CN112816832A - Power distribution network broken line grounding test device and test method - Google Patents
Power distribution network broken line grounding test device and test method Download PDFInfo
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- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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Abstract
The invention provides a power distribution network disconnection and grounding test device, which comprises a disconnection simulation unit, a grounding simulation unit and a secondary measurement and control unit; one end of the disconnection simulating unit is connected with a three-phase line of the power distribution network, and the other end of the disconnection simulating unit is connected with the grounding simulating unit through a built-in first circuit breaker group; the disconnection simulating unit and the grounding simulating unit are connected with the secondary measurement and control unit; a second breaker group is arranged in the grounding simulation unit; remote control devices are arranged in the first breaker group and the second breaker group, and when the test is carried out, the opening and closing states of the first breaker group and the second breaker group can be controlled through the remote control devices, so that the first breaker group and the second breaker group are matched in time sequence; the invention can be used for the function simulation of the disconnection and the grounding fault of the power distribution network, and comprehensively verifies the new technology of disconnection research and judgment and the function and the performance of new equipment.
Description
Technical Field
The invention relates to the technical field of power distribution equipment, in particular to a power distribution network disconnection and grounding test device.
Background
With the aggravation of the urbanization process in China, the grid structure of the power distribution network is larger and larger, the area covered by the grid structure is more and more complex, and distribution network lines often suffer from single-phase line breakage, two-line breakage and even three-phase line breakage caused by lightning stroke, ground blasting, mechanical excavation, installation process, electrical quality and the like. After a power distribution network line is disconnected, because no obvious overcurrent exists, the fault cannot be immediately removed, the fault identification and section positioning difficulty is high, a side connecting place after the disconnection exists for a long time, personal electric shock accidents can be caused, and meanwhile, the problem that electrical equipment is damaged due to asymmetric voltage is solved.
Because the fault phenomenon caused by broken line is more, there are various forms such as single-phase broken line ungrounded, single-phase broken line power supply side grounded, single-phase broken line load side grounded, single-phase broken line power supply side and load side grounded simultaneously, any two broken lines are ungrounded, any two different sides are grounded respectively, any two same sides are grounded to cause interphase short circuit, three-phase broken line, etc., and simultaneously because the broken line fault characteristic is not obvious, the new technology and new equipment for broken line research and judgment in the power distribution network put forward higher requirements, so the new technology and new equipment need to be subjected to functional tests to verify the functional effects of the broken line and ground fault research and judgment.
The existing method for simulating the disconnection fault is to modify a three-phase section switch put into operation on a line and then utilize a section switch to open a brake so as to simulate the disconnection phenomenon. When a single-phase disconnection is to be tested, firstly, two ends of the other two phases of slave switches are short-circuited by adopting a high-voltage cable, and then the switches are switched off by using a remote control or local operation method; when two phases are to be tested for disconnection, the other phase is short-circuited by adopting a high-voltage cable, and then the switch is switched off by utilizing remote control or a local method. The method has a plurality of disadvantages, firstly, the existing line switch is required to be modified, different modification measures are required according to different types of line breaking faults, and during modification, power failure operation is carried out, or live working personnel need to be matched at any time, so that the resource demand is large, and the satisfaction degree of a power receiving user is influenced if power failure occurs; secondly, a line breaking fault is simulated by adopting a sectional switch for remote control or local brake opening, the operation is manual, the line breaking time cannot be accurately controlled, and the line breaking fault research and judgment technology and equipment cannot be comprehensively tested; thirdly, an independent single-phase grounding device is needed to simulate the grounding phenomenon after disconnection, and the single-phase grounding device is needed to be matched with disconnection operation simulated by the section switch opening action in time, so that more abnormal scenes cannot be accurately simulated.
With the increasing scale of urban power distribution networks, the faced environment is more and more complex, the conditions of line breaking faults are more and more, the equipment for line breaking and ground faults in operation is more and more abundant, and the effect verification of the functions of line breaking judgment, alarm, protection, analysis and the like is required.
Disclosure of Invention
The invention provides a power distribution network disconnection and grounding test device which can be used for power distribution network disconnection and grounding fault function simulation and comprehensively verifying the new technology of disconnection research and judgment and the function and performance of new equipment.
In order to achieve the purpose, the invention adopts the following technical scheme: a power distribution network disconnection and grounding test device comprises a disconnection simulation unit, a grounding simulation unit and a secondary measurement and control unit; one end of the disconnection simulating unit is connected with a three-phase line of the power distribution network, and the other end of the disconnection simulating unit is connected with the grounding simulating unit through a built-in first circuit breaker group; the disconnection simulating unit and the grounding simulating unit are connected with the secondary measurement and control unit; a second breaker group is arranged in the grounding simulation unit; and remote control devices are arranged in the first breaker group and the second breaker group, and are used for controlling the opening and closing states of the breaker groups.
Further, the first breaker group comprises a single-phase vacuum breaker K1, a single-phase vacuum breaker K2 and a single-phase vacuum breaker K3; the second circuit breaker group comprises a single-phase vacuum circuit breaker Q; the broken line simulation unit comprises a mechanical isolation switch G1 with a visible disconnection point, a mechanical isolation switch G2 and a mechanical isolation switch G3; the upper ends of the three mechanical isolation disconnecting switches are connected with a three-phase line of the power distribution network through flexible cables provided with electrified clamps, the lower ends of the three mechanical isolation disconnecting switches are connected with a high-voltage pile head of the disconnection simulating unit through a detachable copper nose, and the high-voltage pile head is connected with a first circuit breaker group through a copper plate; and the single-phase vacuum circuit breaker K1 in the first circuit breaker group is connected with the grounding simulation unit through a three-position switch.
Further, the mechanical isolation disconnecting link is a manual disconnecting link; the three-position switch is used for selecting whether the grounding mode after the single-phase disconnection is power supply side grounding or load side grounding; the three-position switch can be connected to the upper end position or the lower end position of the first breaker group; when the three-position switch is connected to the upper end position of the first breaker group, the test device simulates the power supply side to be grounded; when the three-position switch is connected to the lower end position of the first breaker group, the test device simulates the load side to be grounded;
the flexible cables provided with the electrified clamp are in three pairs and are respectively marked by yellow, green and red, one end of each flexible cable is hung to two sides of a three-phase section switch on the overhead line of the power distribution network, and the other end of each flexible cable is connected to a high-voltage pile head of the test device before hanging.
Further, the high-voltage pile heads are arranged in two groups, wherein one group comprises a high-voltage pile head A1, a high-voltage pile head B1 and a high-voltage pile head C1 corresponding to a three-phase line, and the other group comprises a high-voltage pile head A2, a high-voltage pile head B2 and a high-voltage pile head C2 corresponding to a three-phase line; the high-voltage pile heads in each group are distinguished by yellow, green and red and are consistent with the color marks of the three-phase lines of the power distribution network.
Further, the grounding module unit comprises a single-phase vacuum circuit breaker Q, an adjustable grounding resistance module, an arc discharge module and a contactor for selecting a bypass adjustable grounding resistance module or an arc discharge module; when the single-phase vacuum circuit breaker Q is in a closing state, the grounding module unit simulates a grounding state after disconnection.
Furthermore, an outgoing line copper plate of the single-phase vacuum circuit breaker Q is connected with an adjustable resistance module, and the adjustable grounding resistance module can be used for setting a resistance value according to test requirements to simulate small-resistance grounding or high-resistance grounding; the adjustable resistance module is connected with the bypass contactor P1 in parallel, and when the bypass contactor P1 is in a closing state, the adjustable grounding resistance module simulates metallic grounding.
Further, the arc discharge module comprises a silicon controlled rectifier for controlling the on-state and the off-state of the arc discharge working condition of the arc discharge module, and the silicon controlled rectifier is used for setting the conduction angle, the conduction time, the stop time and the cycle number of the arc discharge working condition.
Furthermore, the arc discharge module is connected with an outgoing copper plate of the adjustable resistance module in an incoming manner; the arc discharge module is connected in parallel with the bypass contactor P2, and when arc discharge is not needed in the test, the arc discharge module can close the bypass contactor P2.
Furthermore, the secondary measurement and control unit comprises a measurement module, a protection module and a control module;
the measuring module comprises a mutual inductor which is used for measuring analog quantities in the disconnection analog unit and the grounding analog unit and collecting signal quantities;
the protection module is used for carrying out microcomputer comprehensive protection on the test device;
the control module can control the time sequence matching between the disconnection simulating unit and the grounding simulating unit, can set the resistance value of the adjustable grounding resistance module and can set the parameters of the arc discharge module.
A test method of a power distribution network disconnection grounding test device comprises the following steps:
1) installing and fixing a high-voltage flexible cable to a high-voltage pile head of the disconnection simulating unit; connecting the grounding end of the grounding simulation unit to the ground through a working grounding wire, and protecting and grounding the whole shell of the broken wire grounding test device;
2) manually switching on mechanical isolation disconnecting switches G1, G2 and G3 of a disconnection simulation unit, remotely switching on single-phase vacuum circuit breakers K1, K2 and K3, manually setting the upper ends or the lower ends of three-position switches F to K1 according to test requirements, and simulating the grounding of a power supply side or conforming to the grounding of the power supply side;
3) hanging the flexible cable which is installed and fixed on the high-voltage pile head at one end in the step 1) to the power side and the load side of the three-phase section switch of the three-phase line of the power distribution network according to the incoming and outgoing lines and the phase difference, and ensuring stable hanging and correct phase difference;
4) remotely controlling or locally operating three-phase section switches on a three-phase line of the power distribution network to be in an opening state;
5) configuring parameters such as switching-off time of a single-phase short-circuit device K1, switching-on time of a single-phase circuit breaker Q, sequential logic and the like according to test requirements;
6) remotely controlling the single-phase breaker K1 to open the brake and the single-phase breaker Q to close the brake, automatically recovering the closing state of the breaker K1 after the time of parameter configuration, and automatically recovering the opening state of the single-phase breaker Q;
7) extracting test data and wave recording waveforms to analyze test results;
8) and setting relevant switch states according to the next group of test working conditions, and preparing to perform the next group of tests.
Furthermore, the vacuum circuit breaker of the remote control opening and disconnection simulation unit can realize disconnection simulation, the opening time of the circuit breaker can be set through parameters, the accuracy can be achieved to millisecond, the disconnection time required by the accurate realization test is long, and enough accurate test data are provided for the test.
Furthermore, grounding after disconnection requires grounding of a power supply side or grounding of a load side or no grounding, manual selection can be performed through a three-position switch, and adjustment can be performed at any time.
Furthermore, the grounding after the disconnection can be matched with the disconnection in a time sequence, and the grounding time after the disconnection is set according to the test requirement.
Furthermore, the size of the grounding resistor can be adjusted according to the test requirements, and different grounding scenes such as metallic grounding, low-resistance grounding, high-resistance grounding and the like can be conveniently simulated.
Further, whether the arc grounding is performed or not can be selected, and the arc grounding can control a conduction angle, conduction duration, stop duration, cycle number and the like.
Compared with the prior art, the invention has the advantages that: the test device does not need to reform the three-phase section switch which is put into operation on the line when the disconnection test is carried out, only three pairs of flexible cables need to be hung to two sides of the three-phase section switch on the overhead line of the power distribution network through the electrified clamp respectively, and the other ends of the flexible cables are connected to a high-voltage pile head of the test device before hanging. Therefore, only one-time wiring is needed, namely, the existing switch is not required to be transformed, the live working resources are not required to be additionally consumed, the power failure of the line is not required, and the preparation work before the test is simple, convenient, rapid and safe.
Drawings
FIG. 1 is a schematic diagram of the structural principle of the present invention;
in the figure: 1-three-phase section switch; 2-a disconnection simulating unit; 3-a secondary measurement and control unit; 4-a ground analog unit; 5-a measurement module; 6-a protection module; 7-a control module; 8-an adjustable grounding resistance module; 9-arc discharge module.
Detailed Description
The invention is described in further detail below with reference to the following figures and detailed description:
as shown in the figure, the test device for the disconnection and grounding of the power distribution network comprises a disconnection simulation unit 2, a grounding simulation unit 4 and a secondary measurement and control unit 3; one end of the disconnection simulating unit is connected with a three-phase line of the power distribution network, and the other end of the disconnection simulating unit is connected with the grounding simulating unit through a built-in first circuit breaker group; the disconnection simulating unit and the grounding simulating unit are connected with the secondary measurement and control unit; a second breaker group is arranged in the grounding simulation unit; the first circuit breaker group and the second circuit breaker group are both internally provided with remote control devices, and when the test is carried out, the opening and closing states of the first circuit breaker group and the second circuit breaker group can be controlled through the remote control devices, so that the first circuit breaker group and the second circuit breaker group are matched in time sequence.
Preferably, the first circuit breaker group comprises a single-phase vacuum circuit breaker K1, a single-phase vacuum circuit breaker K2 and a single-phase vacuum circuit breaker K3; the second circuit breaker group comprises a single-phase vacuum circuit breaker Q; the broken line simulation unit comprises three mechanical isolation switches G1, G2 and G3 with visible disconnection points; the upper end of the mechanical isolation disconnecting link is connected with a three-phase line of the power distribution network through a flexible cable provided with a charged clamp, the lower end of the mechanical isolation disconnecting link is connected with a high-voltage pile head of the disconnection simulation unit through a detachable copper nose, and the high-voltage pile head is connected with a first circuit breaker group through a copper plate; and the single-phase vacuum circuit breaker K1 in the first circuit breaker group is connected with the grounding simulation unit through a three-position switch.
Preferably, the mechanical isolation switch is a manually operated switch; the three-position switch is used for selecting whether the grounding mode after the single-phase disconnection is power supply side grounding or load side grounding;
preferably, the three-position switch can be connected to the upper end position or the lower end position of the first breaker group when testing; when the three-position switch is connected to the upper end position of the first breaker group, the test device simulates the power supply side to be grounded; when the three-position switch is connected to the lower end position of the first breaker group, the test device simulates the load side to be grounded;
preferably, during the test, the flexible cables provided with the electrified clamp are in three pairs and respectively marked by yellow, green and red, one end of each flexible cable is hung to two sides of a three-phase section switch on the overhead line of the power distribution network, and the other end of each flexible cable is connected to a high-voltage pile head of the test device before being hung;
preferably, the high-voltage pile heads are arranged in two groups, wherein one group comprises a high-voltage pile head A1, a high-voltage pile head B1 and a high-voltage pile head C1 corresponding to a three-phase line, and the other group comprises a high-voltage pile head A2, a high-voltage pile head B2 and a high-voltage pile head C2 corresponding to a three-phase line; the high-voltage pile heads in each group are distinguished by yellow, green and red and are consistent with the color identification of the three-phase line of the power distribution network, so that the interphase short circuit accident caused by wrong connection in the test process is prevented.
Preferably, the grounding module unit comprises a single-phase vacuum circuit breaker Q, an adjustable grounding resistance module 8, an arc discharge module 9, and a contactor for selectively bypassing the adjustable grounding resistance module or the arc discharge module;
preferably, when the single-phase vacuum circuit breaker Q is in a closed state, the grounding module unit simulates a grounding state after disconnection.
Preferably, the outgoing line copper plate of the single-phase vacuum circuit breaker Q is connected with an adjustable resistance module, and the adjustable grounding resistance module can set a resistance value according to test requirements to simulate small-resistance grounding or high-resistance grounding; the adjustable resistance module is connected with the bypass contactor P1 in parallel, and when the bypass contactor P1 is in a closing state, the adjustable grounding resistance module simulates metallic grounding.
Preferably, the arc discharge module comprises a thyristor capable of controlling the on-state and the off-state of the arc discharge working condition, and the thyristor can set the conduction angle, the conduction duration, the stop duration and the cycle number of the arc discharge working condition.
Preferably, the arc discharge module is connected with an adjustable resistance module outgoing copper plate in an incoming line manner; the arc discharge module is connected in parallel with the bypass contactor P2, and when arc discharge is not needed in the test, the arc discharge module can close the bypass contactor P2.
Preferably, the secondary measurement and control unit comprises a measurement module 5, a protection module 6 and a control module 7;
preferably, the measuring module comprises a mutual inductor for measuring analog quantities in the disconnection analog unit and the grounding analog unit and collecting signal quantities;
preferably, the protection module is used for carrying out microcomputer comprehensive protection on the test device;
preferably, the control module can control the time sequence matching between the disconnection simulating unit and the grounding simulating unit, can set the resistance value of the adjustable grounding resistance module, and can set the parameters of the arc discharge module.
Preferably, the first breaker group and the second breaker group simulate disconnection by remote control opening, and the opening time is set by parameters and is accurate to millisecond.
Preferably, the connection parts of the disconnection simulating unit and the three-phase line of the power distribution network are respectively positioned on the incoming line side and the outgoing line side of the three-phase section switch 1 of the power distribution network.
Example 1:
in this example, the testing device includes a disconnection simulating unit, a grounding simulating unit and a secondary measurement and control unit. The upper end of the disconnection simulating unit is fixedly provided with two groups of three-phase high-voltage pile heads A1, B1, C1, A2, B2 and C2, the high-voltage pile heads are distinguished by yellow, green and red, and flexible cables which are hung to three phases of an overhead line are also marked by yellow, green and red to prevent interphase short circuit caused by hanging and connecting wrong wires. The high-voltage pile head is connected to three mechanical isolation disconnecting switches G1, G2 and G3 inside the disconnection simulation unit through a copper plate, and the mechanical isolation disconnecting switches are manually operated and have obvious visible disconnection points for an operator to observe the position of the disconnecting switches and provide safety guarantee for the operator. The lower end of the mechanical isolation disconnecting link is connected to three single-phase vacuum circuit breakers K1, K2 and K3 through copper plates respectively, the single-phase vacuum circuit breakers are provided with remote control devices, and remote control opening and closing are carried out through remote controllers. And F is a three-position switch, and two contacts are respectively connected to the upper end and the lower end of the single-phase vacuum circuit breaker K1 through copper plates and used for selecting whether the grounding is the power supply side grounding or the load side grounding after the single-phase disconnection. The three-position switches are arranged at the upper end and the lower end of the K1 single-phase vacuum circuit breaker to simulate grounding after disconnection of the phase A, which is a preferred embodiment of the scheme, and it should be noted that the three-position switches are also arranged at the upper and lower sections of the K2 and K3 vacuum circuit breakers, so that grounding after disconnection of the corresponding phase can be realized, and any two-phase grounding after disconnection and three-phase grounding after disconnection can be realized by operating a plurality of groups of three-position switches, and the improvement is also regarded as the protection range of the invention because of the same principle.
The grounding simulation unit comprises a single-phase vacuum circuit breaker, an adjustable grounding resistance module, an arc discharge module and a contactor for bypassing the adjustable grounding resistance module and the arc discharge module. The switching-on single-phase vacuum circuit breaker Q can realize the grounding simulation after the disconnection, is connected with a three-station switch F outgoing line copper plate of the disconnection simulation unit, is also provided with a remote controller, and is simultaneously matched with a single-phase vacuum circuit breaker K1 in a time sequence through a program for simulating the grounding scene after the disconnection. The single-phase vacuum circuit breaker Q is qualified for the next round of competitions copper tablet and is connected adjustable resistance module, and adjustable resistance module can set up its resistance value according to the experimental demand, simulates little resistance ground connection and high resistance ground connection respectively. The adjustable resistance module is connected with a bypass contactor P1 in parallel, and metallic grounding can be realized by closing P1. The arc discharge module is connected with the adjustable resistance module outgoing copper plate through incoming wires, the arc discharge module conducts and shuts off arc discharge through the silicon controlled rectifier, and a conduction angle, discharge duration, stop duration, cycle times and the like can be set. The arc discharge module is connected with the bypass contactor P2 in parallel, and when the test project does not need arc discharge, the bypass contactor P2 is closed.
The secondary measurement and control unit comprises a measurement module, a protection module and a control module. The measuring module is used for extracting and storing analog signals of the mutual inductors arranged in the broken line analog unit and the grounding analog unit and used for data information of fault phenomenon analysis; the measuring module can acquire semaphore data and feed back the semaphore data to the control module. The control module is mainly responsible for the time sequence matching of the single-phase vacuum circuit breaker of the disconnection simulating unit and the grounding circuit breaker of the grounding simulating unit, the resistance value setting of the adjustable resistor and the parameter setting of the arc discharge device. The protection module carries out microcomputer comprehensive protection on the system.
Example 2:
a method of performing a wire break test with the apparatus of example 1 comprising the steps of:
firstly, correspondingly fixing three groups of flexible cables on a high-voltage pile head of a disconnection simulating unit, and setting parameters such as opening time of a disconnection vacuum circuit breaker K1, matching time of K1 and Q time sequence and the like according to test requirements;
step two, the live working class respectively connects the three groups of flexible cables to the incoming line side and the outgoing line side of the overhead line three-phase section switch in a live mode;
step three, manually switching on mechanical isolation disconnecting links G1, G2 and G3, and remotely switching on single-phase vacuum circuit breakers K1, K2 and K3;
step four, the three-phase section switch on the brake separating line is remotely controlled or operated on site;
placing a proper contact on the three-station switch F according to the test requirement;
step six, adjusting the resistance value of the adjustable resistance module or closing a bypass contactor P1 according to the test requirement;
step seven, setting relevant parameters of the arc discharge module or closing a bypass contactor P2 according to test requirements;
eighthly, switching off operation is carried out through a remote controller of the single-phase vacuum circuit breaker K1, real single-phase disconnection is simulated, corresponding switching-on of the grounding vacuum circuit breaker Q is carried out according to the parameter setting in the step one, and real single-phase grounding is simulated;
the above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.
Claims (10)
1. A power distribution network disconnection and grounding test device is characterized by comprising a disconnection simulation unit, a grounding simulation unit and a secondary measurement and control unit; one end of the disconnection simulating unit is connected with a three-phase line of the power distribution network, and the other end of the disconnection simulating unit is connected with the grounding simulating unit through a built-in first circuit breaker group; the disconnection simulating unit and the grounding simulating unit are connected with the secondary measurement and control unit; a second breaker group is arranged in the grounding simulation unit; and remote control devices are arranged in the first breaker group and the second breaker group, and are used for controlling the opening and closing states of the breaker groups.
2. The power distribution network disconnection and grounding test device according to claim 1, wherein: the first breaker group comprises a single-phase vacuum breaker K1, a single-phase vacuum breaker K2 and a single-phase vacuum breaker K3; the second circuit breaker group comprises a single-phase vacuum circuit breaker Q; the broken line simulation unit comprises a mechanical isolation switch G1 with a visible disconnection point, a mechanical isolation switch G2 and a mechanical isolation switch G3; the upper ends of the three mechanical isolation disconnecting switches are connected with a three-phase line of the power distribution network through flexible cables provided with electrified clamps, the lower ends of the three mechanical isolation disconnecting switches are connected with a high-voltage pile head of the disconnection simulating unit through a detachable copper nose, and the high-voltage pile head is connected with a first circuit breaker group through a copper plate; and the single-phase vacuum circuit breaker K1 in the first circuit breaker group is connected with the grounding simulation unit through a three-position switch.
3. The power distribution network disconnection and grounding test device according to claim 2, wherein: the mechanical isolation disconnecting link is a manual disconnecting link; the three-position switch is used for selecting whether the grounding mode after the single-phase disconnection is power supply side grounding or load side grounding; the three-position switch can be connected to the upper end position or the lower end position of the first breaker group; when the three-position switch is connected to the upper end position of the first breaker group, the test device simulates the power supply side to be grounded; when the three-position switch is connected to the lower end position of the first breaker group, the test device simulates the load side to be grounded;
the flexible cables provided with the electrified clamp are in three pairs and are respectively marked by yellow, green and red, one end of each flexible cable is hung to two sides of a three-phase section switch on the overhead line of the power distribution network, and the other end of each flexible cable is connected to a high-voltage pile head of the test device before hanging.
4. The power distribution network disconnection and grounding test device according to claim 2, wherein: the high-voltage pile heads are arranged in two groups, wherein one group comprises a high-voltage pile head A1, a high-voltage pile head B1 and a high-voltage pile head C1 which correspond to three-phase lines, and the other group comprises a high-voltage pile head A2, a high-voltage pile head B2 and a high-voltage pile head C2 which correspond to the three-phase lines; the high-voltage pile heads in each group are distinguished by yellow, green and red and are consistent with the color marks of the three-phase lines of the power distribution network.
5. The power distribution network disconnection and grounding test device according to claim 1, wherein: the grounding module unit comprises a single-phase vacuum circuit breaker Q, an adjustable grounding resistance module, an arc discharge module and a contactor for selecting a bypass adjustable grounding resistance module or an arc discharge module; when the single-phase vacuum circuit breaker Q is in a closing state, the grounding module unit simulates a grounding state after disconnection.
6. The power distribution network disconnection and grounding test device according to claim 5, wherein: the outgoing line copper plate of the single-phase vacuum circuit breaker Q is connected with an adjustable resistance module, and the adjustable grounding resistance module can set a resistance value according to test requirements to simulate small-resistance grounding or high-resistance grounding; the adjustable resistance module is connected with the bypass contactor P1 in parallel, and when the bypass contactor P1 is in a closing state, the adjustable grounding resistance module simulates metallic grounding.
7. The power distribution network disconnection and grounding test device according to claim 5, wherein: the arc discharge module comprises a silicon controlled rectifier for controlling the on-state and off-state of the arc discharge working condition of the arc discharge module, and the silicon controlled rectifier is used for setting the conduction angle, the on-time, the stop-time and the cycle number of the arc discharge working condition.
8. The power distribution network disconnection and grounding test device according to claim 5, wherein: the arc discharge module is connected with the adjustable resistance module outgoing line copper plate in an incoming line manner; the arc discharge module is connected in parallel with the bypass contactor P2, and when arc discharge is not needed in the test, the arc discharge module can close the bypass contactor P2.
9. The power distribution network disconnection and grounding test device according to claim 6, wherein: the secondary measurement and control unit comprises a measurement module, a protection module and a control module;
the measuring module comprises a mutual inductor which is used for measuring analog quantities in the disconnection analog unit and the grounding analog unit and collecting signal quantities;
the protection module is used for carrying out microcomputer comprehensive protection on the test device;
the control module can control the time sequence matching between the disconnection simulating unit and the grounding simulating unit, can set the resistance value of the adjustable grounding resistance module and can set the parameters of the arc discharge module.
10. The test method of the power distribution network disconnection and grounding test device according to any one of claims 1 to 9, characterized by comprising the following steps:
1) installing and fixing a high-voltage flexible cable to a high-voltage pile head of the disconnection simulating unit; connecting the grounding end of the grounding simulation unit to the ground through a working grounding wire, and protecting and grounding the whole shell of the broken wire grounding test device;
2) manually switching on mechanical isolation disconnecting switches G1, G2 and G3 of a disconnection simulation unit, remotely switching on single-phase vacuum circuit breakers K1, K2 and K3, manually setting the upper ends or the lower ends of three-position switches F to K1 according to test requirements, and simulating the grounding of a power supply side or conforming to the grounding of the power supply side;
3) hanging the flexible cable which is installed and fixed on the high-voltage pile head at one end in the step 1) to the power side and the load side of the three-phase section switch of the three-phase line of the power distribution network according to the incoming and outgoing lines and the phase difference, and ensuring stable hanging and correct phase difference;
4) remotely controlling or locally operating three-phase section switches on a three-phase line of the power distribution network to be in an opening state;
5) configuring parameters such as switching-off time of a single-phase short-circuit device K1, switching-on time of a single-phase circuit breaker Q, sequential logic and the like according to test requirements;
6) remotely controlling the single-phase breaker K1 to open the brake and the single-phase breaker Q to close the brake, automatically recovering the closing state of the breaker K1 after the time of parameter configuration, and automatically recovering the opening state of the single-phase breaker Q;
7) extracting test data and wave recording waveforms to analyze test results;
8) and setting relevant switch states according to the next group of test working conditions, and preparing to perform the next group of tests.
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