TW201514509A - Discharge frequency domain sensing device and on-line discharge diagnostic monitoring apparatus for oil-filled transformers using the same - Google Patents

Abstract

The invention relates to a discharge frequency domain sensing device and on-line discharge diagnostic monitoring apparatus for oil-filled transformers using the same. The discharge frequency domain sensing device comprises: a sensor for sensing an abnormal discharge signal, a receiver connected to the sensor for receiving the abnormal discharge signal, and a signal intensity indicator connected to the receiver for displaying the abnormal discharge signal, wherein the sensor comprising two monopole antennas and a loop antenna, a first terminal of the two monopole antennas and loop antenna connected to each other, a second terminal of the two monopole antennas opened, and the first terminal and a second terminal of the loop antenna connected to the receiver.

Description

Discharge frequency domain sensing device and on-line discharge diagnosis of oil transformer using same Monitoring equipment

The invention relates to a discharge frequency domain sensing device, in particular to a discharge frequency domain sensing device suitable for an oil-type transformer line discharge diagnostic monitoring device.

A general ultra high frequency (UHF) sensing device has a sensing characteristic region in the frequency domain range of several tens of hertz to several kilohertz, and the measurement is due to interference of the surrounding environment and a similar frequency domain. It is easy to cause mutual interference.

For example, oil-type transformers are a large, closed-type transformer. Due to the closed operation, the normal operation of the oil-type transformer, or the occurrence of abnormal signals or faults, are related to the safety of the entire set of parts and the surrounding environment. During operation, the personnel cannot judge the oil type by the appearance. Whether the transformer is abnormal or turned on to monitor the oil transformer for faults or for long-term monitoring by personnel.

Therefore, in view of this, the discharge frequency domain sensing device developed by the inventor of the present invention and the oil-type transformer on-line discharge diagnostic monitoring device using the same It is non-invasive, can be installed outside the transformer, has high mobility and does not affect its operation, can be monitored, can immediately watch the oscilloscope record and analyze the waveform. It can judge whether the signal is generated according to the discharge characteristic of the oil transformer. A discharge frequency domain sensing device capable of effectively measuring and defining a discharge abnormality signal and an oil discharge diagnostic on-line diagnostic monitoring device using the same.

The main object of the present invention is to provide a discharge frequency domain sensing device, comprising: a sensor for sensing an abnormal discharge signal; a receiver connected to the sensor to receive the abnormal discharge signal; and a a signal strength indicator connected to the receiver to display the abnormal discharge signal; wherein the sensor comprises two monopole antennas and a loop antenna, the two monopole antennas and the first end phase of the loop antenna Connected, the second ends of the two monopole antennas are vacant, and the first end and the second end of the root loop antenna are connected to the receiver.

In addition, the sensor is an ultra high frequency sensor.

Moreover, the sensing frequency of the sensor ranges from 10 MHz to 1 GHz.

In addition, the abnormal discharge signal sent by the receiver to the signal strength indicator is an analog signal.

In addition, the signal strength indicator is an oscilloscope.

In addition, the sensor's reflection loss is -35dB.

Furthermore, the sensitivity of the sensor is -85 dBm.

In addition, the monopole antenna or the loop antenna is formed by winding an iron core with an enameled wire.

Another object of the present invention is to provide an oil-type transformer line discharge diagnostic monitoring device, comprising: a first discharge frequency domain sensing device attached to a grounding wire of an oil-type transformer for sensing the oil type The transformer casing and the core are abnormally discharged to the ground; a second discharge frequency domain sensing device is attached to the extended grounding wire of the first short-circuit coil in the oil-type transformer for sensing the oil-type transformer coil to the ground An abnormal discharge; and a power source connected to the second short-circuit coil in the oil-type transformer to provide a power source; wherein each of the first and second discharge frequency-domain sensing devices comprises: a sensor for Sensing an abnormal discharge signal; a receiver connected to the sensor to receive the abnormal discharge signal; and a signal strength indicator connected to the receiver to display the abnormal discharge signal; wherein the sensor comprises two a monopole antenna and a loop antenna, wherein the two monopole antennas are connected to the first end of the loop antenna, and the second ends of the two monopole antennas are connected, the first end of the loop antenna and the first end Two-terminal connection Receiver.

Thereby, the discharge frequency domain sensing device of the present invention and the oil-type transformer on-line discharge diagnostic monitoring device using the same can diagnose the discharge abnormality of the oil transformer through the discharge frequency domain sensing device, and the discharge frequency domain sensing is performed through the discharge frequency domain sensing device. The device senses the leakage or disturbance caused by the abnormal discharge of the oil-type transformer, and measures and combines the monopole antenna and the loop antenna to enhance the sensing bandwidth range and highlight the response characteristic of the oil-type transformer discharge abnormality. To effectively detect the normal operation of the oil-type transformer.

The above summary and the following detailed description are exemplary in order to further illustrate the scope of the invention. Other objects and advantages of the present invention will be described in the following description and drawings.

1,5,6‧‧‧ sensor

2‧‧‧ Receiver

3‧‧‧Signal strength indicator

4‧‧‧ oil transformer

7‧‧‧Power supply

8,10‧‧‧Short-circuit coil

9,13‧‧‧ iron core

11‧‧‧Monopole antenna

12‧‧‧ loop antenna

14‧‧‧Enameled wire

111, 121‧‧‧ first end

112, 122‧‧‧ second end

1 is a schematic diagram of a discharge frequency domain sensing device of the present invention.

2 is a schematic structural view of a sensor of the present invention.

3 is a schematic diagram of an on-line discharge diagnostic monitoring device of the oil type transformer of the present invention.

Please refer to FIG. 1 , which is a schematic diagram of a discharge frequency domain sensing device according to the present invention. The discharge frequency domain sensing device includes: a sensor 1 , a receiver 2 and a signal intensity indicator 3 , and the sensor 1 For sensing an abnormal discharge signal, which can be an ultra-high frequency sensor and having a sensing frequency ranging from 10 MHz to 1 GHz, a reflection loss of -35 dB, and a sensitivity of -85 dBm, the receiver 2 is connected to the above sensing. The device 1 is configured to receive the abnormal discharge signal, and the signal intensity indicator 3 is connected to the receiver 2 to display the abnormal discharge signal, wherein the abnormal discharge signal sent by the receiver 2 to the signal strength indicator 3 is an analog signal. The signal strength indicator 3 can be an oscilloscope.

Please refer to FIG. 2 , which is a schematic structural diagram of a sensor according to the present invention. The sensor 1 includes two monopole antennas 11 and a loop antenna 12 , and the monopole antenna 11 or the loop antenna 12 can be wound by an enameled wire 14 . The first end 111 of the two monopole antennas 11 and the first end 121 of the loop antenna 12 are connected to each other, and the second end 112 of the two monopole antennas 11 are vacant, and the loop antenna 12 is The first end 121 and the second end 122 are connected to the receiver 2, and according to the whole of the monopole antenna 11 and the loop antenna 12 In combination, the sensing characteristics range from 10MHz to 1GHz, the reflection loss is -35dB, and the sensitivity is -85dBm. Therefore, the bandwidth range can be greatly increased to wide-band type, in oil-type, dry-type transformers, and gas-insulated. The discharge detection of power facilities such as substation (GIS) has the best frequency domain interval, and the characteristic of the discharge can be optimally responded, so it is suitable for the UHF sensor of the present invention.

Please refer to FIG. 3 , which is a schematic diagram of an oil-type transformer line discharge diagnostic monitoring device using the discharge frequency domain sensing device of the present invention, wherein the oil-type transformer line discharge diagnostic monitoring device comprises: a first discharge frequency domain sensing device 6. A second discharge frequency domain sensing device 5, and a power source 7, wherein the first discharge frequency domain sensing device 6 is attached to a grounding wire of an oil-type transformer 4, and the grounding wire is connected to the oil-type transformer The outer casing and the core 9 of the fourth discharge frequency sensing device 6 are used to sense the abnormal discharge of the oil transformer casing and the core 9 to the ground, and the second discharge frequency domain sensing device 5 is attached to the second discharge frequency domain sensing device 5 The extension grounding line of the short-circuit coil 8 in the oil-type transformer 4 is such that the second discharge frequency-domain sensing device 5 is used to sense abnormal discharge of the oil-type transformer coil to the ground, and the power source 7 is connected to the oil type. The shorting coil 10 in the transformer 4 provides a power source. When the first discharge frequency domain sensing device 6 senses the abnormal discharge signal, it indicates that the oil transformer casing and the core 9 are abnormally discharged to the ground, and when the second discharge frequency domain sensing device 5 senses abnormal discharge In the case of a signal, it indicates that the above-mentioned oil-type transformer coil is abnormally discharged to the ground. In this way, the oil-type transformer on-line discharge diagnostic monitoring device of the present invention can determine whether the oil-type transformer 4 is operating normally and find out the abnormal discharge signal and the abnormal discharge component of the oil-type transformer 4, for example. For example, when the first discharge frequency domain sensing device 6 senses the abnormal discharge signal and the second discharge frequency domain sensing device 5 does not sense the abnormal discharge signal, it can be judged that the main insulation withstand voltage is insufficient, and vice versa. When the two discharge frequency domain sensing device 5 senses the abnormal discharge signal and the first discharge frequency domain sensing device 6 does not sense the abnormal discharge signal, it can be judged as the lead wire or the insulation withstand voltage insufficient to the ground except the main insulation.

The above-mentioned embodiments are merely examples for convenience of description, and the scope of the claims is intended to be limited to the above embodiments.

1‧‧‧ sensor

2‧‧‧ Receiver

3‧‧‧Signal strength indicator

11‧‧‧Monopole antenna

12‧‧‧ loop antenna

Claims (10)

A discharge frequency domain sensing device includes: a sensor for sensing an abnormal discharge signal; a receiver connected to the sensor to receive the abnormal discharge signal; and a signal strength indicator connected to the receiver The device displays the abnormal discharge signal; wherein the sensor comprises two monopole antennas and a loop antenna, and the two monopole antennas are connected to the first end of the loop antenna, and the two monopole antennas are connected The second end is vacant, and the first end and the second end of the root loop antenna are connected to the receiver. The sensing device of claim 1, wherein the sensor is an ultra high frequency sensor. The sensing device of claim 1, wherein the sensing frequency of the sensor ranges from 10 MHz to 1 GHz. The sensing device of claim 1, wherein the abnormal discharge signal sent by the receiver to the signal strength indicator is an analog signal. The sensing device of claim 1, wherein the signal strength indicator is an oscilloscope. The sensing device of claim 1, wherein the sensor has a reflection loss of -35 dB. The sensing device of claim 1, wherein the sensitivity of the sensor is -85 dBm. The sensing device of claim 1, wherein the monopole antenna or the loop antenna is formed by winding an iron core with an enameled wire. An oil-type transformer on-line discharge diagnostic monitoring device comprises: a first discharge frequency domain sensing device attached to a grounding wire of an oil-type transformer for sensing abnormal discharge of the oil-type transformer casing and the core to the ground; a second discharge frequency domain sensing device is attached to an extended grounding wire of the first short-circuit coil in the oil-type transformer for sensing abnormal discharge of the oil-type transformer coil to the ground; and a power source and a connection a second short-circuit coil in the oil-type transformer to provide a power supply; wherein the first and second discharge frequency-domain sensing devices respectively comprise: a sensor for sensing an abnormal discharge signal; and a receiver Connecting the sensor to receive the abnormal discharge signal; and a signal strength indicator connected to the receiver to display the abnormal discharge signal; wherein the sensor comprises two monopole antennas and a loop antenna, Two monopole antennas are connected to the first end of the loop antenna, and the second ends of the two monopole antennas are connected to each other. The first end and the second end of the loop antenna are connected to the receiver. The oil-type transformer line discharge diagnostic monitoring device according to claim 9, wherein the sensor is an ultra-high frequency sensor.