Anti-10KV reactive compensation capacitor cabinet and overvoltage protection device thereof
By designing an overvoltage protection device in a 10KV high-voltage reactive power compensation capacitor cabinet, safety hazards and grid instability caused by open overvoltage are solved, and the safe and reliable operation of the equipment is achieved.
Patent Information
- Application Number
- CN202421531021.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-01
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-07-01
AI Technical Summary
Open overvoltage is prone to occur in the 10KV high-voltage reactive power compensation capacitor cabinet, resulting in equipment safety hazards and unstable power grid.
An overvoltage protection device is designed, including a zero-sequence overvoltage protection relay, a fault relay and a main relay. The device connects the secondary line of the open voltage of the voltage transformer to the coil of the zero-sequence overvoltage protection relay. When the opening voltage is greater than 10V, the relay operates to cut off the main circuit and avoid overvoltage.
It effectively avoids equipment safety hazards and grid instability caused by open voltage overvoltage, and improves the reliable operation and safety of the equipment.
Smart Images
Figure CN222868536U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of high-voltage power grids, and in particular to a 10KV reactive power compensation capacitor cabinet and an overvoltage protection device thereof. Background Art
[0002] High voltage reactive power compensation device is a reactive power compensation device used in power system, which aims to improve the power factor and voltage quality of power system. It is mainly used in high voltage power grid, industrial plant, large commercial buildings and other places.
[0003] The main function of the high-voltage reactive power compensation device is to achieve reactive power compensation by controlling the connection and disconnection of capacitors and reactors. When there are a large number of inductive loads in the power system, the power factor will be low, that is, there will be a large reactive power. The high-voltage reactive power compensation device can automatically adjust the connection and disconnection of capacitors and reactors according to the power factor requirements of the system to achieve reactive power compensation and improve the power factor.
[0004] At present, 10KV high-voltage reactive power compensation is prone to open overvoltage during operation, and some circuits will experience overvoltage and overcurrent during operation, and the ammeter pointer will swing back and forth. The main circuit has no zero-sequence overvoltage protection, which affects the stability of the power grid, brings certain safety hazards to the equipment, and brings certain risks to the operation and inspection personnel. Utility Model Content
[0005] In view of the above problems, the present application provides a 10KV reactive power compensation capacitor cabinet and an overvoltage protection device thereof to solve the problem that open overvoltage is prone to occur in the existing 10KV high-voltage reactive power compensation capacitor cabinet, which poses certain safety hazards to the equipment.
[0006] To achieve the above object, the inventor provides an overvoltage protection device for a 10KV reactive power compensation capacitor cabinet, comprising:
[0007] A zero-sequence overvoltage protection relay, the coil of which is arranged between the open voltage secondary lines of the voltage transformer of the reactive power compensation capacitor cabinet;
[0008] A fault relay, one end of the coil of the fault relay is connected to the first power supply terminal of the adjacent cabinet through the normally open point of the zero-sequence overvoltage protection relay, the other end of the coil of the fault relay is connected to the second power supply terminal of the adjacent cabinet, one end of the normally open point of the fault relay is connected to the first power supply terminal of the adjacent cabinet, and the other end of the normally open point of the fault relay is connected to the coil of the fault relay;
[0009] A main relay, wherein the normally closed point of the main relay is arranged on the main circuit of the voltage transformer, and the coil of the main relay is connected to the power supply of the adjacent cabinet through the normally closed point of the fault relay.
[0010] In some embodiments, a light emitting diode is further included, and the light emitting diode is arranged at one end of the coil of the zero-sequence overvoltage protection relay.
[0011] In some embodiments, an indicator light is also included, which is arranged at one end of the normally open point of the zero-sequence overvoltage protection relay.
[0012] In some embodiments, a reset button is further included, and the reset button is arranged between one end of the normally open point of the fault relay and the first power supply end of the adjacent cabinet.
[0013] Another technical solution is also provided, a 10KV reactive power compensation capacitor cabinet, including an overvoltage protection device, the overvoltage protection device comprising:
[0014] A zero-sequence overvoltage protection relay, the coil of which is arranged between the open voltage secondary lines of the voltage transformer of the reactive power compensation capacitor cabinet;
[0015] A fault relay, one end of the coil of the fault relay is connected to the first power supply terminal of the adjacent cabinet through the normally open point of the zero-sequence overvoltage protection relay, the other end of the coil of the fault relay is connected to the second power supply terminal of the adjacent cabinet, one end of the normally open point of the fault relay is connected to the first power supply terminal of the adjacent cabinet, and the other end of the normally open point of the fault relay is connected to the coil of the fault relay;
[0016] A main relay, wherein the normally closed point of the main relay is arranged on the main circuit of the voltage transformer, and the coil of the main relay is connected to the power supply of the adjacent cabinet through the normally closed point of the fault relay.
[0017] In some embodiments, the overvoltage protection device further includes a light emitting diode, which is disposed at one end of the coil of the zero-sequence overvoltage protection relay.
[0018] In some embodiments, the overvoltage protection device further includes an indicator light, which is disposed at one end of a normally open point of the zero-sequence overvoltage protection relay.
[0019] In some embodiments, the overvoltage protection device further includes a reset button, and the reset button is arranged between one end of the normally open point of the fault relay and the first power supply end of the adjacent cabinet.
[0020] Different from the prior art, the above technical scheme connects the open voltage secondary line of the voltage transformer in the 10KV reactive compensation capacitor cabinet to the coil of the zero-sequence overvoltage protection relay. When the open voltage is greater than 10V, the zero-sequence overvoltage protection relay is activated, and the normally open point of the zero-sequence overvoltage protection relay is closed. The coil of the fault relay is energized, and then the fault relay is started. At this time, the normally closed point of the fault relay is closed, causing the fault relay to self-lock. At the same time, the normally closed point of the fault relay is disconnected, causing the main relay to be disconnected, thereby cutting off the main circuit and disconnecting the entire primary circuit, thereby avoiding safety hazards to the equipment due to the open voltage overvoltage generated by the 10KV reactive compensation capacitor cabinet.
[0021] The above-mentioned records related to the content of the utility model are only an overview of the technical solution of the present application. In order to enable ordinary technicians in the field to more clearly understand the technical solution of the present application, and then implement it according to the text of the specification and the contents recorded in the drawings, and to make the above-mentioned purpose and other purposes, features and advantages of the present application easier to understand, the following is an explanation in combination with the specific implementation method and drawings of the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] The drawings are only used to illustrate the principles, implementation methods, applications, characteristics and effects of the specific embodiments of the present application and other related contents, and shall not be considered as limitations of the present application.
[0023] In the drawings of the specification:
[0024] Figure 1 A circuit schematic diagram of an overvoltage protection device for a 10KV reactive power compensation capacitor cabinet as described in a specific implementation method;
[0025] Figure 2 A circuit schematic diagram of a voltage transformer described in a specific implementation manner;
[0026] Figure 3 Another circuit schematic diagram of the overvoltage protection device for the 10KV reactive power compensation capacitor cabinet described in the specific implementation method;
[0027] Figure 4 Another circuit schematic diagram of the overvoltage protection device for the 10KV reactive power compensation capacitor cabinet described in the specific implementation method;
[0028] Figure 5 It is a connection diagram of the coil of the zero-sequence overvoltage protection relay described in the specific implementation method. DETAILED DESCRIPTION
[0029] In order to explain in detail the possible application scenarios, technical principles, specific schemes that can be implemented, and the purposes and effects that can be achieved, the following is a detailed description of the specific embodiments listed in conjunction with the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.
[0030] Reference to "embodiment" herein means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The term "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or association with other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the various technical features mentioned in the embodiments can be combined in any way to form a corresponding implementable technical solution.
[0031] Unless otherwise defined, the technical terms used in this document have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms in this document is only for describing specific embodiments and is not intended to limit this application.
[0032] In the description of this application, the term "and / or" is an expression used to describe the logical relationship between objects, indicating that three relationships may exist, for example, A and / or B, which means: A exists, B exists, and A and B exist at the same time. In addition, the character " / " in this article generally indicates that the objects before and after are in an "or" logical relationship.
[0033] In the present application, terms such as “first” and “second” are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship of quantity, priority or sequence between these entities or operations.
[0034] Without further limitations, in this application, the words "include", "comprises", "has" or other similar expressions used in the sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those limited elements, but also other elements not explicitly listed, or also include elements inherent to such process, method or product.
[0035] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than", "less than", "exceed" and the like are understood to exclude the number itself; expressions such as "above", "below", "within" and the like are understood to include the number itself. In addition, in the description of the embodiments of this application, "multiple" means more than two (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups", "multiple times", etc., unless otherwise clearly and specifically limited.
[0036] In the description of the embodiments of the present application, space-related expressions used, such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or position relationship based on the orientation or position relationship shown in the specific embodiments or drawings, and are only for the convenience of describing the specific embodiments of the present application or facilitating the reader's understanding, and do not indicate or imply that the referred device or component must have a specific position, a specific orientation, or be constructed or operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.
[0037] Unless otherwise expressly specified or limited, in the description of the embodiments of the present application, the terms such as "install", "connect", "connect", "fix", "set", etc. used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integrated setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For technicians in the technical field to which the present application belongs, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.
[0038] To solve the problem that when problems occur in the existing reactive power compensation capacitor cabinet, they cannot be discovered in time and even missed inspection; at the same time, when the compensation capacitor cabinet has attenuation three-phase imbalance, it is impossible to warn and quickly suppress the expansion of the accident, and it is very easy to cause safety hazards and electrical fire accidents such as equipment running with problems and power outages with hidden dangers.
[0039] See also Figure 1-2 This embodiment provides an overvoltage protection device for a 10KV reactive power compensation capacitor cabinet, including:
[0040] A zero-sequence overvoltage protection relay KA, wherein the coil of the zero-sequence overvoltage protection relay KA is arranged between the open voltage secondary lines of the voltage transformer of the reactive power compensation capacitor cabinet;
[0041] A fault relay, one end of the coil of the fault relay is connected to the first power supply terminal of the adjacent cabinet through the normally open point of the zero-sequence overvoltage protection relay KA, the other end of the coil of the fault relay is connected to the second power supply terminal of the adjacent cabinet, one end of the normally open point of the fault relay is connected to the first power supply terminal of the adjacent cabinet, and the other end of the normally open point of the fault relay is connected to the coil of the fault relay;
[0042] A main relay, wherein the normally closed point of the main relay is arranged on the main circuit of the voltage transformer, and the coil of the main relay is connected to the power supply of the adjacent cabinet through the normally closed point of the fault relay.
[0043] By connecting the open voltage secondary line of the voltage transformer in the 10KV reactive compensation capacitor cabinet to the coil of the zero-sequence overvoltage protection relay KA, when the open voltage is greater than 10V, the zero-sequence overvoltage protection relay KA will be activated, and the normally open point of the zero-sequence overvoltage protection relay KA will be closed. The coil of the fault relay will be energized, and then the fault relay will be started. At this time, the normally closed point of the fault relay will be closed, causing the fault relay to self-lock. At the same time, the normally closed point of the fault relay will be disconnected, causing the main relay to be disconnected, thereby cutting off the main circuit and disconnecting the entire primary circuit, avoiding safety hazards to the equipment due to the open voltage overvoltage generated by the 10KV reactive compensation capacitor cabinet.
[0044] See also Figure 3 In some embodiments, an indicator light HG is also included, and the indicator light HG is arranged at one end of the normally open point of the zero-sequence overvoltage protection relay KA.
[0045] By setting an indicator light HG at one end of the normally open point of the zero-sequence overvoltage protection relay KA, when the zero-sequence overvoltage protection relay KA is actuated and the normally open point of the zero-sequence overvoltage protection relay KA is closed, the indicator light HG lights up, and relevant personnel can be notified to conduct investigation.
[0046] See also Figure 4 In some embodiments, a reset button SF is further included, and the reset button SF is arranged between one end of the normally open point of the fault relay and the first power supply end of the adjacent cabinet.
[0047] By setting a reset button SF between one end of the normally open point of the fault relay and the first power supply end of the adjacent cabinet, when the maintenance personnel confirms that the power supply has been restored after the accident, the reset button SF is pressed to cut off the power to the coil of the fault relay, thereby causing the fault relay contacts to self-lock, so that the secondary circuit can be used normally.
[0048] See also Figure 5 In some embodiments, a light emitting diode D is further included, and the light emitting diode D is arranged at one end of the coil of the zero-sequence overvoltage protection relay KA.
[0049] By setting a light-emitting diode D at one end of the coil of the zero-sequence overvoltage protection relay KA, when an opening voltage is generated, although the opening voltage does not exceed 10V and will not cause the zero-sequence overvoltage protection relay KA to operate, the light-emitting diode D will light up as a pre-alarm signal.
[0050] In the above technical solution, a zero-sequence overvoltage protection relay KA is added to the secondary circuit. When the primary system has a three-phase load imbalance during the operation of the primary components such as capacitors and reactors, or a single-phase grounding of the primary equipment occurs, the discharge coil of the voltage transformer will generate an opening voltage L601 and N630. The opening voltage secondary lines L601 and N630 generated by the discharge coil are connected to the coil of the zero-sequence overvoltage protection relay KA. When the generated opening voltage is 2-10V, the zero-sequence overvoltage protection relay KA does not operate. At this time, the photodiode lights up as a pre-alarm signal. When the generated opening voltage is greater than 10V, the zero-sequence overvoltage protection relay KA operates, and the zero-sequence overvoltage protection relay KA operates and starts the fault relay KAT at the same time; the fault relay KAT is self-locked after the operation, and the normally closed contact of the fault relay KAT is disconnected to cut off the main circuit of the main relay KM, and the entire primary circuit is disconnected; after the fault relay KAT is self-locked, the indicator light HG is turned on to notify relevant personnel to conduct an investigation. When confirming that the power supply has been restored after the accident, the reset button SF must be pressed before the secondary circuit can be used normally.
[0051] This solution has the following advantages:
[0052] Advantage 1: If the equipment is running with hidden dangers, it can be seen at a glance.
[0053] Advantage 2: When a device fails, the power supply can be quickly cut off to prevent the accident from expanding, and the fault indicator light can be turned on to prevent secondary accidents caused by blind power supply.
[0054] Advantage 3: Improve the reliable operation and safety of the equipment. If the fault is not promptly checked and eliminated, power cannot be restored.
[0055] Another technical solution is provided, a 10KV reactive compensation capacitor cabinet, including an overvoltage protection device, please refer to Figure 1-2 , the overvoltage protection device comprises:
[0056] A zero-sequence overvoltage protection relay KA, wherein the coil of the zero-sequence overvoltage protection relay KA is arranged between the open voltage secondary lines of the voltage transformer of the reactive power compensation capacitor cabinet;
[0057] A fault relay, one end of the coil of the fault relay is connected to the first power supply terminal of the adjacent cabinet through the normally open point of the zero-sequence overvoltage protection relay KA, the other end of the coil of the fault relay is connected to the second power supply terminal of the adjacent cabinet, one end of the normally open point of the fault relay is connected to the first power supply terminal of the adjacent cabinet, and the other end of the normally open point of the fault relay is connected to the coil of the fault relay;
[0058] A main relay, wherein the normally closed point of the main relay is arranged on the main circuit of the voltage transformer, and the coil of the main relay is connected to the power supply of the adjacent cabinet through the normally closed point of the fault relay.
[0059] By connecting the open voltage secondary line of the voltage transformer in the 10KV reactive compensation capacitor cabinet to the coil of the zero-sequence overvoltage protection relay KA, when the open voltage is greater than 10V, the zero-sequence overvoltage protection relay KA will be activated, and the normally open point of the zero-sequence overvoltage protection relay KA will be closed. The coil of the fault relay will be energized, and then the fault relay will be started. At this time, the normally closed point of the fault relay will be closed, causing the fault relay to self-lock. At the same time, the normally closed point of the fault relay will be disconnected, causing the main relay to be disconnected, thereby cutting off the main circuit and disconnecting the entire primary circuit, avoiding safety hazards to the equipment due to the open voltage overvoltage generated by the 10KV reactive compensation capacitor cabinet.
[0060] See also Figure 3 In some embodiments, an indicator light HG is also included, and the indicator light HG is arranged at one end of the normally open point of the zero-sequence overvoltage protection relay KA.
[0061] By setting an indicator light HG at one end of the normally open point of the zero-sequence overvoltage protection relay KA, when the zero-sequence overvoltage protection relay KA is actuated and the normally open point of the zero-sequence overvoltage protection relay KA is closed, the indicator light HG lights up, and relevant personnel can be notified to conduct investigation.
[0062] See also Figure 4 In some embodiments, a reset button SF is further included, and the reset button SF is arranged between one end of the normally open point of the fault relay and the first power supply end of the adjacent cabinet.
[0063] By setting a reset button SF between one end of the normally open point of the fault relay and the first power supply end of the adjacent cabinet, when the maintenance personnel confirms that the power supply has been restored after the accident, the reset button SF is pressed to cut off the power to the coil of the fault relay, thereby causing the fault relay contacts to self-lock, so that the secondary circuit can be used normally.
[0064] See also Figure 5 In some embodiments, a light emitting diode D is further included, and the light emitting diode D is arranged at one end of the coil of the zero-sequence overvoltage protection relay KA.
[0065] By setting a light-emitting diode D at one end of the coil of the zero-sequence overvoltage protection relay KA, when an opening voltage is generated, although the opening voltage does not exceed 10V and will not cause the zero-sequence overvoltage protection relay KA to operate, the light-emitting diode D will light up as a pre-alarm signal.
[0066] Finally, it should be noted that although the above embodiments have been described in the specification and drawings of this application, this does not limit the scope of patent protection of this application. All technical solutions generated by replacing or modifying equivalent structures or equivalent processes based on the essential concept of this application using the contents recorded in the specification and drawings of this application, as well as directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, are included in the scope of patent protection of this application.
Claims
1. An overvoltage protection device for a 10KV reactive compensation capacitor cabinet, characterized in that: include: A zero-sequence overvoltage protection relay, the coil of which is arranged between the open voltage secondary lines of the voltage transformer of the reactive power compensation capacitor cabinet; A fault relay, one end of the coil of the fault relay is connected to the first power supply terminal of the adjacent cabinet through the normally open point of the zero-sequence overvoltage protection relay, the other end of the coil of the fault relay is connected to the second power supply terminal of the adjacent cabinet, one end of the normally open point of the fault relay is connected to the first power supply terminal of the adjacent cabinet, and the other end of the normally open point of the fault relay is connected to the coil of the fault relay; A main relay, wherein the normally closed point of the main relay is arranged on the main circuit of the voltage transformer, and the coil of the main relay is connected to the power supply of the adjacent cabinet through the normally closed point of the fault relay.
2. The overvoltage protection device for the 10KV reactive power compensation capacitor cabinet according to claim 1 is characterized in that: It also includes a light emitting diode, which is arranged at one end of the coil of the zero-sequence overvoltage protection relay.
3. The overvoltage protection device for the 10KV reactive power compensation capacitor cabinet according to claim 1 is characterized in that: It also includes an indicator light, which is arranged at one end of the normally open point of the zero-sequence overvoltage protection relay.
4. The overvoltage protection device for the 10KV reactive power compensation capacitor cabinet according to claim 1 is characterized in that: It also includes a reset button, which is arranged between one end of the normally open point of the fault relay and the first power supply end of the adjacent cabinet.
5. A 10KV reactive power compensation capacitor cabinet, characterized in that: An overvoltage protection device is included, wherein the overvoltage protection device includes: A zero-sequence overvoltage protection relay, the coil of which is arranged between the open voltage secondary lines of the voltage transformer of the reactive power compensation capacitor cabinet; A fault relay, one end of the coil of the fault relay is connected to the first power supply terminal of the adjacent cabinet through the normally open point of the zero-sequence overvoltage protection relay, the other end of the coil of the fault relay is connected to the second power supply terminal of the adjacent cabinet, one end of the normally open point of the fault relay is connected to the first power supply terminal of the adjacent cabinet, and the other end of the normally open point of the fault relay is connected to the coil of the fault relay; A main relay, wherein the normally closed point of the main relay is arranged on the main circuit of the voltage transformer, and the coil of the main relay is connected to the power supply of the adjacent cabinet through the normally closed point of the fault relay.
6. The 10KV reactive power compensation capacitor cabinet according to claim 5 is characterized in that: The overvoltage protection device further comprises a light emitting diode, which is arranged at one end of the coil of the zero-sequence overvoltage protection relay.
7. The 10KV reactive power compensation capacitor cabinet according to claim 5 is characterized in that: The overvoltage protection device also includes an indicator light, which is arranged at one end of the normally open point of the zero-sequence overvoltage protection relay.
8. The 10KV reactive power compensation capacitor cabinet according to claim 5 is characterized in that: The overvoltage protection device also includes a reset button, which is arranged between one end of the normally open point of the fault relay and the first power supply end of the adjacent cabinet.