A method for double confirmation of the position of a switch in one-key sequence control and a switch circuit

Abstract

The application belongs to the technical field of high-voltage switch equipment of power system, and particularly relates to a method for double confirmation of the position of a knife switch in one-key sequence control and a knife switch circuit. When receiving a one-key sequence control operation instruction, the knife switch corresponding to the one-key sequence control operation performs closing or opening operation according to the corresponding instruction. When the knife switch is closed to the position, the auxiliary contact of the knife switch outputs a closing-to-position confirmation signal, and the closing travel switch changes the state of the switch and outputs the closing-to-position confirmation signal again. When the knife switch is opened to the position, the auxiliary contact of the knife switch outputs an opening-to-position confirmation signal, and the opening travel switch changes the state of the switch and outputs the opening-to-position confirmation signal again. Through the double confirmation method of the auxiliary switch and the travel switch, without conversion of data, the position signal is sent through the contacts of the auxiliary switch and the travel switch, and the information of the position of the knife switch can be determined, so that the reliability of the received position signal of the knife switch is ensured based on the double confirmation method of the travel switch.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of high-voltage switch equipment of power systems, and particularly relates to a method for double confirmation of the position of a knife switch in one-key sequence control and a knife switch circuit. BACKGROUND

[0002] The development of substations has experienced three stages of conventional substations, intelligent substations and smart substations. With the rapid development of smart grids, the number of substations increased from more than 20,000 to more than 50,000 from 2007 to 2020, while the number of operation and maintenance personnel remained relatively stable, and the production task became increasingly heavy. As an important means of substation operation and maintenance, the current switching operation still adopts the traditional manual operation one by one, which has been far from meeting the development needs of the power system. Under this background, the one-key sequence control technology of substations was born, and the double confirmation of the position of the knife switch is an important criterion for one-key sequence control operation. However, the current double confirmation of the position of the knife switch has the problems of non-uniform implementation mode, unreliable criterion, multiple data conversion links and high cost.

[0003] At present, the double confirmation of the position of the knife switch in the one-key sequence control of the substation is mostly realized by the way of posture sensor and auxiliary switch. The posture sensor is installed inside the knife switch mechanism box to obtain the position signal of the knife switch, and then the 485 signal is uploaded to the receiving device in the GIS control cabinet through the cable. The 485 signal is converted into the opening and closing position switch signal by the receiving device and uploaded to the one-key sequence control background. In cooperation with the opening and closing position signal of the auxiliary switch in the knife switch mechanism, the requirement of double confirmation of the position of the knife switch in the one-key sequence control is met.

[0004] However, by using the way of posture sensor and auxiliary switch to realize the double confirmation of the position of the knife switch in the one-key sequence control of the substation, the posture sensor and the receiving device need to be added to the original knife switch mechanism to determine the opening and closing position of the knife switch, which increases the cost of the posture sensor and the receiving device. Moreover, the process of determining the position of the knife switch based on the posture sensor needs data conversion, which may cause low reliability and complex device structure. In addition, the complex device structure may cause difficulty in operation and maintenance in the later stage. SUMMARY

[0005] The purpose of the present application is to provide a method for double confirmation of the position of a knife switch in one-key sequence control and a knife switch circuit, which solves the problem of low reliability and high cost of the double confirmation method in the prior art by adding new equipment to realize the double confirmation of the position of the knife switch in the one-key sequence control of the substation.

[0006] To solve the above technical problems, the application provides a method for double confirmation of the position of a switch in one-key sequence control, when receiving a one-key sequence control operation instruction, the switch corresponding to the one-key sequence control operation performs closing or opening operation according to the corresponding instruction; if the switch performs closing operation, the closing control loop is closed and conducted, the coil of the closing relay in the closing control loop is powered, the normally open contact of the closing relay connecting the power supply and the first wiring terminal of the motor in the motor loop is closed, and the motor rotates in the closing direction; when the switch is closed to the position, the auxiliary contact of the switch outputs a closing-to-position confirmation signal, and the trigger part of the motor spindle triggers the closing travel switch to switch the switch state, and the closing-to-position confirmation signal is output again, and the double confirmation of the one-key sequence control is completed.

[0007] If the switch performs opening operation, the opening control loop is closed and conducted, the coil of the opening relay in the opening control loop is powered, the normally open contact of the opening relay connecting the power supply and the second wiring terminal of the motor in the motor loop is closed, and the motor rotates in the opening direction; when the switch is opened to the position, the auxiliary contact of the switch outputs an opening-to-position confirmation signal, and the trigger part of the motor spindle triggers the opening travel switch to switch the switch state, and the opening-to-position confirmation signal is output again, and the double confirmation of the one-key sequence control is completed.

[0008] The beneficial effects are that: the position signal of the switch is obtained by using two different criteria of travel switch and switch auxiliary switch, which meets the requirement of the State Grid Corporation of China that the position state confirmation of the switch in the double confirmation anti-misoperation logic should at least contain the main and auxiliary double criteria of different sources or different principles, and the method for double confirmation of the position of the switch by the travel switch and the switch auxiliary switch compared with the existing technology using the attitude sensor, the process of confirming the position of the switch does not need data conversion, so it is not necessary to increase the receiving device (the receiving device receiving the attitude sensor data and sending the data to the one-key sequence control background control system after conversion), thereby saving the cost of double confirmation of the position of the switch. And because the application is based on the method of double confirmation of the travel switch, the position state of the travel switch is closely related to the position state of the switch, that is, the position of the switch is corresponding to the position of the travel switch, and the method of confirming the position of the switch based on the travel switch does not need data conversion, and only the position signal is sent by the travel switch contact, so the application based on the method of double confirmation of the travel switch ensures the reliability of the received position signal of the switch.

[0009] Further, the normally closed contact of the closing travel switch is further connected in series on the closing control loop, and the normally closed contact of the opening travel switch is further connected in series on the opening control loop; when the switch is closed to the position, the trigger part of the motor spindle triggers the closing travel switch to switch the switch state, and the closing control loop is disconnected; when the switch is opened to the position, the trigger part of the motor spindle triggers the opening travel switch to switch the switch state, and the opening control loop is disconnected.

[0010] The normally closed contact of the closing stroke switch and the normally closed contact of the opening stroke switch are connected in the closing control circuit and the opening control circuit respectively, so that when the knife switch is closed to the position, the closing control circuit can be disconnected by the state conversion of the closing stroke switch, and when the knife switch is opened to the position, the opening control circuit can be disconnected by the state conversion of the opening stroke switch.

[0011] Further, the normally closed contact of the opening relay and the normally closed contact of the closing relay are connected in series in the closing control circuit.

[0012] The normally closed contact of the opening relay and the normally closed contact of the closing relay are connected in the closing control circuit and the opening control circuit respectively, based on the closing of the closing relay switch and the opening of the opening relay switch when the knife switch is closed, so that when the knife switch is closed, the normally closed contact of the opening relay is closed and the coil of the closing relay is powered, and the closing control circuit is turned on, and because the closing relay switch is in the closed state, the normally closed contact of the closing relay in the opening control circuit is disconnected, and the opening control circuit is disconnected, based on the setting of the closing control switch and the opening control switch in the control circuit, when the closing relay switch and the opening relay switch are turned on at the same time, the normally closed contact of the opening relay and the normally closed contact of the closing relay are disconnected at the same time, so that the closing control circuit and the opening control circuit are disconnected, and the situation that the knife switch control circuit controls the closing and opening of the knife switch at the same time is avoided.

[0013] Further, the closing stroke switch and the opening stroke switch are both double-point stroke switches, the first pair of contacts of the closing stroke switch is connected in series in the closing control circuit, the second pair of contacts of the closing stroke switch is connected in series in the knife switch closing and opening position double confirmation circuit, the first pair of contacts of the opening stroke switch is connected in series in the opening control circuit, and the second pair of contacts of the opening stroke switch is connected in series in the knife switch closing and opening position double confirmation circuit; the knife switch closing and opening position double confirmation circuit is used to output a closing-to-position confirmation signal when the knife switch is closed to the position, and output an opening-to-position confirmation signal when the knife switch is opened to the position.

[0014] By setting the stroke switch as a double-point stroke switch, and one pair of contacts being used for the knife switch mechanism control circuit and the other pair of contacts being used for providing the knife switch closing and opening position signal, that is, forming a control circuit and a signal transmission circuit, two independent circuits can be controlled, so that the signals of the two circuits do not affect each other, and the reliability of the knife switch position signal received by the one-key sequence control system is further improved.

[0015] Further, the second pair of contacts is a normally open contact.

[0016] The first contact point is used for controlling the on-off of the control circuit of the knife switch, and the first contact point is set as a normally open contact point, so that when the knife switch is in action, the first contact point is disconnected to realize the disconnection of the control circuit of the knife switch; the second contact point is an auxiliary signal contact point used for transmitting the position signal of the knife switch, and when the knife switch is in action, the second contact point is closed to realize the transmission of the position signal of the knife switch to a key sequence control system, that is, the process of signal transmission is only carried out when the knife switch is in action, thereby improving the accuracy of the received signal corresponding to the actual position of the knife switch, that is, the reliability of the received position signal of the knife switch.

[0017] To solve the above technical problems, the application further provides a knife switch circuit, which comprises a knife switch control circuit and a knife switch motor circuit, the knife switch control circuit comprises a closing control circuit and an opening control circuit, the coil of a closing relay is connected in series in the closing control circuit, and the coil of an opening relay is connected in series in the opening control circuit; the knife switch motor circuit comprises a knife switch motor used for driving the action of the knife switch to realize the closing and opening of the knife switch, a first connection terminal of the knife switch motor is connected with a normally open contact point of the closing relay and forms a closing circuit of the knife switch motor, a second connection terminal of the knife switch motor is connected with a normally open contact point of the opening relay and forms an opening circuit of the knife switch motor, and the knife switch circuit further comprises a knife switch closing and opening position double confirmation circuit, the knife switch closing and opening position double confirmation circuit comprises a knife switch closing position confirmation output end and a knife switch opening position confirmation output end; the normally open contact point of the knife switch and a closing stroke switch contact point are connected in parallel and then connected in series between the knife switch closing position confirmation output end; the normally closed contact point of the knife switch and an opening stroke switch contact point are connected in parallel and then connected in series between the knife switch opening position confirmation output end.

[0018] The knife switch closing and opening position double confirmation circuit is used for outputting a closing position confirmation signal by the normally open contact point of the knife switch when the knife switch is closed to position, simultaneously triggering the closing stroke switch of the trigger part of the motor main shaft to switch the state of the switch and outputting the closing position confirmation signal again to complete the double confirmation of the key sequence control, and outputting an opening position confirmation signal by the auxiliary contact point of the knife switch when the knife switch is opened to position, simultaneously triggering the opening stroke switch of the trigger part of the motor main shaft to switch the state of the switch and outputting the opening position confirmation signal again to complete the double confirmation of the key sequence control.

[0019] The beneficial effects are that: by adopting two different criteria of the travel switch and the knife gap auxiliary switch, the knife gap position signal is obtained, the requirements of the state confirmation of the knife gap in the double confirmation error prevention logic of the State Grid Corporation of China are met, the position state of the knife gap should at least contain the main and auxiliary double criteria of different sources or different principles, and compared with the existing technology using the posture sensor, the process of confirming the position of the knife gap of the application does not require data conversion, so it does not need to increase the receiving device (the receiving device of the posture sensor data, and the data is converted and then sent to the one-key sequence control background control system), thereby saving the cost of double confirmation of the knife gap position. And because the application is based on the double confirmation method of the travel switch, the position state of the travel switch is closely related to the position state of the knife gap, that is, the position of the knife gap is corresponding to the position of the travel switch, and the way of confirming the position of the knife gap based on the travel switch does not require data conversion, only the position signal is sent through the auxiliary signal contact of the travel switch, and the information of the position of the knife gap is determined, so the double confirmation method based on the travel switch of the application ensures the reliability of the received knife gap position signal.

[0020] Further, the normally closed contact of the closing travel switch is further connected in series on the closing control circuit, and the normally closed contact of the opening travel switch is further connected in series on the opening control circuit; when the knife gap is closed in place, the trigger part of the motor spindle triggers the closing travel switch to switch the state, and the closing control circuit is disconnected, when the knife gap is opened in place, the trigger part of the motor spindle triggers the opening travel switch to switch the state, and the opening control circuit is disconnected.

[0021] The closing travel switch and the opening travel switch are respectively connected in the closing control circuit and the opening control circuit, so that when the knife gap is closed in place, the closing control circuit can be disconnected through the state switching of the closing travel switch, and when the knife gap is opened in place, the opening control circuit can be disconnected through the state switching of the opening travel switch.

[0022] Further, the normally closed contact of the closing travel switch is further connected in series on the closing control circuit, and the normally closed contact of the opening travel switch is further connected in series on the opening control circuit; when the knife gap is closed in place, the trigger part of the motor spindle triggers the closing travel switch to switch the state, and the closing control circuit is disconnected, when the knife gap is opened in place, the trigger part of the motor spindle triggers the opening travel switch to switch the state, and the opening control circuit is disconnected.

[0023] The closing relay normally closed contact and the closing relay normally closed contact are arranged on the closing control circuit and the opening control circuit respectively, based on the closing of the closing relay switch and the opening of the opening relay switch when the knife switch closing action, so the closing relay normally closed contact is closed and the closing relay coil is powered when the knife switch closing action, and the closing control circuit is conducted, and because the closing relay switch is in the closed state, the closing relay normally closed contact in the opening control circuit is opened at this time, and the opening control circuit is opened, based on the arrangement of the closing control switch and the opening control switch in the control circuit, when the closing relay switch and the opening relay switch are conducted at the same time, the closing relay normally closed contact and the opening relay normally closed contact are opened at the same time, so that the closing control circuit and the opening control circuit are both opened, and the situation that the knife switch control circuit controls the closing and opening of the knife switch at the same time is avoided.

[0024] Further, the closing travel switch and the opening travel switch are both double contact travel switches, the first pair of contacts of the closing travel switch is arranged in series on the closing control circuit, and the second pair of contacts of the closing travel switch is arranged in series between the knife switch closing position confirmation output ends, the first pair of contacts of the opening travel switch is arranged in series on the opening control circuit, and the second pair of contacts of the opening travel switch is arranged in series between the knife switch opening position confirmation output ends.

[0025] By arranging the travel switch as a double contact travel switch, and arranging one pair of contacts for the knife switch mechanism control circuit and the other pair of contacts for providing the knife switch closing and opening position signal, that is, forming a control circuit and a signal transmission circuit, two independent circuits can be controlled, the signals of the two circuits do not affect each other, and the reliability of the knife switch position signal received by the one-key sequence control system is further improved.

[0026] Further, the second pair of contacts is a normally open contact.

[0027] The first pair of contacts is used for controlling the on-off of the knife switch control circuit, after the first pair of contacts is arranged as a normally open contact, the first pair of contacts is opened when the knife switch is in place, so as to realize the opening of the knife switch control circuit; the second pair of contacts is an auxiliary signal contact for transmitting the knife switch position signal, and the second pair of contacts is closed when the knife switch is in place, so as to realize the transmission of the knife switch position signal to the one-key sequence control system, that is, the signal transmission process is only carried out when the knife switch is in place, and the accuracy of the received signal corresponding to the actual position of the knife switch is improved, that is, the reliability of the received knife switch position signal is improved. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a schematic diagram of the knife switch motor and the control circuit of the present application;

[0029] Figure 2 is a schematic diagram of the knife switch closing and opening position signal of the present application. DETAILED DESCRIPTION

[0030] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0031] Example of a method for double confirmation of the position of the switch in one-button sequential control:

[0032] This embodiment is illustrated by... Figure 1 and Figure 2 The method steps for implementing dual confirmation of the knife switch position in one-button sequential control using a knife switch circuit are described in this embodiment. The knife switch circuit includes a knife switch control circuit, a knife switch motor circuit, and a knife switch opening / closing position dual confirmation circuit. The knife switch control circuit and the knife switch motor circuit are as follows: Figure 1 As shown, the dual confirmation circuit for the open / close position of the disconnector is as follows: Figure 2 As shown. Figure 1 In the circuit, the disconnector control circuit includes a closing control circuit and a opening control circuit connected in parallel between the positive and negative terminals of the control power supply. The coil of the closing relay KE is connected in series in the closing control circuit, and the coil of the opening relay KA is connected in series in the opening control circuit. The normally closed contact of the opening relay KA and the normally closed contact of the limit switch SL1 are also connected in series in the closing control circuit, and the normally closed contact of the closing relay KB and the normally closed contact of the limit switch SL2 are also connected in series in the opening control circuit. The disconnector motor circuit includes a motor M, and the normally open contact of the closing relay KE (i.e.,...). Figure 1 The normally open contacts of the intermediate switch terminals (KE switches with terminals 1-2, 3-4, and 5-6) and the trip relay KA (i.e., Figure 1 The KA switch has terminals 1-2, 3-4, and 5-6. One end of the KE switch with terminal 1-2 is also used to connect to the positive terminal of the motor power supply, and the other end is connected to the first terminal of the motor (which can be the motor rotor terminal or the motor stator terminal). The second terminal of the motor is connected to one end of the KE switch with terminal 5-6, and the other end of the KE switch with terminal 5-6 is connected to the negative terminal of the motor power supply. One end of the KA switch with terminal 1-2 is also used to connect to the positive terminal of the motor power supply, and the other end is connected to the second terminal of the motor. The first terminal of the motor is connected to one end of the KA switch with terminal 5-6, and the other end of the KA switch with terminal 5-6 is connected to the negative terminal of the motor power supply. Figure 2 In this circuit, the dual confirmation circuit for the opening and closing positions of the disconnector includes a disconnector closing position confirmation output terminal and a disconnector opening position confirmation output terminal; the normally open contact of the disconnector and the closing limit switch contact are connected in parallel and then connected in series between the disconnector closing position confirmation output terminals; the normally closed contact of the disconnector and the opening limit switch contact are connected in parallel and then connected in series between the disconnector opening position confirmation output terminals.

[0033] based on Figure 1 and Figure 2When receiving a one-key sequence control operation instruction, the knife switch corresponding to the one-key sequence control operation performs a closing or opening operation according to the corresponding instruction; if the knife switch performs the closing operation, the closing control loop is closed and conducted, the coil of the closing relay KE in the closing control loop is powered, the normally open contact of the closing relay KE connecting the power supply and the first wiring terminal of the motor in the motor loop is closed, and the motor rotates in the closing direction; when the knife switch is closed to the position, the auxiliary contact of the knife switch outputs a closing-to-position confirmation signal, and the trigger part (for example, a cam of the motor spindle) of the motor spindle triggers the closing travel switch to switch the switch state and output the closing-to-position confirmation signal again, so that the one-key sequence control double confirmation is completed; if the knife switch performs the opening operation, the opening control loop is closed and conducted, the coil of the opening relay KA in the opening control loop is powered, the normally open contact of the opening relay KA connecting the power supply and the second wiring terminal of the motor in the motor loop is closed, and the motor rotates in the opening direction; when the knife switch is opened to the position, the auxiliary contact of the knife switch outputs an opening-to-position confirmation signal, and the trigger part of the motor spindle triggers the opening travel switch to switch the switch state and output the opening-to-position confirmation signal again, so that the one-key sequence control double confirmation is completed.

[0034] By using the travel switch and the auxiliary switch of the knife switch as two different criteria to obtain the position signal of the knife switch, the requirement of the State Grid Corporation of China that the position state confirmation of the knife switch in the double-confirmation anti-misoperation logic should at least include the main and auxiliary double criteria of different sources or different principles is met, and compared with the existing technology using the attitude sensor, the process of confirming the position of the knife switch of the embodiment does not need data conversion, so that a receiving device (a receiving device receiving the data of the attitude sensor and sending the data to the one-key sequence control background control system after conversion) is not needed, thereby saving the cost of double confirmation of the position of the knife switch. Moreover, the position state of the travel switch is closely related to the position state of the knife switch, that is, the position of the knife switch is corresponding to the position of the travel switch, and the method of confirming the position of the knife switch based on the travel switch does not need data conversion, but only needs to send the position signal through the auxiliary signal contact of the travel switch to determine the information of the position of the knife switch, so that the reliability of the received position signal of the knife switch is ensured by the method of double confirmation based on the travel switch.

[0035] And the normally closed contact of the closing stroke switch and the normally closed contact of the opening stroke switch are connected in the closing control loop and the opening control loop respectively, so that when the knife switch is closed to the position, the closing control loop can be disconnected through the state conversion of the closing stroke switch, and when the knife switch is opened to the position, the opening control loop can be disconnected through the state conversion of the opening stroke switch. The normally closed contact of the opening relay and the normally closed contact of the closing relay are arranged on the closing control loop and the opening control loop respectively, and based on the fact that the closing relay switch is closed and the opening relay switch is opened when the knife switch is closed, the normally closed contact of the opening relay is closed and the coil of the closing relay is powered when the knife switch is closed, so that the closing control loop is turned on, and because the closing relay switch is in the closed state, the normally closed contact of the closing relay in the opening control loop is disconnected, so that the opening control loop is disconnected. Based on the fact that the closing control switch and the opening control switch are arranged in the control loop, when the closing relay switch and the opening relay switch are turned on at the same time, the normally closed contact of the opening relay and the normally closed contact of the closing relay are disconnected at the same time, so that the closing control loop and the opening control loop are disconnected, thereby avoiding the situation that the knife switch control loop controls the closing and opening of the knife switch at the same time.

[0036] Among them, the knife switch auxiliary switch and the stroke switch in the knife switch circuit are two ways to realize double confirmation of the position of the knife switch. Specifically, the stroke switches are SL1 closing stroke switch and SL2 opening stroke switch, and both of them are double contact stroke switches. One pair of contacts is used to realize the connection or disconnection of the control loop, and the other pair of contacts is used to realize the transmission of the position signal of the knife switch. By setting the stroke switch as a double contact stroke switch, one pair of contacts is used for the control loop of the knife switch mechanism, and the other pair of contacts is used to provide the position signal of the closing and opening of the knife switch, that is, a control loop and a signal transmission loop are formed, which can control two independent circuits, so that the signals of the two loops do not affect each other, and the reliability of the position signal of the knife switch received by the one-key sequence control system is further improved. Figure 1 The first pair of contacts (NC1-COM1-NO1) of the stroke switch SL1 is used to control the connection or disconnection of the closing control loop, the first pair of contacts (NC1-COM1-NO1) of the stroke switch SL2 is used to control the connection or disconnection of the opening control loop, and the first pair of contacts of the stroke switch SL1 and the first pair of contacts of the stroke switch SL2 are normally closed contacts. The working principle of the first pair of contacts of the stroke switch SL1 and the first pair of contacts of the stroke switch SL2 in this embodiment is that when the knife switch mechanism is closed to the position, the first pair of contacts of the stroke switch SL1 changes from the normally closed state to the disconnected state; when the knife switch mechanism is opened to the position, the first pair of contacts of the stroke switch SL2 changes from the normally closed state to the disconnected state. The other pair of contacts (i.e. the second pair of contacts) of the two stroke switches are used to provide the position signal of the closing and opening of the knife switch, such as Figure 2As shown, the second contact points of the travel switches SL1 and SL2 in the embodiment are normally open contact points (the first contact points are used to control the on-off of the control circuit of the knife switch, after the first contact points are set as normally open contact points, when the knife switch is in the position of action, the first contact points are disconnected to realize the disconnection of the control circuit of the knife switch; the second contact points are auxiliary signal contact points for transmitting the position signal of the knife switch, when the knife switch is in the position of action, the second contact points are closed to realize the transmission of the position signal of the knife switch to a key sequence control system, that is, only in the process of signal transmission when the knife switch is in the position of action, the accuracy of the received signal corresponding to the actual position of the knife switch is improved, that is, the reliability of the received position signal of the knife switch is improved, and as other embodiments, both can be normally closed contact points, or one is normally open contact point and the other is normally closed contact point), the working principle of the second contact points of the travel switches SL1 and SL2 in the embodiment is that when the knife switch mechanism is in the position of closing, the second contact point of the travel switch SL1 is changed from normally open state to closed state, and sends a closing position signal of the knife switch to a key sequence control system; when the knife switch mechanism is in the position of opening, the second contact point of the travel switch SL2 is changed from normally open state to closed state, and sends an opening position signal of the knife switch to the key sequence control system. The two auxiliary switches of the knife switch are respectively used to provide the opening position signal of the knife switch and the closing position signal of the knife switch, as shown in Figure 2 As shown, the normally open contact point of the auxiliary switch of the knife switch in the embodiment sends a closing position signal of the knife switch, and the normally closed contact point of the auxiliary switch of the knife switch sends an opening position signal of the knife switch, and the working principle of the auxiliary switch is that when the knife switch mechanism is in the position of closing, the normally open contact point is closed and the normally closed contact point is disconnected, and the auxiliary switch sends a closing position signal of the knife switch to a key sequence control system; when the knife switch mechanism is in the position of opening, the normally open contact point is disconnected and the normally closed contact point is closed, and the auxiliary switch sends an opening position signal of the knife switch to the key sequence control system.

[0037] Based on the working principle of the travel switch and the auxiliary switch in the embodiment, the position of the knife switch can be determined by two different criteria by acquiring the on-off position signals of the auxiliary switch and the travel switch, that is, by acquiring the on-off position signals of the auxiliary switch and the travel switch, the requirement of the State Grid Corporation of China that the position state confirmation of the knife switch in the double-confirmation anti-misoperation logic should at least contain the main and auxiliary double criteria of different sources or different principles can be met, so that the double confirmation of the position of the knife switch is realized by acquiring the on-off position signals of the auxiliary switch and the travel switch. The correspondence between the acquired signals and the position of the knife switch in the embodiment is as follows: when the knife switch closing signal of the travel switch SL1 (that is, the second pair of contacts of the travel switch SL1 is in a closed state) is received, and the knife switch closing signal of the auxiliary switch (that is, the normally open contact of the auxiliary switch is closed and the normally closed contact is disconnected) is received, the position of the knife switch is in the closing position; when the knife switch opening signal of the travel switch SL2 (that is, the second pair of contacts of the travel switch SL2 is in a closed state) is received, and the knife switch opening signal of the auxiliary switch (that is, the normally open contact of the auxiliary switch is disconnected and the normally closed contact is closed) is received, the position of the knife switch is in the opening position.

[0038] In the embodiment, the double-contact travel switch is adopted, and the position signal of the second pair of contacts of the travel switch of the knife switch mechanism is acquired, which is combined with the normally open contact and the normally closed contact of the auxiliary switch of the knife switch, so that the requirement of the State Grid Corporation of China that the position state confirmation of the knife switch in the double-confirmation anti-misoperation logic should at least contain the main and auxiliary double criteria of different sources or different principles is met, and the double confirmation of the position of the knife switch in the one-key sequence control system of the substation is realized.

[0039] And the "double confirmation" mode in the embodiment is a "double confirmation" mode based on the travel switch. The method for determining the position of the knife switch by the travel switch in the embodiment does not need to perform a data conversion process, so the reliability is guaranteed. That is, the travel switch with double contacts is adopted in the embodiment, one set of contacts is used for the knife switch structure control loop, and the other set of contacts is used to provide the knife switch opening and closing position signal. Compared with the prior art that uses the posture sensor and the receiving device to provide the knife switch opening and closing position signal, the reliability is greatly improved. And the method for performing double confirmation of the position of the knife switch by the travel switch and the auxiliary switch in the embodiment does not need to add new equipment in the original knife switch mechanism, and the double confirmation of the position of the knife switch is completed. That is, the travel switch with double contacts is used in the knife switch mechanism instead of the original single-node travel switch. Without changing the control principle of the knife switch mechanism and increasing the number of components in the knife switch mechanism, the control requirement of the knife switch mechanism and the requirement of uploading the opening and closing position state of the knife switch are realized. Therefore, compared with the prior art that needs to add new equipment to realize the double confirmation of the position of the knife switch, the cost of the double confirmation of the position of the knife switch is reduced. And in the embodiment, only the travel switch with single contacts in the prior art is changed to the travel switch with double contacts. Therefore, the structure for realizing the double confirmation of the knife switch in the embodiment reduces the structural complexity compared with the structure of adding new equipment in the prior art, and the difficulty of later maintenance is also reduced accordingly.

[0040] The knife switch circuit embodiment includes a knife switch control circuit, a knife switch motor circuit, and a knife switch opening and closing position double confirmation circuit.

[0041] The knife switch circuit embodiment includes a knife switch control circuit, a knife switch motor circuit, and a knife switch opening and closing position double confirmation circuit. Figure 1 Figure 2 Figure 1 Among them, the knife switch control circuit includes the closing control loop and the opening control loop which are connected in parallel between the positive and negative poles of the control power supply. The coil of the closing relay KE is connected in series in the closing control loop, and the coil of the opening relay KA is connected in series in the opening control loop. The normally closed contact of the opening relay KA and the normally closed contact of the travel switch SL1 are further connected in series on the closing control loop, and the normally closed contact of the closing relay KB and the normally closed contact of the travel switch SL2 are further connected in series on the opening control loop. Figure 1 Figure 1 ​​​The switch terminal of the KA switch is 1-2, 3-4 and 5-6; one end of the switch terminal of the KE switch is connected with the positive pole of the motor power supply, and the other end is connected with the first wiring terminal of the motor; the second wiring terminal of the motor is connected with one end of the switch terminal of the KE switch, and the other end of the switch terminal of the KE switch is connected with the negative pole of the motor power supply; one end of the switch terminal of the KA switch is connected with the positive pole of the motor power supply, and the other end is connected with the second wiring terminal of the motor; and the first wiring terminal of the motor is connected with one end of the switch terminal of the KA switch, and the other end of the switch terminal of the KA switch is connected with the negative pole of the motor power supply. Figure 2 In the embodiment, the double confirmation circuit of the on-off position of the knife switch comprises a confirmation output end of the on position of the knife switch and a confirmation output end of the off position of the knife switch; the normally open contact of the knife switch and the on-off stroke switch contact are connected in parallel and then connected in series between the confirmation output ends of the on position of the knife switch; and the normally closed contact of the knife switch and the on-off stroke switch contact are connected in parallel and then connected in series between the confirmation output ends of the off position of the knife switch.

[0042] The embodiment realizes the method steps of the double confirmation of the position of the knife switch in the one-key sequence control through the knife switch circuit, and the specific method of the double confirmation of the position of the knife switch in the one-key sequence control is described in detail in the method embodiment of the double confirmation of the position of the knife switch in the one-key sequence control, which will not be repeated here.

[0043] The above description is only the preferred embodiment of the present application, and does not limit the present application, and the patent protection scope of the present application is subject to the claims, and any equivalent structural changes made according to the content of the description and drawings of the present application should also be included in the protection scope of the present application.

Claims

1. A method for one-button sequential control with dual confirmation of the position of a knife switch, characterized in that, When a one-key sequential control operation command is received, the corresponding disconnector performs a closing or opening operation according to the command. If the disconnector performs a closing operation, the closing control circuit is closed and energized, the coil of the closing relay in the closing control circuit is energized, the normally open contact of the closing relay in the motor circuit that connects the power supply and the first terminal of the motor closes, and the motor rotates in the closing direction. When the disconnector is closed, the disconnector auxiliary contact outputs a closing confirmation signal, and at the same time, the trigger part of the motor spindle triggers the closing limit switch to change the state, and outputs a closing confirmation signal again, completing the one-key sequential control double confirmation. If the disconnector performs an opening operation, the opening control circuit closes and conducts, the coil of the opening relay in the opening control circuit is energized, the normally open contact of the opening relay connected to the power supply and the second terminal of the motor in the motor circuit closes, and the motor rotates in the opening direction; when the disconnector is fully opened, the disconnector auxiliary contact outputs an opening confirmation signal, and at the same time the triggering part of the motor spindle triggers the opening limit switch to change the state, and outputs the opening confirmation signal again, completing one-key sequential control double confirmation.

2. The method for double confirmation of the position of the switch in one-button sequential control according to claim 1, characterized in that, The closing control circuit is also equipped with a normally closed contact of a closing limit switch, and the opening control circuit is also equipped with a normally closed contact of an opening limit switch. When the disconnector is closed, the triggering part of the motor spindle triggers the closing limit switch to change state, and the closing control circuit is disconnected. When the disconnector is opened, the triggering part of the motor spindle triggers the opening limit switch to change state, and the opening control circuit is disconnected.

3. The method for double confirmation of the position of the switch in one-button sequential control according to claim 1, characterized in that, The closing control circuit is also equipped with a normally closed contact of a closing relay, and the closing control circuit is also equipped with a normally closed contact of a closing relay.

4. The method for double confirmation of the position of the switch in one-button sequential control according to claim 2, characterized in that, Both the closing limit switch and the opening limit switch are double-contact limit switches. The first contact of the closing limit switch is connected in series in the closing control circuit, and the second contact of the closing limit switch is connected in series in the double confirmation circuit for the opening and closing positions of the disconnector. The first contact of the opening limit switch is connected in series in the opening control circuit, and the second contact of the opening limit switch is connected in series in the double confirmation circuit for the opening and closing positions of the disconnector. The double confirmation circuit for the opening and closing positions of the disconnector is used to output a closing confirmation signal after the disconnector is closed and an opening confirmation signal after the disconnector is opened.

5. The method for double confirmation of the position of the switch in one-button sequential control according to claim 4, characterized in that, The second connection point is a normally open connection.

6. A disconnect switch circuit, comprising a disconnect switch control circuit and a disconnect switch motor circuit, wherein the disconnect switch control circuit includes a closing control circuit and a opening control circuit, wherein a coil of a closing relay is connected in series in the closing control circuit, and a coil of an opening relay is connected in series in the opening control circuit; the disconnect switch motor circuit includes a disconnect switch motor for driving the disconnect switch to achieve closing and opening, wherein a first terminal of the disconnect switch motor is connected to a normally open contact of a closing relay to form a closing circuit for the disconnect switch motor, and a second terminal of the disconnect switch motor is connected to a normally open contact of an opening relay to form an opening circuit for the disconnect switch motor, characterized in that, It also includes a dual confirmation circuit for the opening and closing positions of the disconnector, which includes a disconnector closing position confirmation output terminal and a disconnector opening position confirmation output terminal; the normally open contact of the disconnector and the closing limit switch contact are connected in parallel and then connected in series between the disconnector closing position confirmation output terminals; the normally closed contact of the disconnector and the opening limit switch contact are connected in parallel and then connected in series between the disconnector opening position confirmation output terminals. The dual confirmation circuit for the opening and closing positions of the disconnector is used so that when the disconnector is closed, the normally open contact of the disconnector outputs a closing confirmation signal, and at the same time, the trigger part of the motor spindle triggers the closing limit switch to change state, and outputs the closing confirmation signal again, completing the one-key sequential control dual confirmation. When the disconnector is open, the auxiliary contact of the disconnector outputs an opening confirmation signal, and at the same time, the trigger part of the motor spindle triggers the opening limit switch to change state, and outputs the opening confirmation signal again, completing the one-key sequential control dual confirmation.

7. The knife switch circuit according to claim 6, characterized in that, The closing control circuit is also equipped with a normally closed contact of a closing limit switch, and the opening control circuit is also equipped with a normally closed contact of an opening limit switch. When the disconnector is closed, the triggering part of the motor spindle triggers the closing limit switch to change state, and the closing control circuit is disconnected. When the disconnector is opened, the triggering part of the motor spindle triggers the opening limit switch to change state, and the opening control circuit is disconnected.

8. The knife switch circuit according to claim 6, characterized in that, The closing control circuit is also equipped with a normally closed contact of a closing relay, and the closing control circuit is also equipped with a normally closed contact of a closing relay.

9. The knife switch circuit according to claim 7, characterized in that, Both the closing limit switch and the opening limit switch are double-contact limit switches. The first contact point of the closing limit switch is connected in series in the closing control circuit, and the second contact point of the closing limit switch is connected in series between the closing position confirmation output terminals of the disconnector. The first contact point of the opening limit switch is connected in series in the opening control circuit, and the second contact point of the opening limit switch is connected in series between the opening position confirmation output terminals of the disconnector.

10. The knife switch circuit according to claim 9, characterized in that, The second connection point is a normally open connection.

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