CN203787831U - Drawer circuit test power supply - Google Patents

Abstract

The utility model discloses a drawer return circuit test power for contactor combined floodgate and separating brake in the drawer return circuit are experimental, adopt contactor control circuit to select from the outside main bus of drawer return circuit, and it is experimental with separating brake to supply the contactor combined floodgate in the external command control drawer return circuit, and the normal operating of drawer return circuit at operating position can not be influenced in the selection of experimental power moreover.

Description

Drawer circuit test power supply

technical field

The utility model relates to the field of switch cabinets, in particular to a drawer circuit test power supply. the

Background technique

In the 400V switchgear technical agreement, it is common for the switchgear to provide test power for the drawer circuit, but the actual design institute often ignores this requirement when designing the secondary control diagram. Then, how to obtain the test power for the drawer circuit, how to meet the test requirements, and achieve What configuration is required for this requirement is a problem that switch cabinet designers need to consider in detail. the

Utility model content

In order to solve the above technical problems, the technical problem to be solved by the utility model is to provide a drawer circuit test power supply. the

The technical scheme that the utility model adopts is:

The drawer circuit test power supply is used for the closing and opening tests of the contactor in the drawer circuit. It is characterized in that:

The test power is obtained from the main circuit between the 380/220V power distribution device and the local control cabinet, and the A-phase, B-phase, C-phase and N-phase wiring of the 380/220V power distribution Terminals are electrically connected. In the A-phase, B-phase, and C-phase wiring, the wiring positions of the primary plug-ins on the incoming line side and the normal Open contact, contactor normally open main contact, wiring position of the primary plug-in on the outlet side;

The test power supply also includes a contactor control circuit, the contactor control circuit includes a test branch, a working branch, and a normally open auxiliary contact of the contactor connected in series with the test branch and the working branch, the contactor coil, the outgoing line The wiring position of the secondary plug-in on the side; the test branch is composed of a second miniature circuit breaker and a drawer test position travel switch in series, and the second miniature circuit breaker is connected to one of the phases on the incoming line side of the normally open main contact of the contactor. The working branch is connected in series by the secondary plug-in wiring position on the incoming line side, the first miniature circuit breaker and the travel switch at the working position of the drawer. The front end of the secondary plug-in wiring position on the incoming line side is connected to the 380/220V power distribution One of the phase connections between the device and the primary plug-in wiring position on the incoming line side; the normally open auxiliary contact of the contactor is connected in parallel with the closing contact of the drawer circuit, and the contactor coil and the normally open auxiliary contact of the contactor are connected in parallel. The opening contact of the drawer circuit is connected in series between them; the wiring position of the secondary plug-in on the outlet side is connected to the N-phase wiring.

The beneficial effects of the utility model:

The test power supply of the drawer circuit of the utility model adopts the contactor control circuit to select from the main bus bar outside the drawer circuit for external command control of the contactor closing and opening tests in the drawer circuit, and the selection of the test power supply will not affect the drawer circuit. Normal operation of the work position.

Description of drawings

Below in conjunction with accompanying drawing, the specific embodiment of the present utility model is described further. the

Fig. 1 is the schematic diagram of the utility model drawer circuit test power supply. the

Detailed ways

Referring to Fig. 1, it is a drawer circuit test power supply of the present invention, which is used for the closing and opening tests of the contactor in the drawer circuit. the

Generally, the drawer circuit has three positions of extraction, test and work. For the MNSG cabinet, these three positions are controlled by the handle on the measurement and control board of the large interlocking mechanism of the drawer during the actual operation process. The large interlocking mechanism allows the configuration of test, The auxiliary switch of the working position, and the withdrawing position is not very meaningful for the control circuit of the drawer, so it is ignored in this technical solution, and the test position and working position of the drawer are exactly the place where the drawer can provide the test power supply mentioned above. The configuration is required. the

In this technical solution, a single contactor control circuit 100 is used to represent the scheme that the drawer obtains the test power supply. The test power supply is obtained from the main circuit between the 380/220V power distribution device 200 and the local control cabinet 300, and the 380/220V power distribution The A-phase, B-phase, C-phase, and N-phase wiring of the device 200 is electrically connected to the incoming line terminal of the local control cabinet 300, and a 380/220V power distribution device is installed in the A-phase, B-phase, and C-phase wiring. 200 to the local control cabinet 300 connected in series to the wiring position of the primary plug-in 400 on the incoming line side, the normally open contact of the molded case circuit breaker ZKK, the normally open main contact of the contactor C, and the wiring position of the primary plug-in 500 on the outgoing line side ;

The contactor control circuit 100 of the test power supply includes a test branch 101, a working branch 102, and a contactor normally open auxiliary contact C, a contactor coil C, and an outlet side connected in series with the test branch 101 and the working branch 102. The wiring position of the secondary plug-in 600; the test branch 101 is formed by the second miniature circuit breaker 2DK and the drawer test position travel switch SW connected in series, and the second miniature circuit breaker 2DK and the normally open main contact of the contactor enter the line The A-phase line on the side is connected, and the connection point is ~ A; the working branch 102 is formed in series by the connection position of the secondary plug-in 700 on the incoming line side, the first miniature circuit breaker 1DK and the drawer working position travel switch YW. The front end of the wiring position of the secondary plug-in 700 on the incoming line side is connected to the A-phase wiring between the 380/220V power distribution device 200 and the wiring position of the primary plug-in 700 on the incoming line side, and the connection point is ~A1; the normally open auxiliary contactor of the contactor Point C is connected in parallel with the closing contact KJ of the drawer circuit, and the opening contact KJ of the drawer circuit is connected in series between the contactor coil C and the normally open auxiliary contact C of the contactor; the outlet side secondary plug-in 600 The wiring bit is connected to the N-phase wiring.

Its working principle is: when the drawer is in the test position, the primary plug-in 400 and 500 are not connected, but only the secondary plug-in 600 and 700 are connected, that is, there is no power in the drawer. At this time, the test power needs to be selected from the main bus outside the drawer, that is, select ~A, while the SW is in the on state at this time, after the 2DK miniature circuit breaker is closed, the main bus power supply is obtained as the test power supply of the drawer, and the drawer can realize the closing and opening test work of the contactor at the test position in this way. And when the drawer is pushed to the working position after passing the test, the SW contact is disconnected and the YW contact is connected. At this time, the primary plug-in in the circuit is connected. If the main switch ZKK in the circuit is closed, the incoming side of the contactor is charged. Combined with 1DK miniature circuit breaker, the control circuit obtains ~A1 power supply (the N side of the power supply is not controlled, and it is connected at the test position and the working position), so that the primary and secondary circuits work normally. the

As mentioned above, the test power supply of the drawer circuit of the utility model adopts the contactor control circuit to select from the main bus bar outside the drawer circuit for external commands to control the closing and opening tests of the contactor in the drawer circuit, and the selection of the test power supply will not Affect the normal operation of the drawer circuit in the working position. the

The above is only the preferred implementation of the utility model, the utility model is not limited to the above implementation, as long as the technical solutions to achieve the purpose of the utility model by basically the same means are within the scope of protection of the utility model. the

Claims (2)

1. drawer loop experiment power supply, closes a floodgate and a minute brake test for the contactor of drawer loop, it is characterized in that:

This experiment power supply is by obtaining on the major loop between 380/220V power distribution equipment and on-site control, the end of incoming cables of the A phase of 380/220V power distribution equipment, B phase, C phase, N phase connection and on-site control is electrically connected, and is provided with the wiring position of a plug-in unit of inlet wire side that is connected in series successively from 380/220V power distribution equipment to on-site control, the wiring position that the normally opened contact of breaker of plastic casing, contactor are often opened main contacts, a plug-in unit of outgoing line side in A phase, B phase, C phase connection;

This experiment power supply also comprises a contactor control loop, this contactor control loop comprises test branch road, work branch, and the contactor of simultaneously connecting with test branch road, the work branch wiring position of often opening auxiliary contact, contactor coil, outgoing line side secondary inserting piece; Route the second miniature circuit breaker is propped up in described test and stroke switch series connection in drawer test position forms, and described the second miniature circuit breaker is connected with the wherein phase line that main contacts inlet wire side often left by contactor; Described work branch is in series by inlet wire side secondary inserting piece wiring position, the first miniature circuit breaker and drawer service position travel switch, and the front end of described inlet wire side secondary inserting piece wiring position connects the wherein phase connection between 380/220V power distribution equipment and plug-in unit wiring position of inlet wire side; It is in parallel with the closing contact of drawer loop that described contactor is often driven auxiliary contact, and described contactor coil and tentaculum are often opened the separating brake contact that is in series with drawer loop between auxiliary contact; The wiring position of described outgoing line side secondary inserting piece is connected with N phase connection.

2. drawer loop experiment power supply according to claim 1, it is characterized in that: described the second miniature circuit breaker is connected with the A phase line that main contacts inlet wire side often left by contactor, the front end of described inlet wire side secondary inserting piece wiring position connects the A phase connection between 380/220V power distribution equipment and plug-in unit wiring position of inlet wire side.