CN114371339A - Method for measuring output power of high-voltage isolating switch driving motor - Google Patents
Method for measuring output power of high-voltage isolating switch driving motor Download PDFInfo
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- 238000013024 troubleshooting Methods 0.000 claims description 4
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- 238000001514 detection method Methods 0.000 abstract description 2
- 239000007943 implant Substances 0.000 abstract 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
- G01R31/346—Testing of armature or field windings
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Abstract
The invention relates to a method for measuring output power of a high-voltage isolating switch driving motor, and belongs to the technical field of high-voltage isolating switches. The invention collects the input current and voltage of the drive motor of the isolating switch at the input end of the motor, calculates the input power of the drive motor, further implants a corner sensor in a connecting rod of the isolating switch transmission mechanism to obtain the relation of the corner of the connecting rod and time, thereby obtaining the rotating speed of the motor, further calculates the output power of the drive motor in a slip compensation mode, and further realizes that the output power of the drive motor in the detection technology of the mechanical state of the high-voltage isolating switch based on the motor power is obtained.
Description
Technical Field
The invention belongs to the technical field of high-voltage isolating switches, and particularly relates to a method for measuring output power of a driving motor of a high-voltage isolating switch.
Background
The high-voltage isolating switch is key switch equipment in a power system, has large using amount, plays an important role in isolating voltage and ensuring the safety of maintainers, monitors the mechanical state of the high-voltage isolating switch, is a necessary condition for ensuring the safe and stable operation of the power system and the personal safety of operation and maintenance personnel, and is also a necessary condition for key sequence control double-confirmation criteria of the power system. On-line diagnosis of mechanical failure of a switch based on monitoring of electrical signal characteristics of a high-voltage isolating switch driving motor is a technical means which is most likely to reach one-key sequential control double-confirmation standard at present. Wherein, the power monitoring technology of the power driving motor has the most obvious advantages. The core principle of the driving motor power monitoring technology is an energy balance principle, and the mechanical state of the isolating switch is considered to be directly reflected to the rotating shaft operating torque of the isolating switch, and the rotating shaft operating torque of the isolating switch has a direct corresponding relation with the output power of the driving motor. The evaluation of the mechanical state of the disconnector can thus be carried out by evaluating the motor power.
However, in actual operation, because the driving motor of the high-voltage isolating switch is mostly operated in an open loop mode, namely, only the three-phase access station of the motor stator is used for power, the motor is controlled to start and stop through the three-phase front end contactor and the stroke limit switch, and the motor rotating speed cannot be obtained without a speed sensor, so that the output power of the motor is difficult to obtain. Therefore, how to overcome the defects of the prior art is a problem which needs to be solved urgently in the technical field of the high-voltage isolating switch.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a method for measuring the output power of a high-voltage isolating switch driving motor.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a method for measuring the output power of a high-voltage isolating switch driving motor is disclosed, wherein the isolating switch comprises an isolating switch driving motor and an isolating switch mechanical structure; the isolating switch driving motor is connected with the isolating switch mechanical structure; the isolation switch driving motor is connected to the power utilization three-phase interface of the substation through the contactor; the method is characterized in that: arranging a voltage sensor, a current sensor, a rotation angle sensor and a processor; the processor is respectively connected with the voltage sensor, the current sensor and the corner sensor;
the current sensor is used for acquiring three-phase current at the three-phase power input side of the isolating switch driving motor;
the voltage sensor is used for acquiring three-phase voltage at the three-phase power input side of the isolating switch driving motor;
the corner sensor is used for acquiring the rotation angle of a connecting rod of the isolating switch transmission mechanism in the isolating switch mechanical structure;
the processor is used for receiving data acquired by the voltage sensor, the current sensor and the corner sensor and calculating the output power of the driving motor in a slip compensation mode.
Further, preferably, the processor receives data collected by the voltage sensor, the current sensor and the rotation angle sensor, and calculates the output power of the driving motor in a slip compensation manner, wherein the specific method comprises the following steps:
step (1), after the rotation angle of a connecting rod of a transmission mechanism of an isolating switch is acquired according to a rotation angle sensor, the rotation speed omega is calculated and used as the rotation speed of a motor;
step (2), collecting three-phase current i according to the current sensora、ib、icThe voltage sensor collects three-phase voltage ua、ub、ucCalculating the input power of the drive motor of the isolating switch, and compensating the power of the drive motor in a slip compensation mode, wherein the formula is as follows (1) to (3):
Po＝Pi(1-s) (1)
s＝ωsyn-ω (2)
wherein, PoFor driving motor output power, PiFor driving motor input power, s is slip, omegasynThe synchronous rotation speed of the driving motor is shown, and omega is the rotation speed of the motor; t is a period;
and (3) outputting the output power of the driving motor obtained in the step (2).
Further, it is preferable that the motor rotation speed is equal to the rotation angle of the link of the disconnecting switch transmission mechanism divided by the time. And omega is omega/t, wherein omega is the rotation angle of the connecting rod of the disconnecting switch transmission mechanism which rotates in the time t, and omega is the rotation speed (angular speed) of the motor.
Further, preferably, the current sensor is an inductive current sensor.
The invention also provides a fault diagnosis method for the high-voltage isolating switch, which adopts the method for measuring the output power of the high-voltage isolating switch driving motor to obtain the output power of the driving motor; comparing the output power of the driving motor when the high-voltage isolating switch operates currently with the output power of the driving motor when the high-voltage isolating switch operates normally, and when the output power of the driving motor when the high-voltage isolating switch operates currently exceeds the output power of the driving motor when the high-voltage isolating switch operates normally by +/-10%, judging that the high-voltage isolating switch has a fault possibly and needing further fault troubleshooting.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a method for measuring output power of a high-voltage isolating switch driving motor, which comprises the steps of collecting input current and voltage of the isolating switch driving motor at the input end of the motor, calculating the input power of the driving motor, further implanting a corner sensor in a connecting rod of an isolating switch transmission mechanism to obtain the relation between a connecting rod corner and time so as to obtain the rotating speed of the motor, further calculating the output power of the driving motor in a slip compensation mode, and further realizing the acquisition of the output power of the driving motor in the technology of detecting the mechanical state of the high-voltage isolating switch based on the motor power.
The invention realizes the calculation of the output power of the driving motor of the high-voltage isolating switch, and compared with the fault detection of the high-voltage isolating switch by adopting the input power of the driving motor, the power of the high-voltage isolating switch is closer to the moment of a rotating shaft of an actual operating mechanism, and the high-voltage isolating switch has higher accuracy.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a circuit diagram of a method for measuring output power of a high-voltage isolating switch driving motor according to the invention;
fig. 2 is a waveform diagram for diagnosing jam fault of the high-voltage isolating switch.
Detailed Description
The present invention will be described in further detail with reference to examples.
It will be appreciated by those skilled in the art that the following examples are illustrative of the invention only and should not be taken as limiting the scope of the invention. The specific techniques, connections, conditions, or the like, which are not specified in the examples, are performed according to the techniques, connections, conditions, or the like described in the literature in the art or according to the product specification. The materials, instruments or equipment are not indicated by manufacturers, and all the materials, instruments or equipment are conventional products which can be obtained by purchasing.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, "a plurality" means two or more unless otherwise specified. The terms "inner," "upper," "lower," and the like, refer to an orientation or a state relationship based on that shown in the drawings, which is for convenience in describing and simplifying the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "provided" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. To those of ordinary skill in the art, the specific meanings of the above terms in the present invention are understood according to specific situations.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
As shown in fig. 1, a method for measuring output power of a high-voltage isolating switch driving motor, the isolating switch includes an isolating switch driving motor and an isolating switch mechanical structure; the isolating switch driving motor is connected with the isolating switch mechanical structure; the isolation switch driving motor is connected to the power utilization three-phase interface of the substation through the contactor; arranging a voltage sensor, a current sensor, a rotation angle sensor and a processor; the processor is respectively connected with the voltage sensor, the current sensor and the corner sensor;
the current sensor is used for acquiring three-phase current at the three-phase power input side of the isolating switch driving motor;
the voltage sensor is used for acquiring three-phase voltage at the three-phase power input side of the isolating switch driving motor;
the corner sensor is used for acquiring the rotation angle of a connecting rod of the isolating switch transmission mechanism in the isolating switch mechanical structure;
the processor is used for receiving data acquired by the voltage sensor, the current sensor and the corner sensor and calculating the output power of the driving motor in a slip compensation mode.
In the preferred scheme, the processor receives data collected by the voltage sensor, the current sensor and the corner sensor and calculates the output power of the driving motor in a slip compensation mode, and the specific method comprises the following steps:
step (1), after the rotation angle of a connecting rod of a transmission mechanism of an isolating switch is acquired according to a rotation angle sensor, the rotation speed omega is calculated and used as the rotation speed of a motor;
step (2), collecting three-phase current i according to the current sensora、ib、icThe voltage sensor collects three-phase voltage ua、ub、ucCalculating the input power of the drive motor of the isolating switch, and compensating the power of the drive motor in a slip compensation mode, wherein the formula is as follows (1) to (3):
Po＝Pi(1-s) (1)
s＝ωsyn-ω (2)
wherein, PoFor driving motor output power, PiFor driving motor input power, s is slip, omegasynThe synchronous rotation speed of the driving motor is shown, and omega is the rotation speed of the motor; t is a period; the synchronous rotating speed of the driving motor can be obtained through a factory name plate, and is usually recorded on the factory name plate.
And (3) outputting the output power of the driving motor obtained in the step (2).
Preferably, the motor speed is equal to the rotation angle divided by the time. And omega is omega/t, wherein omega is the rotation angle of the connecting rod of the disconnecting switch transmission mechanism which rotates in the time t, and omega is the rotation speed (angular speed) of the motor.
Preferably, the current sensor is an inductive current sensor.
A high-voltage isolating switch fault diagnosis method adopts the output power measurement method of the high-voltage isolating switch driving motor to obtain the output power of the driving motor; comparing the output power of the driving motor when the high-voltage isolating switch operates currently with the output power of the driving motor when the high-voltage isolating switch operates normally, and when the output power of the driving motor when the high-voltage isolating switch operates currently exceeds the output power of the driving motor when the high-voltage isolating switch operates normally by +/-10%, judging that the high-voltage isolating switch has a fault possibly and needing further fault troubleshooting.
Examples of the applications
As shown in fig. 1, the driving motor of the high-voltage isolating switch is connected to the power utilization three-phase interface of the substation station in an open-loop mode in actual operation, the front end of the driving motor is connected with the contactor, and after the opening and closing instruction is issued, the contactor is closed, the motor loop is powered on, and the motor starts to rotate to drive the isolating switch mechanical structure to realize the opening and closing operation of the isolating switch. The invention collects the voltage and current signals of the driving motor and the rotation angle of the mechanical structure, transmits the signals to the processor, calculates the input power of the motor, calculates the actual rotation speed of the motor according to the rotation angle-time relation, further adopts a slip compensation mode to carry out compensation calculation on the power, obtains the output power of the motor, and finally compares the output power with a torque curve measured when the mechanical state of the switch is normal to obtain the results of monitoring the mechanical state and diagnosing faults.
The specific connection mode of the hardware is shown in fig. 1: nesting an induction type current sensor in three phases of a driving motor stator to measure three-phase current i of the motor statora、ib、icSimultaneously measuring two-phase voltage ua、ubAnd according to uc＝ua-ubU is obtained by calculationc. And the rotation angle of the connecting rod of the transmission mechanism of the isolating switch is used for transmitting the measured electric signal to the data processor.
Performing the following operations in a processor:
compensating the motor power to obtain output power, as formulas (1) to (3):
Po＝Pi(1-s) (1)
s＝ωsyn-ω (2)
wherein, PoFor driving motor output power, PiFor driving motor inputPower, s is slip, ωsynThe synchronous rotation speed of the driving motor is shown, and omega is the rotation speed of the motor; t is a period;
a high-voltage isolating switch fault diagnosis method adopts the output power measurement method of the high-voltage isolating switch driving motor to obtain the output power of the driving motor; comparing the output power of the driving motor when the high-voltage isolating switch operates currently with the output power of the driving motor when the high-voltage isolating switch operates normally, and when the output power of the driving motor when the high-voltage isolating switch operates currently exceeds the output power of the driving motor when the high-voltage isolating switch operates normally by +/-10%, judging that the high-voltage isolating switch has a fault possibly and needing further fault troubleshooting. Different faults can be diagnosed according to the difference of the actually measured power curves, and the jamming fault is shown by taking the jamming fault as an example, as shown in fig. 2, when the output power curve of the driving motor in the current operation of the high-voltage isolating switch is compared with the output power curve of the driving motor in the normal operation of the high-voltage isolating switch, the obvious power absolute value is increased, and then the jamming fault of the transmission mechanism is determined.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A method for measuring the output power of a high-voltage isolating switch driving motor is disclosed, wherein the isolating switch comprises an isolating switch driving motor and an isolating switch mechanical structure; the isolating switch driving motor is connected with the isolating switch mechanical structure; the isolation switch driving motor is connected to the power utilization three-phase interface of the substation through the contactor; the method is characterized in that: arranging a voltage sensor, a current sensor, a rotation angle sensor and a processor; the processor is respectively connected with the voltage sensor, the current sensor and the corner sensor;
the current sensor is used for acquiring three-phase current at the three-phase power input side of the isolating switch driving motor;
the voltage sensor is used for acquiring three-phase voltage at the three-phase power input side of the isolating switch driving motor;
the corner sensor is used for acquiring the rotation angle of a connecting rod of the isolating switch transmission mechanism in the isolating switch mechanical structure;
the processor is used for receiving data acquired by the voltage sensor, the current sensor and the corner sensor and calculating the output power of the driving motor in a slip compensation mode.
2. The method for measuring the output power of the high-voltage isolating switch driving motor according to claim 1, is characterized in that: the processor receives data collected by the voltage sensor, the current sensor and the corner sensor and calculates the output power of the driving motor in a slip compensation mode, and the specific method comprises the following steps:
step (1), after the rotation angle of a connecting rod of a transmission mechanism of an isolating switch is acquired according to a rotation angle sensor, the rotation speed omega is calculated and used as the rotation speed of a motor;
step (2), collecting three-phase current i according to the current sensora、ib、icThe voltage sensor collects three-phase voltage ua、ub、ucCalculating the input power of the drive motor of the isolating switch, and compensating the power of the drive motor in a slip compensation mode, wherein the formula is as follows (1) to (3):
Po＝Pi(1-s) (1)
s＝ωsyn-ω (2)
wherein, PoFor driving motor output power, PiFor driving motor input power, s is slip, omegasynThe synchronous rotation speed of the driving motor is shown, and omega is the rotation speed of the motor; t is a period;
and (3) outputting the output power of the driving motor obtained in the step (2).
3. The method for measuring the output power of the high-voltage isolating switch driving motor according to claim 2, is characterized in that: the motor speed is equal to the rotation angle of the connecting rod of the disconnecting switch transmission mechanism divided by the time.
4. The method for measuring the output power of the high-voltage isolating switch driving motor according to claim 1, is characterized in that: the current sensor is an inductive current sensor.
5. A fault diagnosis method for a high-voltage isolating switch is characterized by comprising the following steps: obtaining the output power of a driving motor by adopting the method for measuring the output power of the high-voltage isolating switch driving motor according to any one of claims 1 to 4; comparing the output power of the driving motor when the high-voltage isolating switch operates currently with the output power of the driving motor when the high-voltage isolating switch operates normally, and when the output power of the driving motor when the high-voltage isolating switch operates currently exceeds the output power of the driving motor when the high-voltage isolating switch operates normally by +/-10%, judging that the high-voltage isolating switch has a fault possibly and needing further fault troubleshooting.
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Application publication date: 20220419 |