KR100902363B1 - Test terminal blocks and method for checking instrument incorrect connection using the same - Google Patents

Abstract

A test terminal block and a method for confirming instrument misalignment are disclosed, which are installed in a metering device of a high-pressure customer to detect an abnormal signal of three phases and display it as an alarm. According to the present invention, in the test terminal block installed in the customer's metering device, it is installed between the transformer and the meter of the instrument, the three current amount and current for detecting the current amount and current waveform of the three phase (R, S, T) A waveform detection circuit, three voltage and voltage waveform detection circuits for detecting voltages and voltage waveforms of three phases, and voltages (waveforms) detected by the voltage and voltage waveform detection circuits are inputted to determine whether the voltage is above an arbitrary voltage ( Example: 80V) is abnormal, and when connected in the forward direction, the current amount and the current (waveform) detected by the current waveform detection circuit are input to determine whether the current amount is above an arbitrary current value (e.g., 10 mA) and is abnormal. A test logic device (PLD) that performs a current miswiring indication function for detecting a current miswiring and confirming an abnormal signal of each of the R, S, and T phases when the time is satisfied Characterized by providing a terminal block.

Terminal block, transformer for instrument, erroneous wiring, power meter, 3-phase

Description

TEST TERMINAL BLOCKS AND METHOD FOR CHECKING INSTRUMENT INCORRECT CONNECTION USING THE SAME}

The present invention relates to a test terminal block for detecting a three-phase abnormal signal in the terminal block installed in the metering device of the high-pressure customer, and to display this as an alarm and a method for checking the instrument wiring.

In general, high voltage can be directly connected to the electricity meter, so the amount of electricity can't be measured.The voltage (PT: AC110V) three-phase and three-phase current (CT: 0 ~ 5A) can be connected to the electricity meter through the instrument transformer (MOF: Metering Outfit). The test terminal block is installed between the meter transformer and the meter to check the replacement of the meter or the abnormality of the meter transformer without power failure.

At present, the test terminal block detects the state of failure and abnormal condition of the power supply equipment and activates the alarm sound and indicator lamp.The buzzer sounds when the voltage applied to the terminal block drops to 80V or the applied current falls below 10mA. It alerts you to check the status.

However, there is no extraction alarm function at the time of mis-period misconnection, which leads to various problems caused by an additional charge even when there is no fault of the user (customer).

The present invention can fully detect the instrument miswiring of the high-voltage customer, not only to prevent the instrument miswiring that may occur due to the error of the personnel check, but also to easily detect the reverse phase and phase loss of three-phase voltage and current to detect abnormal signals. An object of the present invention is to provide a test terminal block for prompt checking and a method for confirming instrument miswiring using the test terminal block.

Test terminal block of the present invention for achieving the above object,

In the test terminal block installed in the customer's metering device, it is installed between the instrument transformer and the electricity meter, and three current amount and current waveform detection circuits for detecting the current amount and current waveform of three phases (R, S, T), 3 Three voltage and voltage waveform detection circuits for detecting the voltage and voltage waveforms of the phase, and the voltages (waveforms) detected by the voltage and voltage waveform detection circuits are input to determine whether the voltage is above an arbitrary voltage (for example, 80 V). It is judged that it is abnormal and satisfies when the connection is made in the forward direction, and when the current amount and the current detected by the current waveform detection circuit are input and determine whether the current amount is greater than an arbitrary current value (for example, 10 mA). And a program logic device (PLD) for detecting a current miswiring and performing a current miswiring display function for checking an abnormal signal of each of the R, S, and T phases.

The program logic device may receive a voltage detected by the voltage and the voltage waveform detection circuit to determine whether the voltage is greater than or equal to an arbitrary voltage (for example, 80 V), and to determine whether each of the R, S, and T phases is When a low voltage and a voltage phase detection function for checking an abnormal signal, a voltage detected by the voltage and the voltage waveform detection circuit are input, it is determined whether the voltage is above an arbitrary voltage (for example, 80 V), and a reverse phase is detected when it is abnormal. A voltage reverse phase function for checking an abnormal signal of each of the R, S, and T phases against an inverse phase by comparing two phases (two of R, S, and T phases) having a phase difference of 120 ° with a frequency of the voltage waveform; And receiving the current detected by the current amount and the current waveform detection circuit to determine whether the current amount is greater than or equal to a predetermined current value (eg, 10 mA), and when the amount is lower than the corresponding LED on the R, S, and T flashes. Abnormal signal of each phase A low current and a current detection function for imaging confirmation may be further performed.

Instrument miswiring method of the present invention for achieving the above object,
A first step of detecting a current amount and a current waveform of three phases (R, S, T) by a current amount and a current waveform detecting circuit; a second step of detecting a voltage and voltage waveform of a three phase by a voltage and voltage waveform detecting circuit; A third step of detecting the low voltage and the real phase of the voltage phase, displaying the reverse phase of the voltage, and detecting the low current and the real phase based on the detected values of the first and second steps, the detection of the third step A fourth step in which the program logic device displays the current miswiring on the R, S, and T based on the determined value, and a fault indication LED is displayed when the miswiring is displayed by the program logic device after the fourth step and an abnormal signal is generated. And a fifth step of turning on and generating an alarm sound.
In the fourth step, when the voltage waveform detected by the voltage and the voltage waveform detection circuit is input, it is determined by determining whether the voltage of the voltage waveform is greater than or equal to an arbitrary voltage (for example, 80 V), and when connected in the forward direction, the When the amount of current detected by the amount of current and the current waveform detection circuit is input, the current amount is determined to be equal to or greater than an arbitrary current value (for example, 10 mA), and when the error is satisfied, the current erroneous line is detected and displayed. .
Also, in the fourth step, in-phase comparison between the value detected by the voltage and voltage waveform detection circuit and the value detected by the amount of current and the current waveform detection circuit is performed to display the erroneous line through blinking the corresponding LED only when the phase is not in phase. Characterized in that.

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The present invention can completely detect the instrument miswiring, reverse phase, phase loss, etc. of the high-pressure customer can solve the distrust of the customer's metering device and ensure customer trust.

The present invention will be described in more detail based on the accompanying drawings as follows.

In the following description of the present invention, detailed descriptions of well-known functions or configurations will be omitted if it is determined that the detailed description of the present invention may unnecessarily obscure the subject matter of the present invention. And the following terms are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of the user, operator, etc. Accordingly, the meaning of each term should be interpreted based on the contents throughout the present specification. will be.

The test terminal block according to the present invention is installed in a metering device of a high voltage customer, and includes three current amount and current waveform detection circuits, three voltage and voltage waveform detection circuits, and a program logic device (PLD). Each element will be described later with reference to FIGS. 1 to 8.

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1 is a circuit diagram showing a current detection waveform and a waveform of a current phase in a test terminal block according to an embodiment of the present invention.

In the test terminal block for measuring instrument miswiring according to the present invention, three waveform detection circuits of current amount and current phase are configured, and CT1, CT2, CT3 are installed in MOF current output three phases R, S, T (1L, 2L, 3L), respectively. The waveform of the current in A and the amount of current in B are detected. 1 shows an example of one of three circuits in which CT1 is installed on R phase, and in the remaining two circuits, S phase and T phase are disposed instead of R phase, and CT2 and T3 CT on S phase are respectively located on CT1 on R phase. Note the same, except when deployed.

As shown in Fig. 1, the waveform detection circuit of the current amount and current phase of the present invention flows a current of 10 mA to CT1 of R and adds and subtracts VR1, and the -input value of the U1: A comparator of U1: A is obtained from CT1. When the input voltage is lower than the input voltage, a positive waveform of 60 Hz on the MOF R appears at the A pin at the output pin 1 of U1: A. When the waveform passes through the diode of D1, it is applied to R4, R5, and C1. The DC voltage can be obtained at the B position. The current value of the obtained DC voltage is applied to the PLD through the PL1 output terminals S-> PL2 and T-> PL3. In addition, the waveform detected at the A position is applied to the PLD through the SP1 output terminals S-> SP2 and T-> SP3.

The S phase CT2 and the T phase CT3 having the same circuit configuration as the R phase can also obtain waveforms and current amounts of the S and T phases in the same manner as described above, which are applied to the PLD.

2 is a circuit diagram showing a voltage detection circuit and a voltage detection circuit of a test terminal block according to an embodiment of the present invention.

In the test terminal block according to the present invention, three waveform detection circuits of voltage amount and voltage are configured to connect voltages of P1, P2, and P3 on R, S, and T, and the value of voltage at C is the frequency of the voltage at D. Detect the waveform. Figure 2 shows an example of one of three circuits when the voltage of P1 is connected on R. In the other two circuits, instead of the connection between R phase and P1, all of them are identical except for the connection between S phase and P2 and the connection between T phase and P3.

As shown in FIG. 2, the waveform detection circuit of the voltage amount and voltage according to the present invention connects P1 to R and ground to P0 to flow a voltage of 80V on R, whereby the voltage value at the C position is increased. When VR2 is added or fixed to be low, a voltage value of 80V or less can be detected at the C position. The detected voltage value is applied to the PLD through the PL1 output terminals (S-> PL2, T-> PL3).

In the voltage detection circuit of the present invention, when the voltage of the 110V voltage is reduced at P1, the voltage passes through the resistor of R6 and the diodes of D2 and D3. A square wave is detected at the D position. The positive square wave detected at the D position is applied to the PLD through the PP1 output terminals (S-> PP2, T-> PP3). The S phase and the T phase having the same circuit configuration as the R phase are also applied to the PLD by acquiring the voltage amounts and the waveforms of the voltage phases of the S and T phases, respectively, as described above.

3 is a diagram illustrating a configuration of a program logic device (PLD) for a test terminal block according to an embodiment of the present invention.

As shown, the program logic device (PLD) of the test terminal block according to the present invention is composed of U3, U4, U5, U6 elements are organically connected, LED D20 ~ D23 is U3, LED D24 ~ D27 is U4 It can be connected to display the current status of flashing and lighting. The program logic device PLD of the test terminal block receives the voltage detected by the voltage and the voltage waveform detection circuit of FIG. 2 and determines whether the voltage is above an arbitrary voltage (eg, 80 V), and is abnormal, and is connected in the forward direction. 1, the current amount and the current detected by the current waveform detection circuit are inputted, and the current amount is determined to be equal to or greater than a predetermined current value (eg, 10 mA), and the current misalignment is detected only when the two determination results are satisfied. It performs the current miswiring display function to check the abnormal signal of each of R, S, and T phases.
In addition, the program logic device (PLD) of the test terminal block according to the present invention receives the voltage detected by the voltage and the voltage waveform detection circuit of FIG. 2 to determine whether the voltage is greater than an arbitrary voltage (for example, 80V), In this case, the low voltage and voltage phase detection functions for checking the abnormal signals of the R, S, and T phases may be further performed.
In addition, the program logic device (PLD) of the test terminal block according to the present invention receives the voltage detected by the voltage and the voltage waveform detection circuit of FIG. 2 and determines whether the voltage is above an arbitrary voltage (for example, 80 V). By detecting in the reverse phase, and confirming the reverse phase by comparing any two phases (two of R, S, T phases) having a phase difference of 120 ° with the frequency of the voltage waveform detected by the voltage and voltage waveform detection circuit of FIG. The voltage reverse phase function for checking an abnormal signal of each of the R, S, and T phases may be further performed.
In addition, the program logic device (PLD) of the test terminal block according to the present invention receives the current detected by the current amount and the current waveform detection circuit of FIG. 1 to determine whether the current amount is equal to or greater than an arbitrary current value (eg, 10 mA). By flashing the corresponding LEDs on the R, S, and T phases, the low current and the current phase detection function for checking the abnormal signals of the R, S, and T phases may be further performed. On the other hand, the functions performed in the above program logic device (PLD) can be equally applied to the microcontroller unit (MCU).

The results performed in the program logic device PLD as described above will be described in more detail with reference to FIGS. 4 through 8 through the operation of the LEDs D20 to D27. 4 to 8, which will be described later, are used to confirm instrument miswiring through the current amount and current phase waveform detection circuit of FIG. 1, the voltage amount and voltage waveform detection circuit of FIG. 2, and the program logic device of FIG. 3. The method and the display method will be described.

Figure 4 is a flow chart for explaining a method for checking the instrument wiring error according to an embodiment of the present invention.

As shown, the instrument miswiring confirmation method according to the present invention, first, through the three current amount and current phase waveform detection circuit of FIG. 1 and the three voltage amount and voltage waveform detection circuit of FIG. The voltage amount and the waveform of the voltage are detected (ST100 to ST200).

In the current amount and current phase waveform detection circuits, CT1, CT2, and CT3 are provided at MOF current output three phases R, S, and T (1L, 2L, 3L), respectively, and A detects the current waveform and B detects the current amount.

Applying a current of 10 mA to CT1 on R and adding or subtracting VR1, if the -input value of the U1: A comparator is less than the + input voltage of U1: A coming from CT1, the amount of 60Hz on MOF R on output pin 1 of U1: A A positive waveform appears, and when this waveform passes D1, a DC voltage is obtained by R4, R5, and C1. The value of the R phase is determined by the MCU or PLD by 10 mA or more. CT2 and CT3 also obtain waveforms and current values on S and T in the same manner as described above (ST100).

In the voltage detection circuit of the voltage amount and voltage, P1, P2 and P3 are connected on R, S and T, and the value of voltage at C is detected and the frequency waveform of voltage at D is detected.

P1 is connected to ground on P0 to R0, and a voltage of 80V is flowed on R so that VR2 is added and fixed so that the voltage value becomes LOW at the position of C. Then, voltage 80V or less is detected.

At this time, the frequency waveform of R phase stepped down the voltage 110V voltage through R6, and then only the positive waveform of the 110V sine wave by D2 and D3 becomes a square wave. The remaining S and T phases make the same conditions as the R phases (ST200).

After detecting the waveform of the current amount and the phase of the current, and the waveform of the voltage amount and the voltage, the low voltage and phase detection of the voltage phase, the reverse phase display of the voltage, and the low current and phase detection are performed based on the detected results (ST300 to ST400).

First, connect the outputs PL1, PL2, PL3 of the voltage and the voltage waveform detected by the voltage waveform detection circuit to the U3 input of the MCU or PLD, and connect LED D20, D21.D22 to the output, if the voltage on R is 80V or higher. If D20 is on and 80V or less, LED D20 is turned off to indicate the abnormality of R phase.

D21 indicates the S phase and D22 indicates the abnormality of the T phase (ST300).

The outputs PP1, PP2, PP3 on R, S, and T of the voltage and voltage waveform detection circuits are connected to the U3 input of the MCU or PLD and the LED D23 is connected to the output.

The reverse phase of the voltage is detected only when the voltages of the three R, S, and T phases are greater than 80 V, and the R, S, and T phases turn around the rectangular pulses of PP and PP3, which are R and T phase waveforms with a phase difference of 60 Hz and 120 degrees. If it is connected in reverse direction by calculating or comparing with PLD, LED D23 turns on to show reverse phase and R and S phase LEDs D20 and D21 blink.

If it is connected in the forward direction, the reverse phase LED D23 turns off, and the R and T phase LEDs D20 and D21 turn on. When the voltage is reversed, find the flashing voltage phase and change it at the input side of the terminal block.

In the waveform detection circuit of the current amount and current phase, the output of A (SL1, SL2, SL3) is the input of U4, and the LEDs D24, D25, and D26 are connected to the output of U4, and the current of the current phase R, S, T flows more than 10mA. Turn on the LED D24, D25, D26 and turn off the LED if it is below 10mA or there is no current flow (ST500).

Current miswiring of R, S, and T phases can be detected only when R, S, and T phases are 80V or more and are connected in the forward direction, and R, S, and T phases are also flowing more than 10mA.

Comparing the in-phase of P1 and 1S of R phase, P2 and 2S of S phase, and P3 and 3S of T phase (ST600) will be described in detail with reference to FIGS. 6 to 8 described later.

 If an abnormal signal is generated by determining whether an abnormal signal has occurred, a fault LED is lit and an alarm sounds (ST700 ~ ST800).

First, the abnormal signal is one of LED D20, D21, D22 in the low voltage and phase detection of the voltage, or when one or more of LED D23, D25, D25, Occurs when one or more D26s are off, and two or more LEDs D24, D25, and D26 flash in the current miswiring indications on R, S and T.

If such an abnormal signal is generated, the fault indication LED D27 lights up to indicate that there is an error in power integration.

FIG. 5 is a flowchart illustrating in detail a current miswiring display of R, S, and T phases in FIG. 4 according to an exemplary embodiment of the present invention.

First, the reverse phase and incorrect wiring of R, S, T phase can be detected only when R, S, T phase is over 80V and connected in forward direction, and R, S, T phase is also flowing more than 10mA.

As shown in FIG. 5, the current miswiring indications of R, S, and T phases are compared with the phase inversion of P1 and 1S of R phases (ST610). Comparing the statue of (ST620), and at the same time compares the statue of P3 and 3S of T phase (ST630).

FIG. 6 is a flowchart illustrating in detail a miswiring display on R in FIG. 5 according to an embodiment of the present invention.

As shown in FIG. 5, the erroneous display of phase R in FIG. 5 indicates whether SP1 is in phase by connecting SP1, output B of FIG. 1, and PP1, output D of FIG. 2, to the input of U3 of FIG. 3. It determines (ST611-ST612).

If the SP1 is not in phase, output it to the U3 output pin # 13, and use this output as the U4 input to flash the LED D24 of the R phase to display an incorrect wiring (ST613 to ST614).

In addition, if the SP1 is in phase, LED D24 is displayed as lighting (ST615).

FIG. 7 is a flowchart illustrating in detail a miswiring display of the S phase in FIG. 5 according to an embodiment of the present invention.

As shown in FIG. 5, the erroneous display of the S phase in FIG. 5 indicates whether SP2 is in phase by connecting SP2, output B of FIG. 1, and PP2, output D of FIG. 2, to the input of U5 of FIG. Discrimination is made (ST621 to ST622).

If the SP2 is not in phase, output it to the U5 output pin # 17, and use this output as the U4 input to flash the LED D25 on the S phase to display a wrong wiring (ST623 to ST624).

In addition, if the SP2 is in phase, LED D25 is displayed as lit (ST625).

FIG. 8 is a flowchart for explaining in detail a wrong line display of a T phase in FIG. 5 according to an embodiment of the present invention.

As shown in FIG. 5, the erroneous display of phase T in FIG. 5 connects SP3, output B of FIG. 1, and PP3, output D of FIG. 2, to the input of U6 of FIG. 3 to determine whether SP3 is in phase with PP3 as a reference value. (ST631 to ST632).

If the SP3 is not in phase, output it to pin 17 of the U6 output pin, and use this output as the U4 input to flash the LED D26 on the T phase to display a wrong wiring (ST633 to ST634).

In addition, if the SP3 is in phase, LED D26 is displayed as lit (ST635).

Therefore, when the R, S, and T phases are in phase, the current phase is forward and the wiring relationship of the wattmeter becomes P1 = 1S, P2 = 2S, and P3 = 3S, thereby preventing incorrect wiring.

1 is a circuit diagram showing a current detection waveform and a waveform of a current phase in a test terminal block according to an embodiment of the present invention.

2 is a circuit diagram showing a voltage detection circuit and a voltage detection circuit of a test terminal block according to an embodiment of the present invention.

3 is a diagram illustrating a configuration of a program logic device (PLD) for a test terminal according to an embodiment of the present invention.

Figure 4 is a flow chart for explaining a method for checking the instrument wiring error according to an embodiment of the present invention.

FIG. 5 is a flowchart illustrating in detail a current miswiring display of R, S, and T phases in FIG. 4 according to an exemplary embodiment of the present invention.

FIG. 6 is a flowchart illustrating in detail a miswiring display on R in FIG. 5 according to an embodiment of the present invention.

FIG. 7 is a flowchart illustrating in detail a miswiring display of the S phase in FIG. 5 according to an embodiment of the present invention.

FIG. 8 is a flowchart for explaining in detail a wrong line display of a T phase in FIG. 5 according to an embodiment of the present invention.

Claims (8)

In the test terminal block installed in the customer's weighing device, It is installed between the transformer of the instrument and the electricity meter, three current amount and current waveform detection circuit for detecting the current amount and current waveform of three phases (R, S, T), Three voltage and voltage waveform detection circuits for detecting voltage and voltage waveforms of three phases, and When the voltage (waveform) detected by the voltage and the voltage waveform detection circuit is input, the voltage is determined to be equal to or greater than an arbitrary voltage (for example, 80 V), and is abnormal when connected in the forward direction, and in the current amount and current waveform detection circuit. When the detected current (waveform) is input and judges whether the amount of current is more than a certain current value (e.g. 10 mA), and satisfies the time when the error is abnormal, the current misalignment is detected and the abnormal signal of each of the R, S, and T phases is detected. A test terminal block with a programmable logic device (PLD) that performs a current miswiring indication function. The method of claim 1, The program logic device, A low voltage and a voltage for checking an abnormal signal of each of the R, S, and T phases when the voltage and the voltage waveform detection circuit are input to determine whether the voltage is above an arbitrary voltage (eg, 80 V), and when the voltage is below. Phase detection function, When the voltage and the voltage waveform detected circuit are input and the voltage is determined to be equal to or greater than an arbitrary voltage (for example, 80 V), an inverted phase is detected when the voltage is abnormal and the frequency of the voltage waveform has a phase difference of 120 °. A voltage reverse phase function that compares any two phases (two of the R, S, T phases) to identify an abnormal signal of each of the R, S, T phases against the reverse phase, and The current detected by the current amount and the current waveform detection circuit is input to determine whether the current amount is greater than an arbitrary current value (e.g., 10 mA), and if it is below, the corresponding LEDs on the R, S, and T phases blink to form the R, S, and T phases. A test terminal block further comprising a low current and current phase detection function for checking each abnormal signal. The method of claim 1, The program logic device, A test terminal block, characterized in that a miswiring is displayed by flashing a corresponding LED only when the phase is not in phase by comparing in phase with the value detected by the voltage and voltage waveform detection circuit and the value detected by the current amount and the current waveform detection circuit. A first step in which the current amount and current waveform detection circuit detects the current amount and current waveform of three phases (R, S, T), A second step in which the voltage and voltage waveform detection circuit detects the voltage and voltage waveform of three phases, A third step of the program logic device (PLD) detecting the low voltage and the real phase of the voltage phase, displaying the reverse phase of the voltage, and detecting the low current and the real phase based on the detected values of the first and second steps, A fourth step of displaying, by the program logic device, the current miswiring on the R, S, and T phases based on the detected value of the third step, and A fifth step of illuminating a fault LED and generating an alarm sound if an incorrect wiring is displayed by the program logic device after the fourth step and an abnormal signal is generated; Instrument misconnection check method, characterized in that to carry out. The method of claim 4, wherein The fourth step, The voltage waveform detected by the voltage and voltage waveform detection circuit is input to determine whether the voltage of the voltage waveform is greater than or equal to an arbitrary voltage (for example, 80 V), and is abnormal when connected in the forward direction, and the current amount and current waveform detection circuit. The method for checking the wiring of the instrument, characterized in that the current incorrect wiring is detected and displayed when it is satisfied that the time is abnormal by determining whether the current is greater than a predetermined current value (for example, 10 mA). The method of claim 5, The fourth step, Incorrect comparison between the value detected by the voltage and the voltage waveform detection circuit and the value detected by the current amount and the current waveform detection circuit in phase if only the case is not in phase, indicating that the incorrect wiring through the blinking LED checking way. delete delete

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