CN102611019B - Method for charged replacement of isolating switch and current guide device thereof - Google Patents

Abstract

A method for replacing an isolating switch with load, the steps are: start the ammeter, voltmeter, capacitive current detector and phase checking device; connect the cable on one side of the diversion switch cabinet to the phase line; read the display displayed on the capacitive current detector Connect the phase line of the cable on the other side of the diversion switch cabinet; start the arc suppression device and close the switch; check the circuit until the difference between the detected value and the standard value is within the normal fluctuation range; disconnect and replace the isolating switch; close the new isolating switch ; Remove the cables from both sides of the isolating switch to be overhauled, and the overhaul process is completed. The utility model relates to a draining device for replacing a disconnector with load, which includes a bracket, a cable, and a draining switch cabinet. The advantages are: the safety measures taken for the connection can be judged according to the readings of the capacitance current detector; the arc suppression device can effectively avoid the phenomenon of arc injury; when the wiring is incorrect or the equipment is damaged, remedial measures can be taken in time ; The process of replacing the isolating switch with load is convenient and safe.

Description

Method for replacing isolating switch with load and its drainage device

technical field

The invention relates to a method for replacing an isolating switch with load in maintenance of high-voltage transmission lines and a drainage device thereof.

Background technique

The isolating switch is a high-voltage switching device commonly used in high-voltage transmission lines. Since the isolating switch is exposed outdoors, it is easily damaged by external forces and has a high failure rate. It often needs to be repaired and replaced. There are two ways to replace the isolating switch: power-off replacement and on-load replacement. Replacing the isolating switch with load can avoid power outages for users and can greatly improve the reliability of power supply. The steps are: connect the drainage device composed of cables and switches to both sides of the isolating switch, close the circuit, repair or replace the isolating Open the circuit and remove the drainage device. Its disadvantages are: the voltage in the transmission line is high, and it is easy to generate an arc at the moment when the drainage device is suddenly connected or when the switch is closed, which will injure equipment and personnel; during the connection process, due to factors such as wiring errors and equipment damage, it will affect Subsequent operations may even lead to safety accidents.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method for replacing an isolating switch with load and a drainage device thereof without generating an arc and having safe operation.

The present invention is achieved like this:

A method for replacing an isolating switch with load, which is special in that the specific steps are as follows:

1) Push the diversion switch cabinet to the ground below the isolation switch;

2) Connect the diversion switch cabinet with the low-voltage power supply, and the low-voltage power supply supplies power to the capacitance current detector and the nuclear phase device, and starts the ammeter, voltmeter, capacitor current detector and nuclear phase device in the diversion switch cabinet;

3) Confirm that the switch in the diversion switch cabinet is in the disconnected state, and connect the cables on one side of the diversion switch cabinet to the corresponding phase wires on the side of the isolating switch to be overhauled through the connecting clips;

4) Ground the ground wire of the capacitive current detector. At this time, the capacitive current between the phase line and the ground is displayed on the capacitive current detector;

5) Read the reading displayed on the capacitive current detector, and connect the cable on the other side of the diversion switch cabinet to the phase wire on the other side of the corresponding isolating switch to be overhauled. The specific requirements are: when the reading is ≤0.1A, Hand-held connection clamp connection, when 0.1A < display ≤ 0.2A, use insulating rod for connection, when display > 0.2A, use insulating rod with arc suppression function for connection;

6) Start the arc suppression device, close the switch in the diversion switch cabinet, read the display status of the phase verification device, and ensure that the cables at the corresponding positions on both sides of the diversion switch cabinet are connected to the same phase line;

7) Read the detection value of the ammeter and voltage indication, and compare it with the current and voltage values of each phase line in the normal working state of the high-voltage transmission line, that is, the standard value. When 0.79 times of the standard value ≤ detection value ≤ 1.37 of the standard value times, the circuit is in a normal state, when the detection value > 1.37 times the standard value or the detection value < 0.79 times the standard value, it is considered that there is an error, check the circuit until the difference between the detection value and the standard value is within the normal fluctuation range;

8) Disconnect and replace the isolating switch;

9) Close the new isolation switch;

10) Disconnect the line through the diversion switch cabinet, remove the cables from both sides of the new isolating switch, and the maintenance process is completed.

The maximum ranges of the above-mentioned voltmeter and ammeter are respectively 1.8 to 2 times the rated voltage and rated current of the phase wires on both sides of the isolating switch to be overhauled.

A diversion device for replacing isolating switches with load, including brackets and cables. A capacitive current detector, an arc suppression device, a switch, and an ammeter are connected in series, a voltmeter is connected between every two branches, a ground wire is provided on the capacitive current detector, and a nuclear phase device is integrated on the diversion switch cabinet Each branch road is provided with a lead end and the lead end is respectively connected with the interface corresponding to each phase line on the phase verification device, and the two sides of the drainage switch cabinet are respectively connected with connecting clamps through cables.

The beneficial effects of the present invention are: since the capacitive current detector is integrated in the diversion switch cabinet, when the diversion device is connected to both sides of the isolating switch to be overhauled, the safety measures taken for the connection can be judged according to the indication of the capacitive current detector; When the switch is closed, due to the arc suppression device, it can effectively avoid the phenomenon of arc injury; When the equipment is damaged, take remedial measures in time; through the above measures, the process of replacing the disconnector with load is more convenient and safe.

Description of drawings

Fig. 1 is the structural representation of drainage device of the present invention;

Fig. 2 is the wiring diagram of the present invention;

Fig. 3 is a block diagram of the operation flow of the present invention.

In the figure: connection clamp 1, cable 2, bracket 3, nuclear phase device 4, capacitance current detector 5, diversion switch cabinet 6, arc suppression device 7, switch 8, ammeter 9, voltmeter 10, low-voltage power supply 11, phase Line 12, isolating switch 13.

Detailed ways

As shown in Figure 1, the drainage device for replacing the isolating switch with load includes a bracket 3, and a drainage switch cabinet 6 is connected to the bracket 3 by bolts. Three branches are arranged in the drainage switch cabinet 6, and each branch A capacitive current detector 5, an arc suppression device 7, a switch 8, and an ammeter 9 are respectively connected in series in each branch circuit, and a voltmeter 10 is connected between every two branches, and a grounding wire is arranged on the capacitive current detector 5. The diversion switch cabinet 6 is integrated with a nuclear phase device 4, and each branch road is provided with a lead end, and the lead ends are respectively connected with the interfaces of the phase nuclear device 4 corresponding to each phase line. 2 is connected with the connection clamp 1.

As shown in Figure 2 to Figure 3, the method of replacing the isolating switch with load, the specific steps are as follows:

1) Push the diversion switch cabinet 6 to the ground below the isolation switch;

2) Connect the diversion switch cabinet 6 with the low-voltage power supply 11, supply power to the nuclear phase device 4 and the capacitor current detector 5, and start the ammeter 9, voltmeter 10, capacitor current detector 5 and nuclear phase device 4 in the diversion switch cabinet 6 , the maximum values of the measuring ranges of the ammeter 9 and voltmeter 10 used in the operation are respectively 1.8 to 2 times the rated voltage and rated current of the phase line 12 on both sides of the isolating switch 13 to be overhauled;

3) Confirm that the switch 8 in the diversion switch cabinet 6 is in the off state, and connect the cables 2 on one side of the diversion switch cabinet 6 to the corresponding phase wires 12 on the side of the isolating switch 13 to be overhauled through the connection clamp 1;

4) Ground the ground wire of the capacitive current detector 5, at this time, the capacitive current between the phase line 12 and the ground is displayed on the capacitive current detector 5;

5) Read the reading displayed on the capacitive current detector 5, and connect the cable 2 on the other side of the diversion switch cabinet 6 with the corresponding phase line 12 on the other side of the isolating switch 13 to be overhauled. The specific requirements are: when the reading When ≤0.1A, connect with connecting clamp 1. When 0.1A﹤indication ≤0.2A, connect with insulating rod;

6) Start the arc suppression device 7, close the switch 8 in the diversion switch cabinet 6, read the display status of the phase verification device 4, and ensure that the cables 2 at the corresponding positions on both sides of the diversion switch cabinet 6 are connected to the same phase line 12;

7) Read the detected values from the ammeter 9 and voltmeter 10, and compare them with the current and voltage values of each phase line 12 in the normal working state of the high-voltage transmission line, that is, the standard value, when 0.79 times of the standard value ≤ detection value ≤ 1.37 times the standard value, the circuit is in a normal state. When the detection value > 1.37 times the standard value or the detection value < 0.79 times the standard value, it is considered that there is an error. Check the circuit until the difference between the detection value and the standard value fluctuates normally. within the scope;

9) Close the new isolating switch 13;

10) Turn off the switch 8, disconnect the line through the drainage switch cabinet 6, remove the cable 2 from both sides of the new isolating switch 13, and the maintenance process is completed.

Claims (2)

1. on-load changes a method for isolating switch, it is characterized in that concrete steps are as follows:

1) drainage switch cubicle is pushed into ground below isolating switch;

2) drainage switch cubicle is communicated with low-tension supply, powers to phase checking device and capacitance current detector, start ammeter, voltmeter, capacitance current detector and the phase checking device in drainage switch cubicle;

3) confirm that in drainage switch cubicle, switch is in off-state, is connected with the phase line of corresponding Awaiting Overhaul isolating switch side by connecting clamp respectively by the cable of drainage switch cubicle side;

4) by the ground connection of capacitance current detector, now, capacitance current detector shows the capacitance current between phase line and ground;

5) registration that capacitance current detector shows is read, the phase line of the cable of drainage switch cubicle opposite side with corresponding Awaiting Overhaul isolating switch opposite side is connected, specific requirement is: as registration≤0.1A, hand-held connecting clamp connects, as 0.1A ﹤ registration≤0.2A, adopt insulating bar to connect, as registration ﹥ 0.2A, use and have the insulating bar of arc eliminator to connect;

6) start arc-extinction device, the switch in closed drainage switch cubicle, read the show state of phase checking device, guarantee that the cable of drainage switch cubicle both sides correspondence position is connected with phase isopen;

7) reading ammeter, voltmeter registration obtain detected value, and compare with the electric current under ultra-high-tension power transmission line normal operating conditions, magnitude of voltage and standard value, when detected value be greater than 1.37 times of standard value or be less than 0.79 times of standard value time, then think and make a fault, check circuit is until the difference of detected value and standard value is within normal fluctuation range;

8) disconnect and change isolating switch;

9) closed new isolating switch;

10) disconnected by circuit by drainage switch cubicle, pulled down by new isolating switch both sides by cable, maintenance process completes.

2. on-load according to claim 1 changes the method for isolating switch, it is characterized in that: described voltmeter, the range of ammeter be respectively Awaiting Overhaul isolating switch both sides phase line rated voltage, 1.8 times of rated current.