RU199451U1 - Disconnector control device - Google Patents

Abstract

The utility model relates to electrical engineering, in particular to control devices for electrical disconnectors equipped with electric drives. The technical result consists in providing the ability to control the disconnector and grounding knives in the absence of stationary power supply with alternating current of low voltage. It is achieved by the fact that the control device of the disconnector with a linear drive is equipped with an executive unit fixed on the power transmission line support. In the case of the executive unit there is a programmable relay that provides the control algorithm for the disconnector drive and is directly connected to the DC power supply located in the executive unit. The current source, in turn, is electrically connected to the linear electric drives, as well as to the contacts of the disconnector position and earthing knives, located on an additional stand and mounting strips fixed on the base of the disconnector frame. 4 ill.

Description

The proposed utility model relates to electrical engineering and can be used in the field of control of electrical disconnectors equipped with electric drives.

Disconnectors of various types are known from the prior art, which are mechanically controlled by means of metal rods. In different versions of disconnectors, the number of rods can be from one to three 6-8 meters long. To prevent erroneous or spontaneous activation, a mechanical interlock is provided. Disconnectors, which are mechanically controlled, are used on power transmission lines with a voltage of 6-10 kV. For example, a horizontal-rotary disconnector containing a frame with insulating columns on which the contact blades of the main current-carrying system are installed (RF Useful Model No. 29403 IPC H01H 31/20, publ. 10.05.2003). Also known is a linear swing-type disconnector (RF Utility Model No. 130450, IPC H01H 31/00, publ. 20.07.2013), equipped with a manual mechanical drive.

In the disconnector (utility model No. 187271, IPC H01H31 / 20 publ. 28.02.2019), linear electric drives are used as a drive for the disconnector itself and grounding knives (ZN). Such electric drives can be installed on existing 6-10 kV disconnectors, replacing manual control of a mechanical drive with an electric one. But this disconnector does not have a drive control facility, and the existing disconnector drive control devices are not suitable for controlling electric drives, because A common feature of known drives is their use in closed or open switchgears (ZRU), which are characterized by the presence of a low voltage AC power source (up to 1 kV), which determines their local use.

The use of electric motor drives for disconnectors on 6-10 kV power lines is currently impossible, since for known electric motor drives there is no AC power supply of low voltage (up to 1000 V), due to the remoteness of stationary power sources (up to several hundred kilometers).

The closest solution in technical essence is a disconnector control device (utility model (SESH), according to patent No. 125765, IPC H01H3 / 26, publ.10.03.2013), containing a power source, a control switch, drive block contacts, coils of starters and shutdown, a group of contacts for supplying voltage to the electric motor, in which the control switch is made three-position, its two contacts are connected through the drive block contacts to the coils of the on and off starters, and the third contact of the control switch is connected in parallel with the first two and through two contacts is also connected to the unit - the drive contacts.

The disadvantage of this control device is that it can only operate in the presence of low voltage alternating current (up to 1000 V), and is stationary.

The task of the proposed utility model is to create a device that provides the ability to control disconnectors installed on power lines located at a distance remote from power sources.

The task is solved due to the fact that the disconnector control device is equipped with an executive unit, in the case of which there is a programmable relay providing control of the disconnector drive, directly connected to the DC power supply located in the case of the executive unit, which, in turn, is electrically connected to the linear by electric drives, and is also connected to the contacts of the disconnector position and earthing knives, located on an additional rack and mounting plates fixed on the base of the disconnector frame.

The technical result from the use of the utility model is to provide the ability to control the disconnector and grounding knives in the absence of stationary power supply with low voltage alternating current.

Figure 1 shows a diagram of a disconnector with a control device - front view;

Figure 2 shows a diagram of a disconnector - side view;

Figure 3 shows a layout diagram of the executive unit;

Figure 4 shows the front panel of the body of the executive unit.

On the base of the frame 1 of the disconnector, an additional post 2 is fixed, on which the “on” position sensor 3 of the disconnector (P) and the “off” position sensor 4 of the disconnector (P) are fixed;

a reversible electric motor drive of the disconnector 5, on the body of which a magnet 6 is located (Fig. 1). On the base of frame 1 there are mounted: mounting plate 7, on which the “on” position sensor 8 grounding knives (ZN) and the mounting plate 9, on which the “off” position sensor 10 grounding knives (ZN) are fixed. On the shaft 11 of the grounding knives, controlled by an electric motor drive 12, a magnet 13 is fixed (Fig. 2).

The executive unit 14 is located on a power transmission line support (not shown in the figure).

The executive block 14 contains, located in the block housing:

programmable relay 15 (figure 3), disconnector button (P) "turn on" 16, disconnector button (P) "turn off" 17; lamp "off" 18 of the disconnector (P); lamp "position not determined" 19 disconnector (P); the "on" lamp of the disconnector (R) 20; button "turn on" 21 earthing knives (ZN); the "disable" button 22 (ZN); lamp "disabled" 23 grounding knives (ZN); lamp "position not determined" 24 grounding knives (ZN); lamp "on" 25 grounding knives (ZN) (figure 3); and the power source is a storage battery 26. (Fig. 3). The cable from the sensors and actuators mounted on the disconnector (not shown in the figure) ends with a plug of the plug connector 27. The actuator is connected to the electric motor drives and position sensors of the disconnector by a socket 28 of the plug connector.

The control device for a disconnector installed on a power line located at a distance distant from the power source works as follows.

In the initial state, the executive unit 14, with a built-in power source (battery) 26, is connected to the cable of the disconnector drives by means of a plug connector (plug 27 and socket 28). If it is necessary to switch quickly, the personnel arriving at the installation site of the disconnector, by acting on the control buttons of the disconnector knives or grounding knives, makes the necessary switching on or off. The control device, when switched on, determines the current position of the disconnector and grounding knives according to the state of position sensors 3, 4, 8, 10. Possible positions of the disconnector and grounding knives and permitted switching are shown in the table.

The required command is given by buttons 16, 17, 21, 22 of the executive unit 14 to move the disconnector or grounding blades to the on or off position. Programmable relay 15 provides reception of commands for switching from buttons 16,17,21,22 and verification of the correctness of the requested switching (Fig. 3.4). When the switching command is disabled (see table) in the current position of the disconnector, no action is taken. When the command is enabled, the programmable relay turns on the corresponding actuator (5 or 12) for a fixed time required to ensure that the contacts move to the required position. When the corresponding position sensor (3,4,8,10) is triggered, the drive is switched off (stopped).

If, within a time guaranteed sufficient to move the disconnector knives or earthing knives, the sensor does not operate, confirming their transfer to the end position, then the corresponding drive stops, and the control unit indicates an error in switching the disconnector (lamp 19) or earthing knives (lamp 24). Lamps 18,19,20 indicate the position of the disconnector contacts, lamps 23,24,25 indicate the position of the contacts of the grounding blades (Fig. 4). For ease of use (for confident differentiation of control signals), the indicators are marked, respectively: position indicator in shutdown mode (lamp 18) - green; failure indicator (lamp 19) - yellow; indicator of the disconnector position in the on state (lamp 20) in red. The indicators of the position of the grounding knives (ZN) are similarly marked - disabled (lamp 23) - green, failure (lamp 24) - yellow; switched on (lamp 25) - red.

The disconnector control device, in possible specific situations, works as follows.

Example 1

The initial position is the disconnector is on, and the position of the earthing blades is off. The control unit is connected to a disconnector with earthing blades by means of a plug connector 27 and a socket 28. The power switch (not shown in the diagram) turns on the executive unit 14. After the automatic loading of software from the internal non-volatile memory of the programmable relay 15 (Fig. 3) and polling the state of the position sensors of the disconnector with grounding knives, the executive unit indicates the current position of the contacts: lamps 20 and 23 are lit, lamps 18, 19, 24, 25 are extinguished (Fig. 4). The control system is now ready to accept operator commands. The operator presses the button 17 "disconnect switch", the programmable relay receives the specified command to the corresponding discrete input (sensor 3), checks the received command for validity. The specified command is enabled (lamp 20). The programmable relay 15 supplies voltage to the reversible electric motor drive of the disconnector 5, the moving contacts of the disconnector start moving, the position sensor of the disconnector 3 ("on") opens. The programmable relay extinguishes the lamp of the disconnector 20 ("on"), and the lamp 19 "position not determined" of the disconnector, switches to the intermittent mode of action and turns on the program timer for the time required to move the contacts of the disconnector to the "off" position (lamp 18). When, during the timer operation, the contacts of the disconnector have moved to the “off” position (lamp 18), the disconnector sensor 4 “disconnected” is triggered, the program relay stops the reversing electric motor drive of the disconnector 5, extinguishes the lamp 19 (“position not determined”) of the disconnector and lights the lamp 18 ("Disabled") disconnector. The control system is ready to receive the next command, for example: “turn on the earthing blades” or “shut down”.

If during the operation of the timer the contacts of the disconnector did not move to the "off" position - the "off" position sensor of the disconnector 4 did not work, then the program relay stops the reversible electric motor drive 5 of the disconnector, switches the lamp 19 ("position not determined") of the disconnector to the permanent burning mode ... When the position of the disconnector contacts is not defined, all operations are prohibited. In this case,

the control unit is turned off and the plug connector is disconnected (plug 27 from socket 28 of the disconnector). The disconnector control becomes impossible (blocked) until the fault is clarified and eliminated.

Example 2.

Initial position - disconnector open, position of earthing blades - open. The control unit is connected to a disconnector with earthing blades by means of a plug connector: plug 27 and socket 28. The power switch (not shown in the diagram) turns on the executive unit 14. After automatic loading of software from the internal non-volatile memory of the programmable relay 15 and polling the state of the position sensors of the disconnector with grounding knives, the executive unit indicates the current position of the contacts: lamps 18 and 23 are on, lamps 19 , 20, 24, 25 are paid off. The control system is now ready to accept operator commands. The operator presses the button 21 "turn on the grounding knives", the programmable relay receives the specified command to the corresponding discrete input (sensor 10), checks the received command for validity. The specified command is enabled (lamp 23). The programmable relay supplies voltage to the reversible electric motor drive of the grounding knives 12, the movable contacts of the grounding knives start to move, the position sensor of the grounding knives 10 ("off") is opened (figure 2). The programmable relay extinguishes the lamp of grounding blades 20 ("off"), and the lamp of 24 grounding blades ("position not determined"), switches to intermittent mode and cocks the program timer for the time required to move the contacts of the grounding blades to the "on" position (lamp 25). When, during the timer operation, the contacts of the grounding knives have moved to the "on" position (lamp 25), the disconnector sensor 8 ("on") is triggered, the program relay stops the reversible electric motor drive of the grounding knives 12, extinguishes the lamp 24 ("position not determined") of the grounding knives and lights the lamp 25 ("on") grounding knives. The control system is ready to receive the next command, for example: "Disable earthing knives" or "Shut down".

Example 3

Initial position - disconnector open, position of earthing blades - open. By means of the plug connector: (plugs 27 and sockets 28) the control unit is connected to a disconnector with earthing blades. The power switch (not shown in the diagram) turns on the executive unit 14. After automatic loading of software from the internal non-volatile memory of the programmable relay 15 and polling the state of the position sensors of the disconnector with grounding knives, the executive unit indicates the current position of the contacts: lamps 18 and 23 are on, lamps 19 , 20, 24, 25 are paid off. The control system is now ready to accept operator commands. The operator presses the button 16 “open disconnector”, the programmable relay receives the specified command to the corresponding discrete input (sensor 4), checks the received command for validity. The specified command is enabled (lamp 18 is on). The programmable relay supplies voltage to the reversing electric motor drive of the disconnector 5, the movable contacts of the disconnector start moving, the position sensor of the disconnector 4 ("disconnected") opens. The programmable relay extinguishes the lamp 18 of the disconnector ("on"), and switches the lamp 19 ("position not determined") of the disconnector into intermittent mode and charges the program timer for the time required to move the contacts of the disconnector to the "on" position (lamp 20). When, during the timer operation, the contacts of the disconnector have moved to the "on" position (lamp 20), the disconnector sensor 3 ("on") is triggered, the program relay stops the reversing electric motor drive of the disconnector 5, extinguishes the lamp 19 ("position not determined") of the disconnector and lights lamp 20 ("on") of the disconnector. The control system is ready to receive the next command, for example: "open the isolator" or "shut down".

If during the timer operation the contacts of the disconnector did not move to the “on” position - the “on” position sensor of the disconnector (3) did not work, then the program relay stops the reversing electric motor drive (5) of the disconnector, switches the lamp 19 (“position not determined”) of the disconnector to the constant burning mode. When the position of the disconnector contacts is not defined, all operations are prohibited. In this case, the control unit is turned off and the plug connector is disconnected: the plug 27 comes out of contact with the socket 28 of the disconnector. The disconnector control becomes impossible (blocked) until the fault is clarified and eliminated.

Example 4

The initial position of the disconnector is off, the position of the earthing blades is on. The control unit is connected to a disconnector with earthing blades by means of a plug connector 27 and a socket 28. The power switch (not shown in the diagram) turns on the executive unit. After automatic loading of software from the internal non-volatile memory of the programmable relay 15 and polling the state of the position sensors of the disconnector with grounding knives, the executive unit indicates the current position of the contacts: lamps 18 and 25 are on, lamps 19, 20, 23, 24 are extinguished (Fig. 4) System control is ready to accept operator commands. The operator presses the button 22 ("disable grounding knives"), the programmable relay receives the specified command to the corresponding discrete input (sensor 8), checks the received command for validity. The specified command is enabled (lamp 25). The programmable relay supplies voltage to the reversible electric motor drive of the grounding knives 12, the movable contacts of the grounding knives start moving, the position sensor of the grounding knives 8 ("on") opens (Fig. 1). The programmable relay extinguishes the lamp 25 of the grounding knives ("on"), and the lamp 24 ("position not determined") of the grounding knives, switches to intermittent mode and cocks the program timer for the time required to move the contacts of the grounding knives to the "off" position (lamp 23) (Fig. 4). When the contacts of the grounding knives have moved to the "off" position (lamp 23), the disconnector sensor 10 ("off") is triggered, the program relay stops the reversible electric motor drive of the grounding knives 12, extinguishes the lamp 24 of the grounding knives ("position not determined") and lights the lamp 23 grounding knives ("disabled") (figure 4). The control system is ready to receive the following command, for example: "close the earthing blades" or "close the isolator" or "shut down".

The technical result from the use of the utility model is to provide control of the disconnector and grounding knives in the absence of stationary power supply with low voltage alternating current. At the same time, a decrease in material consumption and a decrease in the cost of the "aggregate" product (disconnector + control device) is achieved due to the ability to control several disconnectors using a single control device.

Thus, the task facing the utility model has been solved.

In addition, the proposed control device can be made in a mobile design to ensure vandal resistance. And taking into account the fact that the influence of atmospheric influences on the disconnector and sensors can lead to abnormal situations (jamming of the moving parts of the disconnector and position sensors), it is proposed to use reed switches that do not have moving parts as position sensors, and a temporary control function is introduced into the control scheme algorithm operations - in case of exceeding the time of the disconnector transition from one position to another, the control system diagnoses the emergency situation and prohibits manipulations with the disconnector until the causes of the emergency situation are eliminated.

Claims (1)

A control device for a disconnector with a linear drive, containing a power source, on and off starters, contacts for supplying voltage to an electric motor, characterized in that it is equipped with an executive unit, in the case of which there is a programmable relay that provides an algorithm for controlling the disconnector drive, directly connected to the controller located in the executive unit a DC power supply, which, in turn, is electrically connected to linear electric drives, as well as to the contacts of the disconnector position (P) and grounding knives (ZN), located, respectively, on an additional stand and mounting strips fixed on the base of the disconnector frame.

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