Column switch controller remote control function detection system

Abstract

The invention discloses a remote control function detection system for a pole-mounted switch controller, which relates to the technical field of electric power systems and comprises an execution module, wherein the execution module comprises a power supply module, a first wiring terminal group, a voltmeter, a switch remote control unit, a second wiring terminal group, a wiring terminal, and a resistor. The power supply module is electrically connected to the first wiring terminal group, the second wiring terminal group is arranged at two ends of the switch controller, the wiring terminal is electrically connected to one end of the second wiring terminal group, the power supply module is electrically connected to the voltmeter, the resistor is connected in series to two ends of the first wiring terminal group, the power supply module is used to step down the direct current taken by the switch controller to supply power to the entire execution module, the first wiring terminal group is used to take direct current from the switch controller, the voltmeter is used to detect the voltage signal output by the switch controller, and the switch remote control unit is used to send a control signal to a remote control switch to turn it on. The invention has the characteristic of saving workload.

Description

Technical Field

[0001] The invention relates to the technical field of power systems, in particular to a remote control function detection system for a pole-mounted switch controller. Background Art

[0002] Pole switch controllers are commonly used in power systems, especially in distribution networks, to control and monitor switchgear on poles. After long-term operation, the switches on distribution poles may fail in remote control operations due to various reasons. Due to the pressure of power supply reliability, the operating equipment cannot perform actual opening and closing operations, and it is impossible to determine whether the fault occurs in the switch body or the switch controller. The switch controller needs to be disassembled and returned to the warehouse for testing, and then installed back to the site after the test, resulting in high labor intensity and low work efficiency for the operation and maintenance personnel. The Chinese patent with publication number CN118763617A discloses a digital twin control device for pole switches, which controls the pole switches by means of a real-time data model through a temperature sensor. This device mainly controls the pole switches through temperature parameters, and it is difficult to ensure the accuracy of control.

[0003] The present application manufactures a portable simulation device, which can perform on-site remote control function tests of pole-mounted switches without opening or closing the switch, and realize all functions required for the remote control test of the pole-mounted switch. Summary of the invention

[0004] The object of the present invention is to provide a remote control function detection system for a column switch controller to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a remote control function detection system for a column switch controller, comprising an execution module, the execution module comprising a power supply module, a terminal group 1, a voltmeter, a switch remote control unit, a terminal group 2, a terminal, and a resistor, the power supply module is electrically connected to the terminal group 1, the terminal group 2 is arranged at both ends of the switch controller, the terminal is electrically connected to one end of the terminal group 2, the power supply module is electrically connected to the voltmeter, the resistor is connected in series with both ends of the terminal group 1, the power supply module is used to step down the direct current taken by the switch controller to power the entire execution module, the terminal group 1 is used to take direct current from the switch controller, the voltmeter is used to detect the voltage signal output by the switch controller, the switch remote control unit is used to send a control signal to the remote control switch to turn it on, the terminal group 2 is used to transmit the direct current of the switch controller to the terminal group 1, the terminal is used to form a series circuit with the resistor, and the resistor is used to make the switch controller have insufficient current to reach the pull-in threshold.

[0006] According to the above technical solution, the working method of the system is:

[0007] S0. Find the terminal group 1 at both ends of the switch controller, select the line connected to the remote control switch, cut off the line and set a new terminal at the broken end, and use the terminal to restore the line connection;

[0008] S1. When a problem occurs in the remote control of an electric device controlled by a switch controller, the switch controller is checked by using an execution module to determine whether the fault occurs in the switch body or the switch controller.

[0009] According to the above technical solution, in S1, the specific steps are:

[0010] S1-1. When the remote control switch fails continuously, connect terminal group 2 and terminal group 1. At this time, the voltmeter displays the voltage at both ends of the switch controller. The remote control switch is turned on by the switch remote control unit. If the voltage at both ends of the switch controller reaches the rated voltage, it means that the fault occurs in the switch body. If the voltage at both ends of the switch controller is lower than or higher than the rated voltage, it means that the fault occurs in the switch controller.

[0011] S1-2. When the remote control switch fails occasionally, connect the two ends of terminal group 2 to the terminal and one end of terminal group 1 respectively, and disconnect the line between the terminal and terminal group 1. At this time, the resistor and the switch controller are connected in series, and the remote control switch is controlled to be turned on multiple times through the switch remote control unit. If there is voltage at both ends of the resistor each time, and the current of the switch controller is not enough to attract the internal armature, it means that the fault occurs in the switch body. If there is no voltage at both ends of the resistor, it means that the fault occurs in the switch controller.

[0012] According to the above technical solution, the resistor is a sliding rheostat, and both ends of the sliding rheostat are connected to terminal group three, and the terminal group three is used to be detachably installed with the power module. The system also includes a calculation module, and the calculation module includes a resistance input module, a critical current calculation module, and an attraction judgment module. The resistance input module is electrically connected to the critical current calculation module, and the attraction judgment module is electrically connected to the switch controller. The resistance input module is used to input the current resistance of the sliding rheostat, and the critical current calculation module is used to calculate the current when the internal armature of the switch controller is just attracted, and the attraction judgment module is used to detect whether the internal armature of the switch controller is attracted to trigger the closure of the switch body.

[0013] According to the above technical solution, the working method of the system also includes:

[0014] S2. After determining the specific location of the fault, the resistance is increased or decreased by adjusting the sliding rheostat to match the current of the current switch controller;

[0015] S3. After the sliding rheostat is removed, the current passing through the switch controller is adjusted by connecting it in parallel at both ends of the switch controller and between the wiring terminal and the wiring terminal group 1.

[0016] According to the above technical solution, in S2, when the remote control switch fails continuously and the rated voltage is not reached at both ends of the switch controller:

[0017] S2-1, if the voltage indication number at this time is lower than the rated voltage and is not 0, let the effective current of the trigger switch controller internal armature be I0, the power supply voltage is V and remains unchanged, the switch controller's own resistance is R1, and the armature contact resistance is R0, then When the contact resistance R0 increases, I0 decreases, which causes the switch controller's own voltage V0 = I0R1 to decrease, that is, the voltage reading is lower than the rated voltage. At this time, adjust the resistance R of the sliding rheostat connected in parallel at both ends of the switch controller. x , so that the total resistance is reduced to increase the effective current I0;

[0018] S2-2. If the voltage reading at this time is higher than the rated voltage, the contact resistance of the armature contact R0 decreases due to the internal short circuit of the coil, and I0 increases, V0 = I0R1 increases, that is, the voltage reading is higher than the rated voltage. At this time, adjust the resistance value R of the sliding rheostat connected in series at one end of the switch controller. x , which increases the total resistance to reduce the effective current I0.

[0019] According to the above technical solution, in S2-1, R x The calculation method is: before adjustment, the contact resistance R0 is increased to R q , the voltage of the switch controller itself changes from V0 to V2, and the total resistance before and after adjustment is equal to keep I0 unchanged, that is, The power supply voltage V remains constant, that is, R q Substituting into the previous formula, we can get R x ;

[0020] In S2-2, R x The calculation method is: before adjustment, the contact resistance R0 is reduced to R g , the voltage of the switch controller itself changes from V0 to V3. The total resistance before and after adjustment is equal to keep I0 unchanged, that is, R x +R1+R g =R1+R0, R q Substituting into the previous formula, we can get R x .

[0021] According to the above technical solution, in S3, when the situation in S2-1 occurs, the adjusted sliding rheostat is removed from the power module, so that the two ends of the terminal group three are connected to the two ends of the terminal group one, so that the sliding rheostat is connected in parallel at both ends of the switch controller; when the situation in S2-2 occurs, the two ends of the terminal group three are connected to the terminal and the terminal on the side of the terminal group connected to the remote control switch.

[0022] According to the above technical solution, the system uses a single-chip microcomputer as the controller of the device, detects the voltage signal output by the switch controller, drives the relay output when specific conditions are met, and feeds back the state change to the switch controller.

[0023] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0024] By setting multiple wiring terminals, external devices can be connected to different terminals to achieve different test effects; the on-site remote control function test of the pole-mounted switch can be carried out when the line is not connected, and the continuous failure and occasional failure of the remote control switch can be tested; when encountering the problem of failure of the control effect of the switch controller caused by the decrease of effective current and the increase of current, by calculating the current appropriate sliding rheostat resistance and temporarily connecting it to the position of the switch controller, temporary repairs can be made to the two faults. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0026] Figure 1 It is a schematic diagram of the circuit principle of the present invention;

[0027] Figure 2 It is a module schematic diagram of the present invention.

[0028] In the figure: 1. remote control switch; 2. switch controller; 3. wiring terminal; 4. wiring terminal group 1; 5. resistor; 6. wiring terminal group 2; 7. wiring terminal group 3; 8. power module; 9. voltmeter; 10. switch body. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figure 1 and Figure 2 The present invention provides a technical solution: a remote control function detection system for a column terminal group 4, including an execution module, the execution module including a power module 8, a terminal group 4, a voltmeter 9, a switch remote control unit, a terminal group 2 6, a terminal, and a resistor 5, the power module 8 is electrically connected to the terminal group 4, the terminal group 2 6 is arranged at both ends of the terminal group 4, the terminal 3 is electrically connected to one end of the terminal group 2 6, the power module 8 is electrically connected to the voltmeter 9, the resistor 5 is connected in series with both ends of the terminal group 4, the power module 8 is used to step down the direct current taken from the terminal group 4 to supply power to the entire execution module, the terminal group 4 is used to take direct current from the terminal group 4, the voltmeter 9 is used to detect the voltage signal output by the terminal group 4, the switch remote control unit is used to send a control signal to the remote control switch 1 to turn it on, the terminal group 2 6 is used to transmit the direct current of the terminal group 4 to the terminal group 4, the terminal 3 is used to form a series circuit with the resistor 5, and the resistor 5 is used to make the terminal group 4 have insufficient current to reach the pull-in threshold;

[0031] When the existing pole switch system works, the remote control switch 1 is first turned on, at which time the terminal group 4 is powered, and the pole switch body 10 is turned on, and the electrical equipment starts to work. Since the pole switch body 10 and the terminal group 4 may be damaged, it is not convenient to judge. Therefore, when the remote control switch 1 is turned on, the voltage of the terminal group 4 is detected to determine whether the terminal group 4 is damaged. If it is not damaged, it may be that the pole switch body 10 is damaged, resulting in the failure of the remote control operation;

[0032] The system works as follows:

[0033] S0, find the terminal group 14 at both ends of the terminal group 14, select the line on one side connected to the remote control switch 1, cut off the line and set a new terminal 3 at the broken end, and use the terminal 3 to restore the connection of the line;

[0034] S1. When a problem occurs in the remote control of the electric equipment controlled by the terminal block 14, the execution module is used to check the terminal block 14 to determine whether the fault occurs in the switch body 10 or the terminal block 14;

[0035] In S1, the specific steps are:

[0036] S1-1. When the remote control switch 1 fails continuously, the terminal group 2 6 is connected to the terminal group 1 4. At this time, the voltmeter 9 displays the voltage at both ends of the terminal group 1 4. The remote control switch 1 is turned on by the switch remote control unit. If the voltage at both ends of the terminal group 1 4 reaches the rated voltage, it indicates that the fault occurs in the switch body 10. If the voltage at both ends of the terminal group 1 4 is lower than or higher than the rated voltage, it indicates that the fault occurs in the terminal group 1 4.

[0037] S1-2, when the remote control switch 1 occasionally fails, connect the two ends of the terminal group 2 6 to one end of the terminal group 3 and the terminal group 1 4 respectively, and disconnect the line between the terminal group 3 and the terminal group 1 4. At this time, the resistor 5 and the terminal group 1 4 are connected in series, and the remote control unit is used to control the remote control switch 1 to be turned on multiple times. If there is voltage at both ends of the resistor 5 each time, and the current of the terminal group 1 4 is insufficient to attract the internal armature, it indicates that the fault occurs in the switch body 10. If there is no voltage at both ends of the resistor 5, it indicates that the fault occurs in the terminal group 1 4.

[0038] The contacts of the relay will be affected by factors such as arcing, wear and oxidation during long-term use. When the relay is frequently energized and released, the contacts may be burned or oxides may be formed due to the arc, which will cause poor contact, thereby increasing the contact resistance, which will lead to a decrease in the effective current. The voltage of the relay itself will decrease and cause the armature to fail to attract. In some cases, if the relay is overheated during operation, the contact material may be deformed due to thermal expansion, the contact area of ​​the contact will increase, resulting in a decrease in contact resistance, the current will rise, the voltage of the relay itself will increase, and the overvoltage may cause the internal components of the relay to fail, affecting the control effect of the terminal group 4, and the effective current required cannot be checked during routine inspections. The current is judged. In order to solve the above problem, the resistor 5 is a sliding rheostat. The two ends of the sliding rheostat are connected with the terminal group three 7. The terminal group three 7 is used to be detachably installed with the power module 8. The system also includes a calculation module. The calculation module includes a resistance input module, a critical current calculation module, and a pull-in judgment module. The resistance input module is electrically connected to the critical current calculation module. The pull-in judgment module is electrically connected to the terminal group one 4. The resistance input module is used to input the current resistance 5 of the sliding rheostat. The critical current calculation module is used to calculate the current when the internal armature of the terminal group one 4 is just pulled in. The pull-in judgment module is used to detect whether the internal armature of the terminal group one 4 is pulled in to trigger the switch body 10 to close.

[0039] The system's working method also includes:

[0040] S2. After determining the specific location of the fault, the resistance is increased or decreased by adjusting the sliding rheostat to match the current of the current terminal group 4;

[0041] S3, after removing the sliding rheostat, connect it in parallel at both ends of the wiring terminal group 4 and between the wiring terminal 3 and the wiring terminal group 4 to adjust the current passing through the wiring terminal group 4;

[0042] In S2, when the remote control switch 1 fails continuously and the rated voltage is not reached at both ends of the terminal group 14:

[0043] S2-1. If the voltage meter 9 shows a value lower than the rated voltage and is not 0, let the effective current of the trigger terminal group 4 internal armature be I0, the power supply voltage V remains unchanged, the terminal group 4 resistance itself is R1, and the armature contact resistance is R0, then When the contact resistance R0 increases, I0 decreases, which causes the voltage V0=I0R1 of the terminal group 4 to decrease, that is, the reading of the voltmeter 9 is lower than the rated voltage. At this time, the resistance value R of the sliding rheostat connected in parallel at both ends of the terminal group 4 is adjusted. x , so that the total resistance is reduced to increase the effective current I0;

[0044] S2-2. If the reading of the voltmeter 9 is higher than the rated voltage, the contact resistance of the armature contact R0 decreases and I0 increases due to the internal short circuit of the coil, V0 = I0R1 increases, that is, the reading of the voltmeter 9 is higher than the rated voltage. At this time, adjust the resistance value R of the sliding rheostat connected in series at one end of the terminal group 4. x , so that the total resistance increases to reduce the effective current I0;

[0045] In S2-1, R x The calculation method is: before adjustment, the contact resistance R0 is increased to R q , the voltage of terminal group 14 changes from V0 to V2, and the total resistance before and after adjustment is equal to keep I0 unchanged, that is, The power supply voltage V remains constant, that is, R q Substituting into the previous formula, we can get R x ;

[0046] In S2-2, R x The calculation method is: before adjustment, the contact resistance R0 is reduced to R g , the voltage of terminal group 14 changes from V0 to V3, and the total resistance before and after adjustment is equal to keep I0 unchanged, that is, R x +R1+R g =R1+R0, R q Substituting into the previous formula, we can get R x ;

[0047] In S3, when the situation in S2-1 occurs, the adjusted sliding rheostat is removed from the power module 8, so that the two ends of the terminal group three 7 are connected to the two ends of the terminal group one 4, so that the sliding rheostat is connected in parallel to the two ends of the terminal group one 4; when the situation in S2-2 occurs, the two ends of the terminal group three 7 are connected to the terminal 3 and the terminal on the side of the terminal group connected to the remote control switch 1.

[0048] The system uses a single chip microcomputer as the controller of the device, detects the voltage signal output by the terminal group 4, drives the relay output when specific conditions are met, and feeds back the state change to the terminal group 4.

[0049] When encountering the problem of failure of control effect of terminal group 4 caused by effective current reduction and current increase, by calculating the current appropriate sliding rheostat resistance and temporarily connecting it to the position of terminal group 4, both faults can be temporarily repaired. The operation and maintenance personnel only need to write down the terminal group 4 that needs to be replaced and then replace it in a centralized manner. There is no need to carry terminal group 4 during inspection, saving workload.

[0050] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0051] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A column switch controller remote control function detection system, characterized in that: The invention comprises an execution module, wherein the execution module comprises a power supply module (8), a first terminal group (4), a voltmeter (9), a switch remote control unit, a second terminal group (6), a terminal (3), and a resistor (5); the power supply module (8) is electrically connected to the first terminal group (4); the second terminal group (6) is arranged at two ends of a switch controller (2); the terminal (3) is electrically connected to one end of the second terminal group (6); the power supply module (8) is electrically connected to the voltmeter (9); the resistor (5) is connected in series to two ends of the first terminal group (4); and the power supply module (8) is used to switch the switch controller (2) ) is used to step down the DC power taken from the switch controller (2) to supply power to the entire execution module, the terminal group one (4) is used to take DC power from the switch controller (2), the voltmeter (9) is used to detect the voltage signal output by the switch controller (2), the switch remote control unit is used to send a control signal to the remote control switch (1) to turn on the remote control switch (1), the terminal group two (6) is used to transmit the DC power of the switch controller (2) to the terminal group one (4), the terminal (3) is used to form a series circuit with the resistor (5), and the resistor (5) is used to prevent the switch controller (2) from having sufficient current to reach the pull-in threshold.

2. The column switch controller remote control function detection system according to claim 1, characterized in that: The working method of the system includes the following steps: S0, find the terminal block group 1 (4) at both ends of the switch controller (2), select the line on one side connected to the remote control switch (1), cut the line and set a new terminal block (3) at the broken end, and use the terminal block (3) to restore the connection of the line; S1. When a problem occurs in the remote control of an electric device controlled by a switch controller (2), the switch controller (2) is checked using an execution module to determine whether the fault occurs in the switch body (10) or the switch controller (2).

3. The column switch controller remote control function detection system according to claim 2, characterized in that: The step S1 specifically includes the following sub-steps: S1-1. When the remote control switch (1) fails continuously, the second terminal group (6) is connected to the first terminal group (4). At this time, the voltmeter (9) displays the voltage at both ends of the switch controller (2). The remote control switch (1) is turned on by controlling the switch remote control unit. If the voltage at both ends of the switch controller (2) reaches the rated voltage, it indicates that the fault occurs in the switch body (10). If the voltage at both ends of the switch controller (2) is lower than or higher than the rated voltage, it indicates that the fault occurs in the switch controller (2). S1-2. When the remote control switch (1) occasionally fails, the two ends of the second terminal group (6) are connected to one end of the terminal (3) and the terminal group (4), respectively, and the line between the terminal (3) and the terminal group (4) is disconnected. At this time, the resistor (5) and the switch controller (2) are connected in series, and the remote control switch (1) is controlled to be turned on multiple times through the switch remote control unit. If there is a voltage at both ends of the resistor (5) each time, and the current of the switch controller (2) is insufficient to attract the internal armature, it indicates that the fault occurs in the switch body (10). If there is no voltage at both ends of the resistor (5), it indicates that the fault occurs in the switch controller (2).

4. The column switch controller remote control function detection system according to claim 3, characterized in that: The resistor (5) is a sliding rheostat, and the two ends of the sliding rheostat are connected to a terminal group three (7), and the terminal group three (7) is used to be detachably installed with a power module (8). The system also includes a calculation module, and the calculation module includes a resistance input module, a critical current calculation module, and an attraction judgment module. The resistance input module is electrically connected to the critical current calculation module, and the attraction judgment module is electrically connected to the switch controller (2). The resistance input module is used to input the current resistance (5) of the sliding rheostat, and the critical current calculation module is used to calculate the current when the internal armature of the switch controller (2) is just attracted. The attraction judgment module is used to detect whether the internal armature of the switch controller (2) is attracted to trigger the switch body (10) to close.

5. The column switch controller remote control function detection system according to claim 4, characterized in that: The system's working method also includes: S2, after determining the specific location of the fault, increase or decrease the resistance by adjusting the sliding rheostat to match the current of the current switch controller (2); S3. After the sliding rheostat is removed, it is connected in parallel to both ends of the switch controller (2) and between the wiring terminal (3) and the wiring terminal group 1 (4) to adjust the current passing through the switch controller (2).

6. The column switch controller remote control function detection system according to claim 5, characterized in that: In the step S2, when the remote control switch (1) continues to fail and the rated voltage is not reached at both ends of the switch controller (2), the following sub-steps are included: S2-1. If the voltage meter (9) shows a value lower than the rated voltage and not equal to 0, let the effective current that triggers the internal armature of the switch controller (2) to be attracted be I0, the power supply voltage V remains unchanged, the resistance of the switch controller (2) itself is R1, and the contact resistance of the armature contact is R0, then When the contact resistance R0 increases, I0 decreases, which causes the voltage V0=I0R1 of the switch controller (2) to decrease, that is, the reading of the voltmeter (9) is lower than the rated voltage. At this time, the resistance value R of the sliding rheostat connected in parallel at both ends of the switch controller (2) is adjusted. x , so that the total resistance is reduced to increase the effective current I0; S2-2. If the reading of the voltmeter (9) is higher than the rated voltage at this time, the contact resistance of the armature contact R0 decreases due to the internal short circuit of the coil, and I0 increases, V0 = I0R1 increases, that is, the reading of the voltmeter (9) is higher than the rated voltage. At this time, adjust the resistance value R of the sliding rheostat connected in series at one end of the switch controller (2) x , which increases the total resistance to reduce the effective current I0.

7. The column switch controller remote control function detection system according to claim 6, characterized in that: In step S2-1, R x The calculation method is: before adjustment, the contact resistance R0 is increased to R q , the voltage of the switch controller (2) changes from V0 to V2, and the total resistance before and after adjustment is equal to keep I0 unchanged, that is, The power supply voltage V remains constant, that is, R q Substituting into the previous formula, we can get R x .

8. The column switch controller remote control function detection system according to claim 7, characterized in that: In step S2-2, R x The calculation method is: before adjustment, the contact resistance R0 is reduced to R g , the voltage of the switch controller (2) changes from V0 to V3. The total resistance before and after adjustment is equal to keep I0 unchanged, that is, R x +R1+R g =R1+R0, R q Substituting into the previous formula, we can get R x .

9. The column switch controller remote control function detection system according to claim 8, characterized in that: In step S3, when the situation in step S2-1 occurs, the adjusted sliding rheostat is removed from the power module (8), so that the two ends of the wiring terminal group three (7) are connected to the two ends of the wiring terminal group one (4), so that the sliding rheostat is connected in parallel to the two ends of the switch controller (2); when the situation in step S2-2 occurs, the two ends of the wiring terminal group three (7) are connected to the wiring terminal (3) and the terminal on the side of the wiring terminal group that is connected to the remote control switch (1).

10. The column switch controller remote control function detection system according to claim 9, characterized in that: The system uses a single chip microcomputer as a controller of the device, detects a voltage signal output by a switch controller (2), drives a relay output when a specific condition is met, and feeds back a state change to the switch controller (2).

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