CN108807039B - Interlocking device for cable room door of medium voltage switchgear - Google Patents

Abstract

The invention relates to an interlocking device for a cable room door of a medium-voltage switchgear, including a front door of the cable room, a travel switch, a program lock A, a program lock key, an interlock plate, a locking electromagnet, a charged display, and a program lock B; The locking electromagnet, program lock A and travel switch are respectively installed on the mounting plate or a closed device, and the electrification indicator is installed on the front door of the cable room to display whether the incoming line side is charged; the program lock B is installed on the back door of the switch cabinet or On the rear cover, it is used to unlock the rear door or rear cover of the switch cabinet; the connecting rod of the program lock A lock cylinder in the program lock A is fixedly connected with the interlock plate to form a linkage, and is connected with the front power supply through the travel switch contact. Interlocking; the locking electromagnet lock core connecting rod in the locking electromagnet corresponds to the interlocking plate hole on the locking plate; the program lock B lock core connecting rod in the program lock B corresponds to the cabinet body fixing plate; the program lock A program lock key can be inserted into program lock A or program lock B; the charged display is electrically connected to a locking electromagnet.

Description

Interlocking device for cable room door of medium voltage switchgear

technical field

The invention relates to a medium-voltage switchgear, in particular to an interlocking device for a door of a cable room of a medium-voltage switchgear.

Background technique

With the continuous expansion of the application range of medium-voltage switchgear and the continuous increase of application fields, the requirements for its safety are also getting higher and higher. Experience shows that a large number of misoperation accidents on medium-voltage switchgear should have been avoided, but they could not be avoided due to the imperfect interlock function, resulting in a large number of casualties and equipment damage.

When the medium voltage switchgear is used as power distribution equipment, its charged state is determined by the state of the power supply system. Existing medium-voltage switchgear generally adopts warning signs or adopts electrical interlocking methods to prevent misoperation of the switchgear cable room door or cover plate, and these two methods have certain defects and deficiencies.

Warning signs have great potential safety hazards, especially during maintenance, the operator may misuse without knowing the working status of the on-site power distribution device or when the power supply system is still supplying power, and the switchgear cable room door or cover plate Forcibly opened, which poses a greater threat to personal safety; the door or cover plate of the medium-voltage switchgear adopts electrical interlocking, and the potential safety hazards mainly come from the relatively low reliability of electrical interlocking or the ineffective interlocking function. Complete. Electrical interlocks often fail due to damage to electrical components or line failures, which brings potential safety hazards.

In order to avoid unnecessary personal casualties and equipment damage, it is necessary to design an interlocking device for the cable room door of the medium voltage switchgear.

Contents of the invention

In order to make the interlock of the medium voltage switchgear more reliable, to ensure that during maintenance and overhaul, the situation of electrification of the equipment due to misoperation will be eliminated, so as to eliminate hidden dangers of accidents, the invention provides an interlocking device for the door of the cable room of the medium voltage switchgear , can effectively avoid misoperation in the maintenance process, this device can effectively guarantee the safety of people and equipment, and improve the safety and reliability of equipment.

In order to achieve the above object, the technical solution of the present invention is: a medium-voltage switchgear cable room cabinet door interlocking device, including the front door of the cable room, travel switch, program lock A, program lock key, interlock plate, locking electromagnet, Charge indicator, program lock B; the locking electromagnet, program lock A and travel switch are respectively installed on the mounting plate or a closed device, and the charged indicator is installed on the front door of the cable room to display whether the incoming line side is charged; The program lock B is installed on the back door or rear cover of the switch cabinet, and is used to unlock the back door or rear cover of the switch cabinet; one end of the program lock A lock cylinder connecting rod in the program lock A is fixedly connected with the interlocking plate , to form a linkage, the other end is connected to the travel switch lock cylinder connecting rod (10) in the travel switch (2), and is interlocked with the front-end power supply through the travel switch contact; the locking electromagnet lock cylinder in the locking electromagnet is connected The rod corresponds to the interlock plate hole on the interlock plate; the program lock B lock core connecting rod in the program lock B corresponds to the cabinet body fixing plate; the program lock A or program lock B can be inserted with a program lock key; The charged indicator is electrically connected to the locking electromagnet.

The locking electromagnet is installed in the closed device to reserve the extension position of the stroke switch lock cylinder connecting rod, the operating position of the program lock key and the locking electromagnet terminal.

An emergency unlocking device is provided at the top of the locking electromagnet lock cylinder connecting rod of the locking electromagnet. When the locking electromagnet lock is damaged, the emergency unlocking device will release the locking electromagnet lock cylinder connecting rod from the interlock on the interlocking plate. The plate hole is unlocked.

The electrified indicator detects whether the incoming line side is powered off. If the electrified indicator turns on the locking electromagnet, the locking electromagnet acts to make the locking electromagnet lock cylinder connecting rod break away from the interlocking plate hole on the interlocking plate to realize The interlocking of live indicator and locking electromagnet and interlocking plate.

When the front door of the cable room is opened, the travel switch is reset, and the incoming line side loses power, the locking electromagnet acts to make the locking electromagnet lock cylinder and connecting rod pull in, break away from the interlocking plate hole on the interlocking plate, and turn the program lock A on Take the program lock A key, take out the program lock A key, and turn the key on the program lock to unlock the interlock.

When the program lock key is inserted into the program lock B key hole installed on the back door of the medium-voltage switchgear, and after the key is turned, the program lock B lock cylinder connecting rod is separated from the cabinet fixing plate, the interlock is unlocked, and the medium-voltage The back door or cover plate of the switchgear can be opened or removed to complete the unlocking.

When the front door of the cable room is opened and the incoming line side is not powered off, the locking electromagnet does not act, and the locking electromagnet lock cylinder connecting rod is released and does not break away from the interlocking plate hole on the interlocking plate.

When the program lock key is not reset to the program lock A, the travel switch lock cylinder connecting rod is released, so that the front door of the cable room cannot be closed, the travel switch is activated, and the front power supply cannot supply power.

The present invention has the following beneficial effects:

(1) The present invention adopts programmed design, operates according to the process and is easy to operate;

(2) The present invention adopts the method of electrical interlock and mechanical interlock, which can effectively avoid misoperation, improve the safety and reliability of the equipment, and reduce the risk of accidents.

(3) The interlocking device of the present invention is simple in structure, easy to operate, safe and reliable, and the design of the interlocking device can prevent electrified misoperation and improve equipment and personal safety.

(4) The present invention adopts mechanized and electrified design and programmed process, which can effectively avoid possible misoperation during the operation process, eliminate hidden dangers of electrified misoperation, and achieve the purpose of reducing accident risk and improving reliability.

Description of drawings

Figure 1 is a front view of the structure before unlocking the door interlocking device of the cable room of the medium voltage switchgear;

Figure 2 is a side view of the structure of the cable room door interlock device of the medium voltage switchgear before unlocking;

Figure 3 is a front view of the structure after unlocking the door interlocking device of the cable room of the medium voltage switchgear;

Fig. 4 is a side view of the structure after unlocking the door interlocking device of the cable room of the medium voltage switchgear.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

The interlocking device for the door of the cable room of the medium-voltage switch cabinet of the present invention is mainly used to ensure the safety of people and equipment during the inspection and maintenance process. The present invention adopts the design of mechanical interlock and electric interlock, programmed operation mode, mutual interlocking, and must be operated according to the design process in the operation process, ensuring the reliability of interlocking and the safety of equipment.

The present invention adopts the form of mechanical program lock and electrical component interlocking, and through the interlocking of components, it is ensured that the medium voltage switch cabinet is powered off and the front-end power supply is powered off, and the medium voltage switch cabinet cable can be opened through the mechanical operation of the program lock. Remove the door of the cabinet or remove its cover, and carry out the inspection and maintenance of the components in the medium voltage switch cabinet under the condition of ensuring safety.

The cable room door involved in the cable room door interlocking device of the medium-voltage switchgear of the present invention is divided into a cable room front door and a cable room rear door or rear cover plate.

As shown in Figures 1 to 4, the interlocking device for the cable room door of the medium-voltage switchgear of the present invention includes the front door 1 of the cable room, the travel switch 2, the program lock A3, the program lock key 4, the interlock plate 5, and the locking electromagnetic Iron 6, charged display 7, program lock B8, cabinet fixing plate 9, travel switch lock cylinder connecting rod 10, program lock A lock cylinder connecting rod 11, interlocking plate hole 12, locking electromagnet lock cylinder connecting rod 13, program Lock B lock cylinder connecting rod 14, mounting plate or closed device 15, switchgear back door or rear cover 16, emergency unlocking device 17.

The locking electromagnet 6, the program lock A3 and the travel switch 2 are respectively installed on the mounting plate or the closed device 15, and the protruding position of the travel switch lock cylinder connecting rod 10 and the operation of the program lock key 4 must be reserved in the closed device 15. Position and latch solenoid 6 terminals. The live display 7 is installed on the front door 1 of the cable room, and can show whether the incoming line side is charged. The program lock B8 is installed on the back door of the switch cabinet or the rear cover 16 for unlocking the rear cover; one end of the program lock A lock cylinder connecting rod 11 is fixedly connected with the interlock plate 5 to form a linkage; the other end is connected to the travel switch 2 The travel switch lock cylinder connecting rod 10 in the travel switch is interlocked with the front-end power supply through the travel switch 2 contacts. The locking electromagnet lock cylinder connecting rod 13 in the locking electromagnet 6 corresponds to the interlocking plate hole 12 on the interlocking plate 5; the program lock B lock cylinder connecting rod 14 is housed in the program lock B8, and the program lock B lock cylinder connecting rod 14 Corresponding to the cabinet body fixing plate 9; the program lock key 4 can be inserted into the program lock A3 or the program lock B8; the electrified display 7 is electrically connected to the locking electromagnet 6.

When the front door 1 of the cable room is closed, press the travel switch lock cylinder connecting rod 10, the travel switch 2 auxiliary contact is locked, and the power supply of the upper stage works normally;

When the front door 1 of the cable room is opened, the travel switch lock cylinder connecting rod 10 is released, the travel switch 2 resets the auxiliary contact, and the power supply of the upper stage is cut off. On the contrary, if the front door 1 of the cable room is not closed, the upper level power supply will not be able to supply power.

1) Interlocking with the interlocking plate 5 through the electrified indicator 7 and the locking electromagnet 6: the electrified indicator 7 detects whether the incoming line side is de-energized. The action makes the locking electromagnet lock cylinder connecting rod 13 break away from the interlocking plate hole 12 on the interlocking plate 5;

2) By turning the key on the program lock, the interlock is unlocked: the front door 1 of the cable room is opened, the travel switch 2 is reset, the incoming line side is powered off, the locking electromagnet 6 operates, the locking electromagnet lock cylinder connecting rod 13 is attracted and disengaged Interlock plate hole 12 on the interlock plate 5, turn the program lock A key 4 on the program lock A3, and take out the program lock A key 4; otherwise, the incoming line side is charged, the locking electromagnet 6 does not act, and the program lock A key 4 Failed to remove.

3) Insert the program lock A key 4 taken out into the key hole of the program lock B8 installed on the back door 16 of the medium-voltage switchgear, turn the key 4, and the program lock B lock cylinder connecting rod 14 will be separated from the cabinet body fixing plate 9, and connected When the lock is released, the medium voltage switchgear back door or cover plate 16 can be opened or removed to complete the unlocking. As shown in Figure 4.

4) The key is not reset to the program lock A3, and the travel switch lock cylinder link 10 is released. At this time, the cable compartment door 1 cannot be closed, the travel switch 2 operates, and the front power supply cannot supply power.

5) The travel switch 2 is reset and interlocked with the locking electromagnet 6 to prevent power supply at the front end when the power supply is not closed: when the front door 1 of the cable room is opened, the incoming line side is not powered off, the locking electromagnet 6 does not operate, and the locking electromagnet locks the core The connecting rod 13 is released and disengages from the interlocking plate hole 12 on the interlocking plate 5 .

6) An emergency unlocking device 17 is provided on the top of the locking electromagnet lock core connecting rod 13 of the locking electromagnet 6. When the locking electromagnet lock is damaged, it can be unlocked by emergency unlocking under the condition of ensuring safety. That is, the locking electromagnet lock core connecting rod 13 is released from the interlocking plate hole 12 on the interlocking plate 5 through the emergency unlocking device 17 to unlock.

7) By turning the program lock A key 4 on the program lock A3, unlock the program lock B8 interlock and complete the unlocking;

If the program lock A key 4 is not reset into the program lock A key hole, the travel switch 2 lock cylinder connecting rod 10) cannot be reset, and the cabinet door cannot be closed, so that the front-end power supply cannot supply power, which avoids front-end failure when the cabinet door is opened for maintenance. Sudden power supply prevents hidden dangers of electrified misoperation and ensures personal safety.

In the device of the present invention, a set of door interlocking devices is installed on all the cable compartment doors of the incoming cabinets. When the door of the cable room is opened, the travel switch is triggered to disconnect the front-end power supply. After the electrified display detects that the incoming line side is powered off, the locking electromagnet acts, and the key is locked on A through the operating procedure, and the key is taken out to drive the interlocking plate to act. Conversely, if the front end is not powered off, the interlock plate cannot move, and the key cannot be rotated and taken out. At this time, if the cabinet door is not closed, the front-end power supply will not be able to supply power.

Insert the taken out key into another program lock B, turn the key, the program lock B lock cylinder connecting rod will be separated from the cabinet fixing plate, the interlock will be unlocked, and the medium voltage switch cabinet rear door or cover plate will be opened to complete the unlocking.

Therefore, through such an interlock, the danger of opening the rear cover of the cabinet body with electricity can be avoided to ensure equipment and personal safety.

The concrete operating process of device of the present invention:

1. Before overhaul or maintenance, the operation steps of unlocking:

1) First, cut off the front-end power supply. You can check whether the front-end is powered off through the live display 7 installed on the front door 1 of the cable room. Open the front door 1 of the cable room, reset the travel switch 2, and activate the auxiliary contact of the travel switch 2. The power supply has lost power or cannot be powered up again. At this time, the locking electromagnet 6 acts, and the locking electromagnet lock core connecting rod 13 is attracted and disengaged from the interlocking plate hole 12 on the interlocking plate 5; when the locking electromagnet lock 6 is damaged, the emergency release device 17 can be used Unlock to unlock it. As shown in Figure 3.

2) Next, turn the program lock key 4 on the program lock A3, and take out the program lock key 4;

3) Again, insert the program lock key 4 taken out into the program lock B8 keyhole installed on the rear door 16 of the medium voltage switch cabinet, turn the program lock key 4, and the program lock B lock cylinder connecting rod 14 will leave the cabinet body fixing plate 9, the interlock is released, and the medium voltage switchgear back door 16 can be opened to complete the unlocking. As shown in Figure 4.

4) Finally, open or remove the back door or cover plate 16 of the medium-voltage switchgear for inspection and maintenance.

2. After the inspection or maintenance is completed, return to the operation steps before unlocking:

1) First, open or remove the back door or cover plate 16 of the medium voltage switchgear cabinet or install and fix it on the cabinet body;

2) Next, turn the program lock key 4 in the program lock B8 key hole, the program lock B lock cylinder connecting rod 14 is inserted into the cabinet body fixing plate 9, and the program lock key 4 is taken out. as shown in picture 2.

3) Again, insert the program lock key 4 taken out into the program lock A3 key hole, turn the program lock key 4, and the program lock A lock cylinder connecting rod 11 and the interlock plate 5 will reset in linkage.

4) Finally, close the front door 1 of the cable room, press the travel switch lock cylinder connecting rod 10, the travel switch 2 auxiliary contact is locked, and the power supply of the upper level can supply power normally, that is, it returns to the state before unlocking. As shown in Figure 1.

Claims (8)

1. a kind of Medium Voltage Switchgear cable vault cabinet door interlock, including cable vault front door (1), travel switch (2), procedure lock A (3), program lock key (4), interlock plate (5), latching electromagnet (6), electrification display (7), procedure lock B (8), feature exists In: the latching electromagnet (6), procedure lock A (3) and travel switch (2) are separately mounted to mounting plate or closed device (15) On, the electrification display (7) is mounted on cable vault front door (1), for showing whether enter line side is charged；Described program locks B (8) it is mounted on rear door of switch cabinet or back shroud (16), for unlocking rear door of switch cabinet or back shroud (16)；Described program locks A (3) procedure lock A lock core connecting rod (11) one end in is fixed together with interlock plate (5), forms linkage, other end connection row Travel switch lock core connecting rod (10) in Cheng Kaiguan (2), and interlocked by travel switch (2) contact with front end power supply；Institute State the interlocking plate hole (12) on the latching electromagnet lock core connecting rod (13) corresponding interlock plate (5) in latching electromagnet (6)；The journey It is corresponding cabinet body fixed plate (9) that sequence locks the procedure lock B lock core connecting rod (14) in B (8)；Described program is locked in A (3) and procedure lock B (8) It can be inserted into program lock key (4)；The electrification display (7) is electrically connected latching electromagnet (6).

2. Medium Voltage Switchgear cable vault cabinet door interlock according to claim 1, it is characterised in that: the locking electromagnetism Iron (6), which is mounted in closed device (15), reserves travel switch lock core connecting rod (10) extended position, program lock key (4) operation Position and latching electromagnet (6) connecting terminal.

3. Medium Voltage Switchgear cable vault cabinet door interlock according to claim 1, it is characterised in that: the locking electromagnetism Emergency unlocking device (17) are arranged in latching electromagnet lock core connecting rod (13) top of iron (6), damage when latching electromagnet lock occurs When, latching electromagnet lock core connecting rod (13) are discharged the interlocking plate hole being detached from interlock plate (5) by the emergency unlocking device (17) (12) it is unlocked.

4. Medium Voltage Switchgear cable vault cabinet door interlock according to claim 1, it is characterised in that: the electrification display Device (7) detect enter line side whether power loss, if power loss, the electrification display (7) connects latching electromagnet (6), and the locking is electric Magnet (6) movement makes latching electromagnet lock core connecting rod (13) to be detached from the interlocking plate hole (12) on interlock plate (5), realizes electrification display The interlocking of device (7) and latching electromagnet (6) and interlock plate (5).

5. Medium Voltage Switchgear cable vault cabinet door interlock according to claim 1, it is characterised in that: when cable vault front door (1) it opens, travel switch (2) resets, and when enter line side power loss, latching electromagnet (6) movement connects latching electromagnet lock core Bar (13) is attracted, the interlocking plate hole (12) being detached from interlock plate (5), and the program lock key (4) in rotation procedure lock A (3) takes out Program lock key (4) realizes that the key on rotation procedure lock unlocks interlocking.

6. Medium Voltage Switchgear cable vault cabinet door interlock according to claim 1, it is characterised in that: when by program key In procedure lock B (8) keyhole that spoon (4) insertion is mounted on Medium Voltage Switchgear back door (16), after rotation program lock key (4), Described program lock B lock core connecting rod (14) is separated from cabinet body fixed plate (9), and interlocking is unlocked, Medium Voltage Switchgear back door or cover board (16) it can open or remove, complete unlock.

7. Medium Voltage Switchgear cable vault cabinet door interlock according to claim 1, it is characterised in that: when cable vault front door (1) it opens, when the non-power loss of enter line side, the latching electromagnet (6) is not operating, and the latching electromagnet lock core connecting rod (13) is released It puts, without departing from the interlocking plate hole (12) on interlock plate (5).

8. Medium Voltage Switchgear cable vault cabinet door interlock according to claim 1, it is characterised in that: when program lock key (4) be not reset to procedure lock A (3) it is interior when, the travel switch lock core connecting rod (10) release close cable vault front door (1) can not It closes, travel switch (2) movement, front end power supply can not power.