CN110350656A - It an a kind of distant place throws and moves back reclosing device - Google Patents

Abstract

The invention discloses a remote switching and reclosing device, which includes a self-holding relay and a power supply module for power supply. The self-holding relay includes a linked normally closed contact and a normally open contact. The physical circuit of the reclosing switch derived from the switch protection device is connected to the hard pressure plate of the reclosing switch and the normally closed contact, and the withdrawing remote signaling circuit derived from the substation measurement and control device is connected to the normally open contact. The normally open contact is used as the reclosing state feedback terminal, and the remote control input circuit and the remote control exit circuit derived from the substation measurement and control device are used as the contact state switching circuit of the self-holding relay. Through remote control, the physical circuit of the recloser is closed or cut off, and at the same time, the state of the circuit controlled by the device is fed back to the control terminal in real time. On the one hand, the reliable change of the recloser state is realized to ensure work safety; on the other hand, remote control is realized to reduce operation. cost.

Description

A remote throwing and withdrawing reclosing device

technical field

The invention relates to a device capable of remotely controlling the reclosing state of a switch in a substation.

Background technique

The switch recloser in the substation mainly cooperates with the switch protection action, and it is often necessary to change the input and exit status of the recloser with the arrangement of power work.

At present, the input and exit status of the recloser can be changed mainly through the following two methods.

One is the hard pressing plate method, in which the operator changes the state of the hard pressing plate of the reclosing switch cabinet in the substation to cut off the reclosing control circuit. Since the control circuit is cut off at the physical level, the switch-on and switch-off method of the reclosing switch is more reliable. This method is generally used in actual work, but the disadvantage is that the operation must be carried out on site and cannot be operated remotely.

The other is the soft pressure plate method. By changing the specific control word in the protection device, the switching and withdrawing status of the recloser can be changed through software. This method can be operated on site or modified remotely, but because it is aimed at the change of the control word, the physical circuit of the recloser is still closed, so the exit of the recloser is unreliable, and it is difficult to monitor the status of the recloser in real time, causing potential safety hazards. This method is generally not used in actual work.

Contents of the invention

The purpose of the present invention is to provide a remote switching reclosing device. When it is necessary to change the reclosing state of the switch in the power station, the physical circuit of the reclosing switch is closed or cut off through remote control, and at the same time, the circuit state controlled by the device is fed back to the control system in real time. end.

For this reason, the present invention provides a remote switching reclosing device, which cooperates with the substation measurement and control device and the switch protection device in the substation to realize the remote switching and reclosing of the switch in the substation, including a self-holding relay and a power supply for power supply module, the self-holding relay includes linked normally closed contacts and normally open contacts, wherein the physical circuit of the reclosing switch drawn from the switch protection device in the substation is connected to the reclosing switching hard pressure plate and the normally Closed contact, the exit remote signaling circuit derived from the substation measurement and control device is connected to the normally open contact, and the normally open contact is used as the reclosing state feedback terminal, and the remote input circuit and remote control circuit derived from the substation measurement and control device The exit circuit is used as the contact conduction state switching circuit of the self-holding relay, wherein, when the substation measurement and control device receives the reclosing input control signal from the control terminal, the remote control input circuit is closed; the substation measurement and control device When receiving the reclosing exit control signal from the control terminal, the remote control exit circuit is closed.

This device can be controlled from a remote place, so unlike the hard press plate method, operators need to rush to the substation site to operate, which saves operation time, manpower, and transportation costs; The pressure plate method is more reliable, and the monitoring of the control state is more reliable through the physical design. When the relevant control state changes unexpectedly, a signal can be sent to remind in time to avoid potential safety hazards. In addition, the device uses a self-holding relay, which can Maintain the previous on-off state in the event of device power failure, prevent sudden changes in the reclosing state due to faults, and ensure related work safety.

In addition to the objects, features and advantages described above, the present invention has other objects, features and advantages. Hereinafter, the present invention will be described in further detail with reference to the drawings.

Description of drawings

The accompanying drawings constituting a part of the present application are used to provide a further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the attached picture:

Fig. 1 is a structural block diagram of a remote switching reclosing device according to the present invention.

Explanation of reference signs

1. Remote switching and reclosing device; 2. Substation measurement and control device;

3. Switch protection device in the substation; 4. Step-down power supply module;

5. Self-holding relay; 6. Normally closed contact;

7. Normally open contact; 8. Reclosing physical circuit;

9. The reclosing switch casts and withdraws the hard pressure plate.

Detailed ways

It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

The device structure and wiring are shown in Figure 1. In the hard pressing plate mode currently used, the reclosing switch physical circuit 8 drawn from the switch protection device 3 in the substation is connected to the reclosing switch switching hard pressing plate 9 and the normally closed contact 6. When the reclosing switch switching hard pressing plate 9 is opened, The path is broken, and the recloser exits.

When the device is in normal use, if there is no special requirement, then the reclosing switch will be thrown back and the hard pressing plate 9 is always placed in a conducting state. When receiving the control signal from the control terminal to switch to "reclosing switch", the substation measurement and control device 2 sends a positive pulse to the self-holding relay 5 to control the displacement of the reed in the self-holding relay 5, the normally closed contact 6 is closed, and the normally open The type contact 7 is opened, at this time the recloser physical circuit 8 is closed, and the recloser is put into operation. At the same time, the monitoring circuit of the substation measurement and control device 2 is opened, and the signal of "recloser put into operation" is returned.

When receiving the control signal from the control terminal to switch to "reclosing exit", the substation measurement and control device 2 sends a negative pulse to the self-holding relay 5 to control the displacement of the reed in the self-holding relay 5, and the normally closed contact 6 opens, normally open When the contact 7 is closed, the recloser physical circuit 8 is opened, and the recloser exits. At the same time, the monitoring circuit of the substation measurement and control device 2 is closed, and the signal of "recloser exit" is returned.

Since the normally closed contact 6 and the normally open contact 7 share the same reed, when the device loses power or fails, the substation measurement and control device 2 can still accurately reflect the switching status of the reclosing switch, and the switching status is within the automatic Under the control of the holding relay 5, the previous switching state will be maintained, which ensures the reliability of the device.

The device is powered by the DC power supply in the substation and receives the remote control signal of the power monitoring system. When the signal is switched to the reclosing switch, the measurement and control device sends a positive pulse to the self-holding relay to control the normally closed contact conduction connected to the reclosing physical circuit. On, the reclosing state controlled by the device is still enabled. When the remote control signal is switched to reclosing exit, the measurement and control device sends a negative pulse to the self-holding relay, the normally closed contact in the reclosing physical circuit is disconnected, and the reclosing physical circuit is cut off. At this time, the reclosing state is exit.

The normally open contact sharing a conduction reed with the normally closed contact is used as the feedback terminal of the reclosing state controlled by the device. Due to the common use of the conduction reed, the physical lock is realized. The normally closed contact is opposite to the normally open contact. When the open contact is not conducting, it corresponds to the reclosing input state in the power monitoring system. In this way, real-time and reliable monitoring of the state of the reclosing switching device can be realized.

In one embodiment, the self-holding relay is a magnetically-holding double-coil relay MY2K24DC of Omron Company, the step-down power module is an AC-DC power module NE03-A24 of Niboxing Company, and the measurement and control device and protection device are integrated equipment: Nanjing Nanzi PSL641U comprehensive protection digital line protection measurement and control device.

Because this device can be controlled remotely, it is not like the hard pressing plate method that requires operators to rush to the substation site for operation; and because this device directly controls the on-off of the physical circuit of the reclosing switch, it is more reliable than the soft pressing plate method and can be monitored. Feedback can be obtained in time when the relevant control state changes unexpectedly; this device adopts the contact of the self-holding relay to connect to the circuit, so that the previous on-off state can be maintained when the device loses power and other failures, avoiding hidden dangers to work safety.

On the basis of retaining the input and exit of reclosing in the way of hard pressing plate and soft pressing plate, this device adds a new measure of remote switching and withdrawing reclosing. Realize remote control and reduce operating costs.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (1)

1. A remote throwing and withdrawing reclosing device is characterized in that it cooperates with the substation measurement and control device (2) and the switch protection device (3) in the substation to realize the remote throwing and withdrawing reclosing of the switch in the substation, including self-holding relay ( 5) and a power supply module (4) for power supply, The self-holding relay (5) includes a linked normally closed contact (6) and a normally open contact (7), wherein the reclosing physical circuit (8) drawn from the switch protection device (3) in the substation Connect the hard pressure plate (9) and the normally closed contact (6) of the reclosing switch on the top, and connect the normally open contact (7) with the exit remote signaling circuit drawn from the substation measurement and control device (2), The normally open contact (7) is used as a reclosing state feedback terminal, The remote control input circuit and the remote control exit circuit drawn from the substation measurement and control device (2) are used as the contact conduction state switching circuit of the self-holding relay (5), wherein, the substation measurement and control device (2) receives the input from the control terminal When the recloser input control signal, the remote control input loop is closed; when the substation measurement and control device (2) receives the recloser exit control signal from the control terminal, the remote control exit circuit is closed.