Low-power transformer for gas-insulated switchgear having dual voltage sensor

Abstract

The present invention relates to a low-power transformer for a gas-insulated switchgear having a dual voltage sensor, which is capable of increasing the reliability of the gas-insulated switchgear by dualizing a voltage detector, which is a component of the low-power transformer, miniaturizing the gas-insulated switchgear by providing a shielding function between a plurality of voltage detectors, which are components of the low-power transformer, and increasing vibration resistance performance. The low-power transformer for a gas-insulated switchgear having a dual voltage sensor of the present invention comprises: a current sensor for detecting a current flowing through a conductor inside the gas-insulated switchgear; and a voltage sensor for detecting a voltage of the conductor inside the gas-insulated switchgear.

Description

Low-power transformer for gas-insulated switchgear equipped with redundant voltage sensors

[0001] The present invention relates to a low-power transformer for a gas-insulated switchgear equipped with a redundant voltage sensor, and more specifically, to a voltage detector within the gas-insulated switchgear. Furthermore, the present invention relates to a low-power transformer for a gas-insulated switchgear equipped with a redundant voltage sensor that enables the miniaturization of the gas-insulated switchgear by including a shielding function between a plurality of voltage detectors that are components of the low-power transformer.

[0002] Generally, a gas-insulated switchgear is a switching device that maintains insulation by housing busbars, switching devices, transformers, lightning arresters, etc., inside a metal container and filling and sealing it with SF6 gas, which has excellent insulation performance and arc extinguishing characteristics. In the event of serious abnormalities such as equipment failure, natural phenomena like lightning strikes, transmission line disconnection, leakage, or short circuits in the power grid, external substations, or power plants, it separates the power grid from the power plant to prevent damage to the equipment and the spread of ripple effects.

[0003] At this time, a sensor is required to detect the voltage applied to the conductors within the gas-insulated switchgear and the current flowing through them, and continuous efforts have been made to improve the iron-core transformer (CT / VT), an existing component of the gas-insulated switchgear.

[0004] For example, Korean Registered Patent No. 10-2681438 discloses a low-power transformer applicable to a digital substation, configured to include two current transformers (CT) and voltage transformers (VT) in the primary side output device, and configured to include an AD / DC circuit that performs digitization of an analog signal and a communication circuit in the secondary side output device.

[0005] However, there is a disadvantage in that the reliability is low because the current transformers and transformers of the gas-insulated switchgear are not redundant.

[0006] The objective of the present invention is to provide a low-power transformer for a gas-insulated switchgear equipped with a redundant voltage sensor that can increase the reliability of the gas-insulated switchgear by duplicating the voltage detector, which is a component of the low-power transformer.

[0007] Another objective of the present invention is to provide a low-power transformer for a gas-insulated switchgear equipped with a redundant voltage sensor that can miniaturize the gas-insulated switchgear by including a shielding function between a plurality of voltage detectors, which are components of the low-power transformer, while also enhancing vibration resistance performance.

[0008] A low-power transformer for a gas-insulated switchgear equipped with a redundant voltage sensor according to the present invention may include a current sensor for detecting a current flowing through a conductor inside the gas-insulated switchgear, and a voltage sensor for detecting a voltage of a conductor inside the gas-insulated switchgear.

[0009] Here, the current sensor and voltage sensor are connected to a converter so that the analog signal can be converted into digital.

[0010] In addition, the current sensor may be equipped with a conductor and a concentric coil.

[0011] Here, a Rogowski coil can be used as the current sensor.

[0012] In addition, the current sensor can perform a shielding function by being connected to the enclosure and ground near the enclosure.

[0013] Here, the current sensor may be configured with a redundancy structure by having a first current sensor and a second current sensor.

[0014] In addition, the voltage sensor is equipped with a conductor in a concentric cylindrical shape and can detect voltage based on capacitance.

[0015] Here, the voltage sensor may be configured with a redundancy structure by having a first voltage sensor and a second voltage sensor.

[0016] In addition, the first voltage sensor and the second voltage sensor may be provided with a barrier having a predetermined reference width and a height difference from the voltage sensor having a predetermined reference height between the first voltage sensor and the second voltage sensor to minimize interphase influence between the first voltage sensor and the second voltage sensor.

[0017] Here, the inter-phase influence can be maintained within 0.2%.

[0018] In addition, the standard width can have a value of 10 [mm] to 150 [mm].

[0019] Here, the reference height can have a value of 50 [mm] or less.

[0020] In addition, the barrier can increase the vibration resistance performance of the voltage sensor by at least four times.

[0021] The low-power transformer for a gas-insulated switchgear equipped with a redundant voltage sensor according to the present invention has the advantage of increasing the reliability of the gas-insulated switchgear by duplicating the voltage detector, which is a component of the low-power transformer.

[0022] In addition, the low-power transformer for a gas-insulated switchgear equipped with a redundant voltage sensor according to the present invention includes a shielding function between a plurality of voltage detectors that are components of the low-power transformer, thereby having the advantage of miniaturizing the gas-insulated switchgear while improving vibration resistance performance.

[0023] FIG. 1 is a cross-sectional view showing a low-power transformer for a gas-insulated switchgear equipped with a redundant voltage sensor according to one embodiment of the present invention.

[0024] FIG. 2 is a perspective view showing a gas-insulated switch including the current sensor and voltage sensor of FIG. 1.

[0025] Hereinafter, specific embodiments for carrying out the present invention will be described with reference to the attached drawings.

[0026] In describing the present invention, terms such as first, second, etc. may be used to describe various components, but the components may not be limited by the terms. The terms are intended solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component.

[0027] When it is described that a component is connected to or coupled with another component, it may be directly connected to or coupled with that other component, but it can also be understood that there may be other components in between.

[0028] The terms used in this specification are used merely to describe specific embodiments and are not intended to limit the invention. Singular expressions may include plural expressions unless the context clearly indicates otherwise.

[0029] In this specification, terms such as "comprising" or "having" are intended to indicate the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not excluding in advance the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0030] In addition, the shapes and sizes of elements in the drawings may be exaggerated for clearer explanation.

[0031] Hereinafter, a low-power transformer for a gas-insulated switchgear equipped with a redundant voltage sensor according to the present invention will be described in detail with reference to the attached drawings.

[0032]

[0033] FIG. 1 is a cross-sectional view showing a low-power transformer for a gas-insulated switchgear equipped with a redundant voltage sensor according to one embodiment of the present invention, and a perspective view showing a gas-insulated switchgear including the current sensor and voltage sensor of FIG. 1.

[0034] Hereinafter, a low-power transformer for a gas-insulated switchgear equipped with a redundant voltage sensor according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

[0035] First, referring to FIG. 1, a low-power transformer for a gas-insulated switchgear equipped with a redundant voltage sensor according to one embodiment of the present invention comprises a conductor (500) through which current flows inside the gas-insulated switchgear, a current sensor (100) for detecting the current flowing through the conductor (500), a voltage sensor (200) for detecting the voltage of the conductor (500) inside the gas-insulated switchgear, a converter (300) connected to the current sensor (100) and the voltage sensor (200) for converting an analog signal into a digital signal, and an enclosure (400) of the gas-insulated switchgear.

[0036] At this time, the current sensor (100) is provided with a concentric coil with the conductor (500) using a Rogowski coil. In addition, the current sensor (100) performs a shielding function by being connected to ground with the enclosure (400) around the enclosure (400), and is configured with a redundant structure by providing a first current sensor (110) and a second current sensor (120).

[0037] Typically, Low Power Instruments Transformers (LPITs) required for digital substations are configured with redundancy to improve product reliability. Accordingly, the voltage sensor (200) must form a uniform electric field between the conductor and the sensor to ensure accurate output without mutual influence, based on the principle of measuring voltage using stray capacitance. Furthermore, even if a failure occurs in one of the redundant voltage sensors, it must not affect the uniform electric field of the other voltage sensor.

[0038] The low-power transformer for a gas-insulated switchgear equipped with a redundant voltage sensor according to the present invention can reduce its size by having a Rogowski coil on the outer edge simultaneously perform current measurement and shielding functions for the uniform electric field of the voltage sensor (200).

[0039] Meanwhile, in the present invention, the voltage sensor (200) is provided in a concentric cylindrical shape with the conductor (500) to detect voltage based on capacitance, and is configured with a redundant structure by providing a first voltage sensor (210) and a second voltage sensor (220).

[0040] In addition, a barrier (600) is installed between the first voltage sensor (210) and the second voltage sensor (220) to minimize mutual influence between the first voltage sensor (210) and the second voltage sensor (220).

[0041] That is, in order to minimize the inter-phase influence between the first voltage sensor (210) and the second voltage sensor (220), a barrier (600) is provided between the first voltage sensor (210) and the second voltage sensor (220), with a predetermined reference width (W600) and a height difference from the voltage sensor (200) being a predetermined reference height (H600).

[0042] For example, in the present invention, the reference width (W600) may have a value of 10 mm to 150 mm and the reference height (H600) may have a value of 50 mm or less so that the inter-phase influence is maintained within 0.2%.

[0043] Here, a multi-degree equation with the reference width (W600) as a variable can be used to calculate the inter-phase effect on the reference width (W600) of the barrier, and a multi-degree equation with the reference height (H600) as a variable can also be used to calculate the inter-phase effect on the reference height (H600) of the barrier.

[0044] The low-power transformer for a gas-insulated switchgear equipped with a redundant voltage sensor according to the present invention has a uniform electric field configuration for stabilizing the output characteristics of the voltage sensor (200), and the size can be minimized by having a current sensor (100) composed of a Rogowski coil near the enclosure (400) perform both current measurement and shielding functions, and the size can be further reduced by having a barrier (600) between the first voltage sensor (210) and the second voltage sensor (220).

[0045] Meanwhile, the low-power transformer for a gas-insulated switchgear equipped with a redundant voltage sensor according to the present invention has the advantage of increased vibration resistance performance by providing a barrier (600) between the first voltage sensor (210) and the second voltage sensor (220).

[0046] That is, when there is no barrier (600), the voltage sensor (200) is fixed only on both sides of the enclosure (400), but in the present invention, by installing the barrier (600), the voltage sensor (200) can be supported even at the barrier located between the first voltage sensor (210) and the second voltage sensor (220), so that the vibrating length is reduced by half.

[0047] In terms of vibration resistance, since vibration resistance is inversely proportional to the square of the distance, the present invention can increase the vibration resistance performance of the voltage sensor (200) by at least four times compared to the case where there is no barrier (600) by providing a barrier (600).

[0048]

[0049] FIG. 2 is a perspective view showing a gas-insulated switch including the current sensor (100) and voltage sensor (200) of FIG. 1.

[0050] As can be seen in FIG. 2, the gas-insulated switch is composed of three conductors (500), and a current sensor (100) and a voltage sensor (200) per conductor (500) can be duplicated and configured inside the enclosure (400).

[0051] Meanwhile, a shield is required for each conductor (500) inside the enclosure (400), and the current sensor (100) according to the present invention performs the role of shielding as well as detecting current, thereby allowing the length of the gas-insulated switchgear to be reduced.

[0052] In addition, the low-power transformer for a gas-insulated switchgear equipped with a redundant voltage sensor according to the present invention has a uniform electric field configuration for stabilizing the output characteristics of the voltage sensor (200), and the size can be further reduced by providing a barrier (600) between the first voltage sensor (210) and the second voltage sensor (220).

[0053]

[0054] As described above, the low-power transformer for a gas-insulated switchgear equipped with a redundant voltage sensor according to the present invention can increase the reliability of the gas-insulated switchgear by duplicating the voltage detector, which is a component of the low-power transformer. Furthermore, by including a shielding function between multiple voltage detectors, which are components of the low-power transformer, the gas-insulated switchgear can be miniaturized while the vibration resistance performance can be improved.

[0055]

[0056] The description of the presented embodiments is provided so that any person skilled in the art may use or practice the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments without departing from the scope of the present invention. Thus, the present invention is not limited to the embodiments presented herein, but should be interpreted in the broadest possible scope consistent with the principles and novel features presented herein.

[0057] The present invention relates to a low-power transformer for a gas-insulated switchgear equipped with a redundant voltage sensor, and is applicable in the field of low-power transformers.

Claims

1. A current sensor for detecting current flowing through a conductor inside a gas-insulated switchgear; and A low-power transformer for a gas-insulated switchgear equipped with a redundant voltage sensor, comprising a voltage sensor for detecting the voltage of the conductor inside the gas-insulated switchgear.

2. In Paragraph 1, A low-power transformer for a gas-insulated switchgear equipped with a redundant voltage sensor, characterized in that the current sensor and the voltage sensor are connected to a converter so that the analog signal is converted into a digital signal.

3. In Paragraph 1, A low-power transformer for a gas-insulated switchgear equipped with a redundant voltage sensor, characterized in that the current sensor is provided with a coil concentric with the conductor.

4. In Paragraph 3, A low-power transformer for a gas-insulated switchgear equipped with a redundant voltage sensor, characterized in that the above current sensor uses a Rogowski coil.

5. In Paragraph 1, A low-power transformer for a gas-insulated switchgear equipped with a redundant voltage sensor, characterized in that the current sensor is connected to ground and the enclosure around the enclosure to perform a shielding function.

6. In Paragraph 1, A low-power transformer for a gas-insulated switchgear equipped with a redundant voltage sensor, characterized in that the above current sensor is formed into a redundant structure by having a first current sensor and a second current sensor.

7. In Paragraph 1, A low-power transformer for a gas-insulated switchgear equipped with a redundant voltage sensor, characterized in that the voltage sensor is provided in a concentric cylindrical shape with respect to the conductor and detects voltage based on capacitance.

8. In Paragraph 1, A low-power transformer for a gas-insulated switchgear equipped with a redundant voltage sensor, characterized in that the above voltage sensor is formed into a redundant structure by having a first voltage sensor and a second voltage sensor.

9. In Paragraph 8, A low-power transformer for a gas-insulated switchgear equipped with a redundant voltage sensor, characterized in that the first voltage sensor and the second voltage sensor are provided with a barrier having a predetermined reference width and a predetermined reference height difference from the voltage sensor between the first voltage sensor and the second voltage sensor to minimize inter-phase influence between the first voltage sensor and the second voltage sensor.

10. In Paragraph 9, A low-power transformer for a gas-insulated switchgear equipped with a redundant voltage sensor, characterized by maintaining the above-mentioned inter-phase influence within 0.2%.

11. In Paragraph 9, A low-power transformer for a gas-insulated switchgear equipped with a redundant voltage sensor, characterized in that the above-mentioned standard width has a value of 10 [mm] to 150 [mm].

12. In Paragraph 9, A low-power transformer for a gas-insulated switchgear equipped with a redundant voltage sensor, characterized in that the above-mentioned reference height has a value of 50 [mm] or less.

13. In Paragraph 9, A low-power transformer for a gas-insulated switchgear equipped with a redundant voltage sensor, wherein the barrier is characterized by increasing the vibration resistance performance of the voltage sensor by at least four times.

Images