CN217879283U

CN217879283U - Test device for fixing cabinet

Info

Publication number: CN217879283U
Application number: CN202220911551.3U
Authority: CN
Inventors: 盛江; 汤泉清; 李博文; 杨飞雨; 赵文军; 吴世颖; 王沛
Original assignee: Zhejiang Titan Design & Engineering Co ltd
Current assignee: Zhejiang Titan Design & Engineering Co ltd
Priority date: 2022-04-20
Filing date: 2022-04-20
Publication date: 2022-11-22
Anticipated expiration: 2032-04-20

Abstract

The utility model discloses a test device for stationary cabinet, including fixed casing to and inside three-phase air circuit breaker (QF), air circuit breaker auxiliary contact (QF-OF), ac contactor (KM), thermorelay (KH), fuse (FU), signal lamp (HR, HG), stop button (SS), start button (SF), test button (SA); the primary circuit side is connected with a three-phase air circuit breaker (QF), an alternating current contactor (KM) and a thermal relay (KH) through a power supply end; the secondary circuit side test end is connected with the upper end of an electric three-phase air circuit breaker (QF), and the main control end is connected with the lower end of the electric three-phase air circuit breaker (QF). This application closes and sets up experimental button through two air circuit breaker auxiliary contact (QF-OF) closeouts OF three-phase air circuit breaker (QF), can be used to the fixed cabinet secondary circuit experimental and prevent that the secondary is experimental and lead to a start-up accident, solves the fixed cabinet experimental problem.

Description

Test device for fixing cabinet

Technical Field

The utility model belongs to the distribution safety field of mill relates to a distribution system's of mill safety improvement, concretely relates to test device for stationary cabinet.

Background

The low-voltage distribution cabinet of mill mainly adopts two kinds of cabinet types at present, one kind is the drawer type, another kind is fixed, the drawer cabinet utilizes the fine secondary circuit test problem of having solved of auxiliary contact of drawer, nevertheless the stationary cabinet is because there is not drawer auxiliary contact, can't solve the secondary circuit always experimental and experimental start and produce the safe risk problem that leads to once, for preventing the secondary test and lead to once starting the problem, the mill often demolishs the wiring of a return circuit before the secondary test, nevertheless this kind of mode can lead to following problem:

1) The workload of primary circuit disconnection and debugging is increased, and potential safety hazards are brought;

2) The mill often takes place that the debugging of secondary circuit finishes, and the phase connects conversely when once the return circuit is worked a telephone switchboard again, leads to the motor reversal, brings very big potential safety hazard.

SUMMERY OF THE UTILITY MODEL

To the above problem, the utility model provides a test device for stationary cabinet solves the problem of the safety problem that the tradition produced and increase debugging work load in stationary cabinet debugging process.

In order to realize the purpose, the utility model discloses the technical scheme who takes does:

a test device for a fixed cabinet comprises a fixed shell, and a three-phase air circuit breaker, an air circuit breaker auxiliary contact, an alternating current contactor, a thermal relay, a fuse, a signal lamp, a stop button, a start button and a test button which are arranged in the fixed shell; the connecting circuit comprises a primary circuit and a secondary circuit, the primary circuit side adopts 380V power supply, and a power supply end is sequentially connected with a three-phase air circuit breaker, an alternating current contactor and a thermal relay; the secondary circuit side adopts single-phase 220V power supply, divide into the test end and the main control end of parallel connection control, test end electricity three-phase air circuit breaker upper end, test end are connected with test button, and main control end wiring three-phase air circuit breaker's lower extreme, main control end and test button link to each other with air circuit breaker auxiliary contact respectively.

As a further technical solution, the three-phase air circuit breaker is provided with 2 auxiliary contacts of the air circuit breaker, one is a normally open contact, and the other is a normally closed contact.

As a further technical scheme, the main control end is connected with a normally open contact of an auxiliary contact of the air circuit breaker, and the test end is connected with a normally closed contact of the auxiliary contact of the air circuit breaker after being connected with the test button.

As further technical scheme, the fuse sets up behind air circuit breaker auxiliary contact, connects gradually normally closed stop button, normally open start button, electrothermal relay and ac contactor coil after the fuse and constitutes the return circuit, and normally open ac contactor switch sets up with normally open start button is parallelly connected, and the operation signal lamp sets up with the ac contactor coil is parallelly connected, and normally closed ac contactor switch connects in parallel on the secondary circuit jointly after establishing ties with the stop signal lamp.

As a further technical scheme, the test button adopts a locking button or a change-over switch and has two-gear functions.

As a further technical scheme, a test button is arranged below each knife switch of the fixed cabinet, and one test button is simultaneously used for a plurality of loops.

The utility model discloses technical scheme has following beneficial effect:

(1) The debugging problem of the secondary loop is solved well;

(2) The starting accident outside the primary loop caused by the secondary loop test is effectively avoided;

(3) The problem that the motor is reversed due to the fact that the phase is reversed when the primary loop is re-wired after the secondary loop is debugged is effectively solved.

Drawings

FIG. 1 is a schematic diagram of a primary loop of a testing device for a stationary cabinet according to the present invention;

fig. 2 is the utility model discloses a secondary circuit schematic diagram for fixed cabinet's test device.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the disclosed embodiments are merely exemplary of the invention, and are not intended to limit the invention to the precise embodiments disclosed. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1 and fig. 2, a testing device for a fixed cabinet comprises a fixed housing, and a three-phase air circuit breaker QF, an air circuit breaker auxiliary contact QF-OF, an alternating current contactor KM, a thermal relay KH, a fuse FU, a stop signal lamp HR, an operation signal lamp HG, a stop button SS, a start button SF and a test button SA which are arranged inside the fixed housing; the connection relation comprises a primary loop and a secondary loop, the primary loop is powered by 380V, and a power supply end is sequentially connected with a three-phase air breaker QF, an alternating current contactor KM and a thermal relay KH; the secondary circuit side adopts single-phase 220V power supply, divide into test end and main control end, test end connection electricity three-phase air circuit breaker QF upper end, main control end wiring three-phase air circuit breaker QF's lower extreme. The three-phase air circuit breaker QF is provided with 2 air circuit breaker auxiliary contacts QF-OF, one is a normally open contact, and the other is a normally closed contact; the main control end is connected with a normally open contact OF an auxiliary contact QF-OF OF the air circuit breaker, and the test end is connected with a normally closed contact OF the auxiliary contact QF-OF OF the air circuit breaker after being connected with the test button SA.

The main control loop is firstly connected with a normally open air circuit breaker auxiliary contact QF-OF OF the three-phase air circuit breaker QF, the test loop is smoothly connected with a test button SA and the normally closed air circuit breaker auxiliary contact QF-OF, and the test loop is sequentially connected with a fuse FU, a stop button SS, a start button SF, a thermal relay KH, an alternating current contactor KM coil, signal lamps HR and HG after being connected with the main control loop in parallel.

Specifically, fuse FU sets up after air circuit breaker auxiliary contact QF-OF, has connected gradually behind the fuse FU normally closed shut down button SS, normally open start button SF, thermal relay KH and ac contactor KM coil and constitutes the return circuit, and normally open ac contactor KM switch sets up with normally open start button SF is parallelly connected, and operation signal lamp HG sets up with ac contactor KM coil is parallelly connected, and normally closed ac contactor KM switch connects in parallel on the secondary circuit jointly after establishing ties with the signal lamp HR that stops.

The utility model discloses a test button SA adopts blocked button or change over switch, has two grades of functions. One test button SA is installed under each knife switch of the stationary cabinet, one test button SA being used for multiple circuits at the same time.

During testing, the three-phase air circuit breaker QF is opened (the QF switch is not switched on during normal testing), the normally-opened auxiliary contact QF-OF OF the three-phase air circuit breaker QF is opened, the primary circuit is powered off, the secondary main control circuit is powered off, the normally-closed auxiliary contact QF-OF OF the three-phase air circuit breaker QF is closed, the test button SA is punched to the testing side, and the secondary circuit is powered on.

When the test button SA is closed or not, the test side power supply is not connected to the main control loop.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A test device for a fixed cabinet is characterized by comprising a fixed shell, and a three-phase air circuit breaker (QF), an air circuit breaker auxiliary contact (QF-OF), an alternating current contactor (KM), a thermal relay (KH), a Fuse (FU), an operation signal lamp (HG), a stop signal lamp (HR), a stop button (SS), a start button (SF) and a test button (SA) which are arranged inside the fixed shell; the connecting loop comprises a primary loop and a secondary loop, the primary loop is powered by 380V, and a power supply end is sequentially connected with a three-phase air circuit breaker (QF), an alternating current contactor (KM) and a thermal relay (KH); the secondary circuit side adopts single-phase 220V power supply and is divided into a test end and a main control end which are connected in parallel and controlled, the test end is connected with the upper end OF an electric three-phase air circuit breaker (QF), the test end is connected with a test button (SA), the main control end is connected with the lower end OF the three-phase air circuit breaker (QF), and the main control end and the test button (SA) are respectively connected with an auxiliary contact (QF-OF) OF the air circuit breaker.

2. Testing device for stationary cabinets according to claim 1, characterized in that the three-phase air circuit breaker (QF) is equipped with 2 air circuit breaker auxiliary contacts (QF-OF), one being normally open and one being normally closed.

3. The testing device for the fixed cabinet according to claim 2, wherein the main control end is connected with a normally open contact OF an auxiliary contact (QF-OF) OF the air circuit breaker, and the testing end is connected with a normally closed contact OF the auxiliary contact (QF-OF) OF the air circuit breaker after being connected with the testing button (SA).

4. The testing device for the stationary cabinet according to claim 3, wherein the Fuse (FU) is arranged behind the auxiliary contact (QF-OF) OF the air circuit breaker, a normally closed stop button (SS), a normally open start button (SF), a thermal relay (KH) and an AC contactor coil are connected behind the Fuse (FU) in sequence to form a loop, a normally open AC contactor (KM) switch is arranged in parallel with the normally open start button (SF), a running signal lamp (HG) is arranged in parallel with the AC contactor coil, and the normally closed AC contactor (KM) switch is connected in series with the stop signal lamp (HR) and then connected in parallel with a secondary loop.

5. A test device for stationary cabinets according to claim 1, characterized in that the test button (SA) is a latching button or a switch, with two-position functionality.

6. A test device for a stationary cabinet according to claim 3, characterized in that one test button (SA) is mounted under each knife switch of the stationary cabinet, one test button (SA) being used for multiple circuits at the same time.