JPH06101280B2 - Interlock function box for medium voltage equipment - Google Patents

Abstract

The invention relates to a functional locking cabinet for a medium tension switchgear. Functional locking cabinet for a medium tension switchgear comprising, within a casing closed by an access panel, at least one switch, a ground isolator and a mechanism for operating these systems, said mechanism comprising for each one of the systems a shaft which can adopt in rotation two given angular positions corresponding respectively to the open-circuit or closed-circuit condition of the system, each shaft being equipped with a disc equipped with a slot, the position of which corresponds to the open-circuit or closed- circuit condition of the system with which it is associated, said cabinet being characterised in that it comprises a first lock (3) which can be moved into two positions, a second lock (5) having two positions and two levers (6, 7) for driving the locks. Application: medium tension switchgear.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises an armoir containing a medium voltage interrupter and a sectionneur de terre.
e) Regarding the interlock function box for medium voltage equipment. Here, the circuit breaker is a switch for disconnecting the circuit from the voltage when it is opened, and the earth switch is
A mechanical switch for grounding parts of the circuit when it is closed.

An object of the present invention is to provide a function box capable of executing a certain function, permitting a certain operation and prohibiting another operation.

As described above, when the box of the present invention is used, the earth switch can be closed only when the breaker is opened, the earth switch is prohibited when the breaker is closed, and the earth switch is closed when the earth switch is closed. Prohibit closing the circuit breaker,
A panel for inspecting the medium voltage chamber only when the earth switch is closed (hereinafter, simply referred to as "inspection panel (panneau d'acc
The opening of the earth switch must be prohibited when the inspection panel is opened.

Similarly, during the cable test operation, the box of the present invention allows the installation and removal of the test device only when the earth switch is closed, and prohibits the closing of the circuit breaker after the earth switch is opened to perform the test. Access to the cable head inside must be prohibited.

The present invention provides an interlock function box for medium-voltage equipment, which includes at least a circuit breaker, a ground switch, and an operation mechanism for these in the box. The box is closed by an inspection panel, and the circuit breaker and earth switch are operable from the outside with the box closed. The inspection panel can only be opened when the earthing switch is closed so that no one can inadvertently open it and be harmed by the medium voltage equipment inside.

The operating mechanism is provided with shafts that can be rotated by two predetermined angular positions corresponding to the open state and the closed state of the circuit breaker and the earth switch, respectively. Each shaft is equipped with a disk whose position corresponds to the open or closed state of the circuit breaker or earthing switch to which the shaft is associated. The box cooperates with an open state or a closed state of the disk to allow the closing of the earthing switch only when the circuit breaker is opened, and prohibits the closing of the circuit breaker when the earthing switch is closed. A movable first locking mechanism, a second locking mechanism having a first position and a second position that can be locked by a locking means that operates when the earth switch is opened, and a second locking mechanism that is driven by the first locking mechanism and is on the panel. A first lever having a locked first position for the first receiving member and a second position for unlocking the first receiving member cooperating with a first latch head member provided;
A second lever for driving the second locking mechanism and abutting a second receiving member cooperating with a second latch head member of the panel, the translational movement of the panel in its plane Releasing the second latch head member from the second receiving member, the movement of the second receiving member moves the second locking mechanism, and the locking mechanism is coupled with the locking means to inhibit the opening of the earth switch; The first and second levers are connected by a first spring for moving the levers closer to each other, and the first and second receiving members are connected by a spring for maintaining the receiving member at the escape position of the latch head member. ing.

The present invention will be better understood from the following description of preferred embodiments of the invention with reference to the accompanying drawings.

In FIG. 1, a rectangle M illustrates the operating mechanism of the circuit breaker and the earth switch. The operation of these devices (circuit breaker and earth switch) is performed by rotation of shafts 1 and 2 to which the disks 1A and 2A are fixed, respectively. These axes 1 and 2 can be operated from outside the box. The disc 1A fixed to the operating shaft 1 of the circuit breaker is the cutting portion 1B.
Is included.

In FIG. 1, the circuit breaker is in the open position and the break is in the position shown (fourth quadrant). When the circuit breaker is closed, the shaft rotates 180 degrees in the direction of arrow f1 and the cutting portion comes to position 1'B (second quadrant) shown by the dotted line in the drawing.

Disk 2A fixed to the operation shaft 2 of the earth switch
Has a cutting portion 2B. In Figure 1, the ground switch is in the open position and the disconnect is in the position shown (3rd quadrant).
It is in.

When the earth switch is closed, the shaft rotates 180 degrees in the direction of arrow f2, and the cut portion is at position 2'B (first quadrant) shown by the dotted line.
I come to.

The rod-shaped lock mechanism 3 can lock the rotation of either the disc 1A or 2A when the end of the rod-shaped lock mechanism 3 is fitted into the cut portion.
It may translate between two positions along its largest dimension.

In FIG. 1, the lock mechanism 3 is fitted to the cut portion 2B of the disc 2A. This is the rest position of the mechanism.

The disc 2A carries a projection 2C which cooperates with a lever 4 which rotates around an axis 4B and which is pulled in the direction of the projection by a spring 4C.

When the earth switch is closed, the lever 4 cooperates with the protrusion 2C to prevent the shaft 2A from rotating in the direction of the arrow f'2 opposite to the arrow f2. In this way, the operator has to actuate the lever 4 in order to release the shaft 2 before opening the earthing switch.

The axial side of the mechanism's earthing switch is complemented by a rod-shaped locking mechanism 5 which has a notch 5A and whose large dimension can be translated in parallel.

The shaft side locking mechanism 3 of the circuit breaker has a notch 3A which cooperates with a lever 6 which rotates around an axis 6A. The movement of the lock mechanism 3 causes the lever 6 to rotate. The lever 7 rotating about the axis 7A fits into the notch 5A of the locking mechanism 5 and the translational movement of the locking mechanism 5 causes the lever 7 to rotate.

The box has a substantially triangular notch 8B cooperating with the end 6B of the lever 6 and a substantially rectangular cut 8C cooperating with the latch head member 10 connected to the inspection panel 11 of the installation. It includes a receiving member 8 in the form of a shaft disk 8A. When the latch head member 10 fits into the notch of the receiving member 8 and the receiving member 8 is fixed by the lever 6, the panel 11 is closed and immobile.

On the side of the earth switch, the box is provided with a second receiving member 9 in the form of a shaft disc 9A having a chord-shaped cut 9B and a rectangular cut 9C.

When the lever 7 is fixed by the lock mechanism 5, the lever 7 inhibits the rotation of the receiving member 9.

The cutting portion 9C is a latch head member connected to the panel 11.
Receive 10A. When the latch head member is fitted into the receiving member 9 and the receiving member 9 is fixed by the lever 7, the inspection panel becomes immobile and locked.

The spring 12 connects the levers 6 and 7. The spring is secured to bring the ends of the lever closer together, the levers each cooperating with locking mechanisms 3 and 5 to maintain the locking mechanism in its rest position.

The spring 13 connects the receiving members 8 and 9 and is placed so as to rotate the receiving member 8 on the side of the circuit breaker in the direction of the clock hand and the receiving member 9 on the side of the earth switch in the direction opposite to the hand of the clock. There is.

1-Circuit breaker open, earth switch open In the configuration shown in FIG. 1, the circuit breaker is open. The protrusion 2C keeps the lever 4 in a low position, the lever 4 locks the lever 5, and the lever 5 fixes the receiving member 7 so that the panel 11 is fixed.

The locking of the panel 11 is also ensured by the lever 6 which is held in place by the spring 12 which locks the rotation of the receiving member 9 despite the action of the spring 13.

2-Circuit breaker closed, earth switch opened See Fig. 2. The closing of the circuit breaker is indicated by a 180 degree rotation of the shaft 1 and thus of the disc 1A in the direction of the arrow f1 in FIG. 1'B). The disk 2 remains locked by the lock mechanism 3 and therefore the earth switch cannot be closed. If the other parts do not move, the panel is fixed in the receiving member 9,9A by the latch head member 10,1.
It remains fixed by 0A.

3- Circuit breaker open, earth switch closed See Fig. 3. The closing of the earth switch starting from the shape of FIG. 1 is shown by a 180 degree rotation of the disk 2A in the direction of the arrow f2 of FIG. 1 and reaches the shape of FIG. The rotation of the disc 2A causes a translational movement to the left in the drawing of the locking mechanism 3, which locks the disc 1A and thus prohibits the closing of the circuit breaker. The lever 6 rotates to unlock the receiving member 8, and the receiving member 8 rotates to release the latch head member 10.

The rotation of the disk 2 further releases the lever 4, and the lever 4
Is moved up by the action of spring 4C. Lock mechanism 5
However, the lever 7 always acts on the receiving member 9, and the receiving member 9 maintains the latch head member 10A.

Therefore, the inspection panel 11 is closed and the lock is released. In this state, the inspection panel 11 is opened by moving the inspection panel 11 upward.

4-Opening the inspection panel of the medium voltage chamber When the panel 11 is moved upward (Fig. 4), the latch head member is opened.
10, 10A rotate the receiving members 8 and 9 in the fixed positions under the action of the spring 13, respectively. The receiving member 8 locks the lever 6, and the lever 6 maintains the lock mechanism 3 in a position that prohibits closing of the circuit breaker.

The receiving member 9 tilts the lever 7, and the lever 7 presses the lock mechanism 5 to inhibit the rotation of the lever 4. As a result, the ground switch cannot be opened.

5-Cable test, replacement of the inspection panel with the test panel The cable test involves opening the earth switch while maintaining the state in which the circuit breaker cannot be closed.
The inspection panel must be open to allow the passage of jacketing or connecting cables, but still access to the cable head must be impeded.

These conditions are achieved by replacing the inspection panel with a test panel (panneau d'essai) for cable testing. The test panel allows the closing of the circuit breaker while allowing the opening of the earthing switch and allows the jacket or cable to pass through at the bottom while covering the cable head at the top.

The test panel (Fig. 5) has only 10A of latch head member. The test head is drawn in a flashy color (for example, red) different from the body (post).

The test panel is shown at reference numeral 15 in FIG.

When the test panel 15 is moved downwards, the latch head member 10
A rotates the receiving member 9, and the receiving member 9 releases the lever 7. The lever 7 moves the lock mechanism 5 to the left in the drawing.

Therefore, the lever 4 is unlocked, which allows the opening of the ground switch.

The line of the receiving member 8, the lever 6, the lock mechanism 3, and the disc 1A is not affected by the installation of the panel 15, and the circuit breaker cannot be closed. In this state, the earth switch is opened and the cable test is performed.

6-Test with ground switch open See FIG. The disc 2A was rotated 180 degrees in the direction of arrow f'2 in FIG. 5 by opening the ground switch.

The disc 2A keeps the lever 4 in the low position by the protrusion 2C. The lever 4 locks the lock mechanism 5, and the lock mechanism fixes the lever 7, and the lever 7 itself prohibits the rotation of the receiving member 9.

Therefore, the test panel cannot be removed during the test performed when the earth switch is opened.

Removing the test panel 15 requires closing the ground switch.

It has become clear from the above description that the box of the invention fulfills all the safety functions necessary for the use of medium voltage installations.

[Brief description of drawings]

1 to 6 are schematic diagrams illustrating the principles of the invention in various situations that may be encountered during use or testing. 1A, 2A, 8,9 …… Disc, 1B, 1′B, 2B, 2′B, 8B, 8C, 9B, 9C
...... Cutting part, 2C …… Projection part, 3,5 …… Lock mechanism, 4,6,7
...... Lever, 4C, 12,13 …… Spring, 10,10A …… Latch head member, 11 …… Inspection panel, 15 …… Test panel.

Claims (3)

[Claims] 1. An interlock function box for medium-voltage equipment, comprising at least a circuit breaker, an earth switch, and an operating mechanism for these in a box closed by an inspection panel, wherein the operating mechanism is cut off. And earth switches each have a shaft capable of rotating two predetermined angular positions corresponding to an open state and a closed state, and each of the shafts has a position corresponding to that of the breaker or earth switch to which the shaft is associated. A box having a cutting portion corresponding to an open state or a closed state is provided, and the box cooperates with the open state or the closed state of the disk to allow the closing of the earth switch only when the breaker is opened, and A movable first locking mechanism having two positions for inhibiting the closing of the circuit breaker when the earth switch is closed, and a locking means that is activated when the first position and the earth switch are opened. A second locking mechanism having a more lockable second position, and a first locking position of the first receiving member driven by the first locking mechanism and cooperating with a first latch head member provided on the panel And a first lever having a second position for unlocking the first receiving member, and abutting a second receiving member that drives the second locking mechanism and cooperates with the second latch head member of the panel. And a second lever that becomes like this, the translational movement of the panel on the plane releases the second latch head member from the second receiving member, and the movement of the second receiving member causes the second locking mechanism. The second locking mechanism is coupled to the locking means to prohibit the opening of the earth switch, the first and second levers are connected by a first spring for bringing the levers closer, and the first and second levers are moved. Second An interlock function box for medium-voltage equipment, wherein the receiving member is connected by a spring for maintaining the receiving member at a position where the latch head member escapes. 2. The box according to claim 1, wherein said locking means comprises a third lever which cooperates with the protrusion of the disk of the earthing switch and is pulled by a spring. 3. The position where the first lever releases the first receiving member corresponds to the position of the first lock mechanism that comes into the cut portion of the disc of the circuit breaker. Box described.