CN100526890C - Neutral point grounding resistor monitoring device - Google Patents
Neutral point grounding resistor monitoring device Download PDFInfo
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- CN100526890C CN100526890C CNB2007101084517A CN200710108451A CN100526890C CN 100526890 C CN100526890 C CN 100526890C CN B2007101084517 A CNB2007101084517 A CN B2007101084517A CN 200710108451 A CN200710108451 A CN 200710108451A CN 100526890 C CN100526890 C CN 100526890C
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- 238000012806 monitoring device Methods 0.000 title claims abstract description 18
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- 230000002093 peripheral effect Effects 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 238000010891 electric arc Methods 0.000 description 2
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- 101150069896 PNP1 gene Proteins 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 102100033014 Tyrosine-protein phosphatase non-receptor type 13 Human genes 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
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Abstract
本发明涉及一种监测设备，特别是一种中性点接地电阻器监测装置，包括微处理单元和分别与所述微处理单元相连的采集单元、告警单元、存储单元和继电控制单元，所述采集单元用于采集电阻器运行状态数据发送给所述微处理单元，所述继电控制单元用于在所述微处理单元的控制下切断电阻器。本发明对电阻器的电流和温度进行监测，判断电阻器是否处于正常运行状态，如果电阻器电流或温度超过门限值，说明电阻器为非正常工作，报警并切断电阻器，从而大大延长系统设备使用寿命，使系统运行的安全可靠性得到更大的提高，同时满足了现今变电站对于无人值守的发展要求。
The present invention relates to a monitoring device, especially a neutral point grounding resistor monitoring device, which includes a micro-processing unit, an acquisition unit, an alarm unit, a storage unit and a relay control unit respectively connected to the micro-processing unit. The acquisition unit is used to collect the operating state data of the resistor and send it to the micro-processing unit, and the relay control unit is used to cut off the resistor under the control of the micro-processing unit. The invention monitors the current and temperature of the resistor to judge whether the resistor is in a normal operating state. If the resistor current or temperature exceeds the threshold value, it indicates that the resistor is not working normally, and the resistor is alarmed and the resistor is cut off, thus greatly extending the system life. The service life of the equipment has greatly improved the safety and reliability of the system operation, and at the same time met the development requirements of unattended substations today.
Description
Technical field
The present invention relates to a kind of monitoring equipment, particularly a kind of neutral resistance device monitoring device.
Background technology
In recent years, along with developing rapidly of China's power industry, the structural change of urban power distribution network is very big, the shared proportion of cable is increasing in feeder line, cable is that the singlephase earth fault of main distribution net mostly is system equipment under certain condition because the puncture that self insulation defect causes, and the ground connection residual flow is bigger, especially when earth point during at cable, ground arc is a closure electric arc, electric arc is difficult more, and (arc light that unbalanced earth fault capacitance current produced can be from the numerical value of horizontal blanking from horizontal blanking, much smaller than the numerical value of rules defined, only be 5A to twisted polyethylene cable), so the singlephase earth fault of cable power distribution network mostly is permanent fault.
When taking place, earth fault should not operate with failure.From practical operation situation, in power distribution network based on cable, isolated neutral or enclose under the earthing mode through the extinguishing arc line, the phase fault that singlephase earth fault causes is more.Some actual accidents show that singlephase earth fault develops into phase-to phase fault, have enlarged the power failure scope on the contrary, especially when developing into the busbar short-circuit fault, be equivalent to transformer outlet short circuit, and since at present some transformer Short Circuit withstand impact capacities a little less than, thereby may cause transformer to damage.
See the dual power supply mode with regard to the actual conditions of urban power distribution network power supply mode, the employing of aerial insulated wire, looped network arranges that the open loop method of operation, factors such as cable line proportion have caused and adopted isolated neutral or not outstanding through the advantage of grounding through arc mode.From having changed at present transformer station's practical operation situation analysis of low resistance grounding mode; The protection configuration is proper, can not reduce power supply reliability.Therefore the neutral resistance cabinet is used extensive all the more.
But resistor box hinders the sudden change of the current value of moment and temperature for some reason in operational process very big, and particularly when intermittent arc grounding took place, the fault case that has repeatedly added up.Traditional neutral resistance and equipment all do not adopt any monitoring equipment that these variations of resistor box are monitored.
Summary of the invention
The present invention has overcome above-mentioned shortcoming, a kind of reliability height is provided, can have prolonged the resistor neutral resistance device monitoring device in serviceable life.
The present invention solves the technical scheme that its technical matters takes: a kind of neutral resistance device monitoring device, comprise microprocessing unit and the collecting unit, Alarm Unit, storage unit and the relay control unit that link to each other with described microprocessing unit respectively, described collecting unit is used to gather the resistor running state data and sends to described microprocessing unit, and described relay control unit is used for the control incision resistance break device at described microprocessing unit.
Also can comprise the communications interface unit that links to each other with described microprocessing unit.
Also can comprise the display unit that links to each other with described microprocessing unit.
Described collecting unit can comprise current acquisition circuit and the temperature collection circuit that links to each other with described microprocessing unit respectively.
Described Alarm Unit can comprise the audible alarm circuit or/and indicator light circuit.
Described microprocessing unit can be made of CPU and peripheral circuit thereof, and described peripheral circuit comprises watchdog circuit, clock circuit.
Described microprocessing unit also can be connected with the keyboard input block.
Described microprocessing unit also can be connected with the switching value input block, can realize the manual control to supervising device, as manual off resistance device connection etc.
Described relay control unit can comprise photoelectrical coupler and relay, after the output of described microprocessing unit is isolated signal through photoelectrical coupler, controls described relay contact action, is switched on or switched off resistor.
The present invention monitors the electric current and the temperature of resistor, judge whether resistor is in normal operating condition, if resistor electric current or temperature surpass threshold value, illustrate that resistor is a non-normal working, report to the police and the cut-out resistor, thereby prolong system equipment serviceable life greatly, the safe reliability of system's operation is got a greater increase, satisfied now transformer station simultaneously for unattended demand for development.
Description of drawings
Fig. 1 is a theory diagram of the present invention;
Fig. 2 is one of circuit theory diagrams of the present invention;
Fig. 3 is two of circuit theory diagrams of the present invention;
Fig. 4 is three of circuit theory diagrams of the present invention.
Embodiment
As shown in fig. 1, the present invention is the control core with CPU, the peripheral circuit of described CPU comprises watchdog circuit, clock circuit, current acquisition circuit and temperature collection circuit are sent into the signal that collects among the described CPU respectively, compare through described CPU and predefined threshold value, after surpassing thresholding, send alarm sound or light pilot lamp by indicator light circuit by the audible alarm circuit, send indicator signal, and cut off the trouble spot of resistor by the relay control unit that links to each other with described CPU, the RAM that links to each other with described CPU, E2PROM, FRAM is used for storing the relevant information of observation process, communications interface unit adopts standard RS485 communication interface and the communication of computer background supervisory system, and MODBUS is provided communications protocol.The display unit that links to each other with described CPU can realize that this locality checks parameter, running status etc., and described keyboard unit is used for setting and the typing operational factor.In addition, described CPU also is reserved with interface and is used to connect the switching value input block, can realize the manual control to supervising device, as manual off resistance device connection etc.
Be physical circuit schematic diagram of the present invention as shown in Figure 2, RAM U4 links to each other with CPU U1, realize data storage, display circuit by charactron LED1, LED2 and the transistor PNP1～PNP5 that is used to drive described charactron realize, can show multinomial information in real time.The mode of operation hommization, the operator can grasp at short notice, reads.Light emitting diode D1～D5 links to each other with CPU U1, constitute described indicator light circuit, button S1～S5 links to each other with described CPUU1, constitutes described keyboard unit, clock chip U2 and peripheral circuit thereof constitute described clock circuit, and transistor NPN1 connects a hummer SP1 and constitutes described audible alarm circuit.
As shown in Figure 3, circuit theory diagrams for relay control unit among the present invention, described relay control unit comprises two-way, constitute by photoelectrical coupler and relay respectively, one the tunnel being example wherein, after the output of CPU U1 is isolated signal through photoelectrical coupler U6, the action of pilot relay G1 contact, control is switched on or switched off resistor.
As shown in Figure 4, be current acquisition circuit theory diagrams among the present invention, current transformer CT1 is socketed in the resistor loop, after stabilivolt TVS4 voltage stabilizing and capacitor C 4 filtering are passed through in the output of described current transformer successively, is input among the described CPU U1 after amplifying via operational amplifier U3B again.
By the present invention the electric current and the temperature of resistor are monitored, temperature variation and the electric current gathered in the instant of failure resistance change, judge whether resistor is in normal operating condition, if resistor electric current or temperature surpass threshold value, illustrate that resistor is a non-normal working, report to the police and also to cut off resistor, thereby prolong system equipment serviceable life greatly, the safe reliability of system operation is got a greater increase, satisfied now transformer station simultaneously for unattended demand for development.Described communications interface unit can be realized the remote transmission and the control of data, the monitoring information that is stored in the storer such as RAM can also be sent on the display of long-range connection, realizes the real-time demonstration of monitoring waveform.
More than neutral resistance device monitoring device provided by the present invention is described in detail, used specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (9)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101084517A CN100526890C (en) | 2007-06-14 | 2007-06-14 | Neutral point grounding resistor monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101084517A CN100526890C (en) | 2007-06-14 | 2007-06-14 | Neutral point grounding resistor monitoring device |
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| Publication Number | Publication Date |
|---|---|
| CN101055301A CN101055301A (en) | 2007-10-17 |
| CN100526890C true CN100526890C (en) | 2009-08-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2007101084517A Active CN100526890C (en) | 2007-06-14 | 2007-06-14 | Neutral point grounding resistor monitoring device |
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| CN (1) | CN100526890C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU223706U1 (en) * | 2023-11-21 | 2024-02-29 | Акционерное общество "Рязанское конструкторское бюро "Глобус" (АО "РКБ "Глобус") | DC network insulation resistance monitoring device |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101499655B (en) * | 2008-11-06 | 2011-02-09 | 江苏省电力公司 | Power system neutral point grounding resistor complete set |
| RU2526221C2 (en) * | 2012-10-24 | 2014-08-20 | Российская Федерация, От Имени Которой Выступает Министерство Промышленности И Торговли Российской Федерации | Device to measure and monitor resistance of insulation in ac networks with resistive neutral under working voltage |
| RU2541418C9 (en) * | 2013-05-06 | 2015-05-10 | Российская Федерация, От Имени Которой Выступает Министерство Промышленности И Торговли Российской Федерации | Device for measurement and control of live resistance insulation in alternating-current mains with resistive neutral line |
| CN103454527A (en) * | 2013-08-30 | 2013-12-18 | 国家电网公司 | Temperature-rising test device for resistor in 10KV power grid |
| CN104104077B (en) * | 2014-08-04 | 2017-03-08 | 南京工程学院 | 20kV neutral grounding in distribution power network method for handover control and device |
| CN105375436A (en) * | 2015-12-14 | 2016-03-02 | 重庆市亚东亚集团变压器有限公司 | Automatic cutoff protection apparatus and method for overtime operation of neutral-point resistor cabinet |
| CN112984890B (en) * | 2019-12-12 | 2023-03-17 | 青岛海尔电冰箱有限公司 | Refrigerator |
-
2007
- 2007-06-14 CN CNB2007101084517A patent/CN100526890C/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU223706U1 (en) * | 2023-11-21 | 2024-02-29 | Акционерное общество "Рязанское конструкторское бюро "Глобус" (АО "РКБ "Глобус") | DC network insulation resistance monitoring device |
Also Published As
| Publication number | Publication date |
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| CN101055301A (en) | 2007-10-17 |
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Address after: 518057 Nanshan District high tech Industrial Village, Guangdong, R2,, B5 Patentee after: Farad Electric Co., Ltd. Address before: 518057 R2, hi tech Industrial Village, Guangdong, Shenzhen, B5 Patentee before: Shenzhen Hualite Electric Appliances Co., Ltd. |