CN101246783A - Intelligent locking method for the grounding switch of the incoming line interval of the outdoor ring network cabinet - Google Patents

Abstract

The invention relates to an intelligent locking method for an incoming line interval grounding switch of an outdoor ring network cabinet. The steps are as follows: (1) extracting the outgoing line signal or the incoming line signal from the cables of each phase in the outdoor ring network cabinet; (2) extracting The output signal or incoming signal of each phase cable is sent to an independent electroscope with working power supply; (3) The electroscope controls the relay on the electroscope as the electroscope interface according to the outgoing signal or incoming signal of each phase cable. A pair of normally open contacts act to output the signal whether the cables of each phase in the outdoor ring main unit are electrified through the on and off of the relay contacts; The electrical signal is used for logical judgment to determine whether to open the computerized locking device of the grounding knife. Since the invention does not need to change the wiring mode, it is convenient to operate, can reliably prevent the misoperation of the electrified grounding switch, greatly reduces the occurrence of vicious misoperation accidents, and ensures the safe and stable operation of the distribution network.

Description

Intelligent locking method for the grounding switch of the incoming line interval of the outdoor ring network cabinet

technical field

The invention relates to an intelligent locking method for an outdoor ring network cabinet incoming line interval grounding switch, which belongs to the locking method for outdoor metal-enclosed ring network switchgear in the field of power distribution network.

Background technique

The 10kV outdoor ring network cabinet has been widely used in the city's distribution network power supply network due to its simplicity and reliability. There is a mechanical anti-misoperation device between the load switch and the grounding switch of the outdoor ring network cabinet. This anti-misoperation device can reliably prevent various misoperations when the power supply of the outdoor ring network cabinet is connected to the line. However, due to the ring network power supply and the hand-in-hand network wiring method, when the incoming line interval of the ring network cabinet or the connection line between the ring network cabinets, the power supply is the bottom incoming line, at this time the anti-malfunction device of the outdoor ring network cabinet itself cannot prevent Malicious misoperation of the charged and grounded switch knife. Therefore, it is necessary to control the operation of the grounding switch, that is, when the load switch is opened, it must be judged whether the cable outlet or the cable input is powered, and the grounding switch is allowed only when the cable is not charged. There are two traditional anti-misoperation methods. One is to use electromagnets to prevent misoperation of the grounding switch. However, since the outdoor ring network cabinet has no power supply, it is inconvenient to implement. At the same time, it is necessary to consider the long-term electrification of the electromagnet. Therefore, most of the grounding knife padlocks for outdoor ring network cabinets are manually judged by the operator when operating the grounding knife, and the grounding knife operation is performed after unlocking when the cable is de-energized. Since the outdoor ring network cabinets are all fully enclosed structures, whether the cables in the cabinet have high voltage or not is indicated by the high voltage live indicator installed on the panel of the outdoor ring network cabinet, and the indicator can only be used as a high voltage active The warning sign of the electrical signal cannot be mechanically interlocked with the cabinet lock. Therefore, whether the display of the high-voltage live display is correct or not cannot be used as an accurate criterion for the presence or absence of electricity in the cables in the outdoor ring network cabinet.

Contents of the invention

The object of the present invention is to provide an intelligent locking method for an outdoor ring network cabinet incoming line interval grounding switch which is easy to operate and can reliably prevent the misoperation of the charged grounding knife.

The technical solution of the present invention to achieve the above purpose is: an intelligent locking method for the incoming line interval grounding switch of the outdoor ring network cabinet, which is characterized in that:

(1) Extract the outgoing line signal or incoming line signal from each phase cable in the outdoor ring network cabinet;

(2) Send the extracted outgoing line signal or incoming line signal of each phase cable to an independent electroscope with working power supply;

(3) The electroscope controls the action of a pair of normally open contacts of the relay on the electroscope as the electrical inspection interface according to the outgoing or incoming signal of each phase cable, and passes the signal whether the cables of each phase in the outdoor ring network cabinet are charged. On and off output of relay contacts;

(4) The computer key is connected to the contacts of the relay, and the computer key makes a logical judgment on the obtained electric test signal to determine whether to open the computer locking lockset of the grounding switch.

After the present invention adopts the above-mentioned technical scheme, the electrical signal obtained from the cable can be input into the electroscope through the electroscope through the outdoor ring network cabinet, and a pair of normally open contacts of the relay of the electroscope are driven to act. It is also used as an electrical inspection interface, so the electronic key is inserted into the electrical inspection interface, and the signal whether the cables of each phase in the outdoor ring network cabinet are charged can be output through the on and off of the relay contacts, providing accurate information on whether the locking operation can be performed. criterion. When any phase cable has no electricity, the electronic key is inserted into the electroscope interface, and the electroscope outputs a closed unlock signal to perform the unlocking operation; when any phase cable has high voltage, the electroscope outputs a disconnected locking signal, so through The working status of the electroscope interface of the electroscope is used as the basis for unlocking. In the whole operation procedure, the operation method is simple, and under normal circumstances, it does not need manual intervention to work automatically, so that the overall error prevention system of the outdoor ring network cabinet can be perfected and effective. Control the occurrence of vicious misoperation accidents of electrified and grounded switch blades, and improve the safe and reliable operation of the distribution network.

Description of drawings

Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

Figure 1 is a logic diagram of the present invention.

Detailed ways

As shown in Fig. 1, the intelligent locking method of the outdoor ring network cabinet inlet line interval grounding switch of the present invention first extracts the outgoing line signal or the incoming line signal from each phase cable in the outdoor ring network cabinet; The signal or incoming line signal is sent to an independent electroscope with an independent working power supply. The electroscope controls the action of a pair of normally open contacts of the relay in the electroscope according to the outgoing line signal or incoming line signal of each phase cable. A pair of normally open contacts of the relay are used as the electrical inspection interface, and the signal whether each phase cable in the outdoor ring network cabinet is charged is output through the on and off of the relay contacts. When the computer key is connected with the contacts of the relay, the computer key Make a logical judgment on the obtained electric inspection signal, and decide whether to open the computer lock of the grounding switch. When there is a high-voltage signal output at any phase cable outlet or cable inlet, the normally open contact of the relay on the electroscope Keep the original state. After the computer key is connected to the contact, it is judged that the outdoor ring network cabinet has power, and the computer locking lock of the grounding switch cannot be opened. When any one phase cable goes out or the cable enters without electric signal, the power supply on the electroscope will turn on the relay, so that the normally open contact of the relay will be closed. After the computer key is connected to the contact, it will be judged that the outdoor ring network cabinet has no electrical signal. Electricity, through logical judgment, whether to open the computer locking device corresponding to the grounding knife, because the code of each outdoor ring network cabinet and the code of each grounding knife locking device are stored in the computer key, only when the computer key judges whether the outdoor ring network cabinet When there is no electricity, and select the code of the outdoor ring main unit to be unlocked and the code of the grounding knife computer locking device to correspond one-to-one. Computer locks are all commercially available products. Since the present invention does not need to change the wiring mode, it is conveniently installed on the outdoor ring network cabinet at the site, can greatly reduce the occurrence of vicious misoperation accidents, and ensures the safe and stable operation of the distribution network.

Claims (4)

1, a kind of intelligent locking method of outdoor looped network cabinet wire spacing ground switch is characterized in that:

(1), extracts outlet signal or inlet wire signal each the phase cable in outdoor ring main unit;

The electroscope that each phase cable outlet signal that (2), will extract or inlet wire signal are delivered to an independence and had working power;

(3), electroscope is according to each phase cable outlet signal or inlet wire signal, as its a pair of normally opened contact action of relay of electrical verification interface, the signal whether each phase cable in the outdoor ring main unit is charged is by the switching output of relay contact on the control electroscope;

(4), the contact of computer key and relay joins, computer key carries out logic determines to the electrical verification signal that obtains, whether decision opens the computer locking lockset of ground connection plug-in strip.

2, the intelligent locking method of outdoor looped network cabinet wire spacing ground switch according to claim 1, it is characterized in that: when any phase cable outlet or long cable section of ingoing line have high-voltage signal output, its normally opened contact of galvanoscopic relay maintains the original state, computer key and this contact join and judge that outdoor ring main unit has electricity, and the computer locking lockset of ground connection plug-in strip can not be opened.

3, the intelligent locking method of outdoor looped network cabinet wire spacing ground switch according to claim 1, it is characterized in that: when any phase cable outlet or long cable section of ingoing line do not have the signal of telecommunication, galvanoscopic working power turn-on relay, the normally opened contact closure of relay, computer key and this contact join and judge that outdoor ring main unit does not have, by logic determines, open the computer locking lockset of corresponding ground connection plug-in strip.

4, according to the intelligent locking method of the described outdoor looped network cabinet wire spacing ground switch of one of claim 1 to 3, it is characterized in that: store the coding of each outdoor ring main unit and the coding of each ground connection plug-in strip locking lockset in the described computer key, select at computer key under the encoding condition correspondence of the outdoor ring main unit coding of required release and ground connection plug-in strip computer locking lockset, computer key is untied computer locking lockset.

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