CN209784476U - zero sequence fault indicator - Google Patents

Abstract

The application provides a zero-sequence fault indicator, which includes a power-taking device, a current processing circuit and a device power supply. The power taking device is electrically connected to any one phase wire in the three-phase wires. The input terminal of the current processing circuit is electrically connected with the power taking device. The current processing circuit is used to convert the current obtained by the power acquisition device 100 . The device power supply is electrically connected to the output terminal of the current processing circuit. The device power supply is used to provide DC power for the zero-sequence fault indicator. The present application cooperates with the three-phase electric wires by the power-taking device, and transmits the electric energy on any phase electric wire of the three-phase electric wires to the power supply of the device through the current processing circuit, so as to supply power for the power supply of the device, thereby enabling all The power supply mode of the above-mentioned zero-sequence fault indicator is more diversified and more adaptable.

Description

zero sequence fault indicator

technical field

The application relates to the technical field of power distribution equipment, in particular to a zero-sequence fault indicator.

Background technique

In the power distribution network, the cable ground fault is mostly judged by the zero-sequence fault indicator. When in use, the induction current transformer (CT) on the zero-sequence fault indicator is set on the three-phase composite line to realize the detection of cable circuit faults. The zero-sequence fault indicator is different from the overhead type fault indicator, because the composite voltage on the three-phase composite line is zero, and the inductive CT on the zero-sequence fault indicator cannot directly take power from the three-phase composite Electricity problem. The existing zero-sequence fault indicators all rely on a large-capacity dry battery to provide power in the power supply mode.

Due to the power supply of dry batteries, there is limited power, short power consumption time, and a certain period of service life, and changes in temperature during operation will shorten the service life of the device; resulting in zero-sequence fault indication due to the single power supply mode The problem of scrapping the entire device of the device.

Utility model content

Based on this, it is necessary to provide a zero-sequence fault indicator to solve the problems that the existing zero-sequence fault indicator is difficult to obtain power online and has a single power supply mode.

A zero sequence fault indicator comprising:

The power taking device is electrically connected to any one of the three-phase wires;

A current processing circuit, the input terminal of the current processing circuit is electrically connected to the power-taking device, and is used to convert the current obtained by the power-taking device;

The device power supply is electrically connected to the output terminal of the current processing circuit, and is used to provide DC power for the zero-sequence fault indicator.

In one of the embodiments, the power taking device includes:

A voltage transformer or a current transformer is electrically connected to any one of the three-phase wires, and the voltage transformer or current transformer is also electrically connected to the input end of the current processing circuit.

In one of the embodiments, the zero-sequence fault indicator also includes:

The main body, the current processing circuit and the device power supply are all arranged in the main body.

In one of the embodiments, the zero-sequence fault indicator also includes:

A rechargeable battery is arranged in the body and is electrically connected to the current processing circuit, and the current converted by the current processing circuit is directly stored in the device power supply, or charged for the rechargeable battery.

In one of the embodiments, the zero-sequence fault indicator also includes:

A waterproof connector, one end of the waterproof connector is electrically connected to the power supply of the device, and the other end of the waterproof connector is used for electrical connection with the power-taking device; or the other end of the waterproof connector is used for electrical connection with an external power supply , so as to charge the rechargeable battery through the external power source.

In one of the embodiments, the zero-sequence fault indicator includes:

The power detector is arranged in the body and electrically connected with the current processing circuit, the device power supply and the rechargeable battery respectively.

In one of the embodiments, the zero-sequence fault indicator also includes:

The main controller is arranged in the body and electrically connected between the power detector and the current processing circuit.

In one of the embodiments, the current processing circuit further includes:

A rectifier circuit is arranged in the body, and the input terminal of the rectifier circuit is electrically connected to the power-taking device;

The conversion circuit is arranged in the body, the input end of the conversion circuit is electrically connected to the output end of the rectification circuit, and the output end of the conversion circuit is electrically connected to the power supply of the device.

In one of the embodiments, the rectification circuit includes:

The bridge rectifier is electrically connected between the input end of the conversion circuit and the power-taking device.

In one of the embodiments, the conversion circuit includes:

A DC/DC converter, the input end of the DC/DC converter is electrically connected to the output end of the rectification circuit, and the output end of the DC/DC converter is electrically connected to the device power supply.

Compared with the prior art, the above-mentioned zero-sequence fault indicator obtains electric energy from any one phase electric wire of the three-phase electric wire through the electric taking device, and the electric energy is transferred to the power supply of the device after being converted by the electric current processing circuit, thereby Supplying power to the zero-sequence fault indicator can make the power supply mode of the zero-sequence fault indicator more diversified and more adaptable.

Description of drawings

Fig. 1 is the structural schematic diagram of the zero-sequence fault indicator provided by an embodiment of the present application;

Fig. 2 is a structural schematic diagram of a zero-sequence fault indicator provided by an embodiment of the present application for taking power or charging;

FIG. 3 is a structural block diagram of a zero-sequence fault indicator provided by an embodiment of the present application;

FIG. 4 is a structural block diagram of a fault control device provided by an embodiment of the present application;

FIG. 5 is a structural block diagram of a fault control system provided by an embodiment of the present application.

10 Zero sequence fault indicator

100 power-taking device

101 wire

102 Ontology

110 Potential transformer or current transformer

20 Fault control device

21 control device

22 Wireless Communication Devices

200 current processing circuit

210 rectifier circuit

211 bridge rectifier

220 conversion circuit

221 DC/DC Converter

30 fault control system

31 host device

300 unit power

400 external power supply

500 waterproof connector

600 rechargeable batteries

800 battery tester

900 master controller

Detailed ways

In order to make the above-mentioned purpose, features and advantages of the present application more obvious and understandable, the specific implementation manners of the present application will be described in detail below in conjunction with the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the application. However, the present application can be implemented in many other ways different from those described here, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific implementation disclosed below.

It should be noted that when an element is referred to as being “fixed” to another element, it can be directly on the other element or there can also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used herein in the specification of the application are only for the purpose of describing specific embodiments, and are not intended to limit the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to FIG. 1 , the embodiment of the present application provides a zero-sequence fault indicator 10 , including a power-taking device 100 , a current processing circuit 200 and a device power supply 300 . The power fetching device 100 is electrically connected to any phase wire 101 of the three-phase wires. The input terminal of the current processing circuit 200 is electrically connected with the power taking device 100 . The current processing circuit 200 is used for converting the current obtained by the power acquisition device 100 . The device power supply 300 is electrically connected to the output end of the current processing circuit 200 . The device power supply 300 is used to provide DC power for the zero sequence fault indicator 10 .

It can be understood that the specific structure of the power taking device 100 is not specifically limited, as long as it can take power from the electric wire 101 of any one phase of the three-phase electric wire. The specific structure of the power-taking device 100 can be selected according to actual needs. In one embodiment, the power taking device 100 may be a first voltage transformer. In one embodiment, the power taking device 100 may also be a first current transformer. In an embodiment, the power taking device 100 may also be a voltage-current combination transformer. In one embodiment, the power fetching device 100 can be sleeved on the electric wire 101 of any phase of the three-phase electric wires.

It can be understood that the specific structure of the current processing circuit 200 is not specifically limited, as long as it can convert the current transmitted from the power-taking device 100 into a current that can charge the device power supply 300 . The specific circuit structure of the current processing circuit 200 can be selected according to actual needs. In one embodiment, the current processing circuit 200 may be an AC/DC converter.

It can be understood that the specific structure of the device power supply 300 is not specifically limited, as long as it has the function of providing DC power for the zero-sequence fault indicator 10 . The specific structure of the device power supply 300 can be selected according to actual needs. In one embodiment, the device power supply 300 may be a lead-acid battery with charging and discharging functions. In one embodiment, the device power supply 300 may also be a UPS battery with charging and discharging functions.

It can be understood that there is no limit to the manner in which the device power supply 300 is electrically connected to the output end of the current processing circuit 200 , as long as the power supply between the device power supply 300 and the current processing circuit 200 is ensured. In one embodiment, the device power supply 300 can be electrically connected to the output end of the current processing circuit 200 through a first wire. Specifically, the material of the first wire can be selected according to requirements. In one embodiment, the first wire may be a copper wire. In one embodiment, the first wire may also be an aluminum wire. In one embodiment, the device power supply 300 may also be directly electrically connected to the output terminal of the current processing circuit 200 .

In this embodiment, through the cooperation of the power taking device 100 and the three-phase electric wire, the electric energy on the electric wire 101 of any phase of the three-phase electric wire is transmitted to the device power supply 300 through the current processing circuit 200 , so as to supply power to the device power supply 300, thereby making the power supply mode of the zero-sequence fault indicator 10 more diversified and more adaptable.

Please refer to FIG. 2 , in one embodiment, the power taking device 100 includes a voltage transformer or a current transformer 110 . The voltage transformer or current transformer 110 is electrically connected to any phase wire 101 of the three-phase wires. The voltage transformer or current transformer 110 is also electrically connected to the input terminal of the current processing circuit 200 . The voltage transformer or current transformer 110 converts the large current on the wire 101 of any phase of the three-phase wire into a small current through the principle of electromagnetic induction, and then transmits it to the power supply of the device through the current processing circuit 200 300, and then supply power to the device power supply 300.

In one embodiment, the zero sequence fault indicator 10 further includes a body 102 . The current processing circuit 200 and the device power supply 300 are both disposed in the main body 102 . It can be understood that the shape of the body 102 is not limited, as long as the current processing circuit 200 and the device power supply 300 can be disposed in the body 102 . It should be noted that, in addition to being the carrier of the above-mentioned functional devices, the body can also include the conventional functions of the existing zero-sequence fault indicator. In one embodiment, the shape of the body 102 can be cuboid or cylindrical shape.

In one embodiment, the zero sequence fault indicator 10 further includes a rechargeable battery 600 . The rechargeable battery 600 is disposed in the body 102 . The rechargeable battery 600 is electrically connected to the current processing circuit 200 . The current converted by the current processing circuit 200 is directly stored in the device power supply 300 or charged for the rechargeable battery 600 . It can be understood that the type of the rechargeable battery 600 is not limited, as long as it has a charging function. In one embodiment, the rechargeable battery 600 may be a lead-acid battery. In one embodiment, the rechargeable battery 600 may also be a UPS battery with charging and discharging functions.

In one embodiment, the zero-sequence fault indicator 10 further includes a waterproof joint 500 . One end of the waterproof connector 500 is electrically connected to the device power supply 300, and the other end of the waterproof connector 500 is used to electrically connect to the power-taking device 100; or the other end of the waterproof connector 500 is used to connect to an external power supply 400 is electrically connected to charge the rechargeable battery 600 through the external power source 400 . Furthermore, it is ensured that the zero-sequence fault indicator 10 can still be charged under the extreme condition that both the three-phase electric wire and the rechargeable battery 600 are out of power, so that the power supply mode of the zero-sequence fault indicator 10 is more diversified , more adaptable.

In one embodiment, the external power supply 400 may be a 220V commercial power supply, or a solar panel. In one embodiment, the waterproof connector 500 can only be selectively connected to one of the power taking device 100 and the external power supply 400 at a time. That is, the waterproof connector 500 is electrically connected to the power-taking device 100 , or the waterproof connector 500 is electrically connected to the external power source 400 .

Please refer to FIG. 3 , in one embodiment, the zero-sequence fault indicator 10 further includes a power detector 800 and a main controller 900 . The power detector 800 is disposed in the body 102 . The power detector 800 is electrically connected to the current processing circuit 200 , the device power supply 300 and the rechargeable battery 600 respectively. The main controller 900 is disposed in the body 102 . The main controller 900 is electrically connected between the power detector 800 and the current processing circuit 200 .

In one embodiment, the power detector 800 is used to monitor the power of the device power supply 300 and the rechargeable battery 600 . In one embodiment, when the zero-sequence fault indicator 10 uses the electricity obtained by the power-taking device 100, if the power detector 800 detects that the power of the rechargeable battery 600 is not full or has no power, then The signal is sent to the main controller 900 , and then the main controller 900 controls the power-taking device 100 to also charge the rechargeable battery 600 .

In one embodiment, the current processing circuit 200 includes: a rectification circuit 210 and a conversion circuit 220 . The rectification circuit 210 is disposed in the body 102 . The input terminal of the rectification circuit 210 is electrically connected with the power taking device 100 . The conversion circuit 220 is disposed in the body 102 . The input end of the conversion circuit 220 is electrically connected to the output end of the rectification circuit 210 . The output terminal of the conversion circuit 220 is electrically connected to the device power supply 300 .

In one embodiment, the rectification circuit 210 may be composed of a bridge rectifier 211 together with resistors and capacitors. In one embodiment, the bridge rectifier 211 is electrically connected between the input end of the conversion circuit 220 and the power-taking device 100 . In one embodiment, the rectification circuit 210 may also be a traditional circuit with the function of converting alternating current into direct current.

In one embodiment, the conversion circuit 220 includes a DC/DC converter 221 . The input terminal of the DC/DC converter 221 is electrically connected with the power taking device 100 . The output end of the DC/DC converter 221 is electrically connected to the device power supply 300 . The current rectified by the rectification circuit 210 is converted into a current capable of charging the device power supply 300 through the DC/DC converter 221 .

When this application is in use, first install the zero-sequence fault indicator 10 on the three-phase wire according to the design requirements, and connect the power-taking device 100 to one phase of the three-phase wire according to the voltage level of the specific phase wire. The electric wire 101 is electrically connected. The power taking device 100 can be a transformer that converts 10kv to 3.6v or 35kv to 3.6v, which can be selected manually according to needs. When the power-taking device 100 can get electricity, the working power source of the zero-sequence fault indicator 10 preferentially uses the power taken by the power-taking device 100 . At the same time, the power detector 800 is used to detect whether the rechargeable battery 600 has electricity, and if the power is not enough, the main controller 900 controls the power-taking device 100 to charge the rechargeable battery 600 at the same time. If the power-taking device 100 fails to get power, the rechargeable battery 600 supplies power to the zero-sequence fault indicator 10 . In an extreme situation where both the three-phase power line and the rechargeable battery 600 are dead, the external power source 400 can be used to charge the zero sequence fault indicator device 10 . The external power supply 400 is connected to an external 220V commercial power.

To sum up, the present application cooperates with the three-phase wires through the power-taking device 100 to transmit the electric energy on the wires 101 of any phase of the three-phase wires to the device through the current processing circuit 200 The power supply 300 supplies power to the device power supply 300, thereby making the power supply mode of the zero-sequence fault indicator 10 more diversified and more adaptable.

Referring to FIG. 4 , an embodiment of the present application provides a fault control device 20 , including the zero-sequence fault indicator 10 described in any one of the above embodiments. In one embodiment, the fault control device 20 further includes a control device 21 . The control device 21 is in communication connection with the zero sequence fault indicator 10 . The control device 21 is used to control the on and off of the zero sequence fault indicator 10 . In one embodiment, the control device 21 may be a conventional controller. In one embodiment, the control device 21 may also be a Micro Control Unit (MCU).

In one embodiment, the fault control device 20 further includes a wireless communication device 22 . The control device 21 is communicatively connected with the zero-sequence fault indicator 10 through a wireless communication device 22 . In one embodiment, the communication mode of the wireless communication device 22 may be Bluetooth or WIFI or radio frequency signal and so on.

The fault control device 20 cooperates with the three-phase electric wire through the power-taking device 100, and transmits the electric energy on the electric wire 101 of any phase of the three-phase electric wire to the power supply of the device through the current processing circuit 200. 300, so as to supply power to the device power supply 300, thereby making the power supply mode of the zero-sequence fault indicator 10 in the fault control device 20 more diversified, and making the fault control device 20 more adaptable.

Referring to FIG. 5 , an embodiment of the present application provides a fault control system 30 , including the zero-sequence fault indicator 10 and a host device 31 as described in any one of the above embodiments. The host device 31 is in communication connection with the zero sequence fault indicator 10 . In one embodiment, the host device 31 may be a computer, a mobile phone, a tablet, and the like.

The fault control system 30 cooperates with the three-phase electric wire through the power-taking device 100, and transmits the electric energy on the electric wire 101 of any phase of the three-phase electric wire to the power supply of the device through the current processing circuit 200. 300, so as to supply power to the device power supply 300, thereby making the power supply mode of the zero-sequence fault indicator 10 in the fault control system 30 more diversified, and making the fault control system 30 more adaptable.

The various technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the various technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification.

The above-mentioned embodiments only express several implementation modes of the present application, and the description thereof is relatively specific and detailed, but it should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of protection of the patent application should be based on the appended claims.

Claims (10)

1. A zero sequence fault indicator, comprising:

The power taking device (100) is electrically connected with any one phase electric wire (101) in the three-phase electric wires;

The current processing circuit (200), the input end of the current processing circuit (200) is electrically connected with the electricity-taking device (100) and is used for converting the current obtained by the electricity-taking device (100);

And the device power supply (300) is electrically connected with the output end of the current processing circuit (200) and is used for providing direct current power supply for the zero sequence fault indicator (10).

2. the zero sequence fault indicator of claim 1, wherein the power take-off device (100) comprises:

and the voltage transformer or the current transformer (110) is electrically connected with any one phase wire (101) in the three-phase wires, and the voltage transformer or the current transformer (110) is also electrically connected with the input end of the current processing circuit (200).

3. The zero sequence fault indicator of claim 1, further comprising:

A body (102), the current processing circuit (200) and the device power supply (300) are both disposed in the body (102).

4. The zero sequence fault indicator of claim 3, further comprising:

And the rechargeable battery (600) is arranged in the body (102) and is electrically connected with the current processing circuit (200), and the current converted by the current processing circuit (200) is directly stored in the device power supply (300) or is used for charging the rechargeable battery (600).

5. The zero sequence fault indicator of claim 4, further comprising:

One end of the waterproof connector (500) is electrically connected with the device power supply (300), and the other end of the waterproof connector (500) is used for being electrically connected with the power taking device (100); or the other end of the waterproof connector (500) is used for being electrically connected with an external power supply (400) so as to charge the rechargeable battery (600) through the external power supply (400).

6. The zero sequence fault indicator of claim 3, further comprising:

And the electric quantity detector (800) is arranged in the body (102) and is respectively and electrically connected with the current processing circuit (200), the device power supply (300) and the rechargeable battery (600).

7. The zero sequence fault indicator of claim 6, further comprising:

And the master controller (900) is arranged in the body (102) and is electrically connected between the electric quantity detector (800) and the current processing circuit (200).

8. The zero sequence fault indicator of claim 3, characterized in that the current processing circuit (200) comprises:

The rectifying circuit (210) is arranged in the body (102), and the input end of the rectifying circuit (210) is electrically connected with the power taking device (100);

the conversion circuit (220) is arranged in the body (102), the input end of the conversion circuit (220) is electrically connected with the output end of the rectification circuit (210), and the output end of the conversion circuit (220) is electrically connected with the device power supply (300).

9. The zero sequence fault indicator of claim 8, wherein the rectifying circuit (210) comprises:

The bridge rectifier (211) is electrically connected between the input end of the conversion circuit (220) and the power taking device (100).

10. The zero sequence fault indicator of claim 8, wherein the conversion circuit (220) comprises:

A DC/DC converter (221), an input terminal of the DC/DC converter (221) being electrically connected to an output terminal of the rectifying circuit (210), an output terminal of the DC/DC converter (221) being electrically connected to the device power supply (300).