Injection type stator grounding protection auxiliary debugging device

Abstract

The utility model relates to the technical field of relay protection of main equipment of an electric power system, and provides an injection type stator grounding protection auxiliary debugging device, which comprises a DI input module used for acquiring grounding transformer high-voltage side disconnecting link closing contacts; the DO output module is used for controlling short circuit between the ground wire and the first test resistor common end of the R resistor module, short circuit between the high-voltage side of the grounding transformer and the second test resistor common end of the R resistor module, and short circuit between the ground wire and the high-voltage side of the grounding transformer; the HMI interface processing and communication module is used for human-computer interface management and communication functions; the CPU module is used for receiving an external input signal acquired by the DI input module, performing logic judgment and then driving a tripping outlet relay of the DO output module to act so as to complete injection type stator grounding static debugging sequence control flow execution; and the R resistor module provides a static test resistor for stator grounding. According to the utility model, injection type stator grounding protection on-site debugging steps are specifically simplified, the on-site debugging test difficulty is reduced, and the reliability of injection type stator grounding protection is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of relay protection of main equipment of an electric power system, in particular to an injection type stator grounding protection auxiliary debugging device. Background Art

[0002] Stator grounding is one of the most common faults in generator faults. Large generator sets all use dual-set stator grounding protection. Generally, one set uses injection stator grounding protection, and the other uses fundamental zero-sequence voltage + 3rd harmonic voltage protection stator grounding protection. Injection stator grounding protection has obvious advantages. It can still play a protective role when the generator is stationary. In theory, the sensitivity is consistent throughout the entire generator stator range, and it can reflect grounding faults with gradually decreasing grounding resistance.

[0003] At present, the principle of injection-type stator grounding protection is to connect the two ends of the load resistor on the low-voltage side of the generator grounding transformer through a 20Hz external injection power supply, and inject a 20Hz measurement signal into the generator through the load resistor. The sampling values ​​of the 20Hz voltage and 20Hz current in the measurement loop are used to calculate the measured resistance value R of the generator stator to the ground. However, due to the uncertainty of the capacitive reactance parameters and the grounding transformer impedance parameters of the generator set, many fixed values ​​must be measured on site through experiments before the injection-type stator grounding protection is put into operation, and the on-site correction process of the injection-type stator grounding protection is complicated. If the correction process is incorrect, the measurement error of the stator grounding resistance will increase after the unit is put into operation, affecting the performance of the injection-type stator grounding protection. Utility Model Content

[0004] The utility model aims to solve at least one technical problem in the background technology and provide an injection-type stator grounding protection auxiliary debugging device.

[0005] In order to achieve the above object, the utility model provides an injection type stator grounding protection auxiliary debugging device, comprising:

[0006] DI input module, used to collect the closing contact of the knife switch on the high-voltage side of the grounding transformer and transmit it to the CPU module through the high-speed bus;

[0007] The DO output module is connected to the ground wire and the high-voltage side of the ground transformer, and is used to control the short circuit between the ground wire and the first test resistor common end of the R resistor module, the high-voltage side of the ground transformer and the second test resistor common end of the R resistor module, and the ground wire and the high-voltage side of the ground transformer;

[0008] HMI interface processing and communication modules, used for human-machine interface management and communication functions;

[0009] The CPU module receives the external input signal collected by the DI input module, and drives the DO output module tripping output relay to operate after logic judgment, so as to complete the execution of the injection type stator grounding static debugging sequential control process;

[0010] The R resistance module provides a static test resistance for stator grounding.

[0011] According to one aspect of the utility model, the test resistance values ​​provided by the R resistance module include 1kΩ, 2kΩ, 3kΩ, 4kΩ, 5kΩ, 10kΩ, 15kΩ, 20kΩ, 25kΩ and 30kΩ.

[0012] According to one aspect of the utility model, it also includes: a rear plug-in chassis, in which a motherboard, a power supply module, the DI input module, the DO output module, the HMI interface processing and communication module, the CPU module and the R resistance module are installed.

[0013] According to one aspect of the utility model, the height of the rear-plug-in chassis is 4U, and the size of the rear-plug-in chassis is 177.0 mm×260.0 mm×255.0 mm.

[0014] According to one aspect of the utility model, the motherboard is provided with a power bus, an I / O control bus, a communication bus and an HMI communication line;

[0015] The power module is electrically connected to the DI input module, the DO output module, the HMI interface processing and communication module, the CPU module and the R resistance module through the power bus;

[0016] The CPU module is connected to the DI input module, the DO output module and the R resistance module through the I / O control bus;

[0017] The HMI interface processing and communication module is connected to the CPU module via the communication bus, and the panel module is connected to the HMI interface processing and communication module via the HMI communication line;

[0018] The power module, the DI input module, the DO output module, the HMI interface processing and communication module, the CPU module, and the R resistance module are all connected to the motherboard, and the panel module is installed on the front of the rear plug-in chassis and connected to the motherboard.

[0019] According to one aspect of the utility model, the HMI interface processing and communication module is provided with a human-machine interface, through which the injection-type stator grounding protection static debugging sequential control process is displayed, and sequential control process items are selected through the human-machine interface.

[0020] According to one aspect of the utility model, the CPU module receives the sequential control process item selected through the human-machine interface, executes the corresponding contact closure operations on the DO output module and the R resistance module, so as to complete the injection-type stator grounding protection static test project.

[0021] According to the scheme of the utility model, an injection-type stator grounding protection auxiliary debugging device provided by the utility model adopts a visual human-machine operation interface to simply indicate the test items required for static debugging of the injection-type stator grounding protection, and adopts a sequential control process design to guide engineering personnel to perform phase compensation tests, impedance compensation tests, parallel resistance compensation tests and resistance conversion coefficient correction test items in sequence, so as to specifically simplify the on-site debugging steps of the injection-type stator grounding protection and reduce the difficulty of on-site debugging tests, thereby improving the reliability of the injection-type stator grounding protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A three-dimensional diagram schematically showing an injection-type stator ground protection auxiliary debugging device according to an embodiment of the utility model;

[0023] Figure 2 A schematic diagram showing the internal module structure layout of an injection-type stator ground protection auxiliary debugging device according to an embodiment of the utility model;

[0024] Figure 3 A schematic diagram showing the internal module connection diagram of an injection-type stator ground protection auxiliary debugging device according to an embodiment of the utility model;

[0025] Figure 4 A schematic diagram of a wiring diagram of an injection-type stator ground protection auxiliary debugging device according to an embodiment of the utility model is shown;

[0026] Figure 5 A sequential control flow chart according to an embodiment of the present invention is schematically shown. DETAILED DESCRIPTION

[0027] The present invention will now be discussed with reference to exemplary embodiments. It should be understood that the embodiments discussed are only intended to enable those skilled in the art to better understand and implement the present invention, rather than to imply any limitation on the scope of the present invention.

[0028] As used herein, the term “including” and variations thereof are to be interpreted as open-ended terms meaning “including, but not limited to.” The term “based on” is to be interpreted as “based, at least in part, on.” The terms “one embodiment” and “an embodiment” are to be interpreted as “at least one embodiment.”

[0029] Figure 1The following is a schematic diagram of a three-dimensional diagram of an injection type stator grounding protection auxiliary debugging device according to an embodiment of the utility model. In this embodiment, the injection type stator grounding protection auxiliary debugging device is used for on-site static debugging of injection type stator grounding protection of a generator-transformer group. Figure 1 As shown, the injection-type stator grounding protection auxiliary debugging device includes a rear plug-in chassis 1. The height of the rear plug-in chassis 1 is 4U. The structural dimensions of the rear plug-in chassis 1 are 177.0mm×260.0mm×255.0mm. The rear plug-in chassis 1 is installed with a DI input module, a DO output module, an HMI interface processing and communication module, a CPU module, and an R resistance module.

[0030] Further, Figure 2 The following is a schematic diagram showing the internal module structure layout of an injection-type stator ground protection auxiliary debugging device according to an embodiment of the present utility model. Figure 2 As shown, in this embodiment, a motherboard is installed in the rear plug-in chassis 1, all modules (power supply module 7, DI input module 4, DO output module 6, HMI interface processing and communication module 2, CPU module 3 and R resistance module 5) are connected to the motherboard, and a panel module 8 is installed at the front of the chassis and connected to the motherboard.

[0031] Further, Figure 3 The following is a schematic diagram showing the internal module connection diagram of an injection-type stator ground protection auxiliary debugging device according to an embodiment of the present utility model. Figure 3 As shown, a power bus 9, an I / O control bus 10, a communication bus 11 and an HMI communication line 12 are provided on the motherboard. The power module 7 is electrically connected to the DI input module 4, the DO output module 6, the HMI interface processing and communication module 2, the CPU module 3 and the R resistor module 5 through the power bus 9; the CPU module 3 is connected to the DI input module 4, the DO output module 6 and the R resistor module 5 through the I / O control bus 10; the HMI interface processing and communication module 2 is connected to the CPU module 3 through the communication bus 11, the panel module 8 is connected to the HMI interface processing and communication module 2 through the HMI communication line 12, and the power module 7, the DI input module 4, the DO output module 6, the HMI interface processing and communication module 2, the CPU module 3 and the R resistor module 5 are all connected to the motherboard.

[0032] Among them, the rear plug-in chassis 1 adopts a single CPU module system, and the DI input module 4 transmits the acquired ground transformer high-voltage side switch position signal to the CPU module 3. The CPU module 3 receives the sequential control process items transmitted from the human-machine interface of the HMI interface processing and communication module 2, performs operations, drives the DO output module 6 to trip the outlet and the R resistance module 5 to trip the outlet, and completes event recording and communication with the HMI interface processing and communication module 2 at the same time.

[0033] In this embodiment, a total of one DI input module 4 is provided, which provides 20 input signals for collecting the closing signal of the knife switch on the high-voltage side of the grounding transformer.

[0034] In this embodiment, a total of one DO outlet module 6 is provided, providing 11 trip outlets, connected to the ground wire and the high-voltage side of the ground transformer, and used to control the short circuit between the ground wire and the first test resistor common terminal Rtest_com1 of the R resistor module 5, the high-voltage side of the ground transformer and the second test resistor common terminal Rtest_com2 of the R resistor module 5, and the ground wire and the high-voltage side of the ground transformer.

[0035] In this embodiment, there is a total of 1 R resistance module 5, which provides a static test resistance for stator grounding; the test resistance values ​​provided include 1kΩ, 2kΩ, 3kΩ, 4kΩ, 5kΩ, 10kΩ, 15kΩ, 20kΩ, 25kΩ, and 30kΩ. The first test resistance common terminal Rtest_com1 and the second test resistance common terminal Rtest_com2 on the R resistance module 5 are respectively connected to the first test resistance common terminal Rtest_com1 and the second test resistance common terminal Rtest_com2 on the DO output module 6, and any one or more test resistances can be input through the HMI interface processing and the human-machine interface of the communication module 2.

[0036] The CPU module 3 receives the human-machine interface sequential control process selection command and the input quantity collected by the DI input module 4 for logical judgment.

[0037] DO output module 6 is used to receive instructions from CPU module 3 and output switch quantity for controlling the tripping output.

[0038] The DI input module 4 is used to collect external input quantities and transmit them to the CPU module 3.

[0039] The R resistance module 5 is used to receive instructions from the CPU module 3 and output the corresponding test resistance value for the resistance conversion coefficient correction test item.

[0040] Further, Figure 4 The wiring diagram of the injection type stator ground protection auxiliary debugging device according to one embodiment of the utility model is schematically shown as follows: Figure 4 As shown, the injection-type stator grounding protection auxiliary debugging device receives the closing contact of the knife switch on the high-voltage side of the grounding transformer; outputs a tripping signal to control the short circuit between the ground wire and the first test resistor common end Rtest_com1, the high-voltage side of the grounding transformer and the second test resistor common end Rtest_com2, and the ground wire and the high-voltage side of the grounding transformer.

[0041] Further, Figure 5 The following schematically shows a sequential control flow chart according to an embodiment of the present utility model. Figure 5As shown, at the beginning of the test, when the phase angle compensation test process is executed, the injection-type stator grounding protection auxiliary debugging device automatically disconnects the earth 1 and the first test resistor common end Rtest-com1, disconnects the grounding high-voltage side 1 and the second test resistor common end Rtest-com2, disconnects the earth 2 and the grounding high-voltage side 2, and checks whether the closing contact of the knife switch on the high-voltage side of the grounding transformer is closed. When all the above conditions are met, the engineering personnel will be prompted to adjust the 20Hz voltage and 20Hz current phase angle difference compensation to 270 degrees and the 20Hz current monitoring constant on the DGT801UB generator-transformer group protection device.

[0042] When executing the impedance compensation test process, the injection-type stator grounding protection auxiliary debugging device automatically disconnects the earth 1 and the first test resistor common end Rtest-com1, disconnects the grounding high-voltage side 1 and the second test resistor common end Rtest-com2, closes the earth 2 and the grounding high-voltage side 2, and checks whether the closing contact of the knife switch on the high-voltage side of the grounding transformer is closed. When the above conditions are met, the engineering personnel will be prompted to set the resistance compensation setting, reactance compensation setting and 20Hz voltage monitoring setting on the DGT801UB generator-transformer group protection device.

[0043] When executing the parallel resistance compensation test process, the injection-type stator grounding protection auxiliary debugging device automatically disconnects the earth 1 and the first test resistor common end Rtest-com1, disconnects the grounding high-voltage side 1 and the second test resistor common end Rtest-com2, disconnects the earth 2 and the grounding high-voltage side 2, and checks whether the closing contact of the knife switch on the high-voltage side of the grounding transformer is closed. When the above conditions are met, the engineering personnel will be prompted to set the parallel resistance compensation setting on the DGT801UB generator-transformer group protection device.

[0044] When executing the resistance conversion coefficient correction test process, the injection-type stator grounding protection auxiliary debugging device automatically closes the earth 1 and the first test resistor common terminal Rtest-com1, closes the grounding high-voltage side 1 and the second test resistor common terminal Rtest-com2, disconnects the earth 2 and the grounding high-voltage side 2, and checks whether the closing contact of the grounding transformer high-voltage side knife switch is closed. When the above conditions are met, the engineering personnel will be prompted to remotely close the 10kΩ test resistor as the reference resistance value on the injection-type stator grounding protection auxiliary debugging device, and then set the resistance conversion coefficient constant value on the DGT801UB generator-transformer group protection device.

[0045] Furthermore, the engineering personnel will be prompted to remotely close 1kΩ~30kΩ on the injection-type stator grounding protection auxiliary debugging device to verify the accuracy of the injection-type stator grounding resistance measurement setting of the DGT801UB generator-transformer group protection device.

[0046] Furthermore, when the accuracy meets the 5% requirement, the test ends. If the accuracy does not meet the requirement, check whether the main wiring of the system is connected completely and then re-test.

[0047] In this embodiment, the CPU module 3 model used is E02-CPU.HQ-01 (2 SFP 100M optical ports, 1 100M electrical debugging port, 6TE).

[0048] The utility model provides an injection type stator grounding protection auxiliary debugging device, which adopts a visual human-machine operation interface, concisely indicates the test items required for static debugging of the injection type stator grounding protection, and adopts a sequential control process design to guide engineering personnel to perform phase compensation test, impedance compensation test, parallel resistance compensation test and resistance conversion coefficient correction test items in sequence, so as to specifically simplify the on-site debugging steps of the injection type stator grounding protection and reduce the difficulty of on-site debugging tests, thereby improving the reliability of the injection type stator grounding protection.

[0049] According to the scheme of the utility model, the utility model specifically simplifies the on-site debugging steps of the injection-type stator grounding protection and reduces the difficulty of on-site debugging tests, thereby improving the reliability of the injection-type stator grounding protection. The utility model adopts a visual human-machine operation interface, which is simple and convenient to operate and effectively improves work efficiency. The utility model adopts a sequential control process design to guide engineering personnel to perform phase compensation tests, impedance compensation tests, parallel resistance compensation tests, and resistance conversion coefficient correction test items in sequence, making the test process more efficient.

[0050] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the utility model.

Claims

1. Injection type stator grounding protection auxiliary debugging device, characterized in that: include: DI input module, used to collect the closing contact of the knife switch on the high-voltage side of the grounding transformer and transmit it to the CPU module through the high-speed bus; The DO output module is connected to the ground wire and the high-voltage side of the ground transformer, and is used to control the short circuit between the ground wire and the first test resistor common end of the R resistor module, the high-voltage side of the ground transformer and the second test resistor common end of the R resistor module, and the ground wire and the high-voltage side of the ground transformer; HMI interface processing and communication modules, used for human-machine interface management and communication functions; The CPU module receives the external input signal collected by the DI input module, and drives the DO output module tripping output relay to operate after logic judgment, so as to complete the execution of the injection type stator grounding static debugging sequential control process; R resistance module, provides static test resistance for stator grounding.

2. The injection type stator ground protection auxiliary debugging device according to claim 1 is characterized in that: The test resistance values ​​provided by the R resistance module include 1kΩ, 2kΩ, 3kΩ, 4kΩ, 5kΩ, 10kΩ, 15kΩ, 20kΩ, 25kΩ and 30kΩ.

3. The injection type stator ground protection auxiliary debugging device according to claim 1 is characterized in that: Also includes: A rear plug-in chassis is provided in which a motherboard, a power module, the DI input module, the DO output module, the HMI interface processing and communication module, the CPU module and the R resistance module are installed.

4. The injection type stator ground protection auxiliary debugging device according to claim 3 is characterized in that: The height of the rear-plug-in chassis is 4U, and the size of the rear-plug-in chassis is 177.0 mm×260.0 mm×255.0 mm.

5. The injection type stator ground protection auxiliary debugging device according to claim 3 is characterized in that: The motherboard is provided with a power bus, an I / O control bus, a communication bus and an HMI communication line; The power module is electrically connected to the DI input module, the DO output module, the HMI interface processing and communication module, the CPU module and the R resistance module through the power bus; The CPU module is connected to the DI input module, the DO output module and the R resistance module through the I / O control bus; The HMI interface processing and communication module is connected to the CPU module via the communication bus, and the panel module is connected to the HMI interface processing and communication module via the HMI communication line; The power module, the DI input module, the DO output module, the HMI interface processing and communication module, the CPU module, and the R resistance module are all connected to the motherboard, and the panel module is installed on the front of the rear plug-in chassis and connected to the motherboard.

6. The injection type stator ground protection auxiliary debugging device according to any one of claims 1 to 5, characterized in that: The HMI interface processing and communication module is provided with a human-machine interface, through which the static debugging sequential control process of the injection-type stator grounding protection is displayed, and the sequential control process items are selected through the human-machine interface.

7. The injection type stator ground protection auxiliary debugging device according to claim 6 is characterized in that: The CPU module receives the sequential control process item selected through the human-machine interface, and executes the corresponding contact closing operations on the DO output module and the R resistance module to cooperate in completing the injection-type stator grounding protection static test project.

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