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Synthetic monitoring method and device in medium-voltage power supply system

A power supply system, automatic monitoring technology, applied in the direction of circuit devices, emergency protection circuit devices, information technology support systems, etc., can solve problems such as user impact, short-term power outages, etc.

Active Publication Date: 2008-10-15
CHANGCHUN POWER SUPPLY OF JILIN POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, we adopted the method of pulling the road to select the faulty line, causing a short-term power outage on the intact line that should not be blacked out, which has a great impact on users

Method used

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  • Synthetic monitoring method and device in medium-voltage power supply system
  • Synthetic monitoring method and device in medium-voltage power supply system

Examples

Experimental program
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Embodiment Construction

[0024] Refer to Figure 1, figure 2 , First press figure 2 Configure the device of the present invention and install it in a substation. Connect each bus voltage transformer, current transformers in each loop, and zero-sequence current transformer secondary wires on the outgoing cables to the terminal block of the device, It must be ensured that the polarity of the incoming secondary line is correct; then follow the steps below:

[0025] 1. After the device is put into operation, all the voltage and current of the substation can be sent to the respective sample-and-hold boards in the device for data sampling. The number of sampling points for each cycle is not less than 96, and the sampling time of each volume must be consistent with each other. Each sampled data should be composed of amplitude, direction and time;

[0026] 2. After the sampled data is converted into a digital quantity by the A / D conversion module, it is sent to the computer system via the data bus. The CPU host is...

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Abstract

The invention relates to a comprehensive automatic monitoring method for a middle-voltage power supply system, which solves the problem that a faulty line is selected correctly in a short time when an isolated neutral system or a small current grounding system has single-phase grounding failure and puts forward an opinion that during line selection process, a comparison is made between the time value of reference quantity and the time value of zero-sequence current at the same time and a method comprising the steps of sampling and wave-recording for 24 hours, continuously recording the condition of each electrical quantity, carrying out data analyzing and processing, releasing warning, displaying and storing results once abnormal conditions occur and unloading the results by a remote transmitting system. The method has simple calculation and high correctness. As a device collects all electrical quantities of a power substation, the statistics of situation that a main transformer is impacted by short cut, analysis on the harmonic components of current and the statistical calculation of the qualification rate of voltage can be achieved.

Description

Technical field: [0001] The invention relates to the monitoring of the operating conditions of a power supply system, in particular to a comprehensive automatic monitoring method and device for a medium voltage power supply system. Background technique: [0002] At present, although the level of automation in the substation is very high, it has not conducted online analysis of the normal and abnormal operation of the system through the monitoring of electrical quantities, and issued correct warning information in time. For example: single-ground fault line selection for neutral-point ungrounded systems (or low-current grounded systems), statistics of main transformers subjected to short-circuit impact, harmonic analysis, statistical calculation of voltage qualification rate, etc. [0003] my country's 66kV to 10kV power supply systems are mostly neutral point ungrounded systems or small current grounded systems. The system is allowed to continue to operate for a period of time wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02J13/00
CPCY02E60/723Y02E60/725Y04S10/16Y04S10/20Y02E60/00
Inventor 黄沛昕
Owner CHANGCHUN POWER SUPPLY OF JILIN POWER
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