Portable intelligent instrument for reverse power large chain test and use method

Abstract

The invention relates to the technical field of power systems, in particular to a reverse power large chain test portable intelligent instrument and a using method thereof. The reverse power large chain test portable intelligent instrument comprises a transformer which is provided with at least one primary winding and at least one secondary winding; the secondary winding is provided with a plurality of voltage regulation taps which are uniformly distributed, and the voltage regulation taps allow a user to select different output voltage grades according to needs; and a constant voltage difference is set between every two adjacent voltage adjusting taps. The portable intelligent instrument has the beneficial effects that the portable intelligent instrument is small and exquisite in overall size design, can be easily carried and operated by one person, and is very convenient to move and test in a narrow machine room space or between different generator sets. The voltage and the resistance can be flexibly adjusted through the design of a voltage adjusting tap and a variable resistance element of the transformer.

Description

Technical Field

[0001] The invention relates to the technical field of power systems, in particular to a portable intelligent instrument for a reverse power large interlocking test and a use method thereof. Background Art

[0002] At present, in the field of power plant generator protection testing, reverse power protection testing usually relies on large testers. These large testers mainly adjust the angles of voltage and current through complex circuit structures to output simulated accident states. Their circuit design is usually based on a combination of multiple heavy iron core coils and fixed resistors to build a corresponding test environment.

[0003] Disadvantages of the existing technology: Large testers are bulky and heavy, requiring a lot of manpower and material resources during handling and moving. For example, a general large tester may weigh more than 50KG, which is extremely inconvenient to use in some scenarios where space is limited or the test location needs to be changed frequently. Since the circuit structure of the large tester is relatively fixed, its adjustment accuracy is difficult to meet the needs of some high-precision tests when adjusting parameters. For example, in some generator sets that require high reverse power parameter accuracy, existing large testers may not be able to accurately simulate the actual reverse power situation. Summary of the invention

[0004] Some simplifications or omissions may be made in this section and the abstract and title of the present application to avoid obscuring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions shall not be used to limit the scope of the present invention.

[0005] The purpose of the present invention is to provide a portable intelligent instrument for reverse power large interlocking test.

[0006] Therefore, its purpose is to solve the problems of heavy equipment, inconvenient operation and inflexible parameter adjustment.

[0007] To solve the above technical problems, the present invention provides the following technical solutions: a portable intelligent instrument for reverse power large-chain test, which includes a transformer, the transformer having at least one primary winding and at least one secondary winding; the secondary winding is provided with a plurality of evenly distributed voltage adjustment taps, the voltage adjustment taps allow the user to select different output voltage levels according to needs; a constant voltage difference is set between every two adjacent voltage adjustment taps; a switching device, the switching device is connected to each voltage adjustment tap on the secondary winding, allowing the user to switch between multiple set voltage levels; a variable resistance element; connected to the transformer, and capable of continuously changing the resistance value of the transformer through mechanical operation.

[0008] As a preferred solution of the portable intelligent instrument for reverse power large chain test of the present invention, wherein: the transformer includes a shell, and the shell is used to accommodate the transformer and provide isolation.

[0009] As a preferred solution of the portable intelligent instrument for reverse power large-scale interlocking test of the present invention, the transformer also includes an indicating device, such as an LED indicator light or a liquid crystal display screen, for displaying the currently selected voltage gear and the actual output voltage value.

[0010] As a preferred solution of the portable intelligent instrument for reverse power large-chain test of the present invention, the transformer includes a safety protection circuit, and the safety protection circuit includes a fuse, a circuit breaker, an overheat protection element and an overvoltage protection element.

[0011] As a preferred solution of the portable intelligent instrument for reverse power large-scale interlocking test of the present invention, the transformer also includes at least one data interface for establishing an electrical connection with the generator set protection device; an AC power input interface adapted to access a standard AC 220 volt power network.

[0012] As a preferred solution of the portable intelligent instrument for reverse power large-scale interlocking test of the present invention, the variable resistance element includes a wirewound resistor, a carbon film resistor or other resistance materials suitable for continuous resistance value change.

[0013] As a preferred solution of the portable intelligent instrument for reverse power large-scale interlocking test of the present invention, the variable resistance element also includes a locking mechanism to ensure that the resistance value will not change due to external interference after being set.

[0014] As a preferred solution of the portable intelligent instrument for reverse power large-chain test of the present invention, the variable resistance element is connected in series with the transformer in the circuit, and the variable resistance element changes the series resistance in the circuit through physical operation (such as sliding or rotating).

[0015] As a preferred solution of the portable intelligent instrument for reverse power large-scale chain test of the present invention, the variable resistance element includes a test instrument module connected to the circuit for real-time detection of the current intensity in the circuit and the phase difference between voltage and current.

[0016] As a preferred solution of the portable intelligent instrument for reverse power large interlocking test of the present invention, wherein:

[0017] In order to solve the above technical problems, the present invention also provides the following technical solutions: a method for using a portable intelligent instrument for a reverse power large interlocking test, comprising a portable intelligent instrument for a reverse power large interlocking test, and,

[0018] The transformer uses a special test cable to connect the generator set's protection device and confirm that all interfaces are firmly connected;

[0019] Connect the transformer to an AC 220V power source and ensure that the transformer can start and operate normally;

[0020] The analog voltage is set according to the reverse power protection characteristics of the generator set, and the output voltage is made to accurately match the action voltage of the reverse power protection of the generator set by adjusting the voltage adjustment tap of the transformer;

[0021] Adjust the variable resistance element to simulate different current magnitudes and voltage and current phase angles of the generator set under reverse power state;

[0022] An external test instrument module is used to monitor changes in the output signal, and the resistance value is repeatedly adjusted according to actual needs until the target current and voltage-current phase angle displayed by the test instrument meet the predetermined standards.

[0023] The beneficial effects of the present invention are as follows: the overall size of the portable intelligent instrument of the present invention is compact and can be easily carried and operated by one person, and it is extremely convenient whether in a narrow machine room space or when moving the instrument between different generator sets for testing.

[0024] In actual power plant environments, testers often need to operate in complex on-site environments. The compact design of the present invention allows testers to conveniently perform tests in various space-constrained areas (such as small spaces near generator sets) without the need for special handling equipment or multi-person collaboration.

[0025] The voltage and resistance can be flexibly adjusted through the design of the voltage adjustment tap and variable resistance element of the transformer. Compared with the existing large-scale testers, this adjustment method is more flexible and diverse. For example, when facing generator sets of different models and powers, the output parameters of the test equipment can be quickly adjusted according to their specific reverse power parameter requirements, without the need for complex circuit reconfiguration like large-scale testers. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0027] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention.

[0028] Figure 2 It is the transformer principle diagram in the present invention.

[0029] In the figure:

[0030] 100. Transformer; 101. Primary winding; 102. Secondary winding; 103. Voltage adjustment tap; 104. Variable resistance element; 105. Housing. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0032] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0033] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0034] Example 1

[0035] Reference Figure 1-2 , which is the first embodiment of the present invention, and provides a portable intelligent instrument for reverse power large-chain test, including a transformer 100, the transformer 100 has at least one primary winding 101 and at least one secondary winding 102; a plurality of uniformly distributed voltage adjustment taps 103 are provided on the secondary winding 102, and the voltage adjustment taps 103 allow the user to select different output voltage levels as needed; a constant voltage difference is set between every two adjacent voltage adjustment taps 103, preferably 5 volts; a switching device, the switching device is connected to each voltage adjustment tap 103 on the secondary winding 102, allowing the user to switch between multiple set voltage levels; a variable resistance element 104; connected to the transformer 100, and capable of continuously changing the resistance value of the transformer 100 through mechanical operation.

[0036] In this embodiment, the transformer 100 is responsible for converting the input AC power into a specific voltage level required by the user. The transformer 100 has at least one primary winding 101 and at least one secondary winding 102, wherein the primary winding 101 is used to receive the input voltage from the power supply, and the secondary winding 102 is used to output the adjusted voltage. In order to meet different test requirements, five or more voltage adjustment taps 103 are designed on the secondary winding 102, and the voltage adjustment taps 103 are evenly distributed on the secondary winding 102, so that the user can select different output voltage levels according to actual needs.

[0037] Among them, the primary winding 101: This is the first winding of the transformer 100, which is directly connected to the power supply and receives the input voltage. When the alternating current passes through the primary winding 101, an alternating magnetic field is generated around the winding. The rate of change of this magnetic field determines the magnitude of the voltage induced in the secondary winding 102.

[0038] Secondary winding 102: This is the second winding of the transformer 100. It has no direct electrical connection with the primary winding 101, but through magnetic coupling, when the current in the primary winding 101 changes, a current is induced in the secondary winding 102. The secondary winding 102 is usually used to connect a load or a further circuit, and the voltage it provides depends on the turns ratio of the primary winding 101 and the secondary winding 102.

[0039] A constant voltage difference is set between each voltage adjustment tap 103, and this difference is preferably 5 volts. Such a design allows the user to obtain different voltage levels required by simple operation without changing the device. This flexibility is very useful for applications that need to be tested under different voltage conditions.

[0040] The voltage adjustment taps 103 refer to some additional connection points set on the windings of the transformer 100, which allow the user to select different voltage output levels as needed. The voltage adjustment taps 103 are usually evenly distributed on one side of the transformer 100 (usually the high voltage side or the low voltage side), so that the output voltage of the transformer 100 can be fine-tuned by selecting different voltage adjustment taps 103.

[0041] In order to enable the user to freely switch between multiple set voltage levels, this embodiment introduces a switch device. This switch device is connected to each voltage adjustment tap 103 on the secondary winding 102, and the user can select different voltage output gears by operating this device. This design not only simplifies the user's operation process, but also improves the safety of the device, because only one voltage adjustment tap 103 can be in working state at a time, avoiding problems that may be caused by multiple paths being turned on at the same time.

[0042] In addition to the above components, the device is also equipped with a variable resistance element 104. This element is directly connected to the transformer 100 and can continuously change its resistance value through mechanical operation. The purpose of this design is that users can use this feature to simulate different load conditions and thus more accurately evaluate the performance of the power system. For example, when performing reverse power testing, the resistance value can be adjusted to simulate various load conditions that may occur in the system.

[0043] When the user is ready to start the reverse power large interlock test, he first needs to select a suitable output voltage level according to the experimental requirements, which is usually done by operating the switch device. After the voltage is selected, the power supply will supply power to the primary winding 101 of the transformer 100. At this time, the current passes through the electromagnetic induction inside the transformer 100, and generates a corresponding voltage output on the secondary winding 102. The user can further use the variable resistance element 104 to adjust the load conditions as needed to better simulate the behavior of the power system in the actual application environment.

[0044] Secondly, the size of the invention is preferably within 30cm×20cm×10cm, which not only enables it to meet the operation requirements of small spaces such as machine rooms, but also facilitates the carrying of technicians between different work locations. Its weight of about 1KG further enhances portability, allowing a single person to complete the handling and operation.

[0045] In another embodiment, the primary winding 101 and the secondary winding 102 adopt a multi-layer foil structure, which can further reduce energy loss by reducing the eddy current effect. The conventional round wire winding will cause the current to flow on the outer surface due to the skin effect under high frequency conditions, thereby increasing the resistance loss. The foil structure can effectively reduce this phenomenon due to its flat characteristics, making the current distribution more uniform, thereby reducing eddy current loss.

[0046] In addition, the foil structure also allows for tighter winding, which helps to increase the magnetic flux density and reduce the leakage flux of the magnetic circuit. This not only improves efficiency, but also makes the transformer 100 more compact.

[0047] The basic working principle of the transformer 100 is based on the law of electromagnetic induction. When alternating current passes through the primary winding 101, an alternating magnetic field is generated in the iron core. This magnetic field induces an electromotive force in the secondary winding 102, thereby generating current. In this embodiment, by optimizing the iron core material and adopting a multi-layer foil structure, energy loss is effectively reduced and energy conversion efficiency is improved. At the same time, the modular secondary winding 102 design enables the transformer 100 to better adapt to the voltage regulation requirements in different scenarios, thereby enhancing the applicability and economy of the system.

[0048] Example 2

[0049] Reference Figure 1-2, which is the second embodiment of the present invention, and this embodiment provides a portable intelligent instrument for reverse power large interlocking test. The transformer 100 also includes at least one data interface for establishing an electrical connection with the generator set protection device; an AC power input interface adapted to access a standard AC 220 volt power network. The variable resistance element 104 includes a wire-wound resistor, a carbon film resistor or other resistance materials suitable for continuous resistance change. The variable resistance element 104 is connected in series with the transformer 100 in the circuit. The variable resistance element 104 changes the series resistance in the circuit through physical operations such as sliding or rotating; the variable resistance element 104 includes a test instrument module, which is connected to the circuit and is used to detect the current intensity in the circuit and the phase difference between the voltage and the current in real time. The transformer 100 also includes an indicator device, such as an LED indicator or a liquid crystal display, for displaying the currently selected voltage gear and the actual output voltage value.

[0050] In this embodiment, the data interface is used to electrically connect to the generator set protection device. This electrical connection enables the present invention to read the status information of the generator set and adjust its own settings as needed, thereby achieving more accurate reverse power simulation. In addition, the data interface can also be used to upload the test results to a central management system or storage device for further analysis.

[0051] The AC power input interface allows users to connect the device directly to a standard 220-volt AC power network, ensuring the device's ease of operation and portability. This design not only simplifies the on-site deployment process, but also reduces the risk of operational interruption due to battery exhaustion.

[0052] The variable resistor element 104 may be a wire wound resistor, a carbon film resistor, or any other suitable technology for achieving continuous resistance change. These components are connected in series with the transformer 100 in the circuit, and the resistance value in the circuit can be adjusted by physical operation (such as sliding or rotating). This feature gives the user the ability to flexibly adjust the resistance according to specific test requirements, thereby simulating different load conditions.

[0053] The test instrument module is integrated into the circuit to monitor and record key parameters such as current intensity and the phase difference between voltage and current in real time. In addition, the module may also have a data recording function to facilitate subsequent data processing and analysis.

[0054] In order to facilitate the user to understand the working status of the device, the present invention is also equipped with an indicator device, such as an LED indicator light or a liquid crystal display screen. These indicator devices can display the currently selected voltage level and the actual output voltage value, helping the operator to quickly confirm whether the setting is correct and monitor the operation of the device.

[0055] When the device is started, the user first establishes contact with the generator set protection device through the data interface and then selects the appropriate AC power input. Next, the required load conditions are set by operating the variable resistance element 104. During this process, the test instrument module continuously monitors the current and voltage in the circuit and calculates the phase difference between them. At the same time, the indicator device displays the current voltage setting and the actual output to help the user verify the validity of the setting.

[0056] Example 3

[0057] Reference Figure 1-2 , which is the third embodiment of the present invention, and provides a portable intelligent instrument for reverse power large interlocking test. The transformer 100 includes a housing 105, and the housing 105 is used to accommodate the transformer 100 and provide isolation. The safety protection circuit includes a fuse, a circuit breaker, an overheat protection element, and an overvoltage protection element. The variable resistance element 104 also includes a locking mechanism to ensure that the resistance value will not change due to external interference after being set.

[0058] In this embodiment, the housing 105 not only provides physical protection for the transformer 100 inside, but also plays a role of electrical isolation. The housing 105 is usually made of non-conductive materials, such as high-strength plastic or composite materials, to prevent the external environment from affecting the internal components. The design of the housing 105 also takes heat dissipation performance into consideration, and ensures that the internal temperature is within a safe range through a reasonable ventilation hole design.

[0059] When the user needs to adjust the resistance value, the sliding contact can be moved to the desired position by, for example, turning a knob. At this time, the locking mechanism is inactive, allowing the user to freely adjust the resistance value. Once the desired resistance value is determined, the locking mechanism, such as using micro clips, can be fixed at different positions of the sliding contact to accommodate different resistance value settings. The clips are designed to be elastic and can tightly grasp the sliding contact. Thus, the sliding contact is fixed in the current position. In this way, even if the environmental conditions change, the sliding contact is not easy to move, thereby ensuring the stability of the resistance value.

[0060] How to use the portable intelligent instrument for reverse power large chain test: First, the technician needs to connect the test cable dedicated to this device to the protection device of the generator set, and ensure that all interfaces are in close contact to avoid signal interference or disconnection. Then, connect the AC 220V power supply to ensure that the device can start and run normally.

[0061] Voltage Regulation

[0062] After the connection is completed, the analog voltage needs to be set according to the reverse power protection characteristics of the generator set. This process usually involves the voltage adjustment tap 103 of the transformer 100 inside the present invention. Through precise adjustment, the output voltage of the transformer 100 can match the trigger voltage required for the reverse power protection action of the generator set. For example, if the action voltage of the reverse power protection is 100V, the position of the voltage adjustment tap 103 needs to be adjusted to ensure that the output voltage reaches this value.

[0063] Resistance adjustment

[0064] Next, the technician needs to adjust the variable resistance element 104 of the present invention to simulate the different current magnitudes and voltage-current phase angles that may occur in the generator set under the reverse power state. This step may require the use of an external test instrument module (such as an oscilloscope, ammeter, etc.) to monitor the changes in the output signal and achieve the desired effect by repeatedly adjusting the resistance value. For example, in the simulated reverse power state, if the target current is 5A and the voltage-current phase angle is 120°, the resistance should be adjusted until the test instrument displays the corresponding current value and phase angle.

[0065] Once all parameters are set correctly, the present invention can send a simulated reverse power signal to the protection device of the generator set. At this time, it is observed whether the protection device can make the correct response within the predetermined time - that is, cut off the connection between the generator and the grid. This step not only verifies the function of the protection device, but also verifies whether its reaction speed meets expectations.

[0066] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0067] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0068] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0069] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. Portable intelligent instrument for reverse power large interlocking test, characterized by: include, A transformer (100), the transformer (100) having at least one primary winding (101) and at least one secondary winding (102); The secondary winding (102) is provided with a plurality of evenly distributed voltage adjustment taps (103), and the voltage adjustment taps (103) allow a user to select different output voltage levels as required; A constant voltage difference is set between every two adjacent voltage adjustment taps (103); a switch device connected to each voltage adjustment tap (103) on the secondary winding (102) to allow a user to switch between a plurality of set voltage levels; A variable resistance element (104) is connected to the transformer (100) and is capable of continuously changing the resistance value of the transformer (100) through mechanical operation.

2. The portable intelligent instrument for reverse power large interlocking test as claimed in claim 1, characterized in that: The transformer (100) comprises a housing (105) for accommodating the transformer (100) and providing isolation.

3. The portable intelligent instrument for reverse power large interlocking test as claimed in claim 2, characterized in that: The transformer (100) further comprises an indicating device, such as an LED indicator light or a liquid crystal display screen, for displaying the currently selected voltage level and the actual output voltage value.

4. The portable intelligent instrument for reverse power large interlocking test as claimed in claim 3, characterized in that: The transformer (100) comprises a safety protection circuit, which comprises a fuse, a circuit breaker, an overheat protection element and an overvoltage protection element.

5. The portable intelligent instrument for reverse power large interlocking test as claimed in claim 4, characterized in that: The transformer (100) further comprises: At least one data interface for establishing electrical connection with a generator set protection device; The AC power input interface is suitable for accessing a standard AC 220 volt power network.

6. The portable intelligent instrument for reverse power large interlocking test as claimed in claim 1, characterized in that: The variable resistance element (104) comprises a wire-wound resistor, a carbon film resistor or other resistance materials suitable for continuous resistance value variation.

7. The portable intelligent instrument for reverse power large interlocking test as claimed in claim 6, characterized in that: The variable resistance element (104) also includes a locking mechanism to ensure that the resistance value will not change due to external interference after being set.

8. The portable intelligent instrument for reverse power large interlocking test as claimed in claim 7, characterized in that: The variable resistance element (104) is connected in series with the transformer (100) in the circuit, and the variable resistance element (104) changes the series resistance in the circuit through physical operation (such as sliding or rotating).

9. The portable intelligent instrument for reverse power large interlocking test as claimed in claim 8, characterized in that: The variable resistance element (104) comprises a test instrument module connected to the circuit and used for real-time detection of the current intensity and the phase difference between the voltage and the current in the circuit.

10. The method of using the portable intelligent instrument for reverse power large interlocking test is characterized by: The invention comprises a portable intelligent instrument for reverse power large interlocking test as described in any one of claims 1 to 9, and The transformer uses a special test cable to connect the generator set's protection device and confirm that all interfaces are firmly connected; Connect the transformer to an AC 220V power source and ensure that the transformer can start and operate normally; The analog voltage is set according to the reverse power protection characteristics of the generator set, and the output voltage is made to accurately match the action voltage of the reverse power protection of the generator set by adjusting the voltage adjustment tap of the transformer; Adjust the variable resistance element to simulate different current magnitudes and voltage and current phase angles of the generator set under reverse power state; An external test instrument module is used to monitor changes in the output signal, and the resistance value is repeatedly adjusted according to actual needs until the target current and voltage-current phase angle displayed by the test instrument meet the predetermined standards.

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