CN210167793U

CN210167793U - CT secondary side overvoltage protector

Info

Publication number: CN210167793U
Application number: CN201921240035.7U
Authority: CN
Inventors: 王文军
Original assignee: Anhui Hongke Electric Power Technology Co Ltd
Current assignee: Anhui Hongke Electric Power Technology Co Ltd
Priority date: 2019-08-01
Filing date: 2019-08-01
Publication date: 2020-03-20
Anticipated expiration: 2029-08-01

Abstract

The utility model discloses a CT secondary side overvoltage protector, including insulating casing and last insulating casing down, insulating casing's the first engaging lug of outer wall bilateral symmetry fixedly connected with down, the outer wall bilateral symmetry fixedly connected with second engaging lug of going up insulating casing, the up end of second engaging lug is equipped with the screw, and perpendicular threaded connection has the bolt in the screw, insulating casing's inside is equipped with controller, trigger unit, judgement unit, collection module and alarm module down, and the controller comprises relay and silicon controlled rectifier, the controller respectively with trigger unit, judgement unit electric connection, insulating casing's bottom is equipped with binding post down. The utility model overcomes prior art's is not enough, reasonable in design makes the difficult overvoltage that produces of current transformer secondary side through multiple mode, and has certain dustproof radiating effect, has higher social use value and application prospect.

Description

CT secondary side overvoltage protector

Technical Field

The utility model relates to an electric power tech field especially relates to a CT secondary side overvoltage protector.

Background

A secondary side overvoltage protector of a Current Transformer (CT) is applied to measurement and control of primary current in an electric power system, the secondary side of the transformer is in an approximate short-circuit state during normal work, output voltage is low, and the secondary side overvoltage protector is widely applied to primary measurement, control and protection. It is an indispensable matching element for ampere meter, watt-hour meter and current control system.

During operation, if the secondary winding is open-circuited or abnormal current (such as lightning current, resonance overcurrent, capacitor charging current, inductance starting current and the like) flows through the primary winding, overvoltage of thousands of volts or even tens of thousands of volts is generated on the secondary side. The transformer not only causes damage to the insulation of a secondary system, but also can cause the transformer to be over-excited and burnt, and even endanger the life safety of workers. Therefore, the current transformer is also generally provided with a secondary overvoltage protector.

However, the current secondary overvoltage protector of the current transformer has a single protection mode and insufficient protection force, and is easy to cause failure of the protector, and once the protector fails, huge loss is caused, and meanwhile, the current secondary overvoltage protector also lacks a dustproof heat dissipation function.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem mentioned in the above-mentioned background art, the utility model provides a CT secondary side overvoltage protector.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a CT secondary side overvoltage protection device comprises a lower insulating shell and an upper insulating shell, wherein first connecting lugs are symmetrically and fixedly connected to two sides of the outer wall of the lower insulating shell, second connecting lugs are symmetrically and fixedly connected to two sides of the outer wall of the upper insulating shell, screw holes are formed in the upper end face of each second connecting lug, bolts are vertically and threadedly connected into the screw holes, a controller, a trigger unit, a judgment unit, an acquisition module and an alarm module are arranged in the lower insulating shell, the controller consists of a relay and a silicon controlled rectifier, the controller is respectively electrically connected with the trigger unit and the judgment unit, a wiring terminal is arranged at the bottom of the lower insulating shell, a mounting groove is formed in the center of the upper end face of the upper insulating shell, a mounting disc is arranged in the mounting groove, a plurality of connecting rods are uniformly arranged on the circumferential outer wall of the mounting disc in a surrounding mode, and one end, far away from the mounting disc, the bottom fixed mounting of installation disc has the exhaust fan, and the outside of exhaust fan is equipped with fixed shell, the upper end bilateral symmetry of mounting groove is equipped with the bracing piece, and the upper end of bracing piece is equipped with the protection casing.

Preferably, magnet pieces are arranged on the periphery of the upper end of the lower insulating shell and the periphery of the lower end of the upper insulating shell through grooves.

Preferably, the acquisition module is electrically connected with the judgment unit.

Preferably, the judging unit is electrically connected with the alarm module.

Preferably, the battery pack is arranged inside the lower insulating shell and is electrically connected with the controller, the trigger unit, the judgment unit, the acquisition module and the alarm module respectively.

Preferably, a filter screen is arranged in the mounting groove.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the lower insulating shell and the upper insulating shell are mutually adsorbed by arranging the magnet pieces, so that the lower insulating shell and the upper insulating shell can be quickly assembled and installed;

2. the heat in the shell can be conveyed outwards by starting the exhaust fan, so that the normal operation of the protector is ensured;

3. the protective cover plays a role of preventing objects from falling and has a rainproof effect;

4. under the double protection of the relay and the controllable silicon, when the voltage of the secondary side of the current transformer is abnormal, the secondary side of the current transformer is short-circuited, and the current transformer is in a protection state.

To sum up, the utility model overcomes prior art's is not enough, reasonable in design makes the difficult overvoltage that produces of current transformer secondary side through multiple mode, and has certain dustproof radiating effect, has higher social use value and application prospect.

Drawings

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is a bottom view of the upper insulating housing of the present invention;

fig. 3 is a schematic view of the frame structure of the present invention.

In the figure: the device comprises a lower insulating shell 1, an upper insulating shell 2, a first connecting lug 3, a second connecting lug 4, a bolt 5, a magnet piece 6, a wiring terminal 7, a controller 8, a trigger unit 9, a judging unit 10, an acquisition module 11, an alarm module 12, a fixed shell 13, an exhaust fan 14, an installation disc 15, a connecting rod 16, a filter screen 17, a supporting rod 18, a protective cover 19 and a screw hole 20.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Referring to fig. 1-3, a CT secondary side overvoltage protection device comprises a lower insulating housing 1 and an upper insulating housing 2, wherein first connection lugs 3 are symmetrically and fixedly connected to two sides of an outer wall of the lower insulating housing 1, second connection lugs 4 are symmetrically and fixedly connected to two sides of an outer wall of the upper insulating housing 2, a screw hole 20 is formed in an upper end surface of each second connection lug 4, a bolt 5 is vertically and threadedly connected into each screw hole 20, a controller 8, a trigger unit 9, a judgment unit 10, a collection module 11 and an alarm module 12 are arranged in the lower insulating housing 1, the controller 8 is composed of a relay and a thyristor, the relay and the thyristor are connected in parallel, only one path of conduction is needed to short-circuit the secondary side of a current transformer, so that the safety performance of the protector is improved, the controller 8 is electrically connected with the trigger unit 9 and the judgment unit 10, and the judgment unit 10 and the trigger unit 9, judge that unit 10 and trigger unit 9 also can be integrated on same singlechip simultaneously, the bottom of lower insulating casing 1 is equipped with binding post 7, the up end center department of going up insulating casing 2 is equipped with the mounting groove, and be equipped with installation disc 15 in the mounting groove, the circumference outer wall of installation disc 15 evenly encircles and is equipped with a plurality of connecting rod 16, and connecting rod 16 keeps away from the one end of installation disc 15 and is connected with the lateral wall of mounting groove, the bottom fixed mounting of installation disc 15 has exhaust fan 14, and exhaust fan 14's outside is equipped with fixed shell 13, the upper end bilateral symmetry of mounting groove is equipped with bracing piece 18, and the upper end of bracing piece 18 is equipped with protection casing 19, exhaust fan 14 is through external control switch electric connection commercial power.

Specifically, all be equipped with magnet piece 6 through the recess around the upper end of lower insulating housing 1 and the lower extreme of last insulating

housing

2, 6 mutual adsorptions of magnet piece of upper and lower extreme are laminated to convenient more swift aggregate erection.

Specifically, the acquisition module 11 is electrically connected to the determination unit 10, the determination unit 10 stores a preset voltage in advance, when the voltage signal acquired by the acquisition module 11 exceeds the preset voltage, it is described that an abnormality occurs on the secondary side of the current transformer, and the comparison signal sent by the determination unit 10 is a trigger signal.

Specifically, the determining unit 10 is electrically connected to the alarm module 12, and when the determining unit 10 sends a trigger signal, the alarm module 12 can receive the trigger signal and send an alarm to remind a user or a worker.

Specifically, the battery pack is arranged inside the lower insulating shell 1, and the battery pack is electrically connected with the controller 8, the trigger unit 9, the judgment unit 10, the acquisition module 11 and the alarm module 12 respectively, and supplies power to the controller 8, the trigger unit 9, the judgment unit 10, the acquisition module 11 and the alarm module 12 through the battery pack.

Specifically, be equipped with filter screen 17 in the mounting groove, can play certain filter effect through setting up filter screen 17, avoid dust impurity to get into in the casing.

The working principle is as follows: in the utility model, the magnet pieces 6 around the upper end of the lower insulating shell 1 are aligned to the magnet pieces 6 around the lower end of the upper insulating shell 2, the magnet pieces 6 are adsorbed to each other, so that the magnet pieces can be assembled and installed quickly, the first connecting lug 3 and the second connecting lug 4 are locked through the bolt 5, the exhaust fan 14 is installed in the fixed shell 13, the exhaust fan 14 is started to convey heat in the shell outwards, and meanwhile, the protection cover 19 is arranged to play a role of preventing objects from falling down, and the rainproof effect is achieved; when the voltage signal acquired by the acquisition module 11 exceeds the preset voltage, the controller 8 can control the short circuit of the secondary side of the current transformer, the controller 8 comprises a relay and a thyristor, the preset voltage is stored in the judgment unit 10 in advance, when the voltage signal acquired by the acquisition module 11 exceeds the preset voltage, the abnormity occurs on the secondary side of the current transformer, and the comparison signal sent by the judgment unit 10 is a trigger signal; the signal is transmitted to a trigger unit 9, the trigger unit 9 triggers an action coil of a relay to act, and a normally open contact of the relay is closed, so that the secondary side of the current transformer is short-circuited, and overvoltage is prevented from occurring on the secondary side of the current transformer; meanwhile, the trigger unit 9 triggers the silicon controlled rectifier to be closed, so that the secondary side of the current transformer is also short-circuited, and overvoltage is prevented from occurring on the secondary side of the current transformer; under the double protection of the relay and the controllable silicon, when the voltage of the secondary side of the current transformer is abnormal, the secondary side of the current transformer is short-circuited, and the current transformer is in a protection state.

Above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the design of the present invention, equivalent replacement or change should be covered within the protection scope of the present invention.

Claims

1. The utility model provides a CT secondary side overvoltage protector, includes insulating casing (1) and last insulating casing (2) down, its characterized in that: the lower insulating shell (1) is symmetrically and fixedly connected with first connecting lugs (3) at two sides of the outer wall, the upper insulating shell (2) is symmetrically and fixedly connected with second connecting lugs (4) at two sides of the outer wall, a screw hole (20) is formed in the upper end face of each second connecting lug (4), a bolt (5) is vertically connected with the inner portion of each screw hole (20) in a threaded manner, a controller (8), a trigger unit (9), a judgment unit (10), an acquisition module (11) and an alarm module (12) are arranged in the lower insulating shell (1), the controller (8) is composed of a relay and a controlled silicon, the controller (8) is respectively electrically connected with the trigger unit (9) and the judgment unit (10), a wiring terminal (7) is arranged at the bottom of the lower insulating shell (1), a mounting groove is formed in the center of the upper end face of the upper insulating shell (2), and a mounting disc (15) is arranged in the, the circumference outer wall of installation disc (15) evenly encircles and is equipped with a plurality of connecting rod (16), and connecting rod (16) keep away from the one end of installation disc (15) and the lateral wall of mounting groove and be connected, the bottom fixed mounting of installation disc (15) has exhaust fan (14), and the outside of exhaust fan (14) is equipped with fixed shell (13), the upper end bilateral symmetry of mounting groove is equipped with bracing piece (18), and the upper end of bracing piece (18) is equipped with protection casing (19).

2. The secondary overvoltage protection device of a CT as claimed in claim 1, wherein: magnet pieces (6) are arranged on the periphery of the upper end of the lower insulating shell (1) and the periphery of the lower end of the upper insulating shell (2) through grooves.

3. The secondary overvoltage protection device of a CT as claimed in claim 1, wherein: the acquisition module (11) is electrically connected with the judgment unit (10).

4. The secondary overvoltage protection device of a CT as claimed in claim 1, wherein: the judging unit (10) is electrically connected with the alarm module (12).

5. The secondary overvoltage protection device of a CT as claimed in claim 1, wherein: the battery pack is arranged in the lower insulating shell (1) and is electrically connected with the controller (8), the trigger unit (9), the judgment unit (10), the acquisition module (11) and the alarm module (12) respectively.

6. The secondary overvoltage protection device of a CT as claimed in claim 1, wherein: a filter screen (17) is arranged in the mounting groove.