Full-automatic self-cleaning air filter control system

Abstract

The utility model provides a full-automatic self-cleaning air filter control system which comprises an air inlet flow meter, an air outlet flow meter and a pressure sensor, the air inlet flow meter, the air outlet flow meter and the pressure sensor are jointly connected with a control module, and the air inlet end of an air filter is further connected with an air inlet electromagnetic valve. The air outlet end of the air filter is further connected with an air outlet electromagnetic valve. The air inlet electromagnetic valve and the air outlet electromagnetic valve are both connected with the control module. The air filter is further connected with a purging module, the purging pipeline is connected with the air filter, the self-cleaning purging electromagnetic valve is installed on the purging pipeline, the self-cleaning purging fan is connected to one end of the purging pipeline, and the control module is connected with the self-cleaning purging electromagnetic valve and the motor. The use state of the air filter is monitored through the air inlet flow meter, the air outlet flow meter and the pressure sensor, the full-cycle automatic operation of the air filter is realized, the working intensity is reduced, the real-time monitoring is realized, and the working condition of equipment is ensured to meet the use requirement.

Description

TECHNICAL FIELD

[0001] The utility model relates to waste gas treatment craft air filter technology field especially, and relates to a full -automatic self -cleaning air filter control system. BACKGROUND

[0002] In the industrial production process, industrial workshop often emits various industrial dust to pollute the workshop air environment, harm the health of the operating staff, damage the workshop machine equipment, and the emission will pollute the atmospheric environment and cause social harm. Therefore, in order to industrial dust control and industrial dust treatment, improve the workshop operating air environment and prevent air pollution, various measures need to be taken to control industrial dust, so that the working site of the staff reaches the health standard, and the discharge of the environmental protection facility reaches the discharge standard.

[0003] The existing air filter equipment mostly needs to rely on the inspection personnel to check and replace the filter screen irregularly, cannot timely remind the inspection personnel of the filter use condition, the filter cannot extend the service life through self-cleaning, the automation level is low, and the process of checking the filter use condition increases the workload of the inspection personnel. UTILITY MODEL CONTENT

[0004] The utility model solves the technical problem, provides a full -automatic self -cleaning air filter control system, can automatically detect the filter use condition, automatically alarm and remind to replace the filter, automatically clean and other filter use full -cycle automation management functions, guarantees the health of the personnel of workshop production, reduces the workload of the inspection personnel.

[0005] The utility model is realized as follows:

[0006] The utility model provides a full -automatic self -cleaning air filter control system, including the air intake flowmeter being arranged at the air intake end of air filter, the air outlet flowmeter being arranged at the air outlet end of air filter and the pressure sensor for detecting the internal pressure of air filter, air intake flowmeter, air outlet flowmeter and pressure sensor are connected with control module in common,

[0007] The air intake end of air filter is also connected with air intake solenoid valve, the air outlet end of air filter is also connected with air outlet solenoid valve, and air intake solenoid valve and air outlet solenoid valve are connected with control module.

[0008] The air filter is also connected with the purge module, the purge module includes purge pipeline, self-cleaning purge solenoid valve and self-cleaning purge fan driven by motor, the purge pipeline is connected with air filter, the self-cleaning purge solenoid valve is installed on the purge pipeline, the self-cleaning purge fan is connected at the end of the purge pipeline away from air filter, and the control module is connected with self-cleaning purge solenoid valve and motor respectively.

[0009] Further, the control module comprises a PLC, three electromagnetic valve control loop modules for controlling the switching of relay coil and one motor control loop module for controlling the switching of contactor coil;

[0010] Each of the electromagnetic valve control loop modules comprises a manual remote control rotary switch SA connected with live wire, the manual remote control rotary switch SA is connected with a first switch module, the first switch module is connected with a first intermediate relay, the first intermediate relay is connected with zero line, and the first switch module comprises an electromagnetic valve off button, an electromagnetic valve on button and a first PLC normally open contact, one end of the electromagnetic valve off button and the first PLC normally open contact is connected with the manual remote control rotary switch SA, the electromagnetic valve off button is connected with the electromagnetic valve on button, the other end of the first PLC normally open contact and the electromagnetic valve on button is connected with the first intermediate relay, the first intermediate relay has a first normally open contact, one end of the first normally open contact is connected between the electromagnetic valve off button and the electromagnetic valve on button, and the other end of the first normally open contact is connected between the electromagnetic valve on button and the first intermediate relay;

[0011] The inlet electromagnetic valve, the outlet electromagnetic valve and the self-cleaning purge electromagnetic valve are connected with commercial power through the circuit breaker and the first normally open contact;

[0012] The motor control loop module comprises a manual remote control rotary switch SA connected with live wire, the manual remote control rotary switch SA is connected with a second switch module, the second switch module is connected with a contactor KM, the contactor KM is connected with zero line, the second switch module comprises a motor off button, a motor on button and a second PLC normally open contact, one end of the motor off button and the second PLC normally open contact is connected with the manual remote control rotary switch SA, the motor off button is connected with the motor on button, the other end of the second PLC normally open contact and the motor on button is connected with the contactor KM, the contactor KM has a first contactor normally open contact, one end of the first contactor normally open contact is connected between the motor off button and the motor on button, and the other end of the first contactor normally open contact is connected between the motor on button and the contactor KM;

[0013] The motor is connected with commercial power through the circuit breaker and the first contactor normally open contact 13.

[0014] Further, the first intermediate relay further comprises a second normally open contact and a first normally closed contact, one end of the second normally open contact and the first normally closed contact is connected with the live wire, the other end of the second normally open contact is connected with a solenoid valve opening signal lamp, the other end of the first normally closed contact is connected with a solenoid valve closing signal lamp, and the solenoid valve opening signal lamp and the solenoid valve closing signal lamp are connected with the zero line.

[0015] Further, the first switch module is further connected with a second intermediate relay for feeding back an operation signal to the PLC, and the second intermediate relay has a third normally open contact connected to the PLC.

[0016] Further, the contactor KM further has a second contactor normally open contact and a first contactor normally closed contact, one end of the second contactor normally open contact and the first contactor normally closed contact is connected with the live wire, the second contactor normally open contact is connected with a motor opening signal lamp, the first contactor normally closed contact is connected with a motor closing signal lamp, and the motor opening signal lamp and the motor closing signal lamp are connected with the zero line respectively.

[0017] Further, the contactor KM further has a third contactor normally open contact connected to the PLC for feeding back an operation signal to the PLC.

[0018] Further, a thermal relay FR is further included, the thermal relay FR is connected between the contactor KM and the zero line, and the thermal relay FR has a thermal relay normally open contact, one end of the thermal relay normally open contact is connected with the live wire, and the other end is connected with a motor fault indicating lamp, and the motor fault indicating lamp is connected with the live wire.

[0019] Further, the live wire is further connected with a current measurement loop composed of an ammeter and a mutual inductor.

[0020] The air filter control system has the advantages that: the air filter control system can monitor the use state of the air filter through the air inlet flowmeter, the air outlet flowmeter and the pressure sensor, can remotely monitor the full cycle use state of the air filter through the control module, and the operator can also operate the corresponding equipment control button on the control panel. BRIEF DESCRIPTION OF DRAWINGS

[0021] The air filter control system will be further described below with reference to the embodiments and the drawings.

[0022] Figure 1 It is a full-automatic self-cleaning air filter control system structural schematic view.

[0023] Figure 2The utility model discloses an air inlet electromagnetic valve, air outlet electromagnetic valve, self-cleaning purge electromagnetic valve and motor and commercial power connection structure schematic view.

[0024] Figure 3 The utility model discloses electromagnetic valve control loop principle drawing.

[0025] Figure 4 The utility model discloses motor control loop principle drawing.

[0026] Figure 5 The utility model discloses electromagnetic valve remote input output principle drawing.

[0027] Figure 6 The utility model discloses motor remote input output principle drawing.

[0028] Figure 7 The utility model discloses PLC and air inlet electromagnetic valve, air outlet electromagnetic valve, self-cleaning purge electromagnetic valve and motor control principle drawing.

[0029] Figure 8 The utility model discloses PLC and air inlet flowmeter, air outlet flowmeter and pressure sensor control principle drawing.

[0030] Figure 9 The utility model discloses current measurement loop principle drawing.

[0031] Figure 10 The utility model discloses control panel schematic view.

[0032] Mark explanation in drawing:

[0033] 1, air filter;2, air inlet flowmeter;3, air outlet flowmeter;4, pressure sensor;5, control module;6, air inlet electromagnetic valve;7, air outlet electromagnetic valve;8, purge module;81, purge pipeline;82, self-cleaning purge electromagnetic valve;83, motor;84, self-cleaning purge fan;9, first switch module;10, first PLC normally open contact;11, second PLC normally open contact;12, first normally open contact;13, first contactor normally open contact;14, second normally open contact;15, first normally closed contact;16, third normally open contact;17, second contactor normally open contact;18, first contactor normally closed contact;19, third contactor normally open contact;20, thermal relay normally open contact;21, first switch module;22, second switch module;23, mutual inductor. DETAILED DESCRIPTION

[0034] Please refer to Figures 1 to 10The utility model provides a kind of full-automatic self-cleaning air filter control system, including the air intake flowmeter 2 being arranged in the air filter 1 air inlet end, the air outlet flowmeter 3 being arranged in the air filter 1 air outlet end and the pressure sensor for detecting the internal pressure of air filter 1, the air intake flowmeter 2, air outlet flowmeter 3 and pressure sensor 4 are connected with control module 5 in common;

[0035] The air filter 1 air inlet end is also connected with air intake solenoid valve 6, the air filter 1 air outlet end is also connected with air outlet solenoid valve 7, the air intake solenoid valve 6 and air outlet solenoid valve 7 are connected with control module 5, and control module 5 is also connected with commercial power supply;

[0036] The air filter 1 is also connected with purging module 8, according to the difference of air intake flowmeter 2 and air outlet flowmeter 3 and the value of pressure sensor 4, control module 5 judges whether air filter 1 is blocked.If air filter 1 is blocked, control module 5 makes air intake solenoid valve 6 close, and opens self-cleaning purging solenoid valve 82, and starts motor 83, to clean air filter 1.If after cleaning, the difference of air intake flowmeter 2 and air outlet flowmeter 3 and the value of pressure sensor 4 still reach the set value, it is judged that air filter 1 needs to replace filter screen.

[0037] The purging module 8 includes purging pipeline 81, self-cleaning purging solenoid valve 82 and self-cleaning purging fan 84 driven by motor 83, the purging pipeline 81 is connected with air filter 1, the self-cleaning purging solenoid valve 82 is installed on purging pipeline 81, the self-cleaning purging fan 84 is connected at the end of purging pipeline 81 away from air filter 1, and the control module 5 is connected with self-cleaning purging solenoid valve 82 and motor 83 respectively.

[0038] Specifically, the control module 5 includes PLC, control panel connected with PLC, three electromagnetic valve control loop modules for controlling relay coil switch attraction and one motor control loop module for controlling contactor coil attraction; the model of PLC is S7-200SMART. The control panel further includes a touch screen connected with the PLC. The values fed back by the air intake flowmeter 2, the air outlet flowmeter 3 and the pressure sensor 4 can be monitored through the touch screen. Moreover, the remote start-stop signal, the remote signal, the running signal of the air intake solenoid valve 6, the air outlet solenoid valve 7 and the self-cleaning purging solenoid valve 82, and the remote start-stop signal, the remote signal, the running signal and the fault signal of the motor 83 can also be monitored through the touch screen.

[0039] Each of the electromagnetic valve control circuit modules comprises an electromagnetic valve manual remote control rotary switch SA connected with a fire wire, the electromagnetic valve manual remote control rotary switch SA is connected with a first switch module 21, the first switch module 21 is connected with a first intermediate relay KA1, the first intermediate relay KA1 is connected with a zero wire, and the first switch module 21 comprises an electromagnetic valve off button SP, an electromagnetic valve on button ST and a first PLC normally open contact 10, one end of the electromagnetic valve off button SP and the first PLC normally open contact 10 is connected with the electromagnetic valve manual remote control rotary switch SA, the electromagnetic valve off button SP is connected with the electromagnetic valve on button ST, the other end of the first PLC normally open contact 10 and the electromagnetic valve on button ST are connected with the first intermediate relay KA1, the first intermediate relay KA1 has a first normally open contact 12, one end of the first normally open contact 12 is connected between the electromagnetic valve off button SP and the electromagnetic valve on button ST, the other end of the first normally open contact 12 is connected between the electromagnetic valve on button ST and the first intermediate relay KA1;

[0040] The air inlet electromagnetic valve 6, the air outlet electromagnetic valve 7 and the self-cleaning purge electromagnetic valve 82 are connected with the commercial power through corresponding circuit breakers and the first normally open contact 12;

[0041] Taking the opening of the air inlet electromagnetic valve 6 as an example, when the circuit breaker QF01 is in the closed state, the first normally open contact 12 is attracted, and the air inlet electromagnetic valve 6 is opened. The attraction of the first normally open contact 12 can be manually controlled or automatically controlled.

[0042] When the manual control is performed, the electromagnetic valve manual remote control rotary switch SA is rotated to the manual control position. The electromagnetic valve on button ST is pressed, the first intermediate relay KA1 is powered on, the first normally open contact 12 is attracted, and the air inlet electromagnetic valve 6 is opened. The electromagnetic valve off button SP is pressed, the first intermediate relay KA1 is powered off, the first normally open contact 12 is disconnected, and the air inlet electromagnetic valve 6 is closed.

[0043] When the automatic control is performed, the electromagnetic valve manual remote control rotary switch SA is rotated to the automatic control position, the PLC controls the first PLC normally open contact 10 to be closed, the first intermediate relay KA1 is powered on, the first normally open contact 12 is attracted, the air inlet electromagnetic valve 6 is opened, and vice versa, the air inlet electromagnetic valve 6 is closed.

[0044] The opening and closing principles of the air outlet electromagnetic valve 7 and the self-cleaning purge electromagnetic valve 82 are the same as above.

[0045] It is worth mentioning that when the air filter 1 is in normal operation, the inlet electromagnetic valve 6 and the outlet electromagnetic valve 7 are kept in an open state, and the self-cleaning purge electromagnetic valve 82 is kept in a closed state. When the PLC determines that the air filter 1 is blocked according to the difference between the inlet flowmeter 2 and the outlet flowmeter 3 and the value of the pressure sensor 4, the self-cleaning purge electromagnetic valve 82 is opened, the outlet electromagnetic valve 7 is kept in an open state, and the inlet electromagnetic valve 6 is closed.

[0046] The motor control loop module comprises a motor manual remote control rotary switch SA connected with a live wire, a second switch module 22 connected with the motor manual remote control rotary switch SA, a contactor KM connected with the second switch module 22 and a zero line, and the second switch module 22 comprises a motor on button SP, a motor off button ST and a second PLC normally open contact 11, one end of the motor on button SP and the second PLC normally open contact 11 is connected with the motor manual remote control rotary switch SA, the motor on button SP is connected with the motor off button ST, the other end of the second PLC normally open contact 11 and the motor off button ST is connected with the contactor KM, and the contactor KM has a first contactor normally open contact 13, one end of the first contactor normally open contact 13 is connected between the motor on button SP and the motor off button ST, and the other end of the first contactor normally open contact 13 is connected between the motor off button ST and the contactor KM.

[0047] The motor 83 is connected with the power supply through the circuit breaker and the first contactor normally open contact 13.

[0048] When the air filter 1 is purged, the motor 83 is started to drive the self-cleaning purge fan 84 to operate to purge the filter screen of the air filter 1.

[0049] When the circuit breaker QF04 is in a closed state, the start and stop of the motor 83 can also be manually controlled or automatically controlled. When manually controlled, the motor manual remote control rotary switch SA is rotated to a manual gear position, the motor off button ST is pressed, the contactor KM is powered on, the first contactor normally open contact 13 is attracted, and the motor 83 is started. The motor on button SP is pressed, the contactor KM is powered off, the first contactor normally open contact 13 is disconnected, and the motor 83 is turned off.

[0050] When automatically controlled, the motor manual remote control rotary switch SA is rotated to an automatic gear position, the second PLC normally open contact 11 is closed under the control of the PLC, the contactor KM is powered on, the first contactor normally open contact 13 is attracted, and the motor 83 is turned on. Conversely, the motor 83 is turned off.

[0051] Specifically, the first intermediate relay KA1 further comprises a second normally open contact 14 and a first normally closed contact 15, one end of the second normally open contact 14 and the first normally closed contact 15 is connected with the live wire, the other end of the second normally open contact 14 is connected with the electromagnetic valve opening signal lamp HG, the other end of the first normally closed contact 15 is connected with the electromagnetic valve closing signal lamp HR, the electromagnetic valve opening signal lamp HG and the electromagnetic valve closing signal lamp HR are connected with the zero line.

[0052] When the first intermediate relay KA1 is powered on, the second normally open contact 14 is attracted, the electromagnetic valve opening signal lamp HG is lit, and the first normally closed contact 15 is disconnected, and the electromagnetic valve closing signal lamp HR is extinguished. When the first intermediate relay KA1 is powered off, the second normally open contact 14 is disconnected, the electromagnetic valve opening signal lamp HG is extinguished, and the first normally closed contact 15 is attracted, and the electromagnetic valve closing signal lamp HR is lit. Through the electromagnetic valve opening signal lamp HG and the electromagnetic valve closing signal lamp HR, the opening and closing state of the electromagnetic valve can be directly observed.

[0053] Specifically, the first switch module 21 is further connected with a second intermediate relay KA2 for feeding back the running signal to the PLC, the second intermediate relay KA2 has a third normally open contact 16, and the third normally open contact 16 is connected to the PLC.

[0054] Specifically, the contactor KM further has a second contactor normally open contact 17 and a first contactor normally closed contact 18, one end of the second contactor normally open contact 17 and the first contactor normally closed contact 18 is connected with the live wire, the second contactor normally open contact 17 is connected with the motor opening signal lamp HG, the first contactor normally closed contact 18 is connected with the motor closing signal lamp HR, and the motor opening signal lamp HG and the motor closing signal lamp HR are respectively connected with the zero line. Similarly, when the contactor KM is powered on, the second contactor normally open contact 17 is closed, the motor opening signal lamp HG is lit, the first contactor normally closed contact 18 is disconnected, and the motor closing signal lamp HR is extinguished. When the contactor KM is powered off, the second contactor normally open contact 17 is disconnected, the motor opening signal lamp HG is extinguished, the first contactor normally closed contact 18 is attracted, and the motor closing signal lamp HR is lit. Through the motor opening signal lamp HG and the motor closing signal lamp HR, the opening and closing state of the motor can be directly observed

[0055] Specifically, the contactor KM further has a third contactor normally open contact 19, and the third contactor normally open contact 19 is connected to the PLC for feeding back the running signal to the PLC.

[0056] Specifically, the hot relay FR is connected between the contactor KM and the zero line, the hot relay FR has hot relay normally open contact 20, one end of the hot relay normally open contact 20 is connected with the fire line, the other end is connected with the motor fault indicator lamp HY, the motor fault indicator lamp HY is connected with the fire line. When the motor 83 fails, the hot relay FR acts, the normally closed contact of the hot relay FR is disconnected, the contactor KM is powered off, the normally open contact of the hot relay FR is attracted, and the motor fault indicator lamp HY is lit.

[0057] Specifically, the fire line is also connected with a current measurement circuit composed of an ammeter and a transformer 23. The model of the transformer 23 is 20 / 5, and the accuracy level is 0.2S 0.5 level. The current is fed back to the ammeter installed on the control panel through the transformer 23, and the currents of the ABC three-phase during the operation of the equipment can be directly displayed.

[0058] The electromagnetic valve open signal lamp HG, the electromagnetic valve close signal lamp HR, the motor open signal lamp HG, the motor close signal lamp HR, the electromagnetic valve open button ST, the electromagnetic valve close button SP, the motor open button ST, the motor close button SP, the motor fault indicator lamp HY, the electromagnetic valve manual remote control rotary switch SA, the motor manual remote control rotary switch SA, the touch screen and the ammeter are all arranged on the control panel.

[0059] Although the specific embodiments of the present application are described above, those skilled in the art should understand that the specific examples described are only illustrative, and are not intended to limit the scope of the present application, and equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present application should be covered within the scope of the claims of the present application.

Claims

1. A fully automatic self-cleaning air filter control system, characterized in that: It includes an intake flow meter installed at the air inlet end of the air filter, an outlet flow meter installed at the air outlet end of the air filter, and a sensor for detecting the internal pressure of the air filter. The intake flow meter, the outlet flow meter, and the pressure sensor are all connected to a control module. The air filter inlet end is also connected to an inlet solenoid valve, and the air filter outlet end is also connected to an outlet solenoid valve. Both the inlet solenoid valve and the outlet solenoid valve are connected to the control module. The air filter is also connected to a purging module, which includes a purging pipe, a self-cleaning purging solenoid valve, and a self-cleaning purging fan driven by an electric motor. The purging pipe is connected to the air filter, the self-cleaning purging solenoid valve is installed on the purging pipe, and the self-cleaning purging fan is connected to the end of the purging pipe away from the air filter. The control module is connected to the self-cleaning purging solenoid valve and the electric motor respectively.

2. The fully automatic self-cleaning air filter control system as described in claim 1, characterized in that: The control module includes a PLC, a control panel connected to the PLC, three solenoid valve control circuit modules for controlling the activation of relay coil switches, and a motor control circuit module for controlling the activation of contactor coils. Each of the aforementioned solenoid valve control circuit modules includes a solenoid valve manual / remote control rotary switch SA connected to the live wire. The solenoid valve manual / remote control rotary switch SA is connected to a first switch module, which is connected to a first intermediate relay. The first intermediate relay is connected to the neutral wire, and the first switch module includes a solenoid valve close button, a solenoid valve open button, and a first PLC normally open contact. One end of the solenoid valve close button and the first PLC normally open contact are both connected to the solenoid valve manual / remote control rotary switch SA. The solenoid valve close button is connected to the solenoid valve open button. The other end of the first PLC normally open contact and the solenoid valve open button are both connected to the first intermediate relay. The first intermediate relay has a first normally open contact. One end of the first normally open contact is connected between the solenoid valve close button and the solenoid valve open button, and the other end of the first normally open contact is connected between the solenoid valve open button and the first intermediate relay. The intake solenoid valve, the exhaust solenoid valve and the self-cleaning purge solenoid valve are all connected to the mains power through a circuit breaker and the first normally open contact. The motor control circuit module includes a motor manual / remote control rotary switch SA connected to the live wire. The motor manual / remote control rotary switch SA is connected to a second switch module, which is connected to a contactor KM. The contactor KM is connected to the neutral wire. The second switch module includes a motor off button, a motor on button, and a second PLC normally open contact. One end of the motor off button and the second PLC normally open contact are both connected to the motor manual / remote control rotary switch SA. The motor off button and the motor on button are connected. The other end of the second PLC normally open contact and the motor on button are both connected to the contactor KM. The contactor KM has a first normally open contact. One end of the first normally open contact is connected between the motor off button and the motor on button, and the other end of the first normally open contact is connected between the motor on button and the contactor KM. The motor is connected to the mains power supply through a circuit breaker and the normally open contact of the first contactor.

3. The fully automatic self-cleaning air filter control system as described in claim 2, characterized in that: The first intermediate relay also includes a second normally open contact and a first normally closed contact. One end of the second normally open contact and the first normally closed contact is connected to the live wire, and the other end of the second normally open contact is connected to a solenoid valve open indicator light. The other end of the first normally closed contact is connected to a solenoid valve close indicator light. The solenoid valve open indicator light and the solenoid valve close indicator light are connected to the neutral wire.

4. The fully automatic self-cleaning air filter control system as described in claim 2, characterized in that: The first switch module is also connected to a second intermediate relay for feeding back operating signals to the PLC. The second intermediate relay has a third normally open contact, which is connected to the PLC.

5. The fully automatic self-cleaning air filter control system as described in claim 2, characterized in that: The contactor KM also has a second normally open contact and a first normally closed contact. One end of the second normally open contact and the first normally closed contact is connected to the live wire. The second normally open contact is connected to a motor on signal light, and the first normally closed contact is connected to a motor off signal light. The motor on signal light and the motor off signal light are respectively connected to the neutral wire.

6. The fully automatic self-cleaning air filter control system as described in claim 2, characterized in that: The contactor KM also has a third normally open contact, which is connected to the PLC to provide a feedback operation signal to the PLC.

7. The fully automatic self-cleaning air filter control system as described in claim 2, characterized in that: It also includes a thermal relay FR, which is connected between the contactor KM and the neutral wire. The thermal relay FR has a normally open contact, one end of which is connected to the live wire, and the other end is connected to a motor fault indicator light, which is also connected to the live wire.

8. The fully automatic self-cleaning air filter control system as described in claim 2, characterized in that: The live wire is also connected to a current measurement circuit consisting of an ammeter and a current transformer.

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