CN111707879A - Method for carrying out grid-connected phase checking on generator by using dual-power online phase checking detection device - Google Patents
Method for carrying out grid-connected phase checking on generator by using dual-power online phase checking detection device Download PDFInfo
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Abstract
The invention relates to a method for carrying out grid-connection and phase-checking on a generator by utilizing a dual-power online phase-checking detection device, wherein when three groups of phase-checking indicator lamps of the dual-power online phase-checking detection device are observed to be simultaneously turned off during the judgment and processing of the grid-connection condition of the generator, the generator has the grid-connection condition; if the phenomenon that three groups of phase nuclear phase indicator lamps of the dual-power online nuclear phase detection device are simultaneously dark and simultaneously bright and alternately changed is observed, the rotating speed of the generator needs to be adjusted; if three groups of phase nuclear phase indicating lamps of the dual-power online nuclear phase detection device are observed to be sequentially turned on and off to form rotating lamp light, the phase sequence of the generator and the phase sequence of the power grid are different, and the phase sequence of external wiring of the generator needs to be changed; if three groups of phase nuclear phase indicator lamps of the dual-power online nuclear phase detection device cannot be extinguished at the same time, the rotating speed of the generator needs to be finely adjusted. The invention improves the safety of the generator merging into the power grid.
Description
Technical Field
The invention relates to the technical field of generator grid-connected phase checking, in particular to a method for checking a generator grid-connected phase by using a dual-power online phase checking device.
Background
The existing method for judging the condition of the grid-connected nuclear phase of the generator is to use a nuclear phase instrument to carry out primary artificial nuclear phase judgment (such as the current patent application CN201810053251.4), or to use a special relay monitoring system and the secondary voltage of a generator bus to carry out nuclear phase judgment. The manual phase checking is used for judging whether the grid-connected condition is high-voltage live working or not, high-voltage electric shock danger is caused to phase checking personnel, the requirement on the operation capability of the personnel is high, and a professional instrument phase checking instrument is needed. The high-voltage interconnection switch is usually checked, the high-voltage interconnection switch needs to be pulled out, the baffle of the high-voltage switch bin is opened and fixed, the operations have electric shock risks, and power failure operation is needed for safety, so that the trouble of repeated power failure and power transmission exists; when the nuclear phase is operated, the handheld nuclear phase device is not used properly, and the wiring for connecting the nuclear phase device is incorrect, so that the danger of electric shock and interphase or earth discharge exists. When a special relay monitoring system and the secondary voltage of a generator bus are used for nuclear phase judgment, when grid connection is carried out for the first time, errors may exist due to line connection and relay setting, and certain dangerousness exists in grid connection.
Disclosure of Invention
The invention provides a method for carrying out grid-connected phase checking on a generator by using a dual-power online phase checking detection device, which solves the problems that when the generator needs to be incorporated into a power grid, and a phase checking instrument is used for carrying out phase checking judgment on a generator bus and a system bus under conventional operation, the operation is complex, or potential safety hazards such as electric shock, phase or earth discharge and the like and inconvenience caused by repeated power transmission stopping are caused due to improper operation of personnel, wrong line connection and the like.
The technical scheme adopted by the invention for solving the technical problems is as follows: the method comprises the steps that the dual-power online nuclear phase detection device is used, the dual-power online nuclear phase detection device comprises a section of bus high-voltage live indication detection part, a section of bus high-voltage live indication detection part and a nuclear phase indication part, and the section of bus high-voltage live indication detection part comprises a section of bus first phase detection end, a section of bus second phase detection end, a section of bus third phase detection end and a section of bus grounding end; the first phase detection end of the first section of bus and the first phase indicator light of the first section of bus are connected in parallel, the second phase detection end of the first section of bus and the first phase indicator light of the first section of bus are connected in parallel, and the third phase detection end of the first section of bus and the first phase indicator light of the first section of bus are connected in parallel; the two-section bus high-voltage live indication detection part comprises a two-section bus first phase detection end, a two-section bus second phase detection end, a two-section bus third phase detection end and a two-section bus grounding end; the grounding end of the second-section bus is grounded, a first capacitor of the second-section bus and a first phase indicator lamp of the second-section bus which are connected in parallel are connected between the first phase detection end of the second-section bus and the grounding end of the second-section bus, a second capacitor of the second-section bus and a second phase indicator lamp of the second-section bus which are connected in parallel are connected between the second phase detection end of the second-section bus and the grounding end of the second-section bus, and a third capacitor of the second-section bus and a third phase indicator lamp of the second-section bus which are connected in parallel are connected between the third phase detection; the nuclear phase indicating part comprises a first phase nuclear phase indicating lamp, a second phase nuclear phase indicating lamp and a third phase nuclear phase indicating lamp, the first phase nuclear phase indicating lamp is connected between a first phase detecting end of the first section of the bus and a first phase detecting end of the second section of the bus, the second phase nuclear phase indicating lamp is connected between a second phase detecting end of the first section of the bus and a second phase detecting end of the second section of the bus, and the third phase nuclear phase indicating lamp is connected between a third phase detecting end of the first section of the bus and a third phase detecting end of the second section of the bus, and the nuclear phase indicating part comprises the following steps:
(1) before the bus is electrified, the connection condition of a dual-power online nuclear phase detection device with a section of normally electrified bus high-voltage live indication sensor and a section of generator bus high-voltage live indication sensor is checked, the condition that a signal of the section of bus high-voltage live indication sensor is connected with a section of bus first phase detection end, a section of bus second phase detection end and a section of bus third phase detection end of a section of bus high-voltage live indication detection part in a correct sequence is ensured, and the condition that the signal of the section of generator bus high-voltage live indication sensor is connected with a section of bus first phase detection end, a section of bus second phase detection end and a section of bus third phase detection end of the section of bus high-voltage live indication detection part in a correct;
(2) observing an indicator lamp of the dual-power nuclear phase detection device, detecting voltage at a corresponding electrified detection end of the dual-power online nuclear phase detection device after a section of bus is normally electrified by using a voltmeter, and confirming that the bus is electrified;
(3) judging and processing the grid connection condition of the generator: if the first phase nuclear phase indicator light, the second phase nuclear phase indicator light and the third phase nuclear phase indicator light are simultaneously turned off, and a voltmeter detects that the voltages between the first phase detection end of the first section of bus and the first phase detection end of the second section of bus, the second phase detection end of the first section of bus and the second phase detection end of the second section of bus and the third phase detection end of the first section of bus and the third phase detection end of the second section of bus are 0, the phases of the generator and the power grid are the same, the voltage difference is zero, and the generator has grid-connected conditions; if the first phase nuclear phase indicator light, the second phase nuclear phase indicator light and the third phase nuclear phase indicator light are simultaneously dark and simultaneously bright and alternately changed, the frequency of the generator is unequal to that of the power grid, the generator does not have grid-connected conditions, and the rotating speed of the generator needs to be adjusted; if the first phase nuclear phase indicator light, the second phase nuclear phase indicator light and the third phase nuclear phase indicator light are sequentially turned on and off to form rotating light, it indicates that the phase sequence of the generator and the phase sequence of the power grid are different, the generator does not have grid-connected conditions, and the phase sequence of external wiring of the generator needs to be changed; if the first phase nuclear phase indicator light, the second phase nuclear phase indicator light and the third phase nuclear phase indicator light cannot be extinguished at the same time, the phase angles of the generator and the power grid are unequal, the generator cannot be switched on and connected to the power grid, and the rotating speed of the generator needs to be finely adjusted.
The branch circuit where the first phase indicator lamp of the section of bus is located is connected with a first phase resistor of the section of bus in series, the branch circuit where the second phase indicator lamp of the section of bus is located is connected with a second phase resistor of the section of bus in series, and the branch circuit where the third phase indicator lamp of the section of bus is located is connected with a third phase resistor of the section of bus in series.
The branch circuit where the first phase indicator lamp of the second-section bus is located is connected with a first phase resistor of the second-section bus in series, the branch circuit where the second phase indicator lamp of the second-section bus is located is connected with a second phase resistor of the second-section bus in series, and the branch circuit where the third phase indicator lamp of the second-section bus is located is connected with a third phase resistor of the second-section bus in series.
The phase-locked loop comprises a first phase detection end of a first section of bus, a second phase detection end of a second section of bus, a third phase detection end of a third section of bus, a third phase nuclear phase resistor and a third phase nuclear phase indicator lamp, wherein the first phase nuclear phase resistor is connected with the first phase nuclear phase indicator lamp in series and is arranged between the first phase detection end of the first section of bus and the first phase detection end of the second section of bus, the second phase detection end of the first section of bus and the second phase detection end of the second section of bus are connected with the second phase nuclear phase indicator lamp in series and are connected with the third phase nuclear phase indicator lamp in series and are arranged between the third.
Advantageous effects
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects: the invention utilizes the mature high-voltage electrified sensor which is widely used at present as a signal source to judge whether the generator has the condition of being merged into the power grid, thereby avoiding the technical problem that personnel contact with primary high-voltage electrified equipment during the nuclear phase operation under the conventional operation, and ensuring that the nuclear phase detection and judgment operation is simple, convenient, safe and rapid. The phase change condition of the generator bus and the normal power receiving bus of the system is observed by observing the indication condition of each nuclear phase indicator lamp, whether the generator has the grid-connected condition at that time or not is judged visually, conveniently and quickly, the reason and the processing method which do not have the grid-connected condition can be found conveniently, and the reliability and the safety of grid connection are improved.
Drawings
FIG. 1 is a schematic diagram of a panel of a dual power online nuclear phase detection device according to the present invention;
FIG. 2 is an internal schematic diagram of the dual power supply online nuclear phase detection device of the present invention;
fig. 3 is a schematic diagram of the application of the present invention to a generator grid-connected nuclear phase.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
The embodiment of the invention relates to a method for carrying out grid-connected nuclear phase on a generator by using a dual-power online nuclear phase detection device. The dual-power online nuclear phase detection device comprises a section of bus high-voltage live indication detection part, a section of bus high-voltage live indication detection part and a nuclear phase indication part. The high-voltage live indication detection part of the section of bus comprises a first phase detection end of the section of bus, a second phase detection end of the section of bus, a third phase detection end of the section of bus and a grounding end of the section of bus. The two-section bus high-voltage live indication detection part comprises a two-section bus first phase detection end, a two-section bus second phase detection end, a two-section bus third phase detection end and a two-section bus grounding end. The nuclear phase indicating part comprises a first phase nuclear phase indicator light, a second phase nuclear phase indicator light and a third phase nuclear phase indicator light.
The panel is composed as shown in fig. 1, holes above a first phase indicator lamp 1L1, a second phase indicator lamp 1L2 and a third phase indicator lamp 1L3 of a section of bus are a first phase detection end, a second phase detection end and a third phase detection end of a section of bus, and a hole above 1PE is a grounding end of a section of bus; holes above the first phase indicator lamp 2L1, the second phase indicator lamp 2L2 and the third phase indicator lamp 2L3 of the second segment of bus are a first phase detection end, a second phase detection end and a third phase detection end of the second segment of bus, and a hole above 2PE is a grounding end of the second segment of bus; the first phase nucleus phase indicator lamp L1 is arranged between the first phase indicator lamp 1L1 of the first section of the bus and the phase lamp of the first phase indicator lamp 2L1 of the second section of the bus, the second phase nucleus phase indicator lamp L2 is arranged between the second phase indicator lamp 1L2 of the first section of the bus and the phase lamp of the second phase indicator lamp 2L2 of the second section of the bus, and the third phase nucleus phase indicator lamp L3 is arranged between the third phase indicator lamp 1L3 of the first section of the bus and the phase lamp of the third phase indicator lamp 2L3 of the second section of the bus. The device connecting wires are connected in a split-phase and color-separated mode according to national standard, the grounding wire is yellow green, the L1 phase is yellow line, the L2 phase is green line, and the L3 phase is red line.
As shown in fig. 2, the first segment of bus ground (4# terminal) is grounded, a first capacitor and a first phase indicator 1L1 connected in parallel are connected between the first phase detection end (1# terminal) and the first segment of bus ground (4# terminal), a second capacitor and a second phase indicator 1L2 connected in parallel are connected between the second phase detection end (2# terminal) and the first segment of bus ground (4# terminal), and a third capacitor and a third phase indicator 1L3 connected in parallel are connected between the third phase detection end (3# terminal) and the first segment of bus ground (4# terminal). A section of bus first phase resistor is connected in series on a branch where the first phase indicator lamp 1L1 of the first section of bus is located, a section of bus second phase resistor is connected in series on a branch where the second phase indicator lamp 1L2 of the first section of bus is located, and a section of bus third phase resistor is connected in series on a branch where the third phase indicator lamp 1L3 of the first section of bus is located.
The two-section bus grounding end (8# terminal) is grounded, a two-section bus first capacitor and a two-section bus first phase indicator lamp 2L1 which are connected in parallel are connected between the two-section bus first phase detection end (5# terminal) and the two-section bus grounding end (8# terminal), a two-section bus second capacitor and a two-section bus second phase indicator lamp 2L2 which are connected in parallel are connected between the two-section bus second phase detection end (6# terminal) and the two-section bus grounding end (8# terminal), and a two-section bus third capacitor and a two-section bus third phase indicator lamp 2L3 which are connected in parallel are connected between the two-section bus third phase detection end (7# terminal) and the two-section bus grounding end (8# terminal). A branch where the second-segment bus first phase indicator lamp 2L1 is located is connected in series with a second-segment bus first phase resistor, a branch where the second-segment bus second phase indicator lamp 2L2 is located is connected in series with a second-segment bus second phase resistor, and a branch where the second-segment bus third phase indicator lamp 2L3 is located is connected in series with a second-segment bus third phase resistor.
The first phase nuclear phase indicator light L1 is connected between the first phase detection end (1# terminal) of the first section of the bus and the first phase detection end (5# terminal) of the second section of the bus, and a first phase nuclear phase resistor is further connected in series with the first phase nuclear phase indicator light L1. The second phase nuclear phase indicator light L2 is connected between the second phase detection end (2# terminal) of the first section of the bus and the second phase detection end (6# terminal) of the second section of the bus, and a second phase nuclear phase resistor is further connected in series with the second phase nuclear phase indicator light L2. The third phase nuclear phase indicator light L3 is connected between the third phase detection end (3# terminal) of the first section of the bus and the third phase detection end (7# terminal) of the second section of the bus, and the third phase nuclear phase indicator light L3 is also connected with a third phase nuclear phase resistor in series.
The phase-locked loop circuit is characterized in that a first phase detection end of the first section of bus and a first phase detection end of the second section of bus are connected in series with a first phase nuclear phase indicator lamp, a second phase nuclear phase resistor connected in series with a second phase nuclear phase indicator lamp is arranged between a second phase detection end of the first section of bus and a second phase detection end of the second section of bus, and a third phase nuclear phase resistor connected in series with a third phase nuclear phase indicator lamp is arranged between a third phase detection end of the first section of bus and a third phase detection end of the second section of bus.
When the dual-power online nuclear phase detection device is adopted to carry out grid connection and nuclear phase on a generator, the method specifically comprises the following steps:
the method comprises the following steps that firstly, the dual-power online nuclear phase detection device is checked to be installed perfectly, the device is ensured to be installed firmly, the tail ends of two groups of high-voltage electrified indicating lamps are reliably grounded, and a working power supply of the device is introduced;
secondly, before the bus is powered on, the connection condition of the dual-power online nuclear phase detection device, a section of normal powered bus high-voltage live indication sensor and a section of generator bus high-voltage live indication sensor is checked, as shown in fig. 3, it is ensured that the first-section bus high-voltage charge indication sensor signal is connected with the first-section bus phase detection end (1# terminal), the second-section bus phase detection end (2# terminal) and the third-section bus phase detection end (3# terminal) of the first-section bus high-voltage charge indication detection portion in the correct order, and the second-section generator bus high-voltage charge indication sensor signal is connected with the first-section bus phase detection end (5# terminal), the second-section bus phase detection end (6# terminal) and the third-section bus phase detection end (7# terminal) of the second-section bus high-voltage charge indication detection portion in the correct order.
And step three, checking the electrified condition of the bus after power is received, observing indicator lamps (namely 1L1, 1L2 and 1L3) of the dual-power-supply nuclear phase detection device, detecting the voltage of a corresponding electrified detection end of the dual-power-supply online nuclear phase detection device after a section of bus is normally powered by using a voltmeter, and confirming that the bus is powered.
Step four, judging and processing the grid-connected condition of the generator: if the first phase nuclear phase indicator light L1, the second phase nuclear phase indicator light L2 and the third phase nuclear phase indicator light L3 are simultaneously turned off, and a voltmeter detects that the voltages between the first phase detection end of the first section of the bus and the first phase detection end of the second section of the bus, the second phase detection end of the first section of the bus and the second phase detection end of the second section of the bus and the third phase detection end of the first section of the bus and the third phase detection end of the second section of the bus are all 0, the phases of the generator and the power grid are the same, the voltage difference is zero, and the generator has grid-connected conditions; if the first phase nuclear phase indicator light L1, the second phase nuclear phase indicator light L2 and the third phase nuclear phase indicator light L3 are simultaneously dark and simultaneously bright and alternate, the frequency of the generator is unequal to that of the power grid, the generator does not have grid connection conditions, and the rotating speed of the generator needs to be adjusted; if the first phase nuclear phase indicator light L1, the second phase nuclear phase indicator light L2 and the third phase nuclear phase indicator light L3 are turned on and off in sequence to form rotating light, it indicates that the phase sequence of the generator and the power grid is different, the generator does not have grid connection conditions, and the phase sequence of the generator needs to be changed; if the first phase nuclear phase indicator light L1, the second phase nuclear phase indicator light L2 and the third phase nuclear phase indicator light L3 cannot be extinguished at the same time, the phase angles of the generator and the power grid are unequal, the generator cannot be switched on and connected to the power grid, and the rotating speed of the generator needs to be finely adjusted.
The invention can visually and conveniently indicate the reason and the required measures when the generator does not have the grid-connected condition by observing the power supply phase change of the generator bus and the normal power receiving bus of the system, thereby improving the safety of the generator merging into the power grid.
Claims (4)
1. A method for carrying out grid-connected phase checking on a generator by utilizing a dual-power online nuclear phase detection device is characterized in that the dual-power online nuclear phase detection device is used, the dual-power online nuclear phase detection device comprises a section of bus high-voltage live indication detection part, a section of bus high-voltage live indication detection part and a nuclear phase indication part, and the section of bus high-voltage live indication detection part comprises a section of bus first phase detection end, a section of bus second phase detection end, a section of bus third phase detection end and a section of bus grounding end; the first phase detection end of the first section of bus and the first phase indicator light of the first section of bus are connected in parallel, the second phase detection end of the first section of bus and the first phase indicator light of the first section of bus are connected in parallel, and the third phase detection end of the first section of bus and the first phase indicator light of the first section of bus are connected in parallel; the two-section bus high-voltage live indication detection part comprises a two-section bus first phase detection end, a two-section bus second phase detection end, a two-section bus third phase detection end and a two-section bus grounding end; the grounding end of the second-section bus is grounded, a first capacitor of the second-section bus and a first phase indicator lamp of the second-section bus which are connected in parallel are connected between the first phase detection end of the second-section bus and the grounding end of the second-section bus, a second capacitor of the second-section bus and a second phase indicator lamp of the second-section bus which are connected in parallel are connected between the second phase detection end of the second-section bus and the grounding end of the second-section bus, and a third capacitor of the second-section bus and a third phase indicator lamp of the second-section bus which are connected in parallel are connected between the third phase detection; the nuclear phase indicating part comprises a first phase nuclear phase indicating lamp, a second phase nuclear phase indicating lamp and a third phase nuclear phase indicating lamp, the first phase nuclear phase indicating lamp is connected between a first phase detecting end of the first section of the bus and a first phase detecting end of the second section of the bus, the second phase nuclear phase indicating lamp is connected between a second phase detecting end of the first section of the bus and a second phase detecting end of the second section of the bus, and the third phase nuclear phase indicating lamp is connected between a third phase detecting end of the first section of the bus and a third phase detecting end of the second section of the bus, and the nuclear phase indicating part comprises the following steps:
(1) before the two sections of buses are electrified, detecting the connection condition of a dual-power online nuclear phase detection device with a section of normally electrified bus high-voltage live indication sensor and a section of generator bus high-voltage live indication sensor, ensuring that a section of bus high-voltage live indication sensor signal is connected with a section of bus first phase detection end, a section of bus second phase detection end and a section of bus third phase detection end of a section of bus high-voltage live indication detection part in a correct sequence, and ensuring that a section of generator bus high-voltage live indication sensor signal is connected with a section of bus first phase detection end, a section of bus second phase detection end and a section of bus third phase detection end of a section of bus high-voltage live indication detection part in a correct sequence;
(2) observing an indicator lamp of the dual-power nuclear phase detection device, detecting voltage at a corresponding electrified detection end of the dual-power online nuclear phase detection device after a section of bus is normally electrified by using a voltmeter, and confirming that the bus is electrified;
(3) judging and processing the grid connection condition of the generator: if the first phase nuclear phase indicator light, the second phase nuclear phase indicator light and the third phase nuclear phase indicator light are simultaneously turned off, and a voltmeter detects that the voltages between the first phase detection end of the first section of bus and the first phase detection end of the second section of bus, the second phase detection end of the first section of bus and the second phase detection end of the second section of bus and the third phase detection end of the first section of bus and the third phase detection end of the second section of bus are 0, the phases of the generator and the power grid are the same, the voltage difference is zero, and the generator has grid-connected conditions; if the first phase nuclear phase indicator light, the second phase nuclear phase indicator light and the third phase nuclear phase indicator light are simultaneously dark and simultaneously bright and alternately changed, the frequency of the generator is unequal to that of the power grid, the generator does not have grid-connected conditions, and the rotating speed of the generator needs to be adjusted; if the first phase nuclear phase indicator light, the second phase nuclear phase indicator light and the third phase nuclear phase indicator light are sequentially turned on and off to form rotating light, it indicates that the phase sequence of the generator and the phase sequence of the power grid are different, the generator does not have grid-connected conditions, and the phase sequence of external wiring of the generator needs to be changed; if the first phase nuclear phase indicator light, the second phase nuclear phase indicator light and the third phase nuclear phase indicator light cannot be extinguished at the same time, the phase angles of the generator and the power grid are unequal, the generator cannot be switched on and connected to the power grid, and the rotating speed of the generator needs to be finely adjusted.
2. The method for the grid-connected nuclear phase of the generator by using the dual power supply online nuclear phase detection device according to claim 1, wherein a branch where the first phase indicator lamp of the first section of the bus is located is connected with a first phase resistor of the first section of the bus in series, a branch where the second phase indicator lamp of the first section of the bus is located is connected with a second phase resistor of the second section of the bus in series, and a branch where the third phase indicator lamp of the first section of the bus is located is connected with a third phase resistor of the first section of the bus in series.
3. The method for the grid-connected nuclear phase of the generator by using the dual-power online nuclear phase detection device according to claim 1, wherein a branch where the first phase indicator lamp of the second-section bus is located is connected with a first phase resistor of the second-section bus in series, a branch where the second phase indicator lamp of the second-section bus is located is connected with a second phase resistor of the second-section bus in series, and a branch where the third phase indicator lamp of the second-section bus is located is connected with a third phase resistor of the second-section bus in series.
4. The method for carrying out grid connection and phase nucleus on the generator by using the dual-power online nuclear phase detection device according to claim 1, wherein a first phase nuclear phase resistor connected with a first phase nuclear phase indicator lamp in series is further arranged between the first phase detection end of the first section of the bus and the first phase detection end of the second section of the bus, a second phase nuclear phase resistor connected with a second phase nuclear phase indicator lamp in series is further arranged between the second phase detection end of the first section of the bus and the second phase detection end of the second section of the bus, and a third phase nuclear phase resistor connected with a third phase nuclear phase indicator lamp in series is further arranged between the third phase detection end of the first section of the bus and the third phase detection end of the second section of the bus.
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