Low-voltage capacitance compensation device

Abstract

The utility model discloses a low-voltage capacitance compensation device, which comprises a plurality of capacitor modules, a current transformer coupled with a bus and a compensation controller, the capacitor modules are all connected with the bus, each capacitor module comprises a capacitor, a contactor and a relay, the capacitor is connected with the bus after passing through the relay and the contactor, and the current transformer is connected with the compensation controller. The control end of the compensation controller is connected to the contactor and the relay in each capacitor module, and the detection end of the compensation controller is connected to the current transformer. The device is simple in structure, a plurality of capacitor modules are designed, corresponding capacitors can be started according to detection, and compensation can be completed under the optimal efficiency.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage capacitor compensation in power grids, and specifically to a low-voltage capacitor compensation device. Background Technology

[0002] During the operation of the hydropower plant's generating units, the plant's auxiliary power system is powered by the generator units. During the shutdown of all generating units and maintenance of the public system, the load of the auxiliary power system is powered by the power grid. During this period, the inductive loads in the plant need to absorb a large amount of reactive power from the power grid when they are running and starting up, which leads to a decrease in the power factor of the power grid. When it is lower than the power grid's assessment value, it will be subject to assessment by the power grid, which seriously affects the stable operation of the power grid system and the company's direct economic benefits. Utility Model Content

[0003] The purpose of this invention is to provide a low-voltage capacitor compensation device to solve the problem that existing hydropower plants need to absorb a large amount of reactive power from the power grid during the operation and startup of inductive loads, which leads to a decrease in the power factor of the power grid.

[0004] In order to achieve these objectives and other advantages according to the present invention:

[0005] A low-voltage capacitor compensation device includes several capacitor modules, a current transformer coupled to a busbar, and a compensation controller. The capacitor modules are all connected to the busbar. Each capacitor module includes a capacitor, a contactor, and a relay. The capacitor is connected to the busbar via the relay and the contactor. The control terminal of the compensation controller is connected to the contactor and the relay in each capacitor module, and its detection terminal is connected to the current transformer.

[0006] Furthermore, the aforementioned capacitor modules are connected in parallel and then connected to the busbar via an incoming circuit breaker.

[0007] Furthermore, it also includes an electric control mechanism to control the opening and closing of the incoming circuit breaker.

[0008] Furthermore, the aforementioned electric operating mechanism includes a motor, a closing switch, and a opening switch. When the closing switch is opened, the motor rotates forward, pushing the incoming circuit breaker to close; when the opening switch is opened, the motor rotates in reverse, pushing the incoming circuit breaker to open.

[0009] Furthermore, the aforementioned electric operating mechanism uses the MD-M4A1 model.

[0010] Furthermore, the aforementioned capacitor module includes a capacitor circuit breaker, and the capacitor is connected to the busbar via a relay, a contactor, and the capacitor circuit breaker.

[0011] Furthermore, the aforementioned busbar is also grounded via a surge arrester.

[0012] This utility model has at least the following beneficial effects: the device has a simple structure, is designed with multiple capacitor modules, and can activate the corresponding capacitors according to the detection, so as to complete the compensation at the best efficiency.

[0013] Other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the circuit structure of this device;

[0015] Figure 2 This is a schematic diagram of the circuit structure of the power controller;

[0016] Figure 3 This is a schematic diagram of the circuit structure of an electric meter;

[0017] Figure 4 This is a schematic diagram of the circuit structure of the electric operating mechanism. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0019] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. The following description relates to...

[0020] In the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this specification. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this specification as detailed in the appended claims.

[0021] The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of this specification. The singular forms “a,” “the,” and “the” as used in this specification and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0022] It should be understood that although the terms first, second, third, etc., may be used in this specification to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this specification, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0023] The solution proposed by this utility model is as follows:

[0024] like Figure 1-4 A low-voltage capacitor compensation device, comprising:

[0025] Ten capacitor modules are connected in parallel and then connected to the busbar via the incoming circuit breaker Q. Each capacitor module includes capacitors (C1-C10), relays (FR1-10), contactors (KM1-10), and capacitor circuit breakers (QF1-10). Within each capacitor module, the capacitors are connected to the incoming circuit breaker Q via relays, contactors, and capacitor circuit breakers. The capacitors (C1-C10) are low-voltage parallel capacitors, model BZMJ0.45(30-3); the relays (FR1-10) are thermal overload relays, model JR36-63(40-63A); the contactors (KM1-10) are AC contactors, model CJ19-6321(220V); the capacitor circuit breakers (QF1-10) are AC miniature circuit breakers, model NXB-63(3P D63); the incoming line circuit breaker Q is an AC molded case circuit breaker, model NXM-630SP / 3320(630AAC230V);

[0026] The bus-coupled current transformer is model BH-0.66 (100I 1200 / 5A 0.5 class).

[0027] The compensation controller includes a power controller and a power meter. The power meter's detection terminal is connected to the current transformer, and its signal output terminal is connected to the power controller. The power controller's control terminal is connected to the contactors and relays in each capacitor module. The power controller is a power factor controller, model NWKL1 (8 / 10220V), and the power meter is a multi-functional power meter, model PD7777-3S3 (380V 5A).

[0028] This utility model includes an electric operating mechanism, which is a commonly used structure, such as... Figure 4 As described above, after the closing switch HA is opened, the motor M rotates forward, pushing the incoming circuit breaker Q to close; after the opening switch TA is opened, the motor M rotates in reverse, pushing the incoming circuit breaker Q to open. The electric operating mechanism uses model MD-M4A1.

[0029] The busbar is also grounded via surge arrester F, model number HY15W-0.28 / 1.3.

[0030] In this application, the current transformer coupled to the busbar is detected by the power meter, and the detection signal is sent to the power controller. Based on the detection result, the power controller determines the compensation capacitor that needs to be connected to the busbar, and then controls several capacitors to be connected to the busbar to compensate the busbar.

[0031] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with this field, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A low-voltage capacitor compensation device, characterized in that, It includes several capacitor modules, a bus-coupled current transformer, and a compensation controller. The capacitor modules are all connected to the bus. Each capacitor module includes a capacitor, a contactor, and a relay. The capacitor is connected to the bus via the relay and contactor. The control terminal of the compensation controller is connected to the contactor and relay in each capacitor module, and its detection terminal is connected to the current transformer.

2. The low-voltage capacitor compensation device as described in claim 1, characterized in that, The capacitor modules are connected in parallel and then connected to the busbar via an incoming circuit breaker.

3. The low-voltage capacitor compensation device as described in claim 1, characterized in that, It also includes an electric control mechanism to control the opening and closing of the incoming circuit breaker.

4. A low-voltage capacitor compensation device as described in claim 3, characterized in that, The electric operating mechanism includes a motor, a closing switch, and an opening switch. When the closing switch is opened, the motor rotates forward, pushing the incoming circuit breaker to close; when the opening switch is opened, the motor rotates in reverse, pushing the incoming circuit breaker to open.

5. A low-voltage capacitor compensation device as described in claim 3, characterized in that, The electric operating mechanism is model MD-M4A1.

6. A low-voltage capacitor compensation device as described in claim 1, characterized in that, The capacitor module includes a capacitor circuit breaker, and the capacitor is connected to the busbar after passing through a relay, a contactor, and the capacitor circuit breaker.

7. A low-voltage capacitor compensation device as described in claim 1, characterized in that, The busbar is also grounded via a surge arrester.

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