CN110988477A - Power grid phase judgment and checking method - Google Patents
Power grid phase judgment and checking method Download PDFInfo
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- CN110988477A CN110988477A CN201911349775.9A CN201911349775A CN110988477A CN 110988477 A CN110988477 A CN 110988477A CN 201911349775 A CN201911349775 A CN 201911349775A CN 110988477 A CN110988477 A CN 110988477A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention relates to a power grid phase judgment and checking method, which comprises the following steps: connecting two signal introducing modules with a first nuclear phase hole and a second nuclear phase hole respectively; closing the first switch, switching the signal introducing module, and acquiring three-phase electric information of the reference power supply in the first nuclear phase hole from the first nuclear phase hole; collecting three-phase electric information of the reference power supply in the second core phase hole from the second core phase hole; firstly, phase judgment and voltage amplitude judgment of each phase between a first nuclear phase hole and a second nuclear phase hole are carried out, whether the phase difference of each phase of the first nuclear phase hole and the second nuclear phase hole and the voltage amplitude of each phase are in a standard range or not is judged, and if one or more than one phase is not in the standard range, self-checking is displayed to be failed; if the phases are within the standard range, performing nuclear phase operation; and if the nuclear phase results are consistent, displaying that the nuclear phase results are consistent, and if the nuclear phase results are inconsistent, displaying that the nuclear phase results are inconsistent. The invention can effectively improve the accuracy of phase judgment and nuclear phase judgment.
Description
Technical Field
The invention relates to the field of power grid phase judgment and checking, in particular to a power grid phase judgment and checking method.
Background
The current adopted phase checking mode in the power grid is to use a universal meter or a conventional phase checking instrument to alternately check two phases one by one to form a phase difference voltage or phase sequence recording meter, and judge the same phase or different phase in a recording meter form. In actual operation, a universal meter and a conventional phase checking instrument are used for checking phases, wiring is needed for many times, phase difference voltage or phase sequence as many as 24 times needs to be recorded, and finally, the same phase and the different phase are judged manually, so that the operation time is long, the judgment is inconvenient, and the influence of human factors easily causes the error of a phase checking result.
Disclosure of Invention
The invention provides a power grid phase judgment and checking method for overcoming the defect that the phase judgment and the phase checking are easy to be wrong in the prior art.
The power grid phase judging and checking method is realized based on a power grid phase judging and checking device, and the device comprises two signal introducing modules, a signal switching module, a data acquisition module, a CPU (Central processing Unit) and a display module;
the signal introducing module is connected with the input end of the signal switching module, the output module of the signal switching module is connected with the input end of the data acquisition module, the output end of the data acquisition module is connected with the input end of the CPU, and the output end of the CPU is respectively connected with the input end of the real module and the input end of the signal switching module;
the method comprises the following steps:
connecting a signal introducing module into a power grid to be tested;
the power grid to be tested comprises a reference power supply, an access power supply, a tie line, a first core phase hole and a second core phase hole;
the reference power supply and the access power supply respectively output three-phase power;
a first switch is arranged between the reference power supply and the tie line, and a second switch is arranged between the access power supply and the tie line;
the first core phase hole is arranged on any feed line of the reference power supply and is a reference core phase point, the second core phase hole is arranged on the connecting line, and the second core phase hole is positioned between the first switch and the second switch; marking three phase lines corresponding to the first nuclear phase hole as A1, B1 and C1; the three phase lines corresponding to the first nuclear phase hole are marked as A2, B2 and C2;
before phase checking and phase judging, the first switch and the second switch are in an off state;
the two signal introducing modules are respectively connected with the first nuclear phase hole and the second nuclear phase hole;
closing the first switch, starting the power grid phase judging and checking device, switching a signal introducing module, and acquiring three-phase electric information of the reference power supply in a first nuclear phase hole from the first nuclear phase hole; collecting three-phase electric information of the reference power supply in the second core phase hole from the second core phase hole; performing phase judgment and voltage amplitude judgment between each phase of the first nuclear phase hole and each phase corresponding to the second nuclear phase hole, judging whether the phase difference and the voltage amplitude of each phase of the first nuclear phase hole and each phase corresponding to the second nuclear phase hole are in a standard range, and displaying that 'self-check does not pass' if one or more than one phase is not in the standard range; if the phases are within the standard range, performing nuclear phase operation; and if the nuclear phase results are consistent, displaying that the nuclear phase results are consistent, and if the nuclear phase results are inconsistent, displaying that the nuclear phase results are inconsistent.
Preferably, the nuclear phase operation is specifically:
opening the first switch and closing the second switch; the CPU module controls the signal switching module to carry out signal acquisition on phase lines of the first nuclear phase hole and the second nuclear phase hole one by one; then, performing nuclear phase judgment; and displaying the nuclear phase result;
opening the second switch and closing the first switch; the CPU module controls the signal switching module to carry out signal acquisition on phase lines of the first nuclear phase hole and the second nuclear phase hole one by one; then, performing nuclear phase judgment; and displaying the nuclear phase result;
comparing according to the results of two nuclear phases, and if the results are completely consistent, displaying that the nuclear phase results are consistent; if not, it shows "the nuclear phase results are inconsistent".
Preferably, the acquiring of the power supply data comprises acquiring the phase and amplitude of each phase of the two power supplies and the phase angle between any two power supplies in the same power supply.
Preferably, the phase judgment comprises the following steps:
the phase of A1 in the first nuclear phase hole is ∠ A1, the phase of B1 is ∠ B1, the phase of C1 is ∠ C1, the phase of A2 in the second nuclear phase hole is ∠ A2, the phase of B2 is ∠ B2, and the phase of C2 is ∠ C2;
judging ∠ A1- ∠ A2 whether the phase difference is within the standard range, if so, the A phases of the two power supplies are in the same phase, otherwise, the A phases are not considered to be in phase;
judging ∠ B1- ∠ B2 whether the phase difference is within the standard range, if so, the B phases of the two power supplies are in the same phase, otherwise, the B phases are considered to be out of phase;
judging ∠ C1- ∠ C2 whether in the standard range, if in the standard range, the C phases of the two power supplies are in the same phase, otherwise, the C phases are considered to be out of phase;
if the A, B, C phases of both power sources are in phase, then the first and second core phase holes are considered to be in phase, otherwise the first and second core phase holes are considered to be in phase.
Preferably, the standard range of phase difference is less than 5 °.
Preferably, the standard range of voltage amplitudes is: the deviation between the voltage amplitude of each phase in the second core phase hole and the corresponding voltage amplitude in the first core phase hole is less than 10% of the corresponding voltage amplitude of each phase in the first core phase hole.
Preferably, the phase sequence determination specifically is:
setting a phase included angle between an A phase and a B phase in a power supply (comprising a reference power supply and an access power supply) to be ∠ AB, setting a phase included angle between the B phase and a C phase to be ∠ BC, and setting a phase included angle between the C phase and the A phase to be ∠ CA;
if ∠ AB-120 degrees, ∠ BC-120 degrees and ∠ CA-120 degrees are all smaller than the allowable deviation angle of the phase included angle, the phase sequence of the three-phase alternating current of the power supply is considered to be correct, and if any one of the angles is not satisfied, the phase sequence is considered to be incorrect.
Preferably, the phase angle is allowed to deviate by an angle of 5 °.
Preferably, the display module is a liquid crystal display screen.
Preferably, the types of the CPU are: STM 32.
Preferably, the signal switching module is a relay, the model is MY2N-GS, and the model of the data measuring module is AD 4112.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that: the invention can effectively improve the accuracy of phase judgment and nuclear phase judgment.
Drawings
Fig. 1 is a schematic diagram of a power grid phase determining and checking device.
Fig. 2 is a flow chart of a power grid phase determination and checking method.
Fig. 3 and 4 are schematic application diagrams of the power grid phase determining and checking device.
Fig. 5 is a partially enlarged view of fig. 4.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent;
for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product;
it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
Example 1:
the embodiment provides a power grid phase judgment and check method.
The power grid phase judging and checking method is realized based on a power grid phase judging and checking device, as shown in fig. 1, the device comprises two signal introducing modules, a signal switching module, a data acquisition module, a CPU and a display module;
the signal introducing module is connected with the input end of the signal switching module, the output module of the signal switching module is connected with the input end of the data acquisition module, the output end of the data acquisition module is connected with the input end of the CPU, and the output end of the CPU is respectively connected with the input end of the real module and the input end of the signal switching module;
the display module is a liquid crystal display screen.
The CPU model is as follows: STM 32.
The signal switching module is a relay, the model is MY2N-GS, and the model of the data measuring module is AD 4112.
As shown in fig. 2, the method comprises the steps of:
connecting a signal introducing module into a power grid to be tested;
the power grid to be tested comprises a reference power supply, an access power supply, a tie line, a first core phase hole and a second core phase hole;
the reference power supply and the access power supply respectively output three-phase power;
a first switch is arranged between the reference power supply and the tie line, and a second switch is arranged between the access power supply and the tie line;
the first core phase hole is arranged on any feed line of the reference power supply and is a reference core phase point, the second core phase hole is arranged on the connecting line, and the second core phase hole is positioned between the first switch and the second switch; marking three phase lines corresponding to the first nuclear phase hole as A1, B1 and C1; the three phase lines corresponding to the first nuclear phase hole are marked as A2, B2 and C2;
before phase checking and phase judging, the first switch and the second switch are in an off state;
the two signal introducing modules are respectively connected with the first nuclear phase hole and the second nuclear phase hole;
closing the first switch, starting the power grid phase judging and checking device, switching a signal introducing module, and acquiring three-phase electric information of the reference power supply in a first nuclear phase hole from the first nuclear phase hole; collecting three-phase electric information of the reference power supply in the second core phase hole from the second core phase hole; performing phase judgment and voltage amplitude judgment between each phase of the first nuclear phase hole and each phase corresponding to the second nuclear phase hole, judging whether the phase difference and the voltage amplitude of each phase of the first nuclear phase hole and each phase corresponding to the second nuclear phase hole are in a standard range, and displaying that 'self-check does not pass' if one or more than one phase is not in the standard range; if the phases are within the standard range, performing nuclear phase operation; and if the nuclear phase results are consistent, displaying that the nuclear phase results are consistent, and if the nuclear phase results are inconsistent, displaying that the nuclear phase results are inconsistent.
The nuclear phase operation specifically comprises the following steps:
opening the first switch and closing the second switch; the CPU module controls the signal switching module to carry out signal acquisition on phase lines of the first nuclear phase hole and the second nuclear phase hole one by one; then, performing nuclear phase judgment; and displaying the nuclear phase result;
opening the second switch and closing the first switch; the CPU module controls the signal switching module to carry out signal acquisition on phase lines of the first nuclear phase hole and the second nuclear phase hole one by one; then, performing nuclear phase judgment; and displaying the nuclear phase result;
comparing according to the results of two nuclear phases, and if the results are completely consistent, displaying that the nuclear phase results are consistent; if not, it shows "the nuclear phase results are inconsistent".
The acquisition of the power supply data comprises the steps of respectively acquiring the phase and amplitude of each phase of two power supplies and the phase included angle between any two power supplies in the same power supply.
The phase judgment comprises the following steps:
the phase of A1 in the first nuclear phase hole is ∠ A1, the phase of B1 is ∠ B1, the phase of C1 is ∠ C1, the phase of A2 in the second nuclear phase hole is ∠ A2, the phase of B2 is ∠ B2, and the phase of C2 is ∠ C2;
judging ∠ A1- ∠ A2 whether the phase difference is within the standard range, if so, the A phases of the two power supplies are in the same phase, otherwise, the A phases are not considered to be in phase;
judging ∠ B1- ∠ B2 whether the phase difference is within the standard range, if so, the B phases of the two power supplies are in the same phase, otherwise, the B phases are considered to be out of phase;
judging ∠ C1- ∠ C2 whether in the standard range, if in the standard range, the C phases of the two power supplies are in the same phase, otherwise, the C phases are considered to be out of phase;
if the A, B, C phases of both power sources are in phase, then the first and second core phase holes are considered to be in phase, otherwise the first and second core phase holes are considered to be in phase.
The standard range of phase difference is a phase difference of less than 5 °.
The standard range of voltage amplitudes is: the deviation between the voltage amplitude of each phase in the second core phase hole and the corresponding voltage amplitude in the first core phase hole is less than 10% of the corresponding voltage amplitude of each phase in the first core phase hole.
The phase sequence judgment specifically comprises the following steps:
setting a phase included angle between an A phase and a B phase in a power supply to be ∠ AB, a phase included angle between the B phase and a C phase to be ∠ BC, and a phase included angle between the C phase and the A phase to be ∠ CA;
if ∠ AB-120 degrees, ∠ BC-120 degrees and ∠ CA-120 degrees are all smaller than the allowable deviation angle of the phase included angle, the phase sequence of the three-phase alternating current of the power supply is considered to be correct, and if any one of the angles is not satisfied, the phase sequence is considered to be incorrect.
The phase angle is allowed to deviate by an angle of 5 °.
Referring to fig. 3 and 4, two different power supply modes of a 10kV high-voltage switch cabinet and a secondary phase checking of the switch cabinet in practical application are shown, in this embodiment, two signal introducing modules are a first signal introducing module and a second signal introducing module respectively; with a first power supply G02 cabinet as a nuclear phase reference cabinet, marking secondary nuclear phase holes of a nuclear phase reference cabinet G02 as "A1, B1 and C1" (only symbols indicate not actual phases) in sequence from left to right (facing an operation surface of a 10kV high-voltage switch cabinet), marking secondary nuclear phase holes of a G03 cabinet where a ring network switch 603 is located as "A2, B2 and C2" (only symbols indicate not actual phases), and working processes of the grid phase judging and checking device in the embodiment in a specific secondary nuclear phase are as follows:
connecting G02 cabinet nuclear phase holes A1, B1 and C1 to a first signal introducing module, connecting G03 cabinet secondary nuclear phase holes A2, B2 and C2 to a second signal introducing module, firstly controlling a signal switching module by a CPU module to enable A1 phase signal data to be transmitted to a data measuring and collecting module for measuring and collecting data, and finally recording by the CPU module; the CPU module controls the signal switching module to switch B1 phase signal data to be transmitted to the data measuring and collecting module for measuring and data collecting, and the CPU module switches the remaining 4 phases one by one for measuring, collecting and recording after recording. After the 6 phase data are collected and recorded, the CPU module respectively carries out phase sequence self-checking on three-phase data of a G02 cabinet and a G03 cabinet by calculating phase angle difference and voltage amplitude of different phases (for example, the standard value of the phase angle difference of the G02 cabinet is 120 degrees for A1-B1, 240 degrees for A1-C1, and 120 degrees for B1-C1), when the phase angle difference or the voltage amplitude of the G02 cabinet and the G03 cabinet are both in the standard range value, the self-checking is passed, and the next phase checking operation is automatically carried out; when one or more of the out-of-phase angle difference or the voltage amplitude of the G02 cabinet and the G03 cabinet is not within the standard range value, the self-test is not passed, the nuclear phase operation is suspended, and the words "XXX cabinet self-test fails" and related data are displayed on the display screen.
After the self-test is passed, the secondary phase checking is firstly carried out on the G02 cabinet and the G03 cabinet in different power supply modes (which are normal operation modes), as shown in FIG. 3: the switch 601, the switch 602, the switch 604 and the switch 605 are in the closing position, the switch 603 is in the opening position, the G02 cabinet is powered by a first power supply, and the G03 cabinet is powered by a power supply 2. The nuclear phase method is that the three phases A1, B1 and C1 of the reference cabinet G02 are compared with the three phases A2, B2 and C2 of the G03 cabinet respectively, after the comparison is finished, the nuclear phase result is displayed by a display screen, and the nuclear phase operation is suspended. The nuclear phase results are shown in table 1 (for illustration only):
TABLE 1G 02 and G03 phase checking result table powered by different power supplies
| A1-A2 | In phase | B1-A2 | Out of phase | C1-A2 | Out of phase |
| A1-B2 | Out of phase | B1-B2 | In phase | C1-B2 | Out of phase |
| A1-C2 | Out of phase | B1-C2 | Out of phase | C1-C2 | In phase |
As shown in fig. 4 and 5: the G02 cabinet and the G03 cabinet are powered by the same power supply mode, the switch 601, the switch 602, the switch 603 and the switch 605 are in the closing position, the switch 604 is in the opening position, and the G02 cabinet and the G03 cabinet are both powered by the first power supply. After the switching operation is performed according to fig. 4, the secondary phasing of the G02 cabinet and the G03 cabinet is continued in the same power supply manner, the phasing method is the same as the secondary phasing method of the G02 cabinet and the G03 cabinet in different power supply manners, the phasing result is displayed by a display screen, and the phasing result is shown in table 2 (for example only):
TABLE 2G 02 and G03 cases are phase checking result table supplied by the same power supply
| A1-A2 | In phase | B1-A2 | Out of phase | C1-A2 | Out of phase |
| A1-B2 | Out of phase | B1-B2 | In phase | C1-B2 | Out of phase |
| A1-C2 | Out of phase | B1-C2 | Out of phase | C1-C2 | In phase |
According to the results of two nuclear phases, the display screen displays the nuclear phase conclusion. As the results of the nuclear phases in table 1 and table 2 are in complete agreement, it is shown that: the phase sequence and phase electrical corresponding relation of the first power supply and the power supply 2 are consistent; if the two phase checking results are inconsistent, the following results are shown: the phase sequence and phase electrical correspondence of the first power supply and the power supply 2 are inconsistent. And finishing the secondary nuclear phase operation.
The terms describing positional relationships in the drawings are for illustrative purposes only and are not to be construed as limiting the patent;
it should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A power grid phase judging and checking method is characterized in that the power grid phase judging and checking method is realized based on a power grid phase judging and checking device, and the device comprises two signal introducing modules, a signal switching module, a data acquisition module, a CPU (Central processing Unit) and a display module;
the signal introducing module is connected with the input end of the signal switching module, the output module of the signal switching module is connected with the input end of the data acquisition module, the output end of the data acquisition module is connected with the input end of the CPU, and the output end of the CPU is respectively connected with the input end of the real module and the input end of the signal switching module;
the method comprises the following steps:
connecting a signal introducing module into a power grid to be tested;
the power grid to be tested comprises a reference power supply, an access power supply, a tie line, a first core phase hole and a second core phase hole;
the reference power supply and the access power supply respectively output three-phase power;
a first switch is arranged between the reference power supply and the tie line, and a second switch is arranged between the access power supply and the tie line;
the first core phase hole is arranged on any feed line of the reference power supply and is a reference core phase point, the second core phase hole is arranged on the connecting line, and the second core phase hole is positioned between the first switch and the second switch; marking three phase lines corresponding to the first nuclear phase hole as A1, B1 and C1; the three phase lines corresponding to the first nuclear phase hole are marked as A2, B2 and C2;
before phase checking and phase judging, the first switch and the second switch are in an off state;
the two signal introducing modules are respectively connected with the first nuclear phase hole and the second nuclear phase hole;
closing the first switch, starting the power grid phase judging and checking device, switching a signal introducing module, and acquiring three-phase electric information of the reference power supply in a first nuclear phase hole from the first nuclear phase hole; collecting three-phase electric information of the reference power supply in the second core phase hole from the second core phase hole; performing phase judgment and voltage amplitude judgment between each phase of the first nuclear phase hole and each phase corresponding to the second nuclear phase hole, judging whether the phase difference and the voltage amplitude of each phase of the first nuclear phase hole and each phase corresponding to the second nuclear phase hole are in a standard range, and displaying that 'self-check does not pass' if one or more than one phase is not in the standard range; if the phases are within the standard range, performing nuclear phase operation; and if the nuclear phase results are consistent, displaying that the nuclear phase results are consistent, and if the nuclear phase results are inconsistent, displaying that the nuclear phase results are inconsistent.
2. The grid phase judgment and verification method according to claim 1, wherein the phase verification operation specifically comprises:
opening the first switch and closing the second switch; the CPU module controls the signal switching module to carry out signal acquisition on phase lines of the first nuclear phase hole and the second nuclear phase hole one by one; then, performing nuclear phase judgment; and displaying the nuclear phase result;
opening the second switch and closing the first switch; the CPU module controls the signal switching module to carry out signal acquisition on phase lines of the first nuclear phase hole and the second nuclear phase hole one by one; then, performing nuclear phase judgment; and displaying the nuclear phase result;
comparing according to the results of two nuclear phases, and if the results are completely consistent, displaying that the nuclear phase results are consistent; if not, it shows "the nuclear phase results are inconsistent".
3. The power grid phase judgment and verification method according to claim 1 or 2, wherein the collecting of the power supply data comprises collecting the phase and amplitude of each phase of two power supplies and the phase angle between any two power supplies in the same power supply.
4. The grid phase determination and verification method according to claim 3, wherein the phase determination comprises the steps of:
the phase of A1 in the first nuclear phase hole is ∠ A1, the phase of B1 is ∠ B1, the phase of C1 is ∠ C1, the phase of A2 in the second nuclear phase hole is ∠ A2, the phase of B2 is ∠ B2, and the phase of C2 is ∠ C2;
judging ∠ A1- ∠ A2 whether the phase difference is within the standard range, if so, the A phases of the two power supplies are in the same phase, otherwise, the A phases are not considered to be in phase;
judging ∠ B1- ∠ B2 whether the phase difference is within the standard range, if so, the B phases of the two power supplies are in the same phase, otherwise, the B phases are considered to be out of phase;
judging ∠ C1- ∠ C2 whether in the standard range, if in the standard range, the C phases of the two power supplies are in the same phase, otherwise, the C phases are considered to be out of phase;
if the A, B, C phases of both power sources are in phase, then the first and second core phase holes are considered to be in phase, otherwise the first and second core phase holes are considered to be in phase.
5. The grid phase determination and verification method according to claim 4, wherein the standard range of phase difference is less than 5 °.
6. The grid phase judgment and verification method according to any one of claims 5, wherein the standard range of the voltage amplitude is as follows: the deviation between the voltage amplitude of each phase in the second core phase hole and the corresponding voltage amplitude in the first core phase hole is less than 10% of the corresponding voltage amplitude of each phase in the first core phase hole.
7. The grid phase judgment and checking method according to any one of claims 4, 5 or 6, wherein the phase sequence judgment specifically comprises:
setting a phase included angle between an A phase and a B phase in a power supply to be ∠ AB, a phase included angle between the B phase and a C phase to be ∠ BC, and a phase included angle between the C phase and the A phase to be ∠ CA;
if ∠ AB-120 degrees, ∠ BC-120 degrees and ∠ CA-120 degrees are all smaller than the allowable deviation angle of the phase included angle, the phase sequence of the three-phase alternating current of the power supply is considered to be correct, and if any one of the angles is not satisfied, the phase sequence is considered to be incorrect.
8. The grid phase judgment and verification method according to claim 7, wherein the allowable deviation angle of the phase angle is 5 °.
9. The grid phase judging and checking method according to claim 8, wherein the display module is a liquid crystal display.
10. The grid phase judging and checking method according to claim 9, wherein the signal switching module is a relay, the model is MY2N-GS, and the model of the data measuring module is AD 4112; the CPU model is as follows: STM 32.
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| CN112051459A (en) * | 2020-08-31 | 2020-12-08 | 国网北京市电力公司 | Phase checking method and charged display with double phase checking functions |
| CN112946513A (en) * | 2021-02-03 | 2021-06-11 | 山东钢铁股份有限公司 | Phase checking method for power supply of transformer substation |
| CN113325235A (en) * | 2021-05-17 | 2021-08-31 | 国网山东省电力公司济南供电公司 | Asynchronous phase checking system and method based on same reference frequency |
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| CN205608096U (en) * | 2016-05-04 | 2016-09-28 | 国网江苏省电力公司苏州供电公司 | Automatic nuclear phase appearance of public observing and controlling screen secondary voltage of transformer substation |
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| CN112051459B (en) * | 2020-08-31 | 2024-01-02 | 国网北京市电力公司 | Nuclear phase method and electrified display with dual nuclear phase function |
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