CN102200555A - Real-time detector for ground safety resistor of information technology (IT) power grid - Google Patents
Real-time detector for ground safety resistor of information technology (IT) power grid Download PDFInfo
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- CN102200555A CN102200555A CN2010101308079A CN201010130807A CN102200555A CN 102200555 A CN102200555 A CN 102200555A CN 2010101308079 A CN2010101308079 A CN 2010101308079A CN 201010130807 A CN201010130807 A CN 201010130807A CN 102200555 A CN102200555 A CN 102200555A
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Abstract
The invention discloses a real-time detector for a ground safety resistor of an information technology (IT) power grid. The real-time detector comprises a power module, a test module and a signal processing module which are connected with one another sequentially, and a test transformer, wherein the test transformer is accessed into a tested power grid; a test signal is acquired from a neutral point of a preliminary winding of the test transformer and input into the test module; the test module provides a low-frequency test source; the output end of the test transformer is connected with the power module; and the signal processing module finishes sampling, acquisition and processing of the signal. By the real-time detector for the ground safety resistor of the IT power grid, a system real-time ground resistance and a real-time alarm output can be detected; and an aim of continuous power supply of the power grid can be fulfilled.
Description
Technical field
The present invention relates to a kind of safety detector over the ground, the safe over the ground resistance monitor of particularly a kind of IT real-time power network.
Background technology
It mostly at present domestic insulation status at high and low voltage electric distribution equipment, but actual time safety condition detection at IT mains supply system, and experimental technique, information processing manner all do not have concrete product, therefore press for produce a kind of can be to the detector of the actual time safety condition detection of IT mains supply system.And the detection system over the ground in real time of external product test I T mains supply system, as shown in Figure 1, comprise that mainly power module 1 inserts tested electrical network 5 by transformer, power module 1, test module 2, signaling module 3 connect successively, and the test signal of test module inserts tested electrical network 5 by isolation resistance.Fig. 1 frame of broken lines part, this signal inserts transformer through isolation resistance, and the isolation performance of this kind mode, security performance and Electro Magnetic Compatibility are poor.
Summary of the invention
For solving the problems referred to above that prior art exists, the present invention proposes a kind of the present invention and can be solved by the following technical programs:
The safe over the ground resistance monitor of a kind of IT real-time power network of the present invention, it comprises a power module, a test module and a signal processing module that connects successively, also comprise a test transformer, insert tested electrical network by described test transformer, obtain a test signal from the neutral point of described test transformer, and be input to described test module, described test module provides a low frequency test source, the described power module of output termination of described test transformer, described signal processing module is finished sample of signal collection and signal Processing.
The present invention also comprises an alarm module, links to each other with the central processing unit of described signal processing module.
Test module of the present invention over the ground 50Hz power supply equiva lent impedance greater than 1M ohm.
Low frequency test source of the present invention is the 7.5HZ20V AC signal.
Owing to adopt above technical scheme, the safe over the ground resistance monitor of a kind of IT real-time power network of the present invention, the resistance to earth size that can reflect the IT electric power system in real time can in time be found trouble spot and alarm investigation trouble spot, strengthens the IT power supply grid ability of power supply continuously.
Description of drawings
Fig. 1 is the safe over the ground resistance monitor schematic diagram of known IT real-time power network
Fig. 2 is the safe over the ground resistance monitor schematic diagram of IT real-time power network of the present invention
Among the figure 1, power module; 2, test module; 3, signal processing module; 4, alarm module; 5, tested electrical network; 6, the test transformer.
Embodiment
Below in conjunction with embodiment, further set forth the present invention:
As shown in Figure 2, the safe over the ground resistance monitor of a kind of IT real-time power network of the present invention, it comprises the power module 1 that connects successively, test module 2 and signal processing module 3, also comprise test transformer 6, insert tested electrical network 5 by test transformer 6, obtain a test signal from the neutral point of test transformer 6 primary coils, and be input to test module 2, test module provides a low frequency test source, this low frequency test source is 7.5HZ, 20V AC signal, the output termination power module 1 of test transformer, signal processing module 3 comprises sample of signal modulation circuit and central processing unit, finishes sample of signal collection and signal Processing.Comprise that also alarm module 4 can send alerting signal in real time.
Principle of work of the present invention is: the power supply that testing apparatus will be different from power frequency is added between test transformer 6 intermediate contacts and the electrical network load region the earth as the test source of test module 2, test transformer 6 directly links to each other with the IT power supply network, synchronous signal sampling modulation circuit detects the measuring current size that flows through measurement circuit in real time, and signal converter is sampled to the electric current of test frequency and is sent data to central processor CPU after filtering power frequency and the higher hamonic wave thereof, CPU carries out the waveform reduction to these data to be handled, calculate insulation against ground resistance value size and this data in real time is passed to the warning panel according to waveform, for panel warning reference.
As a preferred embodiment of the present invention be:
1, signal processing module part
Core technology mainly comprises the signal sampling technology in the signals collecting modulation circuit, because the test source signal that applies is the 7.5Hz sine wave, so size that reflects system's insulation against ground resistance that the amplitude of the signal of 7.5Hz frequency domain can be definite only, therefore the science of will carrying out the signal of this frequency domain is sampled and could truly be reflected the waveform signal of this frequency domain, that is to say that Sampling techniques must satisfy sampling thheorem and be whole ripple sampling, otherwise can not guarantee the accuracy of signal restoring.
Because test signal is the cycle sine wave signal, utilizes discrete Fourier transform (DFT) to realize the accurate analysis of signal, algorithm can reflect the size of IT system insulation against ground resistance accurately according to this.And this algorithm will realize on embedded microprocessor that technology is comparatively advanced.
2, test module part
Major technique also comprises the testing power supply technology, because equipment will insert the IT electrical network, because the IT electrical network will guarantee the safe operation earth impedance certain requirement is arranged, it is later on minimum to the influence of electrical network that this also just requires the Insulation test hanging equipment to receive electrical network, and the equiva lent impedance over the ground that requires entire equipment is greater than 1M ohm.Therefore the connection of total system has suitable technology.Guaranteed that like this equipment can ignore to electric network influencing.
3, test signal applies mode
The mode that applies of signal all has material impact to the security of network system and electrical network to the security of equipment.The product signal of these research and development applies frame of broken lines in the mode See Figure 2.This kind signal applies the neutral point that mode has been utilized the primary coil of transformer 6; this neutral point is the neutral point of single-circuit transformer; make the buffer action that plays between test macro and the electrical network to a certain degree; anti-Disturbance in Power Net and impact capacity are strengthened; security performance to equipment self plays the certain protection effect simultaneously, has improved the Electro Magnetic Compatibility of system.
The present invention takes above-mentioned technology, the resistance to earth size that can in time reflect the IT electric power system, can in time find first trouble spot, guarantee alarm investigation trouble spot under the situation that second trouble spot does not take place, do not disturb electrical network normal power supply ability, ensured the IT power supply grid ability of power supply continuously.
But above-mentioned embodiment is exemplary, is to be the restriction that this patent is comprised scope in order better to make those skilled in the art can understand this patent, can not to be interpreted as; So long as according to spirit that this patent discloses done anyly be equal to change or modify, all fall into the scope that this patent comprises.
Claims (4)
1. safe over the ground resistance monitor of IT real-time power network, it comprises a power module, a test module and a signal processing module that connects successively, it is characterized in that: also comprise a test transformer, insert tested electrical network by described test transformer, obtain a test signal from the neutral point of described test transformer, and be input to described test module, described test module provides a low frequency test source, the described power module of output termination of described test transformer, described signal processing module is finished sample of signal collection and signal Processing.
2. the safe over the ground resistance monitor of a kind of IT real-time power network according to claim 1 is characterized in that: also comprise an alarm module, link to each other with the central processing unit of described signal processing module.
3. the safe over the ground resistance monitor of a kind of IT real-time power network according to claim 1 is characterized in that: the power supply of the 50Hz over the ground equiva lent impedance of described test module is greater than 1M ohm.
4. according to the safe over the ground resistance monitor of each described a kind of IT real-time power network among the above claim 1-3, it is characterized in that: described low frequency test source is 7.5HZ, the 20V AC signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101308079A CN102200555A (en) | 2010-03-23 | 2010-03-23 | Real-time detector for ground safety resistor of information technology (IT) power grid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101308079A CN102200555A (en) | 2010-03-23 | 2010-03-23 | Real-time detector for ground safety resistor of information technology (IT) power grid |
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| CN102200555A true CN102200555A (en) | 2011-09-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010101308079A Pending CN102200555A (en) | 2010-03-23 | 2010-03-23 | Real-time detector for ground safety resistor of information technology (IT) power grid |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103713199A (en) * | 2012-10-04 | 2014-04-09 | 本德尔有限两合公司 | Method for monitoring and measuring an insulation resistance with interference-resistant measuring signal |
| CN109406879A (en) * | 2018-12-11 | 2019-03-01 | 上海华宿电气股份有限公司 | Insulation detection device and system |
-
2010
- 2010-03-23 CN CN2010101308079A patent/CN102200555A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103713199A (en) * | 2012-10-04 | 2014-04-09 | 本德尔有限两合公司 | Method for monitoring and measuring an insulation resistance with interference-resistant measuring signal |
| US9632131B2 (en) | 2012-10-04 | 2017-04-25 | Bender Gmbh & Co. Kg | Method for monitoring and measuring an insulation resistance with interference-resistant measuring signal |
| CN103713199B (en) * | 2012-10-04 | 2017-08-08 | 本德尔有限两合公司 | Using anti-interference measurement signal come the method for monitoring and measuring insulaion resistance |
| CN109406879A (en) * | 2018-12-11 | 2019-03-01 | 上海华宿电气股份有限公司 | Insulation detection device and system |
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Application publication date: 20110928 |