CN104682363A - Movable type line protection trolley and protection control method thereof - Google Patents

Abstract

The invention discloses a mobile line protection trolley and a protection control method thereof, belonging to the technical field of power supply line detection. The mobile line protection trolley includes a mobile trolley installed on the protection chamber on the top of the trolley, wherein the bottom of the trolley is equipped with wheels, and the trolley is connected to the supporting plate at the bottom of the protection chamber through a lifting rod. The small room includes a box body, and a line protection device installed on the box body, several circuit breakers, a control switch, a transfer switch and a connecting piece group. The mobile line protection trolley and its protection control method described in the present invention can quickly replace the microcomputer protection device of the running line when the microcomputer protection device of the running line needs to be overhauled, and continue to implement detection and protection on the line to realize the maintenance of the protection device , The line is not powered off, reducing the economic loss caused by the power outage and improving the reliability of power supply.

Description

A mobile line protection trolley and its protection control method

technical field

The invention relates to a mobile line protection trolley and a protection control method thereof, belonging to the technical field of power supply line detection.

Background technique

With the rapid development of the national economy, on the one hand, users have higher and higher requirements for power quality and power supply reliability, and hope that the power grid can supply power for many years; Load operation also needs to arrange power outage maintenance to replace aging components to ensure the safe and stable operation of the power grid.

The basic system of the microcomputer protection device consists of four parts: data acquisition unit, data processing unit, digital input/output system and communication interface. The functions of control, backup power automatic switching and communication monitoring provide a complete solution for the protection and control of substations, power plants, high and low voltage power distribution and plant power systems, which can effectively protect high and low voltage power grids and plant power systems safe and stable operation. The main protections configured by the microcomputer line protection device are: three-stage over-current protection, over-current acceleration, overload, three-phase one-time reclosing, low-cycle load shedding, zero-sequence over-current protection, PT disconnection, control disconnection, low-voltage protection, overvoltage protection, etc.

The line protection of 220kV and above is generally configured in a near-backup dual configuration. When the protection device is overhauled, only the equipment to be repaired is changed to the inactive state, and the corresponding primary equipment does not need to be out of service, realizing the non-stop maintenance of protection. In the microcomputer protection of 10kV voltage line, due to the reason of construction cost, the remote backup single set configuration mode is generally adopted, and the maintenance of the protection device can only be carried out after the primary equipment is out of service, so the power supply line and The power grid is disconnected, and the 10kV line directly faces the user, which is the key link of power supply, but its structure is relatively weak. Most of the power outages suffered by users are caused by the power outage of this level of line. Among them, the power failure maintenance of the protection device also accounts for a large proportion. According to statistics, in 2013, the Linan Bureau carried out a total of 261 outage inspections for 10kV lines, and there were as many as 86 outage inspections for 10kV lines related to protection equipment, accounting for 32.95% of the total number of outage inspections in the year, involving about 1,500 users. The maintenance took an average of 3 hours, resulting in a total loss of about 4,500 households, which greatly affected the reliability index of power supply, and the extension of power outage time would inevitably cause dissatisfaction and complaints from electricity customers. Under the long-term working condition, the physical strength and spirit of the maintenance personnel are under double test, and there are certain hidden safety hazards, which increase the probability of safety accidents.

In view of this, the inventor conducted research on this, and specially developed a mobile line protection trolley and its protection control method, and this case arose from it.

Contents of the invention

The purpose of the present invention is to provide a mobile line protection trolley and its protection control method, which is used to replace the microcomputer protection device of the running line when the microcomputer protection device of the running line needs to be overhauled, to continue to detect and protect the power supply line, and then When the microcomputer protection device is overhauled, the line will not be powered off.

In order to achieve the above object, the solution of the present invention is:

A mobile line protection trolley, comprising a mobile trolley, installed on the protection cell on the top of the mobile trolley, wherein the bottom of the mobile trolley is equipped with wheels, and the mobile trolley is connected to the supporting plate at the bottom of the protection compartment through a lifting rod. The small room includes a box body, and a line protection device installed on the box body, several circuit breakers, a control switch, a transfer switch and a connecting piece group.

Preferably, the connecting sheet group is used to control the function of the line protection device, specifically including:

The first connecting piece is the tripping outlet control pressure plate of the line protection device, which is manually switched on and off. The switch is opened; when exiting, after the protection trip contact is connected, the line protection device cannot issue an opening command to the power supply line switch through the first connecting piece;

The second connecting piece is the reclosing outlet control pressure plate of the line protection device, which is switched on and off manually. The switch closes; when exiting, the reclosing contact is connected, and the line protection device cannot issue a closing command to the power supply line switch through the second connecting piece;

The third connecting piece is the reclosing locking plate of the line protection device, which is switched on and off manually. When it is put in, the reclosing function of the line protection device is blocked, and the reclosing contact will not move; when it is withdrawn, the reclosing function of the line protection device is disabled. Open, the reclosing contact will act when the operating conditions are met;

The fourth connecting piece is the low-cycle load-shedding control plate of the line protection device, which is switched on and off manually, and the low-cycle load-shedding function of the protection device is opened after being put in; otherwise, it is locked;

The fifth connecting piece is the pressure plate for the maintenance state of the line protection device. After putting it into operation, the protection device will be placed in the maintenance state, and the remote control function and the upload function of the on-site debugging signal will be closed; otherwise, the above functions will be opened.

Preferably, each connecting piece of the connecting piece group adopts a connecting piece with a model number of YY1-D1-A.

Preferably, the line protection device adopts a line protection device modeled as RCS-9611C.

Preferably, the circuit breaker includes four miniature circuit breakers for disconnecting and connecting the DC/AC voltage circuit respectively, which are the first circuit breaker 1DK, the second circuit breaker 2DK, the third circuit breaker 3DK and the fourth circuit breaker Device 1ZKK.

As a preference, the transfer switch adopts a model LW21-16/9.5939.3 transfer switch, which is used to switch the local and remote control rights of the power supply line switch.

Preferably, the wheels include two universal wheels installed at the front end of the mobile trolley, and two directional wheels installed at the rear end of the mobile trolley.

Preferably, the mobile trolley is welded by stainless steel.

The protection control method of the above-mentioned mobile line protection trolley comprises the following steps:

1) First push the mobile line protection trolley to the side of the microcomputer protection device that needs to be replaced through the bottom wheels, and adjust the protection chamber to the set height through the lifting rod, and then connect the working power supply to the line protection device through the first circuit breaker, At the same time, through the second circuit breaker, each component in the protection chamber is connected to the driving operation power supply, and the current signal and voltage signal of the power supply line are respectively connected to the line protection device of the protection chamber through the terminal block;

2) After the installation of the mobile line protection trolley is completed, cut off the replaced microcomputer protection device;

3) Turn the transfer switch to "on-site", transfer switch 1-2, control switch 1-2, send a closing command to the power supply line switch through the line protection device, the power supply line switch is closed, the power supply line and the power grid China Unicom; control the 3-4 connection of the switch, send an opening command to the power supply line switch through the line protection device, the power supply line switch is opened, and the power supply line is disconnected from the grid;

4) Switch the transfer switch to "remote", switch 3-4, if the remote dispatching center sends a closing command to the line protection device through the network, after the remote closing contact is connected, the line protection device sends a closing command to the power supply line switch command, the power supply line switch is closed, and the power supply line is connected to the power grid; if the remote dispatching center sends an opening command to the line protection device through the network, after the remote jumper is connected, the line protection device sends an opening command to the power supply line switch, and the power supply line The switch is opened, and the power supply line is disconnected from the grid;

5) After the line protection device judges that a fault occurs in the line, the protection trip contact is connected, and the line protection device sends an opening command to the power supply line switch through the first connecting piece, and the power supply line switch is opened;

6) After the reclosing action, the reclosing contact of the reclosing switch is connected, the line protection device sends a closing command to the power supply line switch through the second connecting piece, and the power supply line switch closes.

The mobile line protection trolley and its protection control method described in the present invention can quickly replace the microcomputer protection device of the running line when the microcomputer protection device of the running line needs to be overhauled, and continue to implement detection and protection on the line to realize the maintenance of the protection device , The line is not powered off, reducing the economic loss caused by the power outage and improving the reliability of power supply.

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

Description of drawings

Fig. 1 is the front view of the mobile line protection trolley of the present embodiment;

Fig. 2 is a schematic diagram of the protection control method of the mobile line protection trolley in this embodiment.

Detailed ways

As shown in Figure 1-2, a mobile line protection trolley includes a mobile trolley 1 and a protection chamber 2 installed on the top of the mobile trolley 1, wherein the bottom of the mobile trolley 1 is equipped with wheels 11, and the wheels 11 It includes 2 universal wheels installed at the front end of the mobile trolley 1, and 2 directional wheels installed at the rear end of the mobile trolley 1; the mobile trolley 1 is connected to the supporting plate 21 at the bottom of the protection chamber 2 through the lifting rod 3, and the protection The small room 2 includes a box body 22, and a line protection device 1n installed on the box body 22, several circuit breakers, a circuit breaker control switch 1KK, and a transfer switch 1QK, which are respectively used for disconnecting and connecting DC/ The first circuit breaker 1DK, the second circuit breaker 2DK, the third circuit breaker 3DK and the fourth circuit breaker 1ZKK of the AC voltage circuit; and the connecting piece group 1LP. The connecting piece group 1LP1-5 is used to control the function of the line protection device 1n, specifically including:

The first connecting piece 1LP1 is a pressure plate for controlling the tripping exit of the line protection device 1n, and the switching operation is performed manually. When inputting, after the protection tripping contact BTJ is connected, the line protection device 1n can send an opening command to the power supply line switch through the first connecting piece 1LP1, and the power supply line switch is opened; when withdrawing, after the protection tripping contact BTJ is connected, the line protection The device 1n cannot issue an opening command to the power supply line switch through the first connecting piece 1LP1;

The second connecting piece 1LP2 is the control plate of the reclosing outlet of the line protection device 1n, and the switching operation is performed manually. When inputting, the reclosing BHJ contact is connected, and the line protection device 1n can issue a closing command to the power supply line switch through the second connecting piece 1LP2, and the power supply line switch is closed; when exiting, the reclosing BHJ contact is connected, and the line protection device 1n cannot Send a closing command to the power supply line switch through the second connecting piece 1LP2;

The third connecting piece 1LP3 is the reclosing and locking pressure plate of the line protection device 1n, which is switched on and off manually. When inputting, the reclosing function of the line protection device is blocked, and the reclosing BHJ contact will not act; when withdrawn, the reclosing function of the line protection device is released, and the reclosing BHJ contact will act when the operating conditions are met;

The fourth connecting piece 1LP4 is the low-period load-shedding control plate of the line protection device 1n, and the switching operation is performed manually. Open the low-cycle load shedding function of the line protection device 1n after putting it into use; otherwise, it will be blocked;

The fifth connecting piece 1LP5 is the pressure plate for the line protection device to be in the maintenance state. After putting it into operation, the line protection device 1n is placed in the maintenance state, and the remote control function and the upload function of the on-site debugging signal are closed; otherwise, the above functions are opened.

In this embodiment, the line protection device 1n adopts a line protection device modeled as RCS-9611C, which has the characteristics of powerful functions, a direction discrimination element in overcurrent protection, and strong substitution. The transfer switch 1QK adopts the transfer switch model LW21-16/9.5939.3, which is used to switch the local and remote control rights of the power supply circuit switch. Each connecting piece in the connecting piece group 1LP is a connecting piece with a model number of YY1-D1-A, which is used to control the function of the line protection device. The first circuit breaker 1DK and the second circuit breaker 2DK adopt the miniature circuit breaker model GM32H-2P2R/B6, and the third circuit breaker 3DK adopts the miniature circuit breaker model GMT32-B1/3200 1A. The four-circuit breaker 1ZKK adopts a miniature circuit breaker of the model GMT32-B1/3220 1A; the circuit breaker control switch 1KK adopts the control switch of the model LW21-16Z/4.0653.3S, and the transfer switch 1QK adopts the model of LW21-16 /9.5939.3 transfer switch. The various components in the above-mentioned protection chamber 2 are electrically connected by standard multi-strand flexible wires.

The mobile trolley 1 is welded by stainless steel.

The protection control method of the above-mentioned mobile line protection trolley comprises the following steps:

1) First push the mobile line protection trolley to the side of the microcomputer protection device to be replaced through the bottom wheel 11, and adjust the height of the protection chamber 2 through the lifting rod 21 to make it almost as high as the replaced microcomputer protection device, ensuring that the mobile The line protection trolley can be smoothly connected with the power supply line and the replaced microcomputer protection device. The line protection device 1n is connected to the working power through the first circuit breaker 1DK, and at the same time, the components in the protection chamber 2 are connected through the second circuit breaker 2DK. Input the driving operation power supply, the current signal and voltage signal of the power supply line are respectively connected to the line protection device 1n of the protection chamber 2 through the terminal block;

2) After the installation of the mobile line protection trolley is completed, cut off the replaced microcomputer protection device;

3) Switch the transfer switch 1QK to "on-site", the transfer switch 1-2 is on, the control switch 1KK is on 1-2, and the line protection device 1n sends a closing command to the power supply line switch, the power supply line switch is closed, and the power supply The line is connected to the power grid; the 3-4 connection of the control switch 1KK sends an opening command to the power supply line switch through the line protection device 1n, the power supply line switch is opened, and the power supply line is disconnected from the power grid;

4) Switch the transfer switch 1QK to "remote", and the transfer switch 3-4 is connected. If the remote dispatching center sends a closing command to the line protection device 1n through the network, after the remote closing contact YHJ is connected, the line protection device 1n will send a closing command to the power supply line. The switch issues a closing command, the power supply line switch closes, and the power supply line is connected to the power grid; if the remote dispatching center sends an opening command to the line protection device 1n through the network, after the remote jumper YTJ is connected, the line protection device 1n switches the power supply line. Issue the opening command, the power supply line switch is opened, and the power supply line is disconnected from the grid;

5) After the line protection device 1n judges that a fault occurs in the line, the protection trip contact BTJ is connected, and the line protection device 1n sends an opening command to the power supply line switch through the first connecting piece 1LP1, and the power supply line switch is opened;

6) After the reclosing action, the reclosing BHJ reclosing contact is connected, the line protection device 1n sends a closing command to the power supply line switch through the second connecting piece 1LP2, and the power supply line switch closes.

The above-mentioned embodiments and drawings do not limit the form and style of the product of the present invention, and any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of the present invention.

Claims (9)

1. a portable route protection dolly; it is characterized in that: comprise travelling car; be arranged on the protective chamber at travelling car top; wherein; wheel is equipped with in the bottom of described travelling car; travelling car is connected with the supporting plate bottom protective chamber by elevating lever, and described protective chamber comprises casing, and is arranged on the line protective devices on casing, several circuit breaker, control switch, change over switch and brace group.

2. a kind of portable route protection dolly as claimed in claim 1, is characterized in that: described brace group is used for the function of control circuit protective device, specifically comprises:

First brace, be line protective devices tripping operation control of export pressing plate, move back operation by manually carrying out throwing, during input, after trip protection contact, line protective devices send separating brake order by the first brace to supply line's switch, supply line's switch separating brake; When exiting, after trip protection contact, line protective devices do not send separating brake order by the first brace to supply line's switch;

Second brace, being line protective devices reclosing control of export pressing plate, moving back operation by manually carrying out throwing, during input, and reclosing contact, line protective devices send to supply line's switch order of closing a floodgate by the second brace, and supply line's switch closes a floodgate; When exiting, reclosing contact, line protective devices do not send to supply line's switch order of closing a floodgate by the second brace;

3rd brace, being line protective devices reclosing block pressing plate, moving back operation by manually carrying out throwing, during input, line protective devices reclosing function is blocked, and reclosing contact can not action; When exiting, line protective devices reclosing function is opened, and reclosing contact is meeting action when meeting service conditions;

4th brace, for line protective devices low-frequency load reduction controls pressing plate, moves back operation by manually carrying out throwing, after input, the low-frequency load reduction function of protective device is open; Otherwise then locking;

5th brace, for inspecting state pressing plate put by line protective devices, is placed in inspecting state by protective device after input, closes the upload function of distant place controlling functions and field adjustable signal; Otherwise then open above-mentioned functions.

3. a kind of portable route protection dolly as claimed in claim 2, is characterized in that: each brace of described brace group adopts model to be the brace of YY1-D1-A.

4. a kind of portable route protection dolly as claimed in claim 1, is characterized in that: described line protective devices adopt model to be the line protective devices of RCS-9611C.

5. a kind of portable route protection dolly as claimed in claim 1; it is characterized in that: described circuit breaker comprises four miniature circuit breakers being respectively used to disconnect, connect AC/DC voltage circuit, is respectively the first circuit breaker 1DK, the second circuit breaker 2DK, the 3rd circuit breaker 3DK and the 4th circuit breaker 1ZKK.

6. a kind of portable route protection dolly as claimed in claim 1, is characterized in that: described change over switch adopts model to be the change over switch of LW21-16/9.5939.3, for supply line's switch on the spot, the switching of distant place control.

7. a kind of portable route protection dolly as claimed in claim 1, is characterized in that: described wheel comprises 2 universal wheels being arranged on travelling car front end, and is arranged on 2 directional wheels of travelling car rear end.

8. a kind of portable route protection dolly as claimed in claim 1, is characterized in that: described travelling car adopts stainless steel welded forming.

9. a protecting control method for portable route protection dolly, is characterized in that comprising the steps:

1) first portable route protection dolly is pushed to by bottom wheel by the microcomputer protecting device needing to replace, and by elevating lever, protective chamber is adjusted to setting height, then be line protective devices cut-in operation power supply by the first circuit breaker, simultaneously by each components and parts access driving operating power that the second circuit breaker is in protective chamber, supply line's current signal and voltage signal access the line protective devices of protective chamber respectively by terminal board;

2), after portable route protection dolly is installed and terminated, the microcomputer protecting device be replaced is cut off;

3) be switched to " on the spot " by change over switch, change over switch 1-2 leads to, and the 1-2 of control switch leads to, and sends order of closing a floodgate by line protective devices to supply line's switch, and supply line's switch closes a floodgate, supply line and electrical network UNICOM; The 3-4 of control switch leads to, and send separating brake order by line protective devices to supply line's switch, supply line's switch separating brake, supply line and electrical network disconnect;

4) change over switch is switched in " distant place ", change over switch 3-4 leads to, if remote dispatching center sends to line protective devices order of closing a floodgate by network, after distant conjunction contact, line protective devices send to supply line's switch order of closing a floodgate, supply line's switch closes a floodgate, supply line and electrical network UNICOM; If remote dispatching center sends separating brake order by network to line protective devices, after distant jumping contact, line protective devices send separating brake order to supply line's switch, supply line's switch separating brake, and supply line and electrical network disconnect;

5) after line protective devices judge a line failure, trip protection contact trip protection contact, line protective devices send separating brake order by the first brace to supply line's switch, supply line's switch separating brake;

6), after reclosing action, the reclosing contact of reclosing, line protective devices send to supply line's switch order of closing a floodgate by the second brace, and supply line's switch closes a floodgate.