Composite capacitor electronic mutual inductor post insulator

Abstract

The utility model discloses a kind of composite capacitance electronic mutual inductor support post insulator, core body is externally provided umbrella skirt, and the circuit for connecting capacitor is placed in core body and includes main path and branch;Two metal inserts are respectively arranged at the head and tail side of core body, and the metal insert of head side is used for connecting electricity, and the metal insert of tail side is used for grounding;The head end of main path is connected with the metal insert of head side, and the tail end is insulated from the metal insert of tail side;The branch is connected with the metal insert of tail side.The utility model ingeniously integrates partial pressure capacitor in support post insulator, and this integrated design significantly reduces the workload of field installation.Compared with the traditional way of installing partial pressure capacitor outdoors, it avoids problems caused by differences in field installation technology, environmental factors and other factors, effectively reduces installation cost and construction difficulty, and improves the overall stability and reliability of the equipment.

Description

Technical Field

[0001] This utility model relates to a composite capacitor electronic current transformer support insulator. Background Technology

[0002] In traditional capacitive voltage transformers, the voltage-dividing capacitors are typically installed outdoors, and their insulation performance is easily affected by environmental factors. For example, humid weather can lead to a decrease in insulation performance, affecting measurement accuracy and even causing electrical faults. The installation of voltage-dividing capacitors is relatively complex, requiring on-site mounting on capacitor supports and use in conjunction with post insulators. This installation method not only increases the difficulty and cost of on-site construction but also, due to the large number of connecting components, may lead to problems such as poor contact during long-term operation, thus affecting the stability and reliability of the voltage transformer.

[0003] Conventional instrument transformer post insulators lack integrated capacitor voltage divider structures, failing to meet the requirements of modern power systems for miniaturization, integration, and high performance of voltage transformers. With the continuous expansion of power system scale and the increasing voltage levels, traditional instrument transformer post insulators are gradually becoming inadequate for the complex power grid operating environment and the demands for high-precision measurement. Summary of the Invention

[0004] This utility model provides a composite capacitor electronic current transformer support insulator to solve the problems existing in the prior art.

[0005] The technical solutions adopted in this utility model are as follows:

[0006] A composite capacitor electronic instrument transformer post insulator includes a core, with sheds disposed outside the core, and further includes...

[0007] A capacitor connection line, which is located inside the core and includes a main circuit and branch circuits;

[0008] Metal inserts: Two metal inserts are respectively located on the head and tail sides of the core. The metal insert on the head side is used for power connection, and the metal insert on the tail side is used for grounding.

[0009] The head end of the main road is connected to the metal insert on the head side, and the tail end is isolated from the metal insert on the tail side; the branch road is connected to the metal insert on the tail side.

[0010] Furthermore, a main capacitor is provided on the main line, and branch capacitors are provided on the branch lines.

[0011] Furthermore, a first connector is provided on the metal insert on the tail side for connecting to the branch.

[0012] Furthermore, a second connector is provided at the rear end of the main road.

[0013] Furthermore, a detection port for exposing the first and second connectors is provided on the side wall of the umbrella skirt.

[0014] Furthermore, the outer wall of the umbrella skirt is provided with a shielding ring.

[0015] Furthermore, a stainless steel plate is also provided on the tail side of the core.

[0016] Furthermore, the upper end of the umbrella skirt is provided with a protrusion.

[0017] This utility model has the following beneficial effects:

[0018] By cleverly integrating the voltage divider capacitors inside the post insulator, this integrated design significantly reduces on-site installation work. Compared to the traditional method of installing voltage divider capacitors outdoors, it avoids problems caused by differences in on-site installation techniques and environmental interference, effectively reducing installation costs and construction difficulty, while improving the overall stability and reliability of the equipment.

[0019] The stainless steel plate installed on the tail side of the core greatly enhances the mechanical strength of the insulator, enabling it to easily withstand various mechanical stresses such as wind loads and seismic forces. The rational layout of the metal inserts and the robust connection method of each component further improve the mechanical stability of the equipment, ensuring long-term reliable operation in complex environments.

[0020] The umbrella skirt has a test port on its side wall, which facilitates the lead-out of the first and second connectors, allowing for easy connection to external measuring equipment for capacitance and voltage division ratio measurements. Meanwhile, the raised section at the top of the umbrella skirt and the stepped surface design of the metal insert on the head side create a good seal during assembly, effectively preventing moisture ingress and reducing measurement errors and equipment failure risks caused by internal moisture, thus lowering maintenance costs and repair frequency. Attached Figure Description

[0021] Fig. 1 This is a cross-sectional view of the present invention.

[0022] Fig. 2 This is a structural diagram of the present utility model.

[0023] Fig. 3 This is a structural diagram of a capacitor connection circuit.

[0024] Fig. 4 This is a magnified view of a portion of the upper surface of the insulator. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings.

[0026] like Figs. 1 to 4This utility model discloses a composite capacitor electronic current transformer support insulator, including a core 1, a skirt 2, a capacitor connection line 3, and a metal insert 4. The core 1 serves as the basic support structure of the entire insulator and is formed by casting with epoxy resin. The skirt 2 is provided outside the core 1.

[0027] The capacitor circuit 3 is located inside the core 1, including a main circuit 31 and a branch circuit 32. The main circuit 31 and branch circuit 32 are respectively equipped with a main capacitor 33 and a branch capacitor 34, realizing the voltage division measurement function. Two metal inserts 4 are respectively located at the head and tail sides of the core 1; the one at the head side is used for power connection, and the one at the tail side is used for grounding, providing the necessary electrical connection points for the measurement circuit. The outer wall of the umbrella skirt 2 is equipped with a shielding ring 5, which can shield external electromagnetic interference and ensure measurement accuracy.

[0028] The tail side of the core 1 is also provided with a stainless steel plate 6, which further enhances the mechanical strength, stability and moisture resistance of the insulator. The stainless steel plate 6 makes the entire bottom surface flat and completely covers the epoxy, and seals it with sealant, because epoxy is susceptible to moisture.

[0029] The upper end of the umbrella skirt 2 is provided with a protrusion 20, and the upper end surface of the metal insert 4 on the head side forms a stepped surface. During assembly, it contacts the assembly surface of the mounting carrier to form a seal, prevent moisture from entering, and extend the service life of the insulator.

[0030] Two metal inserts 4 are located on the head and tail sides of the core 1, respectively. The metal insert 4 on the head side is used for power connection, connecting to the high-voltage power supply to provide high-voltage input for the entire capacitor voltage divider circuit. The metal insert 4 on the tail side is used for grounding, ensuring the safety and stability of the measurement circuit.

[0031] The head end of the main circuit 31 is connected to the metal insert 4 on the head side, while the tail end is isolated from the metal insert 4 on the tail side, ensuring the unidirectionality of the high voltage input and avoiding interference from current backflow on the measurement results.

[0032] Branch circuit 32 is connected to the metal insert 4 on the tail side, allowing the dividing capacitor 34 to participate in voltage division. The metal insert 4 on the tail side is provided with a first connector 41, which is connected to branch circuit 32; the tail side of main circuit 31 is provided with a second connector 42. These two connectors are led out through the detection port 21 on the side wall of the umbrella skirt 2, which facilitates connection with external measuring equipment for measuring capacitance value and voltage division ratio.

[0033] The measurement method of this utility model includes the following steps:

[0034] Main capacitor measurement: Connect the high-voltage terminal of the high-voltage bridge to the metal insert 4 on the head side, and connect the low-voltage terminal of the high-voltage bridge to the tail side of the main circuit 31 using the second connector 42. At this time, the high-voltage bridge applies high voltage to the main capacitor 33, and the main capacitor 33 begins to charge and discharge. After the circuit stabilizes, the high-voltage bridge reads the capacitance value of the main capacitor 33 and records it as pF.

[0035] Capacitance measurement: Similarly, connect the high-voltage terminal of the high-voltage bridge to the metal insert 4 on the head side, but this time connect the low-voltage terminal of the high-voltage bridge to the metal insert 4 on the tail side using the first connector 41. The high-voltage bridge applies high voltage to the capacitor 34, causing the capacitor 34 to begin charging and discharging. After the circuit stabilizes, the high-voltage bridge reads the capacitance value of the capacitor 34 and records it as nF.

[0036] Calculate the partial voltage ratio:

[0037] After converting the values ​​of the main capacitor and the branch capacitor to equivalent units, divide the branch capacitor value by the main capacitor value to obtain the voltage division ratio (Vout / Vin). The formula for calculating the voltage division ratio is:

[0038] ,

[0039] Wherein, 𝐶1 is the main capacitance value, and 𝐶2 is the sub-capacitor value.

[0040] The calculated voltage division ratio is compared with the design voltage division ratio. If the actual measured voltage division ratio is within the allowable error range, the performance of the composite capacitor electronic instrument transformer post insulator is considered to meet the design requirements; if it exceeds the error range, further analysis of the cause and corresponding adjustments are required.

[0041] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements can be made without departing from the principle of the present utility model, and these improvements should also be considered within the protection scope of the present utility model.

Claims

1. A composite capacitor electronic current transformer post insulator, comprising a core (1), wherein a skirt (2) is provided outside the core (1), characterized in that: Also includes The capacitor connection line (3) is placed inside the core (1) and includes a main circuit (31) and a branch circuit (32). Metal inserts (4), two metal inserts (4) are respectively located on the head and tail sides of the core (1). The metal insert (4) on the head side is used for power connection, and the metal insert (4) on the tail side is used for grounding. The head end of the main road (31) is connected to the metal insert (4) on the head side, and the tail end is isolated from the metal insert (4) on the tail side; the branch road (32) is connected to the metal insert (4) on the tail side. The main road (31) is provided with a main capacitor (33), and the branch road (32) is provided with a branch capacitor (34). The metal insert (4) located on the tail side is provided with a first connector (41) for connecting to the branch (32); The main road (31) is provided with a second connector (42) at its rear side. The side wall of the umbrella skirt (2) is provided with a detection port (21) for exposing the first connector (41) and the second connector (42). The outer wall of the umbrella skirt (2) is provided with a shielding ring (5); The tail side of the core (1) is also provided with a stainless steel plate (6). The upper end of the umbrella skirt (2) is provided with a protrusion (20).

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