CN113064027B - Insulation testing method before unit starting and electronic equipment - Google Patents
Insulation testing method before unit starting and electronic equipment Download PDFInfo
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- CN113064027B CN113064027B CN202110233364.4A CN202110233364A CN113064027B CN 113064027 B CN113064027 B CN 113064027B CN 202110233364 A CN202110233364 A CN 202110233364A CN 113064027 B CN113064027 B CN 113064027B
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- 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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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Abstract
The application relates to an insulation test method and device before a unit is started, electronic equipment and a storage medium. The method comprises the following steps: when a unit meets a preset starting condition in a shutdown standby state, responding to a starting instruction, and controlling an excitation system of the unit to send an instantaneous excitation voltage to a rotor of the unit; and obtaining the stator induction voltage amplitude of the unit and the stator induction voltage duration of the unit, comparing the stator induction voltage amplitude and the stator induction voltage duration with corresponding voltage threshold and time threshold respectively to obtain corresponding comparison results, and opening a unit starting process when the comparison results meet corresponding preset conditions. By adopting the method, the insulation test before starting can be realized without backing up isolation and additionally increasing a preset voltage source for the unit.
Description
Technical Field
The present disclosure relates to the field of power systems, and in particular, to an insulation testing method and apparatus before a unit is started, an electronic device, and a storage medium.
Background
Before the power plant carries out maintenance work on the unit, the disconnecting links on all sides which are possibly powered on need to be pulled open, and the grounding disconnecting links (grounding wires) need to be closed (installed), and the like, so that safety measures are arranged on primary equipment and secondary equipment of the unit. Before the maintenance work is finished and the unit is started, safety measures on primary equipment and secondary equipment of the unit need to be removed by pulling the grounding knife switch open, removing the grounding wire and the like. If the grounding wire is missed to be disconnected before the unit is started, the grounding knife switch is not pulled open, a vicious electrical misoperation accident with a grounding wire circuit breaker can occur, or when the problem of primary equipment insulation damage occurs before the unit is started, the fault of equipment short circuit can also occur, and great loss is brought to safe production.
In the current electric power industry, through insulating the heavy loss in presetting prevention safety in production before starting the unit, when carrying out insulating preliminary examination before starting the unit at present, all need go on under the state that the unit moved back to be equipped with, and can't accomplish to launch before starting at every turn. The method is mainly used for preventing vicious electrical misoperation accidents with a grounding circuit breaker, and on one hand, the safety protection can be realized only by means of the operation personnel to observe safety regulations and field regulations by means of strict safety management. On the one hand, the electric five-prevention or key locking system is relied on, but the grounding point before the power transmission of the electric equipment which is incorporated into the electric five-prevention system and the key locking system can be avoided only in the operation layer. On one hand, the protection of the unit is relied on, but the condition that the insulation is broken down in the normal operation process of the unit can only be protected.
The method provided by the invention fully utilizes the structure of the generator, can be used as an independent protection device under the condition that the unit does not need backup isolation on the premise of not additionally increasing a pre-test voltage source, and can also be used as a protection program of a computer monitoring system to realize the insulation self-check of primary equipment before the unit is started. The vicious electrical misoperation accident with the grounding wire breaker caused by wrong wire connection of personnel, temporary grounding wire removal omission or non-pulling of the grounding disconnecting link before the unit is started is effectively avoided, and the short-circuit fault caused by insulation damage of primary equipment of the unit can be avoided.
Disclosure of Invention
In view of the above, it is desirable to provide an insulation test method, apparatus, electronic device and storage medium before starting up of a unit, which enables the unit to perform an insulation test without backup isolation and additional pre-test voltage sources.
A method of insulation testing prior to startup of a unit, the method comprising:
when a unit meets a preset starting condition in a shutdown standby state, responding to a starting instruction, and controlling an excitation system of the unit to send an instantaneous excitation voltage to a rotor of the unit;
and obtaining the stator induction voltage amplitude of the unit and the stator induction voltage duration of the unit, comparing the stator induction voltage amplitude and the stator induction voltage duration with corresponding voltage threshold and time threshold respectively to obtain corresponding comparison results, and opening a unit starting process when the comparison results meet corresponding preset conditions.
In one embodiment, the controlling the excitation system of the unit to send the instantaneous excitation voltage to the rotor of the unit includes:
and starting the excitation system, closing an excitation switch, and controlling the excitation system of the unit to send instantaneous excitation voltage to the rotor of the unit according to preset time.
In one embodiment, the obtaining the amplitude of the stator induced voltage of the unit and the duration of the stator induced voltage of the unit includes:
after the excitation system is controlled to send the instantaneous excitation voltage to the rotor of the unit, in the process that the rotor establishes an excitation magnetic field based on the instantaneous excitation voltage, the amplitude of three-phase voltage induced in a stator loop and the duration of the three-phase voltage induced in the stator loop are obtained through a voltage transformer, the amplitude of the three-phase voltage is used as the amplitude of the stator induced voltage, and the duration of the three-phase voltage is used as the duration of the stator induced voltage of the unit.
In one embodiment, the duration of the three-phase voltage induced by the stator circuit is the time when the amplitude of the three-phase voltage induced by the stator circuit is higher than the preset proportion of the rated three-phase voltage amplitude.
In one embodiment, the step of comparing the stator induced voltage amplitude and the stator induced voltage duration with a corresponding voltage threshold and a corresponding time threshold respectively to obtain a comparison result, and opening a unit starting process when the comparison results both satisfy a preset condition includes:
and comparing the stator induction voltage amplitude and the stator induction voltage duration with a corresponding voltage threshold and a corresponding time threshold respectively, and when the stator induction voltage amplitude is greater than or equal to the voltage threshold and the stator induction voltage duration is greater than or equal to the time threshold, meeting a corresponding preset condition and opening a unit starting process.
In one embodiment, the determining of the voltage threshold includes:
obtaining the maximum leakage current and the minimum insulation resistance of primary equipment of the unit at room temperature from equipment preventive test regulations according to the model of the unit;
and determining the voltage threshold value based on the maximum leakage current, the lowest insulation resistance and a preset safety factor.
In one embodiment, the determining the voltage threshold based on the maximum leakage current, the lowest insulation resistance, and a preset safety factor includes:
and determining the voltage threshold value based on the product of the maximum leakage current, the lowest insulation resistance and a preset safety factor.
In one embodiment, the time threshold is a discharge time of a primary device of the unit.
In one embodiment, the method further comprises the following steps:
and when the amplitude of any phase of stator induction voltage of the stator induction voltage amplitude of the unit is smaller than the voltage threshold, or when the duration of any phase of stator induction voltage of the stator induction voltage duration of the unit is smaller than the time threshold, outputting alarm information.
An insulation testing apparatus prior to start-up of a unit, the apparatus comprising:
the instantaneous excitation voltage control module is used for responding to a starting instruction when the unit meets a preset starting condition in a shutdown standby state and controlling an excitation system of the unit to send instantaneous excitation voltage to a rotor of the unit;
and the insulation judgment module is used for acquiring the stator induction voltage amplitude of the unit and the stator induction voltage duration of the unit, comparing the stator induction voltage amplitude and the stator induction voltage duration with corresponding voltage threshold and time threshold respectively to obtain a corresponding comparison result, and opening a unit starting process when the comparison result meets corresponding preset conditions.
An electronic device comprising a memory storing a computer program and a processor implementing the steps of the method described above when the processor executes the computer program.
A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the above-mentioned method.
According to the insulation test method, the device, the electronic equipment and the storage medium before the unit is started, when the fact that the unit meets the preset starting condition in the shutdown standby state is determined, the excitation system of the unit is controlled to send the instantaneous excitation voltage to the rotor of the unit in response to a starting instruction, the stator induction voltage amplitude of the unit and the stator induction voltage duration of the unit are obtained, the stator induction voltage amplitude and the stator induction voltage duration of the unit are compared with the corresponding preset threshold respectively to obtain the corresponding comparison result, the unit starting process is opened only when the comparison result meets the corresponding preset condition, and therefore the insulation test before the unit is started can be achieved based on the measured stator induction voltage amplitude of the unit and the measured stator induction voltage duration of the unit. By the method, the insulation test before starting can be realized without backing up isolation and additionally increasing a preset voltage source.
Drawings
FIG. 1 is a diagram of an application environment of an insulation testing method before a unit is started according to an embodiment;
FIG. 2 is a schematic flow chart illustrating an insulation testing method before a unit is started according to an embodiment;
FIG. 3 is a schematic flow chart of an insulation testing method before a unit is started in one embodiment;
FIG. 4 is a block diagram of an insulation testing apparatus before a unit is started according to an embodiment;
FIG. 5 is a diagram of the internal structure of an electronic device in one embodiment;
FIG. 6 is a diagram illustrating an internal structure of an electronic device in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The insulation testing method before the unit is started can be applied to the application environment shown in fig. 1. The unit 102 is integrated with a primary device, a secondary device, and an excitation system, and the unit 102 communicates with the electronic device 104 through a network. The electronic device 104 responds to a starting instruction by determining that the unit 102 meets a preset starting condition in a shutdown standby state, and controls an excitation system of the unit to send an instantaneous excitation voltage to a rotor of the unit; and obtaining the stator induction voltage amplitude of the unit and the stator induction voltage duration of the unit, comparing the stator induction voltage amplitude and the stator induction voltage duration with corresponding voltage threshold and time threshold respectively to obtain corresponding comparison results, and opening a unit starting process when the comparison results meet corresponding preset conditions.
Primary equipment refers to high-voltage electrical equipment that is directly used in the production process of producing, transporting, and distributing electrical energy. The secondary equipment is low-voltage electrical equipment which is required by monitoring, controlling, adjusting and protecting the work of primary equipment and providing operation conditions or production command signals for operation and maintenance personnel, such as fuses, buttons, indicator lamps, control switches, relays, signal equipment and the like. The electronic device 104 may be a terminal device, which may be independent from the machine set or integrated with the machine set, wherein the terminal may be but not limited to various personal computers, notebook computers, smart phones, tablet computers, and portable wearable devices, optionally, the electronic device 104 may also be a server independent from the machine set, and the server may be implemented by an independent server or a server cluster composed of a plurality of servers.
Due to the structure of the generator, on the premise that a pre-test voltage source is not additionally added, the generator of the generator set can be directly subjected to insulation test under the condition that the generator set does not need to be backuped and isolated, relevant parameters are obtained, whether the generator set starting process is opened or not is determined after the relevant parameters are correspondingly processed, and therefore in the embodiment of the application, the insulation test before the generator set is started is completed through relevant operation on the generator of the generator set.
In one embodiment, as shown in fig. 2, there is provided an insulation testing method before a unit is started, which is described by taking the method as an example applied to the electronic device in fig. 1, and includes the following steps:
step 202, when the unit meets a preset starting condition in a shutdown standby state, responding to a starting instruction, and controlling an excitation system of the unit to send an instantaneous excitation voltage to a rotor of the unit.
The shutdown standby state of the unit means that the unit is in a standby state, and the unit can be switched into an operating state through closing operation. The preset starting condition refers to that the state of each device of the unit monitored by the electronic device meets the starting condition of the unit, for example, the maintenance measures of the primary device and the secondary device of the unit are removed, the service power and the control system thereof supporting the normal operation of the unit, the public device and the control system thereof are in the operating state, the starting signal of each locking unit is reset, the rotating speed of the unit is zero, the outlet switch is opened, each protection of the unit is put into use, and the like.
The excitation system supplied with excitation electric power from the generator terminals or the auxiliary winding of the generator is called a self-excitation system, and the excitation system supplied with excitation electric power from a power source other than the generator, for example, an alternating-current or direct-current exciter or a power grid is called a self-excitation system. The unit in the present application is in a standby state, and requires a power supply to supply an instantaneous excitation voltage to the rotor, so the excitation system in the embodiment of the present application may include a separate excitation system and a self-excitation system.
In one embodiment, when it is determined that a preset starting condition is met, responding to a starting instruction, wherein after the electronic device responds to the starting instruction, whether the function of the unit is normally put into operation or not can be detected, and after the function of the unit is normally put into operation, an excitation system of the unit is controlled to send an instantaneous excitation voltage to a rotor of the unit.
Step 204, obtaining a stator induced voltage amplitude of the unit and a stator induced voltage duration of the unit, comparing the stator induced voltage amplitude and the stator induced voltage duration with a corresponding voltage threshold and a corresponding time threshold respectively to obtain a corresponding comparison result, and opening a unit starting process when the comparison result meets a corresponding preset condition.
The stator induction voltage amplitude refers to a three-phase voltage amplitude induced in a stator loop, the stator induction voltage duration of the unit refers to the duration of the three-phase voltage induced in the stator loop, wherein the duration of the three-phase voltage induced in the stator loop can be the time when the amplitude of the three-phase voltage induced in the stator loop is higher than a rated three-phase voltage amplitude of a preset proportion, the voltage threshold refers to a voltage condition value which needs to be met by the preset stator induction voltage amplitude, the time threshold refers to a time condition value which needs to be met by the preset stator induction voltage duration, and for example, the time threshold can be the discharge time of primary equipment of the unit.
In one embodiment, after an excitation system of the unit sends an instantaneous excitation voltage to a rotor of the unit, the amplitude of the stator induced voltage of the unit and the duration of the stator induced voltage of the unit are obtained, the amplitude of the stator induced voltage and the duration of the stator induced voltage are compared with a corresponding voltage threshold and a corresponding time threshold respectively to obtain a corresponding comparison result, and when the comparison result meets a corresponding preset condition, a unit starting process is opened.
In the insulation test method before the unit is started, when the unit meets the preset starting condition in a shutdown standby state, an excitation system of the unit is controlled to send instantaneous excitation voltage to a rotor of the unit in response to a starting instruction; and obtaining the stator induction voltage amplitude of the unit and the stator induction voltage duration of the unit, comparing the stator induction voltage amplitude and the stator induction voltage duration with corresponding voltage threshold and time threshold respectively to obtain corresponding comparison results, and opening a unit starting process when the comparison results meet corresponding preset conditions. Therefore, by the method, the insulation test before starting can be realized without backing up isolation and additionally increasing a preset voltage source.
In one embodiment, the controlling the excitation system of the unit to send the instantaneous excitation voltage to the rotor of the unit includes:
and starting the excitation system, closing an excitation switch, and controlling the excitation system of the unit to send instantaneous excitation voltage to the rotor of the unit according to preset time.
The specific method for controlling the excitation system of the unit to send the instantaneous excitation voltage to the rotor of the unit is that the excitation switch is turned on, and the instantaneous excitation voltage is sent to the rotor of the unit according to preset time, wherein the preset time refers to the duration of the preset instantaneous excitation voltage, on one hand, the duration of the instantaneous excitation voltage needs to be ensured to be enough, so that a three-phase voltage amplitude can be induced in a stator loop, and on the other hand, the instant excitation voltage is sent to the rotor suddenly, so that the stator is heated, and a short circuit occurs, so that the time for sending the instantaneous excitation voltage to the rotor of the unit needs to be set in a proper range according to the actual condition of the current unit, for example, the duration of the instantaneous excitation voltage can be set to be more than 1 second but not more than 3 seconds. Therefore, the method can be used for acquiring the stator induction voltage amplitude of the unit in the subsequent steps and ensuring the safety.
In one embodiment, the obtaining the amplitude of the stator induced voltage of the unit and the duration of the stator induced voltage of the unit includes:
after the excitation system is controlled to send the instantaneous excitation voltage to the rotor of the unit, in the process that the rotor establishes an excitation magnetic field based on the instantaneous excitation voltage, the amplitude of three-phase voltage induced in a stator loop and the duration of the three-phase voltage induced in the stator loop are obtained through a voltage transformer, the amplitude of the three-phase voltage is used as the amplitude of the stator induced voltage, and the duration of the three-phase voltage is used as the duration of the stator induced voltage of the unit.
When the excitation system sends an instantaneous excitation voltage to a rotor of the unit, the rotor can establish an excitation magnetic field based on the instantaneous excitation voltage, and in the process of establishing the excitation magnetic field by the rotor, the amplitude of three-phase voltage induced by the stator loop and the duration of the three-phase voltage induced by the stator loop are obtained through the voltage transformer. The duration time of the three-phase voltage induced by the stator loop is the time when the amplitude of the three-phase voltage induced by the stator loop is higher than the amplitude of the rated three-phase voltage in a preset proportion, and the preset proportion can be adjusted according to the actual production condition of the unit. Therefore, the method adds the excitation voltage to the rotor of the unit according to the preset time, and obtains the stator induction voltage amplitude of the unit and the stator induction voltage duration of the unit according to the automatic insulation test of the induced electromotive force formed on the armature winding, thereby providing an effective criterion for engineering application.
In one embodiment, the step of comparing the stator induced voltage amplitude and the stator induced voltage duration with a corresponding voltage threshold and a corresponding time threshold respectively to obtain a comparison result, and opening a unit starting process when the comparison result meets a preset condition includes:
and comparing the stator induction voltage amplitude and the stator induction voltage duration with a corresponding voltage threshold and a corresponding time threshold respectively, and when the stator induction voltage amplitude is greater than or equal to the voltage threshold and the stator induction voltage duration is greater than or equal to the time threshold, meeting a corresponding preset condition and starting a unit process.
The method comprises the steps of obtaining a stator induction voltage amplitude of the unit, obtaining a stator induction voltage duration of the unit, comparing the stator induction voltage amplitude of the unit with a voltage threshold, comparing the stator induction voltage duration of the unit with a time threshold, and when the stator induction voltage amplitude is larger than or equal to the voltage threshold and the stator induction voltage duration is larger than or equal to the time threshold, meeting corresponding preset conditions and opening a unit starting process. Therefore, the method determines that the unit starting process is opened only if the insulation test result is qualified.
In one embodiment, the determining of the voltage threshold includes:
obtaining the maximum leakage current and the minimum insulation resistance of primary equipment of the unit at room temperature from equipment preventive test regulations according to the model of the unit;
and determining the voltage threshold value based on the maximum leakage current, the lowest insulation resistance and a preset safety factor.
The method includes the steps of obtaining maximum leakage current and minimum insulation resistance of primary equipment of a unit at room temperature from equipment preventive test rules according to the model of the unit, obtaining a voltage threshold value based on the obtained maximum leakage current, the obtained minimum insulation resistance and a preset safety factor, specifically multiplying the obtained maximum leakage current, the obtained minimum insulation resistance and the preset safety factor to obtain the voltage threshold value, wherein the preset safety factor is a value which enables the voltage threshold value to be identical to a set rated voltage value of a preset proportion in value, the preset proportion can be 70%, and the preset proportion can be adjusted according to actual conditions due to the fact that different units are different in the actual production process. So that the voltage threshold can be calculated by the above method.
In one embodiment, the time threshold is a discharge time of a primary device of the unit.
The time threshold refers to the discharge time of primary equipment of the unit, and specifically, the time threshold can be set to be 2 seconds according to actual conditions.
In one embodiment, further comprising: and when the amplitude of any phase of stator induction voltage of the stator induction voltage amplitude of the unit is smaller than the voltage threshold, or when the duration of any phase of stator induction voltage of the stator induction voltage duration of the unit is smaller than the time threshold, outputting alarm information.
When any phase of stator induction voltage amplitude of the unit is smaller than a voltage threshold, the locking unit is started and gives an alarm to remind a person on duty, or when any phase of stator induction voltage duration of the unit is smaller than a time threshold, the locking unit is started and gives an alarm to remind the person on duty, and therefore the person on duty can perform preventive work based on alarm information through the method.
In one embodiment, as shown in fig. 3, the operation of guangzhou energy storage hydropower plant #5 unit during 2020 and 11 months is taken as an example for explanation:
firstly, the electronic device can know whether the unit is in a shutdown standby state and whether the unit meets a preset starting condition in the shutdown standby state, specifically, when the #5 unit monitored by the electronic device meets the preset starting condition in the shutdown standby state, that is, each device state of the unit meets the unit starting requirement, for example, the maintenance measures of the primary device and the secondary device of the unit are removed, the service power and the control system thereof supporting the normal operation of the unit are removed, the public device and the control system thereof are in the operation state, the signal for starting each locking unit is reset, the rotating speed of the unit is zero, the outlet switch is opened, each protection of the unit is put into use, and the like, and then the electronic device responds to a starting instruction.
After the electronic equipment responds to a starting command, whether the function of the #5 unit is normally input or not can be detected, and after the function of the #5 unit is normally input, an excitation system of the unit is controlled to send an instantaneous excitation voltage to a rotor of the unit, wherein the function input method of the unit can be a software pressing plate or a hardware pressing plate, the software pressing plate controls the function input of the unit through a software program, the hardware pressing plate controls the function input of the unit through a switch and other physical structures, and in the embodiment, the #5 unit controls the input of the method by adopting the software pressing plate.
When the electronic equipment checks that the function of the unit is normally put into use, the excitation system of the unit is controlled to send instantaneous excitation voltage to the rotor of the unit, specifically, the instantaneous excitation voltage is sent to the rotor of the unit according to preset time by closing the excitation switch, and the situation of short circuit is caused because the stator is likely to generate heat due to the fact that the instantaneous excitation voltage is sent to the rotor suddenly, so that the time for sending the instantaneous excitation voltage to the rotor of the unit needs to be set within a proper range according to the actual situation of the current unit, for example, the excitation duration of the #5 unit can be set to be 1.5 seconds.
After the excitation system is controlled to send the instantaneous excitation voltage to the rotor of the unit, in the process that the rotor establishes an excitation magnetic field based on the instantaneous excitation voltage, the computer control system obtains the amplitude of the three-phase voltage induced by the voltage transformer in the stator loop and the duration of the three-phase voltage induced by the stator loop, takes the amplitude of the three-phase voltage as the amplitude of the stator induced voltage, and takes the duration of the three-phase voltage as the duration of the stator induced voltage of the unit.
And comparing the stator induction voltage amplitude of the unit with a voltage threshold according to the obtained stator induction voltage amplitude and the stator induction voltage duration of the unit, and comparing the stator induction voltage duration of the unit with the time threshold to obtain a comparison result. The voltage threshold may be determined in the following manner: the method comprises the steps of firstly obtaining the maximum leakage current and the minimum insulation resistance of primary equipment of a unit at room temperature from equipment preventive test regulations according to the model of the unit, obtaining a voltage threshold value based on the obtained maximum leakage current, the obtained minimum insulation resistance and a preset safety coefficient, specifically multiplying the obtained maximum leakage current, the obtained minimum insulation resistance and the preset safety coefficient to obtain the voltage threshold value, wherein the preset safety coefficient is a value which can enable the voltage threshold value to be identical to the rated voltage value of the unit in a preset proportion in terms of value, the preset proportion can be 70%, and the preset proportion can be adjusted according to actual conditions due to the fact that different units are different in the actual production process. The time threshold refers to the discharge time of primary equipment of the unit, and specifically, the time threshold can be set to be 2 seconds according to actual conditions.
And determining whether to open the unit starting process or not according to the obtained comparison result. Specifically, when the stator induction voltage amplitude is greater than or equal to the voltage threshold and the stator induction voltage duration is greater than or equal to the time threshold, corresponding preset conditions are met, a unit starting process is opened, and before the unit is started next time, the unit is subjected to insulation test again.
When any phase of stator induction voltage amplitude of the unit is smaller than the voltage threshold, the locking unit is started and sends an alarm to remind a person on duty, or when any phase of stator induction voltage duration of the unit is smaller than the time threshold, the locking unit is started and sends the alarm to remind the person on duty, so that the person on duty can perform preventive work based on the alarm information.
It should be understood that although the various steps in the flow charts of fig. 2-3 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 2-3 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed in turn or alternately with other steps or at least some of the other steps.
In one embodiment, as shown in fig. 4, there is provided an insulation testing apparatus before a unit is started, including: an instantaneous excitation voltage control module 402 and an insulation decision module 404, wherein:
the instantaneous excitation voltage control module 402 is configured to, when the unit meets a preset starting condition in a shutdown standby state, respond to a startup instruction, control an excitation system of the unit to send an instantaneous excitation voltage to a rotor of the unit.
The insulation determination module 404 is configured to obtain a stator induced voltage amplitude of the unit and a stator induced voltage duration of the unit, compare the stator induced voltage amplitude and the stator induced voltage duration with a corresponding voltage threshold and a corresponding time threshold, respectively, obtain a corresponding comparison result, and open a unit starting process when the comparison result meets a corresponding preset condition.
In one embodiment, the instantaneous excitation voltage control module is configured to start the excitation system, turn on the excitation switch, and control the excitation system of the unit to send the instantaneous excitation voltage to the rotor of the unit according to a preset time.
In one embodiment, the insulation determination module is configured to, after the instantaneous excitation voltage control module controls the excitation system to send an instantaneous excitation voltage to the rotor of the unit, acquire, through a voltage transformer, an amplitude of a three-phase voltage induced in a stator loop and a duration of the three-phase voltage induced in the stator loop in a process in which the rotor establishes an excitation magnetic field based on the instantaneous excitation voltage, use the amplitude of the three-phase voltage as the amplitude of the stator induced voltage, and use the duration of the three-phase voltage as the duration of the stator induced voltage of the unit.
In one embodiment, the insulation determination module is configured to compare the stator induced voltage amplitude and the stator induced voltage duration with a corresponding voltage threshold and a corresponding time threshold, respectively, and when the stator induced voltage amplitude is greater than or equal to the voltage threshold and the stator induced voltage duration is greater than or equal to the time threshold, meet a corresponding preset condition and open a unit starting process.
In one embodiment, the insulation determination module includes:
and the stator induction voltage duration setting module is used for setting the duration of the three-phase voltage induced by the stator loop to be the time when the amplitude of the three-phase voltage induced by the stator loop is higher than the rated three-phase voltage amplitude of a preset proportion.
The voltage threshold value determining module is used for obtaining the maximum leakage current and the minimum insulation resistance of the primary equipment of the unit at room temperature from equipment preventive test rules according to the model of the unit; and determining the voltage threshold value based on the maximum leakage current, the minimum insulation resistance and a preset safety factor.
And the time threshold value determining module is used for setting a time threshold value as the discharge time of the primary equipment of the unit.
In one embodiment, the method further comprises the following steps:
and the alarm module is used for outputting alarm information when any phase of stator induction voltage amplitude of the unit is smaller than the voltage threshold value or when any phase of stator induction voltage duration of the unit is smaller than the time threshold value.
For specific limitations of the insulation testing device before the unit is started, reference may be made to the above limitations of the insulation testing method before the unit is started, and details are not described here again. All or part of each module in the insulation testing device before the unit is started can be realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent of a processor in the electronic device, or can be stored in a memory in the electronic device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, an electronic device is provided, which may be a server, and its internal structure diagram may be as shown in fig. 5. The electronic device includes a processor, a memory, and a network interface connected by a system bus. Wherein the processor of the electronic device is configured to provide computing and control capabilities. The memory of the electronic equipment comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The database of the electronic device is used for storing insulation test data. The network interface of the electronic device is used for connecting and communicating with an external terminal through a network. The computer program is executed by a processor to implement a method of insulation testing prior to startup of a unit.
In one embodiment, an electronic device is provided, which may be a terminal, and its internal structure diagram may be as shown in fig. 6. The electronic device comprises a processor, a memory, a communication interface, a display screen and an input device which are connected through a system bus. Wherein the processor of the electronic device is configured to provide computing and control capabilities. The memory of the electronic equipment comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The communication interface of the electronic device is used for carrying out wired or wireless communication with an external terminal, and the wireless communication can be realized through WIFI, an operator network, NFC (near field communication) or other technologies. The computer program is executed by a processor to implement a method of insulation testing prior to startup of a unit. The display screen of the electronic equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the electronic equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the electronic equipment, an external keyboard, a touch pad or a mouse and the like.
It will be understood by those skilled in the art that the configurations shown in fig. 5 and 6 are only block diagrams of some configurations relevant to the present disclosure, and do not constitute a limitation on the electronic devices to which the present disclosure may be applied, and a particular electronic device may include more or less components than those shown in the drawings, or may combine certain components, or have a different arrangement of components.
In one embodiment, an electronic device is provided, which includes a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the insulation testing method before the unit is started.
In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which, when being executed by a processor, carries out the method for insulation testing before start-up of the above-mentioned assembly.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An insulation testing method before a unit is started, which is characterized by comprising the following steps:
when a unit meets a preset starting condition in a shutdown standby state, responding to a starting instruction, and controlling an excitation system of the unit to send an instantaneous excitation voltage to a rotor of the unit;
and obtaining the stator induction voltage amplitude of the unit and the stator induction voltage duration of the unit, comparing the stator induction voltage amplitude and the stator induction voltage duration with corresponding voltage threshold and time threshold respectively to obtain corresponding comparison results, and opening a unit starting process when the comparison results meet corresponding preset conditions.
2. The method of claim 1, wherein controlling the excitation system of the unit to deliver an instantaneous excitation voltage to the rotor of the unit comprises:
and starting the excitation system, closing an excitation switch, and controlling the excitation system of the unit to send instantaneous excitation voltage to the rotor of the unit according to preset time.
3. The method of claim 1, wherein the obtaining the amplitude of the stator induced voltage of the assembly and the duration of the stator induced voltage of the assembly comprises:
after the excitation system is controlled to send the instantaneous excitation voltage to the rotor of the unit, in the process that the rotor establishes an excitation magnetic field based on the instantaneous excitation voltage, the amplitude of three-phase voltage induced in a stator loop and the duration of the three-phase voltage induced in the stator loop are obtained through a voltage transformer, the amplitude of the three-phase voltage is used as the amplitude of the stator induced voltage, and the duration of the three-phase voltage is used as the duration of the stator induced voltage of the unit.
4. The method of claim 3, wherein the duration of the three-phase voltage induced in the stator loop is a time when the magnitude of the three-phase voltage induced in the stator loop is higher than a predetermined percentage of the magnitude of the nominal three-phase voltage.
5. The method according to claim 1, wherein the step of comparing the stator induced voltage amplitude and the stator induced voltage duration with a corresponding voltage threshold and a corresponding time threshold respectively to obtain a comparison result, and opening a unit starting process when the comparison results both satisfy a preset condition comprises:
and comparing the stator induction voltage amplitude and the stator induction voltage duration with a corresponding voltage threshold and a corresponding time threshold respectively, and when the stator induction voltage amplitude is greater than or equal to the voltage threshold and the stator induction voltage duration is greater than or equal to the time threshold, meeting a corresponding preset condition and opening a unit starting process.
6. The method of claim 1, wherein the voltage threshold is determined by:
obtaining the maximum leakage current and the minimum insulation resistance of primary equipment of the unit at room temperature from equipment preventive test regulations according to the model of the unit;
and determining the voltage threshold value based on the maximum leakage current, the minimum insulation resistance and a preset safety factor.
7. The method of claim 6, wherein said determining the voltage threshold based on the maximum leakage current, the minimum insulation resistance, and a preset safety factor comprises:
and determining the voltage threshold value based on the product of the maximum leakage current, the minimum insulation resistance and a preset safety factor.
8. Method according to claim 1, characterized in that said time threshold is the discharge time of a primary device of said unit.
9. The method of claim 1, further comprising:
and when the amplitude of any phase of stator induction voltage of the stator induction voltage amplitude of the unit is smaller than the voltage threshold, or when the duration of any phase of stator induction voltage of the stator induction voltage duration of the unit is smaller than the time threshold, outputting alarm information.
10. An electronic device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor realizes the steps of the method of any of claims 1 to 9 when executing the computer program.
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