Solid-sealed polar pole and recloser

Abstract

The utility model discloses a solid-sealed polar pole and a recloser. The solid-sealed polar pole comprises a shell with a wire inlet side and a wire outlet side, a vacuum ceramic arc extinguish chamber, a current sensor and a voltage sensor, the vacuum ceramic arc extinguish chamber is arranged in the shell; the current sensor and the voltage sensor are both arranged in the shell and are respectively used for detecting the current of the wire inlet side of the shell and the voltage of the wire inlet side and the wire outlet side of the shell; wherein the voltage sensor is a resistive voltage divider. According to the utility model, the voltage sensor is arranged to be the resistance-type voltage divider to replace a capacitance-type voltage divider in the prior art, the service life and the reliability of the product are improved because a resistor does not have the defect of capacitance attenuation, and the insulation performance of the resistance-type voltage divider is not damaged when the resistance-type voltage divider is integrally poured and formed, so that the reliability of the product is improved. Therefore, the purpose of higher environmental interference resistance is achieved, and the purposes of improving the measurement precision and improving the high-voltage line protection effect are achieved.

Description

Technical Field

[0001] The utility model relates to the field of reclosers, in particular to a sealed pole and a recloser. Background Art

[0002] The AC high-voltage automatic recloser, also known as the recloser, is a high-voltage switchgear with self-control and protection functions. It can automatically detect the current passing through the main circuit of the recloser, automatically interrupt the fault current according to the inverse time protection in case of a fault, and reclose multiple times according to the predetermined delay and sequence. In order to meet the needs of distribution network automation, more and more AC high-voltage automatic reclosers with reclosing functions are used in power grids. Once a power system failure occurs in the distribution network, the fault should be quickly determined and isolated in sections to reduce the scope of power outage and restore power supply in time.

[0003] The vacuum recloser has the functions of protecting and monitoring the lines and equipment, and is a remote terminal unit combined with feeder automation. In the prior art, the primary and secondary fusion recloser uses a capacitive voltage divider directly sealed in the recloser pole, and collects the voltage signal of the low-voltage capacitor to monitor the system voltage through the principle of capacitive voltage division. However, this device has certain defects: for example, since the accuracy of the capacitor is easily affected by the ambient temperature, when an integrated casting molding setting is adopted, the temperature during molding will cause a large measurement error, which will in turn bring disadvantages to the protection of high-voltage lines.

[0004] Therefore, a sealed pole and a recloser are needed to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide a sealed pole and a recloser, so as to improve the anti-interference performance against external factors and the measurement accuracy, thereby effectively improving the protection effect on the high-voltage line in the subsequent process.

[0006] In order to solve the above technical problems, the utility model provides a sealed pole, including a shell with an incoming line side and an outgoing line side, a vacuum ceramic arc extinguishing chamber, a current sensor and a voltage sensor;

[0007] The vacuum ceramic arc extinguishing chamber is arranged inside the housing;

[0008] The current sensor and the voltage sensor are both arranged inside the housing, and are used to detect the current on the incoming line side of the housing and the voltage on the incoming line side and the outgoing line side of the housing respectively;

[0009] Wherein, the voltage sensor is a resistive voltage divider.

[0010] Furthermore, the housing is provided with an upper guide rod and an outlet conductive rod on the inlet side and the outlet side respectively;

[0011] One end of the outgoing conductive rod is located inside the shell, and the other end extends to the outside of the shell.

[0012] Further, the voltage sensor includes an incoming line voltage sensor and an outgoing line voltage sensor;

[0013] One end of the incoming line voltage sensor and the outgoing line voltage sensor are respectively connected to the upper guide rod and the outgoing line conductive rod, and the other end extends to the bottom of the shell.

[0014] Further, the incoming voltage sensor includes a first high-voltage sampling resistor, and the outgoing voltage sensor includes a second high-voltage sampling resistor;

[0015] There is a height difference between the first high-voltage sampling resistor and the second high-voltage sampling resistor.

[0016] Furthermore, the second high-voltage sampling resistor is higher than the first high-voltage sampling resistor, and one end of the second high-voltage sampling resistor connected to the outlet conductive rod is located in the same plane as the axis of the outlet side of the shell.

[0017] Furthermore, the current sensor adopts a ring structure, so that the current sensor surrounds the middle part of the outer wall of the outgoing conductive rod.

[0018] Furthermore, a balancing ring is also provided inside the shell;

[0019] The equalizing ring is arranged on the outer wall of the outgoing conductive rod and is located on both sides of the current sensor;

[0020] A non-inductive resistor is also provided inside the housing;

[0021] The non-inductive resistor is connected in parallel to the secondary output terminal of the current sensor.

[0022] Furthermore, the housing, the vacuum ceramic arc-extinguishing chamber, the current sensor and the voltage sensor are integrally cast and formed;

[0023] The shell is made of outdoor epoxy resin material, and the vacuum ceramic arc extinguishing chamber is covered with a silicone rubber sleeve.

[0024] On the other hand, the utility model also provides a recloser, comprising a chassis and a plurality of sealed poles as described in the above embodiments;

[0025] The plurality of sealed poles are fixed on the chassis in rows and at equal intervals.

[0026] Furthermore, the sealed poles are provided with three;

[0027] Wherein, two current sensors are arranged on the outgoing line side of each housing.

[0028] Compared with the prior art, the utility model has at least the following beneficial effects:

[0029] By setting the voltage sensor as a resistive voltage divider to replace the capacitive voltage divider in the prior art, the product life and reliability are improved because the resistor does not have the defect of capacitance attenuation. In addition, because the insulation performance of the resistive voltage divider will not be easily destroyed when it is set in an integrated casting, it achieves the purpose of achieving stronger resistance to environmental interference, thereby achieving the purpose of improving measurement accuracy and improving the protection effect of high-voltage lines.

[0030] Furthermore, the device is provided with a voltage sensor including an incoming line voltage sensor and an outgoing line voltage sensor, and a height difference is formed between the first high-voltage sampling resistor in the incoming line voltage sensor and the second high-voltage sampling resistor in the outgoing line voltage sensor, thereby avoiding the situation in which, during the fracture withstand voltage test, the incoming line voltage sensor and the outgoing line voltage sensor are located in the same plane, resulting in the incoming line sensor being high voltage and the outgoing line sensor being grounded, causing a large potential difference between the incoming line sensor and the outgoing line sensor, thereby affecting the measurement accuracy, thereby further improving the measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a cross-sectional view of a sealed pole in one embodiment of the utility model;

[0032] Figure 2 This is a schematic diagram of the structure of a sealed pole in an embodiment of the utility model;

[0033] Figure 3 This is an electrical schematic diagram of a current sensor with a sealed pole in one embodiment of the utility model;

[0034] Figure 4 This is an electrical schematic diagram of a voltage sensor with a sealed pole in one embodiment of the utility model;

[0035] Figure 5 It is a structural schematic diagram of a recloser in one embodiment of the utility model.

[0036] Figure numbers: 1. Shell; 11. Upper guide rod; 12. Outgoing line conductive rod; 2. Vacuum ceramic arc extinguishing chamber; 3. Current sensor; 4. Incoming line side voltage sensor; 5. Outgoing line side voltage sensor; 6. Equalizing ring; 7. Non-inductive resistor; 8. Chassis. DETAILED DESCRIPTION

[0037] The following will be described in more detail with reference to the schematic diagram of the utility model, wherein the preferred embodiment of the utility model is shown, and it should be understood that the utility model described herein can be modified by a person skilled in the art, while still achieving the advantageous effects of the utility model. Therefore, the following description should be understood as being widely known to a person skilled in the art, and not as a limitation to the utility model.

[0038] The present invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the accompanying drawings are in very simplified form and in non-precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0039] Embodiment 1

[0040] like Figure 1 to Figure 2 As shown, an embodiment of the utility model proposes a sealed pole, which is applied to a 13.8kV recloser, including a shell 1 with an incoming line side and an outgoing line side, a vacuum ceramic arc extinguishing chamber 2, a current sensor 3 and a voltage sensor.

[0041] The vacuum ceramic arc extinguishing chamber 2 is arranged inside the housing 1 .

[0042] The current sensor 3 and the voltage sensor are both arranged inside the housing 1 and are used to detect the current on the incoming side of the housing 1 and the voltage on the incoming side and the outgoing side of the housing 1 respectively.

[0043] Wherein, the voltage sensor is a resistive voltage divider.

[0044] The device replaces the capacitive voltage divider in the prior art by setting the voltage sensor as a resistive voltage divider. Since the resistor does not have the defect of capacitance attenuation, the product life and reliability are improved. In addition, since the insulation performance of the resistive voltage divider will not be easily damaged when it is set in an integrated casting molding, it achieves the purpose of achieving a stronger ability to resist environmental interference, thereby achieving the purpose of improving measurement accuracy and improving the protection effect on high-voltage lines.

[0045] The housing 1 is provided with an upper guide rod 11 and an outgoing conductive rod 12 on the incoming line side and the outgoing line side, respectively.

[0046] One end of the outgoing conductive rod 12 is located inside the housing 1 , and the other end extends to the outside of the housing 1 .

[0047] It should be noted that the sealed pole also includes components such as flexible connection and insulating rod (not shown in the figure). Specifically, the upper guide rod 11 is connected to the static end of the vacuum ceramic arc extinguishing chamber 2, and the moving end 2 of the vacuum ceramic arc extinguishing chamber is connected to the flexible connection moving end. The flexible connection moving end is tightly combined with the moving end of the vacuum arc extinguishing chamber through the tightening force of the insulating rod. The flexible connection is connected to the moving end of the vacuum arc extinguishing chamber and the outgoing conductive rod 12 to form a primary main circuit structure. The secondary circuit structure is formed between the current sensor 3 and the outgoing conductive rod 12, between the voltage sensor and the upper guide rod 11, and between the voltage sensor and the outgoing conductive rod 12. By forming the housing 1, the vacuum ceramic arc extinguishing chamber 2, the current sensor 3 and the voltage sensor as an integrated casting to form a primary and secondary fusion sealed pole, compared with the product with external sensors, this design significantly reduces the overall size of the equipment and improves the installation efficiency.

[0048] The housing 1 is made of outdoor epoxy resin, and the vacuum ceramic arc-extinguishing chamber 2 is covered with a silicone rubber sleeve.

[0049] In this embodiment, the voltage sensor includes an incoming line voltage sensor 4 and an outgoing line voltage sensor 5 .

[0050] One end of the incoming line voltage sensor 4 and the outgoing line voltage sensor 5 are respectively connected to the upper guide rod 11 and the outgoing line conductive rod 12 , and the other ends extend to the bottom of the housing 1 .

[0051] In addition, the incoming voltage sensor 4 includes a first high-voltage sampling resistor, and the outgoing voltage sensor 5 includes a second high-voltage sampling resistor.

[0052] It should also be noted that there is a height difference between the first high-voltage sampling resistor and the second high-voltage sampling resistor, so as to avoid the situation in which, during the fracture withstand voltage test, the incoming voltage sensor 4 and the outgoing voltage sensor 5 are located in the same plane, resulting in the incoming voltage sensor 4 being high voltage and the outgoing voltage sensor 5 being grounded, causing a large potential difference between the incoming voltage sensor 4 and the outgoing voltage sensor 5, thereby affecting the measurement accuracy, thereby further improving the measurement accuracy.

[0053] Specifically, the second high-voltage sampling resistor is higher than the first high-voltage sampling resistor, and one end of the second high-voltage sampling resistor connected to the outgoing conductive rod 12 is located in the same plane as the axis of the outgoing side of the housing 1 (such as Figure 3 The second high-voltage sampling resistor is conveniently connected to the outlet conductive rod 12 located on the outlet side of the housing 1 through the wiring harness, so that the wiring harness is laid horizontally, which is convenient for casting and can effectively reduce the waste of resources.

[0054] It should be particularly pointed out that, in the present embodiment, a support hole is formed at the bottom of the shell 1, and is located directly below the incoming voltage sensor 4 and the outgoing voltage sensor 5, for accommodating a support member (not shown in the figure), that is, when casting is required, the supporting member is provided to support the incoming voltage sensor 4 and the outgoing voltage sensor 5, so that the high-voltage end (i.e., the upper end) of the second high-voltage sampling resistor and the first high-voltage sampling resistor are not at the same height, so as to increase the insulation thickness between the two, thereby achieving the effects of optimizing the electric field, reducing interference, and improving the withstand voltage strength, and being able to be located in the same plane as the axial line of the outgoing side of the shell 1, so as to facilitate the subsequent wiring harness laying and casting.

[0055] By providing the support member, the stability during casting can be effectively improved, and the occurrence of poor measurement results due to misalignment of the incoming voltage sensor 4 and the outgoing voltage sensor 5 can be avoided.

[0056] In a further embodiment, the current sensor 3 adopts an annular structure, so that the current sensor 3 surrounds the middle part of the outer wall of the outgoing conductive rod 12 .

[0057] Among them, an equalizing ring 6 is also provided inside the shell 1. The equalizing ring 6 is arranged on the outer wall of the outgoing conductive rod 12 and is located on both sides of the current sensor 3. The high voltage can be evenly distributed around the object to ensure that there is no potential difference between various parts of the ring, thereby achieving a voltage equalization effect, thereby improving product partial discharge and improving the accuracy of the test results.

[0058] In addition, a non-inductive resistor 7 is provided inside the housing 1 . The non-inductive resistor 7 is connected in parallel to the secondary output terminal of the current sensor 3 to convert a small current signal into a small voltage signal.

[0059] It should be noted that by connecting the non-inductive resistor 7 to the secondary output terminal of the current sensor 3, the overvoltage at the secondary output terminal of the current sensor 3 can be effectively avoided, thereby protecting the electrical equipment and system at the secondary output terminal. At the same time, connecting the resistor on the secondary side of the current transformer can also improve the anti-interference ability of the circuit, reduce the influence of electromagnetic interference and harmonics, and improve the accuracy and stability of the measurement.

[0060] Embodiment 2

[0061] See also Figure 1 as well as Figures 3 to 5 As shown, this embodiment further proposes a recloser based on the first embodiment, including a chassis 8 and a plurality of the sealed poles described in the above embodiments.

[0062] Among them, a plurality of the sealed poles are fixed on the chassis 8 in rows and at equal intervals.

[0063] In this embodiment, three sealed poles are provided, and two current sensors 3 are provided on the outgoing line side of each housing 1 .

[0064] It should be noted that Figure 3 and Figure 4 The symbols referred to in are as follows:

[0065] TA1: A-phase current sensor; AP1: A-phase primary winding incoming line; AP2: A-phase primary winding outgoing line; AS1: A-phase secondary winding; R1: A-phase non-inductive resistor; TB1: B-phase current sensor; BP1: B-phase primary winding incoming line; BP2: B-phase primary winding outgoing line; BS1: B-phase secondary winding; R2: B-phase non-inductive resistor; TC1: C-phase current sensor; CP1: C-phase primary winding incoming line; CP2: C-phase primary winding outgoing line; CS1: C-phase secondary winding; R3: C-phase non-inductive resistor; BN1: zero-sequence secondary winding; R4: zero-sequence non-inductive resistor; Z1a: A-phase primary resistor; Z2a: A-phase secondary resistor; Z1b: B-phase primary resistor; Z2b: B-phase secondary resistor; Z1c: C-phase primary resistor; Z2c: C-phase secondary resistor.

[0066] like Figure 5 As shown, the device has a current sensor 3 and a voltage sensor built inside, and integrates the vacuum ceramic arc extinguishing chamber 2 to achieve an integrated design of the recloser and the intelligent measurement and control terminal, so as to achieve the purpose of information collection and remote control.

[0067] The device achieves the following performance:

[0068] 1. Ambient temperature: -40℃∽+70℃.

[0069] 2. Altitude: 5000m and below.

[0070] 3. There is no obvious dust, smoke, corrosive gas, steam or salt in the ambient air.

[0071] 4. Relative humidity: The average relative humidity measured within 24 hours shall not exceed 95%.

[0072] 5. Rated insulation level: 17.5 / 38 / 95kV, of which the power frequency withstand voltage can reach 60kV / min, reaching the international advanced level.

[0073] 6. Break voltage resistance: 65kV / min at the incoming and outgoing terminals, without discharge or flashover.

[0074] 7. Allow long-term operation at 1.2 times the rated current and voltage.

[0075] 8. Allowed to run at 1.9 times the rated current and voltage for 8 hours.

[0076] This device is proposed for the solid-sealed pole of the 13.8kV recloser based on the primary and secondary fusion design. Since the sensor is integrated inside the solid-sealed pole, it can significantly reduce the overall size of the equipment and improve the installation efficiency compared to products with external sensors. In addition, since a resistive voltage divider is used as a voltage sensor, the insulation performance of the entire device will not be destroyed. Compared with traditional capacitive voltage sensors, it has stronger resistance to environmental interference, improves the practicality of the overall device, and has a better prospect of use.

[0077] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A sealed pole, characterized in that: It includes a shell with an incoming line side and an outgoing line side, a vacuum ceramic arc extinguishing chamber, a current sensor and a voltage sensor; The vacuum ceramic arc extinguishing chamber is arranged inside the housing; The current sensor and the voltage sensor are both arranged inside the housing, and are used to detect the current on the incoming line side of the housing and the voltage on the incoming line side and the outgoing line side of the housing respectively; Wherein, the voltage sensor is a resistive voltage divider.

2. The sealed pole according to claim 1, characterized in that: The housing is provided with an upper guide rod and an outlet conductive rod on the inlet side and the outlet side respectively; One end of the outgoing conductive rod is located inside the shell, and the other end extends to the outside of the shell.

3. The sealed pole according to claim 2, characterized in that: The voltage sensor includes an incoming line voltage sensor and an outgoing line voltage sensor; One end of the incoming line voltage sensor and the outgoing line voltage sensor are respectively connected to the upper guide rod and the outgoing line conductive rod, and the other end extends to the bottom of the shell.

4. The sealed pole according to claim 3, characterized in that: The incoming voltage sensor includes a first high-voltage sampling resistor, and the outgoing voltage sensor includes a second high-voltage sampling resistor; There is a height difference between the first high-voltage sampling resistor and the second high-voltage sampling resistor.

5. The sealed pole according to claim 4, characterized in that: The second high-voltage sampling resistor is higher than the first high-voltage sampling resistor, and one end of the second high-voltage sampling resistor connected to the outlet conductive rod is located in the same plane as the axis of the outlet side of the housing.

6. The sealed pole according to claim 2, characterized in that: The current sensor adopts a ring structure, so that the current sensor surrounds the middle part of the outer wall of the outgoing line conductive rod.

7. The sealed pole according to claim 6, characterized in that: A balancing ring is also provided inside the shell; The equalizing ring is arranged on the outer wall of the outgoing conductive rod and is located on both sides of the current sensor; A non-inductive resistor is also provided inside the housing; The non-inductive resistor is connected in parallel to the secondary output terminal of the current sensor.

8. The sealed pole according to claim 1, characterized in that: The housing, the vacuum ceramic arc-extinguishing chamber, the current sensor and the voltage sensor are integrally cast and formed; The shell is made of outdoor epoxy resin material, and the vacuum ceramic arc extinguishing chamber is covered with a silicone rubber sleeve.

9. A recloser, characterized in that: It comprises a chassis and a plurality of sealed poles as claimed in any one of claims 1 to 8; The plurality of sealed poles are fixed on the chassis in rows and at equal intervals.

10. The recloser according to claim 9, characterized in that: The sealed poles are provided with three; Wherein, two current sensors are arranged on the outgoing line side of each housing.

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