CN113466632A - Uninterrupted direct current grounding search system and method - Google Patents
Uninterrupted direct current grounding search system and method Download PDFInfo
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- CN113466632A CN113466632A CN202110870971.1A CN202110870971A CN113466632A CN 113466632 A CN113466632 A CN 113466632A CN 202110870971 A CN202110870971 A CN 202110870971A CN 113466632 A CN113466632 A CN 113466632A
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01R31/08—Locating faults in cables, transmission lines, or networks
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Abstract
The invention discloses a system and a method for searching for direct current grounding without power outage, which comprises a direct current bus anode, a direct current bus cathode, a dual-power source undisturbed switching device I-way power source anode, a dual-power source undisturbed switching device I-way power source cathode, a dual-power source undisturbed switching device II-way power source anode, a dual-power source undisturbed switching device II-way power source cathode, a standby direct current power source system, a dual-power source undisturbed switching device, other load branch circuit breakers, a load branch circuit breaker to be tested, a dual-power source switching device output anode, a dual-power source switching device output cathode, other load branches and a load branch to be tested.
Description
Technical Field
The invention belongs to the technical field of electrical equipment of power plants, and relates to a system and a method for searching for direct current grounding without power failure.
Background
The direct current system is widely applied to thermal power plants, hydroelectric power plants, various transformer substations and other places using direct current equipment, and provides direct current power supply equipment for protection, automatic devices, communication, emergency lighting, emergency power supply and breaker opening and closing operations. The direct current system is an independent power supply, is not influenced by a generator, auxiliary power and a system running mode, and ensures important equipment for providing the direct current power supply under the condition that external alternating current is interrupted. Therefore, its importance is self evident.
The insulation of the positive pole or the negative pole of the direct current system is reduced or the ground fault is a common fault of the direct current system, so that the voltage deviation of the positive pole or the negative pole of the direct current system to the ground can be caused, incorrect actions of equipment such as protection, safety automatic devices and the like can be caused, and the fault needs to be eliminated in time. The method is characterized in that a load branch is connected with a load by a load branch line, and the load branch line is connected with a load through a load branch line.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a system and a method for searching a load branch without power failure, and the system and the method can realize the operation of pulling the load branch without power failure and ensure the safety of the system.
In order to achieve the purpose, the uninterrupted DC grounding search system comprises a DC bus anode, a DC bus cathode, a dual-power source undisturbed switching device I path power source anode, a dual-power source undisturbed switching device I path power source cathode, a dual-power source undisturbed switching device II path power source anode, a dual-power source undisturbed switching device II path power source cathode, a standby DC power source system, a dual-power source undisturbed switching device, other load branch circuit breakers, a load branch circuit breaker to be detected, a dual-power source switching device output anode, a dual-power source switching device output cathode, other load branches and a load branch to be detected;
the direct current bus anode and the direct current bus cathode are connected with other load branches through other load branch circuit breakers, and the direct current bus anode 1 and the direct current bus cathode are connected with a load branch to be tested through a load branch circuit breaker to be tested;
the double-power-supply undisturbed switching device comprises a double-power-supply switching device I path switching switch and a double-power-supply switching device II path switching switch, wherein a double-power-supply undisturbed switching device I path power supply positive pole and a double-power-supply undisturbed switching device I path power supply negative pole are connected with one side of the double-power-supply switching device I path switching switch;
the circuit between the positive pole of the direct current bus and the circuit breaker of the load branch to be tested is connected with the positive pole of the power supply of the I path of the double-power-supply undisturbed switching device;
a circuit between the negative electrode of the direct current bus and the circuit breaker of the load branch to be tested is connected with the negative electrode of the I-path power supply of the double-power-supply undisturbed switching device;
the circuit between the circuit breaker of the load branch to be tested and the load branch to be tested is connected with the circuit between the output anode of the dual power supply switching device and the output cathode of the dual power supply switching device;
the standby direct-current power supply system is connected with the positive pole of the II-path power supply of the double-power-supply undisturbed switching device and the negative pole of the II-path power supply of the double-power-supply undisturbed switching device.
The circuit between the positive pole of the direct current bus and the circuit breaker of the load branch to be tested and the positive pole of the power supply of the double-power-supply undisturbed switching device I, the circuit between the negative pole of the direct current bus and the circuit breaker of the load branch to be tested and the negative pole of the power supply of the double-power-supply undisturbed switching device I, the circuit between the circuit breaker of the load branch to be tested and the circuit between the output positive pole of the double-power-supply switching device and the output negative pole of the double-power-supply switching device I, and the standby direct current power supply system and the positive pole of the power supply of the double-power-supply undisturbed switching device II and the negative pole of the power supply of the double-power-supply undisturbed switching device II are connected through wires and wire clamps.
The uninterrupted DC ground searching method comprises the following steps:
1) setting a double-power undisturbed switching device into a first-path closing mode and a second-path opening mode;
2) connecting a path I power supply of the double-power-supply undisturbed switching device with the input end of a load branch circuit breaker to be tested;
3) connecting a second power supply of the double-power-supply undisturbed switching device with a standby direct-current power supply system;
4) connecting the output end of the double-power-supply undisturbed switching device with the output end of a to-be-tested load branch circuit breaker;
5) the power supply breaker of the load branch to be tested is disconnected, and the load branch to be tested is supplied with power through the I path of the double-power-supply undisturbed switching device;
6) the double-power-supply undisturbed switching device is set to be in a mode of I-path disconnection and II-path closing, a load branch to be detected is instantaneously switched to the II path, and a standby direct-current power supply system supplies power;
7) judging whether the direct current system ground fault phenomenon disappears, and turning to the step 8) when the direct current system ground fault phenomenon disappears, otherwise, detecting the next load branch to be detected, and turning to the step 2);
8) and the current load branch to be tested has a ground fault.
The invention has the following beneficial effects:
the uninterrupted DC ground search system and the uninterrupted DC ground search method have the advantages that during specific operation, the double-power-supply undisturbed switching device is used, the load of the load branch to be detected is instantaneously (less than 5ms) transferred to the standby DC section, and during the ground fault search of the DC system, the uninterrupted operation of the pull-out load branch is realized, the safety of a firepower and hydroelectric power plant, various substations and other DC equipment systems is ensured, the online fault search of DC equipment with voltage levels of 220V, 110V and the like is realized, the cost is lower, the design concept is ingenious, the principle is simple, field personnel can easily master the system, and the application scope is wide.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a flow chart of the present invention.
The system comprises a direct-current bus anode 1, a direct-current bus cathode 2, a dual-power undisturbed switching device I power anode 3, a dual-power undisturbed switching device I power cathode 4, a dual-power undisturbed switching device II power anode 5, a dual-power undisturbed switching device II power cathode 6, a wire clamp 7, a wire 8, a standby direct-current power system 9, a dual-power undisturbed switching device 10, a dual-power undisturbed switching device I circuit switcher 11, a dual-power undisturbed switching device II circuit switcher 12, other load branch circuit breakers 13, a to-be-tested load branch circuit breaker 14, a dual-power switching device output anode 15, a dual-power switching device output cathode 16, other load branches 17 and to-be-tested load branches 18.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
Referring to fig. 1, the uninterrupted dc ground search system of the present invention includes a dc bus positive electrode 1, a dc bus negative electrode 2, a dual-power source undisturbed switching device I-way power source positive electrode 3, a dual-power source undisturbed switching device I-way power source negative electrode 4, a dual-power source undisturbed switching device II-way power source positive electrode 5, a dual-power source undisturbed switching device II-way power source negative electrode 6, a wire clamp 7, a wire 8, a standby dc power source system 9, a dual-power source undisturbed switching device 10, other load branch circuit breakers 13, a load branch circuit breaker to be detected 14, a dual-power source switching device output positive electrode 15, a dual-power source switching device output negative electrode 16, other load branch circuits 17, and a load branch circuit to be detected 18;
the direct current bus anode 1 and the direct current bus cathode 2 are connected with other load branches 17 through other load branch circuit breakers 13, and the direct current bus anode 1 and the direct current bus cathode 2 are connected with a load branch 18 to be tested through a load branch circuit breaker 14 to be tested;
the dual-power undisturbed switching device 10 comprises a dual-power switching device I-path switch 11 and a dual-power switching device II-path switch 12, the positive electrode 3 and the negative electrode 4 of the I-path power supply of the double-power-supply undisturbed switching device are connected with one side of the I-path switching switch 11 of the double-power-supply switching device, the positive electrode 5 and the negative electrode 6 of the II-path power supply of the double-power-supply switching device are connected with one side of the II-path switching switch 12 of the double-power-supply switching device, the positive electrode and the negative electrode of the other side of the I-path switching switch 11 of the double-power-supply switching device are respectively connected with the output positive electrode 15 and the output negative electrode 16 of the double-power-supply switching device, and the positive electrode and the negative electrode of the other side of the II-path switching switch 12 of the double-power-supply switching device are respectively connected with the output positive electrode 15 and the output negative electrode 16 of the double-power-supply switching device.
The circuit between the direct current bus anode 1 and the load branch circuit breaker 14 to be tested and the dual-power undisturbed switching device I circuit power anode 3 are connected through a wire 8 and a wire clamp 7, the circuit between the direct current bus cathode 2 and the load branch circuit breaker 14 to be tested and the dual-power undisturbed switching device I circuit power cathode 4 are connected, the circuit between the load branch circuit breaker 14 to be tested and the load branch circuit 18 to be tested and the circuit between the dual-power switching device output anode 15 and the dual-power switching device output cathode 16 are connected, and the standby direct current power system 9 and the dual-power undisturbed switching device II circuit power anode 5 and the dual-power undisturbed switching device II circuit power cathode 6 are connected through a wire 8 and a wire clamp 7.
Referring to fig. 2, the uninterruptible dc ground search method of the present invention includes the following steps:
1) the double-power-supply undisturbed switching device 10 is set to be in a way I closing mode and a way II opening mode;
2) connecting a path I power supply of the double-power-supply undisturbed switching device 10 with the input end of a load branch circuit breaker 14 to be tested;
3) connecting a second power supply of the double-power-supply undisturbed switching device 10 with a standby direct-current power supply system 9;
4) connecting the output end of the double-power-supply undisturbed switching device 10 with the output end of a load branch circuit breaker 14 to be tested;
5) the power breaker 14 of the load branch circuit to be tested is disconnected, and the load branch circuit 18 to be tested is powered by the I path of the double-power-supply undisturbed switching device 10;
6) the double-power-supply undisturbed switching device 10 is set to be in a way I open mode and a way II closed mode, a load branch 18 to be detected is instantaneously switched to the way II, and the standby direct-current power supply system 9 supplies power;
7) judging whether the direct current system ground fault phenomenon disappears, and turning to the step 8) when the direct current system ground fault phenomenon disappears, otherwise, detecting the next load branch 18 to be detected, and turning to the step 2);
8) the load branch 18 currently under test has a ground fault.
The dual-power undisturbed switching device 10 is a device for realizing undisturbed dual-power switching functions of ASCO, ATS, fast switching and the like.
The standby dc power supply system 9 includes a dc bus, a storage battery, and a rectifying device.
Claims (6)
1. A direct current grounding search system without power outage is characterized by comprising a direct current bus anode (1), a direct current bus cathode (2), a dual-power-source undisturbed switching device I-path power anode (3), a dual-power-source undisturbed switching device I-path power cathode (4), a dual-power-source undisturbed switching device II-path power anode (5), a dual-power-source undisturbed switching device II-path power cathode (6), a standby direct current power system (9), a dual-power-source undisturbed switching device (10), other load branch circuit breakers (13), a load branch circuit breaker to be detected (14), a dual-power-source switching device output anode (15), a dual-power-source switching device output cathode (16), other load branch circuits (17) and a load branch circuit to be detected (18);
the direct current bus positive pole (1) and the direct current bus negative pole (2) are connected with other load branches (17) through other load branch circuit breakers (13), and the direct current bus positive pole (1) and the direct current bus negative pole (2) are connected with a load branch circuit (18) to be tested through a load branch circuit breaker (14) to be tested;
the double-power-supply undisturbed switching device (10) comprises a double-power-supply switching device I-path switching switch (11) and a double-power-supply switching device II-path switching switch (12), wherein a double-power-supply undisturbed switching device I-path power positive electrode (3) and a double-power-supply undisturbed switching device I-path power negative electrode (4) are connected with one side of the double-power-supply switching device I-path switching switch (11), a double-power-supply undisturbed switching device II-path power positive electrode (5) and a double-power-supply undisturbed switching device II-path power negative electrode (6) are connected with one side of the double-power-supply switching device II-path switching switch (12), a positive electrode and a negative electrode of the other side of the double-power-supply switching device I-path switching switch (11) are respectively connected with a double-power-supply switching device output positive electrode (15) and a double-power-supply switching device output negative electrode (16), and a positive electrode of the other side of the double-supply switching device II-path switching switch (12) are respectively connected with a double-power-supply switching device output positive electrode (15) and a double-supply switching device output negative electrode The poles (16) are connected;
a circuit between the direct current bus positive pole (1) and a load branch circuit breaker (14) to be tested is connected with the power supply positive pole (3) of the double-power-supply undisturbed switching device I;
a circuit between the DC bus negative electrode (2) and a load branch circuit breaker (14) to be tested is connected with the I-way power supply negative electrode (4) of the double-power-supply undisturbed switching device;
a circuit between the load branch circuit breaker (14) to be tested and the load branch circuit (18) to be tested is connected with a circuit between an output positive pole (15) of the dual power supply switching device and an output negative pole (16) of the dual power supply switching device;
the standby direct-current power supply system (9) is connected with the positive pole (5) of the II-path power supply of the double-power-supply undisturbed switching device and the negative pole (6) of the II-path power supply of the double-power-supply undisturbed switching device.
2. The non-stop DC-DC lookup system according to claim 1, the circuit between the direct current bus anode (1) and the load branch circuit breaker (14) to be tested is connected with the circuit between the double-power-source undisturbed switching device I circuit power anode (3), the circuit between the direct current bus cathode (2) and the load branch circuit breaker (14) to be tested is connected with the double-power-source undisturbed switching device I circuit power cathode (4), the circuit between the load branch circuit breaker (14) to be tested and the load branch circuit (18) to be tested is connected with the circuit between the double-power-source switching device output anode (15) and the double-power-source switching device output cathode (16), and the standby direct current power system (9) is connected with the double-power-source undisturbed switching device II circuit power anode (5) and the double-power-source undisturbed switching device II circuit power cathode (6) through the wires (8) and the wire clamps (7).
3. The uninterruptible direct current grounding lookup system of claim 1 wherein the dual-power undisturbed switching device (10) is an ATS.
4. The uninterruptible direct current ground lookup system of claim 1 wherein the dual-power undisturbed switching device (10) is an ASCO.
5. The uninterruptible direct current ground search system according to claim 1, wherein the backup direct current power supply system (9) comprises a direct current bus, a storage battery, and a rectifying device.
6. A method for searching for a dc ground without power outage, which is based on the system of claim 1, and comprises the following steps:
1) the double-power-supply undisturbed switching device (10) is set to be in a way I closing mode and a way II opening mode;
2) connecting a path I power supply of the double-power-supply undisturbed switching device (10) with the input end of a load branch circuit breaker (14) to be tested;
3) connecting a second-path power supply of the double-power-supply undisturbed switching device (10) with a standby direct-current power supply system (9);
4) connecting the output end of the double-power-supply undisturbed switching device (10) with the output end of a load branch circuit breaker (14) to be tested;
5) a load branch power circuit breaker (14) to be tested is disconnected, and a load branch (18) to be tested is powered by a first circuit of the double-power-supply undisturbed switching device (10);
6) the double-power-supply undisturbed switching device (10) is set to be in a mode of I-path disconnection and II-path closing, a load branch (18) to be detected is instantaneously switched to the II path, and a standby direct-current power supply system (9) supplies power;
7) judging whether the direct current system ground fault phenomenon disappears, and turning to the step 8) when the direct current system ground fault phenomenon disappears, otherwise, detecting the next load branch (18) to be detected, and turning to the step 2);
8) the current load branch (18) to be tested has a ground fault.
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| CN202110870971.1A CN113466632B (en) | 2021-07-30 | 2021-07-30 | Uninterrupted DC grounding searching system and uninterrupted DC grounding searching method |
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| CN202110870971.1A CN113466632B (en) | 2021-07-30 | 2021-07-30 | Uninterrupted DC grounding searching system and uninterrupted DC grounding searching method |
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| CN113466632B CN113466632B (en) | 2023-12-19 |
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