CN213181744U - Ring main unit voltage sensor structure - Google Patents
Ring main unit voltage sensor structure Download PDFInfo
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- CN213181744U CN213181744U CN202022049003.8U CN202022049003U CN213181744U CN 213181744 U CN213181744 U CN 213181744U CN 202022049003 U CN202022049003 U CN 202022049003U CN 213181744 U CN213181744 U CN 213181744U
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Abstract
The utility model discloses a looped netowrk cabinet voltage sensor structure, including input binding post, insulator, the metal cavity that connects gradually, be formed with the high pressure cavity in the insulator, be provided with high-voltage capacitor in the high pressure cavity, be formed with the low pressure cavity in the metal cavity, be provided with the sample in the low pressure cavity and get the ability module, high-voltage capacitor's one end with input binding post is connected, the other end with sample get can the module and be connected; the sampling energy-taking module comprises a sampling partial pressure capacitor group, an energy-taking main capacitor group, an energy-taking partial pressure capacitor group, a sampling partial pressure mutual inductor, a transformer and an energy-taking partial pressure mutual inductor, wherein the sampling partial pressure capacitor group, the energy-taking main capacitor group and the energy-taking partial pressure capacitor group are connected after being connected in sequence. One product can provide two high-precision sampling signals and enough working power supplies at the same time, the cost of the product is reduced, the size is small, the weight is light, and the installation is convenient.
Description
Technical Field
The utility model relates to measurement energy-taking equipment technical field, concretely relates to looped netowrk cabinet voltage sensor structure.
Background
The ring main unit needs to sample a high-voltage signal for voltage measurement and electric quantity measurement and protection. At the same time, it is meaningful that the acquired signals must be processed subsequently, which requires the use of a working power supply. The current solutions for providing both the sampling signal and the working power supply include the following: the traditional electromagnetic voltage sensor is generally adopted, but the traditional electromagnetic voltage sensor has the defects of large volume, heavy weight, ferromagnetic resonance and the like, and is inconvenient to install; there are also solutions that use a separate electronic voltage transformer plus an external power supply (either a traditional power-take PT or an electronic power-take PT). However, the energy-taking power supply adopting the two schemes has the problem that the power supply cannot be installed due to the narrow space of the ring main unit.
In addition, a sampling unit is added on the basis of the electronic energy-taking voltage transformer, the problem that the two schemes cannot be installed in many occasions can be solved, however, sampling signals fluctuate along with fluctuation of loads connected with a working power supply, the precision of the sampling signals cannot be guaranteed, and the sampling units cannot be used in application occasions with requirements on measurement precision.
Disclosure of Invention
The utility model aims at providing a looped netowrk cabinet voltage sensor structure, can provide two way sampling signal and working power supply simultaneously, the sampling precision is high, simple structure, installation compactness and stable performance are reliable, long service life.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a looped netowrk cabinet voltage sensor structure which the key lies in: the energy sampling device comprises an input wiring terminal, an insulator and a metal cavity which are sequentially connected, wherein a high-voltage cavity is formed in the insulator, a high-voltage capacitor is arranged in the high-voltage cavity, a low-voltage cavity is formed in the metal cavity, a sampling energy-taking module is arranged in the low-voltage cavity, one end of the high-voltage capacitor is connected with the input wiring terminal, and the other end of the high-voltage capacitor is connected with the sampling energy-taking module;
the sampling energy-taking module comprises a sampling partial pressure capacitor group, an energy-taking main capacitor group, an energy-taking partial pressure capacitor group, a sampling partial pressure transformer, a transformer and an energy-taking partial pressure transformer, wherein the sampling partial pressure capacitor group, the energy-taking main capacitor group and the energy-taking partial pressure capacitor group are connected between the high-voltage capacitor and the metal cavity after being connected in sequence, an input winding of the sampling partial pressure transformer is connected at two ends of the sampling partial pressure capacitor group, an input winding of the energy-taking partial pressure transformer is connected at two ends of the energy-taking partial pressure capacitor group, a first output winding of the sampling partial pressure capacitor group is connected to a first signal output line after being connected in series with a first output winding of the energy-taking partial pressure capacitor group, a second output winding of the sampling partial pressure capacitor group is connected in series with a second output winding of the energy-taking partial pressure capacitor group to a second signal output line, one end of a primary coil of the transformer is connected between the sampling partial, the other end of the transformer is connected between the energy-taking voltage-dividing capacitor bank and the metal cavity, and a secondary coil of the transformer is connected with a working power supply output line.
Furthermore, a shielding layer is arranged on the lower portion of the insulator, and the upper end of the metal cavity is covered on the shielding layer.
Furthermore, the bottom of the metal cavity is connected with an output wiring terminal, and the first signal output line, the second signal output line and the working power supply output line are arranged in the output wiring terminal in a penetrating mode.
Furthermore, a grounding terminal is formed beside the metal cavity and electrically connected with the energy-taking voltage-dividing capacitor set.
Furthermore, the turn ratio of the input winding of the sampling voltage-dividing transformer to the first output winding thereof is consistent with the turn ratio of the input winding of the energy-taking voltage divider to the first output winding thereof, and the turn ratio of the input winding of the sampling voltage-dividing transformer to the second output winding thereof is consistent with the turn ratio of the input winding of the energy-taking voltage divider to the second output winding thereof.
Further, an alternating current-direct current conversion circuit and an overvoltage protection circuit are connected between the secondary coil of the transformer and the working power supply output line.
Furthermore, an impedance matching circuit is connected to the positive input end of the input winding of the energy-taking voltage division transformer.
The utility model discloses a show the effect and be:
1. one product can provide two high-precision sampling signals and enough working power supplies at the same time, more than two products in the existing scheme can be replaced, and the cost of the product is reduced.
2. The device has small volume and simple structure, and is particularly suitable for voltage detection or measurement transformation of the ring main unit.
3. Light weight and convenient installation. Need not to go out to move large-scale hoisting equipment, will effectively practice thrift installation construction cost and manual work.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
fig. 2 is a schematic circuit diagram of the present invention.
Detailed Description
The following provides a more detailed description of the embodiments and the operation of the present invention with reference to the accompanying drawings.
As shown in fig. 1, a ring main unit voltage sensor structure includes an input connection terminal 1, an insulator 2, and a metal cavity 6, which are connected in sequence, wherein a high-voltage cavity 3 is formed in the insulator 2, a high-voltage capacitor 4 is arranged in the high-voltage cavity 3, a low-voltage cavity 7 is formed in the metal cavity 6, a sampling energy-taking module 9 capable of outputting two sampling signals and one working power supply is arranged in the low-voltage cavity 7, one end of the high-voltage capacitor 4 is connected with the input connection terminal 1, and the other end is connected with the sampling energy-taking module 9; the lower part of insulator 2 still is provided with shielding layer 5, just the upper end cladding of metal cavity 6 is on this shielding layer 5, the bottom of metal cavity 6 is connected with output binding post 10, the output line of getting to be able to the sample module 9 is connected with two output cables that wear to locate in this output binding post 10, and an output working power supply, another two way voltage sampling signal of output metal cavity 6's side is formed with ground terminal 8, this ground terminal 8 with the sample is got to the module 9 and is connected.
In particular, the insulating high-pressure chamber 3 is glued to the metallic low-pressure chamber 7. The high-voltage chamber 3 is used for installing the high-voltage capacitor 4, and the high-voltage chamber 3 is encapsulated under the vacuum condition after the high-voltage capacitor 4 is installed. The low-pressure chamber 7 is used for installing the sampling energy-taking module 9, and the low-pressure chamber 7 is filled and sealed under normal pressure after the sampling energy-taking module 9 is installed.
Referring to the attached drawing 2, the sampling energy-taking module 9 includes a sampling voltage-dividing capacitor bank, an energy-taking main capacitor bank, an energy-taking voltage-dividing capacitor bank, a sampling voltage-dividing transformer, a transformer and an energy-taking voltage-dividing transformer, the sampling voltage-dividing capacitor bank, the energy-taking main capacitor bank and the energy-taking voltage-dividing capacitor bank are connected in sequence and then connected between the high-voltage capacitor 4 and the metal cavity 6, an input winding of the sampling voltage-dividing transformer is connected at two ends of the sampling voltage-dividing capacitor bank, an input winding of the energy-taking voltage-dividing transformer is connected at two ends of the energy-taking voltage-dividing capacitor bank, a first output winding of the sampling voltage-dividing capacitor bank is connected in series with a first output winding of the energy-taking voltage-dividing capacitor bank and then connected to a first signal output line, a second output winding of the sampling voltage-dividing capacitor bank is connected in series, the one end of the primary coil of transformer is connected sample partial pressure electric capacity group with get between the ability main capacitor group, the other end is connected get can between partial pressure electric capacity group and the metal cavity 6, the secondary coil of transformer is connected with the working power supply output line, first signal output line, second signal output line, working power supply output line and wear to locate two output cable in the output binding post 10 and correspond and be connected, and one of them is working power supply output line 10a, and another is two way voltage sampling signal output line 10 b.
Preferably, the capacitance value ratio between the high-voltage capacitor and the sampling voltage-dividing capacitor bank is consistent with the capacitance value ratio between the energy-taking main capacitor bank and the energy-taking voltage-dividing capacitor bank. The turn ratio of the input winding of the sampling voltage division transformer to the first output winding thereof is consistent with the turn ratio of the input winding of the energy-taking voltage divider to the first output winding thereof, and the turn ratio of the input winding of the sampling voltage division transformer to the second output winding thereof is consistent with the turn ratio of the input winding of the energy-taking voltage divider to the second output winding thereof.
Specifically, the high-voltage capacitor 4 adopts a capacitor with withstand voltage larger than 10kV or is formed by connecting a plurality of capacitors in series; the sampling voltage-dividing capacitor group adopts a group of low-voltage CBB capacitors which are connected in parallel and have withstand voltage of more than 400V, the capacitance value of the low-voltage CBB capacitors is fixed (for example, 100 times) with the capacitance value ratio (Kc) of the high-voltage capacitor 4, and the error requirement is less than 0.05 percent; the energy-taking main capacitor group is formed by connecting a plurality of low-voltage CBB capacitors with withstand voltage of more than 400V in series, the ratio of the capacitance value of the energy-taking main capacitor group to the capacitance value of the high-voltage capacitor 4 is Kqc fixed (for example, 10 times), and the error requirement is less than 5%; the energy taking and voltage dividing capacitor group is a group of low-voltage CBB capacitors which are connected in parallel and have withstand voltage of more than 50V, the capacitance value proportion of the energy taking and voltage dividing capacitor group is consistent with that of the sampling and voltage dividing capacitor group and the high-voltage capacitor 4, and the error requirement is less than 0.05%. The sampling voltage-dividing transformer and the energy-taking voltage-dividing transformer both adopt high-precision transformers which are provided with two output windings and have completely consistent primary and secondary turn ratios.
Preferably, an ac-dc conversion circuit and an overvoltage protection circuit are further connected between the secondary coil of the transformer and the output line of the working power supply to output a stable and reliable dc working power supply.
In this example, an impedance matching circuit is connected to a forward input end of an input winding of the energy-obtaining voltage-dividing transformer, and is used for matching a difference between two voltage-dividing capacitor groups and the transformer to improve output accuracy.
The sensor structure described in this example can adjust the specific structure and size of the high pressure chamber 3 and the low pressure chamber 7 according to different application environments, so that the sensor structure can adapt to different application scenarios.
The principle of the ring main unit voltage sensor structure described in this embodiment is:
referring to fig. 2, since the capacitance value ratio Kc between the high-voltage capacitor 4Cg and the sampling voltage-dividing capacitor group Cc is fixed, the capacitance value ratio Kqc between the energy-taking main capacitor group Cq and the energy-taking voltage-dividing capacitor group Cqc is fixed, and Kc is Kqc, while Kt1 and Kt2 of the sampling voltage-dividing transformer and the energy-taking voltage-dividing transformer are the transformation ratios of the two windings of the transformer and are also fixed values.
Therefore, from electrical knowledge it can be seen that:
the input voltage of the sampling voltage-dividing mutual inductor is as follows: VCc is V1/(Kc +1),
the input voltage of the energy-taking voltage-dividing mutual inductor is as follows: VCqc ═ V2/(Kqc +1),
then, the output voltage of the first output winding of the sampling voltage division transformer is Vo1 ═ VCc/Kt1, the output voltage of the first output winding of the energy-taking voltage division transformer is Vo1 ″ -VCqc/Kt 1,
the voltage of the first path of sampling signal can be derived as follows:
Vo1＝Vo1'+Vo1”＝(VCc+VCqc)/Kt1＝(V1+V2)/(Kc+1)/Kt1＝(V1+V2)/((Kc+1)*Kt1)，
as can be seen from the above formula, no matter how V1 and V2 change, Vi is V1+ V2, so Vo1 is Vi/((Kc +1) × Kt 1);
similarly, it can be derived that the voltage of the first sampled signal satisfies the formula Vo2 Vi/((Kc +1) × Kt2) no matter how V1 and V2 change.
In summary, the present embodiment can adjust the specific values of the two capacitance ratios Kc and Kqc according to different operating voltages to adapt to different operating voltages.
The technical scheme provided by the utility model is introduced in detail above. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.
Claims (7)
1. The utility model provides a looped netowrk cabinet voltage sensor structure, includes input binding post, insulator, the metal cavity that connects gradually, its characterized in that: a high-voltage cavity is formed in the insulator, a high-voltage capacitor is arranged in the high-voltage cavity, a low-voltage cavity is formed in the metal cavity, a sampling energy-taking module is arranged in the low-voltage cavity, one end of the high-voltage capacitor is connected with the input wiring terminal, and the other end of the high-voltage capacitor is connected with the sampling energy-taking module;
the sampling energy-taking module comprises a sampling partial pressure capacitor group, an energy-taking main capacitor group, an energy-taking partial pressure capacitor group, a sampling partial pressure transformer, a transformer and an energy-taking partial pressure transformer, wherein the sampling partial pressure capacitor group, the energy-taking main capacitor group and the energy-taking partial pressure capacitor group are connected between the high-voltage capacitor and the metal cavity after being connected in sequence, an input winding of the sampling partial pressure transformer is connected at two ends of the sampling partial pressure capacitor group, an input winding of the energy-taking partial pressure transformer is connected at two ends of the energy-taking partial pressure capacitor group, a first output winding of the sampling partial pressure capacitor group is connected to a first signal output line after being connected in series with a first output winding of the energy-taking partial pressure capacitor group, a second output winding of the sampling partial pressure capacitor group is connected in series with a second output winding of the energy-taking partial pressure capacitor group to a second signal output line, one end of a primary coil of the transformer is connected between the sampling partial, the other end of the transformer is connected between the energy-taking voltage-dividing capacitor bank and the metal cavity, and a secondary coil of the transformer is connected with a working power supply output line.
2. The ring main unit voltage sensor structure of claim 1, wherein: the lower part of the insulator is also provided with a shielding layer, and the upper end of the metal cavity is covered on the shielding layer.
3. The ring main unit voltage sensor structure of claim 2, wherein: the bottom of the metal cavity is connected with an output wiring terminal, and the first signal output line, the second signal output line and the working power supply output line are arranged in the output wiring terminal in a penetrating mode.
4. The ring main unit voltage sensor structure of claim 3, wherein: and a grounding terminal is formed beside the metal cavity and is electrically connected with the energy-taking voltage-dividing capacitor set.
5. The ring main unit voltage sensor structure of claim 1, wherein: the turn ratio of the input winding of the sampling voltage division transformer to the first output winding thereof is consistent with the turn ratio of the input winding of the energy-taking voltage divider to the first output winding thereof, and the turn ratio of the input winding of the sampling voltage division transformer to the second output winding thereof is consistent with the turn ratio of the input winding of the energy-taking voltage divider to the second output winding thereof.
6. The ring main unit voltage sensor structure of claim 1, wherein: an alternating current-direct current conversion circuit and an overvoltage protection circuit are connected between the secondary coil of the transformer and the working power supply output line.
7. The ring main unit voltage sensor structure of claim 1, wherein: and the positive input end of the input winding of the energy-taking voltage-dividing transformer is connected with an impedance matching circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022049003.8U CN213181744U (en) | 2020-09-18 | 2020-09-18 | Ring main unit voltage sensor structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022049003.8U CN213181744U (en) | 2020-09-18 | 2020-09-18 | Ring main unit voltage sensor structure |
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| CN213181744U true CN213181744U (en) | 2021-05-11 |
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| CN202022049003.8U Active CN213181744U (en) | 2020-09-18 | 2020-09-18 | Ring main unit voltage sensor structure |
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