CN105137347A - Instrument calibration system with specified power output function and instrument calibration method - Google Patents

Abstract

The invention relates to the technical field of instrument calibration, in particular to an instrument calibration system and an instrument calibration method with a specified power output function. The instrument calibrating system includes a power calculation module and a protection calibrator. The power computing module includes an input memory, a central processing unit and an output memory sequentially connected through a bus. The threshold power value is directly input into the input memory, and the central processing unit reads the After taking the threshold power value, the voltage, current and angle corresponding to the threshold power value can be calculated, and the voltage, current and angle are input to the input port of the protection calibrator through the output memory, and the protection calibrator passes the corresponding Input the voltage, current and angle of the excitation device into the excitation device, and then it is convenient to verify whether the low excitation function of the excitation device is complete. The entire verification process directly inputs the specified power value into the input memory, and the excitation can be verified by the protection calibrator. The low excitation function of the device, the verification time is short and the accuracy is high.

Description

Instrument calibration system and instrument calibration method with specified power output function

technical field

The invention relates to the technical field of instrument calibration, in particular to an instrument calibration system and an instrument calibration method with a specified power output function.

Background technique

At present, the protection calibrator can output the standard voltage and current for the calibration of various instruments. Generally, according to the given power, input the corresponding voltage, current and angle into the protection calibrator instead of directly Input and output specified power. The low-excitation limiting function of the generator excitation device needs to be verified during static commissioning. The verification method is to pass the low-excitation threshold value to the excitation device through the protection calibrator, which is the value of active power and reactive power. The protection calibrator can only output a given voltage and current, which requires manual adjustment of the voltage, current and angle to reach a given power value. However, due to the long time and low accuracy of artificial adjustment, it may lead to time-consuming and inaccurate verification of low excitation functions.

Therefore, aiming at the above deficiencies, the present invention provides an instrument calibration system and an instrument calibration method with a specified power output function.

Contents of the invention

(1) Technical problems to be solved

The object of the present invention is to provide an instrument calibration system and an instrument calibration method with a specified power output function to solve the problems of time-consuming verification and inaccuracy in the verification of the existing low-excitation limiting function of the excitation device.

(2) Technical solutions

In order to solve the above-mentioned technical problems, the present invention provides an instrument calibrating system with a specified power output function, which includes a power computing module and a protection calibrator, and the power computing module includes an input memory, a central processing The input memory is used to input the specified power value. The central processing unit is used to calculate the corresponding voltage, current and angle according to the specified power value. The output memory is used to output the voltage, current and angle. The output memory and The input port of the protection calibrator is connected, and the output port of the protection calibrator is connected with the excitation device through a test line.

Wherein, the input memory includes a connected active power value storage unit and a reactive power value storage unit.

Wherein, the central processing unit calculates the corresponding voltage, current and angle through a power calculation model, and the power calculation model is:

In the formula, U is the voltage, I is the current, is the angle, P is the active power, and Q is the reactive power.

Wherein, the output memory is connected to the input port of the protection calibrator through a data line.

A kind of instrument verification method, it comprises the following steps:

S1. Input the threshold power value for testing the low excitation function of the excitation device into the input memory in the power calculation module;

S2. Calculate the corresponding voltage, current and angle through the central processing unit;

S3. Input the voltage, current and angle calculated in step S2 to the input port of the protection calibrator through the output memory;

S4. Output the corresponding voltage, current and angle to the excitation device through the output port of the protection calibrator to verify whether the low excitation function of the excitation device is complete.

Wherein, in step S2, the central processing unit calculates the corresponding voltage, current and angle according to the power calculation model.

(3) Beneficial effects

The technical solution of the present invention has the following advantages: in the instrument calibration system and the instrument calibration method provided by the present invention with a specified power output function, the threshold power value of the low excitation function of the test excitation device is directly input in the input memory, and the central processing After the controller reads the threshold power value, it can calculate the voltage, current and angle corresponding to the threshold power value. After the central processing unit calculates the voltage, current and angle, the voltage, current and angle are input to the output memory through the output memory. The input port of the protection calibrator, the protection calibrator can easily verify whether the low excitation function of the excitation device is complete by inputting the corresponding voltage, current and angle into the excitation device, and the entire calibration process does not need to be carried out manually For the adjustment of voltage, current and angle, directly input the specified power value to the input memory, and then the low excitation function of the excitation device can be verified by the protection calibrator. The verification time is short and the accuracy is high, avoiding the low excitation caused by artificial adjustment. Functional verification takes a lot of time and the verification is not accurate.

Description of drawings

Fig. 1 is a diagram of the connection relationship between components of an instrument calibration system with a specified power output function according to an embodiment of the present invention.

In the figure, 1: power calculation module; 2: data line; 3: protection calibrator; 4: test line; 5: excitation device; 101: input memory; 102: central processing unit; 103: output memory; 104: data bus.

Detailed ways

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

Example 1

As shown in Figure 1, the instrument calibrating system with specified power output function provided by the present invention comprises a power computing module 1 and a protection calibrator 3, and the power computing module 1 includes an input memory 101 connected, a central processing unit 102 and an output Memory 103, the input memory 101 is connected to the central processing unit 102 through the data bus 104, the central processing unit 102 is connected to the output memory 103 through the data bus 104, and the output memory 103 is connected to the input port in the protection calibrator 3 through the data line 2, The output port of the protection calibrator 3 is connected to the input port of the excitation device 5 through the test line 4 . The input memory 101 is used for the input of the specified power value, the central processing unit 102 is used for calculating the corresponding voltage, current and angle according to the specified power value, and the output memory 103 is used for the output of the voltage, current and angle.

In the above-mentioned technical scheme, directly input the threshold power value of the low excitation function of the test excitation device 5 in the input memory 101, which includes active power value and reactive power value. After the central processing unit 102 reads the threshold power value, it can calculate The voltage, current and angle corresponding to the threshold power value, the voltage, current and angle calculated by the central processing unit 102 are input to the input port of the protection calibrator 3 through the output memory 103, and the protection calibrator 3 passes the corresponding The voltage, current and angle are input into the excitation device 5, and then it is convenient to check whether the low excitation function of the excitation device 5 is complete. In this way, after the specified power value is given, there is no need to manually adjust the voltage, current and angle, and the specified power value is directly input into the input memory 101, and the low excitation function of the excitation device 5 can be checked by the protection calibrator 3 Whether it is complete, the verification time is short and the accuracy is high.

Further, the input memory 101 includes a connected active power value storage unit and a reactive power value storage unit, which are respectively used for input and storage of active power values and reactive power values; the central processing unit 102 calculates the corresponding The voltage, current and angle quantities of the described power operation model are:

In the formula, U is the voltage, I is the current, is the angle, P is the active power, and Q is the reactive power.

Example 2

Corresponding to Embodiment 1, another aspect of the present invention provides an instrument verification method, which includes the following steps:

S1. Input the threshold power value of the low excitation function of the test excitation device 5 into the input memory 101 in the power computing module 1;

S2. Calculate the corresponding voltage, current and angle through the central processing unit 102;

S3. Input the voltage, current and angle calculated in step S2 to the input port of the protection calibrator 3 through the output memory 103;

S4. Output the corresponding voltage, current and angle to the excitation device 5 through the output port of the protection calibrator 3 to verify whether the low excitation function of the excitation device 5 is complete.

Specifically, in step S2, the central processing unit 102 calculates the corresponding voltage, current and angle according to the power calculation model.

Wherein, the power calculation module 1 , the input memory 101 , the central processing unit 102 , the output memory 103 , the protection calibrator 3 and the excitation device 5 described in this embodiment are the same as those in the first embodiment.

In summary, in the instrument calibration system and the instrument calibration method provided by the present invention with a specified power output function, the threshold power value for testing the low excitation function of the excitation device 5 is directly input in the input memory 101, and the central processing unit 102 reads After taking the threshold power value, the voltage, current and angle corresponding to the threshold power value can be calculated. The central processing unit 102 calculates the voltage, current and angle according to the power calculation model, and inputs it to the protection verification through the output memory 103. The input port of the protection calibrator 3, by inputting the corresponding voltage, current and angle into the excitation device 5, the protection calibrator 3 can conveniently verify whether the low excitation function of the excitation device 5 is complete, and the whole calibration process does not require human Adjust the voltage, current and angle, and directly input the specified power value to the input memory 101, then the low-excitation function of the excitation device 5 can be verified by the protection calibrator 3. The verification time is short and the accuracy is high, avoiding manual adjustments This brings about the problems of time-consuming and inaccurate verification of the low excitation function. In addition, multiple verifications of multiple power values can be performed through the instrument verification system of the present invention.

The above are only preferred embodiments of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the technical principles of the present invention, some improvements and modifications can also be made, and these improvements and modifications should also be It is regarded as the protection scope of the present invention.

Claims (6)

1. one kind has the instrument check system of specified power output function, it is characterized in that: it comprises Power arithmetic module and protective calibration instrument, described Power arithmetic module comprises the input store connected successively by bus, central processing unit and output storage, input store is used to specify the input of performance number, central processing unit is used for calculating corresponding voltage according to specified power value, electric current and angular metric, output storage is used for voltage, electric current and angle metric output, output storage is connected with protective calibration instrument input port, protective calibration instrument output port is connected by p-wire with excitation unit.

2. the instrument check system with specified power output function according to claim 1, is characterized in that: described input store comprises the active power value storage unit and reactive power value storage unit that are connected.

3. the instrument check system with specified power output function according to claim 2, is characterized in that: described central processing unit calculates corresponding voltage, electric current and angular metric by Power arithmetic model, and described Power arithmetic model is:

In formula, U is voltage, and I is electric current, for angular metric, P is active power, and Q is reactive power.

4. the instrument check system with specified power output function according to claim 3, is characterized in that: described output storage is connected by data line with protective calibration instrument input port.

5. an instrument method of calibration, is characterized in that: it comprises the following steps:

S1, test excitation unit low threshold performance number of encouraging function is input in the input store in Power arithmetic module;

S2, calculate corresponding voltage, electric current and angular metric by central processing unit;

S3, the voltage calculated in step S2, electric current and angular metric are input to the input port of protective calibration instrument by output storage;

S4, export corresponding voltage, electric current and angular metric to excitation unit by the output port of protective calibration instrument, whether complete with the low function of encouraging verifying excitation unit.

6. instrument method of calibration according to claim 5, it is characterized in that: in step S2, central processing unit calculates corresponding voltage, electric current and angular metric according to Power arithmetic model.