Composite capacitance electronic transformer post insulator and measurement method

Abstract

The invention relates to a composite capacitor electronic transformer post insulator and a measuring method. An umbrella skirt is arranged outside a core body, and a capacitor connecting circuit is arranged in the core body and comprises a main circuit and a branch circuit; the two metal inserts are arranged on the head side and the tail side of the core body respectively, the metal insert on the head side is used for being connected with electricity, and the metal insert on the tail side is used for being grounded; the head end of the main circuit is communicated with the metal insert on the head side, and the tail end of the main circuit is isolated from the metal insert on the tail side; and the branch is communicated with the metal insert on the tail side. According to the invention, the voltage-dividing capacitor is ingeniously integrated in the post insulator, and the integrated design significantly reduces the workload of field installation. Compared with a traditional mode that a voltage dividing capacitor needs to be installed outdoors, the problems caused by field installation process difference, environmental factor interference and the like are avoided, the installation cost and the construction difficulty are effectively reduced, and meanwhile the overall stability and reliability of equipment are improved.

Description

Technical Field

[0001] The invention relates to a composite capacitor electronic mutual insulator support insulator and a measuring method. Background Art

[0002] In traditional capacitive voltage transformers, the divider capacitors are typically installed outdoors, where their insulation performance is susceptible to environmental factors. For example, humid weather can degrade insulation performance, affecting measurement accuracy and even causing electrical failures. The divider capacitors are complex to install, requiring on-site installation on capacitor brackets and interfacing with support 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, can lead to poor contact during long-term operation, compromising the stability and reliability of the voltage transformer.

[0003] Conventional transformer post insulators lack an integrated capacitor voltage divider structure, making them unable to meet the modern power system's requirements for miniaturization, integration, and high-performance voltage transformers. As power systems continue to expand and voltage levels increase, traditional transformer post insulators are becoming increasingly difficult to adapt to the complex grid operating environment and high-precision measurement requirements. Summary of the Invention

[0004] The present invention aims to solve the problems existing in the prior art and provides a composite capacitor electronic transformer post insulator and a measurement method.

[0005] The technical solutions adopted in the present invention are:

[0006] A composite capacitor electronic transformer support insulator includes a core body, an shed is arranged outside the core body, and further includes

[0007] A capacitor circuit is placed in the core and includes a main circuit and a branch circuit;

[0008] Metal inserts, two metal inserts are respectively arranged on the head and tail sides of the core body, 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 circuit 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 circuit is connected to the metal insert on the tail side.

[0010] Furthermore, a main capacitor is provided on the main circuit, and a branch capacitor is provided on the branch circuit.

[0011] Furthermore, a first joint is provided on the metal insert at the rear side for connecting to the branch line.

[0012] Furthermore, a second joint is provided at the tail side of the main road.

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

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

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

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

[0017] The present invention also discloses a method for measuring a composite capacitor electronic transformer post insulator, comprising the following steps:

[0018] Main capacitance measurement: Connect the high voltage end of the high voltage bridge to the metal insert on the head side, and connect the low voltage end of the high voltage bridge to the second connector on the tail side of the main circuit, read the capacitance value and record it in pF;

[0019] Capacitance measurement: Connect the high-voltage terminal of the high-voltage bridge to the metal insert on the head side, and connect the low-voltage terminal of the high-voltage bridge to the first connector on the metal insert on the tail side. Read the capacitance value and record it in nF.

[0020] Convert the values ​​of the main capacitor and the sub-capacitor into equal units, and divide the sub-capacitor value by the main capacitor value to get the voltage divider ratio (V out / V in ), the voltage divider ratio calculation formula is:

[0021] ,

[0022] Where 𝐶1 is the main capacitance value and 𝐶2 is the sub-capacitance value;

[0023] The calculated voltage divider ratio is compared with the designed voltage divider ratio. If the actual measured voltage divider ratio and the designed voltage divider ratio are within the allowable error range, it is considered that the performance of the composite capacitor electronic transformer post insulator meets the design requirements; if it exceeds the error range, further analysis of the cause is required and corresponding adjustments must be made.

[0024] The present invention has the following beneficial effects:

[0025] The ingenious integration of the voltage divider capacitor within the post insulator significantly reduces on-site installation workload. Compared to the traditional method of installing the voltage divider capacitor outdoors, this design avoids issues caused by differences in on-site installation processes and environmental factors, effectively reducing installation costs and construction difficulties while improving the overall stability and reliability of the equipment.

[0026] The stainless steel plate installed on the rear end 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 stable connection of each component further enhance the mechanical stability of the equipment, ensuring long-term reliable operation in complex environments.

[0027] Inspection ports are located on the sidewalls of the sheds, facilitating access to the first and second connectors, allowing for connection to external measurement equipment for capacitance and voltage divider ratio measurements. Furthermore, the raised portion at the top of the sheds and the stepped surface of the metal insert on the head create a seal during assembly, effectively preventing moisture ingress. This reduces measurement errors and equipment failure risks caused by internal moisture, lowering maintenance costs and frequency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a cross-sectional view of the present invention.

[0029] Figure 2 This is a structural diagram of the present invention.

[0030] Figure 3 This is the structural diagram of the capacitor circuit.

[0031] Figure 4 This is a partial enlarged view of the upper end face of the insulator. DETAILED DESCRIPTION

[0032] The present invention will be further described below with reference to the accompanying drawings.

[0033] like Figures 1 to 4 The present invention provides a composite capacitor electronic transformer support insulator, comprising a core 1, an shed 2, a capacitor connection line 3 and a metal insert 4. The core 1 serves as the basic supporting structure of the entire insulator and is formed by pouring oil-epoxy resin. The shed 2 is arranged outside the core 1.

[0034] The capacitor circuit 3 is located within the core 1 and includes a main circuit 31 and a branch circuit 32. The main circuit 31 and the branch circuit 32 are equipped with a main capacitor 33 and a branch capacitor 34, respectively, to achieve voltage division measurement. Two metal inserts 4 are located at the head and tail of the core 1, the head side for power connection and the tail side for grounding, providing the necessary electrical connection points for the measurement circuit. The outer wall of the shed 2 is equipped with a shielding ring 5 to shield against external electromagnetic interference and ensure measurement accuracy.

[0035] A stainless steel plate 6 is also provided on the tail side of the core 1 to further enhance the mechanical strength, stability and moisture resistance of the insulator. The stainless steel plate 6 makes the entire bottom surface flat and covers the epoxy completely and seals it with sealant because the epoxy is afraid of moisture.

[0036] A raised portion 21 is provided at the upper end of the shed 2, and the upper end surface of the metal insert 4 on the head side forms a stepped surface, which contacts the assembly surface of the mounting carrier during assembly to form a seal, prevent moisture from entering, and extend the service life of the insulator.

[0037] Two metal inserts 4 are located at the head and tail of the core 1. The metal insert 4 on the head side is used for electrical connection, connecting to the high-voltage power supply and providing high-voltage input for the entire capacitive voltage divider circuit. The metal insert 4 on the tail side is used for grounding, ensuring the safety and stability of the measurement circuit.

[0038] The head end of the main path 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, which ensures the unidirectionality of the high voltage input and avoids the interference of current backflow on the measurement result.

[0039] The branch circuit 32 is connected to the metal insert 4 at the rear end, enabling the sub-capacitor 34 to participate in the capacitive voltage division. A first connector 41 is provided on the metal insert 4 at the rear end, connecting to the branch circuit 32. A second connector 42 is provided at the rear end of the main circuit 31. These two connectors are connected through the detection port 21 on the side wall of the shed 2, facilitating connection to external measurement equipment for capacitance and voltage division ratio measurements.

[0040] The measuring method of the present invention comprises the following steps:

[0041] Main Capacitance Measurement: Connect the high-voltage terminal of the high-voltage bridge to the metal insert 4 on the front side. Connect the low-voltage terminal of the high-voltage bridge to the rear side of the main circuit 31 using the second connector 42. The high-voltage bridge now applies high voltage to the main capacitor 33, causing it to charge and discharge. After the circuit stabilizes, the high-voltage bridge reads the capacitance of the main capacitor 33 and records it in pF.

[0042] Sub-capacitance measurement: Similarly, connect the high-voltage terminal of the high-voltage bridge to the metal insert 4 on the front side. This time, connect the low-voltage terminal of the high-voltage bridge to the metal insert 4 on the rear side using the first connector 41. The high-voltage bridge applies high voltage to the sub-capacitor 34, causing it to charge and discharge. After the circuit stabilizes, the high-voltage bridge reads the capacitance of the sub-capacitor 34 and records it in nF.

[0043] Calculate the voltage divider ratio:

[0044] After converting the values ​​of the main capacitor and the sub-capacitor into the same units, divide the sub-capacitor value by the main capacitor value to get the voltage divider ratio (Vout / Vin). The voltage divider ratio calculation formula is:

[0045] ,

[0046] Among them, 𝐶1 is the main capacitance value and 𝐶2 is the sub-capacitance value.

[0047] Compare the calculated voltage divider ratio with the designed voltage divider ratio. If the actual measured voltage divider ratio and the designed voltage divider ratio are within the allowable error range, the performance of the composite capacitor electronic transformer post insulator is considered to meet the design requirements. If it is outside the error range, further analysis of the cause is required and corresponding adjustments are required.

[0048] The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements can be made without departing from the principles of the present invention. These improvements should also be regarded as the scope of protection of the present invention.

Claims

1. A composite capacitor electronic transformer post insulator, comprising a core (1), wherein an shed (2) is provided outside the core (1), and characterized in that: Also includes A capacitor connection circuit (3), the capacitor connection circuit (3) being disposed in the core (1) and comprising a main circuit (31) and a branch circuit (32); Metal inserts (4), two metal inserts (4) are respectively arranged 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 circuit (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 circuit (32) is connected to the metal insert (4) on the tail side.

2. The composite capacitor electronic transformer post insulator according to claim 1, characterized in that: A main capacitor (33) is provided on the main circuit (31), and a branch capacitor (34) is provided on the branch circuit (32).

3. The composite capacitor electronic transformer post insulator according to claim 1, characterized in that: The metal insert (4) at the rear side is provided with a first connector (41) for connecting to the branch (32).

4. The composite capacitor electronic transformer post insulator according to claim 3, characterized in that: A second connector (42) is provided at the tail side of the main path (31).

5. The composite capacitor electronic transformer post insulator according to claim 4, characterized in that: A detection port (21) for leaking the first joint (41) and the second joint (42) is provided on the side wall of the umbrella skirt (2).

6. The composite capacitor electronic transformer post insulator according to claim 1, characterized in that: The outer wall of the umbrella skirt (2) is provided with a shielding ring (5).

7. The composite capacitor electronic transformer post insulator according to claim 1, characterized in that: A stainless steel plate (6) is also provided on the rear side of the core (1).

8. The composite capacitor electronic transformer post insulator according to claim 1, characterized in that: The upper end of the umbrella skirt (2) is provided with a raised portion (21).

9. A method for measuring a composite capacitor electronic transformer post insulator according to any one of claims 1 to 8, characterized in that: The steps include: Main capacitance measurement: Connect the high voltage end of the high voltage bridge to the metal insert (4) on the head side, and connect the low voltage end of the high voltage bridge to the second connector (42) on the tail side of the main circuit (31), read the capacitance value, and record it in pF; Capacitance measurement: connect the high voltage end of the high voltage bridge to the metal insert (4) on the head side, connect the low voltage end of the high voltage bridge to the first connector (41) on the metal insert (4) on the tail side, read the capacitance value, and record it in nF; Convert the values ​​of the main capacitor and the sub-capacitor into equal units, and divide the sub-capacitor value by the main capacitor value to get the voltage divider ratio (V out / V in ), the voltage divider ratio calculation formula is: ， Where 𝐶1 is the main capacitance value and 𝐶2 is the sub-capacitance value; The calculated voltage divider ratio is compared with the designed voltage divider ratio. If the actual measured voltage divider ratio and the designed voltage divider ratio are within the allowable error range, it is considered that the performance of the composite capacitor electronic transformer post insulator meets the design requirements; if it exceeds the error range, further analysis of the cause is required and corresponding adjustments must be made.

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