CN108983096A - A kind of high-tension motor power determining method and measuring device - Google Patents
A kind of high-tension motor power determining method and measuring device Download PDFInfo
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- CN108983096A CN108983096A CN201810843014.8A CN201810843014A CN108983096A CN 108983096 A CN108983096 A CN 108983096A CN 201810843014 A CN201810843014 A CN 201810843014A CN 108983096 A CN108983096 A CN 108983096A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/06—Arrangements for measuring electric power or power factor by measuring current and voltage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
- G01R31/343—Testing dynamo-electric machines in operation
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Abstract
The present invention discloses a kind of high-tension motor power determining method and measuring device, and the connection line of high-tension motor and high voltage bus is equipped with generator terminal protected level current transformer and generator terminal measures grade current transformer, and high voltage bus is equipped with bus-bar potential transformer.The present invention obtains secondary side current, the secondary side current of generator terminal protected level current transformer and the secondary voltage data of bus-bar potential transformer of generator terminal measurement grade current transformer first；Then the related electric characteristic quantity of voltage and current is calculated；Motor double measurement power and motor second protection power are calculated separately again；Finally judge whether motor is in start-up course or unusual service condition based on electric characteristic amount: if motor is accidental conditions, it is determined that the output power of motor is double measurement power；Otherwise the output power for determining motor is second protection power.The present invention can solve the problems, such as that power calculation discrepancy is larger under starting process of motor and unusual service condition.
Description
Technical field
The present invention relates to relay protection of power system and its technical field of automatic control, especially a kind of high-tension motor
Power determining method and measuring device.
Background technique
With the increasingly raising of Automation of Electric Systems degree, some industrial and mining enterprises more using high-tension motor are pacified
Motor protection measure and control device has been filled, and has accessed factory's domain electric automatization monitoring system.To meet motor measurement control need
It asks, is mounted with one group of measurement grade current transformer in high-tension motor generator terminal.Measurement grade current transformer generally uses 0.5 grade, i.e.,
Measurement accuracy is 0.5%, it is desirable that has higher accuracy under normal current, it is accurate to make measurement, but when primary current is larger
Measurement grade current transformer core is easily saturated, so that secondary side current value be made not increase by no-load voltage ratio accordingly, causes to calculate function
There is very big deviation in rate, and the motor for participating in closed-loop control for power has larger impact, is easy to cause mistakenly stop machine.Protected level electricity
Current transformer relative measurement grade current transformer precision is slightly poor, but anti-saturation characteristic is good, and the good faults electric current of energy is simultaneously protected
Two sub-values are demonstrate,proved in certain error range.
In light of this situation, it is necessary to which a kind of method for studying precise measurement motor power (output) is operated normally surely with meeting
The measurement error of transient state, overcomes the function of existing motor protection measure and control device the power accuracy of state can guarantee failure or disturbance again when
It can defect.
Summary of the invention
It is an object of the present invention to provide a kind of high-tension motor power determining method and measuring devices, solve motor and open
The larger problem of power calculation discrepancy under dynamic process and unusual service condition.
The technical solution of the present invention is as follows: a kind of high-tension motor power determining method, high-tension motor and high voltage bus
Connection line is equipped with generator terminal protected level current transformer and generator terminal measures grade current transformer, and high voltage bus is equipped with bus
Voltage transformer；
Method includes:
S1 obtains the secondary side current of generator terminal measurement grade current transformer, the secondary side of generator terminal protected level current transformer
The secondary voltage data of electric current and bus-bar potential transformer；
S2 calculates busbar voltage, generator terminal three-phase protective electric current and generator terminal three-phase measurement electric current based on the data that S1 is obtained
Electric characteristic amount；
S3, the secondary side electricity based on the S1 generator terminal measurement grade current transformer and generator terminal protected level current transformer obtained
The secondary voltage of stream and bus-bar potential transformer, calculates separately to obtain motor double measurement power and the secondary guarantor of motor
Protect power；
S4, the electric characteristic amount based on the S2 generator terminal three-phase protective electric current being calculated and generator terminal three-phase measurement electric current, sentences
Whether power-off motivation is in start-up course or unusual service condition:
If motor is in accidental conditions, the output power of motor is double measurement power；
If motor is in start-up course or is abnormal operating condition, the output power of motor is second protection function
Rate.
Further, the method for the present invention further include:
S5, the electric characteristic amount based on the S2 busbar voltage being calculated and generator terminal three-phase protective electric current judge bus electricity
Whether pressure mutual inductor occurs secondary break, if then the output power of motor is defeated before bus-bar potential transformer secondary break
Performance number out, until broken string abnormal disappearance, then revert to double measurement power or second protection power according to the judgement of S4 again
Value.
Further, the method for the present invention further include:
S6 is based respectively on the electric characteristic amount that generator terminal three-phase measurement electric current and generator terminal three-phase protective electric current is calculated in S2,
Judge whether generator terminal measurement grade current transformer and generator terminal protected level current transformer occur secondary break:
If generator terminal measures grade Current Transformer Secondary broken string, generator terminal protected level current transformer is normal, then motor is defeated
Power is second protection power out；
If secondary break also occurs for generator terminal protected level current transformer after generator terminal measures grade Current Transformer Secondary broken string,
Then the output power of motor is the output power value before generator terminal protected level Current Transformer Secondary broken string.Abnormal disappearance to be broken
Afterwards, can restore output power according to S4 is double measurement power or second protection performance number.
Specifically, the electric characteristic amount of busbar voltage includes bus positive sequence voltage and bus negative sequence voltage, generator terminal three-phase is surveyed
The electric characteristic amount for measuring electric current includes measurement three-phase current fundamental wave virtual value, measurement current zero sequence current value, measurement three-phase current
DC component, measurement three-phase current second harmonic virtual value and measurement three-phase current triple-frequency harmonics virtual value；Generator terminal three-phase protective
The electric characteristic amount of electric current includes protection three-phase current fundamental wave virtual value and protective current zero-sequence current value.
Preferably, in S5, the criterion of secondary break occurs for bus-bar potential transformer are as follows:
1) bus negative sequence voltage is greater than preset negative sequence voltage threshold value；Negative sequence voltage threshold value may be configured as 8V；
2) bus positive sequence voltage is less than preset positive sequence voltage threshold value, and protects the maximum value of three-phase current fundamental wave virtual value
Greater than preset protection three-phase current threshold value；Protection three-phase current threshold value may be configured as 0.06In, and In is protective current mutual inductor
Secondary rated value；
1) and 2) if meeting any criterion in, secondary break occurs for bus-bar potential transformer.When busbar voltage is restored
Normally, then by certain delay think bus TV broken string eliminate, after according to S4 restore motor normal realtime power export.
Preferably, in S6, generator terminal measures the secondary break criterion of grade current transformer and generator terminal protected level current transformer
Are as follows:
1) the zero-sequence current 3I of three-phase current0> 25%Imax+ 5%In, wherein 3I0It is to be calculated according to three-phase current
Zero-sequence current value, I0It is the zero-sequence component that zero-sequence current decomposes each phase in three-phase, ImaxMost for three-phase current fundamental wave virtual value
Big value, InFor Current Transformer Secondary rated value；
2) at least a phase current is zero；
Delay is determined as that Current Transformer Secondary breaks if meeting above-mentioned two criterion simultaneously, when criterion is converted by meeting
To be unsatisfactory for, then delay thinks that Current Transformer Secondary broken string is eliminated.
Preferably, S2 calculates the electric characteristic amount using full-wave fourier algorithm, and specific algorithm is the prior art.
Preferably, in S3, output power of motor are as follows:
In formula, P is motor three phases active power, and Q is motor three phase reactive power, and N is adopting for a power frequency period
Number of samples, iA、iB、icThe motor generator terminal three-phase that grade current transformer/generator terminal protected level current transformer measures is measured for generator terminal
Electric current, uA、uB、ucFor bus three-phase voltage.
Preferably, in S4, motor unusual service condition includes: motor rotation blockage and interturn in stator windings short trouble；
If the protection three-phase current fundamental wave virtual value that S2 is calculated, measurement three-phase current direct current component value, measurement three-phase
Electric current second harmonic virtual value and measurement three-phase current triple-frequency harmonics virtual value, respectively correspond the protected level electric current base greater than setting
Wave threshold value Ih1set, measurement grade DC component threshold value Idcset, measurement grade second harmonic threshold value Ih2setIt is humorous three times with measurement grade
Wave threshold value Ih3setWhen, it is determined as that motor is in start-up course or is abnormal operating condition.The output power of motor at this time
It is switched to second protection performance number.
Preferably, protected level current first harmonics threshold value Ih1setTake 1.05-1.5 times of rated current of motor Ie, it is straight to measure grade
Flow component threshold value IdcsetTake 0.05-0.1 times of rated current of motor Ie, measure grade second harmonic threshold value Ih2setTake 0.1-
0.5 times of rated current of motor Ie measures grade triple-frequency harmonics threshold value Ih3setTake 0.1-0.3 times of rated current of motor Ie。
Invention additionally discloses a kind of high-tension motor power-measuring device, the connection lines of high-tension motor and high voltage bus
It is equipped with generator terminal protected level current transformer and generator terminal measures grade current transformer, high voltage bus is equipped with busbar voltage mutual inductance
Device；
High-tension motor power-measuring device includes:
Voltage and current sampling module, for sampling the secondary side current for obtaining generator terminal measurement grade current transformer, generator terminal is protected
Protect the secondary side current of grade current transformer and the secondary voltage data of bus-bar potential transformer；
Voltage and current characteristic quantity computing module, the voltage and current data for being obtained based on sampling, calculating busbar voltage,
The electric characteristic amount of generator terminal three-phase protective electric current and generator terminal three-phase measurement electric current；
Power computation module, the generator terminal measurement grade current transformer and generator terminal protected level electric current for being obtained based on sampling are mutual
The secondary side current of sensor and the secondary voltage of bus-bar potential transformer calculate separately to obtain motor double measurement power
With motor second protection power；
Power determines output module, the electricity based on the generator terminal three-phase protective electric current being calculated and generator terminal three-phase measurement electric current
Gas characteristic quantity, judges whether motor is in start-up course or unusual service condition:
If motor is in accidental conditions, the output power of motor is double measurement power；
If motor is in start-up course or is abnormal operating condition, the output power of motor is second protection function
Rate.
Further, high-tension motor power-measuring device further include:
Bus TV broken string determination module, for based on the electrical of the busbar voltage and generator terminal three-phase protective electric current being calculated
Characteristic quantity, judges whether bus-bar potential transformer occurs secondary break, if bus TV broken string occurs, power determines output module
Output power value before the output power of motor to be determined as to bus-bar potential transformer secondary break disappears until broken string is abnormal
It loses, then reverts to double measurement power or second protection performance number again.
Further, high-tension motor power-measuring device further include:
Current transformer circuit supervision fail determination module is based respectively on and generator terminal three-phase measurement electric current and generator terminal three-phase protective is calculated
It is secondary disconnected to judge whether generator terminal measurement grade current transformer and generator terminal protected level current transformer occur for the electric characteristic amount of electric current
Line:
If generator terminal measures grade Current Transformer Secondary broken string, generator terminal protected level current transformer is normal, then power determines defeated
The output power of motor is determined as second protection power by module out；
If secondary break also occurs for generator terminal protected level current transformer after generator terminal measures grade Current Transformer Secondary broken string,
Then it is defeated before generator terminal protected level Current Transformer Secondary breaks to determine that the output power of motor is determined as by output module for power
Performance number out.It can be double measurement power or second protection performance number according to output power is restored after the abnormal disappearance that breaks.
In the present invention, the secondary break of bus-bar potential transformer and generator terminal current transformer judges, using existing skill
Art is realized.
Beneficial effect
High-tension motor power determining method proposed by the present invention and measuring device, solve conventional motors integrated protection
Measure and control device calculates calculating deviation of the power under TA saturation state using measurement grade Current Transformer Secondary side electric current merely and asks
The sampling error of transient state when inscribing, be not only able to satisfy the power accuracy for operating normally stable state, but also can guarantee failure or disturbance.
Detailed description of the invention
Fig. 1 show the schematic diagram of application structure of high-tension motor power-measuring device of the present invention；
Fig. 2 show a kind of specific embodiment flow diagram of high-tension motor power determining method of the present invention；
Fig. 3 show another specific embodiment flow diagram of high-tension motor power determining method of the present invention；
In Fig. 1, M is motor, and TA_P is protected level current transformer, and TA_M is measurement grade current transformer, and TV is mother
Line voltage mutual inductor, UA, UB, UC are bus three-phase voltage, and Ipa, Ipb and Ipc are motor generator terminal protected level TA three-phase current,
Ima, Imb and Imc are that motor generator terminal measures grade TA three-phase current.
Specific embodiment
It is further described below in conjunction with the drawings and specific embodiments.
Refering to what is shown in Fig. 1, high-tension motor power determining method and measuring device of the invention based on electrical connection knot
Structure basis are as follows: the connection line of high-tension motor and high voltage bus is equipped with generator terminal protected level current transformer and generator terminal measures
Grade current transformer, high voltage bus are equipped with bus-bar potential transformer.
Embodiment 1
Refering to what is shown in Fig. 2, the high-tension motor power determining method of the present embodiment, comprising:
S1, secondary side current Ima, Imb and Imc, the generator terminal protected level electric current for obtaining generator terminal measurement grade current transformer are mutual
Secondary side current Ipa, Ipb and Ipc of sensor and secondary voltage UA, UB, UC data of bus-bar potential transformer；
S2 calculates busbar voltage, generator terminal three-phase protective electric current and machine using full-wave fourier algorithm based on the data that S1 is obtained
Hold the electric characteristic amount of three-phase measurement electric current；
Specifically, the electric characteristic amount of busbar voltage includes bus positive sequence voltage and bus negative sequence voltage, generator terminal three-phase is protected
The electric characteristic amount for protecting electric current includes protection three-phase current fundamental wave virtual value, protective current zero-sequence current value；The measurement of generator terminal three-phase
The electric characteristic amount of electric current includes that measurement three-phase current fundamental wave virtual value and measurement current zero sequence current value, measurement three-phase current are straight
Flow component, measurement three-phase current second harmonic virtual value and measurement three-phase current triple-frequency harmonics virtual value；
S3, the secondary side electricity based on the S1 generator terminal measurement grade current transformer and generator terminal protected level current transformer obtained
The secondary voltage of stream and bus-bar potential transformer, calculates separately to obtain motor double measurement power and the secondary guarantor of motor
Protect power；Calculation formula are as follows:
In formula, P is motor three phases active power, and Q is motor three phase reactive power, and N is adopting for a power frequency period
Number of samples, iA、iB、icThe motor generator terminal three-phase that grade current transformer/generator terminal protected level current transformer measures is measured for generator terminal
Electric current, uA、uB、ucFor bus three-phase voltage.
S4, the electric characteristic amount based on the S2 generator terminal three-phase protective electric current being calculated and generator terminal three-phase measurement electric current, sentences
Whether power-off motivation is in start-up course or unusual service condition:
If motor is in accidental conditions, the output power of motor is double measurement power；
If motor is in start-up course or is abnormal operating condition, the output power of motor is second protection function
Rate.
The motor unusual service condition includes: motor rotation blockage and interturn in stator windings short trouble.
If the protection three-phase current fundamental wave virtual value that S2 is calculated, measurement three-phase current direct current component value, measurement three-phase
Electric current second harmonic virtual value and measurement three-phase current triple-frequency harmonics virtual value, respectively correspond the protected level electric current base greater than setting
Wave threshold value Ih1set, measurement grade DC component threshold value Idcset, measurement grade second harmonic threshold value Ih2setIt is humorous three times with measurement grade
Wave threshold value Ih3setWhen, it is determined as that motor is in start-up course or is abnormal operating condition.The output power of motor at this time
It is switched to second protection performance number.
In the present embodiment, protected level current first harmonics threshold value Ih1setTake 1.05-1.5 times of rated current of motor Ie, measurement
Grade DC component threshold value IdcsetTake 0.05-0.1 times of rated current of motor Ie, measure grade second harmonic threshold value Ih2setIt takes
0.1-0.5 times of rated current of motor Ie measures grade triple-frequency harmonics threshold value Ih3setTake 0.1-0.3 times of rated current of motor Ie。
The present embodiment method further include:
S5, the electric characteristic amount based on the S2 busbar voltage being calculated and generator terminal three-phase protective electric current judge bus electricity
Whether pressure mutual inductor occurs secondary break, if then the output power of motor is defeated before bus-bar potential transformer secondary break
Performance number out, until broken string abnormal disappearance, then revert to double measurement power or second protection power according to the judgement of S4 again
Value.
The criterion of bus-bar potential transformer generation secondary break are as follows:
1) bus negative sequence voltage is greater than preset negative sequence voltage threshold value；Negative sequence voltage threshold value may be configured as 8V；
2) bus positive sequence voltage is less than preset positive sequence voltage threshold value, and protects the maximum value of three-phase current fundamental wave virtual value
Greater than preset protection three-phase current threshold value；Protection three-phase current threshold value may be configured as 0.06In, and In is protective current mutual inductor
Secondary rated value；
1) and 2) if meeting any criterion in, secondary break occurs for bus-bar potential transformer.When busbar voltage is restored
Normally, then by certain delay think bus TV broken string eliminate, after according to S4 restore motor normal realtime power export.
Embodiment 2
Refering to what is shown in Fig. 3, unlike the first embodiment, the present embodiment on the basis of embodiment 1, is judged bus electricity
Pressure mutual inductor breaks without TV after situation, further comprises the steps of:
S6 is based respectively on the electric characteristic amount that generator terminal three-phase measurement electric current and generator terminal three-phase protective electric current is calculated in S2,
Judge whether generator terminal measurement grade current transformer and generator terminal protected level current transformer occur secondary break:
If generator terminal measures grade Current Transformer Secondary broken string, generator terminal protected level current transformer is normal, then motor is defeated
Power is second protection power out；
If secondary break also occurs for generator terminal protected level current transformer after generator terminal measures grade Current Transformer Secondary broken string,
Then the output power of motor is the output power value before generator terminal protected level Current Transformer Secondary broken string.Abnormal disappearance to be broken
Afterwards, can restore output power according to S4 is double measurement power or second protection performance number.
The secondary break criterion of generator terminal measurement grade current transformer and generator terminal protected level current transformer are as follows:
1) the zero-sequence current 3I of three-phase current0> 25%Imax+ 5%In, wherein 3I0It is to be calculated according to three-phase current
Zero-sequence current value, I0It is the zero-sequence component that zero-sequence current decomposes each phase in three-phase, ImaxMost for three-phase current fundamental wave virtual value
Big value, InFor Current Transformer Secondary rated value；
2) at least a phase current is zero；
Delay is determined as that Current Transformer Secondary breaks if meeting above-mentioned two criterion simultaneously, when criterion is converted by meeting
To be unsatisfactory for, then delay thinks that Current Transformer Secondary broken string is eliminated.
Embodiment 3
Invention additionally discloses a kind of high-tension motor power-measuring device, the connection lines of high-tension motor and high voltage bus
It is equipped with generator terminal protected level current transformer and generator terminal measures grade current transformer, high voltage bus is equipped with busbar voltage mutual inductance
Device；
High-tension motor power-measuring device includes:
Voltage and current sampling module, for sampling the secondary side current for obtaining generator terminal measurement grade current transformer, generator terminal is protected
Protect the secondary side current of grade current transformer and the secondary voltage data of bus-bar potential transformer；
Voltage and current characteristic quantity computing module, the voltage and current data for being obtained based on sampling, calculating busbar voltage,
The electric characteristic amount of generator terminal three-phase protective electric current and generator terminal three-phase measurement electric current；
Power computation module, the generator terminal measurement grade current transformer and generator terminal protected level electric current for being obtained based on sampling are mutual
The secondary side current of sensor and the secondary voltage of bus-bar potential transformer, calculate separately to obtain motor double measurement power and
Motor second protection power；
Power determines output module, the electricity based on the generator terminal three-phase protective electric current being calculated and generator terminal three-phase measurement electric current
Gas characteristic quantity, judges whether motor is in start-up course or unusual service condition:
If motor is in accidental conditions, the output power of motor is double measurement power；
If motor is in start-up course or is abnormal operating condition, the output power of motor is second protection function
Rate.
Further, high-tension motor power-measuring device further include:
Bus TV broken string determination module, for based on the electrical of the busbar voltage and generator terminal three-phase protective electric current being calculated
Characteristic quantity, judges whether bus-bar potential transformer occurs secondary break, if bus TV broken string occurs, power determines output module
Output power value before the output power of motor to be determined as to bus-bar potential transformer secondary break disappears until broken string is abnormal
It loses, then reverts to double measurement power or second protection performance number again.
Further, high-tension motor power-measuring device further include:
Current transformer circuit supervision fail determination module is based respectively on and generator terminal three-phase measurement electric current and generator terminal three-phase protective is calculated
It is secondary disconnected to judge whether generator terminal measurement grade current transformer and generator terminal protected level current transformer occur for the electric characteristic amount of electric current
Line:
If generator terminal measures grade Current Transformer Secondary broken string, generator terminal protected level current transformer is normal, then power determines defeated
The output power of motor is determined as second protection power by module out；
If secondary break also occurs for generator terminal protected level current transformer after generator terminal measures grade Current Transformer Secondary broken string,
Then it is defeated before generator terminal protected level Current Transformer Secondary breaks to determine that the output power of motor is determined as by output module for power
Performance number out.It can be double measurement power or second protection performance number according to output power is restored after the abnormal disappearance that breaks.
In the present invention, the judgment method of the secondary break of bus-bar potential transformer and generator terminal current transformer be can refer to
Corresponding criterion in embodiment 1, or realized using other prior arts.
When secondary break occurs for bus-bar potential transformer, double measurement power and second protection performance number that device calculates
It will become smaller or become zero, the motor power (output) measuring device software of the present embodiment can be automatically identified according to TV broken string criterion
Voltage transformer disconnection is abnormal, and provides power and keep function, and real output is the normal value before voltage transformer disconnection,
Until broken string abnormal disappearance restores measured value；
When secondary break occurs for generator terminal measurement grade current transformer, actual power takes second protection power, generator terminal measurement
After secondary break occurs generator terminal protected level Current Transformer Secondary broken string occurs again for grade current transformer, and software uses and bus electricity
Consistent strategy when mutual inductor secondary break is pressed to provide power holding function, real output is before current transformer circuit supervision fail
Normal value, until broken string abnormal disappearance restores measured value.
Embodiment 4
The present embodiment is a kind of motor multi-protection test and control device, is determined using motor power (output) described in embodiment 1
Method carries out the determination of output power of motor, or including motor power (output) measuring device as described in example 2, to realize electricity
The measurement of motivation power, then provides data basis for motor protection, so that power determines accurately, protects the reliability of output
It is improved.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
The embodiment of the present invention is described in conjunction with attached drawing above, but the invention is not limited to above-mentioned specific
Embodiment, the above mentioned embodiment is only schematical, rather than restrictive, those skilled in the art
Under the inspiration of the present invention, without breaking away from the scope protected by the purposes and claims of the present invention, it can also make very much
Form, all of these belong to the protection of the present invention.
Claims (12)
1. the connection line of a kind of high-tension motor power determining method, high-tension motor and high voltage bus is protected equipped with generator terminal
Grade current transformer and generator terminal measure grade current transformer, and high voltage bus is equipped with bus-bar potential transformer；It is characterized in that:
Method includes:
S1 obtains the secondary side current of generator terminal measurement grade current transformer, the secondary side current of generator terminal protected level current transformer,
And the secondary voltage data of bus-bar potential transformer；
S2 calculates the electrical of busbar voltage, generator terminal three-phase protective electric current and generator terminal three-phase measurement electric current based on the data that S1 is obtained
Characteristic quantity；
S3, based on S1 obtain generator terminal measurement grade current transformer and generator terminal protected level current transformer secondary side current and
The secondary voltage of bus-bar potential transformer calculates separately to obtain motor double measurement power and motor second protection power；
S4, the electric characteristic amount based on the S2 generator terminal three-phase protective electric current being calculated and generator terminal three-phase measurement electric current, judges electricity
Whether motivation is in start-up course or unusual service condition:
If motor is in accidental conditions, the output power of motor is double measurement power；
If motor is in start-up course or is abnormal operating condition, the output power of motor is second protection power.
2. according to the method described in claim 1, it is characterized in that: further include:
S5, the electric characteristic amount based on the S2 busbar voltage being calculated and generator terminal three-phase protective electric current, judges that busbar voltage is mutual
Whether sensor occurs secondary break, if then the output power of motor is the output work before bus-bar potential transformer secondary break
Rate value, until broken string abnormal disappearance, then revert to double measurement power or second protection performance number according to the judgement of S4 again.
3. according to the method described in claim 1, it is characterized in that: further include:
S6 is based respectively on the electric characteristic amount that generator terminal three-phase measurement electric current and generator terminal three-phase protective electric current is calculated in S2, judgement
Whether generator terminal measurement grade current transformer and generator terminal protected level current transformer occur secondary break:
If generator terminal measures grade Current Transformer Secondary broken string, generator terminal protected level current transformer is normal, then the output work of motor
Rate is second protection power；
If secondary break also occurs for generator terminal protected level current transformer after generator terminal measures grade Current Transformer Secondary broken string, then electric
The output power of motivation is the output power value before generator terminal protected level Current Transformer Secondary broken string.
4. method according to any one of claims 1 to 3, it is characterized in that: the electric characteristic amount of busbar voltage includes bus
Positive sequence voltage and bus negative sequence voltage, the electric characteristic amount that generator terminal three-phase measures electric current includes that measurement three-phase current fundamental wave is effective
Value, measurement current zero sequence current value, measurement three-phase current DC component, measurement three-phase current second harmonic virtual value and measurement three
Phase current triple-frequency harmonics virtual value；The electric characteristic amount of generator terminal three-phase protective electric current include protection three-phase current fundamental wave virtual value and
Protective current zero-sequence current value.
5. according to the method described in claim 4, it is characterized in that: the criterion of secondary break occurs for bus-bar potential transformer in S5
Are as follows:
1) bus negative sequence voltage is greater than preset negative sequence voltage threshold value；
2) bus positive sequence voltage is less than preset positive sequence voltage threshold value, and the maximum value of three-phase current fundamental wave virtual value is protected to be greater than
Preset protection three-phase current threshold value；
1) and 2) if meeting any criterion in, secondary break occurs for bus-bar potential transformer.
6. according to the method described in claim 4, it is characterized in that: generator terminal measures grade current transformer and generator terminal protected level in S6
The secondary break criterion of current transformer are as follows:
1) the zero-sequence current 3I of three-phase current0> 25%Imax+ 5%In, wherein 3I0It is the zero sequence being calculated according to three-phase current
Current value, ImaxFor the maximum value of three-phase current fundamental wave virtual value, InFor Current Transformer Secondary rated value；
2) at least a phase current is zero；
Delay is determined as that Current Transformer Secondary breaks if meeting above-mentioned two criterion simultaneously, when criterion is converted to not by meeting
Meet, then delay thinks that Current Transformer Secondary broken string is eliminated.
7. according to the method described in claim 4, it is characterized in that: in S3, output power of motor are as follows:
In formula, P is motor three phases active power, and Q is motor three phase reactive power, and N is the sampled point of a power frequency period
Number, iA、iB、icThe motor generator terminal three-phase electricity that grade current transformer/generator terminal protected level current transformer measures is measured for generator terminal
Stream, uA、uB、ucFor bus three-phase voltage.
8. according to the method described in claim 1, it is characterized in that: motor unusual service condition includes: motor rotation blockage and stator in S4
Shorted-turn fault；
If the protection three-phase current fundamental wave virtual value that S2 is calculated, measurement three-phase current direct current component value, measurement three-phase current
Second harmonic virtual value and measurement three-phase current triple-frequency harmonics virtual value, respectively correspond the protected level current first harmonics door greater than setting
Threshold value Ih1set, measurement grade DC component threshold value Idcset, measurement grade second harmonic threshold value Ih2setWith measurement grade triple-frequency harmonics door
Threshold value Ih3setWhen, it is determined as that motor is in start-up course or is abnormal operating condition.
9. according to the method described in claim 8, it is characterized in that: protected level current first harmonics threshold value Ih1setTake 1.05-1.5 times
Rated current of motor Ie, measure grade DC component threshold value IdcsetTake 0.05-0.1 times of rated current of motor Ie, measure grade two
Subharmonic threshold value Ih2set0.1-0.5 times of rated current of motor Ie is taken, grade triple-frequency harmonics threshold value I is measuredh3setTake 0.1-
0.3 times of rated current of motor Ie。
10. the connection line of a kind of high-tension motor power-measuring device, high-tension motor and high voltage bus is protected equipped with generator terminal
It protects grade current transformer and generator terminal measures grade current transformer, high voltage bus is equipped with bus-bar potential transformer；It is characterized in that:
High-tension motor power-measuring device includes:
Voltage and current sampling module, for sampling the secondary side current, the generator terminal protected level that obtain generator terminal measurement grade current transformer
The secondary side current of current transformer and the secondary voltage data of bus-bar potential transformer；
Voltage and current characteristic quantity computing module, the voltage and current data for being obtained based on sampling, calculates busbar voltage, generator terminal
The electric characteristic amount of three-phase protective electric current and generator terminal three-phase measurement electric current；
Power computation module, generator terminal measurement grade current transformer and generator terminal protected level current transformer for being obtained based on sampling
Secondary side current and bus-bar potential transformer secondary voltage, calculate separately to obtain motor double measurement power and electricity
Motivation second protection power；
Power determines output module, based on the electric characteristic amount for the generator terminal three-phase protective electric current being calculated, judges that motor is
It is no to be in start-up course or unusual service condition:
If motor is in accidental conditions, the output power of motor is double measurement power；
If motor is in start-up course or is abnormal operating condition, the output power of motor is second protection power.
11. high-tension motor power-measuring device according to claim 10, characterized in that further include:
Bus TV broken string determination module, for the electric characteristic based on the busbar voltage and generator terminal three-phase protective electric current that are calculated
Amount, judges whether bus-bar potential transformer occurs secondary break, if bus TV broken string occurs, power determines that output module will be electric
The output power of motivation is determined as the output power value before bus-bar potential transformer secondary break, until broken string abnormal disappearance, then
Again double measurement power or second protection performance number are reverted to.
12. high-tension motor power-measuring device according to claim 10, characterized in that further include:
Current transformer circuit supervision fail determination module is based respectively on and generator terminal three-phase measurement electric current and generator terminal three-phase protective electric current is calculated
Electric characteristic amount, judge generator terminal measurement grade current transformer and generator terminal protected level current transformer whether secondary break occurs:
If generator terminal measures grade Current Transformer Secondary broken string, generator terminal protected level current transformer is normal, then power determines output mould
The output power of motor is determined as second protection power by block；
If secondary break also occurs for generator terminal protected level current transformer, then function after generator terminal measures grade Current Transformer Secondary broken string
Rate determines the output work that the output power of motor is determined as before generator terminal protected level Current Transformer Secondary broken string by output module
Rate value.
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