KR20090044936A - Integrated instrumentation apparatus having the function of both ac and dc instrumentation - Google Patents

Abstract

The present invention relates to a complex measuring device having an alternating current and direct current measuring function installed in the rectifier panel of the switchgear and configured to measure the AC measuring component input to the rectifier and the DC measuring component output from the rectifier in one device.

The composite measuring device according to the present invention measures an AC voltage and a current at an input of a rectifier and directly before a battery connected in parallel with an output terminal of a rectifier and a first shunt resistor provided directly behind a DC voltage and an output at the output of the rectifier. The voltage applied to each of the second shunt resistors connected to each other is measured, and information about AC voltage, current, power, amount of electricity, total harmonic distortion (THD), frequency, and phase, etc., and DC voltage, DC measurement component, Characterized in that it can be configured to measure all the information about the DC output current, and the battery charge and discharge current.

Rectifier, alternating current, direct current, composite, measuring device

Description

INTEGRATED INSTRUMENTATION APPARATUS HAVING THE FUNCTION OF BOTH AC AND DC INSTRUMENTATION

The present invention relates to a complex measuring device having an alternating current and direct current measuring function which is installed in a rectifier panel of a switchgear and configured to measure an AC measuring component input to the rectifier and a DC measuring component output from the rectifier in one device.

In order to secure the stability of important equipment of power system such as relay, it is common to supply DC power using rectifier and battery.

The rectifier panel converts AC power into DC to supply DC power, and normally supplies a stable power by charging the battery and supplying DC power through an emergency battery such as an AC power failure. The rectifier panel consists of a rectifier for converting alternating current into direct current and a battery for storing and discharging emergency direct current power in general, and a number of single measurement elements for alternating current voltage, direct current voltage, output current and battery charge / discharge current. The measurement component is displayed using a panel meter having a.

1 is a view showing a conventional rectifier panel configuration.

As mentioned above, the conventional rectifier panel is composed of a rectifier, a battery, and a panel meta, and the panel meta is provided with a plurality of measuring devices. A plurality of measuring devices provided in the panel meta are devices for measuring values for an input AC voltage and a current, an output DC voltage and a current, and a battery charge / discharge current. Therefore, if the measuring element is increased due to the large number of measuring devices in the panel meta, it is economical to use several devices, inadequate perforation space of the panel, wiring problems between devices, and difficulty in implementing communication. do.

In the past, a separate measuring device must be used for each measuring element, so if the number of measuring elements is increased, the economical problem of using multiple devices, inadequate space for panel perforation, problems in wiring between devices, difficulty in implementing communication, etc. This is accompanied by

In addition, the measurement element values measured using a plurality of devices are configured to be displayed only through the display means provided in the rectifier panel, there is a disadvantage that it is not easy to monitor the measurement element values in the upper panel.

Therefore, a problem solving means according to the present invention is to provide a complex measuring device having an AC and DC measuring function capable of measuring both the AC measuring component and the DC measuring component to facilitate the measurement in the rectifier panel.

The present invention also provides a composite measuring device having an alternating current and a direct current measuring function having a function of transmitting an alternating current measuring component and a direct current measuring component to a far upper monitoring station.

In order to achieve the above problem solving means, a composite measuring device having an alternating current and direct current measurement function according to the present invention includes a PT (Potential Transformer) unit for transforming the AC voltage input to the rectifier according to a preset PT ratio; A CT (Current Transformer) unit for converting and outputting the AC current input to the rectifier in accordance with a predetermined CT ratio; A resistor voltage dividing circuit unit for dividing the DC voltage output from the rectifier according to a predetermined resistance ratio and outputting the divided voltage; The voltage difference between the two voltages is input to the first shunt resistor connected directly to the output terminal of the rectifier and the second shunt resistor connected to the immediately preceding end of the battery connected in parallel with the output terminal of the rectifier. A differential input circuit unit for outputting a; A key input unit including a plurality of input keys to receive information from a user; And inputting information on the PT ratio, the CT ratio, the current-to-voltage ratio flowing through the Shunt resistor, and an AC system scheme through the key input unit, and using the received information, the PT unit, the CT unit, the And a control unit for analyzing the resistance divided circuit unit and the value output from the differential input circuit unit to measure the AC measurement component and the DC measurement component of the rectifier.

Here, the AC measurement component measured by the control unit includes one or more of information about AC voltage, current, power, amount of power, THD (Total Harmonic Distortion), frequency, and phase, and the DC measurement component is DC It includes information on any one or more of the information on the voltage, current, and battery charge and discharge current.

And a communication unit configured to perform data communication with a higher supervision panel, wherein the control unit controls the communication of the communication unit to transmit the measured AC measurement component and the DC measurement component to the upper monitoring panel through the communication unit. Can be.

The communication unit is characterized in that for transmitting and receiving data through a serial communication protocol.

The complex measurement apparatus according to the present invention may further include a nonvolatile memory, wherein the controller is configured to store the maximum and minimum values of the AC measurement component and the DC measurement component measured using the nonvolatile memory, and the communication unit. According to an external request input through the non-volatile memory can be configured to have a function of extracting the requested value of the maximum value and the minimum value of the AC measurement component and the DC measurement component stored in the non-volatile memory to provide through the communication unit. .

The present invention provides a composite measuring device capable of measuring both the AC measuring component and the DC measuring component so that the AC measuring component and the DC measuring component can be more easily measured in the rectifier panel. Therefore, the composite measuring device according to the present invention is applied to the rectifier panel to solve the cost, space, and wiring problems caused by using a plurality of measuring devices of the conventional AC measuring component and the DC measuring component.

In addition, the composite measuring device according to the present invention has a built-in communication function to provide information on the AC measurement component and DC measurement component measured by the remote control panel in the far distance to monitor the rectifier panel status from a remote location.

Hereinafter, with reference to the accompanying drawings will be described the present invention in more detail. However, in describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted.

2 is a view illustrating a rectifier panel configuration to which a composite measuring device having an AC and DC measurement function according to the present invention is applied. As shown in the drawing, the rectifier panel charges and discharges a DC voltage output from the rectifier. And a composite measuring device having alternating current and direct current measuring functions.

The composite measuring device according to the present invention measures the AC voltage (VA, VB, VC) and the current (IA, IB, IC) at the input of the rectifier and the DC voltage (VDC), the first shunt (Shunt) at the output of the rectifier. The resistance DC voltage VS1 and the second shunt resistance DC voltage VS2 are measured to measure AC voltage, current, power, power amount, total harmonic distortion (THD), frequency, and phase, which are AC measurement components. It has a form capable of measuring information and information on DC voltage, DC output current, and battery charge / discharge current which are DC measurement components.

FIG. 3 is a diagram illustrating a configuration of a complex measurement device having an AC and DC measurement function according to the present invention. Referring to FIG. 3, a configuration of a complex measurement device that may be used in a rectifier panel will be described in more detail. do.

The composite measuring device having an AC and DC measurement function according to the present invention includes an AC voltage input port 300, a PT unit 302, an AC current input port 304, a CT unit 306, and a DC voltage input. Port 308, resistance divider circuit portion 310, shunt resistor voltage input port 312, differential input circuit portion 314, display portion 316, key input portion 318, and nonvolatile memory ( 320 (eg, a FRAM: Ferro-electric Random Access Memory), a communication unit 322, and a control unit 324.

The PT (Potential Transformer) unit 302 transforms the magnitude of the AC three-phase voltage, which is an input signal of the rectifier input through the AC voltage input port 300, in accordance with the PT ratio and outputs it.

The CT (Current Transformer) unit 306 converts the magnitude of the AC three-phase current, which is an input signal of the rectifier input through the AC current input port 304, in accordance with the CT ratio and outputs the current.

The resistor voltage dividing circuit 310 divides the magnitude of the DC voltage, which is an output signal of the rectifier input through the DC voltage input port 308, into a predetermined resistance ratio, and outputs the divided DC voltage magnitude.

The shunt resistor voltage input port 312 receives a voltage applied to a first shunt resistor connected immediately after the output terminal of the rectifier and a second shunt resistor connected directly to the battery terminal connected in parallel to the output terminal of the rectifier.

The differential input circuit unit 314 receives a voltage applied to the first shunt resistor and a voltage applied to the second shunt resistor input to the shunt resistor voltage input port 312 and outputs a voltage difference value between the two voltages.

The key input unit 318 includes a plurality of input keys, and is input from the PT unit 302, the CT unit 306, the resistance voltage divider circuit unit 310, and the differential input circuit unit 314 by the controller 324. It is used to receive information such as PT ratio, CT ratio, current-to-voltage ratio flowing through the shunt resistor, and the AC system method, which are necessary information to interpret the values. In addition, the key input unit 318 is a means for the user to input the setting information necessary for performing the communication of the communication unit 322 including the communication address information to the control unit 324.

The controller 324 stores the information input through the key input unit 318, that is, the PT ratio, the CT ratio, the current-to-voltage ratio flowing through the shunt resistor, and the AC system scheme in the nonvolatile memory 320, and stores the information. Analyze values input from the PT unit 302, CT unit 306, resistance divider circuit unit 310, and differential input circuit unit 314 using the input power, in addition to the AC voltage and current values input to the rectifier. It measures the amount of power, THD, frequency, and phase, and the DC current and battery charge / discharge current values in addition to the DC voltage output from the rectifier.

The control unit 324 provides information on the input AC voltage, current, power, amount of power, THD, frequency, and phase of the rectifier corresponding to the measured AC measurement component, and the output DC of the rectifier corresponding to the measured DC measurement component. Information on the voltage, current, and battery charge / discharge current is displayed on the display unit 316.

In addition, the control unit 324 controls the communication of the communication unit 322 according to the communication setting information received through the key input unit 318, the information on the measured AC measurement component and DC measurement component to the communication unit 322 To be transmitted to the upper panel. Here, the communication unit 322 is characterized in that for transmitting and receiving data using a serial communication protocol.

The control unit 324 provides the measured AC measurement component and the DC measurement component to the display and upper monitoring panel, and simultaneously stores the maximum and minimum values of the measured AC measurement component and the DC measurement component to the nonvolatile memory 320. In addition, when a request for the maximum or minimum value is received from the outside through the communication unit 322, the controller 322 also provides a corresponding value stored in the nonvolatile memory 320.

As described above, the present invention provides a composite measuring device capable of measuring both the AC measuring component and the DC measuring component so that the AC measuring component and the DC measuring component can be more easily measured in the rectifier panel.

Accordingly, the composite measuring device according to the present invention can be applied to the rectifier panel to easily measure the AC measuring component and the DC measuring component with one device. In addition, the composite measuring device according to the present invention has a built-in communication function to provide information on the AC measurement component and DC measurement component measured by the remote control panel in the far distance to monitor the rectifier panel status from a remote location.

Although the present invention has been described in detail with reference to exemplary embodiments above, those skilled in the art to which the present invention pertains can make various modifications to the above-described embodiments without departing from the scope of the present invention. I will understand. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims below and equivalents thereof.

1 is a view showing a conventional rectifier panel configuration,

2 is a view showing a rectifier panel configuration to which a composite measuring device having an alternating current and direct current measurement function according to the present invention is applied, and

3 is a diagram showing the configuration of a composite measurement device having an AC and DC measurement function according to the present invention.

* Explanation of symbols for main parts of the drawings

300: AC voltage input port 302: PT part

304: AC current input port 306: CT part

308: DC voltage input port 310: resistance voltage divider circuit

312: shunt resistor voltage input port 314: automatic input circuit

316: display unit 318: key input unit

320: non-volatile memory 322: communication unit

324: control unit

Claims (5)

A PT (Potential Transformer) unit for converting and outputting an AC voltage input to the rectifier according to a preset PT ratio; A CT (Current Transformer) unit for converting and outputting the AC current input to the rectifier in accordance with a predetermined CT ratio; A resistor voltage dividing circuit unit for dividing the DC voltage output from the rectifier according to a predetermined resistance ratio and outputting the divided voltage; The voltage difference between the two voltages is input to the first shunt resistor connected directly to the output terminal of the rectifier and the second shunt resistor connected to the immediately preceding end of the battery connected in parallel with the output terminal of the rectifier. A differential input circuit unit for outputting a; A key input unit including a plurality of input keys to receive information from a user; And The PT unit, the CT unit, and the resistor are inputted with the PT ratio, the CT ratio, the current-to-voltage ratio flowing through the Shunt resistor, and information about an AC system scheme through the key input unit. And a control unit for analyzing a voltage dividing circuit unit and a value output from the differential input circuit unit and measuring an AC measuring component and a DC measuring component of the rectifier. According to claim 1, Further comprising: a communication unit for performing data communication with the upper monitoring panel, And the control unit controls the communication of the communication unit to transmit the measured AC measurement component and the DC measurement component to the upper monitoring panel through the communication unit. The method of claim 2, The communication unit, Complex measurement device having an AC and DC measurement function characterized in that the data transmission and reception via a serial communication protocol. The method of claim 2, It further comprises a non-volatile memory, The control unit The AC measurement component and DC measurement stored in the nonvolatile memory according to an external request input through the communication unit by storing the maximum and minimum values of the measured AC measurement component and DC measurement component using the nonvolatile memory. Complex measurement device having an AC and DC measurement function, characterized in that for extracting the requested value of the maximum value and the minimum value of the component provided through the communication unit. According to claim 1, The AC measurement component Includes information on any one or more of AC voltage, current, power, power amount, THD (Total Harmonic Distortion), frequency, and phase; The DC measurement component A composite measuring device having an AC and DC measurement function, characterized in that it comprises at least one of information on DC voltage, current, and battery charge / discharge current.

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