CN210039896U

CN210039896U - Voltage transformer capable of preventing iron core from being grounded at multiple points

Info

Publication number: CN210039896U
Application number: CN201920747509.0U
Authority: CN
Inventors: 于捍国; 文天贤
Original assignee: DALIAN NEW ANYUE ELECTRIC POWER EQUIPMENT Co Ltd
Current assignee: DALIAN NEW ANYUE ELECTRIC POWER EQUIPMENT Co Ltd
Priority date: 2019-05-23
Filing date: 2019-05-23
Publication date: 2020-02-07
Anticipated expiration: 2029-05-23

Abstract

The utility model relates to a power equipment technical field provides a prevent voltage transformer of iron core multiple spot ground connection, include: the transformer comprises an iron core, a voltage secondary coil, a voltage primary coil, a primary terminal, an insulating medium, a grounding current output terminal, a mounting insert, a grounding current coil, a secondary terminal and an iron core grounding wire; a voltage secondary coil is wound on a core column at one side of the iron core, the iron core penetrates through the voltage primary coil, and the voltage primary coil is positioned at the corresponding position of the voltage secondary coil; two ends of the voltage primary coil are respectively connected with a primary terminal; the iron core is connected with the installation insert through an iron core grounding wire; the grounding current grounding wire penetrates through the grounding current coil, and two ends of the grounding current coil are respectively connected with the grounding current output terminal. The utility model discloses can effectively prevent the emergence of the electric power accident that arouses because of voltage transformer iron core multiple spot ground connection.

Description

Voltage transformer capable of preventing iron core from being grounded at multiple points

Technical Field

The utility model relates to a power equipment technical field especially relates to a prevent voltage transformer of iron core multiple spot ground connection.

Background

In a power system, a voltage transformer is applied to measurement and control of primary phase voltage or line voltage, when the power system normally operates or is tested, an iron core is in a strong electric field, and due to the electrostatic induction effect, a suspension potential is generated on the iron core, so that the iron core is easy to discharge to the ground and damage, and therefore the iron core must be grounded. However, if there are two or more points of grounding, a closed loop is formed between the grounding points, when the voltage transformer is in operation, its main magnetic flux passes through the closed loop, and then a circular current is generated, which causes local overheating of the iron core, burning of components and insulation, and accidents, so that the voltage transformer only allows one point of grounding.

The traditional voltage transformer only connects one point on an iron core with the ground wire, but when the iron core is grounded at multiple points due to insulation aging or overvoltage, no iron core grounding current monitoring is carried out, so that the voltage transformer continues to operate, and finally burning accidents occur. The normal operation of the power system is influenced, and the safety of operators is endangered.

SUMMERY OF THE UTILITY MODEL

The utility model discloses mainly solve prior art's voltage transformer and do not have iron core ground current monitoring function, when iron core multiple spot ground connection, technical problem such as voltage transformer burns out easily provides a prevent voltage transformer of iron core multiple spot ground connection, can have the emergence of effectively preventing the electric power accident that arouses because of voltage transformer iron core multiple spot ground connection.

The utility model provides a prevent voltage transformer of iron core multiple spot ground connection, include: the transformer comprises an iron core (1), a voltage secondary coil (2), a voltage primary coil (3), a primary terminal (4), an insulating medium (5), a grounding current output terminal (6), an installation insert (7), a grounding current coil (8), a secondary terminal (10) and an iron core grounding wire (11);

a voltage secondary coil (2) is wound on a core column at one side of the iron core (1), the iron core (1) penetrates through the voltage primary coil (3), and the voltage primary coil (3) is located at the corresponding position of the voltage secondary coil (2); two ends of the voltage primary coil (3) are respectively connected with a primary terminal (4);

the iron core (1) is connected with the installation insert (7) through an iron core grounding wire (11); the iron core grounding wire (11) penetrates through the grounding current coil (8), and two ends of the grounding current coil (8) are respectively connected with the grounding current output terminal (6);

the iron core (1), the voltage secondary coil (2), the voltage primary coil (3), the primary terminal (4), the grounding current output terminal (6), the installation insert (7), the secondary terminal (10) and the iron core grounding wire (11) are cast into a whole through the insulating medium (5).

Preferably, the insulating medium (5) is epoxy resin.

Preferably, a mounting bottom plate (9) is arranged at the bottom of the insulating medium (5).

Preferably, the mounting base plate (9) is connected to the mounting insert (7).

Preferably, the grounding current coil (8) comprises an annular magnetic core and an enameled wire; the enameled wire is wound on the magnetic core.

The utility model provides a pair of prevent voltage transformer of iron core multiple spot ground connection installs the earth current coil at iron core earth connection position, can effectively monitor iron core earth current, when voltage transformer iron core multiple spot ground connection, in time changes the maintenance. The voltage transformer is safer to operate, and the voltage transformer burnout accident caused by iron core multipoint grounding is prevented.

Drawings

Fig. 1 is the utility model provides a prevent iron core multiple spot ground connection's voltage transformer's schematic structure.

Reference numeral 1, iron core; 2. a voltage secondary coil; 3. a voltage primary coil; 4. a secondary terminal; 5. An insulating medium; 6. a ground current output terminal; 7. installing an insert; 8. a ground current coil; 9. mounting a bottom plate; 10. a secondary terminal; 11. and the iron core is grounded.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solution adopted by the present invention and the technical effect achieved by the present invention clearer, the present invention will be further described in detail with reference to the accompanying drawings and the embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the relevant portions of the present invention are shown in the drawings.

Fig. 1 is the utility model provides a prevent iron core multiple spot ground connection's voltage transformer's schematic structure. As shown in fig. 1, the embodiment of the utility model provides a prevent voltage transformer of iron core multiple spot ground connection includes: the transformer comprises an iron core 1, a voltage secondary coil 2, a voltage primary coil 3, a primary terminal 4, an insulating medium 5, a grounding current output terminal 6, an installation insert 7, a grounding current coil 8, a secondary terminal 10 and an iron core grounding wire 11.

A voltage secondary coil 2 is wound on a core column at one side of the iron core 1, the iron core 1 penetrates through the voltage primary coil 3, the voltage primary coil 3 is located at a corresponding position of the voltage secondary coil 2, and specifically, the voltage primary coil 3 is located at the outer side of the voltage secondary coil 2; the two ends of the voltage primary coil 3 are respectively connected with a primary terminal 4.

The iron core 1 is connected with the installation insert 7 through an iron core grounding wire 11; the iron core grounding wire 11 penetrates through the grounding current coil 8, and two ends of the grounding current coil 8 are respectively connected with the grounding current output terminal 6; the grounding current output terminal 6 can be connected with a digital ammeter and a control system, is used for displaying the grounding current of the iron core and prompting the magnitude of the grounding current, and the control system can be provided with an alarm device for alarming when the grounding current exceeds a threshold value.

The iron core 1, the voltage secondary coil 2, the voltage primary coil 3, the primary terminal 4, the grounding current output terminal 6, the installation insert 7, the secondary terminal 10 and the iron core grounding wire 11 are cast into a whole through the insulating medium 5.

The insulating medium 5 is epoxy resin. And a mounting bottom plate 9 is arranged at the bottom of the insulating medium 5. The mounting base 9 is connected to the mounting insert 7.

The grounding current coil 8 comprises an annular magnetic core and an enameled wire; the enameled wire is wound on the magnetic core. The basic elements of the grounding current coil 8 are a magnetic core and an enameled wire, which have the characteristic of monitoring current with high precision. The current ratio is 5A/10mA, and the iron core grounding current is output to the digital ammeter through a grounding current output terminal 6. The grounding current coil 8 is not in direct contact with the iron core grounding wire 11, and has no influence on an iron core grounding loop.

The working principle of the voltage transformer for preventing the iron core from being grounded at multiple points provided by the embodiment is as follows: and a grounding current coil 8 is arranged at the grounding wire part of the iron core of the voltage transformer and is mainly used for monitoring the grounding current of the iron core of the voltage transformer. When the iron core of the voltage transformer is grounded at multiple points, main magnetic flux in the iron core 1 penetrates through a closed loop formed between the iron core 1 and the multiple grounding points to generate circulating current, the grounding current of the iron core is obviously increased, the magnetic core in a grounding current coil 8 generates magnetic flux, current is induced in the coil, and iron core grounding current with a certain proportion is output to a digital ammeter and a control system through a grounding current output terminal 6, so that operation and inspection personnel can find and eliminate faults in time, and the occurrence of voltage transformer burnout accidents is avoided.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: it is to be understood that modifications may be made to the technical solutions described in the foregoing embodiments, or some or all of the technical features may be equivalently replaced, without substantially departing from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. The utility model provides a prevent iron core multiple spot ground connection's voltage transformer which characterized in that includes: the transformer comprises an iron core (1), a voltage secondary coil (2), a voltage primary coil (3), a primary terminal (4), an insulating medium (5), a grounding current output terminal (6), an installation insert (7), a grounding current coil (8), a secondary terminal (10) and an iron core grounding wire (11);

2. The iron core multipoint earthing proof voltage transformer according to claim 1, characterized in that said insulating medium (5) is epoxy resin.

3. The iron core multipoint earthing proof voltage transformer according to claim 1 or 2, characterized in that the bottom of the insulating medium (5) is provided with a mounting bottom plate (9).

4. The iron core multipoint earthing proof voltage transformer according to claim 3, characterized in that the mounting base plate (9) is connected with the mounting insert (7).

5. The iron core multipoint earthing proof voltage transformer according to claim 1, characterized in that said earthing current coil (8) comprises a ring-shaped magnetic core and an enameled wire; the enameled wire is wound on the magnetic core.