A pole-mounted switch with integrated coupler and current sensor

Abstract

The utility model relates to the technical field of circuit breaker, especially to a pole switch with integrated coupler and current sensor, including current sensor, signal coupler and 10KV pole circuit breaker, current sensor and signal coupler are integrated into 10KV pole circuit breaker, 10KV pole circuit breaker obtains A phase current from high voltage line, and current sensor is used for gathering A phase current, and signal coupler is used for signal bidirectional transmission. The utility model effectively reduces the equipment volume and installation space, simplifies wiring, reduces cost, and reduces the risk of poor contact and signal interference caused by environmental factors.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, and in particular to a pole-mounted switch with an integrated coupler and current sensor. Background Technology

[0002] Pole-mounted switches (pole-mounted circuit breakers) are key equipment used for line protection and control in power distribution networks. Traditional designs typically only have basic current measurement and breaking functions. With the development of smart grids, the functional requirements for circuit breakers are increasing, especially the need to support remote communication (such as carrier communication) to achieve status monitoring, fault location, and remote control.

[0003] Existing technologies suffer from the following significant drawbacks: Functional separation leads to size and cost issues. In traditional solutions, the current sensor (for power frequency current sampling) and the high-frequency communication coupler (for carrier signal transmission) are independent devices. They must be installed separately on pole-mounted circuit breakers or power lines, occupying significant space and involving complex wiring, increasing equipment size and installation costs. Traditional current sensors (such as current transformers) can only output power frequency current signals and cannot transmit high-frequency communication signals (such as carrier signals or high-frequency data for other purposes), limiting the intelligent upgrade of circuit breakers. The physically separated coupler and current sensor make their connection interface susceptible to environmental factors (such as humidity and vibration), leading to poor contact or signal interference, reducing long-term system reliability. Without effective isolation measures, high-frequency communication signals may crosstalk into the current sampling circuit, affecting the accuracy of power frequency current measurement; conversely, strong power frequency currents may also damage the high-frequency circuitry of the coupler. Utility Model Content

[0004] This invention provides a pole-mounted switch with an integrated coupler and current sensor, which effectively reduces the size of the equipment and installation space, simplifies wiring, lowers costs, and reduces the risk of poor contact and signal interference caused by environmental factors.

[0005] To achieve the purpose of this utility model, the technical solution adopted is: a pole-mounted switch with an integrated coupler and a current sensor, including a current sensor, a signal coupler and a 10KV pole-mounted circuit breaker. The current sensor and the signal coupler are integrated into the 10KV pole-mounted circuit breaker. The 10KV pole-mounted circuit breaker obtains the A-phase current from the high-voltage line. The current sensor is used to collect the A-phase current, and the signal coupler is used for bidirectional signal transmission.

[0006] As an optimized solution of this utility model, the current sensor includes a current transformer TA and a sampling resistor RA. The current transformer TA reduces the A-phase current IA in the high-voltage line to a small secondary current, and the sampling resistor RA converts the small secondary current into a voltage signal output.

[0007] As an optimized solution of this utility model, the signal coupler includes a coupling transformer Tn, a low-voltage side coupling capacitor CL, and a high-voltage side coupling capacitor CH. The high-voltage side high-frequency signal is blocked by the high-voltage side coupling capacitor CH and then enters the primary coil of the coupling transformer Tn for coupling to the secondary side. After the DC is filtered out by the low-voltage side coupling capacitor CL, it is sent to the Po port. The low-voltage side high-frequency signal is blocked by the low-voltage side coupling capacitor CL and then enters the secondary coil of the coupling transformer Tn for electromagnetic coupling to the primary side. After the DC is blocked by the high-voltage side coupling capacitor CH, it is injected into the Pi port.

[0008] As an optimized solution of this utility model, the current sensor also includes a low-pass filter, which is connected in parallel across the sampling resistor RA.

[0009] As an optimized solution of this utility model, the pole-mounted switch with integrated coupler and current sensor also includes a high-pass filter. The input terminal of the high-pass filter is connected in parallel across the two ends of the sampling resistor RA, and the output terminal of the high-pass filter is connected to the primary coil of the coupling transformer Tn.

[0010] This invention has the following positive effects: 1) By integrating the current sensor and high-frequency communication coupler into a 10KV pole-mounted circuit breaker, this invention achieves device integration. This not only reduces the space required for independent installation but also simplifies the wiring process, reducing the overall size and installation cost of the device. Furthermore, the integrated design reduces physical connection points, lowering the risk of poor contact or signal interference due to environmental factors (such as humidity and vibration).

[0011] 2) This invention improves long-term reliability and measurement accuracy: In traditional solutions, the current sensor and communication coupler are separate, making the system susceptible to external environmental influences, leading to unreliability or inaccurate measurements. This invention, however, uses a low-pass filter to isolate high-frequency signals to ensure the current sensor operates normally, and a high-pass filter to ensure the signal coupler operates normally. This effectively prevents crosstalk from high-frequency communication signals to the current sampling circuit and damage to the coupler from strong power frequency current, thus improving the long-term reliability of the system and the accuracy of current measurement.

[0012] 3) This utility model not only retains the basic functions of a general circuit breaker, but also adds carrier communication capabilities, enabling it to support intelligent needs such as remote communication, status monitoring, fault location, and remote control. This gives the traditional pole-mounted circuit breaker the ability to transmit high-frequency signals for other purposes, greatly enhancing its applicability in smart grids.

[0013] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained by means of the structures particularly pointed out in the description and the drawings. Attached Figure Description

[0014] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0015] Figure 1 This is a schematic diagram illustrating the principle of this utility model;

[0016] The components include: 1. Current sensor, 2. Signal coupler, and 3. 10KV pole-mounted circuit breaker. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0018] like Figure 1 As shown, this utility model discloses a pole-mounted switch with an integrated coupler and a current sensor, including a current sensor 1, a signal coupler 2 and a 10KV pole-mounted circuit breaker 3. The current sensor 1 and the signal coupler 2 are integrated into the 10KV pole-mounted circuit breaker 3. The 10KV pole-mounted circuit breaker 3 obtains the A-phase current from the high-voltage line. The current sensor 1 is used to collect the A-phase current, and the signal coupler 2 is used for bidirectional signal transmission.

[0019] Current sensor 1 includes a current transformer TA and a sampling resistor RA. The current transformer TA reduces the phase A current IA in the high-voltage line to a small secondary current, and the sampling resistor RA converts the small secondary current into a voltage signal output. IA represents the phase A current, IA+ is the positive polarity output of the current sampling (i.e., the voltage drop across RA of the secondary current IA+), and Icom is the common terminal for current sampling. Assuming the turns ratio of the current transformer TA is n, then:

[0020] Signal coupler 2 includes a coupling transformer Tn, a low-voltage side coupling capacitor CL, and a high-voltage side coupling capacitor CH. High-frequency signals from the high-voltage side are blocked from the power frequency by the high-voltage side coupling capacitor CH and then enter the primary coil of the coupling transformer Tn, where they are coupled to the secondary winding. The DC signal is then filtered out by the low-voltage side coupling capacitor CL and transmitted to port Po. Similarly, high-frequency signals from the low-voltage side are filtered out from the DC frequency by the low-voltage side coupling capacitor CL, enter the secondary coil of the coupling transformer Tn, are electromagnetically coupled to the primary winding, and are then blocked from the power frequency by the high-voltage side coupling capacitor CH before being injected into port Pi. The coupling transformer Tn features bidirectional signal transmission and a wide signal transmission frequency range.

[0021] The current sensor 1 also includes a low-pass filter, which is connected in parallel across the sampling resistor RA. The low-pass filter isolates high-frequency signals, ensuring the normal operation of the current sensor 1. A high-pass filter is also added to ensure the normal operation of the coupler.

[0022] The pole-mounted switch with integrated coupler and current sensor also includes a high-pass filter. The input of the high-pass filter is connected in parallel across the sampling resistor RA, and the output of the high-pass filter is connected to the primary winding of the coupling transformer Tn. The high-pass filter ensures the normal operation of signal coupler 2.

[0023] IA+ is the output terminal of phase A current sensor, and Icom is the common terminal of current sensor. Icom is connected to ground. Pi / Po is the signal transmission port of signal coupler 2. Signal transmission port (Pi / Po): connects to external communication equipment and supports bidirectional signal transmission.

[0024] A pole-mounted switch with an integrated coupler and current sensor not only possesses the functions of a general circuit breaker but also features carrier communication capabilities and the ability to transmit high-frequency signals for other applications. Traditional current sensors only have current signal acquisition capabilities. Integrating the high-frequency communication coupler and current sensor into one unit not only increases the communication functionality of the traditional current transformer but also reduces the size of the two separate devices, offering advantages such as simple installation, low cost, and reliable operation.

[0025] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A pole-mounted switch with an integrated coupler and current sensor, characterized in that: The device includes a current sensor (1), a signal coupler (2), and a 10KV pole-mounted circuit breaker (3). The current sensor (1) and the signal coupler (2) are integrated into the 10KV pole-mounted circuit breaker (3). The 10KV pole-mounted circuit breaker (3) obtains the phase A current from the high-voltage line. The current sensor (1) is used to collect the phase A current, and the signal coupler (2) is used for bidirectional signal transmission.

2. A pole-mounted switch with integrated coupler and current sensor according to claim 1, characterized in that: The current sensor (1) includes a current transformer TA and a sampling resistor RA. The current transformer TA reduces the A-phase current IA in the high-voltage line to a small secondary current, and the sampling resistor RA converts the small secondary current into a voltage signal output.

3. A pole-mounted switch with integral coupler and current sensor according to claim 2, characterized in that: The signal coupler (2) includes a coupling transformer Tn, a low-voltage side coupling capacitor CL and a high-voltage side coupling capacitor CH. The high-voltage side high-frequency signal is blocked by the high-voltage side coupling capacitor CH and then enters the primary coil of the coupling transformer Tn and is coupled to the secondary side. The DC is filtered out by the low-voltage side coupling capacitor CL and then sent to the Po port. The high-frequency signal on the low-voltage side is filtered by the low-voltage side coupling capacitor CL to remove DC, and then electromagnetically coupled to the primary winding of the coupling transformer Tn. After being blocked by the power frequency by the high-voltage side coupling capacitor CH, it is injected into the Pi port.

4. A pole-mounted switch with integral coupler and current sensor according to claim 3, characterized in that: The current sensor (1) also includes a low-pass filter, which is connected in parallel across the sampling resistor RA.

5. A pole-mounted switch with integral coupler and current sensor according to claim 4, characterized in that: The pole-mounted switch with integrated coupler and current sensor also includes a high-pass filter. The input of the high-pass filter is connected in parallel across the sampling resistor RA, and the output of the high-pass filter is connected to the primary coil of the coupling transformer Tn.

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