CN212392457U - Secondary short circuit protection device for current transformer - Google Patents

Abstract

In order to solve the problems of poor short circuit safety, easy confusion and the like of the current transformer, the utility model provides a secondary short circuit protection device of the current transformer, which mainly comprises an insulating protective cover, a plurality of groups of plugs which are arranged inside the insulating protective cover and connected in parallel through a loop short circuit, an alarm device and a plurality of groups of current monitoring devices, wherein the number of the groups of the current monitoring devices corresponds to the number of the plugs, the secondary short circuit protection device consists of a Hall element, an analog-to-digital converter and a first display which are connected in sequence, the Hall element is arranged at the loop short circuit of the plugs and used for detecting current, the alarm device consists of a programmable integrated circuit type timer, a buzzer, a second display and a power supply, the buzzer and the second display are both connected with a counter module of the programmable integrated circuit type timer and are respectively used for alarming and displaying timing time, in addition, the first display screen and the second display screen are both located on the outer surface of the insulating protective cover.

Description

Secondary short circuit protection device for current transformer

Technical Field

The utility model relates to a current transformer technical field, in particular to current transformer secondary short circuit protector.

Background

At present, the secondary current is not allowed to be opened when the current transformer operates, and the secondary current can appear under the condition of opening: 1. high voltage is generated secondarily, and the high voltage can break through the insulation of the current transformer, so that the shell of the whole power distribution equipment is electrified to generate electric shock danger; 2, the iron core suddenly changes to be saturated, so that the iron core loss of the mutual inductor is increased, the iron core can generate heat, and the mutual inductor is damaged; and 3, the iron core of the transformer is saturated, the metering is out of alignment, and the specific difference and the angular difference of the current transformer are increased. To solve this problem, the secondary current is short-circuited during installation. The prior art mainly adopts finished product short splicing pieces, or short-circuits by using plug-in test wires, or short-circuits by manually manufacturing single-stranded copper core wires, and the like, and the method has the following problems:

the application scenario of the finished product short contact pieces has great limitation, for example, when a terminal interval exists between two wiring terminals, the finished product short contact pieces are difficult to realize short circuit;

secondly, the plug-in type test wire is used for short-circuit conveniently and quickly, but whether the short-circuit is successful cannot be determined at the first time, for example, the wire core in the test wire is broken;

thirdly, manually manufactured single-stranded copper core short-circuit wires need to be pressed into the terminal row wiring terminals in a wiring mode, whether the pressing connection is firm or not and whether the contact area is qualified or not are all determined by experience; secondly, the short-circuit wire needs to be manufactured manually on site, if the short-circuit wire with the multiphase short circuit is encountered, the manufacturing process is not easy to control, and the wiring modes of the current transformer are various due to the fact that the specifications of the terminal rows cannot be unified frequently, so that the manufacturing process is complicated; in addition, the short-circuit line is not marked, if the record cannot be made in time, the short-circuit line is easy to be confused with the original wiring, and the phenomenon of mistaken disassembly and missed disassembly is probably caused by carelessness when secondary safety measures are executed and recovered in a subsequent link.

Disclosure of Invention

In order to solve the problem, the utility model provides a current transformer secondary short circuit protector, the technical scheme of adoption as follows:

a secondary short circuit protection device of a current transformer is characterized by mainly comprising an insulating protection cover, a plurality of groups of plugs which are arranged in the insulating protection cover and connected in parallel through a loop short circuit wire, an alarm device and a plurality of groups of current detection devices, the number of the current detection device groups corresponds to the number of the plugs, the current detection device is composed of a Hall element, an analog-to-digital converter and a first display screen which are connected in sequence, the Hall element is arranged at a short circuit wire of the plug and is used for detecting current, the alarm device consists of a programmable integrated circuit timer, a buzzer, a second display screen and a power supply, the buzzer and the second display screen are both connected with a counter module of the programmable integrated circuit type timer and are respectively used for alarming and displaying timing time, in addition, the plug all stretches out the outside certain length of insulating protection casing, first display screen and second display screen all are located the surface of insulating protection casing.

Preferably, the analog-to-digital converter is a double integral analog-to-digital converter.

Preferably, the insulating protective cover is made of PBT materials.

Preferably, the programmable integrated circuit timer is connected with four buttons of starting, pausing, time setting and resetting.

The beneficial effects of the utility model reside in that: in a short circuit state, according to the actual position of a short-circuit terminal on a terminal strip, selecting a corresponding plug to be inserted to the terminal strip needing short circuit, and realizing short circuit of a secondary circuit of the current transformer between wiring terminals; the Hall element, the analog-to-digital converter and the first display screen realize the visualization of the short-circuit current by acquiring, processing and displaying the short-circuit current data; in addition, the timing alarm module which is composed of the programmable integrated circuit type timing module, the buzzer, the second display screen, the power supply and the button can set countdown according to working time, the buzzer is triggered to sound after the countdown is finished, field operation personnel are warned to pull out the short-circuit device, and the situation that the short-circuit device is forgotten to be removed after the working is finished can be effectively prevented.

Drawings

FIG. 1 is a schematic view of the structure of the present invention

The device comprises an insulating protective cover 1, a first display screen 2, an analog-to-digital converter 3, a Hall element 4, a loop short-circuit wire 5, a plug 6, a second display screen 7, a button 8, a programmable integrated circuit timer 9, a buzzer 10 and a power supply 11.

Detailed Description

An exemplary embodiment of the present disclosure will be described in more detail below with reference to fig. 1. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description of the present invention, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

The secondary short circuit protection device of the current transformer shown in figure 1 mainly comprises an insulating protective cover 1, a plurality of plugs 6, a plurality of groups of current detection devices and an alarm device, wherein the insulating protective cover 1 is made of PBT material, the strength and the insulation resistance are high, the high temperature resistance and the flame retardance are good, the phenomenon that a high voltage is induced when the secondary side of the current transformer is opened or is in poor contact and the phenomena of arc discharge, heating and the like are caused is prevented, the plurality of plugs 6 are connected in parallel through a loop short circuit wire, the plugs 6 adopt a pluggable structure, one end of each plug 6 is fixedly connected inside the insulating protective cover 1, the lower end of each plug 6 extends out of the lower end of the corresponding insulating protective cover 2 for a certain length, the other ends of two adjacent plugs 6 are connected through the loop short circuit wire 5, and the current detection devices are composed of a Hall element 4, an analog-to-, first display screen 2 sets up the last presentation department at insulating protective cover 1 for show the electric current size that detects, alarm device is by programmable integrated circuit formula time-recorder 9, second display screen 7, bee calling organ 10 and power 11, programmable integrated circuit formula time-recorder 9's timing module output links to each other with second display screen 7 and bee calling organ 10, be used for showing respectively that the timing time and time report to the police after by, power 11 provides the electric energy for programmable integrated circuit formula time-recorder 9, in addition, still be connected with the start-up on programmable integrated circuit formula time-recorder 9, pause, time setting and four buttons 8 that reset.

The operation is as follows: firstly, according to the actual position of a short-circuit terminal on a terminal row, a corresponding plug 6 is selected, at the moment, a current signal measured by a Hall element 4 is displayed on a first display screen 2 after being converted by an analog-to-digital converter 3, then a start button 8 is pressed, the timing time is set, a programmable integrated circuit type timer 9 is started, and after the timing is finished, a buzzer 10 gives an alarm to prompt a worker to reply to an original circuit and remove the short-circuit device.

This device simple structure can realize the standardized operation of current transformer secondary short circuit, has warning prompt facility, prevents to demolish the potential safety hazard that the short circuit device brought, safe and reliable, portable.

The above description is only a preferred embodiment of the present invention, and it should be noted that: for those skilled in the art, without departing from the principle of the present invention, several improvements can be made, and these improvements should also be regarded as the protection scope of the present invention.

Claims (4)

1. A secondary short circuit protection device of a current transformer is characterized by mainly comprising an insulating protective cover, a plurality of groups of plugs, an alarm device and a plurality of groups of current detection devices, wherein the plugs are arranged in the insulating protective cover and connected in parallel through a loop short circuit, the number of the groups of the current detection devices corresponds to the number of the plugs, the current detection devices are composed of Hall elements, an analog-to-digital converter and a first display screen which are sequentially connected, the Hall elements are arranged at the loop short circuit of the plugs and used for detecting current, the alarm device is composed of a programmable integrated circuit timer, a buzzer, a second display screen and a power supply, the buzzer and the second display screen are both connected with a counter module of the programmable integrated circuit timer and used for alarming and displaying timing time respectively, in addition, the plugs extend out of the insulating protective cover for a certain length, the first display screen and the second display screen are both located on the outer surface of the insulating protective cover.

2. The secondary short circuit protection device of current transformer according to claim 1, wherein said analog-to-digital converter is a double integral analog-to-digital converter.

3. The secondary short circuit protection device of current transformer according to claim 1, characterized in that the insulating protection cover is made of PBT material.

4. The secondary short circuit protection device of current transformer according to claim 1, wherein four buttons of start, pause, time setting and reset are connected to said programmable ic timer.

Images