Low-power transformer for gas insulated switchgear provided with current sensor having shielding function

Abstract

The present invention relates to a low-power current transformer which is for a gas insulated switchgear and provided with a current sensor having a shielding function, wherein the shielding function and a current detection function are integrated in the gas insulated switchgear, thus making it possible to reduce the size of the gas insulated switchgear, and the shielding function is included in a current sensor, which is a component of the low-power current transformer, and can be duplicated to enhance the reliability of the gas insulated switchgear. The low-power transformer which is for a gas insulated switchgear and provided with a current sensor having a shielding function according to the present invention comprises: the current sensor for detecting the current flowing through a conductor inside the gas insulated switchgear; and a voltage sensor for detecting the voltage across the conductor inside the gas insulated switchgear.

Description

Low-power transformer for gas-insulated switchgear equipped with shield function current sensor

[0001] The present invention relates to a low-power transformer for a gas-insulated switchgear equipped with a shielding function current sensor, and more specifically, to integrating a shielding function and a current detection function within the gas-insulated switchgear. Furthermore, the present invention relates to a low-power transformer for a gas-insulated switchgear equipped with a shielding function current sensor that enables the miniaturization of the gas-insulated switchgear by including a shielding function in the current detector, which is a component of the low-power transformer.

[0002] Generally, a gas-insulated switchgear is a switchgear that maintains insulation by housing busbars, switchgear, 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.

[0003] In the event of serious abnormalities such as equipment failure, natural phenomena like lightning strikes, transmission line disconnections, leakage currents, or short circuits occurring in the power grid, external substations, or power plants, the power grid and the power plant are isolated to prevent equipment damage and the spread of ripple effects.

[0004] 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.

[0005] For example, Korean Registered Patent No. 10-2681438 discloses a low-power transformer applicable to a digital substation, which is configured with a primary side output device including two current transformers (CT) and a voltage transformer (VT), and a secondary side output device including an AD / DC circuit that performs digitization of an analog signal and a communication circuit.

[0006] However, there is a disadvantage in that the shield inside the gas-insulated switchgear is formed independently of the current transformer and transformer, making miniaturization difficult.

[0007] The objective of the present invention is to provide a low-power transformer for a gas-insulated switchgear equipped with a shielding function current sensor that can miniaturize the gas-insulated switchgear by integrating a shielding function and a current detection function within the gas-insulated switchgear.

[0008] Another objective of the present invention is to provide a low-power transformer for a gas-insulated switchgear equipped with a shielded current sensor that can increase the reliability of the gas-insulated switchgear by including a shielding function in the current detector, which is a component of the low-power transformer, and by duplicating it.

[0009] A low-power transformer for a gas-insulated switchgear equipped with a shield function current 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.

[0010] Here, the current sensor and voltage sensor are connected to a converter so that the analog signal can be converted into digital.

[0011] In addition, the current sensor may be equipped with a conductor and a concentric coil.

[0012] Here, a Rogowski coil can be used as the current sensor.

[0013] In addition, the current sensor can perform a shielding function by being connected to the enclosure and ground near the enclosure.

[0014] Here, the current sensor may be configured with a redundancy structure by having a first current sensor and a second current sensor.

[0015] In addition, the voltage sensor is equipped with a conductor in a concentric cylindrical shape and can detect voltage based on capacitance.

[0016] Here, the voltage sensor may be configured with a redundancy structure by having a first voltage sensor and a second voltage sensor.

[0017] In addition, the first voltage sensor and the second voltage sensor can be separated by at least a certain distance to minimize inter-phase influence.

[0018] Here, the inter-phase influence can be maintained within 0.2%.

[0019] In addition, the separation distance can have a value of 10 [mm] to 150 [mm].

[0020] The low-power transformer for a gas-insulated switchgear equipped with a shield function current sensor according to the present invention has the advantage of enabling the miniaturization of the gas-insulated switchgear by integrating a shield function and a current detection function within the gas-insulated switchgear.

[0021] In addition, the low-power transformer for a gas-insulated switchgear equipped with a shielded current sensor according to the present invention has the advantage of increasing the reliability of the gas-insulated switchgear by including a shielding function in the current detector, which is a component of the low-power transformer, and by duplicating it.

[0022] FIG. 1 is a cross-sectional view showing a low-power transformer for a gas-insulated switchgear equipped with a shield function current sensor according to one embodiment of the present invention.

[0023] FIG. 2 is a detailed perspective view of a gas-insulated switchgear including the current sensor and voltage sensor of FIG. 1.

[0024] Hereinafter, specific embodiments for carrying out the present invention will be described with reference to the attached drawings.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] In addition, the shapes and sizes of elements in the drawings may be exaggerated for clearer explanation.

[0030] Hereinafter, a low-power transformer for a gas-insulated switchgear equipped with a shield function current sensor according to the present invention will be described in detail with reference to the attached drawings.

[0031]

[0032] FIG. 1 is a cross-sectional view showing a low-power transformer for a gas-insulated switchgear equipped with a shield function current sensor according to one embodiment of the present invention, and FIG. 2 is a perspective view for explaining FIG. 1 in detail.

[0033] Hereinafter, a low-power transformer for a gas-insulated switchgear equipped with a shield function current sensor according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

[0034] First, referring to FIG. 1, a low-power transformer for a gas-insulated switchgear equipped with a shield function current 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.

[0035] Here, the current sensor (100) is provided with a concentric coil with a conductor (500) using a Rogowski coil. At this time, 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).

[0036] Typically, Low Power Instruments Transformers (LPITs) required for digital substations are configured with redundancy to improve product reliability.

[0037] At this time, the voltage sensor (200) must form an equal electric field between the conductor (500) and the voltage sensor (200) to ensure an accurate output without mutual influence, based on the principle of measuring voltage using stray capacitance. Additionally, even if a failure occurs in one of the redundant voltage sensors, it must not affect the equal electric field of the other voltage sensor.

[0038] A low-power transformer for a gas-insulated switchgear equipped with a shield function current sensor according to the present invention can reduce its size by having a current sensor (100) composed of a Rogowski coil on the outer edge to simultaneously perform current measurement and shielding functions for an equal electric field of the voltage sensor (200). In addition, the mutual influence between the first voltage sensor (210) and the second voltage sensor (220) is minimized by reflecting the optimal value of the separation distance (D200) between the first voltage sensor (210) and the second voltage sensor (220).

[0039] Here, 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] At this time, the first voltage sensor (210) and the second voltage sensor (220) are separated by at least a certain separation distance (D200) to minimize the inter-phase influence between the first voltage sensor (210) and the second voltage sensor (220). For example, the inter-phase influence is maintained within 0.2%, and the separation distance may have a value of 10 mm to 150 mm.

[0041] A low-power transformer for a gas-insulated switchgear equipped with a shield function current sensor according to the present invention is configured with an equal electric field to stabilize the output characteristics of the voltage sensor (200), and the first voltage sensor (210) and the second voltage sensor (220) are separated by a distance (D200) or more. In addition, near the enclosure (400), the current sensor (100) composed of a Rogowski coil performs both current measurement and shielding functions, thereby minimizing the size of the module. For example, in the present invention, the current sensor (100) performs current measurement and shielding functions simultaneously, thereby reducing the length of the gas-insulated switchgear by about 50 to 100 mm.

[0042]

[0043] FIG. 2 is a detailed perspective view of a gas-insulated switch including the current sensor (100) and voltage sensor (200) of FIG. 1.

[0044] 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 installed inside the enclosure (400) in a redundant manner.

[0045] In the interior of the enclosure (400), a shield is required for each conductor (500), and the current sensor (100) according to the present invention performs the role of shielding as well as detecting current, thereby allowing the gas-insulated switch to be miniaturized.

[0046] In addition, the voltage sensor (200) according to the present invention can minimize the inter-phase influence between the first voltage sensor (210) and the second voltage sensor (220) by maintaining a distance of at least a certain separation distance (D200) between the first voltage sensor (210) and the second voltage sensor (220).

[0047]

[0048] As described above, the low-power transformer for a gas-insulated switchgear equipped with a shield function current sensor according to the present invention has the advantage of enabling the miniaturization of the gas-insulated switchgear by integrating a shield function and a current detection function within the gas-insulated switchgear. Furthermore, by including a shield function in the current detector, which is a component of the low-power transformer, and duplicating it, it has the advantage of increasing the reliability of the gas-insulated switchgear.

[0049]

[0050] 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.

[0051] The present invention relates to a low-power transformer for a gas-insulated switchgear equipped with a shield function current 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 shielded current 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 shielded current 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 shielded current sensor, characterized in that the current sensor is provided with a concentric coil with the conductor.

4. In Paragraph 3, A low-power transformer for a gas-insulated switchgear equipped with a shielded current sensor characterized by using a Rogowski coil.

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

6. In Paragraph 1, A low-power transformer for a gas-insulated switchgear equipped with a shielded current sensor, characterized in that the above-mentioned 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 shielded current sensor, characterized in that the voltage sensor is provided in a concentric cylindrical shape with the conductor and detects voltage based on capacitance.

8. In Paragraph 1, A low-power transformer for a gas-insulated switchgear equipped with a shielded current 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 shielded current sensor, characterized in that the first voltage sensor and the second voltage sensor maintain a separation distance of at least a certain distance 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 shielded current 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 shield function current sensor, characterized in that the above separation distance has a value of 10 [mm] to 150 [mm].

Images