ULTRA-HIGH FREQUENCY PARTIAL DISCHARGE ARRAY SENSOR APPARATUS FOR HIGH-VOLTAGE POWER APPARATUS

• US 20100123464A1
• Filed: 09/25/2009
• Published: 05/20/2010
• Est. Priority Date: 11/14/2008
• Status: Active Grant

• Current Assignee: Korea Electric Power Corporation (Government of South Korea)
• Original Assignee: Korea Electric Power Corporation (Government of South Korea)
• Inventors: HAN, Ki-Seon, GOO, Sun-Geun, JU, Hyung-Jun, YOON, Jin-Yul, PARK, Ki-Jun
• Granted Patent: US 8,294,471 B2
• Time in Patent Office: Days
• US Class Current: 324/500
• CPC Class Codes: G01R 29/0878 Sensors; antennas; probes; detectors wave guide measuring sections G01R1/24
• CPC Class Codes: G01R 31/1227 of components, parts or materials G01R31/1209, G01R31/1218, G01R31/18 take precedence; circuits therefor G01R31/14; testing vessels of electrodes G01R31/16

Abstract

The ultra-high frequency partial discharge array sensor apparatus for a high-voltage power apparatus includes: a sensing unit which detects an electromagnetic wave partial discharge signal generated due to an internal defect of a high-voltage power apparatus and includes a plurality of sensors installed to detect information related to the position where the defect occurs; an anti-surge filter unit which prevents a surge input from the sensing unit; a signal delay time adjusting unit which equally adjusts delay times of signals input from the anti-surge filter unit; a signal switching unit which selectively transmits or blocks signals input from the signal delay time adjusting unit; a connector unit which connects a signal transmitted from the signal switching unit to the outside; and a sensor body which has a receiving space.

Claims

1. An ultra-high frequency partial discharge array sensor apparatus for a high-voltage power apparatus, comprising:

a sensing unit which detects an electromagnetic wave partial discharge signal generated due to an internal defect of a high-voltage power apparatus and includes a plurality of sensors installed to detect information related to the position where the defect occurs;

an anti-surge filter unit which prevents a surge input from the sensing unit;

a signal delay time adjusting unit which equally adjusts delay times of signals input from the anti-surge filter unit;

a signal switching unit which selectively transmits or blocks signals input from the signal delay time adjusting unit;

a connector unit which connects a signal transmitted from the signal switching unit to the outside; and

a sensor body which has a receiving space.

2. The ultra-high frequency partial discharge array sensor apparatus of claim 1, wherein the sensing unit comprises a high sensitivity sensor disposed at a center thereof and a plurality of array sensors for position estimation disposed at regular intervals around the high sensitivity sensor.

3. The ultra-high frequency partial discharge array sensor apparatus of claim 2, wherein the anti-surge filter unit comprises:

a high sensitivity anti-surge filter connected to the high sensitivity sensor and a plurality of array anti-surge filters connected to the array sensors, respectively.

4. The ultra-high frequency partial discharge array sensor apparatus of claim 1, wherein the signal delay time adjusting unit is configured with electric wires, signal lines, or signal lines of a circuit substrate and adjusts the length of signal lines connected from the sensing unit to the signal switching unit to make the times taken for signals detected by the respective sensors of the sensing unit to reach the connector unit equal to each other.

5. The ultra-high frequency partial discharge array sensor apparatus of claim 1, wherein the signal delay time adjusting unit is configured with electric wires, signal lines, or signal lines of a circuit substrate and changes the material of the signal lines to change the transmission rate of the signal.

6. The ultra-high frequency partial discharge array sensor apparatus of claim 1, wherein the signal switching unit is configured with a switching element including a semiconductor switch or a mechanical latch relay switch and relays signals detected by the sensing unit to the connector unit or switches signals of the array sensors around the high sensitivity sensor to the output to a high sensitivity connector of the connector unit together with a central sensor signal, thus increasing sensitivity

7. The ultra-high frequency partial discharge array sensor apparatus of claim 1, wherein the connector unit has a hermetically sealed structure in which a high sensitivity connector, an array sensor connector, and a signal switch connector which receives a switching command from the signal switching unit are installed outside the sensor body.

8. The ultra-high frequency partial discharge array sensor apparatus of claim 1, wherein the sensor body has a structure in which a dielectric material for fixing sensors is filled therein, the connector unit is installed on the outside thereof, and a flange having bolt holes through which the sensor body is attached to a housing of the power apparatus is formed.