CN212872676U - Phase sequence recognition device for phase change switch power supply - Google Patents
Phase sequence recognition device for phase change switch power supply Download PDFInfo
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- CN212872676U CN212872676U CN202021179449.6U CN202021179449U CN212872676U CN 212872676 U CN212872676 U CN 212872676U CN 202021179449 U CN202021179449 U CN 202021179449U CN 212872676 U CN212872676 U CN 212872676U
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Abstract
The utility model relates to a phase sequence recognition device for phase change switch power supply, which comprises a power supply circuit, a master control circuit, an acquisition circuit and a first phase sequence recognition circuit; the power supply circuit is respectively electrically connected with the main control circuit, the acquisition circuit and the first phase sequence identification circuit, the first phase sequence identification circuit is respectively electrically connected with the main control circuit and the acquisition circuit, the power supply circuit is electrically connected with an external power supply, and the acquisition circuit is respectively electrically connected with a three-phase input end and a load output end of the commutation switch. The utility model discloses can in time judge the true power supply phase sequence of load side effectively under the load side live wire condition of commutation switch, when the commutation switch carries out the load to the user side and switches over, can discern the power supply phase sequence of load output side in real time and accurately simultaneously, greatly improve the work efficiency and the commutation effect of commutation switch, effectively guarantee transmission line's unbalanced three phase and administer the level.
Description
Technical Field
The utility model relates to an electric power product technical field, in particular to commutation switch supplies power phase sequence recognition device.
Background
In the field of power industry, the unbalanced three-phase problem of a power transmission line is more prominent, and the phase change switch can effectively solve the unbalanced three-phase problem, so that the user side is subjected to phase change to achieve balanced three-phase operation. The phase change switch can solve the problem of line loss caused by three-phase imbalance, and if the phase change action of the phase change switch fails, the treatment effect of the three-phase imbalance is possibly poor. Therefore, the power supply phase sequence of the phase change switch in the phase change process is identified, and the method has important significance in treating three-phase imbalance.
At present, the phase sequence identification device in the power enterprise has the following defects:
1. the phase sequence recognition means in the case of a load-side electrification are missing. The traditional phase sequence identification and power loss detection only aim at detecting an A phase, a B phase, a C phase and an N phase, and three phases of electricity and N lines are compared, so that the phase sequence and the phase loss fault of the A phase, the B phase and the C phase are judged; however, because the phase change switch introduces the L phase at the load side, it is necessary to determine whether the phase angles of the a phase, the B phase, the C phase and the L phase are consistent, because the L phase has a strong current of 220V for a long time, and there is a great difference from the conventional N phase zero voltage, which greatly increases the detection difficulty, however, there is no device in the market that can accurately determine the phase sequence of the power supply under the condition that the load end is electrified.
2. The accuracy of phase sequence identification is low. When the commutation switch is in commutation operation, the commutation switch is usually controlled by a CPU in the commutation switch, and once a fault occurs, the accuracy of a commutation phase sequence is difficult to judge.
3. The real-time performance of phase sequence identification is poor. The phase change switch indicates the phase sequence only when the phase change operation is performed, and is mainly responsible for collecting line current when the relevant operation is not performed, the power supply phase sequence cannot be detected in real time, and when the phase change switch changes the phase sequence according to the instruction of an internal CPU, the change state of the phase sequence cannot be identified in real time.
Therefore, there is a need in the market for a device that can accurately identify the phase sequence of the power supply on the load side in real time when the load side of the commutation switch is charged.
SUMMERY OF THE UTILITY MODEL
The utility model provides a commutation switch power supply phase sequence recognition device has solved among the prior art can't be under the load side live condition of commutation switch, the technical problem of the power supply phase sequence of real-time, accurately discerning commutation switch load side.
The utility model provides an above-mentioned technical problem's technical scheme as follows:
a phase sequence recognition device for phase change switch power supply comprises a power supply circuit, a master control circuit, an acquisition circuit and a first phase sequence recognition circuit;
the power supply circuit is respectively electrically connected with the main control circuit, the acquisition circuit and the first phase sequence identification circuit, the first phase sequence identification circuit is respectively electrically connected with the main control circuit and the acquisition circuit, the power supply circuit is electrically connected with an external power supply, and the acquisition circuit is respectively electrically connected with a three-phase input end and a load output end of the commutation switch.
The utility model has the advantages that: the power supply circuit supplies power to the main control circuit, the acquisition circuit and the first phase sequence identification circuit, so that each circuit in the phase change switch power supply phase sequence identification device can normally operate; the acquisition circuit is respectively electrically connected with the three-phase input end and the load output end of the phase change switch, and phase signals (namely phase signals of A phase, B phase and C phase) of each input side of the phase change switch and phase signals (namely phase signals of L phase) of the load output side can be respectively acquired through the acquisition circuit; comparing the phase signals of the input sides with the phase signals of the load output sides through a first phase sequence identification circuit, and obtaining the real power supply phase sequence of the load side of the phase change switch through a main control device according to the compared result; wherein the phase signal comprises a voltage phase and a current phase;
the utility model discloses a commutation switch power supply phase sequence recognition device, compare with the mode of traditional three-phase electricity and N line contrast, can in time judge the true power supply phase sequence of load side effectively under the load side live wire condition of commutation switch, simultaneously when the commutation switch carries out the load to the user side and switches, can accurately discern the power supply phase sequence of load output side in real time, in each links such as research and development of commutation switch, production, implementation, can greatly improve the work efficiency and the commutation effect of commutation switch, further guarantee transmission line's the unbalanced three-phase and administer the level.
On the basis of the technical scheme, the utility model discloses there is following improvement in addition:
further: the power supply circuit comprises a switching power supply and a power supply interface sub-circuit;
the power supply interface sub-circuit is respectively electrically connected with the switching power supply and the power supply, and the switching power supply is respectively electrically connected with the main control circuit, the acquisition circuit and the first phase sequence identification circuit.
The beneficial effects of the further technical scheme are as follows: through the power interface sub-circuit, the external mains supply or the storage battery power supply can be conveniently accessed, the mains supply or the storage battery power supply can be converted into high-quality direct-current voltage meeting the equipment requirements through the switch power supply, and power is supplied to each module circuit in the device.
Further: the acquisition circuit comprises a load side acquisition sub-circuit and three power transmission side acquisition sub-circuits;
the load side acquisition sub-circuit and the three power transmission side acquisition sub-circuits are respectively and electrically connected with the first phase sequence identification circuit, the load side acquisition sub-circuit and the three power transmission side acquisition sub-circuits are also respectively and electrically connected with the switching power supply, the load side acquisition sub-circuit is electrically connected with the load output end of the phase change switch, and the three power transmission side acquisition sub-circuits are electrically connected with the three-phase input ends of the phase change switch in a one-to-one correspondence manner; the three power transmission side acquisition sub-circuits are respectively an A-phase acquisition sub-circuit, a B-phase acquisition sub-circuit and a C-phase acquisition sub-circuit.
The beneficial effects of the further technical scheme are as follows: the three-phase input sides of the phase change switch are respectively an A-phase input side, a B-phase input side and a C-phase input side, phase signals of the three-phase input sides are respectively collected through the three-path power transmission side collecting sub-circuit, then phase signals of the load output end (namely the load side) of the phase change switch are collected through the load side collecting sub-circuit, the phase signals can be the voltage phase and the current phase, the phase signals can be processed and compared with the phase signals of the load side through the first phase sequence recognition circuit, and therefore the real power supply phase sequence of the phase change switch can be accurately recognized under the condition that the load side is electrified.
Further: the first phase sequence identification circuit comprises four sensors and four analog operational amplifiers;
all the sensors are respectively and electrically connected with the switching power supply, all the sensors are also electrically connected with all the analog operational amplifiers in a one-to-one corresponding manner, wherein three paths of the sensors are also electrically connected with the phase A acquisition sub-circuit, the phase B acquisition sub-circuit and the phase C acquisition sub-circuit in a one-to-one corresponding manner, and the rest path of the sensors are also electrically connected with the load side acquisition sub-circuit; all the analog operational amplifiers are respectively electrically connected with the main control circuit;
the sensor is an A-phase sensor, the sensor is a B-phase sensor, the sensor is a C-phase sensor, the sensor is electrically connected with the C-phase acquisition sub-circuit in a one-to-one correspondence manner, and the sensor is an L-phase sensor.
The beneficial effects of the further technical scheme are as follows: because the input side and the load output side share four paths of data, the four-path sensor and the four-path analog operational amplifier are arranged, so that the phase signals of each path can be processed respectively, and the identification of the power supply phase sequence can be realized under the condition that the load side is electrified; the phase signals acquired at the input side of each path are strong current signals, so that the acquisition sub-circuit at the power transmission side of each path is respectively connected with a sensor, the strong current signals acquired at the input side of each path can be converted into weak current signals, and then the signals are subjected to precise operational amplification through the analog operational amplifier corresponding to each path, so that zero drift can be reduced, the signals can be conveniently and directly provided for the main control circuit to compare and judge the power supply phase sequence at the load side, and the identification accuracy is high; wherein, master control circuit directly judges the power supply phase sequence according to the data of four ways simulation fortune putting ware output and carries out for the built-in computer program of master control circuit, and this computer program is prior art, the utility model discloses do not relate to the improvement to this computer program.
Further: the first phase sequence identification circuit 4 further comprises three digital comparators 43, wherein the three digital comparators 43 are an AL-phase digital comparator, a BL-phase digital comparator and a CL-phase digital comparator respectively;
AL looks digital comparator respectively with A looks sensor with L looks sensor electricity is connected, BL looks digital comparator respectively with B looks sensor with L looks sensor electricity is connected, CL looks digital comparator respectively with C looks sensor with L looks sensor electricity is connected, AL looks digital comparator BL looks digital comparator with CL looks digital comparator still equally divide respectively with master control circuit 2 electricity is connected.
The beneficial effects of the further technical scheme are as follows: comparing an A-phase signal converted by an A-phase sensor with an L-phase signal converted by an L-phase sensor through an AL-phase digital comparator, comparing a B-phase signal converted by a B-phase sensor with an L-phase signal converted by the L-phase sensor through a BL-phase digital comparator, comparing a C-phase signal converted by a C-phase sensor with an L-phase signal converted by the L-phase sensor through a C-phase L-phase digital comparator, comparing the phase difference of each input-side phase signal with the phase signal of a load side through a pure hardware method, and when the phase difference exists, generating pulse signals of corresponding high and low levels by the corresponding digital comparator, and further accurately identifying the power supply phase sequence of the load side through main control of a circuit; on the basis of directly judging the power supply phase sequence through the main control circuit, the phase is compared through the digital comparator, so that the accuracy of the whole phase sequence identification device can be further improved, and the identification precision is improved.
Further: a second phase sequence identification circuit;
the load side acquisition sub-circuit and the three power transmission side acquisition sub-circuits are also respectively electrically connected with the second phase sequence identification circuit, and the second phase sequence identification circuit is respectively electrically connected with the main control circuit and the switching power supply.
The beneficial effects of the further technical scheme are as follows: the phase signal of each phase input side is directly compared and judged with the phase signal of the load side through the second phase sequence identification circuit, so that the identification accuracy of the phase sequence can be further improved on the basis of the first phase sequence identification circuit, and the non-negligible error generated in the first phase sequence identification circuit is avoided.
Further: the second phase sequence identification circuit comprises three indicator lights and three relays, the three indicator lights are respectively an AL phase indicator light, a BL phase indicator light and a CL phase indicator light, and the three relays are respectively an AL sequential electric appliance, a BL sequential electric appliance and a CL sequential electric appliance;
AL looks pilot lamp respectively with AL electrical apparatus in succession A looks collection sub-circuit with load side gathers the sub-circuit electricity and connects, BL looks pilot lamp respectively with BL electrical apparatus in succession B looks collection sub-circuit with load side gathers the sub-circuit electricity and connects, CL looks pilot lamp respectively with CL electrical apparatus in succession C looks collection sub-circuit with load side gathers the sub-circuit electricity and connects, AL looks pilot lamp BL looks pilot lamp CL looks pilot lamp AL looks electrical apparatus in succession the BL electrical apparatus in succession and CL electrical apparatus in succession equallys divide do not with the master control circuit electricity is connected.
The beneficial effects of the further technical scheme are as follows: respectively inputting the signal data acquired by each input side acquisition sub-circuit and the signal data acquired by each load side acquisition sub-circuit into corresponding indicator light loops, for example, respectively connecting the A-phase acquisition sub-circuit and the load side acquisition sub-circuit to two ends of an AL-phase indicator light, and forming the AL-phase indicator light loop with an AL sequential electric appliance and a main control circuit, wherein when the AL sequential electric appliance is controlled to be attracted by the main control circuit, if the phase sequence of the A-phase acquisition sub-circuit and the phase sequence of the load side acquisition sub-circuit (namely the L-phase acquisition sub-circuit) are the same, the phases at two ends of the AL-phase indicator light are the same, the two ends of the indicator light have no pressure difference, and no current flows through the indicator light and is in a non-bright state; when the phase sequence of the A-phase acquisition sub-circuit is the same as that of the L-phase acquisition sub-circuit, the phases of two ends of the AL-phase indicator lamp are different, the two ends of the indicator lamp have pressure difference, and current flows through the indicator lamp to be in a high-brightness state; the phase B and the phase C are respectively in the same way as an indicator light loop formed by the phase L acquisition sub-circuit; the corresponding indicator light loop is controlled by the relay, so that the normal operation and display of the indicator light can be ensured, and the corresponding load side power supply phase sequence can be identified directly according to the display result of the indicator light; through pilot lamp and relay, combine master control circuit, can further discern the power supply phase sequence with pure hardware circuit's mode, further improve the rate of accuracy of phase sequence discernment.
Further: the second phase sequence identification circuit further comprises three optical couplers which are respectively an AL-phase optical coupler, a BL-phase optical coupler and a CL-phase optical coupler;
the AL looks opto-coupler with the AL looks pilot lamp electricity is connected, the BL looks opto-coupler with the BL looks pilot lamp electricity is connected, the CL looks opto-coupler with the CL looks pilot lamp electricity is connected, the AL looks opto-coupler the BL looks opto-coupler with the CL looks opto-coupler equally divide respectively with the master control circuit electricity is connected.
The beneficial effects of the further technical scheme are as follows: in three different indicator light loops, one optical coupler is respectively connected to an AL phase indicator light and an AL phase electric appliance in sequence, and a display signal of the indicator light is detected through the optical coupler, for example, when the indicator light judges that the phase sequence of an a phase input side is the same as that of an L phase load side, no current passes through the indicator light (the AL phase indicator light is not bright) and a primary side of the optical coupler, a secondary side of the optical coupler is disconnected, a low level state is output, the low level state is fed back to a main control circuit, correct phase sequence identification can be further fed back, otherwise, the secondary side of the optical coupler is closed, a high level is output, and wrong phase sequence identification can be fed back; the principle of the BL phase loop and the principle of the CL phase loop are the same; through the three paths of optical couplers, corresponding three paths of closed-loop feedback circuits can be formed, on one hand, the accuracy of phase sequence identification can be further improved, and on the other hand, the purpose of self-checking of the main control circuit can be achieved.
Further: the device also comprises a key display circuit;
the key display circuit is electrically connected with the main control circuit.
The beneficial effects of the further technical scheme are as follows: through the key display circuit, the on-off of phase sequence identification can be realized through operating keys, the selection of several identification modes in the phase sequence identification process can be realized, the phase sequence identification result, the phase data and the historical data in the historical identification process can be displayed in real time through a display screen, a user can conveniently perform big data analysis according to the displayed data, and the management condition of the power quality of the power transmission line is evaluated.
Further: the main control circuit specifically comprises an STM32F103RCT6 type single chip microcomputer.
The beneficial effects of the further technical scheme are as follows: the singlechip of this model adopts CORTEX M3 kernel, possesses 256K's FLASH and 48K's RAM, can improve the four ways AD acquisition channel that satisfies the requirement through this singlechip, and 3 way digital comparison GPIO mouths, 3 way pilot lamp relay control and 3 way optical coupling feedback GPIO mouths can also increase partial button and display port in addition, and then satisfy the utility model discloses well commutation switch power supply phase sequence recognition device's technical requirement.
Drawings
Fig. 1 is an installation model diagram of a phase sequence identification device for phase change switch power supply in the embodiment of the present invention;
fig. 2 is a schematic structural diagram of a phase sequence identification device for power supply of a phase change switch in an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a power supply circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of the acquisition circuit and the first phase sequence identification circuit in the embodiment of the present invention;
fig. 5 is a schematic structural diagram of another phase sequence identification device for power supply of a phase change switch according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a second phase sequence identification circuit according to an embodiment of the present invention;
fig. 7 is a specific circuit diagram of the power supply circuit according to the embodiment of the present invention;
fig. 8 is a specific circuit layout diagram of the a-phase acquisition sub-circuit of the acquisition circuit in the embodiment of the present invention;
fig. 9 is a specific circuit layout diagram of an AL phase digital comparator of the first phase sequence identification circuit according to the embodiment of the present invention;
fig. 10 is a specific circuit diagram of a second phase sequence identification circuit according to an embodiment of the present invention;
fig. 11 is a specific circuit diagram of the key display circuit according to the embodiment of the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1. the device comprises a power supply circuit, a main control circuit, a collecting circuit, a first phase sequence identification circuit, a second phase sequence identification circuit, a key display circuit, a switch power supply, a power interface sub-circuit, a load side collecting sub-circuit, an input side collecting sub-circuit, a power supply circuit, a key display circuit, a switch power supply 12, a power interface sub-circuit, a load side collecting sub-circuit, a sensor, a.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
The present invention will be described with reference to the accompanying drawings.
In an embodiment, as shown in fig. 2, a phase sequence identification device for a phase change switch power supply includes a power supply circuit 1, a main control circuit 2, an acquisition circuit 3, and a first phase sequence identification circuit 4;
the power supply circuit 1 is respectively connected with the main control circuit 2, the acquisition circuit 3 and the first phase sequence identification circuit 4, the first phase sequence identification circuit 4 is respectively connected with the main control circuit 2 and the acquisition circuit 3, the power supply circuit 1 is electrically connected with an external power supply, and the acquisition circuit 3 is respectively electrically connected with a three-phase input end and a load output end of the commutation switch.
The working principle of the phase sequence identification device for phase change switch power supply of the embodiment is as follows:
the power supply circuit supplies power to the main control circuit, the acquisition circuit and the first phase sequence identification circuit, so that each circuit in the phase change switch power supply phase sequence identification device can normally operate; the acquisition circuit is respectively electrically connected with the three-phase input end and the load output end of the phase change switch, and phase signals (namely phase signals of A phase, B phase and C phase) of each input side of the phase change switch and phase signals (namely phase signals of L phase) of the load output side can be respectively acquired through the acquisition circuit; comparing the phase signals of the input sides with the phase signals of the load output sides through a first phase sequence identification circuit, and obtaining the real power supply phase sequence of the load side of the phase change switch through a main control device according to the compared result; wherein the phase signal includes a voltage phase and a current phase.
The utility model discloses a commutation switch power supply phase sequence recognition device, compare with the mode of traditional three-phase electricity and N line contrast, can in time judge the true power supply phase sequence of load side effectively under the load side live wire condition of commutation switch, simultaneously when the commutation switch carries out the load to the user side and switches, can accurately discern the power supply phase sequence of load output side in real time, in each links such as research and development of commutation switch, production, implementation, can greatly improve the work efficiency and the commutation effect of commutation switch, further guarantee transmission line's the unbalanced three-phase and administer the level.
Specifically, the installation connection model diagram of the commutation switch power supply phase sequence recognition device and the commutation switch of the present embodiment is shown in fig. 1, where the input side and the user side of the commutation switch both have strong electricity for a long time, and the commutation switch power supply phase sequence recognition device is installed at both the input and output ends of the commutation switch, and is respectively connected to the three-phase input end (phase a input end, phase B input end, phase C input end) and the load output end (phase L output end) of the commutation switch.
Preferably, as shown in fig. 3, the power supply circuit 1 includes a switching power supply 11 and a power supply interface sub-circuit 12;
the power interface sub-circuit 12 is respectively electrically connected with the switching power supply 11 and the power supply, and the switching power supply 11 is respectively electrically connected with the main control circuit 2, the acquisition circuit 3 and the first phase sequence identification circuit 4.
Through the power interface sub-circuit, the external mains supply or the storage battery power supply can be conveniently accessed, the mains supply or the storage battery power supply can be converted into high-quality direct-current voltage meeting the equipment requirements through the switch power supply, and power is supplied to each module circuit in the device.
Preferably, as shown in fig. 4, the acquisition circuit 3 includes a load-side acquisition sub-circuit 31 and a three-way transmission-side acquisition sub-circuit 32;
the load side collecting sub-circuit 31 and the three power transmission side collecting sub-circuits 32 are respectively electrically connected with the first phase sequence identification circuit 4, the load side collecting sub-circuit 31 and the three power transmission side collecting sub-circuits 32 are also respectively electrically connected with the switching power supply 11, the load side collecting sub-circuit 31 is electrically connected with a load output end of the phase change switch, and the three power transmission side collecting sub-circuits 32 are electrically connected with three phase input ends of the phase change switch in a one-to-one correspondence manner; the three power transmission side acquisition sub-circuits 32 are respectively an a-phase acquisition sub-circuit, a B-phase acquisition sub-circuit and a C-phase acquisition sub-circuit.
The three-phase input sides of the phase change switch are respectively an A-phase input side, a B-phase input side and a C-phase input side, phase signals of the three-phase input sides are respectively collected through the three-path power transmission side collecting sub-circuit, then phase signals of the load output end (namely the load side) of the phase change switch are collected through the load side collecting sub-circuit, the phase signals can be the voltage phase and the current phase, the phase signals can be processed and compared with the phase signals of the load side through the first phase sequence recognition circuit, and therefore the real power supply phase sequence of the phase change switch can be accurately recognized under the condition that the load side is electrified.
Preferably, as shown in fig. 4, the first phase sequence identification circuit 4 includes a four-way sensor 41 and a four-way analog op amp 42;
all the sensors 41 are respectively electrically connected with the switching power supply 11, all the sensors 41 are further electrically connected with all the analog operational amplifiers 42 in a one-to-one correspondence manner, wherein three paths of the sensors 41 are further electrically connected with the phase a acquisition sub-circuit, the phase B acquisition sub-circuit and the phase C acquisition sub-circuit in a one-to-one correspondence manner, and the remaining path of the sensors 41 is further electrically connected with the load side acquisition sub-circuit 31; all the analog operational amplifiers 42 are respectively electrically connected with the main control circuit 2;
the sensors 41 electrically connected to the a-phase acquisition sub-circuit in a one-to-one correspondence are a phase a sensor, the sensors 41 electrically connected to the B-phase acquisition sub-circuit in a one-to-one correspondence are a phase B sensor, the sensors 41 electrically connected to the C-phase acquisition sub-circuit in a one-to-one correspondence are a phase C sensor, and the sensors 41 electrically connected to the load side acquisition sub-circuit 31 are an phase L sensor.
Because the input side and the load output side share four paths of data, the four-path sensor and the four-path analog operational amplifier are arranged, so that the phase signals of each path can be processed respectively, and the identification of the power supply phase sequence can be realized under the condition that the load side is electrified; the phase signals acquired at the input side of each path are strong current signals, so that the acquisition sub-circuit at the power transmission side of each path is respectively connected with a sensor, the strong current signals acquired at the input side of each path can be converted into weak current signals, and then the signals are subjected to precise operational amplification through the analog operational amplifier corresponding to each path, so that zero drift can be reduced, the signals can be conveniently and directly provided for the main control circuit to compare and judge the power supply phase sequence at the load side, and the identification accuracy is high; wherein, master control circuit directly judges the power supply phase sequence according to the data of four ways simulation fortune putting ware output and carries out for the built-in computer program of master control circuit, and this computer program is prior art, the utility model discloses do not relate to the improvement to this computer program.
Preferably, as shown in fig. 4, the first phase sequence identification circuit 4 further includes three digital comparators 43, where the three digital comparators 43 are an AL-phase digital comparator, a BL-phase digital comparator, and a CL-phase digital comparator, respectively;
AL looks digital comparator respectively with A looks sensor with L looks sensor electricity is connected, BL looks digital comparator respectively with B looks sensor with L looks sensor electricity is connected, CL looks digital comparator respectively with C looks sensor with L looks sensor electricity is connected, AL looks digital comparator BL looks digital comparator with CL looks digital comparator still equally divide respectively with master control circuit 2 electricity is connected.
The phase difference detection method comprises the following steps that A-phase signals converted by an A-phase sensor and L-phase signals converted by an L-phase sensor are compared through an AL-phase digital comparator, B-phase signals converted by a B-phase sensor and L-phase signals converted by the L-phase sensor are compared through a BL-phase digital comparator, C-phase signals converted by a C-phase sensor and L-phase signals converted by the L-phase sensor are compared through a CL-phase digital comparator, the phase difference between each input-side phase signal and the load-side phase signal is compared through a pure hardware method, when the phase difference exists, the corresponding digital comparator generates corresponding high-low level pulse signals, and the power supply phase sequence of the load side can be accurately identified through main control of a circuit; on the basis of directly judging the power supply phase sequence through the main control circuit, the phase is compared through the digital comparator, so that the accuracy of the whole phase sequence identification device can be further improved, and the identification precision is improved.
Preferably, as shown in fig. 5, a second phase sequence identification circuit 5 is further included;
the load side acquisition sub-circuit 31 and the three power transmission side acquisition sub-circuits 32 are also electrically connected to the second phase sequence identification circuit 5, and the second phase sequence identification circuit 5 is electrically connected to the main control circuit 2 and the switching power supply 11.
The phase signal of each phase input side is directly compared and judged with the phase signal of the load side through the second phase sequence identification circuit, so that the identification accuracy of the phase sequence can be further improved on the basis of the first phase sequence identification circuit, and the non-negligible error generated in the first phase sequence identification circuit is avoided.
Preferably, as shown in fig. 6, the second phase sequence identification circuit 5 comprises three indicator lights 51 and three relays 52, wherein the three indicator lights 51 are respectively an AL phase indicator light, a BL phase indicator light and a CL phase indicator light, and the three relays 52 are respectively an AL sequential electric appliance, a BL sequential electric appliance and a CL sequential electric appliance;
AL looks pilot lamp respectively with AL is in succession the electrical apparatus the sub-circuit is gathered with A looks acquisition sub-circuit 31 electricity is connected to the load side, BL looks pilot lamp respectively with BL is in succession the electrical apparatus B looks acquisition sub-circuit with the sub-circuit 31 electricity is gathered to the load side is connected, CL looks pilot lamp respectively with CL is in succession the electrical apparatus C looks acquisition sub-circuit with the sub-circuit 31 electricity is gathered to the load side is connected, AL looks pilot lamp BL looks pilot lamp CL looks pilot lamp AL is in succession the electrical apparatus BL is in succession the electrical apparatus and CL is in succession the electrical apparatus equally divide respectively with master control circuit 2 electricity is connected.
Respectively inputting the signal data acquired by each input side acquisition sub-circuit and the signal data acquired by each load side acquisition sub-circuit into corresponding indicator light loops, for example, respectively connecting the A-phase acquisition sub-circuit and the load side acquisition sub-circuit to two ends of an AL-phase indicator light, and forming the AL-phase indicator light loop with an AL sequential electric appliance and a main control circuit, wherein when the AL sequential electric appliance is controlled to be attracted by the main control circuit, if the phase sequence of the A-phase acquisition sub-circuit and the phase sequence of the load side acquisition sub-circuit (namely the L-phase acquisition sub-circuit) are the same, the phases at two ends of the AL-phase indicator light are the same, the two ends of the indicator light have no pressure difference, and no current flows through the indicator light and is in a non-bright state; when the phase sequence of the A-phase acquisition sub-circuit is the same as that of the L-phase acquisition sub-circuit, the phases of two ends of the AL-phase indicator lamp are different, the two ends of the indicator lamp have pressure difference, and current flows through the indicator lamp to be in a high-brightness state; the phase B and the phase C are respectively in the same way as an indicator light loop formed by the phase L acquisition sub-circuit; the corresponding indicator light loop is controlled by the relay, so that the normal operation and display of the indicator light can be ensured, and the corresponding load side power supply phase sequence can be identified directly according to the display result of the indicator light; through pilot lamp and relay, combine master control circuit, can further discern the power supply phase sequence with pure hardware circuit's mode, further improve the rate of accuracy of phase sequence discernment.
Preferably, as shown in fig. 6, the second phase sequence identification circuit 5 further includes three optical couplers 53, where the three optical couplers 53 are an AL-phase optical coupler, a BL-phase optical coupler, and a CL-phase optical coupler, respectively;
the AL looks opto-coupler with the AL looks pilot lamp electricity is connected, the BL looks opto-coupler with the BL looks pilot lamp electricity is connected, the CL looks opto-coupler with the CL looks pilot lamp electricity is connected, the AL looks opto-coupler the BL looks opto-coupler with the CL looks opto-coupler equally divide respectively with 2 electricity of master control circuit are connected.
In three different indicator light loops, one optical coupler is respectively connected to an AL phase indicator light and an AL phase electric appliance in sequence, and a display signal of the indicator light is detected through the optical coupler, for example, when the indicator light judges that the phase sequence of an a phase input side is the same as that of an L phase load side, no current passes through the indicator light (the AL phase indicator light is not bright) and a primary side of the optical coupler, a secondary side of the optical coupler is disconnected, a low level state is output, the low level state is fed back to a main control circuit, correct phase sequence identification can be further fed back, otherwise, the secondary side of the optical coupler is closed, a high level is output, and wrong phase sequence identification can be fed back; the principle of the BL phase loop and the principle of the CL phase loop are the same; through the three paths of optical couplers, corresponding three paths of closed-loop feedback circuits can be formed, on one hand, the accuracy of phase sequence identification can be further improved, and on the other hand, the purpose of self-checking of the main control circuit can be achieved.
Preferably, as shown in fig. 5, a key display circuit 6 is further included;
the key display circuit 6 is electrically connected with the main control circuit 2.
Through the key display circuit, the on-off of phase sequence identification can be realized through operating keys, the selection of several identification modes in the phase sequence identification process can be realized, the phase sequence identification result, the phase data and the historical data in the historical identification process can be displayed in real time through a display screen, a user can conveniently perform big data analysis according to the displayed data, and the management condition of the power quality of the power transmission line is evaluated.
Specifically, the main control circuit in this embodiment specifically includes a single chip microcomputer of the STM32F103RCT6 model.
The single chip Microcomputer (MCU) of the type adopts CORTEX M3 inner core, has FLASH of 256K and RAM of 48K, can improve the four-way AD acquisition channel meeting the requirement through the single chip microcomputer, 3-way digital comparison GPIO port, 3-way pilot lamp relay control and 3-way optical coupling feedback GPIO port, and then can realize triple phase sequence identification; the first heavy phase sequence identification is that the power supply phase sequence is directly identified by the main control circuit in the first phase sequence identification circuit according to data provided by the analog operational amplifier; the second phase sequence identification is that the power supply phase sequence is identified by the level signal which is compared by the digital comparator in the first phase sequence identification circuit; the third phase sequence identification and closed loop feedback are that the power supply phase sequence and signal feedback are identified by the display condition of the indicator light and the level signal fed back by the optical coupler in the second phase sequence identification circuit; in addition, partial keys and display ports can be added, so that the on-off of phase sequence identification and result display are realized; can satisfy through above-mentioned singlechip the utility model discloses well commutation switch supplies power phase sequence recognition device's technical requirement.
Specifically, a specific circuit diagram of the power supply circuit in the present embodiment is shown in fig. 7. In fig. 7, a 12V power supply is introduced, the MCU and the related chip circuits both need 3.3V, the switching power supply specifically uses a P3596L model DC/DC chip, and the circuit design from 12V to 3.3V is completed, because VCC _12V is supplied by a storage battery, the maximum voltage of the storage battery is 14.6V, and the maximum input voltage of P3596L is 45V, and the voltage is divided by R1 and R3, and the output voltage V0 = 1.23(1+ R43/R42) = 3.28V, but the front end uses a TVS leakage energy model 1.5KE39A for preventing interference of the input power supply, the operating voltage is 37V, when the interference voltage exceeds 37V, the TVS operates, the leakage current can reach 143A at maximum, far exceeds the rated operating current of fuse F1 by 0.5A, the fuse F1 will be blown quickly, the rear-stage circuit is protected, the tvm of the rear-stage circuit is 33.3V, the maximum leakage current of the TVS is 33.3V, and the input voltage of the input is 16 uv, the circuit requirements are met.
Specifically, in the present embodiment, the load-side acquisition sub-circuit is identical to the three-way input-side acquisition sub-circuit, and taking the a-phase acquisition sub-circuit in the input-side acquisition sub-circuit as an example, a specific circuit diagram thereof is shown in fig. 8, an AD acquisition voltage range of the MCU is 0 to 3V, so that the input sampling voltage cannot be higher than 3V. The phase voltage is 220V, the redundancy design is 20%, the upper limit voltage is 264V, a voltage converter T4 is adopted in the voltage converter in the figure 8, the specification is 300V/3V, the voltage converter is reduced by two times through rear proportional resistors R29 and R31 and then input into 3VAC, the rear end of the voltage converter is 1.5VAC, the voltage converter is raised to be 1.5V, and the collection voltage range is controlled to be 0-3V. The voltage converter integrates the sampling resistor inside the mutual inductor, so that the temperature drift is small and the precision is high. Fig. 8 shows only the phase a acquisition sub-circuit, and the phase B acquisition sub-circuit, the phase C acquisition sub-circuit, and the load side acquisition sub-circuit are similar and will not be described herein again.
Specifically, because each strong voltage analog quantity is controlled to be 0-3V by each sensor, three LM393 digital comparators are adopted to compare the small-signal voltages of the signals output by the phase a sensor and the phase L sensor, the phase B sensor and the phase L sensor, and the phase C sensor and the phase L sensor, respectively, and the three digital comparators in the embodiment are identical, and the specific circuit diagram is shown in fig. 9 by taking the phase AL digital comparator as an example. In fig. 9, in order to ensure the stability of the small signal, a voltage follower is added to the front-end pin of the access comparator, so that the digital signal is prevented from interfering the acquisition of the analog signal, and a certain isolation effect is achieved. When the phase A is the same as the phase L, the comparator will continuously output low level, the MCU detects the low level and can judge that the phase L is the same as the phase A and the power supply phase sequence of the phase L is the phase A, otherwise, when the phase A is different from the phase L, the comparator will output high-low alternating pulse signals due to the characteristics of the voltage sinusoidal signals, and the MCU detects the characteristic signals and can judge that the phase L is different from the phase A and exclude the condition that the phase A is the power supply phase sequence of the phase L. The comparison principle of other phases B and L, and C and L is the same, fig. 9 only shows the AL phase digital comparator, and the specific circuits of the BL phase digital comparator and the CL phase digital comparator are similar, and are not described herein again.
Specifically, in this embodiment, the three-way indicator lamp of the second phase sequence recognition circuit is an ac indicator lamp, and is connected with the a-phase acquisition sub-circuit and the L-phase acquisition sub-circuit (i.e., the load-side acquisition sub-circuit), the B-phase acquisition sub-circuit and the L-phase acquisition sub-circuit, the C-phase acquisition sub-circuit and the L-phase acquisition sub-circuit respectively, the contact of the relay is connected in series in the indicator lamp loop, thereby MCU controls the contact switch of the relay to control the on-state of the indicator lamp, and the optocoupler is connected in series with the indicator lamp to further feed back the phase sequence recognition result signal recognized by the indicator lamp. The three indicator light circuits in this embodiment are identical, and a specific circuit diagram of the indicator light circuit in the AL phase is shown in fig. 10 as an example. In fig. 10, when the relay is controlled to be closed by the MCU, the voltage difference is zero because the strong electric phase sequences at the two ends of the indicator light are the same, and the indicator light is off, otherwise the indicator light will be highlighted, prompting the user that the phase is not the load side power supply phase; when the phase sequences of the two ends of the indicator light are the same, the voltage difference is zero, no current flows through the primary side of the optocoupler, the secondary triode cannot be conducted, the output of the phase sequence optocoupler is low level, the MCU can detect the level and detect the detection result of the indicator light, when the phase sequences of the two ends of the indicator light are different, the voltage difference exists, the current flows through the primary side of the optocoupler, the secondary triode is conducted, the output of the phase sequence optocoupler is high level, and the MCU also detects the level so as to judge the detection result of the indicator light; the relay is JCZ-32FCZ05DC12V0.45, and the optocoupler is PC 814A. The other phases B and L, and phases C and L have the same principle, fig. 10 only shows the indicator light loop of the phase AL, and the specific circuits of the indicator light loop of the phase BL and the indicator light loop of the phase CL are similar, and are not described again here.
Specifically, a specific circuit diagram of the key display circuit in the present embodiment is shown in fig. 11. IN fig. 11, 7 paths of KEYs (KEY 0_ IN to KEY6_ IN) are arranged through 7 paths of micro switches, and are externally connected with a serial port Liquid Crystal Display (LCD). An alarm circuit can be further integrated in the key display circuit shown in fig. 11, that is, the identification device of the present invention further includes an alarm function, and the abnormal alarm picture displayed by the screen LCD provides the user with maintenance as soon as possible, for example, after the whole device is powered on, the three-phase power transmission side is collected, if at least one of the voltages of the power transmission side is abnormal, the LCD in the key display circuit shown in fig. 11 prompts the alarm, thereby facilitating the phase-failure fault maintenance of the power transmission side of the user; if the power transmission side is normally collected, the device collects the voltage of the user load side, converts and simulates operational amplification to the four-path voltage, and then judges that the phase sequence of the user load side is the same as that of the user side; meanwhile, the corresponding phase signals are transmitted to the corresponding digital comparators, when the digital comparators detect continuous low levels, the phase sequence of the two phase signals transmitted to the digital comparators is judged to be the same, and the corresponding input side phase sequence is the power supply phase sequence; when the digital comparator detects a continuous pulse wave line, the corresponding input side phase sequence is not a power supply phase sequence, the MCU controls the external relay by combining the results of the analog operational amplifier and the digital comparison, and then the indicator lamp displays the corresponding phase sequence identification result and feeds back a signal by the optical coupler; when the above-described triple recognition results match, the recognition result may be displayed by the key display circuit shown in fig. 11, and if they do not match, an alarm may be given by the key display circuit shown in fig. 11.
It should be noted that, the utility model discloses in communication protocol and the software program that adopts be common protocol and computer program among the prior art, the utility model discloses do not relate to the improvement to computer program, based on STM32F103RCT6 singlechip in this embodiment to and the concrete circuit diagram shown in fig. 7-11, combine communication protocol and software program among the prior art, can realize under the load side live wire condition of commutation switch, in real time, accurately discern the power supply phase sequence of commutation switch load side, can be applicable to under the environment such as research and development, production, implementation, greatly improve the work efficiency and the commutation effect of commutation switch, further guarantee transmission line's unbalanced three-phase treatment level, bring economic benefits, security benefits and managerial benefits for the electric power enterprise. The details of the present embodiment are not prior art or common general knowledge and will not be described herein.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (10)
1. A phase sequence recognition device for phase change switch power supply is characterized by comprising a power supply circuit (1), a main control circuit (2), an acquisition circuit (3) and a first phase sequence recognition circuit (4);
the power supply circuit (1) respectively with master control circuit (2), acquisition circuit (3) with first phase sequence identification circuit (4) electricity is connected, first phase sequence identification circuit (4) respectively with master control circuit (2) with acquisition circuit (3) electricity is connected, power supply circuit (1) is connected with the external power source electricity, acquisition circuit (3) are connected with the three-phase input and the load output electricity of commutation switch respectively.
2. The commutation switch supply phase sequence identification device according to claim 1, wherein the supply circuit (1) comprises a switching power supply (11) and a power interface sub-circuit (12);
the power interface sub-circuit (12) is respectively electrically connected with the switching power supply (11) and the power supply, and the switching power supply (11) is respectively electrically connected with the main control circuit (2), the acquisition circuit (3) and the first phase sequence identification circuit (4).
3. The commutation switch supply phase sequence identification device according to claim 2, wherein the acquisition circuit (3) comprises a load side acquisition sub-circuit (31) and a three-way transmission side acquisition sub-circuit (32);
the load side acquisition sub-circuit (31) and the three power transmission side acquisition sub-circuits (32) are respectively and electrically connected with the first phase sequence identification circuit (4), the load side acquisition sub-circuit (31) and the three power transmission side acquisition sub-circuits (32) are also respectively and electrically connected with the switching power supply (11), the load side acquisition sub-circuit (31) is electrically connected with the load output end of the phase change switch, and the three power transmission side acquisition sub-circuits (32) are electrically connected with the three-phase input ends of the phase change switch in a one-to-one correspondence manner; the three power transmission side acquisition sub-circuits (32) are respectively an A-phase acquisition sub-circuit, a B-phase acquisition sub-circuit and a C-phase acquisition sub-circuit.
4. The phase change switch supply phase sequence identification device according to claim 3, characterized in that the first phase sequence identification circuit (4) comprises a four-way sensor (41) and a four-way analog operational amplifier (42);
all the sensors (41) are respectively and electrically connected with the switching power supply (11), all the sensors (41) are also electrically connected with all the analog operational amplifiers (42) in a one-to-one corresponding mode, wherein three paths of the sensors (41) are also electrically connected with the phase A acquisition sub-circuit, the phase B acquisition sub-circuit and the phase C acquisition sub-circuit in a one-to-one corresponding mode, and the rest of the sensors (41) are also electrically connected with the load side acquisition sub-circuit (31); all the analog operational amplifiers (42) are respectively and electrically connected with the main control circuit (2);
the sensor (41) is an A-phase sensor, the sensor (41) is a B-phase sensor, the sensor (41) is electrically connected with the B-phase acquisition sub-circuit in a one-to-one correspondence manner, the sensor (41) is a C-phase sensor, the sensor (41) is electrically connected with the C-phase acquisition sub-circuit in a one-to-one correspondence manner, and the sensor (41) is an L-phase sensor, and the sensor is electrically connected with the load side acquisition sub-circuit (31).
5. The phase change switch power supply phase sequence identification device according to claim 4, wherein the first phase sequence identification circuit (4) further comprises three digital comparators (43), and the three digital comparators (43) are an AL-phase digital comparator, a BL-phase digital comparator and a CL-phase digital comparator respectively;
AL looks digital comparator respectively with A looks sensor with L looks sensor electricity is connected, BL looks digital comparator respectively with B looks sensor with L looks sensor electricity is connected, CL looks digital comparator respectively with C looks sensor with L looks sensor electricity is connected, AL looks digital comparator BL looks digital comparator with CL looks digital comparator still equally divide respectively with master control circuit (2) electricity is connected.
6. A commutation switch supply phase sequence identification device according to claim 3, further comprising a second phase sequence identification circuit (5);
the load side acquisition sub-circuit (31) and the three power transmission side acquisition sub-circuits (32) are also respectively electrically connected with the second phase sequence identification circuit (5), and the second phase sequence identification circuit (5) is respectively electrically connected with the main control circuit (2) and the switching power supply (11).
7. The phase change switch supply phase sequence identification device according to claim 6, characterized in that said second phase sequence identification circuit (5) comprises three way indicator lights (51) and three way relays (52), said three way indicator lights (51) being respectively an AL phase indicator light, a BL phase indicator light and a CL phase indicator light, said three relays (52) being respectively an AL sequential electrical appliance, a BL sequential electrical appliance and a CL sequential electrical appliance;
AL looks pilot lamp respectively with AL electrical apparatus in succession A looks collection sub-circuit with load side gathers sub-circuit (31) electricity and connects, BL looks pilot lamp respectively with BL electrical apparatus in succession B looks collection sub-circuit with load side gathers sub-circuit (31) electricity and connects, CL looks pilot lamp respectively with CL electrical apparatus in succession C looks collection sub-circuit with load side gathers sub-circuit (31) electricity and connects, AL looks pilot lamp BL looks pilot lamp CL looks pilot lamp AL electrical apparatus in succession BL electrical apparatus in succession with CL electrical apparatus in succession equallys divide do not with main control circuit (2) electricity is connected.
8. The phase sequence identification device for the phase change switch power supply according to claim 7, wherein the second phase sequence identification circuit (5) further comprises three optical couplers (53), and the three optical couplers (53) are an AL-phase optical coupler, a BL-phase optical coupler and a CL-phase optical coupler respectively;
the AL looks opto-coupler with the AL looks pilot lamp electricity is connected, the BL looks opto-coupler with the BL looks pilot lamp electricity is connected, the CL looks opto-coupler with the CL looks pilot lamp electricity is connected, the AL looks opto-coupler the BL looks opto-coupler with the CL looks opto-coupler equally divide respectively with main control circuit (2) electricity is connected.
9. The phase change switch power supply phase sequence identification device according to claim 1, further comprising a key display circuit (6);
the key display circuit (6) is electrically connected with the main control circuit (2).
10. The phase change switch power supply phase sequence recognition device according to any one of claims 1 to 9, wherein the main control circuit (2) specifically comprises a single chip microcomputer of STM32F103RCT6 type.
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| CN202021179449.6U CN212872676U (en) | 2020-06-23 | 2020-06-23 | Phase sequence recognition device for phase change switch power supply |
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| CN202021179449.6U CN212872676U (en) | 2020-06-23 | 2020-06-23 | Phase sequence recognition device for phase change switch power supply |
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