KR20060013970A - A potable phase-angle tester - Google Patents

Abstract

The present invention provides a portable phase angle meter which is installed in parallel with a terminal of a meter to measure phase angles of voltage and current, and displays the measured voltage and current phase angles numerically.

To this end, the present invention, the buffer unit for increasing the input; A phase compensator divided into two phase compensators, each phase compensator being connected to a respective buffer of the buffer part to correct a phase; A comparison unit divided into two OP amplifiers, each OP amplifier being connected to each phase corrector of the phase correction unit to compare output values; A flip-flop unit which is divided into two flip-flops, each flip-flop connected to each of the op amps of the comparison unit to perform a flip-flop; A frequency corrector for correcting the frequency; An arithmetic processing unit for calculating a measurement of the phase angle based on an output value of the circuit; It consists of a display part which consists of a light emitting diode or a liquid crystal display device on which the measured value calculated by the arithmetic processing part is displayed.

Therefore, according to the present invention configured as described above, by measuring the phase angle easily, the line and the erroneous line can be easily and easily confirmed, and the various conversion data such as power factor is also easily and easily through the measured phase angle. It can be measured.

Description

Portable phase angle meter {A POTABLE PHASE-ANGLE TESTER}

1 is a view showing a portable phase angle measuring device according to an embodiment of the present invention connected to the current and voltage connection terminal,

2 is a schematic block diagram showing the configuration of a portable phase angle measuring instrument according to an embodiment of the present invention;

3 is a detailed circuit diagram showing the configuration of a portable phase angle measuring instrument according to the embodiment of the present invention shown in FIG.

4 is a diagram showing a transformer and a power meter connection diagram;

5 is a voltage, current, and power vector diagram in a normal connection;

Figure 6a is, P ₁ ↔P ₂ O voltage changes showing a wiring, a current, a power vector according to the wiring diagram of Figure 4,

FIG. 6B is a voltage, current, and power vector diagram illustrating a 1S↔3S reverse misconnection according to the connection diagram of FIG. 4;

FIG. 6C is a voltage, current, and power vector diagram illustrating a 1S↔1L reverse misconnection according to the connection diagram of FIG. 4;

FIG. 6D is a voltage, current, and power vector diagram illustrating P ₁ ↔ P ₂ and 1S ↔ 1L changed incorrectly according to the connection diagram of FIG. 4.

<Explanation of symbols for main parts of drawing>

1 --- body,

2 --- phase angle display,

3 --- power switch unit,

5 --- current connector,

6 --- voltage connector,

7 --- connecting lead wire,

8 --- battery compartment,

10 --- power supply,

20 --- buffer part,

30 --- phase correction unit,

50 --- comparator (op amp),

60 --- flip flop (F / F),

70 --- frequency correction unit,

80 --- arithmetic processing unit (CPU),

90 --- indicator.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a phase angle meter, and more particularly, to a portable phase angle meter for measuring and displaying numerically the phase angles of voltage and current.

In the conventional case, when a high voltage customer is newly transferred, a wrongly connected meter is not only difficult to detect a wrong wiring, but is often found after a long period of time. It is a reality that deaths are occurring since the number of years) is almost impossible to collect.

In addition, the wiring of the instrument should be done by the employees of the company. However, the company may only check the wiring after construction because the power failure time of the customer cannot be adjusted.

In addition, in the state where the high-pressure transformer (MOF) is pressurized and operated after a new power transmission, live proximity and connection confirmation are not easy, and therefore, it is very difficult to find a wrong wiring.

In other words, in the case of an incorrect wiring in which the voltage is changed or the power supply / load of the current is changed, it is impossible to read the incorrect wiring by a portable measuring instrument (for example, a voltmeter and an ammeter). In the remote meter reading device AMR, it is impossible to detect a state where the voltage and current connections are changed.

Moreover, in the case of the connection of various equipment of substation and plant construction, it is a reality that confirmation of the wiring is very inconvenient because there is no easy misconnection measuring device.

As a result, conventionally, in order to measure the power consumption of the high-voltage customers, the high-voltage high-current power is converted into low-voltage small-current value through the high-voltage transformer (MOF), and connected to the meter by the connection line. Usage may not be measured. In other words, if the customer is using power after the initial supply of power, it is very difficult to detect a fault in the live state, and it is not possible to use a common measuring instrument (for example, a voltmeter and an ammeter) among the current portable instruments. It is almost impossible to find a wrong line.

The present invention has been made in view of the above, and does not require the access of the high-voltage charger in the live state, and does not require opening at the terminal only in the meter, and easily measures the phase angle to detect all types of incorrect wiring. It is an object of the present invention to provide a portable phase angle meter that can be confirmed.

In order to achieve the above object, the portable phase angle measuring device for measuring the phase angle of the voltage and current by installing in parallel to the terminals of the meter according to the present invention, and displaying the measured voltage and current phase angles numerically, A buffer unit for increasing the number; A phase compensator divided into two phase compensators, each phase compensator being connected to a respective buffer of the buffer part to correct a phase; A comparison unit divided into two OP amplifiers, each OP amplifier being connected to each phase corrector of the phase correction unit to compare output values; A flip-flop unit which is divided into two flip-flops, each flip-flop connected to each of the op amps of the comparison unit to perform a flip-flop; A frequency corrector for correcting the frequency; An arithmetic processing unit for calculating a measurement of the phase angle based on an output value of the circuit; It consists of a display part which consists of a light emitting diode or a liquid crystal display device on which the measured value calculated by the arithmetic processing part is displayed.

Therefore, by measuring the phase angle easily according to the present invention configured as described above, the line and the erroneous line can be easily and easily confirmed.

In addition, various measured data such as power factor can be measured simply and easily through the measured phase angle.

(Example)

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

First, an external form of a portable phase angle measuring device according to an embodiment of the present invention will be described with reference to FIG. 1.

1 shows a portable phase angle meter according to an embodiment of the present invention in which current and voltage connectors are connected.

As shown in FIG. 1, the main body 1 of the portable phase angle measuring instrument according to the present embodiment is made of reinforced plastic, and includes a phase angle display portion 2, a power switch portion 3, and a battery accommodating portion 8. )

In addition, a pair of current connection terminals 5 and a pair of voltage connection terminals 6 having respective lead wires 7 connected to a meter (not shown) are connected to an upper portion of the main body 1. It is.

On the other hand, inside the main body 1, the battery (9V) accommodated in the battery compartment 8 and the essential components (hereinafter, described in detail) of the phase angle measuring device according to the present invention is embedded.

In addition, the phase angle display unit 2 includes a light emitting diode (LED) or a liquid crystal display (LCD), and the measured value of the phase angle measured by the phase angle measuring instrument is displayed numerically (three digits).

Next, the configuration and operation of the phase angle measuring device according to the embodiment of the present invention will be described with reference to FIGS. 2 and 3.

2 is a block diagram schematically showing the configuration of a portable phase angle meter according to an embodiment of the present invention, and FIG. 3 is a circuit diagram showing the configuration of the portable phase angle meter shown in FIG. 2 in detail.

As shown in FIG. 2, the phase angle measuring device according to the exemplary embodiment of the present invention includes a power supply unit 10, a buffer unit 20, a phase correction unit 30, a comparison unit 50, and a flip-flop unit 60. ), A frequency correction unit 70, arithmetic processing unit 80, and display unit 90.

On the other hand, as shown in Figure 3, the buffer unit 20 is divided into two buffers, while increasing the input while removing the cause of Va.

In addition, the phase corrector 30 is divided into two phase correctors, and each phase corrector is connected to each buffer of the buffer unit 20 to correct a phase.

In addition, the comparator 50 is divided into two OP amplifiers, and each OP amplifier is connected to each phase compensator of the phase compensator 30 to compare output values.

In addition, the flip-flop unit 60 is divided into two flip-flops, each flip-flop is connected to each OP amplifier of the comparison unit 50 to perform a flip-flop.

In addition, the frequency correction unit 70 performs a function of correcting the frequency.

Further, the calculation processing unit 80 calculates the measurement of the phase angle based on the output value of the circuit, and the measurement value is displayed on the display unit 90 made of a light emitting diode (LED) or a liquid crystal display (LCD).

Hereinafter, the phase angle at the normal connection and the phase angle at the wrong connection will be described with reference to FIGS. 4, 5, and 6A to 6D.

FIG. 4 shows a transformer and power meter connection diagram, FIG. 5 shows a voltage, current and power vector diagram in a normal connection, and FIGS. 6A to 6D show voltage, current and power vector diagrams in a misconnection.

First, as shown in FIG. 5, the normal phase angle θa = θ at the time of normal connection (when the phase difference due to the power factor is within 30 °).

In addition, a normal measurement value is calculated by the following formula.

P = P₁ + P₂ + P₃

※ The voltages of A, B, and C phases shown in FIG. 4 are Va, Vb, Vc, the currents of each phase are Ia, Ib, Ic, the power factor angles are COS θa, COS θb, COS θc, and the operating power is P, Assuming equilibrium, the following equation holds.

P = P₁ + P₂ + P₃ = Va Ia COS θa + Vb Ib COS θb + Vc Ic COS θc

Since three-phase balanced load, Va = Vb = Vc = V, Ia = Ib = Ic = I,

COS θa = COS θb = COS θc = COS θ (θa = θb = θc = θ),

P = V I COS θ + V I COS θ + V I COS θ = 3V I COS θ

The resulting equation is established.

Figure 6a is a P ₁ ↔P ₂ changes and five voltage showing a wiring, a current, a power vector diagram, showing the five wiring phase (phase difference more than 30 °) angle of θa = θ-120 as described in accordance with the wiring diagram of Figure 4, Since θb = 120 + θ (30 ° or more phase difference), the alarm display function of the miswiring is operated.

FIG. 6B is a voltage, current, and power vector diagram showing 1S↔3S changed incorrect wiring according to the connection diagram of FIG. 4, and as shown, since the incorrect wiring phase angle is θa = 180-θ (phase difference of 30 ° or more). , Alarm display function of wrong wiring is activated.

In addition, FIG. 6C is a voltage, current, and power vector diagram showing a 1S↔1L changed incorrect connection according to the connection diagram of FIG. 4, and as shown, since the incorrect connection phase angle is θa = 120-θ (phase difference of 30 ° or more). , Alarm display function of wrong wiring is activated.

Furthermore, FIG. 6D is a voltage, current, and power vector diagram showing P ₁ ↔ P ₂ and 1S↔1L changed incorrect wirings according to the connection diagram of FIG. 4, and as shown in FIG. Since the phase difference is more than 30 °, the alarm display function for the incorrect wiring is activated.

As described above, the phase angle measuring device of the present invention can measure the phase angles of voltage and current, and has an alarm (blinking) function for a phase angle measurement value (greater than 45 °) of a predetermined range or more. Power factor display with phase angle measurement can also be added.

As described above, according to the present invention, by easily measuring the phase angle to check all types of incorrect wiring, it is possible to prevent the incorrect wiring in advance, reduce unnecessary costs and manpower caused by the incorrect wiring, and reduce the charges of abnormal transactions. In addition to the additional bills, incorrect wiring can prevent the credibility of the re-billing charges.

Claims (1)

In the portable phase angle measuring device installed in parallel with the terminals of the meter to measure the phase angle of the voltage and current, and displays the measured voltage and current phase angle numerically, A buffer unit 20 for augmenting an input, A phase compensator 30, which is divided into two phase compensators, each phase compensator connected to each buffer of the buffer part 20 to correct a phase; A comparator 50 which is divided into two OP amplifiers, each OP amplifier being connected to each phase compensator of the phase compensator 30 to compare output values, A flip-flop unit 60, which is divided into two flip-flops, each flip-flop connected to each of the op amps of the comparison unit 50 to perform a flip-flop, A frequency correction unit 70 for correcting the frequency, An arithmetic processing unit 80 for calculating a measured value of the phase angle based on the output value of the circuit, And a display unit comprising a light emitting diode (LED) or a liquid crystal display (LCD) on which the measured value calculated by the arithmetic processing unit 80 is displayed.

Images