Anti-creeping current transformer
By using a combined design of a tapered kit and a zero-sequence current sensor in the current transformer, the problem of leakage in the current transformer is solved, achieving higher safety and stability.
Patent Information
- Application Number
- CN202421208610.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-30
- Publication Date
- 2025-05-23
- Estimated Expiration
- 2034-05-30
AI Technical Summary
When used in high-voltage lines, current transformers are prone to leakage due to humidity in the environment, aging of insulation materials or damage to equipment, and the wiring terminals are easily affected by bad weather or birds during installation, resulting in leakage or short circuit.
A leakage-proof current transformer is designed, and a tapered kit is fixed at the connection between the wire and the transmission terminal and the ground terminal. It combines a zero-sequence current sensor and circuit breaker switch to achieve rapid detection and cutting of leakage current.
Through the sealing design of the tapered kit and the real-time detection of the zero-sequence current sensor, the occurrence of leakage is effectively prevented, and the safety and stability of the current transformer is improved.
Smart Images
Figure CN222896209U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of current transformers, in particular to a leakage-proof current transformer. Background Art
[0002] As an electrical measuring device in the power system, the current transformer converts high current into low current through the primary side through the principle of electromagnetic induction, and uses the secondary side to realize electrical measurement, thereby realizing power quality detection of high-voltage lines.
[0003] When a current transformer is used in a high-voltage line, it needs to be connected in series in the current line to be measured. Its installation environment has an important impact on the stability of its performance and the accuracy of secondary current detection. Due to reasons such as humid environment, aging of insulating materials, and equipment damage, leakage may occur in the line or equipment. Part of the current may flow back to the current transformer through an unexpected path, causing leakage in the housing of the current transformer equipment. In addition, when the current transformer is actually installed, it is generally suspended in the high-voltage line or fixed on the pole mounting bracket. Its terminal is often exposed to the air. It is easy to cause the terminal to be connected due to bad weather or birds, which in turn causes leakage or short circuit of the current transformer, causing damage to the terminal equipment at the secondary output end of the current transformer. Utility Model Content
[0004] In order to solve the above-mentioned problems, the utility model provides an anti-leakage current transformer, comprising a current transformer body, on which a transmission terminal and a grounding terminal are arranged, and also comprising a conical kit, a zero-sequence current sensor and a circuit breaker switch, wherein the conical kit is used to be inserted into a conductor and fixedly installed on the outer side of the transmission terminal and the grounding terminal, the transmission terminal and the grounding terminal are electrically connected to the circuit breaker switch through a conductor, the zero-sequence current sensor is connected in series to the grounding terminal conductor, and the zero-sequence current sensor is electrically connected to the circuit breaker switch; the conical kit comprises a conical sleeve, and the front and rear ends of the conical sleeve are respectively provided with an inlet and an outlet, and a sealing umbrella ring is arranged on the inner wall of the conical sleeve, and the sealing umbrella ring is inclined toward the inlet in an initial state.
[0005] The outlet of the conical kit is provided with a sealing ring, and the diameter of the sealing ring is larger than the diameter of the power transmission terminal.
[0006] As a specific implementation, a waterproof rubber strip is circumferentially arranged at the bottom of the sealing ring.
[0007] The diameter of the outlet of the cone kit is larger than the diameter of the inlet.
[0008] In order to facilitate the cone kit to bend freely along with the wire during installation, the cone kit is made of flexible silicone material.
[0009] In order to prevent water and moisture from invading the interior of the conical sleeve, multiple layers of sealing umbrella rings are arranged on the inner wall of the conical sleeve.
[0010] Furthermore, in order to achieve tight fixation between the inside of the conical sleeve and the conductor, the sealing umbrella ring on the same layer is interference fit with the conductor.
[0011] The beneficial effect is that the utility model is a leakage-proof current transformer, which uses a conical set to be fixed at the connection between the conductor and the transmission terminal and the grounding terminal to achieve insulation and protection; and a sealing umbrella ring is arranged on the inner wall of the conical set, and the inserted conductor is tightly fixed by the sealing umbrella ring, and a multi-layer sealing umbrella ring design is adopted, and the same layer of sealing umbrella rings and the conductor are interference-fitted, which can more effectively prevent the conductor from sliding or moving in the conical sleeve. It also prevents water and moisture from entering the interior of the conical set, further improving the leakage-proof performance.
[0012] The zero-sequence current sensor is used to detect the electrical signal of the conductor at the grounding terminal. When used in conjunction with the circuit breaker switch, rapid detection and cutting of leakage current can be achieved, effectively improving the safety and stability of the current transformer. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 Wiring diagram for leakage current transformer;
[0014] Figure 2 is a cross-sectional view of the tapered kit;
[0015] 1. Current transformer body; 2. Circuit breaker switch; 3. Conical kit; 4. Conical sleeve; 5. Sealing umbrella ring; 6. Sealing ring. DETAILED DESCRIPTION
[0016] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings.
[0017] See also Figure 1 This embodiment provides an anti-leakage current transformer, including a current transformer body 1, wherein the current transformer body 1 is provided with a through hole for being connected in series to a high-voltage line to sense the high current of the high-voltage line, and a primary winding and a secondary winding are provided inside the current transformer body 1, and the primary winding converts the high current into a low current through the mutual inductance principle and outputs it through the secondary winding. In order to enable the low current output by the current transformer body 1 to be collected by the substation terminal, a transmission terminal and a grounding terminal are provided on the current transformer body 1, and wires are connected to the transmission terminal and the grounding terminal respectively to transmit the low current signal of the current transformer.
[0018] At the same time, in order to prevent the transmission terminal from leaking or short-circuiting due to external environmental factors when the current transformer body 1 is transmitting low current signals, thereby affecting the electrical detection of the secondary side electrical signal, the anti-leakage current transformer also includes a conical kit 3, a zero-sequence current sensor and a circuit breaker switch 2. The conical kit 3 is used to insert the wire and then be fixedly installed on the outside of the transmission terminal and the grounding terminal, which can seal the connection between the wire and the terminal to prevent rainwater from intruding or foreign objects from contacting the terminal. In addition, in order to achieve the ability to change the direction at will when the wire is connected to the terminal, the conical kit 3 is made of flexible silicone material as a whole, which is convenient for bending with the wire after installation. During the electrical detection and use of the current transformer body 1, the transmission terminal and the grounding terminal are electrically connected to the circuit breaker switch 2 through the wire, and the circuit breaker switch 2 is electrically connected to the substation terminal. The zero-sequence current sensor is connected in series to the grounding terminal conductor, and its output end is electrically connected to the circuit breaker switch 2. The zero-sequence current sensor is used to detect the current signal of the grounding terminal conductor. If no leakage occurs, the current signal of the grounding terminal is zero; if the zero-sequence current sensor detects that the current signal of the grounding terminal conductor is not zero, an induced current is generated and transmitted to the circuit breaker switch 2, and the induced current acts on the magnetic control coil inside the circuit breaker switch 2 to generate a magnetic field, triggering the release to trip the circuit breaker switch 2, and performing a power-off process on the current transformer body 1, thereby effectively avoiding instability in the secondary side current detection of the current transformer body 1.
[0019] like Figure 2 As shown, the conical sleeve 3 includes a conical sleeve 4, and the front and rear ends of the conical sleeve 4 are respectively provided with an inlet and an outlet, and the diameter of the inlet is smaller than the diameter of the outlet; the outlet of the conical sleeve 4 is provided with a sealing ring 6, and the diameter of the sealing ring 6 is larger than the diameter of the transmission terminal. When the terminal of the current transformer body 1 is connected, the wire is first inserted through the inlet, passed out from the outlet, and then connected to the transmission terminal and the grounding terminal respectively. After the connection is completed, the conical sleeve 3 is moved to the connection between the wire and the terminal to seal it. A waterproof rubber strip is circumferentially provided at the bottom of the sealing ring 6, which can be connected to the current transformer body 1 by adhesion.
[0020] In order to prevent water droplets or moisture from entering the wire inlet of the conical sleeve 4, a sealing umbrella ring 5 is provided on the inner wall of the conical sleeve 4. The sealing umbrella ring 5 is tilted toward the wire inlet in the initial state, and the sealing umbrella ring 5 is also made of flexible silicone material. When the wire is inserted into the wire inlet, the sealing umbrella ring 5 will gradually tilt toward the wire outlet as the wire moves; when the wire is connected to the terminal and no longer inserted, the conical sleeve 3 is moved toward the terminal connection, and the sealing umbrella ring 5 is affected by the friction force to return to the initial direction.
[0021] As a preferred embodiment, a multi-layer sealing umbrella ring 5 is provided on the inner wall of the conical sleeve 4, which can realize multi-level blocking inside the conical sleeve 3; and in order to prevent a gap from being left between the inside of the conical sleeve 4 and the inserted wire, the sealing umbrella ring 5 on the same layer has an interference fit with the wire, so that it can fit tightly when fixed.
Claims
1. A leakage-proof current transformer, comprising a current transformer body (1), wherein the current transformer body (1) is provided with a power transmission terminal and a grounding terminal, characterized in that: It also includes a cone-shaped set (3), a zero-sequence current sensor and a circuit breaker switch (2), wherein the cone-shaped set (3) is used to be inserted into a conductor and fixedly installed on the outside of a power transmission terminal and a grounding terminal, the power transmission terminal and the grounding terminal are electrically connected to the circuit breaker switch (2) through a conductor, the zero-sequence current sensor is connected in series to the grounding terminal conductor, and the zero-sequence current sensor is electrically connected to the circuit breaker switch (2); The conical sleeve (3) comprises a conical sleeve (4), wherein a line inlet and a line outlet are respectively arranged at the front and rear ends of the conical sleeve (4), and a sealing umbrella ring (5) is arranged on the inner wall of the conical sleeve (4), wherein the sealing umbrella ring (5) is inclined toward the line inlet in an initial state.
2. The leakage-proof current transformer according to claim 1, characterized in that: The outlet of the conical sleeve (3) is provided with a sealing ring (6), and the diameter of the sealing ring (6) is greater than the diameter of the power transmission terminal.
3. The leakage-proof current transformer according to claim 2, characterized in that: The diameter of the wire outlet of the conical sleeve (3) is larger than the diameter of the wire inlet.
4. The leakage-proof current transformer according to claim 1, characterized in that: The conical sleeve (3) is made of flexible silicone material.
5. The leakage-proof current transformer according to claim 1, characterized in that: A multi-layer sealing umbrella ring (5) is arranged on the inner wall of the conical pipe sleeve (4).
6. The leakage-proof current transformer according to claim 5, characterized in that: The sealing umbrella ring (5) is interference fit with the conductor.
7. The leakage-proof current transformer according to claim 2, characterized in that: A waterproof rubber strip is arranged circumferentially on the bottom of the sealing ring (6).