CN213151719U - Power supply control circuit and power supply cabinet for motor no-load test - Google Patents
Power supply control circuit and power supply cabinet for motor no-load test Download PDFInfo
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- CN213151719U CN213151719U CN202021555478.8U CN202021555478U CN213151719U CN 213151719 U CN213151719 U CN 213151719U CN 202021555478 U CN202021555478 U CN 202021555478U CN 213151719 U CN213151719 U CN 213151719U
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Abstract
A power supply control circuit and a power supply cabinet for a motor no-load test comprise a power supply circuit, at least one electric control circuit and at least one monitoring circuit. The power circuit is connected with phase voltages through the first phase line, the second phase line and the third phase line respectively, and outputs initial electric signals after the voltage transformation processing and the rectification processing are carried out on the connected phase voltages of the second phase line and the third phase line. The electric control circuit is switched on when receiving the starting signal and the initial electric signal, phase voltage is output to the motor through the power supply line, and the electric control circuit is switched off when receiving a protection instruction. When the monitoring circuit monitors that the current value in the power supply line is larger than the protection current value or when the leakage current is detected, the protection instruction is output to the electric control circuit. The power supply control circuit and the power supply cabinet can supply power to at least one motor, can realize autonomous monitoring and cut-off, and are simple to operate, high in safety and high in reliability.
Description
Technical Field
The application belongs to the technical field of overhaul of nuclear power stations, and particularly relates to a power supply control circuit and a power supply cabinet for a motor no-load test.
Background
In the process of nuclear power station maintenance, a large number of low-voltage three-phase motors (hereinafter referred to as motors) need to be subjected to performance test, disassembly inspection is also needed if necessary, the motors subjected to disassembly inspection need to be subjected to an electrifying operation test after assembly is completed, and various performances after disassembly are tested so as to check whether the disassembled motors can meet the use requirements. At present, when a power-on running test is performed on a motor, the method used is that an operator firstly disconnects a circuit breaker in a universal power box of a maintenance room, then a three-phase power cable is led out from a switch outlet and connected to a motor wiring terminal needing a no-load test, the circuit breaker in the universal power box is closed after the three-phase power cable is checked to be correct, and a three-phase power enters the motor through the three-phase power cable to start the no-load test. Because the power of the motors used by all the systems is different, the output power of the universal power box is fixed and cannot be adjusted to a proper protection fixed value, an operator must use a pincer-shaped ammeter to continuously monitor the motor test process, and if the current exceeds the standard, the circuit breaker in the power box is manually disconnected in time to cut off the power supply so as to protect the motor. However, the above method has the following drawbacks: first, artifical continuous monitoring electric current, the risk is big, inefficiency, and there is great time difference from discovering that the electric current is unusual to the operation of artificial outage, and causes danger to operation personnel's personal safety. Second, to the great motor of power, directly use the circuit breaker operation power transmission, the pick-up current is very big, and powerful pick-up current forms the impact to the circuit breaker easily, causes the circuit breaker itself to catch fire and burns out, and powerful electric arc also brings the security threat for the operation personnel. Thirdly, during the overhaul of the nuclear power station, under the window where a plurality of systems are in an overhaul state, the condition that a plurality of motors need no-load tests often occurs at the same time; at present, the low-efficiency operation mode causes a large amount of manpower to enter a maintenance room to carry out test work, and the operation period is possibly influenced due to the insufficient number of power supplies.
Therefore, the traditional power box for the motor power-on operation test needs to monitor current continuously and manually, and is powered off manually when current abnormality is found, so that the problems of high risk, low efficiency and reduced safety and reliability are caused.
SUMMERY OF THE UTILITY MODEL
The utility model provides a power control circuit and power cabinet of motor no-load test aims at solving traditional power supply box that is used for motor circular telegram operation test and has need artifical continuous monitoring current, then carries out artificial outage when discovering the electric current anomaly to lead to the risk big, inefficiency, reduced the problem of security and reliability.
A first aspect of the embodiments of the present application provides a power control circuit for a motor no-load test, which is connected to at least one motor, and includes:
the power supply circuit comprises a first phase line, a second phase line and a third phase line, wherein the first phase line, the second phase line and the third phase line are respectively and correspondingly connected with a first phase voltage, a second phase voltage and a third phase voltage, and the power supply circuit is used for outputting an initial electric signal after the second phase voltage and the third phase voltage are subjected to voltage transformation processing and rectification processing;
at least one electric control circuit connected with the power circuit and used for conducting when receiving a starting signal and the initial electric signal so as to transmit one of the first phase voltage, the second phase voltage and the third phase voltage to the motor or switching off when receiving a protection command; and
and the monitoring circuits are connected with the electrical control circuits in a one-to-one correspondence manner and are used for generating a protection current value and outputting the protection instruction to the electrical control circuits when the current output by the electrical control circuits is monitored to be larger than the protection current value or when leakage current is detected.
A second aspect of the embodiments of the present application provides a power cabinet for motor no-load test, including:
the power supply control circuit described above; and
and the cabinet body is used for packaging the power supply control circuit.
Compared with the prior art, the embodiment of the invention has the following beneficial effects: the power supply control circuit and the power supply cabinet for the motor no-load test can supply power to at most three motors simultaneously, so that the motors can be subjected to the no-load test, and risks, labor and time consumption caused by using a temporary power supply are avoided. Through monitoring circuit 30, carry out real-time supervision to the electric current condition of power supply line to send protection instruction to electric control circuit 20 circuit, thereby avoid the power supply line to transship and cause the harm to the motor, and prevent that the power supply line electric leakage from causing bodily injury to the operation personnel. Through the electric control circuit 20, each power supply circuit is automatically controlled, and the safety risk of arc burn caused by manual operation of the circuit breaker QF by operators is avoided.
Drawings
Fig. 1 is a schematic block diagram of a power control circuit for a motor no-load test according to an embodiment of the present disclosure;
FIG. 2 is an exemplary circuit schematic of the power control circuit shown in FIG. 1;
fig. 3 is a schematic structural diagram of a power cabinet for a motor no-load test according to an embodiment of the present application.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Fig. 1 is a schematic block structure diagram of a power control circuit for a motor no-load test according to an embodiment of the present application, and for convenience of description, only parts related to the embodiment are shown, and detailed descriptions are as follows:
a power supply control circuit for motor no-load test is connected with at least one motor and comprises a power supply circuit 10, at least one electric control circuit 20 and at least one monitoring circuit 30. The electric machine is referred to herein as a "low-voltage three-phase motor".
The power circuit 10 includes a first phase line a, a second phase line B, and a third phase line C, the power circuit 10 is connected to the electrical control circuit 20, and the monitoring circuit 30 is connected to the electrical control circuit 20. The number of the electric control circuits 20 is the same as that of the monitoring circuits 30.
The first phase line A, the second phase line B and the third phase line C are correspondingly connected with a first phase voltage, a second phase voltage and a third phase voltage respectively. The power supply circuit 10 is configured to output an initial electrical signal after performing voltage transformation processing and rectification processing on the second-phase voltage and the third-phase voltage.
Specifically, the power supply circuit 10 may supply three-phase alternating current to the electrical control circuit 20. The effective values of the first phase voltage, the second phase voltage and the third phase voltage are 380V +/-10%, alternating current voltage with the effective value of 110V is obtained after transformation processing, the 110V alternating current voltage is converted into initial electric signals after rectification processing, and the initial electric signals are direct current.
The electric control circuit 20 comprises a power supply line, when receiving a starting signal and an initial electric signal, the electric control circuit 20 is switched on, the power supply line is switched on to work, one of the first phase voltage, the second phase voltage and the third phase voltage is output to the motor through the power supply line, or the power supply line is switched off when receiving a protection instruction, so that the power supply line is switched off, and the power supply to the motor is stopped.
Specifically, the electrical control circuit 20 directly conveys the power supply signal to the motor needing no-load test through a special interface, so that unreliability caused by manual wiring is avoided, and risks caused by poor contact to the whole test operation are avoided.
Specifically, the power supply control circuit for the motor no-load test at least comprises one electric control circuit 20 and at most three electric control circuits 20, wherein power supply lines of the three electric control circuits 20 are respectively connected with a first phase line A, a second phase line B and a third phase line C and are respectively connected with a motor, so that a first phase voltage, a second phase voltage and a third phase voltage are respectively connected and output to the motors connected with the first phase line, the second phase line and the third phase line. Therefore, the power supply control circuit provided by the embodiment can be used for at least one motor to perform the no-load test and can be used for at most three motors to perform the no-load test.
The monitoring circuit 30 sets a protection current value according to the received adjustment instruction, and outputs a protection instruction to the electrical control circuit 20 when it is monitored that the current value output from the electrical control circuit 20 is larger than the protection current value or when a leakage current is detected.
Specifically, the protection current value set by the adjustment command depends on the rated current value of the motor to be connected, and in general, the protection current value may be set to be 1.5 times the rated current value. The adjustment command is manually input by the operator.
The power supply control circuit for the motor no-load test can supply power to at most three motors simultaneously, so that the motors can be subjected to the no-load test, and risks, labor and time consumption caused by using a temporary power supply are avoided. Through monitoring circuit 30, carry out real-time supervision to the electric current condition of power supply line to send protection instruction to electric control circuit 20 circuit, thereby avoid the power supply line to transship and cause the harm to the motor, and prevent that the power supply line electric leakage from causing bodily injury to the operation personnel. Through the electric control circuit 20, each power supply circuit is automatically controlled, and the safety risk of arc burn caused by manual operation of the circuit breaker QF by operators is avoided.
The power control circuit of motor no-load test that this embodiment provided, convenient to use in motor no-load test operation, easy operation, user only need will treat during no-load test's motor passes through the cable access power supply line, set for the protection current value according to the rated ampere meter of motor data plate, and the no-load test of motor just can be accomplished to rethread input start signal. The current is prevented from being monitored continuously, the risk is high, the efficiency is low, the time is short, and the risk is high when the artificial power-off operation is carried out when the current is found to be abnormal. For a motor with high power, the circuit breaker QF is directly used for operating and transmitting power, and the starting current of the high-power motor is very large, so that the strong impact current easily damages an arc extinguishing chamber of the circuit breaker QF, the circuit breaker QF is burnt by fire, and the strong electric arc brings safety threat to operators.
Fig. 2 is a schematic diagram of an exemplary circuit of the power control circuit shown in fig. 1, which only shows the parts related to the present embodiment for convenience of explanation, and the details are as follows:
in an alternative embodiment, the power circuit 10 further includes a breaker QF, a transformer T and a rectifier bridge D1.
The transformer T includes a primary coil and a secondary coil. Specifically, the voltage ratio of the transformer T is 3: 1.
The first input end, the second input end and the third input end of the circuit breaker QF are respectively connected with the first phase line A, the second phase line B and the third phase line C, and the first output end, the second output end and the third output end of the circuit breaker QF are respectively connected with an electric control circuit 20; the second output end of the breaker QF is connected with the first end of the primary coil and is used for accessing a second-phase voltage; a third output end of the breaker QF is connected with a second end of the primary coil and is used for accessing a third phase voltage; the first output end of the secondary coil is connected with the first input end of the rectifier bridge D1, the second output end of the secondary coil is connected with the second input end of the rectifier bridge D1, the first output end of the rectifier bridge D1 is connected with the electric control circuit 20, and the second output end of the rectifier bridge D1 is grounded.
Specifically, the effective values of the first phase voltage, the second phase voltage and the third phase voltage are 380V ± 10%, the second phase voltage and the third phase voltage are subjected to voltage transformation processing by a transformer T to obtain an alternating voltage with an effective value of 110V, the 110V alternating voltage is rectified by a rectifier bridge D1 and then converted into an initial electrical signal, and the initial electrical signal is direct current.
In an optional embodiment, the power circuit 10 further includes a first power indicator L1, a second power indicator L2, a third power indicator L3, a first power voltmeter V1, a second power voltmeter V2, a third power voltmeter V3, a first complete machine ammeter I1, a second complete machine ammeter I2, and a third complete machine ammeter I3.
The first power indicator light L1 is bridged on the first phase line A and the second phase line B, the second power indicator light L2 is bridged on the second phase line B and the third phase line C, and the third power indicator light L3 is bridged on the first phase line A and the third phase line C; the first power supply voltmeter V1 is connected in parallel with the first power supply indicator lamp L1, the second power supply voltmeter V2 is connected in parallel with the second power supply indicator lamp L2, and the third power supply voltmeter V3 is connected in parallel with the third power supply indicator lamp L3; the first whole-machine ammeter I1 is connected in series with the first phase line A, the second whole-machine ammeter I2 is connected in series with the second phase line B, and the third whole-machine ammeter I3 is connected in series with the third phase line C.
Specifically, the first power indicator lamp L1 is used for indicating the power feeding conditions of the first phase line a and the second phase line B, the second power indicator lamp L2 is used for indicating the power feeding conditions of the second phase line B and the third phase line C, and the third power indicator lamp L3 is used for indicating the power feeding conditions of the first phase line a and the third phase line C.
The first power supply voltage meter V1 is used for displaying a voltage difference between the first phase line a and the second phase line B, the second power supply voltage meter V2 is used for displaying a voltage difference between the second phase line B and the third phase line C, and the third power supply voltage meter V3 is used for displaying a voltage difference between the first phase line a and the third phase line C.
The first whole machine ammeter I1 is used for displaying the current value flowing through the first phase line A; the second complete machine ammeter I2 is used for displaying the current value flowing through the second phase line B, and the third complete machine ammeter I3 is used for displaying the current value flowing through the third phase line C. If the current values displayed by the first whole machine ammeter I1, the second whole machine ammeter I2 and the third whole machine ammeter I3 have large deviation, the abnormality is indicated, and the inspection and the processing are required in time.
Optionally, the power circuit 10 further includes a first fuse FU1, a second fuse FU2, and a third fuse FU 3.
First fuse FU1 concatenates in first phase line A, and second fuse FU2 concatenates in second phase line B, and the fuse concatenates in third phase line C.
In an optional embodiment, the monitoring circuit 30 includes a first current transformer, a second current transformer, a third current transformer, a fourth current transformer, a load monitoring processor, and a current setting potentiometer.
The load monitoring system comprises a first current transformer, a second current transformer, a third current transformer, a load monitoring processor, a first phase line power supply line, a second phase line power supply line, a third phase line power supply line, a first phase line power supply line, a second phase line power supply line, a third phase line power supply line, a load monitoring; the primary side of a fourth current transformer is connected with a first phase line power supply line, a second phase line power supply line and a third phase line power supply line, and the secondary side of the fourth current transformer is connected with a load monitoring processor; the current setting potentiometer is connected with the load monitoring processor.
The load monitoring processor comprises a normally closed switch which is connected in series with a connecting wire between the winding and the stop switch.
Specifically, the first current transformer is used for sampling the current on a power supply line of the first phase line and feeding the current back to the load monitoring processor; the second current transformer is used for sampling the current on the second phase line power supply line and feeding the current back to the load monitoring processor; and the third current transformer is used for sampling the current on the power supply line of the third phase line and feeding the current back to the load monitoring processor. And the fourth current transformer is used for sampling leakage current and feeding the leakage current back to the load monitoring processor.
The load monitoring processor is configured to determine whether a protection instruction needs to be output according to feedback of the first current transformer, the second current transformer, the third current transformer, and the fourth current transformer, and output the protection instruction to the electrical control circuit 20 when a current value in the first phase line power supply line/the second phase line power supply line/the third phase line power supply line is greater than a protection current value or when a leakage current is detected. After the load detection processor outputs a protection instruction, the normally closed switch is switched off.
The resistance value of the current setting potentiometer is adjustable, and the resistance value of the current setting potentiometer is correspondingly adjusted through an input adjusting instruction.
Optionally, the electrical control circuit 20 further includes a first load current meter, a second load current meter and a third load current meter.
The first load ammeter is connected in series with the first phase line power supply circuit, the second load ammeter is connected in series with the second phase line power supply circuit, and the third load ammeter is connected in series with the third phase line power supply circuit.
Specifically, the first load ammeter is used for displaying a current value on a first phase line power supply line, the second load ammeter is used for displaying a current value on a second phase line power supply line, and the third load ammeter is used for displaying a current value on a third phase line power supply line.
Optionally, the electrical control circuit 20 further comprises a load indicator light.
The load indicator lamp is connected in parallel with the winding of the contactor. When the winding of the contactor is electrified, the load indicator lamp is lighted.
The power supply control circuit shown in fig. 2 has three electrical control circuits 20 and three monitoring circuits 30.
The first electric control circuit 20 comprises a contactor KM1, a starting switch SB1, a stopping switch SB2, a first load ammeter I4, a second load ammeter I5, a third load ammeter I6 and a load indicator lamp L4; the second electric control circuit 20 comprises a contactor KM2, a starting switch SB3, a stopping switch SB4, a first load ammeter I7, a second load ammeter I8, a third load ammeter I9 and a load indicator lamp L5; the third electric control circuit 20 comprises a contactor KM3, a start switch SB5, a stop switch SB6, a first load ammeter I10, a second load ammeter I11, a third load ammeter I12 and a load indicator lamp L6.
The first monitoring circuit 30 corresponding to the first electric control circuit 20 comprises a first current transformer CT1, a second current transformer CT2, a third current transformer CT3, a fourth current transformer CT4, a load monitoring processor IC1 and a current setting potentiometer ADJ1, wherein a normally closed switch of the load monitoring processor IC1 is IC 10; the second monitoring circuit 30 corresponding to the second electric control circuit 20 includes a first current transformer CT5, a second current transformer CT6, a third current transformer CT7, a fourth current transformer CT8, a load monitoring processor IC2 and a current setting potentiometer ADJ2, and a normally closed switch of the load monitoring processor IC2 is IC 20; the third monitoring circuit 30 corresponding to the third electric control circuit 20 includes a first current transformer CT9, a second current transformer CT10, a third current transformer CT11, a fourth current transformer CT12, a load monitoring processor IC3, and a current setting potentiometer ADJ3, and the normally closed switch of the load monitoring processor IC3 is IC 30.
Fig. 3 is a schematic structural diagram of a power cabinet for a motor no-load test according to an embodiment of the present application, and for convenience of description, only parts related to the embodiment are shown, and detailed descriptions are as follows:
a power cabinet for motor no-load test comprises the power control circuit and a cabinet body X1.
The cabinet body X1 is used for packaging a power supply control circuit. The cabinet X1 has openings in various areas for mounting portions of the electronic components shown in fig. 2.
The following describes in detail the installation manner, structure and parameter performance of the power control circuit and the power cabinet with reference to fig. 2 and 3:
this power cabinet includes cabinet body X1, this cabinet body X1 can be stainless steel material, the surface can be blue, there is power cable access mouth X2 at this cabinet body X1 top, power cable access mouth X2's diameter is with just accessible power cable as the standard, this cabinet body X1's front has three drill way X3, be used for installing first power indicator L1 respectively, second power indicator L2 and third power indicator L3, first power indicator L1, the luminous colour of second power indicator L2 and third power indicator L3 is yellow respectively, green, red, withstand voltage is AC 380V.
Three orifices X4 are respectively arranged below the three orifices X3 and are respectively used for installing a first power supply voltmeter V1, a second power supply voltmeter V2 and a third power supply voltmeter V3, the first power supply voltmeter V1, the second power supply voltmeter V2 and the third power supply voltmeter V3 are all formal voltmeters, the measuring range is AC500V, and dial plates of the first power supply voltmeter V1, the second power supply voltmeter V2 and the third power supply voltmeter V3 face the outer side of the cabinet body. Three orifices X5 are respectively arranged below the three orifices X4 and are respectively used for mounting a first whole machine ammeter I1, a second whole machine ammeter I2 and a third whole machine ammeter I3, the three ammeters are all righting ammeters, the measuring range is AC500A, and dial plates of the ammeters face the outer side of the cabinet body.
An opening X6 is formed below the three openings X5, an operating handle is mounted on the opening X6, the operating handle is connected with a circuit breaker QF, and the closed state and the open state of the circuit breaker QF are switched by operating the operating handle. The capacity of the operating handle is not less than 500A.
The lower part of the hole X6 is provided with holes X7, X8 and X9, and the hole X7 is used for mounting a first load ammeter I4, a second load ammeter I5 and a third load ammeter I6 in the first electric control circuit 20; the port X8 is used for installing a first load ammeter I7, a second load ammeter I8 and a third load ammeter I9 in the second electric control circuit 20; the port X9 is used to mount the first load current meter I10, the second load current meter I11 and the third load current meter I12 in the third electrical control circuit 20. The three first load ammeters, the three second load ammeters and the three third load ammeters are all formal ammeters, and measuring ranges are all AC 500A.
The opening X10 is arranged below the opening X7, the opening X10 is used for installing a load carrying indicator lamp L4 in the first electric control circuit 20, and the load carrying indicator lamp L4 is red in light emitting color and is resistant to voltage DC 110V. The opening X11 is arranged below the opening X8, the opening X11 is used for installing a load carrying indicator lamp L5 in the second electric control circuit 20, and the load carrying indicator lamp L5 is red in light emitting color and is resistant to the voltage DC 110V. An opening X12 is arranged below the opening X9, an opening X12 is used for installing a load indicator lamp L6 in the third electric control circuit 20, and the load indicator lamp L6 is red in light emitting color and is resistant to voltage DC 110V.
An opening X13 is arranged below the opening X10, and an opening X13 is used for installing a starting switch SB1 and a stopping switch SB2 in the first electric control circuit 20; the opening X14 is arranged below the opening X11, and the opening X14 is used for installing a starting switch SB3 and a stopping switch SB4 in the second electric control circuit 20; below the opening X12 is an opening X15 and opening X15 is used to mount a start switch SB5 and a stop switch SB6 in the third electrical control circuit 20. The three starting switches and the three stopping switches are all control buttons and are all normally-open switches.
The opening X16 is arranged below the opening X13, the opening X16 is used for installing a current setting potentiometer ADJ1 in the first monitoring circuit 30, and a knob of the current setting potentiometer ADJ1 is exposed outside the cabinet body X1, so that an operator can input an adjusting command by rotating the knob, and the resistance value is changed. The opening X17 is arranged below the opening X14, the opening X17 is used for installing a current setting potentiometer ADJ2 in the second monitoring circuit 30, and a knob of the current setting potentiometer ADJ2 is exposed outside the cabinet body X1, so that an operator can input an adjusting command by rotating the knob, and the resistance value is changed. The opening X18 is arranged below the opening X15, the opening X18 is used for installing a current setting potentiometer ADJ3 in the third monitoring circuit 30, a knob of the current setting potentiometer ADJ3 is exposed outside the cabinet body X1, and an operator can input an adjusting command by rotating the knob, so that the resistance value is changed.
The side of the cabinet body is provided with openings X19, X20 and X21, and the opening X19 is used for connecting out a first phase line power supply circuit, a second phase line power supply circuit and a third phase line power supply circuit of the first electric control circuit 20, so that the first phase line power supply circuit, the second phase line power supply circuit and the third phase line power supply circuit are externally connected with a motor M1. The port X20 is used for receiving a first phase line power supply circuit, a second phase line power supply circuit and a third phase line power supply circuit of the second electrical control circuit 20, so that the first phase line power supply circuit, the second phase line power supply circuit and the third phase line power supply circuit are externally connected with the motor M2. The port X21 is used for receiving a first phase line power supply circuit, a second phase line power supply circuit and a third phase line power supply circuit of the third electrical control circuit 20, so that the first phase line power supply circuit, the second phase line power supply circuit and the third phase line power supply circuit are externally connected with the motor M3.
The cabinet body X1 is provided with: first fuse FU1, second fuse FU2, third fuse FU3, transformer T, rectifier bridge D1, three first current transformer, three second current transformer, three third current transformer, three fourth current transformer, three load monitoring treater and three contactor.
The capacities of the first fuse FU1, the second fuse FU2 and the third fuse FU3 are not less than 600A. The transformer T has an input rated AC380V and an output voltage AC 110V. The reverse breakdown voltage of the rectifier bridge D1 is not less than 1000V, and the rated current is not less than 5A. The rated working voltage of the winding of the contactor is DC110V, and the breaking capacity of the main contact is not less than 600A.
The working principle and working process of the power control circuit and the power cabinet are described in detail below with reference to fig. 2 and 3:
first step, with power cabinet fixed mounting in maintenance factory building one side, can install many this devices according to the factory building area actual conditions, the factory building requires the through-air drying, and the illumination is good. A first phase line A, a second phase line B and a third phase line C in the power cable are connected through a power cable access port X2 at the top of a cabinet body X1, a breaker QF is closed, and the first phase voltage, the second phase voltage and the third phase voltage are respectively sent to a first power supply voltmeter V1, a second power supply voltmeter V2 and a third power supply voltmeter V3 through a first fuse FU1 and a second fuse FU 2-level third fuse FU 3. The first power voltage meter V1, the second power voltage meter V2 and the third power voltage meter V3 respectively show that the current voltages should be 380V ± 10%. The second phase voltage and the third phase voltage are loaded to a primary coil of the transformer T, and a secondary coil of the transformer T outputs 110V alternating voltage which is rectified into an initial electric signal through a rectifier bridge D1. Meanwhile, the first power indicator L1, the second power indicator L2, and the third power indicator L3 are turned on, respectively, and the whole apparatus enters a standby state.
And secondly, connecting the end B0 of the special load output connecting cable X22 to a wiring terminal of a motor to be subjected to an idle load test, determining that the wiring is fastened, detecting and determining that no abnormity exists in insulation, and inserting the end A0 of the special load output connecting cable X22 into an opening X19/X20/X21 on the side surface of the cabinet body X1.
And thirdly, looking at rated current values calibrated on nameplates of the motors M1, M2 and M3 to be subjected to no-load tests, respectively adjusting current setting potentiometers ADJ1, ADJ2 and ADJ3 to be 1.5 times of rated currents of the motors M1, M2 and M3, and finishing the preparation work.
For the power-on operation of motor M1: the starting switch SB1 is pressed, the starting switch SB1 is closed, a 110V direct current power supply forms a loop through the closed SB1, the normally closed SB2, the normally closed switch of the load monitoring processor IC1, the coil of the contactor KM1 and the load loaded indicator lamp L4, the coil of the contactor KM1 is electrically excited, the auxiliary contact and the main contact of the contactor KM1 are closed, and the current is transmitted to the A0 end of the special load output connecting cable X22 at the orifice X19 through the closed main contact, the first phase line power supply circuit, the second phase line power supply circuit and the point phase line power supply circuit and then is transmitted to the motor M1 through the B0 end of the special load output connecting cable, and the motor starts to run. At the same time, the load loading indicator lamp L4 is lit, and the first load loading is successful.
In the operation process, the current values displayed by the first load ammeter I4, the second load ammeter I5 and the third load ammeter I6 are continuously monitored to judge the operation current condition of the motor M1, and if three current values are unbalanced, the motor M1 needs to be stopped for inspection in time. In the shutdown process, the stop switch SB2 is pressed, the supply of the initial power supply signal is stopped, the coil of the contactor KM1 loses power, the load on-load indicator lamp L4 loses power and extinguishes, the contactor KM1 returns to the off state, the output current is cut off, and the motor M1 stops running.
In the process of first load operation, a first current transformer CT1, a second current transformer CT2 and a third current transformer CT3 respectively collect currents on a first phase line power supply line, a second phase line power supply line and a third phase line power supply line, and send the currents to a load monitoring processor IC1 for processing, when the current of any phase line power supply line reaches a protection current value, the load monitoring processor IC1 sends a protection instruction to trip a contactor KM1, output current is cut off, and the purpose of protecting a motor M1 is achieved. The fourth current transformer CT4 is used for collecting leakage current, namely when the leakage condition occurs, the fourth current transformer CT4 transmits the leakage current to the load monitoring processor IC1, and the load monitoring processor IC1 sends a protection instruction to enable the contactor KM1 to trip and cut off output current, so that the purpose of preventing operators from getting an electric shock is achieved.
The power-on operation of the motor M2 and the power-on operation of the motor M3 are the same as the power-on operation of the motor M1, and are not described again.
In the whole operation process, the first power supply voltmeter V1, the second power supply voltmeter V2 and the third power supply voltmeter V3 are observed, the current voltages are respectively 380V +/-10% and normal, and if the current voltages are abnormal, the current voltages are checked and processed in time. In the process of on-load operation, the first complete machine ammeter I1, the second coconut I2 and the third complete machine ammeter I3 should be continuously observed, the three complete machine ammeters should not have large deviation, and if abnormality is detected and processed in time, the breaker QF should be placed in a disconnected state after use.
To sum up, the utility model provides a pair of motor no-load test's power control circuit and power cabinet can supply power to at most three motor simultaneously for they carry out no-load test, avoid using expending of risk, manpower and time that interim power supply brought. Through monitoring circuit 30, carry out real-time supervision to the electric current condition of power supply line to send protection instruction to electric control circuit 20 circuit, thereby avoid the power supply line to transship and cause the harm to the motor, and prevent that the power supply line electric leakage from causing bodily injury to the operation personnel. Through the electric control circuit 20, each power supply circuit is automatically controlled, and the safety risk of arc burn caused by manual operation of the circuit breaker QF by operators is avoided.
The power control circuit and the power cabinet for the motor no-load test provided by the embodiment have the advantages that the use is convenient in the operation of the motor no-load test, the operation is simple, a user only needs to access the motor to be subjected to the no-load test into a power supply line through a cable, the protection current value is set according to the rated ampere meter of the motor nameplate, and the no-load test of the motor can be completed through inputting a starting signal. The current is prevented from being monitored continuously, the risk is high, the efficiency is low, the time is short, and the risk is high when the artificial power-off operation is carried out when the current is found to be abnormal. For a motor with high power, the circuit breaker QF is directly used for operating and transmitting power, and the starting current of the high-power motor is very large, so that the strong impact current easily damages an arc extinguishing chamber of the circuit breaker QF, the circuit breaker QF is burnt by fire, and the strong electric arc brings safety threat to operators.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (9)
1. The utility model provides a power control circuit of motor no-load test, is connected with at least one motor which characterized in that includes:
the power supply circuit comprises a first phase line, a second phase line and a third phase line, wherein the first phase line, the second phase line and the third phase line are respectively and correspondingly connected with a first phase voltage, a second phase voltage and a third phase voltage, and the power supply circuit is used for outputting an initial electric signal after the second phase voltage and the third phase voltage are subjected to voltage transformation processing and rectification processing;
at least one electric control circuit connected with the power circuit and used for conducting when receiving a starting signal and the initial electric signal so as to transmit one of the first phase voltage, the second phase voltage and the third phase voltage to the motor or switching off when receiving a protection command; and
and the monitoring circuits are connected with the electrical control circuits in a one-to-one correspondence manner and are used for generating a protection current value and outputting the protection instruction to the electrical control circuits when the current output by the electrical control circuits is monitored to be larger than the protection current value or when leakage current is detected.
2. The power supply control circuit of claim 1, wherein the power supply circuit further comprises:
circuit breakers, transformers and rectifier bridges;
the transformer comprises a primary coil and a secondary coil;
a first input end, a second input end and a third input end of the circuit breaker are respectively connected with the first phase line, the second phase line and the third phase line, and a first output end, a second output end and a third output end of the circuit breaker are respectively connected with one electric control circuit; the second output of circuit breaker with the first end of primary coil is connected, the third output of circuit breaker with the second end of primary coil is connected, the first output of secondary coil is connected the first input of rectifier bridge, the second output of secondary coil is connected the second input of rectifier bridge, the first output of rectifier bridge is connected electrical control circuit, the second output ground connection of rectifier bridge.
3. The power control circuit of claim 1, wherein the electrical control circuit comprises:
the power supply circuit, the contactor, the starting switch and the stopping switch;
the contactor comprises a winding, an auxiliary contact and a main contact;
the power supply circuit comprises a first phase line power supply circuit, a second phase line power supply circuit and a third phase line power supply circuit; the starting switch is used for receiving the starting signal, a first end of the starting switch is connected with the power circuit, a second end of the starting switch is connected with a first end of the stopping switch, a second end of the stopping switch is connected with a first end of the winding, and a second end of the winding is grounded; the auxiliary contact is bridged with the first end and the second end of the starting switch, and the main contact is connected in series with the power supply circuit.
4. The power control circuit of claim 3, wherein the monitoring circuit comprises:
the current setting potentiometer is connected with the load monitoring processor through a first current transformer, a second current transformer, a third current transformer, a fourth current transformer, a load monitoring processor and a current setting potentiometer;
the primary side of the first current transformer is connected with the first phase line power supply line, the primary side of the second current transformer is connected with the second phase line power supply line, the primary side of the third current transformer is connected with the third phase line power supply line, and the secondary side of the first current transformer, the secondary side of the second current transformer and the secondary side of the third current transformer are all connected with the load monitoring processor; the primary side of the fourth current transformer is connected with the first phase line power supply circuit, the second phase line power supply circuit and the third phase line power supply circuit, and the secondary side of the fourth current transformer is connected with the load monitoring processor; the current setting potentiometer is connected with the load monitoring processor;
the load monitoring processor comprises a normally closed switch which is connected in series with a connecting wire between the winding and the stop switch.
5. The power supply control circuit of claim 2, wherein the power supply circuit further comprises:
the power supply comprises a first power supply indicator light, a second power supply indicator light, a third power supply indicator light, a first power supply voltmeter, a second power supply voltmeter, a third power supply voltmeter, a first complete machine ammeter, a second complete machine ammeter and a third complete machine ammeter;
the first power indicator light is bridged over the first phase line and the second phase line, the second power indicator light is bridged over the second phase line and the third phase line, and the third power indicator light is bridged over the first phase line and the third phase line; the first power supply voltmeter is connected with the first power supply indicator lamp in parallel, the second power supply voltmeter is connected with the second power supply indicator lamp in parallel, and the third power supply voltmeter is connected with the third power supply indicator lamp in parallel; the first whole machine ammeter is connected in series with the first phase line, the second whole machine ammeter is connected in series with the second phase line, and the third whole machine ammeter is connected in series with the third phase line.
6. The power supply control circuit of claim 2, wherein the power supply circuit further comprises:
a first fuse, a second fuse, and a third fuse;
first fuse concatenates in first phase line, the second fuse concatenates in the second phase line, the fuse concatenates in the third phase line.
7. The power control circuit of claim 3, wherein the electrical control circuit further comprises:
a first load ammeter, a second load ammeter and a third load ammeter;
the first load ammeter is connected in series with the first phase line power supply circuit, the second load ammeter is connected in series with the second phase line power supply circuit, and the third load ammeter is connected in series with the third phase line power supply circuit.
8. The power control circuit of claim 3, wherein the electrical control circuit further comprises:
and the load on-load indicator lamp is connected with the winding of the contactor in parallel.
9. A power cabinet, comprising:
the power supply control circuit of any one of claims 1 to 8; and
and the cabinet body is used for packaging the power supply control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021555478.8U CN213151719U (en) | 2020-07-30 | 2020-07-30 | Power supply control circuit and power supply cabinet for motor no-load test |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021555478.8U CN213151719U (en) | 2020-07-30 | 2020-07-30 | Power supply control circuit and power supply cabinet for motor no-load test |
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| CN213151719U true CN213151719U (en) | 2021-05-07 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113775551A (en) * | 2021-09-22 | 2021-12-10 | 中船黄埔文冲船舶有限公司 | Portable test tool, test detection method and device for pipeline fan |
| CN113870541A (en) * | 2021-09-22 | 2021-12-31 | 广东电网有限责任公司 | Low-voltage system operation experimental method and device |
| CN115561629A (en) * | 2022-09-16 | 2023-01-03 | 中核检修有限公司 | Portable motor no-load test device |
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2020
- 2020-07-30 CN CN202021555478.8U patent/CN213151719U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113775551A (en) * | 2021-09-22 | 2021-12-10 | 中船黄埔文冲船舶有限公司 | Portable test tool, test detection method and device for pipeline fan |
| CN113870541A (en) * | 2021-09-22 | 2021-12-31 | 广东电网有限责任公司 | Low-voltage system operation experimental method and device |
| CN113870541B (en) * | 2021-09-22 | 2023-08-01 | 广东电网有限责任公司 | Low-voltage system operation experiment method and device |
| CN113775551B (en) * | 2021-09-22 | 2024-03-26 | 中船黄埔文冲船舶有限公司 | Portable test tool, test detection method and device for pipeline fan |
| CN115561629A (en) * | 2022-09-16 | 2023-01-03 | 中核检修有限公司 | Portable motor no-load test device |
| CN115561629B (en) * | 2022-09-16 | 2023-09-01 | 中核检修有限公司 | Portable motor no-load test device |
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