CN113037022A - Phase modifier large shaft protection method and device - Google Patents
Phase modifier large shaft protection method and device Download PDFInfo
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- CN113037022A CN113037022A CN202110268728.2A CN202110268728A CN113037022A CN 113037022 A CN113037022 A CN 113037022A CN 202110268728 A CN202110268728 A CN 202110268728A CN 113037022 A CN113037022 A CN 113037022A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
- H02K11/27—Devices for sensing current, or actuated thereby
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/09—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against over-voltage; against reduction of voltage; against phase interruption
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
- H02K11/26—Devices for sensing voltage, or actuated thereby, e.g. overvoltage protection devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/30—Structural association with control circuits or drive circuits
Abstract
The invention relates to the technical field of phase modulators, in particular to a phase modulator large shaft protection method and a phase modulator large shaft protection device, wherein the phase modulator large shaft protection method comprises the steps of obtaining a continuous sampling value of a phase modulator large shaft, wherein the sampling value comprises a shaft voltage and a shaft current; judging whether the sampling value meets the protection starting condition, and starting protection if the sampling value meets the protection starting condition; and judging the continuous sampling value of the main shaft of the camera according to the protection judgment logic, and determining whether to output an overvoltage timing limit alarm signal or an overcurrent timing limit trip signal. The invention collects the shaft voltage and the shaft current of the phase modulator main shaft in real time on the basis of not changing the phase modulator main machine structure, judges the continuous sampling value of the phase modulator main shaft, determines whether an overvoltage timing limit alarm signal or an overcurrent timing limit trip signal is output or not, finds the shaft voltage deterioration in time and sends out an alarm, avoids the problem that the bearing oil film is punctured by the overhigh shaft voltage, causes the continuous discharge of the main shaft to the bearing bush, accelerates the aging of lubricating oil and mechanical wear, and finishes the phase modulator main shaft protection.
Description
Technical Field
The invention relates to the technical field of phase modulators, in particular to a phase modulator large shaft protection method and a phase modulator large shaft protection device.
Background
When the phase modulator is started and normally operates, voltages with different frequencies and amplitudes are superposed on a large shaft due to factors such as magnetic circuit asymmetry, axial magnetic flux, a static excitation system and the like. Too high shaft voltage will break through the bearing oil film to cause the large shaft to continuously discharge to the bearing bush, thus accelerating the aging of lubricating oil and mechanical abrasion. At present, the data acquisition and related research of the protection method of the phase modulator large shaft are not reported, and the 300Mvar phase modulator modulation group protection devices produced by various protection manufacturers are not provided with large shaft protection.
Disclosure of Invention
The invention provides a phase modulator large shaft protection method and a phase modulator large shaft protection device, overcomes the defects of the prior art, and can effectively solve the problem that overvoltage and overcurrent of the phase modulator large shaft cannot be found in time because the phase modulator large shaft is not provided with large shaft protection.
One of the technical schemes of the invention is realized by the following measures: a phase modifier large shaft protection method comprises the following steps:
obtaining a continuous sampling value of a large shaft of the phase modulator, wherein the sampling value comprises shaft voltage and shaft current;
judging whether the sampling value meets a protection starting condition, and starting protection if the sampling value meets the protection starting condition, wherein the protection starting condition is that the shaft voltage is greater than a voltage protection starting value or the shaft current is less than a current protection starting value;
judging a continuous sampling value of a main shaft of the camera according to protection judgment logic, and determining whether an overvoltage timing limit alarm signal or an overcurrent timing limit trip signal is output or not; wherein the protection judgment logic is set according to the operation condition of the large shaft of the phase modulator.
The following is further optimization or/and improvement of the technical scheme of the invention:
the above-mentioned continuous sampling value according to the camera major axis of protection judgement logic is judged, confirms whether to output overvoltage timing time limit alarm signal or overcurrent timing time limit tripping signal, includes:
and the judgment result of the overvoltage timing time limit alarm condition is ANDed, and an overvoltage timing time limit alarm signal is output in response to the operation result being 1, wherein the overvoltage timing time limit alarm condition comprises the following steps: a. b, judging whether the effective value of the shaft voltage is greater than a shaft voltage threshold value or not, and inputting a large shaft protection soft pressing plate, a large shaft protection hard pressing plate, a large shaft protection control word and a starting element or not;
and performing AND operation on the judgment result of the overcurrent timing time limit tripping condition, and outputting an overcurrent timing time limit tripping signal in response to the operation result of 1, wherein the overcurrent timing time limit tripping condition comprises the following steps: a. whether the effective value of the shaft voltage is larger than a shaft voltage threshold value, whether a large shaft protection soft pressing plate, a large shaft protection hard pressing plate, a large shaft protection control word and a starting element are all put into operation, and whether the shaft current at least meets one shaft current protection condition or not.
The shaft current protection conditions include: A. the effective value of the shaft current is larger than the setting value of the shaft current, the modifiable control word of the shaft current is 1, the effective value of the shaft current is larger than the threshold value of the shaft current, the modifiable control word of the shaft current is 1, and the third harmonic value of the shaft current is larger than the measured value of the phase modulator during full-load operation.
The continuous sampling value of the main shaft of the camera is judged according to the protection judgment logic, the protection delay t1 is set when the overvoltage timing limit alarm signal is output, and the overvoltage timing limit alarm signal is output after the delay t 1.
The continuous sampling value of the main shaft of the camera is judged according to the protection judgment logic, the protection delay t2 is set when the overcurrent timing limit tripping signal is output, and the overcurrent timing limit tripping signal is output after the delay t 2.
The method also comprises phase modulator large shaft fault alarm logic judgment, which comprises the steps of judging whether any effective value of shaft voltage and shaft current is zero and the duration is greater than a time set value, outputting phase modulator large shaft fault alarm if the effective value is zero, and judging whether a sampling value meets protection starting conditions if the effective value is not zero; the output phase modulator large shaft fault alarm comprises phase modulator large shaft grounding carbon brush fault alarm information or phase modulator large shaft measuring loop alarm information.
A protection delay t0 is set during the phase modifier large shaft fault alarm, and a phase modifier large shaft fault alarm signal is output after t0 delay.
The second technical scheme of the invention is realized by the following measures: a phase modifier large shaft protection device comprises a data acquisition unit and a phase modifier large shaft protection control unit, wherein the phase modifier large shaft protection control unit comprises a protection starting control unit and a protection judgment logic control unit;
the data acquisition unit is used for acquiring a continuous sampling value of a large shaft of the phase modulator, wherein the sampling value comprises shaft voltage and shaft current;
the protection starting control unit judges whether the sampling value meets a protection starting condition, and starts protection if the sampling value meets the protection starting condition, wherein the protection starting condition is that the shaft voltage is greater than a voltage protection starting value or the shaft current is less than a current protection starting value;
the protection judgment logic control unit judges the continuous sampling value of the main shaft of the camera according to the protection judgment logic and determines whether to output an overvoltage timing limit alarm signal or an overcurrent timing limit trip signal; wherein the protection judgment logic is set according to the operation condition of the large shaft of the phase modulator.
The following is further optimization or/and improvement of the technical scheme of the invention:
the data acquisition unit comprises an RC (resistance-capacitance) loop and a current transformer, wherein two ends of the RC loop are respectively connected with an excitation end grounding carbon brush of the phase modulator large shaft and a barring end grounding carbon brush of the phase modulator large shaft, the current transformer is arranged on a line between the RC loop and the barring end grounding carbon brush of the phase modulator large shaft, the RC loop comprises a capacitor and a resistor, and the capacitor is connected with the resistor in parallel.
The shaft protection control unit also comprises a phase modulator large shaft fault alarm control unit which judges whether any effective value of shaft voltage and shaft current is zero and the duration is greater than a time set value, outputs phase modulator large shaft fault alarm if the effective value is zero, and judges whether a sampling value meets a protection starting condition if the effective value is not zero; the output phase modulator large shaft fault alarm comprises phase modulator large shaft grounding carbon brush fault alarm information or phase modulator large shaft measuring loop alarm information.
The invention collects the shaft voltage and the shaft current of the phase modulator main shaft in real time on the basis of not changing the phase modulator main machine structure, sets a protection starting condition by combining the phase modulator running state and the relevant running parameters and rules, starts protection according to the protection starting condition, sets protection judgment logic, judges the continuous sampling value of the phase modulator main shaft, determines whether to output an overvoltage timing limit alarm signal or an overcurrent timing limit trip signal, finds the shaft voltage deterioration in time and sends an alarm, avoids the problem that the large shaft discharges the bearing bush continuously due to the breakdown of the bearing oil film by the overhigh shaft voltage, accelerates the aging of lubricating oil and mechanical abrasion, and finishes the phase modulator main shaft protection.
Drawings
FIG. 1 is a process flow diagram of example 1 of the present invention.
FIG. 2 is a flowchart of the method of example 2 of the present invention.
FIG. 3 is a flowchart of the method of example 3 of the present invention.
FIG. 4 is a schematic structural diagram of an apparatus according to embodiment 4 of the present invention.
Fig. 5 is a schematic structural diagram of a phase modulator main shaft and a data acquisition unit in connection according to embodiment 4 of the present invention.
Detailed Description
The present invention is not limited by the following examples, and specific embodiments may be determined according to the technical solutions and practical situations of the present invention.
The codes in the figures are respectively: 1 is a phase modulator large shaft, 2 is an excitation end grounding carbon brush, and 3 is a barring end grounding carbon brush.
The invention is further described with reference to the following examples and figures:
example 1: as shown in the attached figure 1, the phase modifier large shaft protection method comprises the following steps:
s101, obtaining continuous sampling values of a phase modulator large shaft 1, wherein the sampling values comprise shaft voltage and shaft current;
s102, judging whether the sampling value meets a protection starting condition, and starting protection if the sampling value meets the protection starting condition, wherein the protection starting condition is that the shaft voltage is greater than a voltage protection starting value or the shaft current is less than a current protection starting value;
s103, judging a continuous sampling value of the main shaft 1 of the camera according to protection judgment logic, and determining whether an overvoltage timing limit alarm signal or an overcurrent timing limit trip signal is output or not; wherein the protection judgment logic is set according to the operation condition of the large shaft of the phase modulator.
The embodiment of the invention discloses a phase modulator large shaft protection method, which is characterized in that the shaft voltage and the shaft current of a phase modulator large shaft 1 are collected in real time on the basis of not changing the main machine structure of the phase modulator, a protection starting condition is set by combining the running state and running related parameters and rules of the phase modulator, protection is started according to the protection starting condition, protection judgment logic is set, the continuous sampling value of the phase modulator large shaft 1 is judged, whether an overvoltage timing limit alarm signal or an overcurrent timing limit trip signal is output or not is determined, the problem of shaft voltage is found in time and an alarm is given out, the problem that the large shaft continuously discharges a bearing bush and the lubricating oil aging and mechanical abrasion are accelerated due to the fact that the bearing oil film is punctured by the overhigh shaft voltage is avoided, and therefore the phase modulator large shaft protection is.
In the above technical solution, in step S102, it is determined whether the sampling value meets the protection starting condition, if so, the protection is started, step S103 is executed, and if not, the protection is not started, and the determination of the next group of sampling values is continued. The protection starting condition is that the shaft voltage is greater than a voltage protection starting value or the shaft current is less than a current protection starting value, the voltage protection starting value and the current protection starting value are both set according to a normal operation parameter value of the phase modulator main shaft 1, the voltage protection starting value can be 9.5V, and the current protection starting value can be 35.34 mA.
In the above technical solution, the protection and judgment logic in step S102 is set according to the operation conditions of the main shaft of the phase modulator, and the specific settings are set according to the actual conditions, wherein the operation conditions of the main shaft of the phase modulator include a shaft voltage range, a shaft current range and a shaft current secondary value range under various operation states (normal, alarm, trip, etc.) of the main shaft 1 of the phase modulator, an actual measurement value of full-load operation of the phase modulator, and the input conditions of the main shaft protection soft pressing plate, the hard function pressing plate and the control word.
Example 2: as shown in fig. 2, a phase modifier large shaft protection method is disclosed, which comprises the following steps:
s201, obtaining continuous sampling values of a phase modulator large shaft 1, wherein the sampling values comprise shaft voltage and shaft current;
s202, judging whether the sampling value meets a protection starting condition, and starting protection if the sampling value meets the protection starting condition, wherein the protection starting condition is that the shaft voltage is greater than a voltage protection starting value or the shaft current is less than a current protection starting value;
s203, performing AND operation on the judgment result of the overvoltage timing limit alarm condition, and outputting an overvoltage timing limit alarm signal in response to the operation result being 1, wherein the overvoltage timing limit alarm condition comprises: a. b, judging whether the effective value of the shaft voltage is greater than a shaft voltage threshold value or not, and inputting a large shaft protection soft pressing plate, a large shaft protection hard pressing plate, a large shaft protection control word and a starting element or not;
s204, performing AND operation on the judgment result of the overcurrent fixed time limit tripping condition, and outputting an overcurrent fixed time limit tripping signal in response to the operation result of 1, wherein the overcurrent fixed time limit tripping condition comprises the following steps: a. whether the effective value of the shaft voltage is larger than a shaft voltage threshold value, whether a large shaft protection soft pressing plate, a large shaft protection hard pressing plate, a large shaft protection control word and a starting element are all put into operation, and whether the shaft current at least meets one shaft current protection condition or not.
In the above technical solution, the anding the judgment result of the overvoltage timing limit alarm condition in step S203, and outputting an overvoltage timing limit alarm signal in response to the operation result being 1, specifically includes:
a. bringing the sampled shaft voltage and shaft current into an overvoltage timing limit alarm condition for judgment;
b. if the effective value of the voltage is larger than the shaft voltage threshold value, outputting 1; the large shaft protection soft pressing plate, the large shaft protection hard pressing plate, the large shaft protection control word and the starting element are all put into operation, and 1 is output; performing AND operation on the two output results, outputting an overvoltage timing limit alarm signal if the output is 1; it should be noted here that, when the overvoltage timing limit alarm signal is output, a protection delay t1 can be set, and after the overvoltage timing limit alarm signal is output after a delay t1, t1 can be specifically adjusted according to the actual condition of the unit, and by setting a time delay, false alarm can be effectively avoided;
c. if the effective value of the voltage is larger than the shaft voltage threshold value, outputting 1; if the large shaft protection soft pressing plate, the large shaft protection hard pressing plate, the large shaft protection control word and the starting element are not all put into use, outputting 0; performing AND operation on the two output results, if the output is 0, not outputting an overvoltage timing limit alarm signal, returning to the step S202, and continuing to judge whether the next group of sampling values meets the protection starting condition;
d. outputting 0 when the effective voltage value is less than or equal to the shaft voltage threshold, and outputting 1 when a large shaft protection soft pressing plate, a large shaft protection hard pressing plate, a large shaft protection control word and a starting element are all put into operation; outputting 0 when the effective voltage value is less than or equal to the shaft voltage threshold, and outputting 0 when the large shaft protection soft pressing plate, the large shaft protection hard pressing plate, the large shaft protection control word and the starting element are not all put into use; in both cases the same as step "c".
It should be noted that, in view of the requirement that the shaft voltage should not be greater than 10V in the DL/T2024-2019 large phase modulator type test guide, the shaft voltage threshold may be 10V.
In the above technical solution, in step S203, the shaft current protection condition includes: A. the effective value of the shaft current is larger than the setting value of the shaft current, the modifiable control word of the shaft current is 1, the effective value of the shaft current is larger than the threshold value of the shaft current, the modifiable control word of the shaft current is 1, and the third harmonic value of the shaft current is larger than the measured value of the phase modulator during full-load operation. Here, it is determined whether the shaft current at least satisfies one shaft current protection condition, that is, the shaft current is carried into A, B, C, and if one of the conditions is satisfied, 1 is output (that is, the matching result with the three conditions is ored). It should be noted that, here, the shaft current setting value and the shaft current threshold value are both set according to the operating parameters and the actual conditions of each stage of the phase modulator main shaft 1, and the shaft current threshold value may be 78.12 mA. Considering the difference of installation process of phase modulator manufacturers and matched main excitation, the content rate of third harmonic of shaft current of the phase modulator is different inevitably, and the shaft current third harmonic protection setting value can be set by referring to the measured value of the shaft current when the phase modulator runs at full load.
In step S203, the determination result of the overcurrent timing trip condition is anded, and in response to the operation result being 1, an overcurrent timing trip signal is output, which specifically includes:
a. carrying out judgment by bringing the sampled shaft voltage and shaft current into an overcurrent timing limit tripping condition;
b. the effective value of the shaft voltage is greater than the threshold value of the shaft voltage, and 1 is output; a large shaft protection soft pressing plate, a large shaft protection hard pressing plate, a large shaft protection control word and a starting element are all put into the device, and 1 is output; the shaft current meets at least one shaft current protection condition and is output 1; performing AND operation on the three output results, outputting 1, and outputting an overcurrent timing trip signal; it should be noted here that a protection delay t2 can be set when the overcurrent timing trip signal is output, the overcurrent timing trip signal is output after the delay t2, t2 can be specifically adjusted according to the actual condition of the unit, and false alarm can be effectively avoided by setting time delay;
c. and (c) outputting a no-overcurrent timing limit trip signal if the combination of the judgment results of all overcurrent timing limit trip conditions in the overcurrent timing limit trip conditions except the condition that the judgment result of each overcurrent timing limit trip condition in the step (b) is 1 and the other combinations of the judgment results of the overcurrent timing limit trip conditions are 0 after the AND operation, and returning to the step (S202) at this moment to continue the judgment whether the next group of sampling values meet the protection starting condition.
Example 3: as shown in fig. 3, a phase modifier large shaft protection method is disclosed, which comprises the following steps:
s301, obtaining continuous sampling values of a phase modulator large shaft 1, wherein the sampling values comprise shaft voltage and shaft current;
s302, judging whether any effective value of the shaft voltage and the shaft current is zero and the duration is greater than a time set value, if so, outputting a fault alarm of a large shaft of the phase modulator, and if not, judging whether a sampling value meets a protection starting condition; the output phase modulator large shaft fault alarm comprises phase modulator large shaft grounding carbon brush fault alarm information or phase modulator large shaft measuring loop alarm information;
s303, judging whether the sampling value meets a protection starting condition, and starting protection if the sampling value meets the protection starting condition, wherein the protection starting condition is that the shaft voltage is greater than a voltage protection starting value or the shaft current is less than a current protection starting value;
s304, performing AND operation on the judgment result of the overvoltage timing limit alarm condition, and outputting an overvoltage timing limit alarm signal in response to the operation result being 1, wherein the overvoltage timing limit alarm condition comprises: a. b, judging whether the effective value of the shaft voltage is greater than a shaft voltage threshold value or not, and inputting a large shaft protection soft pressing plate, a large shaft protection hard pressing plate, a large shaft protection control word and a starting element or not;
s305, performing AND operation on the judgment result of the overcurrent fixed time limit tripping condition, and outputting an overcurrent fixed time limit tripping signal in response to the operation result of 1, wherein the overcurrent fixed time limit tripping condition comprises: a. whether the effective value of the shaft voltage is larger than a shaft voltage threshold value, whether a large shaft protection soft pressing plate, a large shaft protection hard pressing plate, a large shaft protection control word and a starting element are all put into operation, and whether the shaft current at least meets one shaft current protection condition or not.
In the above technical scheme, in step S302, a protection delay t0 is set when the output phase modifier main shaft fault alarm is given, a phase modifier main shaft fault alarm signal is output after a delay t0, t0 can be specifically adjusted according to the actual condition of the unit, and false alarm can be effectively avoided by setting a time delay. It should be noted that the time setting value is set according to actual conditions, and may be set to 15 s.
Example 4: as shown in fig. 4 and 5, the phase modifier large shaft protection device comprises a data acquisition unit and a phase modifier large shaft protection control unit, wherein the phase modifier large shaft protection control unit comprises a protection starting control unit, a protection judgment logic control unit and a phase modifier large shaft fault alarm control unit;
the data acquisition unit is used for acquiring a continuous sampling value of the phase modulator large shaft 1, wherein the sampling value comprises a shaft voltage and a shaft current;
the phase modulator large shaft fault alarm control unit judges whether any effective value of shaft voltage and shaft current is zero and the duration is greater than a time set value, outputs a phase modulator large shaft fault alarm if the effective value is zero, and judges whether a sampling value meets a protection starting condition if the effective value is not zero; the output phase modulator large shaft fault alarm comprises phase modulator large shaft grounding carbon brush fault alarm information or phase modulator large shaft measuring loop alarm information.
The protection starting control unit judges whether the sampling value meets a protection starting condition, and starts protection if the sampling value meets the protection starting condition, wherein the protection starting condition is that the shaft voltage is greater than a voltage protection starting value or the shaft current is less than a current protection starting value;
the protection judgment logic control unit judges the continuous sampling value of the main shaft 1 of the camera according to the protection judgment logic and determines whether to output an overvoltage timing limit alarm signal or an overcurrent timing limit trip signal; wherein the protection judgment logic is set according to the operation condition of the large shaft of the phase modulator.
In the technical scheme, the data acquisition unit comprises an RC (resistance-capacitance) loop and a current transformer, two ends of the RC loop are respectively connected with an excitation end grounding carbon brush 2 of the phase modulator large shaft 1 and a barring end grounding carbon brush 3 of the phase modulator large shaft 1, the current transformer is arranged on a line between the RC loop and the barring end grounding carbon brush 3 of the phase modulator large shaft 1, the RC loop comprises a capacitor and a resistor, and the capacitor is connected with the resistor in parallel.
As shown in fig. 5, when the insulation performance of the bearing base insulating pad at the excitation end is reduced, the oil film may be broken by the shaft voltage, so that the leading line of the excitation end grounding carbon brush 2 in the embodiment of the invention may be damaged. The resistor R in the RC loop can be 500 omega, the capacitor C can be 10 muF, the resistor of 500 omega can limit the shaft current to milliampere level, and the capacitor of 10 muF is connected in parallel to two ends of the resistor and is mainly used for limiting high-frequency pulse voltage brought by a static excitation system. In order to reduce the shaft voltage measurement error caused by the potential difference of different grounding points on two sides of the large shaft in the prior art, the excitation end grounding carbon brush 2 is reliably connected at one point of the large shaft grounding position of the barring end after being led out through an RC loop. The phase modulator shaft current can be measured through a lead-out wire of the disc turning end grounding carbon brush 3 through a core-through current transformer, the core-through current transformer is installed on the upper side of an excitation end connecting place, and the transformation ratio can be 10/1.
If U is the phase modulator large axis voltage, I is the phase modulator large axis current, and R, C is the electrical element of the RC circuit, the effective value of the axis current can be calculated as follows:
when the resistance R in the RC loop is 500 omega and the capacitance C is 10 muF, the change ranges of the effective values of the shaft voltage and the shaft current of the phase modulator main shaft 1 shown in the table 1 under various operation conditions can be calculated according to the formula, so that the method is used for setting parameters such as the shaft voltage threshold, the shaft current setting value and the like in the embodiment of the invention.
The above technical features constitute the best embodiment of the present invention, which has strong adaptability and best implementation effect, and unnecessary technical features can be increased or decreased according to actual needs to meet the requirements of different situations.
TABLE 1 numerical ranges of shaft voltage and shaft current at each stage of phase modulator
| Major axis state | Axial voltage/V | Axial Current/A | Second order of shaft current/mA |
| Is normal | 0～10 | 0～0.372 | 0～37.200 |
| Alarm system | 10～20 | 0.372～0.744 | 37.200～74.400 |
| Trip out | 20～50 | 0.744～1.860 | 74.400～186.000 |
Claims (10)
1. A phase modifier large shaft protection method is characterized by comprising the following steps:
obtaining a continuous sampling value of a large shaft of the phase modulator, wherein the sampling value comprises shaft voltage and shaft current;
judging whether the sampling value meets a protection starting condition, and starting protection if the sampling value meets the protection starting condition, wherein the protection starting condition is that the shaft voltage is greater than a voltage protection starting value or the shaft current is less than a current protection starting value;
judging a continuous sampling value of a main shaft of the camera according to protection judgment logic, and determining whether an overvoltage timing limit alarm signal or an overcurrent timing limit trip signal is output or not; wherein the protection judgment logic is set according to the operation condition of the large shaft of the phase modulator.
2. The phase modulator large shaft protection method according to claim 1, wherein the judging of the continuous sampling value of the phase modulator large shaft according to the protection judgment logic to determine whether to output an overvoltage timing limit alarm signal or an overcurrent timing limit trip signal comprises:
and the judgment result of the overvoltage timing time limit alarm condition is ANDed, and an overvoltage timing time limit alarm signal is output in response to the operation result being 1, wherein the overvoltage timing time limit alarm condition comprises the following steps: a. b, judging whether the effective value of the shaft voltage is greater than a shaft voltage threshold value or not, and inputting a large shaft protection soft pressing plate, a large shaft protection hard pressing plate, a large shaft protection control word and a starting element or not;
and performing AND operation on the judgment result of the overcurrent timing time limit tripping condition, and outputting an overcurrent timing time limit tripping signal in response to the operation result of 1, wherein the overcurrent timing time limit tripping condition comprises the following steps: a. whether the effective value of the shaft voltage is larger than a shaft voltage threshold value, whether a large shaft protection soft pressing plate, a large shaft protection hard pressing plate, a large shaft protection control word and a starting element are all put into operation, and whether the shaft current at least meets one shaft current protection condition or not.
3. A phase modulator large shaft protection method according to claim 2, wherein said shaft current protection condition includes: A. the effective value of the shaft current is larger than the setting value of the shaft current, the modifiable control word of the shaft current is 1, the effective value of the shaft current is larger than the threshold value of the shaft current, the modifiable control word of the shaft current is 1, and the third harmonic value of the shaft current is larger than the measured value of the phase modulator during full-load operation.
4. A phase modulator large shaft protection method according to claim 2 or 3, characterized in that the continuous sampling values of the phase modulator large shaft are judged according to the protection judgment logic, a protection delay t1 is set when the overvoltage timing limit alarm signal is output, and the overvoltage timing limit alarm signal is output after the t1 delay.
5. A phase modulation machine large shaft protection method according to claim 2, 3 or 4, characterized in that the continuous sampling values of the phase modulation machine large shaft are judged according to the protection judgment logic, a protection delay t2 is set when the overcurrent timing time limit trip signal is output, and the overcurrent timing time limit trip signal is output after the t2 delay.
6. The phase modulator large shaft protection method according to claim 1, 2, 3, 4 or 5, characterized by further comprising phase modulator large shaft fault alarm logic judgment, including judging whether any effective value of shaft voltage and shaft current is zero and the duration is greater than a time set value, in response to which, outputting a phase modulator large shaft fault alarm, in response to which, judging whether a sampling value meets a protection starting condition; the output phase modulator large shaft fault alarm comprises phase modulator large shaft grounding carbon brush fault alarm information or phase modulator large shaft measuring loop alarm information.
7. A phase modulation machine large shaft protection method according to claim 6, characterized in that when the phase modulation machine large shaft fault alarm is output, a protection delay t0 is set, and after a delay t0, a phase modulation machine large shaft fault alarm signal is output.
8. A phase modifier large shaft protection device is characterized by comprising a data acquisition unit and a phase modifier large shaft protection control unit, wherein the phase modifier large shaft protection control unit comprises a protection starting control unit and a protection judgment logic control unit;
the data acquisition unit is used for acquiring a continuous sampling value of a large shaft of the phase modulator, wherein the sampling value comprises shaft voltage and shaft current;
the protection starting control unit judges whether the sampling value meets a protection starting condition, and starts protection if the sampling value meets the protection starting condition, wherein the protection starting condition is that the shaft voltage is greater than a voltage protection starting value or the shaft current is less than a current protection starting value;
the protection judgment logic control unit judges the continuous sampling value of the main shaft of the camera according to the protection judgment logic and determines whether to output an overvoltage timing limit alarm signal or an overcurrent timing limit trip signal; wherein the protection judgment logic is set according to the operation condition of the large shaft of the phase modulator.
9. The phase modulator main shaft protection device according to claim 8, wherein the data acquisition unit comprises an RC loop and a current transformer, two ends of the RC loop are respectively connected with an excitation end grounding carbon brush of the phase modulator main shaft and a barring end grounding carbon brush of the phase modulator main shaft, the current transformer is arranged on a line between the RC loop and the barring end grounding carbon brush of the phase modulator main shaft, the RC loop comprises a capacitor and a resistor, and the capacitor is connected with the resistor in parallel.
10. The phase modulator large shaft protection device according to claim 8 or 9, wherein the shaft protection control unit further comprises a phase modulator large shaft fault alarm control unit which judges whether any one of an effective value of a shaft voltage and a shaft current is zero and a duration is greater than a time set value, outputs a phase modulator large shaft fault alarm in response to the judgment, and judges whether a sampling value meets a protection starting condition in response to the judgment; the output phase modulator large shaft fault alarm comprises phase modulator large shaft grounding carbon brush fault alarm information or phase modulator large shaft measuring loop alarm information.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009044836A (en) * | 2007-08-08 | 2009-02-26 | Nishishiba Electric Co Ltd | Power supply system for shipping |
| CN201335880Y (en) * | 2009-03-02 | 2009-10-28 | 李峰 | Shaft current detection device for generator |
| CN106772049A (en) * | 2017-02-28 | 2017-05-31 | 中广核研究院有限公司 | Generator's motor shaft insulating monitoring and positioner and method |
| CN207096309U (en) * | 2017-08-01 | 2018-03-13 | 中广核研究院有限公司 | A kind of steam turbine generator shaft current and shaft voltage on-Line Monitor Device |
| CN109412175A (en) * | 2018-12-14 | 2019-03-01 | 哈尔滨理工大学 | A kind of double axis excitation device of synchronous capacitor |
-
2021
- 2021-03-12 CN CN202110268728.2A patent/CN113037022A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009044836A (en) * | 2007-08-08 | 2009-02-26 | Nishishiba Electric Co Ltd | Power supply system for shipping |
| CN201335880Y (en) * | 2009-03-02 | 2009-10-28 | 李峰 | Shaft current detection device for generator |
| CN106772049A (en) * | 2017-02-28 | 2017-05-31 | 中广核研究院有限公司 | Generator's motor shaft insulating monitoring and positioner and method |
| CN207096309U (en) * | 2017-08-01 | 2018-03-13 | 中广核研究院有限公司 | A kind of steam turbine generator shaft current and shaft voltage on-Line Monitor Device |
| CN109412175A (en) * | 2018-12-14 | 2019-03-01 | 哈尔滨理工大学 | A kind of double axis excitation device of synchronous capacitor |
Non-Patent Citations (1)
| Title |
|---|
| 胡帅，等: "300Mvar调相机大轴保护方案的研究", 《浙江电力》 * |
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