Maintenance voltage detector of direct current system
A voltage detector, DC system technology, applied in the direction of measuring current/voltage, instruments, measuring devices, etc., can solve the problems of low execution efficiency, large workload, error-prone, etc., to achieve high maintenance efficiency, small workload, avoidance of Effects of Electrical Interference
Pending Publication Date: 2018-01-09
STATE GRID CORP OF CHINA +1
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Problems solved by technology
The disadvantages are: heavy workload, low execution efficiency and error-prone
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[0026] Such as figure 1 As shown, the DC system maintenance voltage detector includes a power module 1 , a DC voltage transmitter, a DC current transmitter 2 , a data processor 3 , a display module 4 , a key module 5 , and an air circuit breaker 6 . The maintenance line a is connected to the backup line b through the air circuit breaker 6 , and the air circuit breaker 6 is used to disconnect or close the maintenance line a and the backup line b, and the maintenance line a is connected to the power module 1 .
[0027] The DC voltage transmitter includes: a first DC voltage transmitter A, a second DC voltage transmitter B, and a third DC voltage transmitter C. The first DC voltage transmitter A is used to detect the maintenance line a, and the second DC voltage transmitter B is used to detect the backup line b, because the phase sequence needs to be detected, based on the original 0v-220v voltage transmitter in the market Add reverse connection detection circuit, such as imag...
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The invention provides a maintenance voltage detector of a direct current system. The detector comprises a power supply module, direct-current voltage transformers, direct-current current transformers, a data processor, a display module, a key module and an air circuit breaker. A maintenance circuit is connected with a standby circuit through the air circuit breaker. The first direct-current voltage transformer A is used for detecting the maintenance circuit. The second direct-current transformer B is used for detecting the standby circuit. The first direct-current voltage transformer A and the second direct-current transformer B are connected with the data processor through an inverse connection detection circuit. The third direct-current voltage transformer C is connected with the data processor. The direct-current transformers are connected with the data processor. According to the invention, in use, after the detection is connected, voltage grades of two access ends, wire sequenceand whether the to-be-accessed standby power supply suffers a grounding fault can be successively identified; real-time display can be performed; and the detector is advantaged by high maintenance efficiency, small workload and single-person operation.
Description
technical field [0001] The invention relates to a DC system maintenance voltage detector, which relates to the field of DC system maintenance of power generation substations. Background technique [0002] In power plants and substations, the DC system provides reliable DC power for control signals, relay protection, automatic devices, circuit breaker tripping, closing and other operating circuits. DC systems play a vital role in the safe operation of power plants and substations. Nowadays, when overhauling DC systems or replacing accessories, it is inevitable to temporarily dismantle one or more DC power supply lines. As an important part of power plants and substations, the DC system cannot be powered off. Therefore, before removing the required power supply line, it is necessary to take power from the bypass bus or other backup power supply lines to ensure the normal operation of each part, and restore the original line after the work is completed. However, in actual op...
Claims
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IPC IPC(8): G01R19/00G01R29/18
Inventor 黄南颜爱国向世桂艾洪涛胡翰文郭余翔冯强陈佳琪石志峰倪呈祥刘春意高峡江文博张海军尤勇
Owner STATE GRID CORP OF CHINA