CN107064708B - Control loop template self-diagnosis system for 10kV switchgear - Google Patents

Abstract

The embodiment of the invention provides the control loop template self-diagnosis systems for 10kV switchgear, including shell, it is equipped in the front edge of shell for self-diagnosis system to be installed to screw hole on cabinet door, is inlaid with the display device for showing self-diagnosis system state in the front of shell；The sample circuit being connected on circuit is equipped in shell, the output end of sample circuit is connected with the input terminal of logic processor, and the output end of logic comparator is connect with display equipment.By the voltage of monitoring closing circuit and one or two professional separations of trip(ping) circuit, judge that defect is that primary or secondary reason causes；Using light every and the strategies such as delay switching-off, it is ensured that device does not apply unnecessary influence to the control loop of normal operation, has prevented the generation for accidentally going out lip reflex, has assisted the direct positioning failure point range of O&M service personnel, shorten the repair time, improve overhaul efficiency.

Description

Control loop disconnection self-diagnosis device for 10kV switchgear

technical field

The invention belongs to the field of electric equipment, in particular to a control loop disconnection self-diagnosis device for a 10kV switch cabinet.

Background technique

With the continuous development of the economy, the number of 10kV power supply lines continues to increase. The defect of disconnection of the control circuit in 10kV line protection also emerges continuously with the increase of protection devices. Once there is a defect of disconnection of the control circuit, it means that the 10kV line cannot be operated (distance, local cannot be opened and closed).

There are many reasons for the disconnection of the control circuit of the protection device, such as: the secondary wiring of the control circuit is loose, the auxiliary contact of the switch handcart is not in place, etc., involving primary and secondary specialties. The existing methods of prompting the disconnection of the control circuit are only the alarm of the 10kV protection device and the turning on and off of the opening and closing reminder lights (traffic lights) on the 10kV switch cabinet. The operation personnel on duty cannot predict the actual cause of the disconnection of the control circuit (primary reason or secondary reason) through the existing methods. When reporting defects, they will generally fill in the primary and secondary teams together. When the substation maintenance room is dispatched to eliminate defects, it will generally send personnel from the first and second teams to eliminate defects. The reason for the disconnection of the control back is often single, but the dispatching of the defect elimination needs to send two groups of personnel with different specialties to ensure the completion of the defect elimination. Under the background of heavy production pressure and shortage of production personnel in our office, such a way of dispatching labor means a waste of human resources.

Contents of the invention

In order to solve the shortcomings and deficiencies in the prior art, the present invention provides a self-diagnostic device capable of quickly assigning maintenance teams, which can improve maintenance efficiency and reduce waste of human resources.

In order to achieve the above-mentioned technical purpose, the present invention provides a self-diagnosing device for disconnection of a control circuit for a 10kV switchgear. The self-diagnosing device includes:

The casing has screw holes for installing the self-diagnosing device on the switch cabinet door on the front edge of the casing, and a display device for displaying the status of the self-diagnosing device is inlaid on the front of the casing;

A sampling circuit connected to the loop is provided in the casing, the output terminal of the sampling circuit is connected with the input terminal of the logic processor, and the output terminal of the logic comparator is connected with the display device;

Wherein, one input end of the sampling circuit is electrically connected to the first sampling point, and the other input end of the sampling circuit is electrically connected to the second sampling point.

Optionally, in the self-diagnosing device, a power supply for supplying power to the sampling circuit, the logic processor, and the display device is also provided.

Optionally, a switch for controlling power on is provided on the housing.

Optionally, the self-diagnosing device acquires the first sampling value at the first sampling point, acquires the second sampling value at the second sampling point, and transmits the first sampling value and the second sampling value to the logic processor.

Optionally, if the first sampling value is 0V and the second sampling value is -55±10V, then it is determined that the secondary shift is responsible;

If the first sampling value is -55±10V and the second sampling value is 0V, it is determined that the secondary shift is responsible.

Optionally, if the first sampling value is 0V and the second sampling value is 0V, then it is determined that the primary team is in charge;

If the first sampling value is -55±10V and the second sampling value is -55±10V, it is determined that the primary shift is in charge.

Optionally, the display device is a liquid crystal screen.

Optionally, a guide rail for installing the self-diagnosing device on the switch cabinet door is provided on the back of the housing.

The beneficial effects brought by the technical scheme provided by the invention are:

By monitoring the voltage of the primary and secondary professional demarcation points of the closing circuit and tripping circuit, it is judged whether the defect is caused by primary or secondary reasons; strategies such as optical isolation and delayed shutdown are adopted to ensure that the device does not impose unnecessary stress on the normal operation of the control circuit Influence, put an end to the occurrence of wrong export, assist operation and maintenance personnel to directly locate the range of fault points, shorten maintenance time, and improve maintenance efficiency.

Description of drawings

In order to illustrate the technical solution of the present invention more clearly, the accompanying drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. Ordinary technicians can also obtain other drawings based on these drawings on the premise of not paying creative work.

Fig. 1 is the schematic diagram of the mechanism of the housing in the control loop disconnection self-diagnosis device for 10kV switchgear provided by the present invention;

Fig. 2 is a structural diagram inside the housing provided by the present invention;

Fig. 3 is a side view of the housing provided by the present invention.

Detailed ways

In order to make the structure and advantages of the present invention clearer, the structure of the present invention will be further described below in conjunction with the accompanying drawings.

Embodiment one

The present invention provides a control loop disconnection self-diagnosis device for a 10kV switchgear, characterized in that the self-diagnosis device includes:

The casing has screw holes for installing the self-diagnosing device on the switch cabinet door on the front edge of the casing, and a display device for displaying the status of the self-diagnosing device is inlaid on the front of the casing;

A sampling circuit connected to the loop is provided in the casing, the output terminal of the sampling circuit is connected with the input terminal of the logic processor, and the output terminal of the logic comparator is connected with the display device;

Wherein, one input end of the sampling circuit is electrically connected to the first sampling point, and the other input end of the sampling circuit is electrically connected to the second sampling point.

In practice, the structure of the housing 1 is shown in Figure 1. The housing 1 is generally rectangular, and the front edge of the housing is provided with a screw hole 2 for installing the self-detection device on the switch cabinet door. The front is inlaid with a display device 3 for displaying the state of the self-testing device.

The mechanism inside the housing 1 is shown in Figure 2, including a sampling circuit 21, the output end of the sampling circuit 21 is connected to the input end of the logic processor 22, and the output end of the logic processor 22 is connected to the display device 3, because the display device 3 It is installed on the housing 1, so it is not shown in Fig. 2 .

The self-diagnosis device should not affect the normal operation of the tested equipment. The two sampling points are optically separated to prevent the internal potential of the device from being sent back into the control loop, causing false exits; when the protection is in normal operation, the self-diagnostic device is in a shutdown state. After the disconnection of the control circuit occurs, the operator presses the switch of the control power supply to start the test. After the analysis result is obtained, the device will automatically shut down after a delay of 3 minutes. The goal is to minimize the time during which the control loop may be affected.

Here, the first sampling point is a sampling point for monitoring the closing circuit voltage, and the second sampling point is a sampling point for monitoring the tripping circuit voltage.

Optionally, in the self-testing device, a power supply for supplying power to the sampling circuit 21 , the logic processor 22 and the display device 3 is also provided. A switch for controlling power on is provided on the housing 1 . When the normal protection is running normally, the power module is in the shutdown state.

According to the above judgment results, the cause of the problem and the current voltage state will be displayed on the display device. In order to reduce the thickness and power consumption of the entire self-testing device, the display device here is a liquid crystal screen.

The criterion of the self-diagnostic device is whether the negative potential (DC-55V±10V or DC-110V±20V) reaches the terminal block through the switch mechanism. If yes, it is the responsibility of the secondary team; if not, it is the responsibility of the primary team; the judgment logic table is as follows

Table 1: Judgment logic table

Optionally, as shown in FIG. 3 , a guide rail for installing the self-detection device on the switch cabinet door is provided on the back of the housing. In order to improve the adaptability of the self-testing device, the guide rail here adopts DIN guide rail.

DIN rail is a German industrial standard, and the use of rails is an installation method for industrial electrical components. Electrical components that support this standard can be easily stuck on the rails without fixing them with screws, and maintenance is also very convenient. The size of the DIN rail is marked by width*depth*thickness, the general standard is: 1.0mm thickness, width: 35mm. The commonly used ones are: 35*7.5*1; 35*15*1; 35*15*1.5; 32*15*1.5; 35*16*1.8, etc. The dimensions of the guide rail are directly related to the effective cross-sectional area of the guide rail.

The embodiment of the present invention provides a control loop disconnection self-diagnosis device for 10kV switchgear, which includes a housing, and a screw hole for installing the self-diagnosis device on the switch cabinet door is provided on the front edge of the housing, and on the side of the housing The front is inlaid with a display device for displaying the status of the self-diagnostic device; a sampling circuit connected to the loop is arranged in the housing, the output terminal of the sampling circuit is connected with the input terminal of the logic processor, and the output terminal of the logic comparator is connected with the display device . By monitoring the voltage of the primary and secondary professional demarcation points of the closing circuit and tripping circuit, it is judged whether the defect is caused by primary or secondary reasons; strategies such as optical isolation and delayed shutdown are adopted to ensure that the device does not impose unnecessary stress on the normal operation of the control circuit Influence, put an end to the occurrence of wrong export, assist operation and maintenance personnel to directly locate the range of fault points, shorten maintenance time, and improve maintenance efficiency.

The serial numbers in the above embodiments are for description only, and do not represent the sequence of the components during assembly or use.

The above description is only an embodiment of the present invention, and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention Inside.

Claims (5)

1. A self-diagnostic device for control loop disconnection of a 10kV switchgear, characterized in that the self-diagnostic device includes: a housing, and a front edge of the housing is provided for installing the self-diagnostic device on the switch cabinet door The screw hole is embedded with a display device for displaying the status of the self-diagnostic device on the front of the housing; a sampling circuit connected to the loop is arranged in the housing, the output terminal of the sampling circuit is connected with the input terminal of the logic comparator, and the logic comparator The output end of the sampling circuit is connected to the display device; wherein, one input end of the sampling circuit is electrically connected to the first sampling point, and the other input end of the sampling circuit is electrically connected to the second sampling point; the self-diagnosis device obtains the first sampling point The first sampling value at the second sampling point is obtained, and the first sampling value and the second sampling value are transmitted to the logic comparator; if the first sampling value is 0V, the second sampling value is -55±10V, then it is determined that the secondary team is responsible; if the first sampled value is -55±10V, and the second sampled value is 0V, it is determined that the secondary team is responsible; if the first sampled value If the first sampling value is 0V and the second sampling value is 0V, it is determined that the primary team is in charge; if the first sampling value is -55±10V and the second sampling value is -55±10V, then it is determined that the primary team is in charge. 2. The control loop disconnection self-diagnosis device for 10kV switchgear according to claim 1, characterized in that, in the self-diagnosis device, there are also devices for supplying power to the sampling circuit, logic comparator, and display device power supply. 3. The self-diagnosing device for disconnection of the control circuit for a 10kV switchgear according to claim 2, characterized in that a switch for controlling power-on is provided on the housing. 4. The self-diagnosing device for disconnection of the control circuit for a 10kV switchgear according to claim 1, wherein the display device is a liquid crystal screen. 5. The self-diagnosing device for control loop disconnection of a 10kV switchgear according to claim 1, wherein a guide rail for installing the self-diagnosing device on the switchgear door is provided on the back of the housing.