CN111337790A - A real mirror test platform for distribution network and detection method for primary and secondary integrated power distribution equipment - Google Patents

Abstract

The invention discloses a distribution network real mirror test platform and a detection method for primary and secondary integrated power distribution equipment. The distribution network real mirror test platform includes a power supply, cable lines, overhead lines, switch cabinets, a complete set of neutral point grounding devices and a pre- Leave the interface; the power supply is connected to the cable line and the overhead line. The cable line includes 1-circuit true cable line and 2-circuit analog cable line to form the first busbar, and three groups of outdoor switch boxes are connected to the cable line; the overhead line includes 1-circuit true Type overhead lines and 2-circuit analog overhead lines form the second section of bus; 8 switch cabinets are set on the first section of the bus; 7 switch cabinets and 1 reserved cabinet are set on the second section of the bus; the neutral point grounding complete set Connect to the first busbar through a grounding transformer; the reserved interface is set on the cable line or overhead line to connect the test equipment. The invention can provide the field environment and fault current closest to the real distribution network for the primary and secondary integrated power distribution equipment, and obtain accurate detection results.

Description

A real mirror test platform for distribution network and detection method for primary and secondary integrated power distribution equipment

technical field

The invention relates to the technical field of power equipment detection, in particular to a real mirror test platform for a distribution network and a detection method for primary and secondary integrated power distribution equipment.

Background technique

With the rapid development of power distribution automation, primary and secondary integrated power distribution equipment has become an important part of the power distribution system. The complete set of power distribution equipment for primary and secondary fusion mainly includes a complete set of on-column switches for primary and secondary fusion, and a complete set of ring cages for primary and secondary fusion. There are three types: local mode, master station centralized type, and intelligent distributed type. The performance of the primary and secondary integrated power distribution equipment has a great impact on the reliability of the power supply of the distribution network, so it is of great significance to accurately detect its functions.

At present, the primary and secondary fusion complete sets of power distribution equipment function testing methods are mainly to build a test circuit in a laboratory environment or use the testing instruments on the market, boost 380V to 10kV through a step-up transformer, and use the boost control device to test the circuit. The simulated short-circuit fault current and ground fault current are formed in the system to detect the action of the primary and secondary integrated power distribution equipment. This test method has major limitations. First, the simulated ground fault current is very different from the fault current generated by the real distribution network fault. Second, the distribution network site environment, such as electromagnetic interference, is also different from laboratory. The environment is different; third, the parameters of its line and neutral point grounding device cannot completely replace the real distribution network equipment. These differences will affect the performance of the primary and secondary fusion power distribution equipment, and cannot achieve the ideal detection effect.

SUMMARY OF THE INVENTION

The purpose of the embodiment of the present invention is to provide a real mirror test platform for distribution network and a detection method for primary and secondary integrated power distribution equipment, and to provide a real network frame, lines, multiple neutral point grounding methods and various types of The distribution network reality test platform for ground faults and short-circuit faults can provide the most close to the real distribution network field environment and fault current for the primary and secondary integrated power distribution equipment, and obtain accurate detection results.

In order to achieve the above purpose, an embodiment of the present invention provides a real mirror test platform for a distribution network, including a power supply, a cable line, an overhead line, a switch cabinet, a complete set of neutral point grounding devices and a reserved interface; The cable line and the overhead line are connected, and the cable line includes a true cable line and an analog cable line with two circuits to form the first section of busbar, and three groups of outdoor switch boxes are connected to the cable line; The line includes 1 circuit of real overhead line and 2 circuits of simulated overhead line, forming the second section of busbar; 8 of the switch cabinets are set on the first section of busbar, which are 1 incoming cabinet and 1 voltage transformer cabinet respectively. and 6 outlet cabinets; 7 switch cabinets and 1 reserved cabinet are set on the second section of bus, and the 7 switch cabinets are respectively 1 inlet cabinet, 1 voltage transformer cabinet and 5 an outlet cabinet; the neutral point grounding complete set is connected to the first busbar through a grounding transformer; the reserved interface is arranged on the cable line or the overhead line for connecting test equipment.

Preferably, the neutral point grounding method of the complete set of neutral point grounding includes grounding through the arc suppression coil, grounding through a small resistance, grounding the arc suppression coil with a small resistance, and the neutral point is not grounded.

Preferably, the cable line can construct a single-radiation structure, a single-ring network structure, a 2-1 single-ring network structure, a 3-1 single-ring network structure, a 2-for-1 backup structure, and a double-ring network structure.

Another embodiment of the present invention provides a detection method for primary and secondary fusion power distribution equipment, the method is based on the distribution network real mirror test platform as described in any of the above, and includes short-circuit fault processing function detection, Single-phase ground fault handling function detection, local mode feeder automation strategy detection, main station centralized feeder automation strategy detection and intelligent distributed feeder automation strategy detection.

Preferably, the detection of the short-circuit fault processing function specifically includes:

Connect the primary and secondary fusion power distribution equipment to the reserved interface of the distribution network real mirror test platform, and generate phase-to-phase two-phase short-circuit faults and three-phase short-circuit faults through the short-circuit fault simulation unit of the primary and secondary fusion power distribution equipment. Phase short-circuit fault, the primary and secondary fusion power distribution equipment can correctly judge the fault type and act.

Preferably, the detection of the single-phase ground fault processing function specifically includes:

Connect the primary and secondary fusion power distribution equipment to the reserved interface of the distribution network real mirror test platform, and generate through the single-phase ground fault simulation unit and group switching unit of the primary and secondary fusion power distribution equipment. Metal ground fault, arc ground fault, ground fault through different resistance values and arc ground fault through transition resistance, the primary and secondary fusion power distribution equipment can correctly judge the fault type and act.

Preferably, the in-situ mode feeder automation strategy detection specifically includes:

The operation strategy of the primary and secondary fusion power distribution equipment is set to adaptive comprehensive type, voltage time type or voltage-current time type, and the primary and secondary fusion power distribution equipment is connected to the distribution network real mirror test platform For the reserved interface, the short-circuit fault and single-phase grounding fault are simulated at the preset first fault occurrence point, and the primary and secondary integrated power distribution equipment can operate correctly.

Preferably, the automatic strategy detection of the centralized feeder in the main station specifically includes:

The operation strategy of the primary and secondary fusion power distribution equipment is set as the main station centralized type, and the primary and secondary fusion power distribution equipment is connected to the reserved interface of the distribution network real mirror test platform. The second fault occurrence point simulates the occurrence of short-circuit fault and single-phase grounding fault. The primary and secondary fusion power distribution equipment can correctly detect the fault information and upload it to the distribution automation master station, and at the same time accept the instructions of the master station to perform correct actions .

Preferably, the intelligent distributed feeder automation strategy detection specifically includes:

Three of the reserved interfaces are set on the distribution network real mirror test platform, and an optical fiber peer-to-peer channel is established between each of the reserved interfaces;

Setting the operation strategies of the three primary and secondary integrated power distribution devices as intelligent distributed feeder automation strategies, and correspondingly connecting the three primary and secondary integrated power distribution devices to the reserved interface;

At the preset third fault occurrence point, a short-circuit fault and a single-phase ground fault are simulated, and the three primary and secondary integrated power distribution equipment can correctly detect the fault type and can communicate with each other and act correctly.

Compared with the prior art, the embodiment of the present invention provides a real mirror test platform for distribution network and a detection method for primary and secondary integrated power distribution equipment, which provides a real network frame, lines, and various neutral points. The grounding method and various types of grounding fault and short-circuit fault distribution network test platform can provide the most close to the real distribution network field environment and fault current for the primary and secondary integrated power distribution equipment, and obtain accurate detection results.

Description of drawings

Fig. 1 is the overall design framework schematic diagram of a kind of distribution network real mirror test platform provided by an embodiment of the present invention;

2 is a schematic diagram of a short-circuit fault simulation unit of a primary and secondary integrated power distribution equipment provided by an embodiment of the present invention;

3 is a schematic diagram of a single-phase-to-ground fault simulation unit of a primary and secondary integrated power distribution equipment provided by an embodiment of the present invention;

4 is a schematic diagram of a group switching unit of a primary and secondary integrated power distribution equipment provided by an embodiment of the present invention;

5 is a schematic diagram of an in-situ mode feeder automation strategy detection of a primary and secondary integrated power distribution equipment provided by an embodiment of the present invention;

6 is a schematic diagram of an automated strategy detection of a main station centralized feeder of a primary and secondary integrated power distribution equipment provided by an embodiment of the present invention;

FIG. 7 is a schematic diagram of an intelligent distributed feeder automation strategy detection of a primary and secondary integrated power distribution equipment according to an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Referring to FIG. 1, it is a schematic diagram of the overall design framework of a distribution network real mirror test platform provided by an embodiment of the present invention. The distribution network real mirror test platform includes a power supply, cable lines, overhead lines, switch cabinets, and neutral point grounding. A complete set of devices and reserved interfaces; wherein, the power supply is connected to the cable line and the overhead line, and the cable line includes a true-type cable line and an analog cable line with two circuits to form a first busbar, the There are three groups of outdoor switch boxes connected to the cable line; the overhead line includes a true type overhead line and a 2-circuit analog overhead line, forming a second section of the bus; the first section of the bus is provided with 8 of the switch cabinets, respectively There are 1 incoming cabinet, 1 voltage transformer cabinet and 6 outgoing cabinets; 7 switch cabinets and 1 reserved cabinet are set on the second section of the bus, and each of the 7 switch cabinets is 1 The incoming cabinet, one voltage transformer cabinet and five outgoing cabinets; the neutral point grounding device is connected to the first busbar through a grounding transformer; the reserved interface is set on the cable line or the On overhead lines, used to connect test equipment.

Specifically, the distribution network real mirror test platform includes power supply, cable lines, overhead lines, switch cabinets, neutral grounding complete sets and reserved interfaces; among them, the power supply consists of a 10kV dedicated line and an isolation transformer. The rated capacity is 2000kVA and the output voltage is 10kV. The power supply is connected with cable lines and overhead lines. In more detail, after the power supply passes through the isolation transformer, it is set to a single bus section mode. The cable line includes 1 circuit real cable circuit and 2 circuit analog cable circuits, which form the first busbar, also called the I busbar. There are three groups of outdoor switch boxes connected to the cable circuit. The overhead line includes 1 circuit of the real type of overhead circuit and 2 circuits of the simulated overhead circuit, forming the second section of the bus, also known as the second section of the bus. There are 8 switch cabinets on the first busbar, which are 1 incoming cabinet (G01 in Figure 1), 1 voltage transformer cabinet (also known as PT cabinet) and 6 outgoing cabinets (G02- in Figure 1) G07); 7 switch cabinets and 1 reserved cabinet are set on the second busbar, and the 7 switch cabinets are respectively 1 incoming cabinet (G08 in Figure 1), 1 voltage transformer cabinet and 5 outlet cabinets (G09-G013 in Figure 1). The switchgear is equipped with protection measurement and control devices, which have protection functions such as quick-break and over-current. The complete set of neutral point grounding device is connected to the first section of busbar through a grounding transformer. Preferably, the complete set of neutral point grounding device is connected to the outlet cabinet of the first section of busbar G06 through a grounding transformer. The reserved interface is set on the cable line or overhead line for connecting the test equipment. That is to say, the reserved interface can be set on each line of the distribution network real mirror test platform according to the test needs, including the real cable line, the simulated cable line, the real overhead line and the simulated overhead line. The distribution network reality test platform covers the main 10kV distribution network elements such as 10kV overhead lines, cable lines, column switches, and switch cabinets.

This embodiment of the present invention provides a real-world test platform for distribution network, which can simulate real grids, lines, various neutral point grounding methods, and various types of grounding faults and short-circuit faults, and can be a complete set of primary and secondary integration. The electrical equipment provides the field environment and fault current closest to the real distribution network, and obtains accurate detection results.

As an improvement of the above scheme, the neutral point grounding methods of the neutral point grounding complete set include grounding through the arc suppression coil, grounding through a small resistance, grounding of the arc suppression coil with a small resistance and the neutral point ungrounded.

Specifically, the neutral point grounding methods of the complete set of neutral point grounding include grounding through the arc suppression coil, grounding through a small resistance, grounding the arc suppression coil with a small resistance, and the neutral point is not grounded. The complete set of neutral point grounding device is used to lead out the neutral point of the system for grounding. As can be seen from Figure 1, the neutral grounding complete set is also provided with a backup branch to serve as a backup when other branches fail.

As an improvement of the above scheme, the cable line can construct a single radiation structure, a single ring network structure, a 2-1 single ring network structure, a 3-1 single ring network structure, a 2 for 1 backup structure and a double ring network structure.

Specifically, the cable line can construct a single-radiation structure, a single-ring network structure, a 2-1 single-ring network structure, a 3-1 single-ring network structure, a 2-for-1 backup structure, and a double-ring network structure. 3-1 single ring network structure refers to 3 loops and 1 group. Overhead lines can build single radiation structure, terminal contact structure, multi-section moderate contact structure, two supply and one standby structure and three supply and one standby structure. This shows that the line grid of the distribution network reality test platform can construct various circuit structures required for power testing, and has strong applicability.

This embodiment of the present invention provides a detection method for primary and secondary fusion power distribution equipment, the method is based on the distribution network real mirror test platform described in any of the above embodiments, and includes short-circuit fault processing function detection, single Phase-to-ground fault handling function detection, local mode feeder automation strategy detection, main station centralized feeder automation strategy detection and intelligent distributed feeder automation strategy detection.

Specifically, a detection method for primary and secondary integrated power distribution equipment is based on the distribution network real mirror test platform described in any of the above embodiments, including short-circuit fault processing function detection, single-phase ground fault processing function detection , Local mode feeder automation strategy detection, main station centralized feeder automation strategy detection and intelligent distributed feeder automation strategy detection. The primary and secondary integrated power distribution equipment has the processing function of short circuit fault and ground fault, and supports various feeder automation strategies. Therefore, short-circuit fault handling function detection, single-phase ground fault handling function detection, local mode feeder automation strategy detection, main station centralized feeder automation strategy detection and intelligent distributed feeder automation strategy detection are the functional detection of primary and secondary integrated power distribution equipment. basic content.

The general steps are: connect the primary and secondary integrated power distribution equipment to the distribution network real mirror test platform, select the grid form according to the test requirements, select the neutral point grounding method through the neutral point grounding complete set, simulate a fault, and observe the Whether the state changes and actions of primary and secondary integrated power distribution equipment comply with relevant regulations.

As an improvement of the above scheme, the detection of the short-circuit fault processing function specifically includes:

Connect the primary and secondary fusion power distribution equipment to the reserved interface of the distribution network real mirror test platform, and generate phase-to-phase two-phase short-circuit faults and three-phase short-circuit faults through the short-circuit fault simulation unit of the primary and secondary fusion power distribution equipment. Phase short-circuit fault, the primary and secondary fusion power distribution equipment can correctly judge the fault type and act.

Specifically, connect the primary and secondary integrated power distribution equipment to the reserved interface of the distribution network real mirror test platform, and generate two-phase short-circuit faults and three-phase short-circuit faults between phases through the short-circuit fault simulation unit of the primary and secondary integrated power distribution equipment. The secondary fusion power distribution equipment can correctly judge the fault type and act. For example, when the fault type is a circuit breaker switch, it can directly trip to remove the fault; when the fault type is a load switch device, it can support short-circuit fault events to be sent to the master station. Referring to FIG. 2 , it is a schematic diagram of a short-circuit fault simulation unit of a primary and secondary integrated power distribution equipment provided by this embodiment of the present invention. When simulating a fault, the short-circuit fault simulation unit simulates two-phase short-circuit faults and three-phase short-circuit faults between phases by controlling the A-phase switch, B-phase switch, and C-phase switch respectively. Among them, the interphase short-circuit fault current can reach a maximum of 1500A , the longest duration is 200ms; the size of the fault current can be adjusted by the phase-to-phase fault formed by different resistances, which is realized by the 35kV isolation knife switch (selecting different resistances).

As an improvement of the above solution, the detection of the single-phase ground fault processing function specifically includes:

Connect the primary and secondary fusion power distribution equipment to the reserved interface of the distribution network real mirror test platform, and generate through the single-phase ground fault simulation unit and group switching unit of the primary and secondary fusion power distribution equipment. Metal ground fault, arc ground fault, ground fault through different resistance values and arc ground fault through transition resistance, the primary and secondary fusion power distribution equipment can correctly judge the fault type and act.

Specifically, connect the primary and secondary integrated power distribution equipment to the reserved interface of the distribution network real mirror test platform, and generate metallic ground faults, Arc ground fault, ground fault through different resistance values and arc ground fault through transition resistance, the primary and secondary fusion power distribution equipment can correctly judge the fault type and act, that is, the primary and secondary fusion power distribution equipment can correctly judge the fault type, which can realize Handling of single-phase ground faults, support for fault events to be sent to the master station. Referring to FIG. 3 and FIG. 4 , it is a schematic diagram of a single-phase ground fault simulation unit and a group switching unit of a primary and secondary integrated power distribution equipment provided by this embodiment of the present invention, respectively. Among them, the group switching unit is also called the ground fault group switching unit with different resistance values. Different types of single-phase ground faults are simulated by switch switching, specifically: the metallic ground fault is achieved by switching the 12kV vacuum contactor in Figure 3; the arc ground fault is achieved by switching the arc flash in Figure 3. It is realized by grounding simulation device; the grounding fault through different resistance values is realized by grouping the switching unit of Figure 4, and its resistance range is 50-2000Ω; the arc grounding fault through transition resistance is combined with the single-phase switching of Figure 3. The ground fault simulation unit and the group switching unit of Fig. 4 are realized.

As an improvement of the above solution, the automatic strategy detection of the in-situ mode feeder specifically includes:

The operation strategy of the primary and secondary fusion power distribution equipment is set to adaptive comprehensive type, voltage time type or voltage-current time type, and the primary and secondary fusion power distribution equipment is connected to the distribution network real mirror test platform For the reserved interface, the short-circuit fault and single-phase grounding fault are simulated at the preset first fault occurrence point, and the primary and secondary integrated power distribution equipment can operate correctly.

Specifically, the operation strategy of the primary and secondary fusion power distribution equipment is set to adaptive comprehensive type, voltage time type or voltage-current time type, and the primary and secondary fusion power distribution equipment is connected to the reservation of the distribution network real mirror test platform. Interface, simulate the occurrence of short-circuit fault and single-phase ground fault at the preset first fault occurrence point, and the primary and secondary fusion power distribution equipment can operate correctly. Referring to FIG. 5 , it is a schematic diagram of a local mode feeder automation strategy detection of a primary and secondary integrated power distribution equipment provided by this embodiment of the present invention. Referring to the "Technical Principles of Local Feeder Automation", after building the circuit structure shown in Figure 5 in the distribution network real mirror test platform, connect the primary and secondary integrated power distribution equipment at the load switch 2, and the preset second A fault occurs on the line between load switch 2 and load switch 3. The fault types include short-circuit fault and single-phase ground fault. Detect the feeder automation logic of the primary and secondary integrated power distribution equipment, and the primary and secondary integrated power distribution equipment. The action conforms to the "Technical Principles of In-situ Feeder Automation".

As an improvement of the above solution, the centralized feeder automatic strategy detection of the main station specifically includes:

The operation strategy of the primary and secondary fusion power distribution equipment is set as the main station centralized type, and the primary and secondary fusion power distribution equipment is connected to the reserved interface of the distribution network real mirror test platform. The second fault occurrence point simulates the occurrence of short-circuit fault and single-phase grounding fault. The primary and secondary fusion power distribution equipment can correctly detect the fault information and upload it to the distribution automation master station, and at the same time accept the instructions of the master station to perform correct actions .

Specifically, the operation strategy of the primary and secondary fusion power distribution equipment is set as the main station centralized type, and the primary and secondary fusion power distribution equipment is connected to the reserved interface of the distribution network real mirror test platform. The fault occurrence point simulates the occurrence of short-circuit fault and single-phase ground fault. The primary and secondary integrated power distribution equipment can correctly detect the fault information and upload it to the main station of distribution automation, and at the same time accept the instructions of the main station to perform correct actions. Referring to FIG. 6 , it is a schematic diagram of automatic strategy detection of a main station centralized feeder of a primary and secondary integrated power distribution equipment provided by this embodiment of the present invention. Similarly, after building the circuit structure shown in Figure 6 in the distribution network real mirror test platform, connect the primary and secondary integrated power distribution equipment at the load switch 2, and the preset second fault occurrence point is set at the load switch On the line between 2 and load switch 3, the fault types include short-circuit fault and single-phase ground fault. The feeder automation logic of the primary and secondary fusion power distribution equipment is detected, and the primary and secondary fusion power distribution equipment can correctly detect the fault information and upload it to The power distribution automation master station accepts the master station's instructions to act correctly, determines the faulty section, isolates the fault point, and restores the power supply to the non-faulty section.

As an improvement of the above solution, the intelligent distributed feeder automatic strategy detection specifically includes:

Three of the reserved interfaces are set on the distribution network real mirror test platform, and an optical fiber peer-to-peer channel is established between each of the reserved interfaces;

Setting the operation strategies of the three primary and secondary integrated power distribution devices as intelligent distributed feeder automation strategies, and correspondingly connecting the three primary and secondary integrated power distribution devices to the reserved interface;

At the preset third fault occurrence point, a short-circuit fault and a single-phase ground fault are simulated, and the three primary and secondary integrated power distribution equipment can correctly detect the fault type and can communicate with each other and act correctly.

It should be noted that, for the local mode feeder automation strategy detection and the main station centralized feeder automation strategy detection, only one reserved interface needs to be reserved on the distribution network real mirror test platform, and the bypass switch can be used for switching. For intelligent distributed feeder automation strategy detection, because the communication and automation logic of the tested equipment is not common with existing equipment, if you need to detect the primary and secondary integrated power distribution equipment of a manufacturer, you need to reserve it on the distribution network real mirror test platform 3 reserved interfaces, and establish a fiber-optic peer-to-peer communication channel between each reserved interface, of which the slow-moving type can be realized through a wireless communication channel, and then connect to 3 primary and secondary fusion power distribution equipment of the manufacturer for detection .

Referring to FIG. 7 , it is a schematic diagram of an intelligent distributed feeder automation strategy detection of a primary and secondary integrated power distribution equipment provided by this embodiment of the present invention. The circuit structure shown in Figure 6 is built on the distribution network real mirror test platform, and three reserved interfaces are set, which are respectively at the load switch 1, load switch 2 and load switch 3 in Figure 7, and at the same time in each reserved interface. A fiber peer channel is established between the interfaces.

Set the operation strategy of the three primary and secondary fusion power distribution equipment to the intelligent distributed feeder automation strategy, and connect the three primary and secondary fusion power distribution equipment to the reserved interface correspondingly, that is, one primary and secondary fusion power distribution equipment. Access a reserved interface.

The preset third fault occurrence point is set on the line between load switch 2 and load switch 3. Different types of short-circuit faults and single-phase grounding faults are simulated at the preset third fault occurrence point to detect the failure of the equipment under test. Feeder automation logic. The three primary and secondary integrated power distribution equipment can correctly detect the fault type, communicate with each other and operate correctly, and can identify the faulty section, isolate the fault point through switching action, and restore the power supply of the non-faulty section.

To sum up, the embodiment of the present invention provides a real mirror test platform for a distribution network and a detection method for primary and secondary integrated power distribution equipment, and provides a real network frame, lines, multiple neutral point grounding methods and various Type ground fault, short-circuit fault distribution network reality test platform, the distribution network reality test platform is built in the real distribution network environment, the physical environment and electromagnetic environment are consistent with the real distribution network environment; the simulated short-circuit fault and Single-phase grounding faults are all generated on real 10kV distribution network lines, and their short-circuit current characteristics are closest to the real situation, which is more accurate than the simulated currents used in laboratories or other testing equipment; the line and neutral grounding devices used All kinds of distribution network equipment such as switches and transformers are real distribution network equipment, and their parameters can replace typical distribution network equipment to achieve higher detection accuracy; it can provide the closest real distribution network for primary and secondary integrated power distribution equipment. On-site environment and fault current, get accurate detection results.

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

Claims (9)

1. A distribution network real mirror test platform is characterized by comprising a power supply, a cable line, an overhead line, a switch cabinet, a neutral point grounding complete set of devices and a reserved interface; the power supply is connected with the cable line and the overhead line, the cable line comprises 1-loop real cable line and 2-loop simulation cable line to form a first section of bus, and three groups of outdoor switch boxes are connected on the cable line; the overhead line comprises 1-loop real overhead line and 2-loop simulation overhead line to form a second section of bus; 8 switch cabinets, namely 1 incoming line cabinet, 1 voltage transformer cabinet and 6 outgoing line cabinets, are arranged on the first section of bus; 7 switch cabinets and 1 reserved cabinet are arranged on the second section of bus bar, and the 7 switch cabinets are respectively 1 incoming line cabinet, 1 voltage transformer cabinet and 5 outgoing line cabinets; the neutral point grounding complete set device is connected with the first section of bus through a grounding transformer; the reserved interface is arranged on the cable line or the overhead line and used for connecting test equipment.

2. The distribution network real mirror test platform of claim 1, wherein the neutral grounding mode of the neutral grounding complete set of devices comprises grounding through an arc suppression coil, grounding through a small resistor, grounding through the arc suppression coil and the small resistor and non-grounding the neutral point.

3. The distribution network real mirror test platform as claimed in claim 1, wherein the cable line can construct a single radiation structure, a single ring network structure, a 2-1 single ring network structure, a 3-1 single ring network structure, a 2 supply 1 device structure and a double ring network structure.

4. A detection method of primary and secondary fusion power distribution equipment is carried out based on the distribution network real mirror test platform of any one of claims 1 to 3, and comprises short-circuit fault processing function detection, single-phase earth fault processing function detection, local mode feeder automation strategy detection, main station centralized feeder automation strategy detection and intelligent distributed feeder automation strategy detection.

5. The method for detecting the primary and secondary fusion power distribution equipment according to claim 4, wherein the short-circuit fault processing function detection specifically comprises:

and the primary and secondary fusion power distribution equipment is connected to the reserved interface of the real-time distribution network mirror test platform, and the two-phase short-circuit fault and the three-phase short-circuit fault are generated by the short-circuit fault simulation unit of the primary and secondary fusion power distribution equipment, so that the fault type can be correctly judged and the action can be carried out by the primary and secondary fusion power distribution equipment.

6. The method for detecting the primary and secondary fusion power distribution equipment according to claim 4, wherein the single-phase ground fault handling function detection specifically comprises:

and the primary and secondary fusion power distribution equipment is connected to the reserved interface of the distribution network real mirror test platform, and a metallic ground fault, an arc grounding fault, a grounding fault with different resistance values and an arc grounding fault through a transition resistor are generated through a single-phase ground fault simulation unit and a grouping switching unit of the primary and secondary fusion power distribution equipment, so that the primary and secondary fusion power distribution equipment can correctly judge the fault type and act.

7. The method according to claim 4, wherein the in-situ mode feeder automation policy detection comprises:

setting the operation strategy of the primary and secondary fusion power distribution equipment into a self-adaptive comprehensive type, a voltage time type or a voltage-current time type, connecting the primary and secondary fusion power distribution equipment into the reserved interface of the distribution network real mirror test platform, simulating short-circuit fault and single-phase earth fault at a preset first fault occurrence point, and enabling the primary and secondary fusion power distribution equipment to act correctly.

8. The method for detecting the primary and secondary fusion power distribution equipment according to claim 4, wherein the primary station centralized feeder automation policy detection specifically comprises:

the operation strategy of the primary and secondary fusion power distribution equipment is set to be a main station centralized type, the primary and secondary fusion power distribution equipment is connected into the distribution network real mirror test platform, the reserved interface simulates a short-circuit fault and a single-phase earth fault at a preset second fault occurrence point, the primary and secondary fusion power distribution equipment can correctly detect fault information and upload the fault information to a power distribution automation main station, and meanwhile, the command of the main station is received to perform correct action.

9. The method for detecting the primary and secondary converged power distribution equipment according to claim 4, wherein the intelligent distributed feeder automation policy detection specifically comprises:

setting three reserved interfaces on the distribution network real-time mirror test platform, and establishing an optical fiber peer-to-peer channel between each reserved interface;

setting operation strategies of the three primary and secondary fusion power distribution equipment as intelligent distributed feeder automation strategies, and correspondingly accessing the three primary and secondary fusion power distribution equipment to the reserved interfaces;

and simulating the occurrence of short-circuit fault and single-phase earth fault at a preset third fault occurrence point, wherein the three primary and secondary fusion power distribution equipment can correctly detect the fault type and can mutually communicate and correctly act.

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