CN110514902A - Generator excitation watt insulator resistor detecting device - Google Patents
Generator excitation watt insulator resistor detecting device Download PDFInfo
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- CN110514902A CN110514902A CN201910837329.6A CN201910837329A CN110514902A CN 110514902 A CN110514902 A CN 110514902A CN 201910837329 A CN201910837329 A CN 201910837329A CN 110514902 A CN110514902 A CN 110514902A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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Abstract
This application involves a kind of generator excitation watt insulator resistor detecting devices.The device includes AC power source, resistor detecting device and converting switch device, and AC power source, converting switch device and generator excitation watt insulator are sequentially connected, and resistor detecting device connects AC power source.Converting switch device is for changing the conducting route with generator excitation watt insulator, and resistor detecting device is for detecting the voltage value of AC power source and the current value of conductive line road and the insulating resistance value for carrying out the generator excitation watt insulator that conductive line road is calculated.AC power source is for generating voltage, the frequency of voltage and the frequency of generator speed are different, the device is set only to incude the electric current different from the frequency of generator speed, eliminate interference of the shaft voltage to present apparatus testing result, improve the accuracy of testing result, the value of voltage is less than or equal to the value of generator shaft voltage, and when detection will not cause spark and hydrogen quick-fried, test safety, detects high reliablity.
Description
Technical field
This application involves Generator test equipment technical fields, more particularly to a kind of generator excitation watt insulation bulk resistor
Detection device.
Background technique
Generator, can be because the reasons such as rotor decentraction, rotor remanent magnetism, feel on the big axis of rotor during normal operation
Voltage should be gone out, claim shaft voltage.To limit shaft voltage amplitude, earthing brush often is installed on the inside of vapour side axle watt pedestal, shaft is connect
Ground makes close to zero potential.And end watt is encouraged because bearing shaft voltage, so insulation against ground is arranged in each component such as bearing shell, sealing bearing bush, when exhausted
When edge is too low, shaft voltage forms circulation by encouraging end watt ground connection, causes the damage to the even entire generator of bearing shell, therefore,
It is particularly significant to the insulation resistance detection at excitation watt.
The method of insulating resistance value at traditional detection excitation watt can be by insulation meter or multimeter, however, hair
Hydrogen inside motor may have a small amount of aggregation at excitation watt, when testing insulation values using insulation meter, be applied with hundred to component
The DC voltage of volt may cause spark and cause hydrogen explosion, generates safety accident.And when using multimeter detection, multimeter
Output and shaft voltage it is close, the reading of multimeter can be made to be interfered in this way, reading bounce leads to not correctly show insulation
Value.Therefore, the method detection reliability of the insulating resistance value at traditional detection excitation watt is low.
Summary of the invention
Based on this, it is necessary to which for the method detection of the insulating resistance value at traditional detection excitation watt, reliability is low asks
Topic, provides a kind of generator excitation watt insulator resistor detecting device.
A kind of generator excitation watt insulator resistor detecting device, including AC power source, resistor detecting device and switching are opened
Device is closed, the AC power source connects the converting switch device, the converting switch device connection generator excitation watt insulation
Body, the resistor detecting device connect the AC power source；
The AC power source is for generating voltage, and the frequency of the voltage and the frequency of generator speed are different, the electricity
The value of pressure is less than or equal to the value of the generator shaft voltage, and the converting switch device is for changing exhausted with generator excitation watt
The conducting route of edge body, the resistor detecting device are used to detect the voltage value of the AC power source and the electric current of conductive line road
Value, and the generator excitation watt insulator for carrying out that conductive line road is calculated according to the voltage value and the current value is exhausted
Edge resistance value.
Above-mentioned generator excitation watt insulator resistor detecting device, after accessing generator excitation watt insulator, AC power source
The electric current of generation is greater than zero, and converting switch device for changing the conductive line with generator excitation watt insulator according to actual needs
Road, resistor detecting device be used to detect AC power source voltage value and conducting after current value on route, and according to voltage value and
Current value carries out the insulating resistance value for the generator excitation watt insulator that conductive line road is calculated, the electricity that AC power source generates
The frequency of pressure is different from generator speed frequency, and the device is made only to incude the electric current different from the frequency of generator speed, excludes
Interference of the shaft voltage to present apparatus testing result improves the accuracy of testing result, the value for the voltage that AC power source generates
Less than or equal to the value of generator shaft voltage, when detection, will not cause spark and hydrogen quick-fried, and test safety detects high reliablity.
Detailed description of the invention
Fig. 1 is the structural block diagram of generator excitation watt insulator resistor detecting device in one embodiment；
Fig. 2 is the structure chart of generator in one embodiment；
Fig. 3 is the structural block diagram of generator excitation watt insulator resistor detecting device in another embodiment；
Fig. 4 is the structure chart of generator excitation watt insulator resistor detecting device in one embodiment；
Fig. 5 is the structural block diagram of generator excitation watt insulator resistor detecting device in another embodiment.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, by the following examples, it and combines attached
Figure, is described more fully the present invention.It should be appreciated that specific embodiment described herein is only to explain this hair
It is bright, it is not intended to limit the present invention.
In one embodiment, referring to Figure 1, a kind of generator excitation watt insulator resistor detecting device, the dress are provided
It sets including AC power source 110, resistor detecting device 130 and converting switch device 120, the connection switching switch dress of AC power source 110
120 are set, converting switch device 120 connects generator excitation watt insulator 210, and resistor detecting device 130 connects AC power source
110.Converting switch device 120 is for changing the conducting route with generator excitation watt insulator 210, resistor detecting device 130
For detecting the voltage value of AC power source 110 and the current value of conductive line road, and calculated according to voltage value and current value
Obtain the insulating resistance value of the generator excitation watt insulator 210 of conductive line road.AC power source 110 is for generating voltage, electricity
The frequency of pressure and the frequency of generator speed are different, and the device is made only to incude the electric current different from the frequency of generator speed, row
Interference in addition to shaft voltage to present apparatus testing result, improves the accuracy of testing result, and the value of voltage is less than or equal to hair
The value of motor shaft voltage, when detection, will not cause spark and hydrogen quick-fried, and test safety detects high reliablity.
Specifically, in the present embodiment, generator can be steam turbine generator, and steam turbine generator is to make former move by steam turbine
Machine drags rotor rotation, and the generating equipment of electric energy is converted mechanical energy into using electromagnetic induction principle.The part of steam turbine generator
Structure as shown in Fig. 2, include set gradually high intermediate pressure cylinder, No. 1 low pressure (LP) cylinder, No. 2 low pressure (LP) cylinders, generator, exciter rotor and
Exciter stator is provided with thrust bearing shoe valve between each cylinder, and the thrust bearing shoe valve between generator and exciter rotor is known as excitation watt,
Thrust bearing shoe valve between generator and No. 2 low pressure (LP) cylinders is referred to as vapour side axle watt.Generator, can be because of rotor during normal operation
The reasons such as decentraction, rotor remanent magnetism induce voltage on the big axis of rotor, claim shaft voltage.To limit shaft voltage amplitude, in vapour side
Big axis sets axis grounding carbon brush at bearing shell, makes at vapour side axle watt big axis close to zero potential, and vapour side axle watt holds seat and do not need setting insulation,
Only have one layer of oil film insulation between ground.End watt is encouraged because bearing shaft voltage, so each component setting such as bearing shell, sealing bearing bush is exhausted over the ground
Edge, to prevent shaft voltage from damaging bearing shell and encouraging end watt ground connection and forming circulation.However, the insulation system at excitation watt is broken
It is bad, when insulation resistance is too low, insulation cannot be played the role of, shaft voltage forms circulation by encouraging end watt ground connection, causes to bearing shell
The damage of even entire generator, it is therefore desirable to the insulating resistance value at excitation watt be detected, prevention and in time discovery
Failure avoids insulation fault from damaging generator.
AC power source 110 is for generating voltage, and the frequency of voltage and the frequency of generator speed are different, AC power source 110
The electric voltage frequency of generation be not it is unique, as long as the frequency from generator speed is different, further, AC power source
110 electric voltage frequencies generated should be also not identical as the multiple of the frequency of generator speed, to improve the accuracy of testing result.Example
Such as, the speed-frequency of common generator has 25Hz and 50Hz etc., and multiple includes 75,100Hz etc., at this time AC power source 110
The frequency of the voltage of generation can be 33Hz, incude generator excitation watt insulator resistor detecting device only and generator speed
The different electric current of frequency, eliminate interference of the shaft voltage to the device testing result, improve the accuracy of testing result.It hands over
The voltage swing that galvanic electricity source 110 generates is also not uniquely, such as can be 2V, the shaft voltage that generator generates when operating normally
About 3V, the value for the voltage that AC power source 110 generates are less than or equal to the value of generator shaft voltage, and when detection will not cause fire
Colored and hydrogen is quick-fried, and test safety detects high reliablity.It is appreciated that in other embodiments, the voltage that AC power source 110 generates
Frequency and voltage value may be other numerical value, as long as those skilled in the art think may be implemented.
Converting switch device 120 is for changing the conducting route with generator excitation watt insulator 210, resistor detecting device
130 for detecting the voltage value of AC power source 110 and the current value of conductive line road, and is counted according to voltage value and current value
It calculates and obtains the insulating resistance value of the generator excitation watt insulator 210 of conductive line road, generate electricity when converting switch device 120 connects
When the different location of machine excitation watt insulator 210, the route of conducting is different, and resistor detecting device 130 is according to conducting route
Difference detection obtains the insulating resistance value of the generator excitation watt insulator 210 of different location.The structure of converting switch device 120
It is not unique, such as can is relay, the movable contact of relay is separately connected generator excitation watt insulator 210 not
Same position, according to the different conditions of relay coil, stationary contact is connected with the movable contact of connection different insulative body position, to change
With the conducting route of generator excitation watt insulator 210.According to the various combination of the energized state control switch of coil, switching side
Just, the automatic control of conducting route may be implemented.It is appreciated that in other embodiments, converting switch device 120 can also be adopted
With the device of other structures, as long as those skilled in the art think may be implemented.The structure of resistor detecting device 130 is not yet
It is unique, such as can is resistance meter, resistance meter is easy to operate, and type is abundant, can meet under a variety of occasions
Demand.It is appreciated that in other embodiments, resistor detecting device 130 can also use other kinds of device, as long as ability
Field technique personnel think may be implemented.
In one embodiment, Fig. 3 is referred to, generator excitation watt insulator resistor detecting device further includes current limiting device
140, AC power source 110 connects converting switch device 120 by current limiting device 140.Current limiting device 140 is for limiting conducting route
In size of current, avoid electric current is excessive from damaging to device.
Specifically, when the electric current mistake that the insulation of generator excitation watt insulator 210 is destroyed or AC power source 110 exports
When big, can all there be biggish electric current in circuit, electric current crosses the component in conference damage circuit and the device with circuit connection,
Current limiting device 140 is set between AC power source 110 and converting switch device 120, be can reduce the size of current in circuit, is mentioned
The security performance of high generator excitation watt insulator resistor detecting device.The type of current limiting device 140 is not unique, such as
It can be current-limiting resistance R, current-limiting resistance R connects with Switching Power Supply and converting switch device 120, the electricity for circuit where limiting
Flow size, current-limiting resistance R structure is simple, can save generator excitation watt insulator resistor detecting device production and use at
This.The size of current limited as needed is different, and the resistance value of current-limiting resistance R is different, and model is also different, current-limiting resistance R resistance
It is abundant to be worth specification, it is applied widely.In the present embodiment, the resistance value of current-limiting resistance R is selected according to the electric current after current limliting no more than 1A
It selects, it will be understood that in other embodiments, also can choose the current-limiting resistance R of other different resistance values, with specific reference to actual demand
It determines.
In one embodiment, Fig. 4 is referred to, converting switch device 120 is multi-gear switch, generator excitation watt insulator
210 include oil film insulator 211 and bearing insulation body 212, and the quantity of oil film insulator 211 and bearing insulation body 212 is
Two or more, multi-gear switch connects current limiting device 140, and connects corresponding oil film insulator 211 and bearing insulation body
212 common end.Multi-gear switch can switch common end and the current limliting of different oil film insulator 211 and bearing insulation body 212
Device 140 is connected, convenient for the resistance value of the common end of the subsequent oil film insulator 211 and bearing insulation body 212 to conductive line road
Measurement.
Specifically, the quantity of oil film insulator 211 and bearing insulation body 212 is two or more, it is exhausted with oil film
The quantity of edge body 211 and bearing insulation body 212 is for four, oil film insulator 211 include the equivalent insulation of the first Seal Oil,
The equivalent insulation of second Seal Oil, the equivalent insulation of the first lubricating oil and the equivalent insulation of the second lubricating oil, bearing insulation body 212 include interior
Oily shelves insulation, sealing bearing bush insulation, bearing shell insulation and outer oily shelves insulation, multi-gear switch connects current limiting device 140, and it is close to connect first
The common end of the equivalent insulation of oil sealing and interior oily shelves insulation, the equivalent common end insulated with sealing bearing bush, first of insulating of the second Seal Oil
The common end of the equivalent insulation of lubricating oil and the common end of bearing shell insulation or the equivalent insulation of the second lubricating oil and outer oily shelves insulation, to survey
The resistance value for measuring the insulator of four different common end connections, positions convenient for the specific location to insulation fault, improves
The detection accuracy of generator excitation watt insulator resistor detecting device.
In one embodiment, multi-gear switch includes stationary contact and movable contact, the quantity of movable contact be two or two with
On, stationary contact connects current limiting device 140, and each movable contact is separately connected corresponding oil film insulator 211 and bearing insulation body 212
Common end.Stationary contact by changing multi-gear switch is connected from different movable contacts, can switch different oil film insulators 211
It is connected with the common end of bearing insulation body 212 and current limiting device 140, convenient for the subsequent oil film insulator 211 to conductive line road
With the measurement of the resistance value of the common end of bearing insulation body 212.
Specifically, the quantity of movable contact is not unique, each movable contact be separately connected corresponding oil film insulator 211 with
The quantity of the common end of bearing insulation body 212, movable contact can be less than, greater than or equal to oil film insulator 211 and bearing insulation
The quantity of the common end of body 212, when the quantity of movable contact is less than the common end of oil film insulator 211 and bearing insulation body 212
When quantity, it is connect by changing different common ends with movable contact when measurement, then the movable contact is connected with stationary contact and can be risen
To the purpose of the insulating resistance value of the insulator of the corresponding different location in the different common ends of measurement, movable contact quantity is few, Ke Yijie
About use cost.When the quantity of movable contact is equal to the quantity of the common end of oil film insulator 211 and bearing insulation body 212, one
A movable contact is correspondingly connected with the common end of an oil film insulator 211 and bearing insulation body 212, and when use need to only change stationary contact
The insulating resistance value that the insulator of the corresponding different location in different common ends can be measured from different movable contact conductings, is not necessarily to
In addition it is routed, it is easy to use.When the quantity of movable contact is greater than the number of the common end of oil film insulator 211 and bearing insulation body 212
When amount, other than each oil film insulator 211 is separately connected different movable contacts from the common end of bearing insulation body 212,
Other different function can be set in his movable contact, keep the function of generator excitation watt insulator resistor detecting device more, fit
It is more with occasion.
In the present embodiment, the common end of oil film insulator 211 and bearing insulation body 212 is greater than with the quantity of movable contact
For quantity, the quantity of movable contact is five, and the quantity of the common end of oil film insulator 211 and bearing insulation body 212 is four,
Oil film insulator 211 includes the equivalent insulation of the first Seal Oil, the equivalent insulation of the second Seal Oil, the equivalent insulation of the first lubricating oil and the
The equivalent insulation of two lubricating oil, bearing insulation body 212 includes interior oily shelves insulation, sealing bearing bush insulation, bearing shell insulate and outer oily shelves insulation,
Specifically, sealing bearing bush insulation includes sealing bearing bush transition rings interior insulation and sealing bearing bush transition rings external insulation, and bearing shell insulation includes bearing shell
Common end, the sealing bearing bush transition rings interior insulation of interior insulation and bearing shell external insulation, the equivalent insulation of the first Seal Oil and interior oily shelves insulation
It is equivalent with the common end of sealing bearing bush transition rings external insulation, bearing shell interior insulation and the common end of bearing shell external insulation and the second lubricating oil
Insulation and the common end of outer oily shelves the insulation movable contact that be separately connected four different, when stationary contact and different movable contact conductings
When, the insulating element that movable contact is correspondingly connected with can be accessed generator excitation watt insulator resistor detecting device, to measure difference
Insulating element insulating resistance value, movable contact further includes exiting a movable contact, and when stationary contact is with exiting position and being connected, circuit is disconnected
It opens, generator excitation watt insulator resistor detecting device stops working, convenient for there are abnormal or other emergency cases in equipment
When stop the working condition of generator excitation watt insulator resistor detecting device in time, play the role of protective device, and operate
It is convenient.It is appreciated that in other embodiments, the position of the insulator of movable contact connection may be other positions, with measurement
The insulating resistance value of other insulating elements, as long as those skilled in the art think may be implemented.
In one embodiment, Fig. 4 is referred to, generator excitation watt insulator resistor detecting device further includes controller
150, multi-gear switch further includes automatic position movable contact, and automatic position movable contact connects controller 150, and controller 150 is also connected with oil film
The common end of insulator 211 and bearing insulation body 212, when stationary contact is connected with automatic position movable contact, the control of controller 150 is certainly
Dynamic position movable contact is connected with common end.When multi-gear switch includes automatic position movable contact, multi-gear switch and controller are all connected with oil film
The common end of insulator 211 and bearing insulation body 212, multi-gear switch includes automatically and manually two kinds of test patterns, when multi gear is opened
When pass is MANUAL CONTROL mode, tester, which can pass through, changes stationary contact and different movable contact conductings, so that it may measurement difference
The insulating resistance value of the insulator of the corresponding different location in common end, it is easy to use without in addition wiring.When multi-gear switch is hand
When dynamic control model, it is whether public with oil film insulator 211 and bearing insulation body 212 that multi-gear switch is controlled by controller 150
End conducting, when conducting, generator excitation watt insulator resistor detecting device detects the insulated electro of generator excitation watt insulator 210
Resistance value, when disconnection, generator excitation watt insulator resistor detecting device stops working, and improves generator excitation watt insulator electricity
Hinder the degree of automation of detection device.When the quantity of oil film insulator 211 and bearing insulation body 212 is two or more
When, by taking the quantity of oil film insulator 211 and bearing insulation body 212 is four as an example, four common ends are all connected with controller
150, when the stationary contact of multi-gear switch is connected with automatic position movable contact, controller 150 is according to presetting operating condition control
Automatic position movable contact is connected with common end, and preset operating conditions are not unique, such as can be default operating time, automatically
Position movable contact be connected with one of common end reach preset duration after automatically switch to automatic position movable contact with it is next public
End conducting, improves testing efficiency, it will be understood that and in other embodiments, preset operating conditions may be other conditions, as long as
Those skilled in the art think may be implemented.The type of controller 150 is not unique, such as can be PLC
(Programmable Logic Controller, programmable logic controller (PLC)), the input/output function module of PLC is complete,
For different on-site signals (such as direct current or exchange, switching value, digital quantity or analog quantity, voltage or electric current), have corresponding
Template can be direct with the device (such as button, switch, sense current transmitter, motor starter or control valve) of industry spot
Connection, and program and be easy, integrated level is high, easy to use.It is appreciated that in other embodiments, controller 150 can also use
Other kinds of device, as long as being able to achieve corresponding control function.
In one embodiment, controller 150 is also used to receive the axis current signal of generator, and controller 150 is receiving
To the value of shaft current be greater than default shaft current threshold value when control automatic position movable contact and be connected with common end.The value of shaft current is greater than
When default shaft current threshold value, it is believed that exception occurs in generator work, and controller 150 controls automatic position movable contact and common end at this time
Conducting, makes generator excitation watt insulator resistor detecting device can detecte the insulation resistance of generator excitation watt insulator 210
Value, finds insulation fault in time.
Specifically, steam turbine generator, can be because the reasons such as steam and blade, cylinder friction generate directly during normal operation
Induced electricity is flowed, high intermediate pressure cylinder, No. 1 low pressure (LP) cylinder, No. 2 low pressure (LP) cylinders and big axis are grounded, so that the usual amplitude very little of induced voltage, no
Oil film can be punctured, therefore the bearing shell bearing that high intermediate pressure cylinder, No. 1 low pressure (LP) cylinder and No. 2 low pressure (LP) cylinder two sides is arranged in does not set bearing housing
Insulation is set, only has one layer of oil film insulation between big axis and ground.Double winding formula is installed on the big axis earth cable at vapour side axle watt
For current transformer with the earth current of the entire shafting of precise measurement, i.e. shaft current, whether Lai Fanying shafting has second grounding point
Shaft voltage or induced current is set to form circulation.Double winding formula current transformer is connect with controller 150, and controller 150 is used for
The axis current signal that double winding formula current transformer is sent is received, controller 150 is greater than default in the value of the shaft current received
When shaft current threshold value, it is believed that exception occurs in generator work, and controller 150 controls automatic position movable contact and leads with common end at this time
It is logical, so that generator excitation watt insulator resistor detecting device is can detecte the insulating resistance value of generator excitation watt insulator 210,
Discovery insulation fault in time.The value of default shaft current threshold value is not unique, such as can be 2A, when controller 150 connects
The value of the shaft current received controls automatic position movable contact when being greater than 2A and is connected with common end.Alternatively, default shaft current threshold value can also
It is 0.2A with current threshold both to include current threshold and time threshold, for time threshold is 10s, when the axis electricity received
Greater than 0.2A and when the duration is 10s or more, controller 150 controls automatic position movable contact and is connected with common end the value of stream, makes
Generator excitation watt insulator resistor detecting device can detecte the insulating resistance value of generator excitation watt insulator 210, in time
It was found that insulation fault.It is appreciated that in other embodiments, presetting shaft current threshold value may be other values, as long as ability
Field technique personnel think may be implemented.
In one embodiment, Fig. 4 is referred to, resistor detecting device 130 includes voltmeter 131, ammeter 132 and voltage
Current processing unit 133, voltmeter 131 is in parallel with AC power source 110, and 132 one end of ammeter connects AC power source 110, another
End ground connection, voltmeter 131 and ammeter 132 are all connected with voltage and current processing unit 133, and voltage and current processing unit 133 is used for
Obtained voltage value is detected according to voltmeter 131 and ammeter 132 detects obtained current value and conductive line road is calculated
The insulating resistance value of generator excitation watt insulator 210.
Specifically, voltmeter 131 is used to detect the voltage of 110 two sides of AC power source, and ammeter 132 is for detecting conducting
Current value on route, voltage and current processing unit 133 are used to that conducting to be calculated according to the voltage value and current value that receive
The insulating resistance value of generator excitation watt insulator 210 on route.Resistance value is calculated in voltage and current processing unit 133
Mode be not it is unique, when the voltage received is Ui, and the electric current received is Ii, voltage and current processing unit 133
Input impedance Zi is obtained according to Ui/Ii, the insulation resistance that vector calculates available generator excitation watt insulator 210 is carried out to Zi
Value.When being connected in route further includes current-limiting resistance R, after input impedance Zi is calculated in voltage and current processing unit 133, to Zi
It carries out vector operation and subtracts the resistance value of cut-off current, so that it may the insulating resistance value of generator excitation watt insulator 210 is obtained,
It, can be by simply counting when resistor detecting device 130 includes voltmeter 131, ammeter 132 and voltage and current processing unit 133
Calculation obtains the insulating resistance value of generator excitation watt insulator 210, easy to use.Controller 150, which can also store, to be calculated
Each measured value carries out data analysis and breakdown judge etc. using calculating data so that staff is subsequent.
In one embodiment, Fig. 4 is referred to, generator excitation watt insulator resistor detecting device further includes fuse
160,160 one end of fuse connects ammeter 132, other end ground connection.Fuse 160 is used to disconnect when electric current is more than preset value
Circuit avoids high current from damaging the device in circuit.
Specifically, 160 one end of fuse connects ammeter 132, other end ground connection.When generator excitation watt insulation bulk resistor
When the electric current of detection device conductive line road transmission is more than preset value, fuse 160 makes melt fuse with the heat that itself is generated,
To disconnecting circuit, the device in the excessive damage circuit of electric current and the component with circuit connection are avoided, overcurrent protection is played
Effect.Preset value be fuse 160 allow by current maxima, according to allow by current maxima difference, melt
The type of disconnected device 160 is also different, the fuse 160 of corresponding model can be selected according to the current maxima in circuit, as long as energy
Play the role of overcurrent protection.Fuse 160 is applied to can in generator excitation watt insulator resistor detecting device
Effectively to extend the service life of device, and 160 structure of fuse is simple, easy to use.
In one embodiment, figure is referred to, generator excitation watt insulator resistor detecting device further includes frequency selection circuit
170, AC power source 110 connects converting switch device 120 by frequency selection circuit 170.Frequency selection circuit 170 allow specific frequency
Voltage signal passes through, and filters out the signal of other frequencies, is conducive to the purity for improving signal, to guarantee that generator excitation watt insulate
The working performance of bulk resistor detection device.The frequency for the voltage that the reserve frequency of frequency selection circuit 170 is generated according to AC power source 110
It determines, for example, frequency selection circuit 170 allow frequency to be 33Hz's when the frequency for the voltage that AC power source 110 generates is 33Hz
Voltage signal passes through, and to exclude interference of the shaft voltage to this detection device, improves the accuracy of testing result.
In one embodiment, Fig. 4 is referred to, frequency selection circuit 170 includes inductance L and capacitor C, AC power source 110 and electricity
Sense L, capacitor C and converting switch device 120 are sequentially connected.When frequency selection circuit 170 includes inductance L and capacitor C, structure is simple, holds
It easily realizes, the impedance magnitude of frequency selection circuit 170 is related with input voltage frequency, i.e., the output voltage frequency with AC power source 110
Correlation, when the output voltage frequency of AC power source 110 is equal to the resonance frequency of frequency selection circuit 170, the impedance of frequency selection circuit 170
Minimum, the electric current for then flowing through frequency selection circuit 170 is maximum, this resonance frequency be exactly frequency selection circuit 170 can by signal
Frequency, when the electric voltage frequency that AC power source 110 generates is 33Hz, the resonance frequency of frequency selection circuit 170 is 33Hz, i.e., only allows
Frequency is that the current signal of 33Hz passes through, to reduce influence of the shaft voltage to testing result.
In one embodiment, Fig. 5 is referred to, generator excitation watt insulator resistor detecting device further includes display device
180, display device 180 connects resistor detecting device 130, encourages for showing that resistor detecting device 130 detects obtained generator
The insulating resistance value of magnetic shoe insulator 210.The information shown by display device 180 can intuitively obtain generator excitation watt
The insulating resistance value of insulator 210, convenient for understanding the state of insulation of generator excitation watt insulator 210 in real time.
Specifically, the concrete type of display device 180 is not unique, such as can be display screen, and display screen can be with
The resistance value information that resistor detecting device 130 sends over is shown that user can pass through display in a manner of numerical value or chart etc.
Screen is intuitive to obtain information.Display device 180 can also be touch screen, and touch screen includes display screen and touch screen, and display screen is used for
Show information, human-computer interaction may be implemented in touch screen, and staff can send by touch screen and instruct, and touch screen will receive
Instruction be sent to resistor detecting device 130, resistor detecting device 130 is according to the instruction works received, such as when starts
When stop.Display device 180 can also include warning light, mention information by the color or flashing state of warning light and mention
The effect shown, it is at low cost, it is easy to use.
12 in one embodiment, refers to Fig. 5, and generator excitation watt insulator resistor detecting device further includes alarm dress
190 are set, warning device 190 connects resistor detecting device 130, the generator excitation watt that resistor detecting device 130 is obtained in detection
The insulating resistance value of insulator 210 issues alarm signal to warning device 190 and alarms when being less than preset resistance threshold value, to remind work
Make personnel to handle in time, improves the reliability of generator excitation watt insulator resistor detecting device.
Specifically, the structure of warning device 190 is not unique, such as may include warning light and buzzer, and warning light can
With by the function of the realizations such as the color of lamp or flashing state alarm, buzzer can realize the function of alarm by alarm song,
To remind staff to handle in time, the reliability of generator excitation watt insulator resistor detecting device is improved.Work as resistance detection
When the insulating resistance value that device 130 detects obtained generator excitation watt insulator 210 is less than preset resistance threshold value, it is believed that power generation
The insulation resistance of machine excitation watt insulator 210 is too low, and insulation effect is poor, and resistor detecting device 130 sends warning message extremely at this time
Warning device 190, warning device 190 realize the function of alarm by structures such as warning light or buzzers, play warning work people
The effect of member.
In one embodiment, generator excitation watt insulator resistor detecting device further includes communication device, resistance detection
Device 130 and controller 150 are all connected with communication device.User can be detected resistor detecting device 130 by communication device
To insulating resistance value be sent to terminal device, user can also pass through communication device and send operational order to controller 150, control
Device 150 processed, which receives, to be controlled automatic position movable contact after operational order and is connected with common end, is realized to generator excitation watt insulator
The long-range control of resistor detecting device.
Specifically, the structure of communication device is not unique, such as may include WIFI device and/or blue-tooth device,
Communication device can be established with user terminal or cloud platform and be communicated to connect, and realize data transmission with APP corresponding on user terminal,
Or data exchange is carried out with cloud platform.The interface type of communication device is not unique, for example, can for UART, SPI, USB,
WIFI, RF or blue tooth interface etc. can be adjusted, using flexible according to actual needs.By taking APP corresponding on user terminal as an example, lead to
The resistance information that resistor detecting device 130 sends over is sent to the user terminal by T unit, and the APP on user terminal is to these
Information carries out information record, handles convenient for subsequent analysis.User can also preset running parameter on the subscriber terminal, and APP will
Running parameter is sent to communication device and operating parameter information is sent to control after communication device receives and analyzes processing information
Device 150 controls automatic position movable contact by controller 150 and is connected with which common end, and the duration of conducting is how many, realizes intelligence
It can detect, solve the problems such as common end for needing to manually adjust connection in detection process, improve generator excitation watt insulation
The use reliability of bulk resistor detection device.
Above-mentioned generator excitation watt insulator resistor detecting device, after accessing generator excitation watt insulator 210, alternating current
The electric current that source 110 generates is greater than zero, and converting switch device 120 for changing and generator excitation watt insulator according to actual needs
210 conducting route, resistor detecting device 130 be used to detect AC power source 110 voltage value and conducting after electric current on route
Value, and the insulated electro for the generator excitation watt insulator 210 for according to voltage value and current value carrying out that conductive line road is calculated
The frequency of resistance value, the voltage that AC power source 110 generates is different from generator speed frequency, incudes the device only and turns with generator
The different electric current of the frequency of speed, eliminates interference of the shaft voltage to present apparatus testing result, improves the accuracy of testing result,
The value for the voltage that AC power source 110 generates is less than or equal to the value of generator shaft voltage, and when detection will not cause spark and hydrogen quick-fried,
Test safety, detects high reliablity.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (12)
1. a kind of generator excitation watt insulator resistor detecting device, which is characterized in that including AC power source, resistor detecting device
And converting switch device, the AC power source connect the converting switch device, the converting switch device connection generator is encouraged
Magnetic shoe insulator, the resistor detecting device connect the AC power source；
For the AC power source for generating voltage, the multiple of frequency of frequency and generator speed of the voltage is different, described
The value of voltage be less than or equal to the generator shaft voltage value, the converting switch device for changing with generator excitation watt
The conducting route of insulator, the resistor detecting device are used to detect the voltage value of the AC power source and the electricity of conductive line road
Flow valuve, and the generator excitation watt insulator for carrying out that conductive line road is calculated according to the voltage value and the current value
Insulating resistance value.
2. the apparatus according to claim 1, which is characterized in that further include current limiting device, the AC power source passes through described
Current limiting device connects the converting switch device.
3. the apparatus of claim 2, which is characterized in that the converting switch device is multi-gear switch, the power generation
Machine excitation watt insulator includes oil film insulator and bearing insulation body, and the number of the oil film insulator and the bearing insulation body
Amount is two or more, and the multi-gear switch connects the current limiting device, and connects corresponding oil film insulator and axis
Hold the common end of insulator.
4. device according to claim 3, which is characterized in that the multi-gear switch includes stationary contact and movable contact, described
The quantity of movable contact is two or more, and the stationary contact connects the current limiting device, and each movable contact is separately connected correspondence
Oil film insulator and bearing insulation body common end.
5. device according to claim 4, which is characterized in that further include controller, the multi-gear switch further includes automatic
Position movable contact, the automatic position movable contact connect the controller, the controller be also connected with the oil film insulator with it is described
The common end of bearing insulation body；When the stationary contact is connected with the automatic position movable contact, the controller control is described certainly
Dynamic position movable contact is connected with the common end.
6. device according to claim 5, which is characterized in that the controller is also used to receive the shaft current letter of generator
Number, the controller controls the automatic position movable contact when the value of the shaft current received is greater than default shaft current threshold value
It is connected with the common end.
7. the apparatus according to claim 1, which is characterized in that the resistor detecting device include voltmeter, ammeter and
Voltage and current processing unit, the voltmeter is in parallel with the AC power source, and described ammeter one end connects the AC power source,
Other end ground connection, the voltmeter and the ammeter are all connected with the voltage and current processing unit, the voltage and current processing
The current value that the voltage value and the ammeter that unit is used to be detected according to the voltmeter detect, which is calculated, leads
The insulating resistance value of generator excitation watt insulator on logical route.
8. device according to claim 7, which is characterized in that further include fuse, described in fuse one end connection
Ammeter, other end ground connection.
9. the apparatus according to claim 1, which is characterized in that further include frequency selection circuit, the AC power source passes through described
Frequency selection circuit connects the converting switch device.
10. device according to claim 9, which is characterized in that the frequency selection circuit includes inductance and capacitor, the exchange
Power supply is sequentially connected with the inductance, the capacitor and the converting switch device.
11. device described in -10 any one according to claim 1, which is characterized in that it further include display device, the display
Device connects the resistor detecting device, for showing that the generator excitation watt that the resistor detecting device detects is exhausted
The insulating resistance value of edge body.
12. device described in -10 any one according to claim 1, which is characterized in that it further include warning device, the alarm
Device connects the resistor detecting device, and the resistor detecting device is detecting the obtained generator excitation watt insulator
Alarm signal to the warning device is issued when insulating resistance value is less than preset resistance threshold value to alarm.
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| CN201910837329.6A CN110514902B (en) | 2019-09-05 | 2019-09-05 | Generator excitation shoe insulator resistance detection device |
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| CN111983325A (en) * | 2020-07-03 | 2020-11-24 | 中广核核电运营有限公司 | Method and device for measuring resistance value of generator sealing tile by current time method |
| CN111983324A (en) * | 2020-07-03 | 2020-11-24 | 中广核核电运营有限公司 | Method and device for measuring resistance value of generator sealing tile by equipotential method |
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