A test system and method for box-type substation loss

Abstract

The present invention relates to a test system and method for box-type substation loss. By constructing a test system for box-type substation loss including a test unit, a data unit, a display unit and a communication unit, the test system collects the loss of a high-voltage room, a low-voltage room, an auxiliary and a control circuit after a temperature rise test, and calculates the total loss of the substation to construct a detection method and a wiring diagram of a temperature rise test substation, thereby realizing accurate and reasonable measurement of the loss of the box-type substation, and serving as a data support for evaluating the energy-saving performance of the box-type substation. The present invention directly fills the technical gap of box-type substation products in the field of detection and testing, can obtain the loss results of the box-type substation, and directly make qualitative and quantitative analysis of the energy-saving performance of the box-type substation.

Description

Technical Field

[0001] The invention belongs to the technical field of box-type substation detection, and in particular to a test system and method for box-type substation loss. Background Art

[0002] Box-type substation is also called prefabricated substation or prefabricated substation. It is a kind of high-voltage switchgear, distribution transformer and low-voltage distribution device, and other functional units are organically combined and installed in a steel structure box. With the rapid development of the economy, the automation degree of large enterprises is getting higher and higher. Advanced automation equipment has the characteristics of high efficiency and long continuous operation time, and the corresponding power supply requirements are also very high. Among the terminal electricity consumption in my country's society, box-type substation is the main distribution facility. Because it is widely used in small and medium-sized urban and rural distribution networks, such as urban high-rise buildings, residential areas, municipal facilities, factories, mines, oil fields and other places, with the continuous increase in electricity demand and the construction of power grids, the installed capacity of box-type substation is also increasing, and the loss is amazing. The energy-saving issue of box-type substation has received increasing attention, but there is no reasonable and effective test system and method in the industry to measure the loss of box-type substation. Without measurement, there is no effective judgment scheme to evaluate the energy-saving performance of box-type substation. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and to propose a test system and method for box-type substation losses, which can accurately and reasonably measure the losses of box-type substations and directly make qualitative and quantitative analysis of the energy-saving performance of box-type substations.

[0004] The present invention solves the technical problem by adopting the following technical solutions:

[0005] A test system for box-type substation loss includes a test unit, a data unit, a display unit and a communication unit. The test unit, the communication unit, the data unit and the display unit are connected in sequence, wherein the communication unit and the data unit are bidirectionally connected. The test unit includes a test scheme unit and a test equipment unit. The data unit includes a test data acquisition unit and a test data analysis unit. The display unit includes a real-time data display unit and a result data display unit. The test equipment unit is connected to the test data acquisition unit and the test data analysis unit via the communication unit. The test data acquisition unit and the test data analysis unit are connected to the real-time data display unit and the result data display unit.

[0006] Furthermore, the test equipment unit comprises: a temperature inspection instrument, a power analyzer, a program-controlled AC constant current power supply, a voltage regulator and a harmonic source.

[0007] A test method for a box-type substation loss test system comprises the following steps:

[0008] Step 1: Determine the no-load loss, load loss and short-circuit impedance of the transformer;

[0009] Step 2: Conduct temperature rise test in high voltage room, transformer room and low voltage room simultaneously;

[0010] Step 3: After the temperature rise test is completed, the loss measurement of the high-voltage switchgear and the high-voltage connecting wire and the loss measurement of the low-voltage switchgear and the low-voltage connecting wire are immediately carried out;

[0011] Step 4: Determine the losses of all auxiliary and control circuits;

[0012] Step 5: Calculate all measured data.

[0013] Moreover, the specific implementation method of step 1 is: by opening the high-voltage side and providing the rated voltage to the low-voltage side, the no-load loss is measured using a power analyzer; by short-circuiting the low-voltage side and passing the rated current on the high-voltage side, the load loss is measured using a power analyzer, and the measured data is uploaded through the communication unit.

[0014] Moreover, the specific implementation method of step 2 is: connect the transformer to the high-voltage switchgear in the high-voltage room, connect the power supply to the incoming terminal of the high-voltage switchgear, and the high-voltage switchgear should pass the rated current value of the high-voltage side of the tested transformer for temperature rise test; at the same time, disconnect the low-voltage side of the transformer, short-circuit the low-voltage side terminals of the transformer, short-circuit the low-voltage connecting line, and the low-voltage distribution circuit in the low-voltage room should pass the rated current of the low-voltage side of the tested transformer; the test current is applied to the low-voltage switchgear through the outlet terminal of the low-voltage switchgear, and the current is distributed with a dispersion coefficient of 0.8, and the rated voltage of the compensation circuit in the low-voltage room is tested.

[0015] Moreover, the temperature rise test requires that the heating of each functional room be carried out under the most unfavorable conditions, and the temperature rise of the transformer, high-voltage switchgear and high-voltage connecting wires, and low-voltage equipment and low-voltage connecting wires be carried out simultaneously; the loss test of the box transformer fan needs to be tested once when the fan is turned on and once when the fan is turned off; the temperature rise test must reach a stable state and the test must be carried out for at least 6 hours.

[0016] Moreover, the specific implementation method of the loss measurement of the high-voltage switchgear and the high-voltage connecting wires in step 3 is: after the temperature rise test in step 2 is completed, the loss of the high-voltage switchgear and the high-voltage connecting wires is measured using a power analyzer, and the results are uploaded through the communication unit.

[0017] Moreover, the specific implementation method of the loss measurement of the low-voltage switchgear and the low-voltage connecting wires in step 3 is: after the temperature rise test in step 2 is completed, a power analyzer is used to measure the loss of the low-voltage switchgear and the low-voltage connecting wires, and the results are uploaded through the communication unit.

[0018] Moreover, the specific implementation method of step 4 is: after step 3 is completed, the power analyzer is used to measure the losses of all auxiliary and control circuits together, and the results are uploaded through the communication unit.

[0019] Moreover, the specific implementation method of step 5 is: the communication unit calculates the collected no-load and load loss data of the transformer to obtain the total loss value of the transformer at 75°C, and comprehensively calculates the total loss value of the box-type substation based on the collected loss data of the high-voltage chamber, low-voltage chamber, auxiliary and control circuits, and calculates the loss ratio based on the total capacity of the box-type substation.

[0020] The advantages and positive effects of the present invention are:

[0021] The present invention constructs a test system for the loss of a box-type substation including a test unit, a data unit, a display unit and a communication unit. After the temperature rise test, the losses of the high-voltage room, the low-voltage room, the auxiliary and control circuits are collected, and the total loss of the substation is calculated to construct the detection method and the wiring diagram of the temperature rise test substation, so as to achieve accurate and reasonable measurement of the loss of the box-type substation, and to serve as a data support for the evaluation of the energy-saving performance of the box-type substation. The present invention directly fills the technical gap of the box-type substation product in the field of detection and testing, can obtain the loss results of the box-type substation, and directly make qualitative and quantitative analysis of the energy-saving performance of the box-type substation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a structural diagram of the system of the present invention;

[0023] Figure 2 is a flow chart of the method of the present invention;

[0024] Figure 3 It is the wiring diagram of the temperature rise test of the present invention;

[0025] Figure 4 This is a schematic diagram of the data unit transmission principle of the present invention. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below with reference to the accompanying drawings.

[0027] A test system for box-type substation loss, such as Figure 1As shown, it includes a test unit, a data unit, a display unit and a communication unit, and the test unit, the communication unit, the data unit and the display unit are connected in sequence, wherein the communication unit and the data unit are bidirectionally connected. The test unit includes a test plan unit and a test equipment unit, and the test equipment unit can be connected to the display unit through the communication unit. The data unit includes a test data acquisition unit and a test data analysis unit. The communication unit obtains the test data delivered by the test equipment and then transmits it to the data unit for storage, display and data processing. The display unit includes a real-time data display unit and a result data display unit. The display unit obtains data with the help of the communication unit, displays the test data in real time, and the test results are finally displayed in the form of a data table.

[0028] The test equipment unit includes: temperature patrol meter, power analyzer, programmable AC constant current power supply, voltage regulator and harmonic source. The temperature patrol meter measures the temperature rise data, and then uploads the temperature rise data in real time. The display unit will issue a notification after the temperature rise stabilizes. The power analyzer measures the loss value of the high-voltage room and high-voltage connecting wire, the loss value of the low-voltage room and low-voltage connecting wire, and the loss value of the auxiliary and control circuits, and uploads the data in real time. The programmable AC constant current power supply, voltage regulator and harmonic source are all power supply equipment, which provide current or voltage values ​​for the temperature rise test. The current or voltage values ​​are required to be monitored in real time, and the current or voltage set values ​​are adjusted in real time to ensure that the current or voltage values ​​always meet the requirements during the temperature rise period.

[0029] The test unit relies on the communication unit to transmit the test data generated during the test to the display unit for data monitoring in real time. For example, the output current value of the programmable AC constant current power supply and voltage regulator, and the voltage value given by the harmonic source can be monitored in real time to ensure that the temperature rise current or voltage value is always within the error range. The temperature rise data measured by the temperature patrol meter can also be used to determine the time point when the temperature rise test reaches stability.

[0030] like Figure 4 As shown, the data acquisition unit collects the temperature rise data uploaded by the temperature inspection instrument, the no-load loss and load loss of the transformer measured by the power analyzer, the loss values ​​of the high-voltage room and the low-voltage room, and the loss values ​​of the auxiliary and control circuits. The output current / voltage values ​​of the program-controlled AC constant current power supply, voltage regulator and harmonic source are collected.

[0031] The data analysis unit calculates the total loss value of the transformer at 75°C based on the no-load and load loss data of the transformer obtained by the data acquisition unit. Then, based on a series of loss data of the high-voltage room, low-voltage room, auxiliary and control circuits collected by the data acquisition unit, the total loss value of the box-type substation is comprehensively calculated, and the loss ratio is calculated based on the total capacity of the box-type substation.

[0032] The communication unit uses wireless network and local area network as the medium to upload and download data. The test equipment units are equipped with wireless network cards or standard communication interfaces to communicate with the host computer in real time. The communication unit not only ensures the data interaction between the test unit and the data unit, but also ensures the data interaction between the data unit and the display unit.

[0033] As the test system terminal, the display unit has the basic functions of uploading, downloading and displaying chart data. It can display the distributed test data of the test unit in real time and monitor the test process. It adopts centralized data processing method and finally displays the test results.

[0034] A test method for a test system of box-type substation loss, such as Figure 2 As shown, the following steps are included:

[0035] Step 1: Measure the no-load loss, load loss and short-circuit impedance of the transformer. Open the high-voltage side and apply rated voltage to the low-voltage side, and use a power analyzer to measure the no-load loss; short-circuit the low-voltage side and apply rated current to the high-voltage side, and use a power analyzer to measure the load loss, and upload the measured data through the communication unit.

[0036] Step 2: Conduct temperature rise tests in the high voltage room, transformer room and low voltage room simultaneously.

[0037] like Figure 3 As shown, the wiring scheme of this step is: the high-voltage winding of the transformer is connected to the high-voltage switchgear, and the high-voltage room and the high-voltage connecting line are passed through the rated current of the high-voltage side of the transformer for temperature rise test. The low-voltage winding of the transformer is disconnected from the low-voltage room, and the low-voltage winding and low-voltage connecting line of the transformer are short-circuited. The low-voltage distribution circuit adopts the low-voltage and high-current method for temperature rise test, that is, the low-voltage distribution circuit distributes the current value according to the dispersion coefficient 0.8 and the number of branches, the main circuit current value is the rated current value of the low-voltage side of the transformer, and the low-voltage compensation circuit directly gives the rated voltage of the circuit for testing. The high-voltage room, transformer room, and low-voltage room should be tested at the same time. The selection of current or voltage should take into account the flow of the box transformer during normal operation to simulate the heating situation during normal operation. The temperature rise test should be carried out for at least 6 hours. The temperature rise value change of each temperature rise measurement point does not exceed 1K within 1 hour. It is considered that the temperature rise has reached a stable state and the temperature rise test is over.

[0038] The high voltage room, transformer room and low voltage room should be tested for temperature rise at the same time to ensure that the heating of each functional room is in the most unfavorable condition. The loss test of the box transformer needs to be tested once with the fan turned on and once with the fan turned off.

[0039] Step 3. After the temperature rise test is completed, the loss of high-voltage switchgear and high-voltage connecting wires shall be measured immediately. After the temperature rise test in step 2 is completed, the loss of high-voltage switchgear and high-voltage connecting wires shall be measured by a power analyzer, and the results shall be uploaded through the communication unit. After the temperature rise test is completed, the loss of low-voltage switchgear and low-voltage connecting wires shall be measured immediately. After the temperature rise test in step 2 is completed, the loss of low-voltage switchgear and low-voltage connecting wires shall be measured by a power analyzer, and the results shall be uploaded through the communication unit.

[0040] Step 4: Measure the losses of all auxiliary and control circuits. After step 3, use a power analyzer to measure the losses of all auxiliary and control circuits, and upload the results through the communication unit.

[0041] Step 5: Calculate all measured data. The communication unit calculates the collected no-load and load loss data of the transformer to obtain the total loss value of the transformer at 75°C. Based on the collected loss data of the high-voltage room, low-voltage room, auxiliary and control circuits, the total loss value of the box-type substation is comprehensively calculated, and the loss ratio is calculated based on the total capacity of the box-type substation.

[0042] It should be emphasized that the embodiments described in the present invention are illustrative rather than restrictive. Therefore, the present invention includes but is not limited to the embodiments described in the specific implementation manner. Any other implementation manners derived by those skilled in the art based on the technical solution of the present invention also fall within the scope of protection of the present invention.

Claims

1. A test method for a box-type substation loss test system, characterized in that: The system used includes a test unit, a data unit, a display unit and a communication unit, wherein the test unit, the communication unit, the data unit and the display unit are connected in sequence, wherein the communication unit and the data unit are bidirectionally connected, the test unit includes a test plan unit and a test equipment unit, the data unit includes a test data acquisition unit and a test data analysis unit, the display unit includes a real-time data display unit and a result data display unit, the test equipment unit is connected to the test data acquisition unit and the test data analysis unit through the communication unit, and the test data acquisition unit and the test data analysis unit are connected to the real-time data display unit and the result data display unit; the test equipment unit includes: a temperature inspection meter, a power analyzer, a programmable AC constant current power supply, a voltage regulator and a harmonic source; The test method comprises the following steps: Step 1: Determine the no-load loss, load loss and short-circuit impedance of the transformer; The specific implementation method of step 1 is: by opening the high-voltage side and applying rated voltage to the low-voltage side, the no-load loss is measured using a power analyzer; by short-circuiting the low-voltage side and applying rated current to the high-voltage side, the load loss is measured using a power analyzer, and the measured data is uploaded through the communication unit; Step 2: Conduct temperature rise test in high voltage room, transformer room and low voltage room simultaneously; The specific implementation method of step 2 is: connect the transformer to the high-voltage switchgear in the high-voltage room, connect the power supply to the incoming terminal of the high-voltage switchgear, and the high-voltage switchgear shall pass the rated current value of the high-voltage side of the tested transformer for temperature rise test; at the same time, disconnect the low-voltage side of the transformer, short-circuit the low-voltage side terminals of the transformer, short-circuit the low-voltage connecting line, and pass the rated current of the low-voltage side of the tested transformer in the low-voltage distribution circuit in the low-voltage room; the test current is applied to the low-voltage switchgear through the outlet terminal of the low-voltage switchgear, and the current is distributed with a dispersion coefficient of 0.8, and the rated voltage of the compensation circuit in the low-voltage room is tested; The temperature rise test needs to be carried out under the most unfavorable conditions for the heating of each functional room. The temperature rise of the transformer, high-voltage switchgear and high-voltage connecting wires, low-voltage equipment and low-voltage connecting wires are carried out simultaneously. The loss test of the box transformer fan needs to be tested once when the fan is turned on and once when the fan is turned off. The temperature rise test must reach a stable state and the test must be carried out for at least 6 hours. Step 3: After the temperature rise test is completed, the loss measurement of the high-voltage switchgear and the high-voltage connecting wire and the loss measurement of the low-voltage switchgear and the low-voltage connecting wire are immediately carried out; The specific implementation method of the loss measurement of the high-voltage switchgear and the high-voltage connecting wire in step 3 is as follows: after the temperature rise test in step 2 is completed, the loss of the high-voltage switchgear and the high-voltage connecting wire is measured by a power analyzer, and the result is uploaded through the communication unit; The specific implementation method of the loss measurement of the low-voltage switchgear and the low-voltage connecting wire in step 3 is: after the temperature rise test in step 2 is completed, the loss of the low-voltage switchgear and the low-voltage connecting wire is measured by a power analyzer, and the result is uploaded through the communication unit; Step 4: Determine the losses of all auxiliary and control circuits; The specific implementation method of step 4 is: after step 3, the power analyzer is used to measure the losses of all auxiliary and control circuits together, and the results are uploaded through the communication unit; Step 5, calculating all measured data; The specific implementation method of step 5 is: the communication unit calculates the collected no-load and load loss data of the transformer to obtain the total loss value of the transformer at 75°C, and comprehensively calculates the total loss value of the box-type substation based on the collected loss data of the high-voltage room, low-voltage room, auxiliary and control circuits, and calculates the loss ratio based on the total capacity of the box-type substation.

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