A device for detecting mechanical characteristics and electrical quantities of high-voltage disconnect switches

Abstract

The present invention presents a device for detecting the mechanical characteristics and electrical quantities of a high-voltage isolating switch. The high-voltage isolating switch includes a drive motor, including a power input terminal, a power output terminal and a frequency converter. The frequency converter is connected in series between the power output terminal and the power output terminal. The drive motor is connected to the power output terminal. A vibration switch is attached to the outer surface of the drive motor, and the vibration switch is connected to the frequency converter. A current-limiting inductor, a current timer, an watt-hour meter and a three-phase ammeter are connected in series between the frequency converter and the power output terminal. The three-phase ammeter is connected to a storage oscilloscope. This detection device makes it easier to detect hidden faults of the high-voltage isolating switch.

Description

Technical Field

[0001] The invention discloses a device for detecting the mechanical characteristics and electrical quantities of a high-voltage isolating switch, and belongs to the technical field of high-voltage isolating switch detection devices. Background Art

[0002] Disconnectors are a core component of power systems. However, due to their inherently complex mechanical structure, mechanical failures are more frequent. These failures, such as improper opening and closing, blade arm deformation, foundation settlement, blade head overheating and oxidation, and clamp slippage, cause disconnector opening and closing difficulties, as well as blade head overheating and burning. However, to date, testing of the mechanical properties of disconnectors remains at a very crude and primitive stage. Maintenance of disconnectors requires only a few visual inspections to ensure no sticking and that the DC resistance of the blades meets the required standards. If there is blade arm deformation, an incomplete blade position, or over-closing, these issues remain undetected, posing a significant risk to future safe operation. Therefore, existing disconnector maintenance and testing standards are significantly inadequate. Mechanical anomalies in disconnectors are sometimes not detected promptly and effectively. With technological advancements and increasing demands for condition-based maintenance, there is an urgent need for a technical means to conveniently and effectively test the mechanical properties of disconnectors, the most important component of primary equipment. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a device for detecting electrical quantities of mechanical characteristics of a high-voltage disconnector, which can more easily detect hidden faults of the high-voltage disconnector.

[0004] To solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A device for detecting electrical quantities of mechanical characteristics of a high-voltage isolating switch, the high-voltage isolating switch including a drive motor, including a power input terminal, a power output terminal and a frequency converter, the frequency converter being connected in series between the power input terminal and the power output terminal, the power input terminal being connected to a unit input end of the frequency converter, the drive motor being connected to the power output terminal, a vibration switch being attached to the outer surface of the drive motor, the vibration switch being connected to the frequency converter, a current-limiting inductor, a current timer, an watt-hour meter and a three-phase ammeter being connected in series between the frequency converter and the power output terminal, the three-phase ammeter being connected to a storage oscilloscope.

[0006] The beneficial effects of the present invention are:

[0007] The detection device described in the present invention includes a power input terminal, a power output terminal and a frequency converter. A current-limiting inductor, a current timer, an electric meter and a three-phase ammeter are connected in series between the frequency converter and the power output terminal. The drive motor is connected to the power output terminal. A vibration switch is attached to the surface of the drive motor. The present invention reflects whether there are hidden dangers such as mechanical jamming, oil shortage, travel switch offset, structural looseness, and tight or loose blades during the operation of the isolating switch by testing the electrical quantities of the speed, torque, operating work and operating time of the drive motor during the entire opening and closing operation of the isolating switch. In addition, the frequency converter is used to adjust the speed of the drive motor and cooperate with the feedback signal of the vibration switch. Since the frequency converter has a configurable motor starting characteristic curve setting, it can directly simulate the actual load change of the drive motor and adjust the torque of the drive motor to the limit torque that the drive motor can operate, so that the mechanical hidden dangers of the isolating switch can be more sensitively discovered, and its operation process is simple and easy to operate.

[0008] In addition, there are a large number of frequency converters, current timers, watt-hour meters and three-phase ammeters that are nearing the end of their service life in the power system, and there are also many current-limiting reactors that have been eliminated by traditional speed control systems. The frequency converters, current-limiting reactors, current timers, watt-hour meters and three-phase ammeters described in the present invention can use the above-mentioned equipment that is nearing the end of its service life or has been eliminated, so as to realize the current regulation and measurement functions required for the detection of the characteristics of the isolating switch. The present invention can make use of idle or eliminated cheap equipment, and realize the detection of the healthy operation of the isolating switch at an extremely low cost. It uses simple means to cover most of the detection items of the isolating switch, avoids the hidden dangers of the isolating switch running with a disease, and makes full use of scrapped and idle equipment, achieving the outstanding effect of recycling resources and turning waste into treasure.

[0009] Preferably, the frequency converter is provided with a voltage rise / fall control terminal, and the vibration switch is connected to the voltage rise / fall control terminal of the frequency converter.

[0010] Preferably, the current timer is provided with an induction coil, and the frequency converter is connected in series with the induction coil.

[0011] Preferably, the electricity meter is provided with a current coil, and the frequency converter is connected in series with the current coil.

[0012] As an advantage, the vibration acceleration of the vibration switch is 0.9-2 The action response time of the vibration switch is less than 20 milliseconds.

[0013] Preferably, the voltage rise and fall rate of the inverter is 50V / s.

[0014] Other features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below with reference to the accompanying drawings:

[0016] Figure 1 Schematic diagram of an embodiment of the present invention.

[0017] Reference numerals: 1 frequency converter, 2 current limiting reactor, 3 current timer, 4 watt-hour meter, 5 vibration switch, 6 three-phase ammeter, 7 power input terminal, 8 power output terminal, 9 storage oscilloscope. DETAILED DESCRIPTION

[0018] The following is an explanation and description of the technical solutions of the embodiments of the present invention in conjunction with the drawings of the embodiments of the present invention. However, the following embodiments are only preferred embodiments of the present invention and are not exhaustive. Based on the embodiments in the implementation manner, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0019] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referenced. Thus, features identified with "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "plurality" means two or more, unless expressly limited otherwise.

[0021] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances. Example

[0022] like Figure 1As shown, this embodiment shows a device for detecting the mechanical characteristics and electrical quantities of a high-voltage isolating switch, wherein the high-voltage isolating switch includes a drive motor, including a power input terminal 7, a power output terminal 8 and a frequency converter 1, wherein the frequency converter 1 is connected in series between the power input terminal 7 and the power output terminal 8, wherein the power input terminal 7 is connected to the unit input terminal of the frequency converter 1, and the drive motor is connected to the power output terminal 8. A vibration switch 5 is attached to the outer surface of the drive motor, and the vibration switch 5 is connected to the frequency converter 1. In this embodiment, the frequency converter 1 is provided with a voltage rise and fall control terminal, and the vibration switch 5 is connected to the voltage rise and fall control terminal of the frequency converter 1. The power output terminal of the frequency converter 1 is connected to the power output terminal 8, and a current limiting reactor 2, a current timer 3, an electric meter 4 and a three-phase ammeter 6 are connected in series, wherein the current timer 3 is provided with an induction coil, the frequency converter 1 is connected in series with the induction coil, the electric meter 4 is provided with a current coil, the frequency converter 1 is connected in series with the current coil, the three-phase ammeter 6 is connected with a storage oscilloscope 9, the three-phase ammeter 6 is provided with an analog signal transmitter terminal, the signal input terminal of the storage oscilloscope 9 is connected to the analog signal transmitter terminal of the three-phase ammeter 6, and the vibration acceleration of the vibration switch 5 in this embodiment is 0.9-2 The action response time of the vibration switch 5 is less than 20 milliseconds, and the voltage rise and fall rate of the inverter 1 is 50V / s.

[0023] Because the mechanical structure of the disconnector is complex and its stress conditions are difficult to analyze and test using conventional testing methods, this embodiment uses electrical measurements of the drive motor's speed, torque, operating power, and operating time throughout the disconnector's opening and closing operations to identify potential hazards such as mechanical jamming, oil shortage, travel switch offset, structural looseness, or loose or tightened blades. Furthermore, the drive motor's speed is regulated by the frequency converter 1, which, in conjunction with the feedback signal from the vibration switch 5, provides a configurable motor starting characteristic curve. When the frequency converter 1 increases the voltage at a certain slope until the drive motor rotates, the vibration switch senses the motor's vibration acceleration and activates. The frequency converter 1 reduces the output voltage until the motor stops. After the vibration switch activates, the frequency converter 1 increases the voltage again. The resulting negative feedback causes the drive motor to operate at the minimum torque required to overcome the disconnector's operational resistance, thus adjusting the drive motor's torque to its maximum operating torque. This significantly reduces operating speed, facilitating identification of potential hazards and maximizing the potential hazards of the disconnector's drive mechanism.

[0024] Regarding the hidden dangers of the isolating switch, if a higher output voltage is required for the motor to rotate, it means that the mechanical parts of the isolating switch are stuck as a whole or lack oil lubrication; if the starting current is too large or there is still a large current after the operation is terminated, it means that the travel switch contacts are offset; if the current is large when the isolating switch blade is opened or closed, it means that the blade is too tight or loose. These indicators can be sensitively detected through the real-time current detection of the ammeter and the recording of the current change curve by the storage oscilloscope 9. In addition, the entire operation time and the electric energy consumed during the operation can also be recorded through the electricity meter 4 and the current timer 3. Fast operation and short time represent a good mechanical state without jamming. This embodiment adjusts the motor driving torque to the maximum torque that the motor can operate, combines the auxiliary measurement of motor energy consumption and time consumption, and uses electrical quantity means to sensitively detect whether the isolating switch has mechanical hidden dangers.

[0025] In addition, there are a large number of frequency converters 1, current timers 3, watt-hour meters 4 and three-phase ammeters 6 that are nearing the end of their service life in the power system, and there are also many current-limiting reactors 2 that have been eliminated by traditional speed control systems. The frequency converter 1, current-limiting reactor 2, current timer 3, watt-hour meter 4 and three-phase ammeter 6 described in the present invention can use the above-mentioned equipment that is nearing the end of its service life or has been eliminated, so as to realize the current regulation and measurement functions required for the detection of the characteristics of the isolating switch. The present invention can utilize idle or eliminated cheap equipment, and realize the detection of the healthy operation of the isolating switch at an extremely low cost. It uses simple means to cover most of the detection items of the isolating switch, avoids the hidden dangers of the isolating switch running with a disease, and makes full use of scrapped and idle equipment, achieving the outstanding effect of recycling resources and turning waste into treasure.

[0026] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art will understand that the present invention includes, but is not limited to, the contents described in the drawings and the above specific embodiments. Any modifications that do not deviate from the functional and structural principles of the present invention are intended to be included within the scope of the claims.

Claims

1. A device for detecting mechanical characteristics and electrical quantities of a high-voltage disconnect switch, the high-voltage disconnect switch including a drive motor, characterized in that: It includes a power input terminal, a power output terminal and a frequency converter, the frequency converter is connected in series between the power input terminal and the power output terminal, the power input terminal is connected to the unit input terminal of the frequency converter, the drive motor is connected to the power output terminal, a vibration switch is attached to the outer surface of the drive motor, the vibration switch is connected to the frequency converter, a current limiting inductor, a current timer, an electric meter and a three-phase ammeter are connected in series between the frequency converter and the power output terminal, the three-phase ammeter is connected to a storage oscilloscope, the frequency converter is provided with a voltage rise and fall control terminal, and the vibration switch is connected to the voltage rise and fall control terminal of the frequency converter.

2. A high-voltage disconnect switch mechanical characteristic electrical quantity detection device according to claim 1, characterized in that: The current timer is provided with an induction coil, and the frequency converter is connected in series with the induction coil.

3. The device for detecting mechanical characteristics and electrical quantities of a high-voltage disconnect switch according to claim 1, wherein: The electric meter is provided with a current coil, and the frequency converter is connected in series with the current coil.

4. The device for detecting mechanical characteristics and electrical quantities of a high-voltage disconnect switch according to claim 1, wherein: The vibration acceleration of the vibration switch is 0.9-2 The action response time of the vibration switch is less than 20 milliseconds.

5. The device for detecting mechanical characteristics and electrical quantities of a high-voltage disconnect switch according to claim 1, characterized in that: The voltage rise and fall rate of the frequency converter is 50V / s.

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