Portable simulation resistor for calibration of direct current system insulation monitoring device
An insulation monitoring device and DC system technology, applied in the field of power systems, can solve the problems of increased parts loss, waste of manpower and material resources, increased labor load, etc.
Inactive Publication Date: 2014-12-24
STATE GRID CORP OF CHINA +2
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Problems solved by technology
Under normal circumstances, both R+ and R- are infinite, and the insulation monitoring device does not alarm. Only when DC grounding or low insulation occurs in the system, the low insulation signal is reported. Therefore, when the substation is put into operation and the DC system is checked and accepted , it is necessary to connect a resistance R' to the insulation monitoring device in series to verify the accuracy of the alarm value of the insulation monitoring device. Therefore, for the same voltage level, a variety of resistance values are required for testing. In this case, before each test, the It is necessary to carry all the resistors with different values, and all the resistors are placed scatteredly, which not only increases the labor load, but also increases the probability of parts being lost, causing a certain waste of manpower and material resources
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[0014] Such as figure 2 As shown, a portable adjustable analog resistor for DC system insulation monitoring device verification, including a box body 1, 8 wire posts arranged on the box body, and 7 interconnected wire posts arranged in the box body 1 Resistors, short wires 2 used to connect two wire posts, and connecting wires 3 used to connect the wire posts and the DC system insulation monitoring device, the bottom ends of each wire post are respectively connected to the wires between two adjacent resistors, The top of each wire column is exposed outside the box, and the resistors include a first resistor R1 with a resistance of 1.5KΩ, a second resistor R2 with a resistance of 2KΩ, a third resistor R3 with a resistance of 3KΩ, and a resistor with a resistance of 9KΩ. The fourth resistor R4, the fifth resistor R5 with a resistance value of 10KΩ, the sixth resistor R6 with a resistance value of 15KΩ, and the seventh resistor R7 with a resistance value of 20KΩ. The second wir...
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Abstract
The invention discloses a portable simulation resistor for calibration of a direct current system insulation monitoring device. The portable simulation resistor comprises a box body, eight lead columns arranged on the box body, seven resistors which are connected in series and are arranged in the box body, a shorting stub used for connecting two lead columns and a connecting wire used for connecting one lead column and the direct current system insulation monitoring device. The bottom ends of all the lead columns are connected with leads between every two resistors, and the top ends of all the lead columns are exposed out of the box body. When the portable simulation resistor is used, the connecting wire is used for connecting the corresponding lead column and the direct current system insulation monitoring device, the shorting stub is used for connecting the two different lead columns, and at last through permutation and combination of different resistance values, the resistors of various resistance values can be simulated. Needed resistance values can be adjusted conveniently and quickly in the testing process of the direct current insulation monitoring device, the reliability of the insulation monitoring device is calibrated accurately and quickly, and the calibration speed and accuracy of a direct current insulation device are greatly improved.
Description
technical field [0001] The invention relates to a portable analog resistor used for checking the insulation monitoring device of a DC system, and belongs to the technical field of power systems. Background technique [0002] As the main power supply system of the substation, the DC system is responsible for continuously providing reliable DC power to other equipment. The DC system mainly includes charging panels, feeding panels, and batteries. Among them, the insulation monitoring device in the feeding panel mainly judges the insulation status of the entire power system (including DC ground faults and low insulation caused by various reasons) by automatically measuring the insulation resistance value, and is used to quickly find the fault point , eliminate hidden dangers in time, and improve the safety factor of the DC system. Therefore, the reliability of the insulation monitoring device directly affects the safe operation of the power system. Effectively judging its reliab...
Claims
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Inventor 葛晶余杰沈丹周进何祺旻郑志光马史栋刘能
Owner STATE GRID CORP OF CHINA