CN218848283U

CN218848283U - Current checking table

Info

Publication number: CN218848283U
Application number: CN202222193015.7U
Authority: CN
Inventors: 徐汉杰; 朱伟锴; 魏兴华; 沈成龙; 游正奎
Original assignee: Tongkun Group Co Ltd
Current assignee: Tongkun Group Co Ltd
Priority date: 2022-08-19
Filing date: 2022-08-19
Publication date: 2023-04-11
Anticipated expiration: 2032-08-19

Abstract

The utility model discloses a current calibration stand, which comprises a tested electric appliance, a power supply, a power switch, a voltage regulator, an ammeter and a transformer; the utility model discloses a transformer, including power, switch, silicon controlled rectifier voltage regulator, ammeter, power supply one end and switch one end electricity are connected, the switch other end is connected with silicon controlled rectifier voltage regulator one end electricity, the silicon controlled rectifier voltage regulator other end is connected with 1 foot electricity of transformer, 2 feet and the ampere meter one end electricity of transformer are connected, the ampere meter other end is connected with electrical apparatus one end electricity under test, the electrical apparatus other end is connected with 3 feet electricity of transformer under test. The utility model discloses a current check table simple structure, convenient to use through providing accurate current value, when being surveyed electrical apparatus dropout or when not tripping in the time of regulation, compares general circuit breaker, thermorelay's time-current characteristic, whether relatively both conform to judge whether qualified by the electrical apparatus of being surveyed.

Description

Current checking table

Technical Field

The utility model relates to an electrical apparatus calibration equipment technical field, concretely relates to electric current calibration stand.

Background

In industrial production, a circuit breaker and a thermal relay need to be checked regularly, and in order to check whether tripping protection current and setting current of the circuit breaker and the thermal relay are consistent, an instrument capable of generating corresponding current is needed to check the quality of the electrical protection elements. When current passes through the circuit breaker, the electromagnetic force of an electromagnetic coil in the circuit breaker is increased, the electromagnetic force is increased, and when the current is large enough, the electromagnetic force drives a tripping mechanism to act to open the circuit breaker; when the current flows through the bimetallic thermal elements of the circuit breaker and the thermal relay, the bimetallic strip is bent and deformed, when the current reaches a certain value and the duration time reaches a certain time, the bimetallic strip pushes the thermal tripping connecting rod to act, so that the circuit breaker and the thermal relay control circuit are disconnected, the power supply is disconnected, and the overload protection effect is achieved.

The circuit breaker and the thermal relay are used for protecting the safety of electric equipment, and when the equipment is overloaded and short-circuited, the circuit breaker or the thermal relay can be accurately tripped and cut off to play a role in protection. However, the circuit breaker and the thermal relay have no self-checking capability and cannot be checked on site if the protectors are accurate.

Based on the circumstances, the utility model provides an electric current check-up platform can effectively solve more than one or multiple problem.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a current check table. The utility model discloses a current check table simple structure, convenient to use through providing accurate current value, when being surveyed electrical apparatus dropout or when not tripping in the time of regulation, compares general circuit breaker, thermorelay's time-current characteristic, whether relatively both conform to judge whether qualified by the electrical apparatus of being surveyed.

The utility model discloses a following technical scheme realizes:

a current calibration stand comprises a tested electric appliance, a power supply, a power switch, a voltage regulator, an ammeter and a transformer;

the power one end is connected with switch one end electricity, the switch other end is connected with silicon controlled rectifier one end electricity, the silicon controlled rectifier other end is connected with the a foot electricity of transformer, the b foot and the ampere meter one end electricity of transformer are connected, the ampere meter other end is connected with the electrical apparatus one end electricity of being surveyed, the electrical apparatus other end is connected with the c foot electricity of transformer of being surveyed.

Preferably, the voltage regulator is a thyristor voltage regulator.

Preferably, the measurement range of the ammeter is 0 to 600A.

Preferably, the regulating range of the voltage regulator is 0-220 VAC.

Preferably, the power supply is a single phase 220VAC power supply.

Compared with the prior art, the utility model, following advantage and beneficial effect have:

the utility model discloses a current check table simple structure, convenient to use through providing accurate current value, when being surveyed electrical apparatus dropout or when not tripping in the time of regulation, compares general circuit breaker, thermorelay's time-current characteristic, whether relatively both conform to judge whether qualified by the electrical apparatus of being surveyed.

Drawings

Fig. 1 is a schematic circuit diagram of the present invention.

Detailed Description

In order to make the technical solution of the present invention better understood by those skilled in the art, the following description of the preferred embodiments of the present invention is given with reference to the accompanying examples, but it should be understood that the drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.

The present invention relates to a thyristor voltage regulator, an ammeter, a transformer, etc. (the components of the present invention) which are obtained from conventional commercial approaches or manufactured by conventional methods if there is no special description, and the specific structure, operation principle, control method and space arrangement method thereof are all selected by conventional methods in the field, and should not be regarded as the innovation point of the present invention, which can be understood by those skilled in the art, and the present invention does not provide further detailed development.

Example 1:

as shown in fig. 1, the utility model provides a current calibration stand, which comprises a tested electric appliance 1, a power supply, a power switch 2, a voltage regulator 3, an ammeter 4 and a transformer 5;

the utility model discloses a transformer, including power supply, switch 2, silicon controlled rectifier voltage regulator, ammeter 4, power supply one end and switch 2 one end electricity are connected, the 2 other ends of switch are connected with 3 one end electricity of silicon controlled rectifier voltage regulator, the 3 other ends of silicon controlled rectifier voltage regulator are connected with transformer 5's a foot electricity, transformer 5's b foot is connected with 4 one end electricity of ammeter, the 4 other ends of ammeter are connected with the 1 one end electricity of electrical apparatus under test, the electrical apparatus under test 1 other end is connected with transformer 5's c foot electricity.

A voltage regulator 3 is connected to the primary winding of a transformer 5, a potentiometer provided by the voltage regulator 3 generates 0-220 AC voltage at the output end, and the AC voltage is loaded on the primary winding of the transformer 5; and 5 turns of flat copper sheets are wound in the gap of the secondary winding of the transformer 5, one end of an outgoing line is connected with the ammeter 4, the other end of the outgoing line is connected with the output end of the tested electric appliance 1, and the outgoing line end of the ammeter 4 is connected with the input end of the tested electric appliance 1.

During wiring, the sectional area of the connecting conductor is ensured to be large enough, and good contact is ensured. If the current is not large enough, the sectional area of the wire is increased according to a wire resistance formula, and the length of the wire is shortened as much as possible to reduce the loop resistance.

During testing, the power switch 2 is pressed down, the potentiometer is adjusted to enable the reading of the ammeter 4 to reach a required value, the power switch 2 is disconnected, the power switch 2 is cooled for a few minutes, timing is started at the same time, the testing result is compared with the time-current characteristics of a general breaker and a general thermal relay, when the testing result meets the requirements of the table 1, a point is tested again, when the characteristics of all points meet the requirements of the table 1, the electric appliance is judged to be qualified, and otherwise, the electric appliance is not qualified.

Further, in another embodiment, the voltage regulator 3 is a thyristor voltage regulator 3.

Further, in another embodiment, the measuring range of the ammeter 4 is 0 to 600A.

Further, in another embodiment, the regulating range of the voltage regulator 3 is 0 to 220VAC.

Further, in another embodiment, the power source is a single phase 220VAC power source.

TABLE 1 time-current characteristics of circuit breaker, thermorelay

The utility model discloses a theory of operation of an embodiment as follows:

a single-phase 220VAC power supply is connected to a silicon controlled voltage regulator 3 through a power switch 2, a potentiometer is arranged on the voltage regulator 3 and used for adjusting the output voltage of the voltage regulator 3, the adjusting range is 0-220 VAC, the voltage is loaded on a primary winding of a transformer 5, 0-1000A current is output corresponding to a secondary side of the transformer 5, the potentiometer of the voltage regulator 3 is adjusted according to the current value of a tested electric appliance 1, the current is connected to a main contact of the tested electric appliance 1, timing is started simultaneously after the power switch 2 is switched on, when the tested electric appliance 1 is tripped or not tripped within a specified time, time-current characteristics of a universal circuit breaker and a thermal relay are compared, whether the current protection of the tested electric appliance 1 at the point is qualified or not can be judged, other current points can be checked, when all the current points are qualified, the short-circuit protection and overload protection of the tested electric appliance 1 can be judged to be qualified, and otherwise, the short-circuit protection and overload protection of the tested electric appliance 1 are not qualified.

According to the description and drawings of the present invention, the current verification station of the present invention can be easily manufactured or used by those skilled in the art, and the positive effects described in the present invention can be produced.

Unless otherwise specified, in the present invention, if the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for the convenience of description and simplification of the description, but it does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore the terms describing the orientation or positional relationship in the present invention are only used for illustrative purposes and are not to be construed as limiting the present patent, and it is possible for a person having ordinary skill in the art to understand the specific meaning of the above terms according to the specific circumstances in conjunction with the drawings.

Unless expressly stated or limited otherwise, the terms "disposed," "connected," and "connected" are used broadly in the present disclosure and encompass, for example, either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention in any form, and all the technical matters of the present invention are all within the protection scope of the present invention for any simple modification and equivalent change of the above embodiments.

Claims

1. The utility model provides a current check table, includes the electrical apparatus that is surveyed, its characterized in that: comprises a power supply, a power switch, a voltage regulator, an ammeter and a transformer;

2. The current verifier stage of claim 1, wherein: the voltage regulator is a silicon controlled rectifier voltage regulator.

3. The current verifier stage of claim 1, wherein: the measuring range of the ammeter is 0-600A.

4. The current verifier stage of claim 1, wherein: the regulating range of the voltage regulator is 0-220 VAC.

5. The current verifier stage of claim 1, wherein: the power supply is a single phase 220VAC power supply.