Four-stage selective leakage rapid protection system of IT grouping power grid
A technology of protection system and leakage selection, which is applied in the direction of emergency protection circuit device, emergency protection device with automatic disconnection, electrical components, etc., can solve the problems that cannot solve the functional requirements and technical indicators of the four-level leakage selection system, and achieve the goal of avoiding gas The effect of coal dust explosion, ensuring the safety of personal electric shock, and solving the problem of leakage protection
Active Publication Date: 2013-03-13
SHANDONG DIANAN ELECTRIC CO LTD
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[0005] However, this patent application 200910018328.5 is only applicable to the low-voltage power grid with two levels of protection where the main switch and the sub-switches are all set in the same substation chamber, and cannot solve the functional requirements and technical indicators
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[0020] The present invention is described in detail below in conjunction with accompanying drawing and specific embodiment:
[0021] like figure 1 As shown, for the discrete setting of the branch switches in the "IT group power grid four-level leakage selection system", the bus switches of each component and the corresponding main line shunt switches are set in the substation chamber, the transformer low-voltage coil and 2 to 4 sets of lead wires The total back-up protection needs to rely on specific conditions such as the power switch on the high-voltage side of the transformer. The present invention includes a three-level comprehensive leakage protection device and a branch circuit leakage protection device. The three-level comprehensive leakage protection device includes a three-level comprehensive leakage protection device. The protection module and the peripheral wiring circuit are set in the substation chamber to realize the selective leakage protection of three levels i...
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The invention discloses a four-stage selective leakage rapid protection system of an IT grouping power grid on the basis of the application of three invention patents of ZL02110276.7, ZL200510042067.2 and ZL200510044820.1 and the disclosed invention patent the application number of which is 200910018328.5. The system comprises three-stage comprehensive selective leakage protecting devices without any communication and each branch selective leakage protector. In low-voltage power grids with zero sequence reactor compensation, the branch selective leakage protectors in discrete branch switches can definitely issue tripping commands in 30ms when human bodies touch branches, and the three-stage comprehensive selective leakage protecting device can definitely and selectively issue the tripping commands to trunk switches or bus switches in 100ms when the human bodies touch any place of the load sides of the low-voltage bus switches including the buses of the group and each trunk to which the buses belong, which realizes rapid and accurate leakage protection; for low-voltage power grids the voltages of which are lower than 660V, faulty lines can be definitely cut off nearby within 30mA.s safety value when the human bodies get electric shock.
Description
technical field [0001] The invention belongs to the field of power grid fault detection and safety protection, and in particular relates to a four-level leak-selection fast protection system for an IT group power grid whose neutral point is not directly grounded. Background technique [0002] The industrial and mining low-voltage power grid is usually connected to a main switch by a group of outgoing lines on the low-voltage side of the transformer, and then connected to multiple sub-switches in parallel to lead to multiple parallel feeder lines to form a two- to three-level tree distribution network. However, with the application and development of coal mine comprehensive mechanization and large-scale units, underground dry-type transformers (KBSG and KBSGZY) not only have a large capacity increase (up to 500KVA, 630KVA), but also the low-voltage side of the transformer is no longer a set of lead wires, but simultaneously To lead 2 to 4 sets of outgoing lines, 2 to 4 sets o...
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IPC IPC(8): H02H3/32
Inventor 傅桂兴付英
Owner SHANDONG DIANAN ELECTRIC CO LTD