowski coils and fastening and assembling each component to increase the accuracy of assembly and maintaining a constant capacitance. will be.

There are many ways to measure voltage and current in power systems. CT (Current Transforrmer) and shunt (Shunt), etc. are commonly used as the current measuring device, PT (Potential Transforrmer) is generally used as the voltage measuring device.

CT and PT, which are used for voltage / current measurement in high-voltage / low-voltage switchboards and GIS in power systems, measure the voltage and current by winding coils on magnetic bodies. Due to the use of magnetic materials, CT is not wide in the current measurement range due to saturation phenomena, and varies in size depending on the range of the measurement current, and it is difficult to manufacture small / light weight. PT also uses magnetic material and measures voltage by combining primary high voltage winding and secondary low voltage winding with magnetic circuit. PT has a high risk of accidents due to iron resonance and poor insulation characteristics between high voltage windings and low voltage windings. The necessity of a new voltage / current measuring device is required to compensate for the problems of CT / PT and to miniaturize / lighten / digitize switchboards and gas switchboards (GIS).

Recently, as a new measuring device, a current sensor using the Rogowski coil principle and a voltage sensor using the resistive / capacitive voltage divider principle are mainly known. The current measuring device using the Rogowski coil principle measures current by sensing the voltage induced by mutual inductance by winding the coil on the core core, making it compact and lightweight, without saturation phenomenon, and measuring the current range (10 ~ 2000A). , 2000 ~ 5000A) is very wide. The voltage measuring device using the principle of resistance voltage divider measures voltage by using the voltage divider ratio of high resistance high voltage and low voltage low resistance.

Since the voltage / current measuring device can be compact, it is possible to measure voltage and current at the same time so that it is molded in one epoxy housing to apply an integrated sensor. Compared to the switchgear using a compact design is possible, high functionality and high reliability and safety can be secured. In addition, since the measurement range of the current is large, a large number of species are not required, and it is easy to cope with the load expansion and can be manufactured in the same frame, thereby enabling the standardized design of the switchboard.

1 is a cross-sectional view showing an example of a conventional voltage / current measuring device, Figure 2 is a cross-sectional view showing an example of a conventional Rogowski coil for current measurement.

As shown in the drawing, the conventional voltage / current measuring apparatus includes an epoxy housing 2 for insulation provided on the upper surface of the base plate 1, and a booth installed in the epoxy housing 2 for energizing a load current. A bar bar 3, a resistance voltage divider 10 for measuring voltage and mounted on one side of the bus bar 3, and a voltage divider 10 on the other side of the bus bar 3 to measure current. The Rogowski coil 20 for current measurement and the low voltage stage electrode 30 for driving a lamp which are provided on one side of the resistance-type voltage divider 10 for voltage measurement to check whether voltage is applied are comprised.

The resistance voltage divider for voltage measurement (hereinafter, abbreviated as resistance voltage divider) 10 includes a high pressure shield 11 welded to the busbar 3, a low pressure shield 13 supported by the mold support 12, Low pressure while fixing the high pressure stage resistance 14 assembled in the high pressure shield 11 and the low pressure shield 13, the low pressure resistance 15 molded in the mold support 12, and the low pressure shield 13. However, it consists of a mold support 12 in which a resistor 15 is molded and a signal line 16 for drawing a secondary output voltage to an external terminal of the epoxy housing 2.

Since a high electric field is applied to both ends of the high voltage resistor 14, the high voltage shield 11 and the low voltage shield 13 surround the high voltage resistor 14 to protect the high voltage resistor 14.

Rogowski coil (hereinafter referred to as Rogowski coil) 20 for current measurement includes a core 21 made of a mold as shown in FIG. 2, a coil 22 wound around the core 21, and a coil. A metal pipe supporting the coil 22 by welding the upper shield 23 and the lower shield 24 surrounding the upper surface 22 and the upper shield 23 and the lower shield 24 together with the welding member 25. 26), a signal line 27 for transmitting the secondary output to the terminal portion through the metal tube 26, and an output terminal resistor 28 for outputting the secondary output voltage.

Since the output of the Rogowski coil 20 is a voltage, noise is generated in the output voltage under the influence of an external electric field, so the coil 22 is formed of the upper shield 23 and the lower shield 24 made of metal. Doing.

The low pressure stage electrode (hereinafter, referred to as low pressure stage electrode) 30 for driving a lamp includes a low pressure electrode 31 which encloses the high pressure shield 11 about half, and a metal support 32 supporting the low pressure electrode 31. consist of. The metal support 32 fixes the lower end to the bottom side of the epoxy housing 2.

In the drawings, reference numeral 29 denotes a fixing insert, 40 denotes a secondary output stage box, and 50 denotes a shield cable.

The conventional voltage / current sensor as described above operates as follows.

First, when the high voltage (primary voltage) is applied to the resistance voltage divider 10, the high voltage is applied to the high voltage resistor 12 by the voltage dividing ratio of the high voltage resistor 14 and the low voltage resistor 15. A low voltage (secondary output voltage) is applied to (15), and the primary voltage is measured by sensing the voltage of the low voltage resistor 15 at this time.

Next, when the primary current flows in the busbar 3 molded in the epoxy housing 2, the Rogowski coil 20 is a magnetic flux caused by the primary current in the Rogowski coil 20 surrounding the busbar 3. This interlinked magnetic flux induces an electromotive force of 90 ° out of phase with the primary current to the coil 22 by this interlinked magnetic flux. The primary current is sensed by measuring this electromotive force.

Next, when the high voltage is applied between the high voltage electrode 11 and the low pressure electrode 31, the low pressure terminal electrode 30 generates a capacitance C1 between the electrodes 11 and 31, and the capacitance C2 connected in parallel to the ends thereof. Connected in series. Since the capacitance C2 is much larger than the capacitance C1, a low voltage is induced at the capacitance C2 by the ratio of the two capacitances, and a lamp (not shown) is driven at this voltage.

However, in the conventional voltage / current sensor as described above, first, the Rogowski coil 20 has an alignment winding, a constant pitch, a uniform cross-sectional area in the core core 21, and a constant position of the coil 22 and the busbar 3. It is difficult to use a general relay because the output accuracy is not as high as 3% due to difficulty in manufacturing, and it can be calibrated with accuracy of about 1% when applying a calibrator to use it as a high-precision measurement current sensor. there was. In addition, since the process of welding the fixing metal pipe 26 to the upper / lower shields 23 and 24 and the welding member 25 surrounding the coil 22 is very difficult, it is not only difficult to accurately match the dimensions. Since the metal tube 26 supporting the coil 22 is fixed with one insert 29, the coil 22 surrounding the bus bar 3 and the bus bar 3 are not aligned with each other during assembly. There was a problem that the distance between the busbar and the busbar 3 was not constant, resulting in a drop in the accuracy of the output value.

 On the other hand, the resistive voltage divider 10 is installed between the high-pressure shield 11 and the low-voltage shield 12, the high-pressure stage resistor 14 and the low-pressure stage resistor 15 is a mold support for fixing the low-voltage shield 12 ( 12) there is a problem that the output characteristics are poor because it is easily affected by the external electric field and radiation noise.

On the other hand, the low voltage stage electrode 30 is installed at a position where a high voltage shield 11 of the resistance type voltage divider 10 is used as a high voltage stage and a constant insulation distance from the high voltage shield 11 is set to have a capacitance C1 value. Is determined by the area of the low voltage electrode 31 and the distance between the high voltage terminal (ie, the high voltage shield) 11, but the metal support 32 fixing the low voltage electrode 31 is provided at the lower end of the epoxy housing 2. Since the distance between the low voltage electrode 31 and the high voltage terminal 11 is easily changed even if the bending angle or the assembly angle of the metal support 32 is slightly changed because it is fixed, it is difficult to match the accurate capacitance C1 value, Since the high-pressure shield 11 of the resistive voltage divider 10 is also welded to the busbar 3, it is difficult to assemble at a predetermined position, thereby making it difficult to obtain a more accurate capacitance C1 value.

 The present invention has been made in view of the problems of the conventional voltage / current sensor as described above, to provide a voltage / current sensor that can improve the assembly performance by increasing the precision of Rogowski coil, simplify the structure and improve the support structure It is an object of the present invention.

Another object of the present invention is to provide a voltage / current sensor capable of improving output characteristics by minimizing the influence of external electric field and radiation noise of a resistance voltage divider.

Another object of the present invention is to provide a voltage / current sensor capable of maintaining a constant capacitance value by improving the support structure of the low voltage end electrode.

In order to achieve the object of the present invention, the insulating epoxy housing to be installed on the upper side of the base plate, the bus bar is installed in the epoxy housing to energize the primary current and apply a high voltage, connected to one side of the bus bar voltage Variable resistance and rating for resistance voltage divider for voltage measurement to be measured, Rogowski coil for current measurement installed on the other side of busbar to measure current, and terminal connected to signal wire to one side of Rogowski coil for current measurement. The present invention provides a voltage / current sensor including an output characteristic correction unit for connecting a current adjusting resistor and processing a signal to adjust the voltage division ratio between the variable resistor and the rated current adjusting resistor to correct the measurement accuracy to a set value or less.

Hereinafter, the voltage / current sensor according to the present invention will be described in detail with reference to the embodiment shown in the accompanying drawings.

Figure 3 is a perspective view showing an example of the voltage / current sensor of the present invention, Figure 4 is a cross-sectional view showing the voltage / current sensor of the present invention, Figure 5 is an exploded perspective view showing a Rogowski coil of the voltage / current sensor of the present invention, Figure 6 is a perspective view showing a resistance voltage divider of the voltage / current sensor of the present invention, FIG. 7 is a circuit diagram of a lamp for checking whether or not the present voltage is applied, and FIG. 8 is a circuit diagram showing an output characteristic correction unit of the present invention.

As shown in the drawing, the terminal type voltage / current sensor according to the present invention includes an epoxy housing 2 for insulation provided on the upper surface of the base plate 1 and a load current provided inside the epoxy housing 2. Busbar (3) to energize, resistance voltage divider (110) installed on one side of the busbar (3) to measure the voltage, Rogowski coil installed on the other side of the busbar (3) to measure the current (120), the low voltage end electrode 130 is installed on one side of the resistance voltage divider 110 to check whether the voltage is applied, and connected to one side of the Rogowski coil 120 by a signal line to set the measurement accuracy And an output characteristic correction unit 140 for processing the signal to correct the value below the value.

The busbar 3 is located on the same side as the first busbar connecting terminal 3a and the first busbar connecting terminal 3a, which is installed on the upper surface of the epoxy housing 2 so as to be connected to the circuit breaker. The second busbar connecting terminal 3b to be provided is provided together.

The resistance type voltage divider 110 accommodates an upper portion of the high pressure shield plate 111 for fastening and fastening with a fastening screw N on one side of the bus bar 3, and the upper portion of the high voltage stage resistor 112. 111, a high pressure shield 113 that is tightened and fastened with a fastening screw N, a low pressure shield 114 that receives a lower portion of the high pressure end resistor 112 and is located below the high pressure shield 113, and a low pressure. A low pressure resistance resistor 117 for supporting the shield 114 and receiving the low pressure resistance 115 and fixing the at least two inserts 116 on the upper surface of the base plate 1 and a low pressure resistance ( At 115, a signal line 118 for drawing the secondary voltage to the external terminal of the epoxy housing 2 is formed.

Rogowski coil 120 is an air core core 121 for producing a mold annular as shown in Figure 5, a coil 122 wound around the core core 121, and the upper shield 123A surrounding the coil 122 ) And the lower shield 123B, the upper clamp 123A and the lower shield 123B while electrically conducting the shield clamp 124 mechanically assembled by the fastening screw N, and the upper shield 123A. A fixing plate 125 assembled with screws N to fix the coil 122 at a predetermined position, a fixing insert 126 positioned at an end of the fixing plate 125, and located inside the upper shield 123A. Braided wire shield 127a and braided wire plate 127 to be soldered, a signal wire 128 penetrating the braided wire shield 127a, and a braided wire shield for assembling the braided wire shield 127a to the fixed plate 125. It consists of a clamp 129.

Fixing plate 125 is preferably fixed to at least two or more inserts 126 on the upper surface of the base plate (1).

The low voltage end electrode 130 includes a high voltage electrode rod 131 screwed to the busbar 3, a high voltage electrode 132 integrally fixed to a lower end of the high voltage electrode rod 131, and a high voltage electrode 132. The low pressure electrode 134 is fixed to the upper surface of the base plate 1 by at least two inserts 133, and the wire 135 is connected to the insert 133 by soldering to draw the capacitance C1 to the outside. .

A lamp assembly including a display lamp 136 is connected to the output terminal of the wire 135 as shown in FIG. 7. The display lamp 136 is connected in parallel with the capacitance C2 so as to divide the capacitance C1 between the two electrodes 132 and 134.

The output characteristic correction unit 140 connects the variable resistor 141 and the rated current adjusting resistor 142 to the terminal as shown in FIG. 8, and divides the voltage between the variable resistor 141 and the rated current adjusting resistor 142. The signal is processed to adjust the ratio to correct the measurement accuracy to a set value (for example, 1% or less), and the parallel resistor 143 to the variable resistor 141 to prevent the set value variation or burnout of the variable resistor 141. ), A series resistor 144 is connected to one end of the variable resistor 141, and a surge voltage is applied between the series resistor 144 and the variable resistor 141 and the other end of the variable resistor 141. The surge absorber 145 is connected to prevent the surge voltage from being directly applied to the variable resistor 141 when applied.

In addition, the output characteristic correction unit 140 is installed inside the signal box 150 provided on the bottom outside of the epoxy housing 2, which is connected to the relay through the shield cable 160 to the voltage / current measurement value Is made to deliver.

In the drawings, the same reference numerals are given to the same parts as in the prior art.

The terminal type voltage / current sensor according to the present invention as described above operates as follows.

First, when the primary voltage is applied from the bus bar 3 fixed to the epoxy housing 2, the resistance type voltage divider 110 is connected to the low voltage resistance by the voltage division ratio of the high voltage resistance 112 and the low voltage resistance 115. A low voltage secondary output voltage is generated at both ends of 115). The secondary output voltage is transmitted to the terminal of the epoxy housing 2 through the signal line 118 shielded by the low voltage resistance resistor 117, and the relay input terminal by the shield cable 160 connected to the signal box 150 Is passed on.

Next, when the primary current flows in the busbar 3 fixed to the epoxy housing 2, the Rogowski coil 120 has a magnetic flux generated by the primary current in the coil 122 surrounding the busbar 3. The secondary output voltage is induced in the coil 122, and the induced output voltage is transmitted to the terminal of the epoxy housing 2 through the shielded signal line 128. The signal transmitted to this terminal is transmitted to the output characteristic correction unit 140 mounted in the signal box 150 to be processed. That is, since the measurement accuracy of the Rogowski coil 120 is about 3%, the measurement accuracy is set by adjusting the voltage division ratio between the variable resistor 141 and the rated current adjusting resistor 142 in the output characteristic correction unit 140. Correction is less than (eg 1%). The corrected signal is transmitted to the rated current adjusting resistor 142 so that a constant output voltage at each rating is transmitted to the relay input terminal through the shield cable 160.

In more detail, as shown in FIG. 7, voltages S1 and S2 are applied to the variable resistor 141 and the rated current adjusting resistor 142 having the output voltage connected in series to the Rogowski coil 120, respectively. Since the applied voltage is an output voltage of about 3% of measurement error, in order to obtain an output voltage of less than 1% of measurement error, the capacitance C1 and S2 terminals are obtained by using the resistance ratio of the variable resistor 141 and the constant current adjustment resistor 142. The variable resistor 141 is adjusted to have an output voltage of less than 1% of the measurement error. The output voltage corrected by the variable resistor 141 is the minimum rated current (S2- by the voltage dividing resistors S2-C1, S2-C2, S2-C3, S2-C4 and S2-C5 to the rated current adjusting resistor 142). The voltage is again divided to generate a constant constant output voltage from C1) up to the maximum rated current (S2-C5). At this time, the series resistor 144 and the surge absorber 145 connected to the variable resistor 141 prevent the brain / surge voltage from being directly applied to the variable resistor 141 when the brain / surge voltage is applied, and the parallel resistor. Reference numeral 143 classifies the secondary output current by the secondary output voltage when a large current such as an accident current or a short time current is energized to the busbar 3 to prevent burnout of the variable resistor 141 and variation of the set value in advance. .

Next, when the primary voltage is applied to the bus bar 3 fixed to the epoxy housing 2, the lamp driving electrode 130 capable of confirming whether the voltage is applied is the bus bar 3 by the high voltage electrode rod 131. The primary voltage is applied to the high voltage electrode 132 connected to). The primary voltage is divided by the capacitance C1 generated between the high voltage electrode 132 and the low voltage electrode 134 and the capacitance C2 connected in parallel with the lamp 136 on the lamp end side for checking whether the voltage is applied. Since the capacitance C1 value is very small compared to the capacitance C2 value, most primary voltages are applied between the high voltage electrode 132 and the low voltage electrode 134, and a small voltage capable of driving the lamp 136 is applied to the lamp (136). It is applied to both ends of 136 to drive the lamp 136.

In this way, Rogowski coils can easily correct the output error generated when the Rogowski coil is manufactured by using a variable resistor and a resistor for adjusting the rated current, so that the accuracy of the output can be increased as well as several rated currents using a single Rogowski coil. Can be used. In addition, by assembling each part constituting the Rogowski coil with a fastening screw, the assembly can be assembled at the correct position and the gap with the busbar can be kept constant, thereby further improving output accuracy.

The resistive voltage divider uses a low voltage resistor shield to minimize the effects of external electric field and radiation noise to stabilize the output characteristics, and the low voltage resistor shield not only fixes the low voltage shield but also the high voltage shield for mounting the high voltage shield. By assembling the plate with the fastening screw, the overall assembly can be improved.

 The low pressure electrode for driving a lamp is formed in a structure that completely connects the high voltage electrode to the busbar and completely surrounds the high pressure electrode with a cup-shaped low pressure electrode, and supports the base plate to easily match the capacitance C1 between the high voltage electrode and the low pressure electrode and has insulation. Can increase.

The case of the modification with respect to the voltage / current sensor by this invention is as follows.

That is, in the above-described embodiment, the bus bar connection terminal connecting the breaker and the bus bar connecting terminal connecting the load as the so-called 'terminal sensor' are installed on the same surface. As the bushing-type sensor, the bus bar connecting terminal 3b and the breaker connecting portion 200a for connecting the load are arranged vertically.

That is, the voltage / current sensor 200 of the present modification is similar to the general configuration, operation, and effect of the above-described example, but the busbar connection terminal 3b is installed on the upper surface of the epoxy housing 2 while the circuit breaker connection unit ( 200a) is formed to be negative in a predetermined depth so that the circuit breaker I can be directly inserted into one side. In the figure, 210 is a resistive voltage divider, 22 is a Rogowski coil, and 250 is a signal box.

This is because the terminal type sensor described above is connected to the breaker by the booth at one terminal and the other terminal is connected to the load end side by the booth, while the size of the switchboard is increased, whereas the bushing type sensor according to the present modification has a circular booth and a breaker. As the booths are directly connected, the size of the switchboard can be reduced.

The voltage / current sensor according to the present invention can easily correct an output error occurring during the manufacture of a Rogowski coil, and can increase the output accuracy by assembling each part constituting the Rogowski coil at an accurate position.

In addition, the influence of the external electric field and the radiation noise of the resistance voltage divider can be minimized, and assembling each component with a fastening screw can increase the overall assemblability.

In addition, the lamp driving low voltage end electrode can be separately provided so that the capacitance between the high voltage electrode and the low pressure electrode can be kept constant.

1 is a cross-sectional view showing an example of a conventional voltage / current sensor,

Figure 2 is a cross-sectional view showing a Rogowski coil of a conventional voltage / current sensor,

Figure 3 is a perspective view showing an example of the voltage / current sensor of the present invention,

4 is a cross-sectional view showing a voltage / current sensor of the present invention;

5 is an exploded perspective view showing a Rogowski coil of the voltage / current sensor of the present invention;

6 is a perspective view showing a resistance voltage divider of the present invention voltage / current sensor;

7 is a circuit diagram of the lamp for checking whether the present invention voltage is applied,

8 is a circuit diagram showing an output characteristic correction unit of the present invention;

9 is a cross-sectional view showing another embodiment of the present voltage / current sensor.

** Description of symbols for the main parts of the drawing **

1: base plate 2: epoxy housing

3: busbar 3a: busbar connection terminal of circuit breaker side

3b: load side busbar connection terminal 110: resistance voltage divider for voltage measurement

111: high pressure shield plate 112: high voltage stage resistance

113: high pressure shield 114: low pressure shield

115: low-pressure resistance 116: fixing insert

117: low voltage resistance shield 118: signal wire

120: Rogowski coil for current measurement 121: Core core

122: coil 123A: upper shield

123B: Lower Shield 124: Shield Clamp

125: fixing plate 126: insert for fixing

127: braided wire plate 127a: braided wire shield

128: signal line 129: braided shield plate

130: lamp driving copper low voltage electrode 131: high voltage electrode rod

132: high voltage electrode 133: fixing insert

134: low voltage electrode 135: wire

136: lamp 140: output characteristic correction unit

141: variable resistance 142: rated current adjustment resistance

143: parallel resistance 144: series resistance

145: surge absorber 150: signal box

160: shielded cable

Claims (10)

Insulation epoxy housing to be installed on the upper side of the base plate, Busbars installed in the epoxy housing to conduct primary current and apply high voltage, Resistive voltage divider for voltage measurement connected to one side of the busbar, Rogowski coil for current measurement to be installed on the other side of the busbar to measure the current, Connect the variable resistor and the rated current adjusting resistor to the terminal connected to the signal wire on one side of the Rogowski coil for current measurement, and adjust the voltage division ratio between the variable resistor and the rated current adjusting resistor to adjust the measurement accuracy to below the set value. Voltage / current sensor with output characteristic correction unit for processing the signal. The method of claim 1, An output characteristic correcting unit classifies the secondary output current by the secondary output voltage when an accident current or a large current is energized by the busbar, and a parallel resistor connected to the variable resistor to prevent variation or burnout of a set value of the variable resistor; A series resistor connected to one end of the variable resistor and between the series resistor and the variable resistor and the other end of the variable resistor to prevent a surge voltage from being applied directly to the variable resistor when a surge voltage is applied to the variable resistor. A voltage / current sensor comprising a surge absorber. The method of claim 1, Rogowski coil for current measurement is a coil wound around an air core, assembled by tightening a plurality of annular shields surrounding the coil with a fastening screw, and a fixed plate for fixing the annular shield to a certain height. A voltage / current sensor, characterized by fastening and assembling with a fastening screw on one side of the annular shield, and fastening a braided net shield for receiving signal wires by fastening with a fastening screw on one side of the fixing plate, and fixing the fixing plate to the base plate. The method of claim 3, Assemble a plurality of annular shields with the above-mentioned fastening screws using shield clamps that are held together while electrically conducting them, and the braided wire shields are fastened with the above fastening screws by using a braided wire shield clamp that presses them onto the fixing plate. The plate is located on the back of the annular shield corresponding to the voltage / current sensor, characterized in that the assembling screw to the braided network plate and braided braided plate. The method of claim 3, A voltage / current sensor, characterized in that the fixing plate is fixed to at least two inserts on the upper surface of the base plate. The method of claim 1, Resistive type voltage divider for voltage measurement is fastened by fastening the high pressure shield plate to one side of the busbar with a fastening screw, and fastening the high pressure shield accommodating the upper part of the high voltage end resistor to the high pressure shield plate by fastening with a fastening screw. The low voltage resistor shield for receiving the low voltage resistor connected to the signal line is fixed to the upper surface of the base plate, and the low voltage shield for accommodating the lower portion of the high voltage resistor is placed on the upper surface of the low voltage resistor resistor. Voltage / current sensor. The method of claim 1, A voltage / current sensor, characterized in that the low voltage resistor shield is fixed to at least two inserts on the top surface of the base plate. The method of claim 1, A high voltage electrode rod screwed into the busbar, a high voltage electrode fixed integrally at the bottom of the high voltage electrode rod, a low voltage electrode fixed on at least two inserts on the upper surface of the base plate to accommodate the high voltage electrode, and soldered to the insert And a low voltage electrode for driving the lamp including a wire for drawing the capacitance value to the outside. The method according to any one of claims 1 to 8, One side of the epoxy housing is provided with a first busbar connection terminal for connecting to the breaker and a second busbar connecting terminal for connecting to the load. The method according to any one of claims 1 to 7, On one side of the epoxy housing to form a busbar connecting terminal for connecting to the load, the other side perpendicular to the busbar connecting terminal is formed by forming a circuit breaker connection to a predetermined depth to insert and connect the breaker Voltage / current sensor.