JPH0726776U - Electricity measuring device - Google Patents

Abstract

(57) [Abstract] [Purpose] The purpose is to realize an electric quantity measuring device suitable for measuring an electric quantity in a dangerous place such as a high-voltage line. [Structure] A clamp transformer that detects a current flowing through a power line and outputs it separately for a signal and for a power supply, an input circuit to which a signal output obtained from this transformer is added as a signal under measurement via an isolation transformer, A transmission / reception unit for converting an electric signal to be measured applied to an input circuit through an analog / digital converter and transmitting the signal, and a power supply unit to which an output for power supply of the clamp transformer is added.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electric quantity measuring device, and more particularly to an electric quantity measuring device suitable as a measuring device for measuring current or voltage of a high voltage line.

[0002]

[Prior art]

 There is danger in measuring the current and voltage of power lines, especially high-voltage lines. An AC power supply is generally used as the power supply for the device that measures the amount of electricity, but when using the measurement device outdoors where there is no AC power supply, a normal battery is used as the power supply. However, since the battery is finite, it is necessary to replace the battery in order to carry out continuous measurement for a long period of time, but it is dangerous to measure the current and voltage of the high voltage line as described above. It is a problem to change the battery frequently.

[0003]

[Problems to be solved by the device]

 An object of the present invention is to solve such a problem, and it is an object of the present invention to realize an electric quantity measuring device equipped with a power source unit capable of measuring for a long time. The measuring device according to the present invention is particularly suitable for measuring the quantity of electricity in a dangerous place such as a high voltage line.

[0004]

[Means for Solving the Problems]

 The present invention is a clamp transformer that detects a current flowing through a power line and outputs it separately for a signal and a power supply, and an output for a signal obtained from this transformer is applied as a measured signal via an isolation transformer. A circuit, a transmission / reception section for converting the electric signal to be measured given to this input circuit through an analog / digital converter and transmitting it, and a power supply section to which the power output of the clamp transformer is added. It is a thing.

[0005]

[Action]

 In the present invention, the clamp transformer obtains the signal to be measured, and at the same time, the power source is obtained from the clamp transformer.

[0006]

【Example】

 The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of an embodiment of an electric quantity measuring device according to the present invention when it is used for measuring the current of a high voltage line. This measuring device is installed outdoors in a remote place, and its measured value is wireless. It is designed to be sent to the receiving section. In FIG. 1, reference numeral 1 denotes a current detection unit that detects a current flowing through the high voltage line, and a specific configuration of this current detection unit will be described later. Reference numeral 2 denotes an input circuit provided with a filter, an amplifier, or the like, which is provided as necessary, and amplifies the output signal of the current detection unit 1 to a level matched with the input level of the analog / digital converter in the next stage. Reference numeral 3 is the analog-digital converter described above, which converts the analog signal output from the input circuit 2 into a digital signal.

Reference numeral 4 is a signal converter for receiving the output of the analog / digital converter 3 and converting the output into a signal for wireless transmission, in order to ensure decoding on the receiving side as necessary. Performs code conversion. Reference numeral 5 is a transmission / reception unit having a wireless transmitter and a receiver, and 51 is its antenna. As the transmission / reception unit 5, a low power type is used. Reference numeral 6 is a control unit equipped with a microprocessor for controlling each unit. In this type of measuring device, the measured amount is transmitted periodically or according to an instruction from the receiving side. The control unit 6 also performs these controls.

A power supply unit 7 converts the current detected by the current detection unit 1 into a voltage and boosts / rectifies the current. The rectified voltage is applied as a power source to each part of the measuring device. The power supply unit 7 may include a rechargeable battery as needed.

A specific configuration of the current detector 1 is shown in FIG. In FIG. 2, W indicates a conductor to be measured (high pressure wire). Reference numeral 11 denotes a clamp transformer including a pair of iron cores 11a for clamping the conductor W to be measured and a coil 11b wound around the iron cores. Reference numeral 12 is an insulating transformer having a primary winding 12a and a pair of secondary windings 12b and 12c, and the primary winding 12a is connected to a coil 11b constituting the clamp transformer 11. The insulation transformer 12 has a function of insulating the measured conductor W from each other and a function of separating the voltage taken out from the clamp transformer 11 into a signal and a power source separately. The voltage taken out is applied to the input circuit 2 shown in FIG. 1 for a signal, and the voltage taken out from the other secondary winding 12c is supplied to the power source section 7 shown in FIG.

In such a configuration, a current is constantly flowing through the high voltage wire W which is the conductor to be measured, and this current is taken out by the clamp transformer 11 which constitutes the current detection unit 1 and then the insulation transformer 12 From the secondary winding 12b for the signal to be measured and from the secondary winding 12c for the power supply. The voltage taken out for the power supply is given to the power supply section 7, boosted and rectified, and given as the power supply voltage to each section constituting the measuring apparatus, whereby each section becomes in the operating state. Each part in the operating state operates under the control of the control part 6, and the signal to be measured taken out from the secondary winding 12b of the insulating transformer 12 receives the input circuit 2, the analog-digital converter 3, and the signal. It is given to the transmission / reception unit 5 via the converter 4. The output of the transmitting / receiving unit 5 is transmitted via the antenna 51 periodically or according to an instruction from the receiving side. The receiving side (not shown) receives the radio wave as the value of the current flowing through the conductor W to be measured.

Since a large current usually flows through the conductor to be measured W, it is possible to obtain a sufficient power source for operating the low power transmitter as the transmitter / receiver 5. Considering the minimum current of one day, the power supply unit 7 is provided with a charging battery, so that it is possible to perform continuous transmission.

As described above, there is a danger in measuring the current / voltage of the high voltage line. However, in the present invention, the current of the high-voltage line is taken out as the power source of the measuring device, and the current is used as the power source of the device, so that the power source is always available, and even if it is used for a long period of time, it becomes like a battery power source. It is not necessary to replace the power source frequently, and therefore a very suitable device as a measuring device for measuring the current / voltage of the high voltage line can be obtained.

[0013]

[Effect of device]

 According to the present invention, a power supply can be constantly supplied, and as a result, a measuring device having an effect similar to that of an uninterruptible power supply can be obtained, which is particularly suitable as a current / voltage measuring device for a high-voltage line. .

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the device of the present invention.

FIG. 2 is a configuration diagram of an embodiment of a current detection unit used in the device of FIG.

[Explanation of symbols]

 1 Current Detection Section 11 Clamp Transformer 12 Isolation Transformer 2 Input Circuit 3 Analog-Digital Converter 4 Signal Conversion Section 5 Transmitter / Receiver Section 6 Control Section 7 Power Supply Section

Claims (1)

[Scope of utility model registration request] 1. A clamp transformer that detects a current flowing through a power line and outputs the signal separately for a signal and a power source, and an input circuit to which a signal output obtained from this transformer is added as a signal under measurement via an insulating transformer. An electric quantity comprising a transmitter / receiver for converting the electric signal to be measured given to the input circuit through an analog / digital converter and transmitting the signal, and a power supply to which the power output of the clamp transformer is added. measuring device.