KR20240059315A - Sf6 gas density sensor-embeded indicator module - Google Patents

Abstract

The present invention is based on the vibrating quartz principle and provides an SF6 gas density sensor 110 that detects changes in the density of SF6 within the chamber space of the power device 10 for power transmission to each receiving location, and a real-time density value and change amount. The wires electrically connected to the touch screen display panel 121 that displays the operating status and the connector 118 of the SF6 gas density sensor 110 are introduced from the bottom, and each wire is electrically connected to an exposed metal slip. A fixture 122 formed by stacking rings 126, one side individually electrically contacting the metal slip ring 126, and the other side integrated and fixed to an insulator, a slip ring brush 123, and individual slip ring brushes It consists of a wire 124 electrically connected from (123) to the display panel 121, and a rotating plate 125 coupled to rotate around the upper and lower bearings formed on both ends of the central axis of the fixture 122. , the display panel 121 is spaced apart from the side of the fixture 122 and is fixed to the rotating plate 125, so that the display panel 121 includes an indicator 120 that is coupled to rotate left and right within a range of 330°, SF6 Disclosed is an indicator module with a built-in SF6 gas density sensor in which the gas density sensor 110 and the indicator 120 are each modularized and can be easily replaced by being combined or separated.

Description

SF6 gas density sensor built-in indicator module {SF6 GAS DENSITY SENSOR-EMBEDED INDICATOR MODULE}

The present invention is an indicator module with a built-in SF6 gas density sensor in which the SF6 gas density sensor and indicator are each modularized and can be combined or separated to facilitate individual replacement in case of malfunction or failure of any one, thereby reducing maintenance costs. It's about.

In general, it is very important to detect abnormalities in power equipment, monitor the degree of deterioration of insulators, and predict repair times, and such prediction and management are possible by measuring and monitoring partial discharge.

For this purpose, various power facilities such as high-voltage cables, transformers, GIS (Gas Insulated Switchgear), switches, power reception facilities, high-voltage panels, low-voltage panels, motor control panels, distribution boards, etc., are used in various power equipment systems. Discharge measurement devices are being used.

Related prior art calculates the density value using a mixed density measurement method that measures three variables: dew point, temperature, and pressure, but there is a problem in that errors in calculated values occur due to various variables.

Meanwhile, the insulation performance is maintained by filling the inside of the power device with SF6. SF6 gas is non-toxic, non-flammable, and has good insulation properties, and the breakdown voltage of SF6 gas is proportional to gas pressure or density.

Accordingly, technology is required that can accurately measure the change in density of SF6 in the space inside the power equipment chamber and reduce maintenance costs of replacing all sensor-related equipment in the event of frequent malfunctions or failures in harsh environments. do.

Korean Patent Publication No. 10-1882715 (29KV GIS remote diagnosis system equipped with partial discharge and gas density diagnosis device, 2018.08.27) Korean Patent Publication No. 10-0220770 (Gas detection sensor and manufacturing method thereof, 1999.09.15) Korean Patent Publication No. 10-2198520 (Gas sensor module for diagnosing gas insulation devices, 2021.01.05)

The technical problem to be achieved by the idea of the present invention is that the F6 gas density sensor and indicator are modularized and can be combined or separated to facilitate individual replacement in case of malfunction or failure, thereby reducing maintenance costs. , to provide an indicator module with a built-in SF6 gas density sensor.

In order to achieve the above-described object, an embodiment of the present invention is introduced into the chamber interior space of a power device for power transmission to each receiving location and is formed at the front end of the main body and the chamber interior space of the power device. A first quartz oscillator that oscillates a different first resonance frequency according to the change in density of SF6, an insulation barrier filled in the oscillator, and a second oscillator that is formed in the sealed vacuum space of the main body and oscillates a second resonance frequency in a vacuum state. A quartz oscillator, a mixer that receives the first and second resonance frequencies and outputs a difference value, a pulse generation module that generates a pulse frequency proportional to the difference value, and a voltage corresponding to the pulse frequency. An SF6 gas density sensor based on the vibrating quartz principle, which consists of a voltage conversion module that converts the voltage into a current corresponding to the voltage, and a connector that provides a current signal from the current conversion module to the outside; And a display panel that displays the real-time density value, change amount, and operating status, and a wiring electrically connected to the connector of the SF6 gas density sensor is introduced from the bottom, and each individual wiring is electrically connected and exposed metal slip rings are laminated. A fixture, a slip ring brush on one side of which is individually in electrical contact with the metal slip ring and the other side integrated and fixed to an insulator, a wire electrically connected from the individual slip ring brush to the display panel, and the fixture It consists of a rotating plate coupled to rotate around the upper and lower bearings formed at both ends of the central axis, and the display panel is spaced apart from the side of the fixture and fixed to the rotating plate to rotate left and right within a 330° range. , an indicator; and, wherein the SF6 gas density sensor and the indicator are modularized and combined or separated, providing an indicator module with a built-in SF6 gas density sensor.

Here, the display panel may be formed to be inclined in a diagonal direction.

Additionally, the metal slip ring is formed separately into 2 to 12 wires, and the contact terminal of the slip ring brush may be formed of graphite, gold-plated, or silver-plated.

Additionally, the indicator may have a self-calibration function.

Additionally, the indicator can generate and propagate a warning signal when a density value below a preset reference value is measured by the SF6 gas density sensor.

According to the present invention, the SF6 gas density sensor and indicator are each modularized and can be combined or separated to facilitate individual replacement in case of malfunction or failure, thereby reducing maintenance costs, and the indicator has a 330° range. It can be combined to rotate left and right within the device, so in cases where the viewing angle during inspection is limited due to the surrounding structures of the power equipment, it is possible to easily identify it by rotating only the indicator.

Figure 1 shows a configuration diagram of an indicator module with a built-in SF6 gas density sensor according to an embodiment of the present invention.
Figure 2 illustrates an implementation diagram of the indicator module with built-in SF6 gas density sensor of Figure 1.
Figure 3 illustrates a graph of current according to the difference in resonance frequency by the SF6 gas density sensor of Figure 1.
Figure 4 illustrates the internal structure of the indicator of Figure 2.
Figure 5 illustrates the application of the indicator module with a built-in SF6 gas density sensor of Figure 2.

Hereinafter, embodiments of the present invention having the above-described features will be described in more detail with reference to the attached drawings.

The indicator module with a built-in SF6 gas density sensor according to an embodiment of the present invention is based on the principle of vibrating quartz, and detects the change in density of SF6 in the inner space of the chamber of the power device 10 for power transmission to each receiving location. The wiring electrically connected to the gas density sensor 110, the touch screen display panel 121 that displays the real-time density value, change amount, and operating status, and the connector 118 of the SF6 gas density sensor 110 is connected from the bottom. A fixture 122 formed by stacking exposed metal slip rings 126 that are introduced and electrically connected to each individual connection, and one side is individually electrically contacted with the metal slip ring 126 and the other side is integrated and fixed to the insulator. the slip ring brush 123, the wire 124 electrically connected from the individual slip ring brush 123 to the display panel 121, and the upper and lower bearings formed on both ends of the central axis of the fixture 122. It consists of a rotating plate 125 coupled to rotate on an axis, and the display panel 121 is spaced apart from the side of the fixture 122 and fixed to the rotating plate 125, so that the display panel 121 can rotate left and right within a 330° range. The SF6 gas density sensor 110 and the indicator 120 are each modularized so that they can be easily replaced by being combined or separated.

Hereinafter, with reference to FIGS. 1 to 5, the SF6 gas density sensor built-in indicator module of the above-described configuration will be described in detail as follows.

The SF6 gas density sensor 110 is a component that detects the density of the inner space of the chamber of the power device 10 based on the principle of vibrating quartz, and is located in the inner space of the chamber of the power device 10 for power transmission to each receiving location. The first quartz is introduced into the main body 111 and formed at the front end of the main body 111 and oscillates at a different first resonance frequency according to the change in density of SF6, an insulation barrier agent, filled in the inner space of the chamber of the power device 10. The oscillator 112 and the second quartz oscillator 113 are formed in the sealed vacuum space of the main body 111 and oscillate at a second resonance frequency in a vacuum state, and each oscillate at a first resonance frequency and a second resonance frequency. A mixer 114 that receives and outputs the difference value, a pulse generation module 115 that generates a pulse frequency proportional to the difference value, a voltage conversion module 116 that converts the pulse frequency into a voltage corresponding to the voltage, and It consists of a current conversion module 117 that converts the current into a corresponding current, and a connector 118 that provides the current signal from the current conversion module 117 to the outside.

Specifically, as illustrated in FIG. 2, the main body 111 is bolted to the inner space of the chamber of the power device 10 for power transmission to each receiving location in an airtight manner using a silicon O-ring 111a or the like at the front end. The front end can be covered with an insulating material that is resistant to corrosion and deterioration due to partial discharge and SF6 gas in the inner space of the chamber.

Here, the power equipment 10 may be a gas insulated switchgear (GIS) of a gas insulated substation in the power system, a gas circuit breaker, a power receiving facility, a high-voltage distribution board, a high-voltage cable, a transformer, etc.

Meanwhile, SF6 gas is non-toxic, non-flammable, and has good insulation properties, and the breakdown voltage of SF6 gas has the characteristic of being proportional to gas pressure or density. That is, the breakdown voltage of SF6 gas increases in proportion to the gas pressure, so the breakdown voltage of SF6 gas increases in proportion to the gas pressure. Insulation strength is determined by pressure.

In addition, SF6 gas is an extremely stable gas at room temperature, but decomposition occurs due to partial discharge (arc). When SF6 gas is decomposed, it is recombined after extinguishing and returned to its original state, but during the recombination process, some of the SF6 gas reacts with moisture and is lost, resulting in a decrease in insulation performance.

Next, the first quartz oscillator 112 is formed at the front end of the main body 111 so that a portion is exposed to the inner space of the chamber of the power device 10, resulting in leakage or decomposition of SF6, an insulation barrier filled in the inner space of the chamber. Different first resonance frequencies distinguished according to density changes are oscillated and transmitted to the mixer 114.

Next, the second quartz oscillator 113 is separated from the inner space of the chamber of the power device 10 and is formed in the sealed vacuum space of the main body 111, and has a second resonance frequency in a vacuum state where SF6 gas does not exist. It oscillates and transmits it to the mixer 114.

In addition, the first quartz oscillator 112 and the second quartz oscillator 113 mentioned above include a crystal oscillator that vibrates differently depending on the density change of the SF6 gas, and an oscillator that converts the vibration of the crystal oscillator into a resonance frequency. Each can be included.

Next, the mixer 140 receives the first resonance frequency from the first quartz oscillator 112 and the second resonance frequency from the second quartz oscillator 113, and outputs the resonance frequency difference value to generate a pulse. Transmit to module 115.

For example, the mixer 114 detects the edges of signals of the first and second resonant frequencies using an insulating element and a condenser, and sets a counter so that the duty is constant based on the detected edges and the additional oscillator circuit of 135.6 kHz. You can create it and output the difference value.

Next, the pulse generation module 115 generates a pulse frequency proportional to the resonance frequency difference value transmitted from the mixer 114 and transmits it to the voltage conversion module 116.

Next, the voltage conversion module 116 includes a frequency-voltage converter, converts the pulse frequency transmitted from the voltage conversion module 116 into a voltage corresponding to the voltage, and transmits it to the current conversion module 117. do.

Next, the current conversion module 117 proportionally converts the voltage transmitted from the voltage conversion module 116 into a current of a magnitude corresponding to the magnitude, and converts the change in density of SF6 gas into a current signal as illustrated in FIG. 3. Finally, it can be converted to measure the density of SF6 gas.

Here, the density range is 0 to 56.1 [SF6/m ₃ ], the frequency range is 10 to 275 Hz, the current range is 6.5 sol 20mA, and the density output form may be a current loop.

Next, referring to FIGS. 1 and 2, the connector 118 provides a current signal from the current conversion module 117 to the outside so that the density and density change of SF6 gas can be monitored in real time.

Meanwhile, frequency interference and noise generated by the power device 10 can be removed through a filter (not shown), thereby preventing distortion during pulse generation, voltage conversion, and current conversion, thereby increasing the accuracy of density measurement. .

Accordingly, by constructing the SF6 gas density sensor based on the vibrating quartz principle, it is possible to accurately measure the change in density of SF6 in the inner space of the power equipment chamber through the change in the resonance frequency of the quartz oscillator, and to detect gas leakage from the pressure vessel. can be detected to check confidentiality.

Referring to FIGS. 2 and 4, the indicator 120 is electrically connected to a display panel 121 that displays sensor data of real-time density values, changes, and operating states, and a connector 118 of the SF6 gas density sensor 110. A fixture 122 formed by stacking exposed metal slip rings 126 with wires connected to it coming in from the bottom and electrically connected to each individual wire, one side individually electrically contacting the metal slip ring 126, and the other side electrically contacting the metal slip ring 126. The side is integrated with the slip ring brush 123 fixed to the insulator 127, the wire 124 electrically connected from the individual slip ring brush 123 to the display panel 121, and the central axis of the fixture 122. It consists of a rotating plate 125 coupled to rotate around the upper and lower bearings formed at both ends, and the display panel 121 is spaced apart from the side of the fixture 122 and is fixed to the rotating plate 125 to display the display panel 121. ) is combined to rotate left and right within a 330° range, allowing the user to easily identify the real-time density value and change amount of the SF6 gas and the operating status of the SF6 gas density sensor 110 and indicator 120 itself.

For example, the display panel 121 is inclined in a diagonal direction and rotates left and right within a range of 330°, so that when the viewing viewpoint during inspection is limited due to surrounding structures of the power device 10, only the display panel 121 is used. It can be rotated for easy identification.

In addition, the metal slip ring 126 is formed separately into 2 to 12 lines, and the slip ring brush 123 is elastically bent and in close contact with the metal slip ring 126, and is directly connected to the metal slip ring 126. The contact terminal 123a of the contact slip ring brush 123 may be formed of graphite or may be gold-plated or silver-plated to ensure good electrical conductivity.

Meanwhile, as mentioned above, the indicator 120 can be rotated manually, but if manual rotation is performed in an environment where manual rotation is not possible, a safety accident may occur due to carelessness in contact with the hand or arm, so the remote It can be configured to enable rotation. For example, although not shown, the indicator 120 includes a reduction gear stage fixed to the central axis of the fixture 122, an electric motor that provides driving force to the reduction gear stage, and It further includes a control module that controls the rotation of the electric motor and an RFID (Radio-Frequency Identification) reading module that identifies ID using frequency, and the control module has a built-in RFID tag that is read and identified by the RFID reading module. By tracking the terminal and rotating the electric motor, the display panel 121 can be directed toward the user terminal.

That is, when approaching within a certain distance to inspect the SF6 gas density sensor 110 or indicator 120 or identify sensor data of the indicator 120, the direction of the user terminal equipped with the RFID tag is identified and moved in that direction. By rotating the indicator 120, the SF6 gas density sensor 110 can be occupied or sensor data can be conveniently checked even without directly rotating the indicator 120.

Meanwhile, the indicator 120 is compatible with the SF6 gas density sensor 110 by applying a multiplex circuit of power and signals, and has a self-calibration function, so it can provide convenience and efficiency.

In addition, the indicator 120 generates and propagates a warning signal when a density value below a preset reference value in the space inside the chamber is measured by the SF6 gas density sensor 110, thereby detecting density changes due to leakage or decomposition of the SF6 gas. It is possible to deal with this and check the airtightness of the power device 10.

In addition, referring to (a) of FIG. 2, the connector 118 of the SF6 gas density sensor 110 can be inserted into the socket formed in the hole (h) formed on the lower side of the indicator 120 and electrically connected, In order to prevent the SF6 gas density sensor 110 from being separated from the indicator 120 due to vibration transmitted from the power device 10, the SF6 gas density sensor is connected through a male and female hook structure or through various types of clamps (middle devices). (110) can be fixed to the indicator 120, and a coupling ring (not shown) made of elastic material is formed on the inner peripheral surface of the hole (h), and a ring-shaped ring is formed on the outer peripheral surface of the main body 111 of the SF6 gas density sensor 110. A coupling groove (not shown) may be formed so that the SF6 gas density sensor 110 is mutually fixed by fastening the coupling ring and the coupling groove when the SF6 gas density sensor 110 is introduced into the hole (h).

Meanwhile, the indicator 120 communicates with the monitoring server 130 through a gateway and transmits sensor data to the monitoring server 130, and the monitoring server 130 monitors the density value and change in real time to manage optimal density status. It is possible to monitor the operating status of the SF6 gas density sensor 110 and the indicator 120 in real time for operating status or malfunctioning status, provide alarm information according to the warning signal transmitted from the indicator 120, and provide the corresponding Alarm information can also be sent to the person in charge's smart terminal so they can respond quickly.

In addition, the above-mentioned SF6 gas density sensor 110 is installed in multiple locations in the chamber interior space of the same power device 10, and the monitoring server 130 detects the SF6 gas density sensor 110 by a plurality of SF6 gas density sensors 110. Through each density value, the distribution state of SF6 gas in the internal space of the large-capacity chamber can be identified, and when the distribution level below the standard value is monitored, the corresponding alarm information can be disseminated to warn.

In addition, the monitoring server 130 is a deep network built by pre-learning the dataset of the density change amount of the SF6 gas, the density detection duration below the standard value, and the remaining life and malfunction and failure of the corresponding SF6 gas density sensor 110. Through a running-based diagnostic algorithm, the remaining life and replacement cycle of the SF6 gas density sensor 110 are predicted through sensor data transmitted in real time from the SF6 gas density sensor 110, and the SF6 gas density sensor 110 is used before malfunction or failure. ) can be replaced to enable continuous monitoring.

Therefore, by the configuration of the indicator module with a built-in SF6 gas density sensor as described above, the SF6 gas density sensor 110 and the indicator 120 are each modularized and configured to be combined or separated so that they can be individually replaced in case of malfunction or failure of any one. Maintenance costs can be reduced by making it easy to operate, and the indicator can be combined to rotate left and right within a 330° range, so in cases where the viewing point during inspection is limited due to the surrounding structures of the power equipment, only the indicator can be rotated. It can be easily identified.

The embodiments described in this specification and the configuration shown in the drawings are only one of the most preferred embodiments of the present invention and do not represent the entire technical idea of the present invention, so various equivalents may be substituted for them at the time of filing the present application. It should be understood that variations and variations may exist.

110: SF6 gas density sensor 111: main body
112: first quartz oscillator 113: second quartz oscillator
114: mixer 115: pulse generation module
116: voltage conversion module 117: current conversion module
118: connector 120: indicator
121: display panel 122: fixture
123: slip ring brush 124: wire
125: Rotating plate 126: Metal slip ring
127: insulator 130: monitoring server

Claims (5)

Different agents are introduced into the inner space of the chamber of the power device for power transmission to each receiving location and change in density of the main body and SF6, which is an insulation barrier agent formed at the front end of the main body and filled in the inner space of the chamber of the power device. 1 A first quartz oscillator that oscillates a resonance frequency, a second quartz oscillator formed in a sealed vacuum space of the main body and oscillates a second resonance frequency in a vacuum state, and the first resonance frequency and the second resonance. A mixer that receives frequencies and outputs a difference value, a pulse generation module that generates a pulse frequency proportional to the difference value, a voltage conversion module that converts the pulse frequency into a voltage corresponding to the voltage, and a current corresponding to the voltage. An SF6 gas density sensor based on the vibrating quartz principle, which consists of a current conversion module that converts the current signal to the outside, and a connector that provides the current signal from the current conversion module to the outside. and
It is formed by stacking a display panel that displays real-time density values, changes, and operating status, and wires electrically connected to the connector of the SF6 gas density sensor, which are electrically connected to each wire from the bottom and exposed metal slip rings. a static body, a slip ring brush on which one side is individually electrically contacted with the metal slip ring and the other side is integrated and fixed to an insulator, a wire electrically connected from the individual slip ring brush to the display panel, and the fixture of the fixture. It consists of a rotating plate coupled to rotate around the upper and lower bearings formed at both ends of the central axis, and the display panel is spaced apart from the side of the fixture and fixed to the rotating plate and coupled to rotate left and right within a 330° range. Including indicator;
The SF6 gas density sensor and the indicator are each modularized and combined or separated,
SF6 gas density sensor built-in indicator module.
According to paragraph 1,
The display panel is characterized in that it is formed inclined in a diagonal direction,
SF6 gas density sensor built-in indicator module.
According to paragraph 1,
The metal slip ring is formed separately into 2 to 12 wires,
The contact terminal of the slip ring brush is formed of graphite, or is formed by gold plating or silver plating.
SF6 gas density sensor built-in indicator module.
According to paragraph 1,
The indicator is characterized in that it has a self-calibration function,
SF6 gas density sensor built-in indicator module.
According to paragraph 1,
The indicator is characterized in that it generates and propagates a warning signal when a density value below a preset reference value is measured by the SF6 gas density sensor.
SF6 gas density sensor built-in indicator module.

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