CN219676125U

CN219676125U - Current-voltage sensor and self-electricity-taking three-in-one product

Info

Publication number: CN219676125U
Application number: CN202320418075.6U
Authority: CN
Inventors: 徐立子
Original assignee: Zhuhai Lichao Electric Power Technology Co ltd
Current assignee: Zhuhai Lichao Electric Power Technology Co ltd
Priority date: 2023-03-08
Filing date: 2023-03-08
Publication date: 2023-09-12
Anticipated expiration: 2033-03-08

Abstract

The utility model discloses a three-in-one product of a current and voltage sensor and self-electricity taking, which belongs to the technical field of current and voltage sensors, and comprises a transformer body, wherein one side of the transformer body is provided with a kilovolt high-voltage interface, and the bottom end of the transformer body is provided with a low-voltage cable navigation plug-in output interface, and the beneficial effects of the utility model are that: the intelligent power supply can be directly hung on a 10kV outdoor overhead transmission line to be matched with a high-voltage intelligent ammeter for use; the electric power taking device has the electricity taking function and is extremely convenient to use; construction is simplified, and construction cost is reduced; the old line is reformed and upgraded without considering PT installation positions and air spaces, so that the reforming difficulty is greatly reduced; the system can also be combined with a low-power FTU and a pole-mounted switch, and can be applied to positioning faults, isolating faults, line state monitoring, line loss measurement, fault processing and the like of a 10kV overhead line; the system can detect the current and the voltage of the 0.5 level on line, monitor the line loss at the same time, and is connected with a power distribution network dispatching automation system, thereby being beneficial to the stability and the economic dispatching of a power grid.

Description

Current-voltage sensor and self-electricity-taking three-in-one product

Technical Field

The utility model relates to the technical field of current and voltage sensors, in particular to a three-in-one product of a current and voltage sensor and self-electricity-taking.

Background

At present, the current and voltage measurement on the 10kV distribution network is always carried out by adopting an electromagnetic voltage transformer and a current transformer with iron core coils, the impedance of the voltage transformer is very small, and once the secondary side is short-circuited, the current is rapidly increased to burn the coils. Therefore, the primary side of the voltage transformer is connected with the fuse, and the secondary side is reliably grounded, so that personal and equipment accidents caused by high potential to the ground on the secondary side when the primary side and the secondary side are damaged in an insulating way are avoided. The equivalent circuit of the electromagnetic induction type voltage transformer is the same as that of the transformer. The traditional electromagnetic transformer for taking electricity of the circuit breaker on the outdoor column frequently generates secondary short-circuit and explosion accidents, and becomes one of main accidents of distribution network.

The prior art has the following problems:

1) The error is large and can only reach 1%;

2) Large and heavy;

3) The electromagnetic transformer for electricity taking is inconvenient in power supply, secondary short circuit and explosion accidents occur frequently, and the electromagnetic transformer for electricity taking becomes one of main accidents of a distribution network;

4) High price and difficult power grid intellectualization.

Disclosure of Invention

The utility model is provided in view of the problems existing in the existing current-voltage sensor and self-powered three-in-one product.

Therefore, the utility model aims to provide a three-in-one product of a current and voltage sensor and self-electricity-taking, which solves the problems in the prior art that: the error is large and can only reach 1%; large and heavy; the electromagnetic transformer for electricity taking is inconvenient in power supply, secondary short circuit and explosion accidents occur frequently, and the electromagnetic transformer for electricity taking becomes one of main accidents of a distribution network; high price and difficult power grid intellectualization.

In order to solve the technical problems, according to one aspect of the present utility model, the following technical solutions are provided:

the current-voltage sensor and self-electricity-taking three-in-one product comprises a transformer body, wherein a kilovolt high-voltage interface is arranged on one side of the transformer body, and a low-voltage cable navigation plug output interface is arranged at the bottom end of the transformer body.

As a preferable scheme of the three-in-one product of the current and voltage sensor and the self-electricity-taking device, the utility model comprises the following steps: the voltage sensor adopts a high-voltage ceramic capacitor of a CVT transformer structure.

As a preferable scheme of the three-in-one product of the current and voltage sensor and the self-electricity-taking device, the utility model comprises the following steps: the phase current is obtained by using a low power current sensor (LPCT) mode.

As a preferable scheme of the three-in-one product of the current and voltage sensor and the self-electricity-taking device, the utility model comprises the following steps: the weight of each transformer body is not more than 5kg.

As a preferable scheme of the three-in-one product of the current and voltage sensor and the self-electricity-taking device, the utility model comprises the following steps: the phase current is obtained by adopting a low-power consumption current transformer (LPCT) mode.

As a preferable scheme of the three-in-one product of the current and voltage sensor and the self-electricity-taking device, the utility model comprises the following steps: the phase current and the zero sequence current are wound by adopting independent line graphs, and the zero sequence current is independent. The phase voltages are collected independently, and the zero sequence voltage is obtained through a phase voltage synthesis method.

As a preferable scheme of the three-in-one product of the current and voltage sensor and the self-electricity-taking device, the utility model comprises the following steps: the analog output cable interface is an umbrella skirt-shaped silicon rubber module, and the output is connected with the FTU through a cable aviation plug with the length of 6-8 m.

Compared with the prior art:

1. the intelligent electric meter can be directly hung on a 10kV outdoor overhead transmission line to be matched with an intelligent electric meter;

2. the integrated device integrates the functions of voltage quantity acquisition, current quantity acquisition and self-electricity-taking, and supplies power to matched equipment. The traditional electromagnetic PT can be replaced, and line faults are reduced;

3. the method is applicable to a 10kV outdoor overhead transmission line, a pole switch or a low-power-consumption feeder terminal equipment combination, and is a main product for realizing intelligent distribution network;

4. it can detect the current and voltage of 0.5 level on line. Simultaneously monitoring the power angle and the line loss, and connecting with a power distribution network dispatching automation system, thereby being beneficial to the stability and economic dispatching of a power grid;

5. the electric power taking device has the electricity taking function and is extremely convenient to use; construction is simplified, and construction cost is reduced;

6. the old line is reformed and upgraded without considering PT installation positions and air spaces, so that the reforming difficulty is greatly reduced;

7. the combination with the low-power feeder terminal equipment FTU can easily realize secondary integration of distribution network; the volume is small, the weight is light, and each weight is not more than 5kg. The device can be directly hung on a 10kV outdoor overhead transmission line or a pole-mounted switch and low-power-consumption feeder terminal equipment for use;

8. the combined type high-voltage power supply is combined with a low-power FTU and a pole-mounted switch, and can be applied to 10kV overhead line positioning faults, line state monitoring, line loss measurement, fault processing and the like.

Drawings

FIG. 1 is a schematic diagram provided by the present utility model;

fig. 2 is a product diagram of the transformer body provided by the utility model;

FIG. 3 is a schematic diagram of a voltage section provided by the present utility model;

fig. 4 is a scene diagram of a specific use provided by the present utility model.

In the figure: the sensor comprises a sensor body 1, a low-voltage cable navigation plug output interface 2 and a kilovolt high-voltage interface 3.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, embodiments of the present utility model will be described in further detail below with reference to the accompanying drawings.

Example 1:

the utility model provides a three-in-one product of a current and voltage sensor and self-electricity taking, referring to fig. 1-4, comprising a transformer body 1, wherein one side of the transformer body 1 is provided with a kilovolt high-voltage interface 3, and the bottom end of the transformer body 1 is provided with a low-voltage cable navigation plug-in output interface 2.

The voltage transformer adopts a high-voltage ceramic capacitor of a CVT transformer structure; the phase current adopts a low-power consumption current transformer mode to obtain a current signal;

the weight of the sensor body 1 is not more than 5kg; the phase current adopts a low-power current sensor mode to obtain a current signal; the phase current and the zero sequence current are wound by adopting independent line graphs, and the zero sequence current is independent. The phase voltages are collected independently, and the zero sequence voltage is obtained through a phase voltage synthesis method.

The analog output cable interface is an umbrella skirt-shaped silicon rubber module, and the output is connected with the FTU through a cable aviation plug with the length of 6-8 m.

When the integrated structure of the current sensor, the voltage sensor and the energy taking module is directly hung on a 10kV line for use in specific use, and the integrated structure can be stably and reliably fixed on a wire without sliding and falling off.

Although the utility model has been described hereinabove with reference to embodiments, various modifications thereof may be made and equivalents may be substituted for elements thereof without departing from the scope of the utility model. In particular, the features of the disclosed embodiments may be combined with each other in any manner as long as there is no structural conflict, and the exhaustive description of these combinations is not given in this specification merely for the sake of omitting the descriptions and saving resources. Therefore, it is intended that the utility model not be limited to the particular embodiment disclosed, but that the utility model will include all embodiments falling within the scope of the appended claims.

Claims

1. The current and voltage sensor and the self-electricity-taking three-in-one product are characterized in that: the intelligent transformer comprises a transformer body, wherein one side of the transformer body is provided with a kilovolt high-voltage interface, and the bottom end of the transformer body is provided with a low-voltage cable navigation plug output interface.

2. The three-in-one product of a current and voltage sensor and self-powered electricity generation according to claim 1, wherein the voltage transformer is a high voltage ceramic capacitor of a CVT transformer structure.

3. The three-in-one product of a current and voltage sensor and self-powered electricity generation according to claim 1, wherein the phase current is a current signal obtained by a low-power current sensor.

4. The three-in-one product of a current and voltage sensor and self-powered electricity generation according to claim 1, wherein the weight of each transformer body is not more than 5kg.

5. The three-in-one product of a current and voltage sensor and self-powered electricity generation according to claim 1, wherein the phase current is a current signal obtained by a low-power current sensor.

6. The three-in-one product of a current and voltage sensor and self-power-taking according to claim 1, wherein the phase current and the zero sequence current are wound by adopting independent line diagrams, the phase voltage is independently collected, and the zero sequence voltage is obtained by a phase voltage synthesis method.

7. The three-in-one product of the current and voltage sensor and the self-electricity-taking device according to claim 1, wherein the analog output cable interface is an umbrella skirt-shaped silicon rubber module, and the output is connected with the FTU through a cable aviation plug with the length of 6-8 m.