CN205724603U - A kind of high-voltage switch cabinet of transformer substation microcomputer misoperation prevention locking system - Google Patents

Abstract

A microcomputer anti-misoperation locking system for a high-voltage switchgear in a substation. The high-voltage switchgear in the substation includes a main transformer switchgear, a main transformer switch cabinet, a capacitor switch cabinet, a grounding transformer switch cabinet, a bus switch cabinet, and a bus switch knife cabinets, bus voltage transformer cabinets, and line switch cabinets; the high-voltage switch cabinet microcomputer anti-misoperation locking system includes: installing a Five-proof lock with anti-misoperation locking function; on the front cabinet door of the main transformer switch cabinet, main transformer switch cabinet, capacitor switch cabinet, grounding transformer switch cabinet, bus branch switch cabinet, bus switch switch cabinet, bus voltage transformer cabinet, The rear cabinet door and the swing hole of the trolley are equipped with five anti-locks with anti-misoperation locking function; the utility model improves the anti-misoperation locking function of the high-voltage switchgear, greatly reduces the probability of misoperation accidents and effectively guarantees operation and maintenance personnel Work safety and power grid equipment are safe and reliable.

Description

A microcomputer anti-misoperation locking system for high-voltage switchgear in substations

technical field

The utility model relates to a microcomputer anti-misoperation locking system for a high-voltage switch cabinet in a substation, which belongs to the field of electric equipment tools.

Background technique

In modern society, electricity plays an extremely important role in the national economy, national security, and people's daily life. As an important electrical equipment in the power system, high-voltage switchgear is generally used in 10-35kV substation equipment. Focusing on the transmission and protection control of electric energy, it provides users with high-quality electric energy. With the rapid development of substation automation technology and the increasing requirements for power supply reliability, the role of switchgear in substations is also more prominent. Therefore, how to ensure the safe and reliable operation of the high-voltage switchgear in the substation has become an important task in the operation and maintenance of power system substations.

The installation of anti-misoperation locking devices in high-voltage switchgear is a fundamental measure for power production to ensure the safety of people, power grids, and equipment. According to the "State Grid Corporation of Electricity Safety Work Regulations", the high-voltage switchgear should be equipped with a complete anti-misoperation locking device, and have a complete and reliable anti-misoperation locking function. If it does not have the anti-misoperation locking function, a mechanical lock should be installed. However, there are still some switchgears that are not equipped with a complete anti-misoperation locking device, relying only on the anti-misoperation locking function that comes with the switchgear, and even some switchgear cabinets are only fixed with screws to prevent staff from misuse. enter. Looking at the misoperation and personal injury accidents that occurred in electric power companies this year, the proportion of accidents caused by incomplete, unreliable or unauthorized unlocking of switchgear anti-misoperation locking devices accounted for as high as 60%.

In order to effectively prevent personal and major equipment accidents caused by misoperation of high-voltage switchgear, the State Grid Corporation has formulated a series of anti-misoperation management regulations and anti-misoperation device management methods, but in actual production and actual work, misoperation accidents of switchgear are still Happens frequently.

Contents of the invention

The purpose of the utility model is to overcome the deficiencies of the existing high-voltage switchgear anti-misoperation locking function, to provide a simple structure, easy to use and operate, which can effectively reduce the probability of misoperation accidents caused by the incomplete anti-misoperation locking function of the switchgear itself. A microcomputer anti-misoperation locking system and method for a high-voltage switchgear in a substation.

The purpose of this utility model is accomplished through the following technical scheme, a microcomputer anti-misoperation locking system for a high-voltage switchgear in a substation. Grounding substation switchgear, bus-separation switchgear, bus-separation switchgear, bus voltage transformer cabinet, line switchgear; the high-voltage switchgear microcomputer anti-misoperation locking system includes: the front cabinet door and the rear cabinet of the line switchgear The door, the trolley rocker hole, and the grounding knife are respectively equipped with five-proof locks with the function of preventing false locking; in the main transformer switchgear, main transformer switchgear, capacitor switchgear, grounding Five anti-locks with anti-misoperation locking function are installed on the front cabinet door, rear cabinet door, and trolley swing hole of the switch cabinet and bus voltage transformer cabinet.

As a preference: the high-voltage switchgear includes 10kV switchgear, 20kV switchgear, and 35kV switchgear: the five-proof lock of the high-voltage switchgear can be realized: (1) to prevent mis-distribution and mis-closure of the switch, (2) To prevent pulling and closing the isolation switch with load, 3) to prevent the live connection (closing) of the ground wire (ground switch), (4) to prevent the ground wire (ground switch) from closing the switch (isolation switch) and (5) to prevent The "five prevention" function of stray into the electrified interval.

A microcomputer anti-misoperation locking method using the microcomputer anti-misoperation locking system of a high-voltage switchgear in a substation. The microcomputer anti-misoperation locking method includes:

First of all, the operator issues an invoice according to the dispatching order, and changes the standby line of the high-voltage switchgear from operation to an operation ticket for line maintenance, which specifically includes the following procedures:

1) Pull the switch of the standby line;

2) Check the disconnection position determined by the line switch to be used;

3) Shake the standby circuit switch trolley from the working position to the test position to fix and check;

4) Take off the bus differential outlet pressure plate LPxx of the line switch to be used, and check;

5) Check the standby line switch to determine the cold standby;

6) Switch the bus differential protection switch QB of the high-voltage switchgear to the bus differential back position;

7) Check that the BP-2B device interface on the bus differential protection screen of the high-voltage switchgear displays differential exit and differential lock exit;

8) Use 4 shorting screws to short-circuit and ground the 3SD rheological side of the substation 648 line switch bus difference CT terminal;

9) Remove the bus differential CT terminal 3SD of the 648 line switch in the substation and connect it to the bus differential circuit with 4 connecting screws;

10) Check that the bus differential protection of the high-voltage switchgear has no action and abnormal signals;

11) Switch the bus differential protection switch QB of the high-voltage switchgear to the bus differential switch position;

12) Check that the BP-2B device interface on the bus differential protection screen of the high-voltage switchgear displays differential input and differential locking input;

13) Remove the secondary plug-in of the standby circuit switch trolley;

14) Pull the circuit switch trolley to be used from the test position to the outside of the cabinet and fix it, and check;

15) At the switch cabinet of the line to be used, push the line electric inspection trolley from the outside of the cabinet to the test position, then shake it to the working position and fix it, and check;

16) Conduct a three-phase electric test at the static contact on the line side of the line electric test trolley. After confirming that there is no voltage, shake the line electric test trolley from the working position to the test position, pull it out of the cabinet and fix it, and check;

17) Close the grounding knife of the standby line and check;

18) Disconnect the air switch 3DK2 of the standby line switch to control the power supply;

After the prepared operation ticket has been verified and signed by the positive value and the value chief, and the dispatching order is issued, the switching operation of the standby line of the high-voltage switchgear can be changed from operation to switch and line maintenance.

As a preference: before the switchgear switching operation is executed, the operator will issue a graphic invoice in the background five-defense system according to the operation steps to verify the rationality of the operation steps;

When performing on-site operations, after the graphical invoicing is completed, the computer key is transferred, and the operator executes the operation item by item according to the content of the operation ticket. When the operation content that violates the anti-misoperation locking logic is executed, the computer key realizes forced locking, and at the same time sends out an alarm and prompt information. Guide the operator to perform the operation correctly, so as to achieve the purpose of preventing misoperation;

During remote operation, the operator sends a permission signal to the monitoring system through the host to unlock the remote control lock of the corresponding node. After the operation is completed, the host updates the device status to the current actual status.

As a preference: According to the requirements of the high-voltage switchgear anti-misoperation specification, the standby line of the high-voltage switchgear is changed from operation to switch and line maintenance. The operation ticket needs to pass the five-proof verification for an operation, which specifically includes the following 4 steps:

1) Pull the switch of the standby line;

2) Shake the waiting line switch trolley from the working position to the test position, and check;

3) Pull the circuit switch trolley to be used from the test position to the outside of the cabinet to fix it, and check it;

4) Close the grounding knife of the standby line and check;

Step 1) In the operation of step 1, after the verification of the five-proof system, it can help the operator to check the name of the equipment, and avoid the occurrence of vicious misoperation accidents such as the operator mistakenly distinguishing other interval switches in the background;

Step 2) In the operation of step 2, by installing five anti-locks on the switch cabinet trolley shaking hole of the standby line of the high-voltage switch cabinet, it can effectively prevent the staff from entering the charged interval by mistake, and shake the switch trolley from the working position to the Occurrence of misoperation accidents at the test position;

Step 3) In the operation of step 3, by installing five anti-locks on the front door of the switch cabinet of the standby line of the high-voltage switch cabinet, it can effectively prevent the staff from working under high pressure and inattention. The occurrence of such accidents when the front door of the switchgear is opened when the switchgear is in the position;

Step 4) In the operation of step 4, by installing five anti-locks on the switch cabinet line grounding knife of the standby line of the high-voltage switch cabinet, it can effectively prevent the staff from closing the grounding knife switch when it is charged or the switch trolley is not in the test position. Occurrence of vicious misuse accidents.

Compared with the prior art, the utility model improves the anti-misoperation locking function of the high-voltage switchgear, and has the advantages of greatly reducing the probability of misoperation accidents, effectively ensuring operation, working safety of maintenance personnel, and safety and reliability of power grid equipment.

Description of drawings

Fig. 1 is a schematic diagram of a 35kV line switch cabinet of the present utility model, which is equipped with five anti-misoperation locking devices at the front cabinet door, rear upper cabinet door, rear lower cabinet door, trolley rocker hole, and line grounding knife.

Fig. 2 is a kind of 35kV switchgear except line switchgear of the utility model in the front cabinet door, rear upper cabinet door, rear lower cabinet door, trolley shake hole and installs the schematic diagram of anti-misoperation locking device of five anti-locks.

Fig. 3 is another 20kV line switch cabinet of the present utility model, which is equipped with five anti-locks at the front middle cabinet door, front lower cabinet door, rear upper cabinet door, rear lower cabinet door, trolley shake hole, and line grounding knife. Schematic diagram of the misuse locking device.

Fig. 4 is another 20kV switchgear of the utility model except the line switchgear, which is equipped with five anti-mistakes on the front middle cabinet door, front lower cabinet door, rear upper cabinet door, rear lower cabinet door, and trolley shake hole. Schematic diagram of the operating locking device.

Fig. 5 is a schematic diagram of a 10kV line switch cabinet of the present invention, which is equipped with five anti-misoperation locking devices at the front cabinet door, rear upper cabinet door, rear lower cabinet door, trolley shaker hole, and line grounding knife.

Fig. 6 is a schematic diagram of an anti-misoperation locking device with five anti-misoperation locks installed on the front cabinet door, the rear upper cabinet door, the rear lower cabinet door, and the trolley shaking hole of a 10kV switch cabinet except the line switch cabinet of the present utility model.

Figure 7 is a schematic diagram of a 35kV standby 750 switchgear with five anti-locks installed.

detailed description

The utility model relates to a microcomputer anti-misoperation locking system for a high-voltage switchgear in a substation. The high-voltage switchgear in the substation includes a main transformer switchgear, a main transformer switchboard, a capacitor switchgear, a grounding transformer switchgear, and a busbar switch cabinet, bus switch cabinet, bus voltage transformer cabinet, line switch cabinet; the high-voltage switch cabinet microcomputer anti-misoperation locking system includes: front cabinet door, rear cabinet door, trolley shaker hole, grounding gate Five anti-locks with anti-misoperation locking function are installed at the knife; in the main transformer switch cabinet, main transformer switch cabinet, capacitor switch cabinet, grounding substation switch cabinet, bus branch switch cabinet, bus branch switch cabinet, bus voltage The front cabinet door, rear cabinet door, and trolley shake hole of the cabinet are respectively equipped with five anti-locks with the function of preventing false locking.

The high-voltage switchgear includes 10kV switchgear, 20kV switchgear, and 35kV switchgear: the five-proof lock of the high-voltage switchgear can be realized: (1) prevent mis-distribution and mis-close switch, (2) prevent load Pulling and closing the isolation switch, 3) preventing live connection (closing) the grounding wire (grounding switch), (4) preventing the grounding wire (grounding switch) from closing the switch (isolation switch) and (5) preventing accidental entry of charged Interval "five defenses" function.

The utility model will be described in detail below in conjunction with the accompanying drawings: as shown in Figure 1, a kind of substation high-voltage switchgear microcomputer anti-misoperation locking method described in the utility model, it includes the front cabinet door of the 35kV line switchgear, trolley Shake hole, line grounding knife, rear upper cabinet door, and rear lower cabinet door are equipped with five-proof locks with anti-misoperation functions; the five-proof locks include the following anti-misoperation functions: (2) prevent the load from pulling and closing the isolation switch; (3) prevent the live switch from closing the ground switch; (4) prevent the ground switch from closing the isolation switch; (5) prevent accidental entry into the charged interval.

As shown in Figure 2, a microcomputer anti-misoperation locking method for substation high-voltage switchgear described in the utility model includes 35kV main transformer switchgear, main transformer switchgear, capacitor switchgear, grounding transformer switchgear, busbar The front cabinet door, the trolley swing hole, the rear upper cabinet door, and the rear lower cabinet door of the switch cabinet, bus switch cabinet, and bus voltage transformer cabinet are equipped with five-proof locks with anti-misoperation functions; the five-proof locks include The following anti-misoperation functions: (1) Prevent mis-opening and closing of switches by mistake; (2) Prevent pulling and closing of the isolation switch with load; 3) Prevent charged (closed) grounding wire (grounding switch); (4) Prevent With grounding wire (grounding knife switch) closing switch (isolation knife switch); (5) to prevent accidental entry into the electrified interval.

As shown in Fig. 3, a kind of anti-misoperation locking method of substation high-voltage switchgear microcomputer according to the utility model, it includes the front middle cabinet door, front lower cabinet door, trolley shake hole, line grounding switch knife in the 20kV line switch cabinet , The rear upper cabinet door and the rear lower cabinet door are equipped with five-proof locks with anti-misoperation locking functions; the anti-misoperation locking functions corresponding to the five anti-locks are: (1) to prevent mis-opening and mis-closing switches; (2) Prevent the load from pulling and closing the isolation switch; (3) prevent the live switch from closing the ground switch; (4) prevent the ground switch from closing the isolation switch; (5) prevent accidental entry into the charged interval.

As shown in Figure 4, a microcomputer anti-misoperation locking method for high-voltage switchgear in a substation described in the present invention includes 20kV main transformer switchgear, main transformer switchgear, capacitor switchgear, grounding transformer switchgear, bus divider The front middle cabinet door, the front lower cabinet door, the trolley swing hole, the rear upper cabinet door, and the rear lower cabinet door of the switch cabinet, bus switch switch cabinet, and bus voltage transformer cabinet are equipped with five-proof locks with anti-misoperation functions; The five anti-locks described above include the following anti-misoperation functions: (1) Prevent mis-opening and closing of the switch by mistake; (2) Prevent pulling and closing the isolation switch with load; ); (4) Prevent the switch (isolation switch) with grounding wire (grounding knife switch); (5) Prevent strayed into the electrified interval.

As shown in Figure 5, a kind of substation high-voltage switchgear microcomputer anti-misoperation locking method described in the utility model includes the front cabinet door, trolley shaker hole, line grounding switch knife, rear upper cabinet door, The rear lower cabinet door is equipped with a five-proof lock with anti-misoperation function; the five-proof lock includes the following anti-misoperation functions: (1) prevent wrong opening and closing of the switch; (2) prevent load pulling and closing isolation (3) Prevent electrified and grounded knife switch; (4) Prevent grounded knife switch from closing and isolating knife switch; (5) Prevent accidental entry into charged interval.

As shown in Figure 6, a microcomputer anti-misoperation locking method for high-voltage switchgear in a substation according to the utility model, which includes 10kV main transformer switchgear, main transformer switchgear, capacitor switchgear, grounding transformer switchgear, bus divider The front cabinet door, the trolley swing hole, the rear upper cabinet door, and the rear lower cabinet door of the switch cabinet, bus switch cabinet, and bus voltage transformer cabinet are equipped with five-proof locks with anti-misoperation functions; the five-proof locks include The following anti-misoperation functions: (1) Prevent mis-opening and closing of switches by mistake; (2) Prevent pulling and closing of the isolation switch with load; 3) Prevent charged (closed) grounding wire (grounding switch); (4) Prevent With grounding wire (grounding knife switch) closing switch (isolation knife switch); (5) to prevent accidental entry into the electrified interval.

Example:

Due to the actual needs of production, according to the dispatching requirements, a 35kV standby 750 line in a substation is changed from operation to switch and line maintenance. Below will adopt the utility model method under the situation that five anti-locks are installed additionally in the switchgear, change the 35kV standby 750 line from operation into switch and line maintenance.

Figure 7 is a schematic diagram of a 35kV standby 750 switchgear equipped with five anti-locks, which includes the front cabinet door of the 35kV standby 750 switchgear, the swing hole of the trolley, the standby 750 line grounding knife, the rear upper cabinet door, and the rear lower The cabinet door is equipped with a five-proof lock with anti-misoperation function.

First of all, the operating personnel issue tickets according to the dispatching order, and the operation ticket for the 35kV standby 750 line to be changed from operation to line maintenance is as follows:

1) Pull the standby 750 line switch;

2) Check that the standby 750 line switch is in the off position;

3) Shake the standby 750 line switch trolley from the working position to the test position, and check;

4) Remove the pressure plate LPxx of the bus differential outlet of the 750-line switch to be used, and check;

5) Check that the standby 750 line switch is in cold standby;

6) Switch the 35kV bus differential protection switch QB to the bus differential back position;

7) Check that the BP-2B device interface on the 35kV bus differential protection screen displays differential exit and differential lock exit;

8) Use 4 shorting screws to short-circuit and ground the rheological side of the CT terminal 3SD of the Chengnan 648 line switch bus difference;

9) Remove the bus differential CT terminal 3SD of Chengnan Line 648 and connect it to the bus differential circuit with 4 connecting screws;

10) Check that the 35kV bus differential protection has no action and abnormal signals;

11) Switch the 35kV bus differential protection switch QB to the bus differential switch position;

12) Check that the BP-2B device interface on the 35kV bus differential protection screen displays differential input and differential locking input;

13) Remove the secondary plug-in of the standby 750 line switch trolley;

14) Pull the standby 750 line switch trolley from the test position to the outside of the cabinet and fix it, and check;

15) At the 750 line switch cabinet to be used, push the 35kV line electric inspection trolley from the cabinet to the test position, then shake it to the working position and fix it, and check;

16) Conduct a three-phase electric test at the static contact on the line side of the 35kV line electric test trolley. After checking that there is no voltage, shake the 35kV line electric test trolley from the working position to the test position, pull it out of the cabinet and fix it, and check;

17) Close the standby 750 line grounding switch and check;

18) Disconnect the standby 750-line switch to control the power supply air switch 3DK2;

After the prepared operation ticket has been verified and signed by the positive value and the value chief, and the dispatching order is issued, the switching operation of the 35kV standby 750 line can be changed from operation to switch and line maintenance.

Before the switchgear switching operation is executed, the operator will issue a graphical invoice in the background five-proof system according to the operation steps to verify the rationality of the operation steps. When performing on-site operations, after the graphical invoicing is completed, the computer key is transferred, and the operator executes the operation item by item according to the content of the operation ticket. When the operation content that violates the anti-misoperation locking logic is executed, the computer key realizes forced locking, and at the same time sends out an alarm and prompt information. Guide the operator to perform the operation correctly, so as to achieve the purpose of preventing misoperation. During remote operation, the operator sends a permission signal to the monitoring system through the host to unlock the remote control lock of the corresponding node. After the operation is completed, the host updates the device status to the current actual status.

According to the requirements of the high-voltage switchgear anti-misoperation specification, the 35kV standby 750 line is changed from operation to switch and line maintenance. The operation ticket that needs to pass the five-proof verification has the following 4 steps:

1) Pull the standby 750 line switch

2) Shake the standby 750 line switch trolley from the working position to the test position and fix it, and check

3) Pull the 750-wire switch trolley to be used from the test position to the outside of the cabinet and fix it, and check

4) Close the standby 750 line grounding knife, and check

Step 1) In the operation of step 1, after the verification of the five-proof system, it can help the operator to check the name of the equipment, and avoid the occurrence of vicious misoperation accidents such as the operator mistakenly distinguishing other interval switches in the background;

Step 2) Operation, by installing five anti-locks on the shaking hole of the 35kV standby 750 switchgear trolley, it can effectively prevent the staff from entering the electrified interval by mistake, and shake the switch trolley from the working position to the test position when the switch is closed. the occurrence of an accident;

Step 3) By installing a five-proof lock on the front door of the 35kV standby 750 switchgear, it can effectively prevent the staff from opening due to high work pressure and inattention when the switch is charged or the switch trolley is not in the test position. The occurrence of such accidents on the front cabinet door of the switch cabinet;

Step 4) By installing five anti-locks on the 35kV stand-by 750 switchgear circuit grounding switch, it can effectively avoid vicious misoperation accidents such as the staff being charged to close the grounding switch or the switch trolley closing the grounding switch when the switch trolley is not in the test position. happened.

In the above switching operation, by adding five-proof locks with anti-misoperation locking function to the front cabinet door, trolley shaker hole, and line grounding knife of the 35kV standby 750 switchgear, the probability of misoperation accidents can be greatly reduced, thereby ensuring Safety of operating personnel and grid equipment.

At the same time, by installing five anti-locks on the rear upper and lower rear doors of the 35kV standby 750 switchgear, it can effectively prevent maintenance personnel from opening the rear door of the switchgear without authorization when the 35kV standby 750 line is charged. The occurrence of electric shock accidents.

Other embodiments of the utility model can use 10kV switchgear and 20kV switchgear to replace 35kV standby 750 switchgear.

Claims (2)

1. a high-voltage switch cabinet of transformer substation microcomputer misoperation prevention locking system, described high-voltage switch cabinet of transformer substation includes that main transformer switch cabinet, main transformer plug-in strip cabinet, capacitor switch cabinet, ground connection become switch cubicle, mother stock switch cubicle, mother stock plug-in strip cabinet, bus voltage transformer cabinet, line switching cabinet；It is characterized in that described high-tension switch cabinet microcomputer misoperation prevention locking system includes: shake to install additional respectively at hole, earthing switch blade at the front cabinet door of line switching cabinet, rear cabinet door, dolly there is the five anti-lock of anti mis-closedown function；Become switch cubicle main transformer switch cabinet, main transformer plug-in strip cabinet, capacitor switch cabinet, ground connection, mother stock switch cubicle, mother stock plug-in strip cabinet, the front cabinet door of bus voltage transformer cabinet, rear cabinet door, dolly shake to install additional respectively at hole has the five anti-lock of anti mis-closedown function.

High-voltage switch cabinet of transformer substation microcomputer misoperation prevention locking system the most according to claim 1, it is characterised in that described high-tension switch cabinet includes 10kV switch cubicle, 20kV switch cubicle, 35kV switch cubicle.