Method for verifying applicability of safe and controllable domestic protection equipment for 1000kV extra-high voltage transformer substation

Abstract

The invention discloses a safety controllable domestic protection equipment applicability verification method for a 1000kV extra-high voltage transformer substation. In a 1000kV extra-high voltage transformer substation, on the premise that existing devices are not transformed, the field area is not increased, and the actual operation protection device is not affected, the domestic protection device to be detected and the protection device in actual use are connected in a homologous mode, and the output of the domestic protection device is connected to a fault oscilloscope. Through comparative analysis of wave recording signals of the fault wave recorder, actual action exit conditions and action time of various protection devices under the fault condition are reasonably reproduced, whether gaps and defects exist between domestic protection equipment and conventional devices or not can be verified, and normal operation of an actual power transmission network is not affected. And a good platform and a good way are provided for verifying the performance of domestic protection equipment in practice.

Description

Technical Field

[0001] The present application relates to a high-voltage substation, and in particular to a method and system for verifying the applicability of safe and controllable domestic protection equipment for a 1000kV ultra-high voltage substation. Background Art

[0002] Chips are the core hardware of secondary equipment in power systems.

[0003] The problems of the secondary power system are concentrated on the core chips of equipment manufacturing, such as CPU / DSP, FPGA, ADC, etc. Considering the current international situation, the risks of the secondary power system are becoming increasingly serious. It is urgent to develop ultra-high voltage safe and controllable secondary protection equipment, verify its performance and reliability, and increase its application efforts to truly increase the risk resistance of the secondary power system, power grid safety and even the entire industrial system.

[0004] Although some manufacturers have developed domestic chip protection equipment, in addition to the type test of single equipment, there is still a lack of effective means to verify the overall protection system, especially to verify its effectiveness and reliability in actual substations.

[0005] Taking into account the importance of 1000kV substation, the relay protection system currently uses a double-set protection configuration for the 1000kV part, 500kV part, 1000kV main transformer, 1000kV reactor, and 110kV busbar part, and a single-set protection configuration for other parts.

[0006] As for the safe and controllable domestic protection equipment, although it has been tested and inspected in the laboratory, some stations only have independent safe and controllable domestic protection equipment online test operation, but there is no large-scale and systematic application. It is impossible to verify whether the adjacent protections and the main protection and backup protection can cooperate correctly in the event of a fault. There is still a lack of effective and feasible methods for the systematic verification of the entire safe and controllable domestic protection system.

[0007] Therefore, it is particularly important to apply safe and controllable domestic protection equipment in actual substations to ensure the safe, reliable and stable operation of substations in operation and to provide real feedback on the reliability and stability of safe and controllable domestic protection equipment.

[0008] 1000kV UHV substation is extremely important for national production and life due to its large scale and huge investment. However, due to the insulation requirements of high-voltage equipment, site restrictions and other factors, the actual 1000kV substation cannot provide independent analog input components for safe and controllable domestic protection equipment, including: current transformer (CT) and voltage transformer (PT). Therefore, it is necessary to study a set of effective verification methods and systems in the actual operation of 1000kV UHV substations. Summary of the invention

[0009] The purpose of this application is to provide a method and system for verifying the applicability of a safe and controllable domestic protection device for a 1000kV ultra-high voltage substation.

[0010] The present application discloses a method for verifying the suitability of a safe and controllable domestic protection device for a 1000kV UHV substation, the verification method comprising the following steps:

[0011] (1) Determine the electrical components that need to be verified

[0012] Determine the principle of relay protection according to the power element protected by the domestic protection device to be verified, determine whether to configure redundant relay protection and perform step 2 according to the specific situation

[0013] (2) Connecting domestic protection devices

[0014] According to the specific relay protection configuration of the power element, the domestic protection device is connected. When it is a single-bay single-set protection, the domestic protection device is configured to have the same source input as the first set of protection devices. When the relay protection configuration of the power element is a single-bay double-set protection, the domestic protection device is configured to have the same source input as the second set of protection devices. After the sampling voltage is connected to the second set of protection devices, the outputs of all protection devices are then connected to the fault filter.

[0015] (3) Start tripping and collect signals

[0016] Start the tripping output circuit, disconnect the controlled circuit breaker device, and send the protection action signal to the fault recording device; at this time, since the domestic protection device and the protection device use the same source input, the fault type can be correctly identified and acted correctly, and since its output is connected to the fault filter, the protection action signal is only sent to the fault recording device, and the circuit breaker device is not tripped, thereby avoiding malfunction affecting the normal power system;

[0017] (4) Signal comparison to verify performance

[0018] By comparing and analyzing the recorded signals of the fault recorder, the actual action output conditions and action times of various protection devices under fault conditions are reproduced, thereby verifying the performance differences between domestic protection devices and conventional devices.

[0019] In a preferred example, the step (2) specifically also includes step 2a: when the power element is cross-interval safety protection, a whole set of related power elements are reselected as the verification system.

[0020] In a preferred example, it is characterized in that the verification system specifically needs to meet the following requirements: 1. The power elements are complete, involving various relay protection devices; 2. The power elements are interrelated, and the coordination relationship and performance of various relay protection devices can be verified; 3. It does not affect the safe operation of existing relay protection devices, and ensures the reliable and stable operation of existing substations.

[0021] In a preferred embodiment, the homologous input is realized by connecting the sampling current of the domestic protection device in series to the corresponding protection device, and connecting the sampling voltage in parallel to the corresponding protection device. The advantages of the present invention are:

[0022] (1) A systematic solution is proposed on how to verify the domestic protection devices in 1000 kV UHV substations without modifying the existing devices, increasing the site area, or affecting the actual operation of the protection devices.

[0023] (2) By comparing and analyzing the recorded signals of the fault recorder, the actual operation output conditions and operation time of various protection devices under fault conditions are reasonably reproduced. This can not only verify whether there are gaps and shortcomings between domestic protection devices and conventional devices, but also does not affect the normal operation of the actual power transmission network. It provides a good platform and method for verifying the performance of domestic protection devices in practice.

[0024] (3) The present invention is applicable to 1000 kV UHV substations, is original, and can be further extended to application scenarios of substations of various voltage levels. It is an important practice to explore new verification schemes.

[0025] The specification of the present application records a large number of technical features, which are distributed in various technical solutions. If all possible combinations of technical features of the present application (i.e., technical solutions) are to be listed, the specification will be too long. In order to avoid this problem, the various technical features disclosed in the above-mentioned invention content of the present application, the various technical features disclosed in the various embodiments and examples below, and the various technical features disclosed in the accompanying drawings can be freely combined with each other to form various new technical solutions (these technical solutions should all be regarded as having been recorded in this specification), unless the combination of such technical features is technically infeasible. For example, in one example, feature A+B+C is disclosed, and in another example, feature A+B+D+E is disclosed, and features C and D are equivalent technical means that play the same role. Technically, only one can be used, and it is impossible to use them at the same time. Feature E can be combined with feature C technically. Then, the solution of A+B+C+D should not be regarded as having been recorded because it is technically infeasible, and the solution of A+B+C+E should be regarded as having been recorded. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is the main wiring diagram of 1000kV UHV substation commonly used in the prior art;

[0027] Figure 2 It is a schematic diagram of the verification principle of the coordination between a domestic protection device and a single set of protection according to an embodiment of the present invention.

[0028] Figure 3 It is a schematic diagram of the verification principle of the coordination between the domestic protection device and the double-set protection according to an embodiment of the present invention.

[0029] Figure 4 It is a schematic diagram of the verification of the cross-interval safe and controllable domestic protection equipment device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0030] After in-depth research and extensive screening, the inventor has developed a systematic solution for verifying domestic protection equipment in a 1000kV UHV substation without modifying existing equipment, increasing site area, or affecting the actual operation of protection devices. Through comparative analysis of the recording signals of the fault recorder, the actual action exit conditions and action time of various protection devices under fault conditions are reasonably reproduced, which can verify whether there are gaps and deficiencies between domestic protection equipment and conventional equipment, and does not affect the normal operation of the actual power transmission network, providing a good platform and way for domestic protection equipment to verify performance in practice.

[0031] the term

[0032] Domestic protection device

[0033] The "domestic protection device" and "domestic protection equipment device" in this application have the same meaning and refer to the same device.

[0034] Verification of single-compartment single-set protection and single-set safe and controllable domestic protection equipment

[0035] When the relay protection device adopts a single set of protection, a second set of safe and controllable domestic protection equipment is configured, and its sampling current is connected in series to the first set of protection devices, and the sampling voltage is connected in parallel to the first set of protection devices. When a fault occurs, the first set of protection acts, starts the tripping exit circuit, disconnects the controlled circuit breaker equipment, and sends the protection action signal to the fault recording device; at this time, since the safe and controllable protection device uses the same source input as the first set of protection, it can correctly identify the fault type and act correctly, but in order to avoid the protection from malfunctioning and affecting the normal operation of the power system, the protection action signal is only sent to the fault recording device, and the circuit breaker equipment is not tripped. By comparing the action signals of different protection devices in the fault recording, the difference between the domestic protection device and the actual operating protection device can be verified, and the effectiveness and reliability of the domestic protection device can be verified. .

[0036] Verification of single-compartment double-set protection and single-set safe and controllable domestic protection equipment

[0037] When the relay protection device adopts single-interval double-set protection, a third set of safe and controllable domestic protection equipment is configured, and its sampling current is connected in series to the second set of protection devices, and the sampling voltage is connected in parallel to the second set of protection devices. When a fault occurs, the first and second sets of protections are activated, the tripping exit circuit is started, the controlled circuit breaker equipment is disconnected, and the protection action signal is sent to the fault recording device; at this time, since the safe and controllable protection device uses the same source input as the second set of protection, it can correctly identify the fault type and act correctly, but in order to avoid the protection from malfunctioning and affecting the normal operation of the power system, the protection action signal is only sent to the fault recording device, and the circuit breaker equipment is not tripped. By comparing the action signals of different protection devices in the fault recording, the difference between the domestic protection device and the actual operating protection device can be verified, and the effectiveness and reliability of the domestic protection device can be verified.

[0038] Verification of safe and controllable domestic protection equipment across intervals

[0039] There are many kinds of power components in 1000kV UHV substations, which need to be equipped with different relay protection devices. There is a cooperative relationship between different types of relay protection devices.

[0040] by Figure 4Taking the coordination relationship as an example, the circuit breaker protection of the 1000kV circuit breaker needs to be started by the adjacent line protection or main transformer protection failure, so it is necessary to configure the related line protection, main transformer protection, and circuit breaker protection in the same string. When the main transformer fails, the main transformer protection starts the output action contact and sends a start failure signal to the 1000kV circuit breaker protection; the same is true when the line fails. Therefore, in the actual operation of the 1000kV UHV substation, a complete set of related power components must be selected as the verification system. Figure 1 As shown in the circled part, select #3 main transformer and the circuit breakers and lines containing parallel reactors associated with the high and medium voltage sides of the main transformer, and select a group of capacitors and a group of reactors on a busbar on the low voltage side of the main transformer. The specific selection range and verification method meet the following requirements:

[0041] 1) Complete power components, including various relay protection devices;

[0042] 2) The power components are interrelated, and the coordination relationship and performance of various relay protection devices can be verified;

[0043] 3) It does not affect the safe operation of existing relay protection equipment and ensures the reliable and stable operation of existing substations.

[0044] Example 1

[0045] An embodiment of the present application is Figure 2 Specifically, the verification is performed through the following steps:

[0046] The verification method comprises the following steps:

[0047] (1) Determine the electrical components that need to be verified

[0048] In this embodiment, Figure 2 As shown, it is a single-bay single-set protection, so there is no need to select the power components of the system, and you can directly select the power components protected by the domestic protection equipment.

[0049] (2) Connecting domestic protection devices

[0050] Since it has been determined that it is a single-interval single-set protection, the domestic protection device is configured with the sampling current of the domestic protection device connected in series to the first protection device, and the sampling voltage is connected in parallel to the first protection device;

[0051] (3) Start tripping and collect signals

[0052] Start the tripping output circuit, disconnect the controlled circuit breaker device, and send the protection action signal to the fault recording device; at this time, since the domestic protection device and the protection device use the same source input, the fault type can be correctly identified and acted correctly, and since its output is connected to the fault filter, the protection action signal is only sent to the fault recording device, and the circuit breaker device is not tripped, thereby avoiding malfunction affecting the normal power system;

[0053] (4) Signal comparison to verify performance

[0054] By comparing and analyzing the recorded signals of the fault recorder, the actual action exit conditions and action times of the first protection device and the domestic protection device under fault conditions are reproduced, thereby verifying the performance differences between the domestic protection device and the conventional device.

[0055] Example 2

[0056] An embodiment of the present application is Figure 3 Specifically, the verification is performed through the following steps:

[0057] The verification method comprises the following steps:

[0058] (1) Determine the electrical components that need to be verified

[0059] In this embodiment, Figure 3 As shown, it is a single-bay double-set protection, so there is no need to select the power components of the system, and you can directly select the power components protected by the domestic protection equipment.

[0060] (2) Connecting domestic protection devices

[0061] Since it has been determined that it is a single-interval single-set protection, the domestic protection device is configured with the sampling current of the domestic protection device connected in series to the second protection device, and the sampling voltage is connected in parallel to the second protection device;

[0062] (3) Start tripping and collect signals

[0063] Start the tripping output circuit, disconnect the controlled circuit breaker device, and send the protection action signal to the fault recording device; at this time, since the domestic protection device and the protection device use the same source input, it can correctly identify the fault type and act correctly, and since its output is connected to the fault filter.

[0064] (4) Signal comparison to verify performance

[0065] By comparing and analyzing the recorded signals of the fault recorder, the actual action exit conditions and action times of the first protection device, the second protection device and the domestic protection device under fault conditions are reproduced, thereby verifying the performance differences between the domestic protection devices and the conventional devices.

[0066] Example 3

[0067] An embodiment of the present application is Figure 4 Specifically, the verification is performed through the following steps:

[0068] The verification method comprises the following steps:

[0069] (1) Determine the electrical components that need to be verified

[0070] In this embodiment, Figure 4 As shown, it is a cross-interval protection, so the power components of the system need to be reselected. Taking this embodiment as an example, the main transformer protection cabinet, line protection cabinet and circuit breaker protection cabinet are selected as a complete verification system, which aims to trigger the protection device of the circuit breaker protection cabinet only when the main transformer protection cabinet and the line protection cabinet both start failure.

[0071] (2) Connecting domestic protection devices

[0072] Since the power component to be verified is the protection device of the circuit breaker cabinet, the domestic protection device is connected to the protection device of the circuit breaker cabinet;

[0073] (3) Start tripping and collect signals

[0074] Start the tripping output circuit, disconnect the controlled circuit breaker device, so that it can completely trigger the protection device of the circuit breaker cabinet and send the protection action signal to the fault recording device; at this time, since the domestic protection device and the protection device use the same source input, it can correctly identify the fault type and act correctly, and since its output is connected to the fault filter.

[0075] (4) Signal comparison to verify performance

[0076] By comparing and analyzing the recorded signals of the fault recorder, the actual action exit conditions and action times of the first protection device, the second protection device and the domestic protection device under fault conditions are reproduced, thereby verifying the performance differences between the domestic protection devices and the conventional devices.

[0077] It is worth noting that the complete verification system in this embodiment is selected from the following table:

[0078]

[0079] Table 1 Verification system scope

[0080] It should be noted that in the application documents of this patent, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one" do not exclude the existence of other identical elements in the process, method, article or device including the elements. In the application documents of this patent, if it is mentioned that an action is performed according to an element, it means that the action is performed at least according to the element, which includes two situations: performing the action only according to the element, and performing the action according to the element and other elements. Expressions such as multiple, multiple, and multiple include 2, 2 times, 2 kinds, and more than 2, more than 2 times, and more than 2 kinds.

[0081] This specification includes combinations of the various embodiments described herein. Individual references to "one embodiment" or a particular embodiment, etc., do not necessarily refer to the same embodiment; however, these embodiments are not mutually exclusive unless indicated as mutually exclusive or clear to those skilled in the art. It should be noted that the word "or" is used in this specification in a non-exclusive sense unless the context clearly indicates or requires otherwise.

[0082] All documents mentioned in this application are considered to be included in the disclosure of this application as a whole, so that they can be used as the basis for modification when necessary. In addition, it should be understood that after reading the above disclosure of this application, those skilled in the art can make various changes or modifications to this application, and these equivalent forms also fall within the scope of protection claimed in this application.

Claims

1. A method for verifying the applicability of a safe and controllable domestic protection device for a 1000kV UHV substation, characterized in that: The verification method The steps include: (1) Determine the electrical components that need to be verified Determine the principle of relay protection according to the power element protected by the domestic protection device to be verified, determine whether to configure redundant relay protection and perform step 2 according to the specific situation (2) Connecting domestic protection devices According to the specific relay protection configuration of the power element, the domestic protection device is connected. When it is a single-bay single-set protection, the domestic protection device is configured to have the same source input as the first set of protection devices. When the relay protection configuration of the power element is a single-bay double-set protection, the domestic protection device is configured to have the same source input as the second set of protection devices. After the sampling voltage is connected to the second set of protection devices, the outputs of all protection devices are then connected to the fault filter. (3) Start tripping and collect signals Start the tripping output circuit, disconnect the controlled circuit breaker device, and send the protection action signal to the fault recording device; at this time, since the domestic protection device and the protection device use the same source input, the fault type can be correctly identified and acted correctly, and since its output is connected to the fault filter, the protection action signal is only sent to the fault recording device, and the circuit breaker device is not tripped, thereby avoiding false operation affecting the normal power system; (4) Signal comparison to verify performance By comparing and analyzing the recorded signals of the fault recorder, the actual action output conditions and action times of various protection devices under fault conditions are reproduced, thereby verifying the performance differences between domestic protection equipment and conventional equipment.

2. The verification method according to claim 1, characterized in that: The step (2) specifically also includes step 2a: when the power element is cross-interval safety protection, a whole set of related power elements are reselected as the verification system.

3. The verification method according to claim 2, characterized in that The verification system specifically needs to meet the following requirements:

1. The power components are complete, involving various relay protection devices; 2. The power components are interrelated, and the coordination relationship and performance of various relay protection devices can be verified; 3. It does not affect the safe operation of existing relay protection equipment and ensures the reliable and stable operation of existing substations.

4. The verification method according to claim 1, characterized in that The homologous input is achieved by connecting the sampling current of the domestic protection device in series with the corresponding protection device, and connecting the sampling voltage in parallel with the corresponding protection device.

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