CN101964516A - Three-phase four-wire system zero-line failure and open-phase intelligent protector - Google Patents
Three-phase four-wire system zero-line failure and open-phase intelligent protector Download PDFInfo
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Abstract
The invention discloses a three-phase four-wire system zero-line failure and open-phase intelligent protector. The outputs of a current transformer and a voltage transformer are connected to the input of a range switching module; the range switching module, a data processing module, a CPU logic controller and a drive circuit are connected with each other in sequence; one output switch trip signal of the drive circuit is connected with a switch with an opening coil, and the other output alarm signal is connected with a background management center; and the CPU logic controller is connected with a remote management center or terminal through a communication module. The invention can be used for directly judging whether the zero line goes wrong and transmitting a protection control signal after the failure occurs, so that the switch trips to cut off the failure rear-end power circuit, thereby achieving the goal of protecting equipment and personal safety. Meanwhile, an alarm signal is transmitted to the background management machine to carry out the corresponding treatment, thereby realizing the function of alarm report; and the failure information can quickly make decisions for treating the power-off accident, thereby shortening the power-off time.
Description
Technical field
The present invention relates to a kind of three-phase four-wire system zero line fault and phase shortage intelligent protection device, whether this device can detect zero line automatically and break down and handle at different failure situations, belongs to the power supply technique field.
Background technology
In the low-voltage power supply and distribution system of China town and country and industrial enterprise, most low-voltage power supply system that adopts the 380/220V three-phase four-wire system to use with, as shown in Figure 1.Can produce the single-phase load distribution in this hybrid-type three-phase four-wire low-voltage electric power system and distribute imbalance problem, the imbalance of voltage between phases will occur.And in the public power distribution room in city, most of load of distribution transformer is a single-phase load, even reaches more than 80%, and this certainly leads to alternate sharing of load imbalance problem.
The imbalance of load will be brought the imbalance of three-phase voltage because all pressures effect of zero line (PEN), threephase load power less than 30KW below, and during the resistance of zero line less (R0≤1 Ω), even threephase load imbalance, its every voltage be symmetry still, equal the power supply phase voltage respectively.
In three phase and four wire circuit system,, can cause that all circuit back segment voltage and three-phase four-wire system neutral point are offset as everyone knows when zero line breaks/faults such as breakage/phase shortage, thus the personal safety that jeopardizes back end of line power consumption equipment safety and electricity consumption personnel.After the zero line fault, because the degree of unbalance difference of threephase load power, institute causes that neutral point excursion voltage is also unequal; When degree of unbalance reaches certain value, its neutral point offset voltage more than 50V, with it Dui Ying threephase load phase voltage have greater than 270V, have less than 170V: i.e. each phase load voltage ascending, descending reaches more than 20% of rated value.
In order to guarantee power consumption equipment safety and personal safety, improve the security reliability of electricity consumption, prevent to cause that owing to zero line breaks down voltage jeopardizes safety on the circuit, the safe voltage of the IEC/TC64 of International Electrotechnical Commission " building electric device " standard code first section and JGJ/T16-2008 " civil buildings electrical design standard " have stipulated to require protection and the operate time after the zero line fault: (1) phase line nominal voltage over the ground is the earth fault protection of the TN system distribution line of 220V, the time in its disengagement failure loop should meet the following requirements: A. distribution line or only supply with the tail end line of fixed electric device electricity consumption, and should not be greater than 5s; B. hand held electric equipment and mobile electrical devices tail end line or receptacle loop are given in power supply, should be greater than 0.4s.(2) earth fault protection of hand held electric equipment, when single-phase earthing took place, the time of auto power off should not surpass 0.4s or touch voltage should not surpass 50V.(3) be applicable to that anti-electric shock protection is categorized as the electric equipment of I class, when the environment at equipment place was home, person electric shock safe voltage limit value (UL) was 50V.
At present, made big quantity research at zero line fault technical elements both at home and abroad.For the TN-C-S system, its basic skills mainly is after utilizing the protective earthing-neutral conductor broken string, and its load neutral point excursion voltage is to introduce the PE line by the branch junction of PEN and PE line, thereby causes the touch voltage to human body.In order to eliminate and to reduce offset voltage over the ground on the PE line, PEN and PE branch tie point are carried out ground connection, promptly the equipotential connection processing can avoid the electrical appliance shell to produce the harm of drift potential to the touch voltage of human body like this.Because this method has only solved the offset problem of voltage, but does not fundamentally solve the problem that faulty line also is in charged operating state,, might cause the generation of other accident so there is very big potential safety hazard.
Also there is the person to wait the capacitor of capacity to be connected into Y shape, forms an artificial mid point N, replace the working earthing of " voltage-type protector ", judge whether to take place the zero line fault then, yet because of being subjected to the influence of various factors, this method is still not fully up to expectations with three.
According to existing domestic, international standard regulation, the working earthing of middle cut-off protector sample circuit must be made independently earthing device, and is separately strict with the iterative earthing of protective earthing-neutral conductor, so that its working earthing is a zero potential, and is not subjected to the influence of other earthing potential.This just requires the natural grounding substance such as reinforcement foundation, buried metal pipeline of working earthing and iterative earthing and building to keep about 20 meters distance.This requires the independent ground electrode that not influenced by other ground connection is set for the residential block that high building stands in great numbers, underground piping gathers, and is difficult to really realize.So stopped using this voltage-type protector abroad in fact, domestic also because the zero potential of middle cut-off protector working earthing is difficult to not be subjected to the influence of other ground connection, and be difficult to normally promote the use of.
Based on above problem, the accident that this causes with regard to needs solution zero line fault with protection equipment and personal safety, makes the electric power system safe operation.
Though being arranged at present, many technology utilize network to monitor in real time, but for the 0.4kv distribution network terminal, implement very difficult, supply line's complexity, dispersion, circuit branch are many, quantity big, distance is distant, cause networking, communication difficulties, for the system of distribution supply line in a city, to each line terminal a very huge engineering with monitoring network cloth.
Summary of the invention
At the prior art above shortcomings, the purpose of this invention is to provide a kind of three-phase four-wire system zero line fault and phase shortage intelligent protection device of managing easy to implement, convenient.
Technical scheme of the present invention is achieved in that three-phase four-wire system zero line fault and phase shortage intelligent protection device, and it mainly is provided with module by current transformer, voltage transformer, quantum conversion module, data processing module, cpu logic controller, drive circuit, communication module and parameter and forms; Current transformer is used for the inductive power supply loop current signals, and current transformer output connects the quantum conversion module input; Voltage transformer is used for inductive power supply loop voltage signal, and voltage transformer output connects the quantum conversion module input; Quantum conversion module, data processing module, cpu logic controller and drive circuit are linked in sequence successively, the switch of drive circuit one tunnel output switch trip signal tape splicing switching winding, and another road output alarm signal connects the back-stage management center; The cpu logic controller is connected with telemanagement center or terminal by communication module, and the output that parameter is provided with module connects the input of cpu logic controller.
This device also comprises display, and the input of described display connects the output of cpu logic controller.
Whether the present invention can directly gather, analyzes, calculate and judge zero line and break down to data; and after taking place, fault sends the protection control signal; make switch trip; disengagement failure rear end power circuit; stop power supply; make the electric power system safe operation, thereby reach the purpose of protection equipment and personal safety.Send alarm signal (passive signal) simultaneously, be sent to the back-stage management machine and handle accordingly, realize the warning upload function, fault message can reduce interruption duration to the power outage suggestion of dealing with fast.
This device has remote management capability.Owing to had device to have only controlled function in the past, output signal also is the dry contact signalling contact, can not realize the data remote function, and this device has communication function, consensus standard, energy good and existing management system or newly-built management system compatibility by simple configuration, can realize the management of data definite value and other controlled function.
This device directly is loaded on line end or power distribution room leading-out terminal, can be used (switch need be with switching winding) with switch, and flexible for installation, easy to use, according to circumstances the scene is provided with parameter, and quantities is little, transforms all very suitable to newly-built distribution and old net.
Description of drawings
The low-voltage power supply system schematic diagram that Fig. 1-existing three-phase four-wire system is used with.
Fig. 2-structural representation of the present invention.
Fig. 3-workflow diagram of the present invention.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
Based on the deficiencies in the prior art; the present invention has designed a kind of three-phase four-wire system zero line fault and phase shortage intelligent protection device; device is by detection line three-phase voltage and three-phase current; the row operation of going forward side by side; as judge zero line and break down; then send the corresponding action signal, realize to the faulty line power operation protection equipment and personal safety.Also export the dry contact signal in the time of output signal, can insert other management system.By expansion intelligence communication module, can realize that online detection data in real time is uploaded to backstage or management system; In the mode of serial communication, reduce wiring and artificial installation cost simultaneously.
Its specific implementation is referring to Fig. 2; from the figure as can be seen; zero line fault of the present invention and phase shortage intelligent protection device, it mainly by current transformer, voltage transformer, quantum conversion module, data processing module, cpu logic controller, drive circuit, display, module is set parameter and power module is formed.The output of current transformer and voltage transformer connects the quantum conversion module input, quantum conversion module, data processing module, cpu logic controller and drive circuit are linked in sequence successively, the switch of drive circuit one tunnel output switch trip signal tape splicing switching winding, another road output alarm signal connects the back-stage management center.The output that parameter is provided with module connects the input of cpu logic controller simultaneously.The input of display connects the output of cpu logic controller.
In order to realize online function for monitoring and Long-distance Control and management function, this device cpu logic controller possesses communication port, the communication port of cpu logic controller is connected with telemanagement center or terminal by communication module, can realize the telemanagement of total data by communication mode.
The function introduction of each critical piece is as follows:
Current transformer: inductive power supply loop major loop primary current or secondary current signal also are transported to quantum conversion module.
Voltage transformer: inductive power supply loop major loop primary voltage or secondary voltage signal also are transported to quantum conversion module.
Quantum conversion module: can identified range to the information translation apparatus for converting that current transformer and voltage transformer are brought.
Data processing module: calculate triple line electric current and phase current, the voltage signal of sampling calculated all parameters of electric power such as side-play amount, active power, reactive power, apparent power, power factor of three-phase line voltage and phase voltage and neutral point voltage by current signal, and result of calculation is sent to the cpu logic controller to sampling.
The cpu logic controller: by the result of calculation of input, CPU carries out computing, comparison, judgement by the logic control program of writing, and calculates whether the zero line fault takes place then, in this way, then sends control command and gives switch, simultaneously output alarm signal.
Display: be used with the cpu logic controller, measurement, state show, the parameter setting.
Drive circuit: enlarge the capacity of control contact, the output contact Capacity Ratio of cpu logic controller is less, and signal directly removes control switch action and output alarm signal through the coil of relay by the contact of relay.
Parameter is provided with module (being keyboard): be used to be provided with parameter and display interface adjustment.
Communication module: communicate with external management system (telemanagement center or terminal), realize the output of parameter setting and state, can realize functions such as " remote signalling ", " remote measurement ", " remote control ".
Power module: be used for making the device operate as normal to each module for power supply.
Switch (band switching winding): the controlled device of this device, for electric power system itself from tape member, receive and carry out action after the trip command, cut off back-end circuit.
Motion flow of the present invention is introduced (see figure 3):
1, device initialize
(1) the equipment energising brings into operation.
(2) parameter setting: design current mutual inductor ratio, voltage transformer no-load voltage ratio, overvoltage operating value, low-voltage value, delay time, signal type, system time, mailing address and communication baud rate etc.
2, flow chart
(1) system's start that powers on;
(2) system initialization, System self-test is opened interruption;
(3) whether need device parameter as requested, parameter is set, parameter then is set as needs;
(4) if do not need device parameter then to enter the analog acquisition process, the data that collect are sent into internal storage location, for future use;
(5) regulate range ability, the analog signals that collects is converted to corresponding range;
(6) calculate line voltage, phase voltage, line current, phase current etc.;
(7) intelligence computation and judgement;
(8) if learn as calculated and break down and, send trip signal and alarm signal, forward (9) to according to the type that breaks down; Then do not return (3) if break down, repeat above process;
(9) shut down.
3, Interrupt Process
(1), enters interrupt routine according to interrupt vector.
(2) close the interruption inlet;
(3) interrupt handling routine is handled communication protocol and content;
(4) open the interruption inlet;
(5) interrupt routine returns.
The present invention also has other function:
1. can realize that 32 SOE logouts are detailed, the action date and time is arranged;
2. can realize under-voltage deferred action protection, the protection of under-voltage instantaneous operation, overvoltage deferred action protection, the protection of overvoltage instantaneous operation;
3. rights management is provided with different passwords and obtains different rights, guarantees equipment safety operation;
4. confirm operation, all operations all is provided with affirmation, prevents misoperation.
5. after parameter was provided with, fully-automatic intelligent calculated failure condition, need not manual intervention.
6. this device cooperates with alarm signal with the auxiliary contact of switch, according to different combinations, can judge it is the own retentivity action of switch fault, switch and zero line intelligent fault protection action and operate as normal.
7. multistage selective protection function: realize total road and branch road, the multistage cooperation function of judging the neutral line break protection respectively such as branch road and user, branch road should preferentially move, and prevents the expanded range of cutting off the power supply.
8. warning retransmission function: after this device is judged neutral line break, send corresponding signal driving switch tripping operation (passive signal) according to type, send an alarm signal (passive signal) simultaneously, being used to be sent to the back-stage management center handles accordingly, reach the function of reporting to the police and uploading, fault message can reduce interruption duration to the power outage suggestion of dealing with fast.
This zero line fault and phase shortage intelligent protection device are installed in line end or power distribution room leading-out terminal; device is gathered the three-phase current and the three-phase voltage of circuit in real time; carry out computing in real time; the potential shift of the zero line that calculates by sampled value and the protection operating value of setting are made comparisons; judge by the variation of actual measurement phase voltage whether zero line breaks/faults such as breakage/phase shortage simultaneously; send control signal corresponding, drive the protective device action, the safety of the protection circuit rear end equipment and the person.When equipment sends protection control signal the time, an alarm signal also is provided, be used for the backstage warning message in this loop is managed.
Claims (2)
1. three-phase four-wire system zero line fault and phase shortage intelligent protection device, it is characterized in that: it mainly is provided with module by current transformer, voltage transformer, quantum conversion module, data processing module, cpu logic controller, drive circuit, communication module and parameter and forms; Current transformer is used for the inductive power supply loop current signals, and current transformer output connects the quantum conversion module input; Voltage transformer is used for inductive power supply loop voltage signal, and voltage transformer output connects the quantum conversion module input; Quantum conversion module, data processing module, cpu logic controller and drive circuit are linked in sequence successively, the switch of drive circuit one tunnel output switch trip signal tape splicing switching winding, and another road output alarm signal connects the back-stage management center; The cpu logic controller is connected with telemanagement center or terminal by communication module, and the output that parameter is provided with module connects the input of cpu logic controller.
2. three-phase four-wire system zero line fault according to claim 1 and phase shortage intelligent protection device is characterized in that: this device also comprises display, and the input of described display connects the output of cpu logic controller.
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| CN 201010508092 CN101964516B (en) | 2010-10-15 | 2010-10-15 | Three-phase four-wire system zero-line failure and open-phase intelligent protector |
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| CN 201010508092 CN101964516B (en) | 2010-10-15 | 2010-10-15 | Three-phase four-wire system zero-line failure and open-phase intelligent protector |
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| CN101964516A true CN101964516A (en) | 2011-02-02 |
| CN101964516B CN101964516B (en) | 2013-04-24 |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102638024A (en) * | 2012-04-16 | 2012-08-15 | 北京航天发射技术研究所 | Neutral line break protector |
| CN103116087A (en) * | 2012-09-26 | 2013-05-22 | 珠海瑞特电气设备有限公司 | Electric power alternating current-direct current (AC/DC) power source crosstalk computer monitoring protective device |
| CN104659739A (en) * | 2015-02-06 | 2015-05-27 | 广东南冠电气有限公司 | Circuit breaker with neutral line fault default phase protection function |
| CN105448609A (en) * | 2015-11-19 | 2016-03-30 | 广东电网有限责任公司珠海供电局 | Voltage trip device |
| CN106405305A (en) * | 2015-07-30 | 2017-02-15 | 浙江正泰电器股份有限公司 | Zero line open-phase detection circuit and method for detecting open phase of zero line |
| CN106655140A (en) * | 2017-02-14 | 2017-05-10 | 国网新疆电力公司伊犁供电公司 | Zero line breakage detection protection device for low-voltage power distribution network |
| CN107069701A (en) * | 2016-12-07 | 2017-08-18 | 上海磊跃自动化设备有限公司 | 380V or 220V current supply circuit supervising devices |
| CN107681633A (en) * | 2017-11-21 | 2018-02-09 | 国网宁夏电力有限公司宁东供电公司 | voltage transformer secondary voltage intelligent protection device |
| CN109061394A (en) * | 2018-09-14 | 2018-12-21 | 国网江苏省电力有限公司镇江供电分公司 | Null line breaking alarm positioning device and method |
| CN105589008B (en) * | 2014-11-18 | 2019-02-19 | 德信东源电力技术服务（北京）有限公司 | Open phase fault detection method and device |
| CN110992636A (en) * | 2019-12-29 | 2020-04-10 | 杭州拓深科技有限公司 | Electrical fire early warning method |
| CN113093060A (en) * | 2021-04-13 | 2021-07-09 | 厦门理工学院 | Method, device and equipment for detecting zero line breakage of power distribution network |
| CN113671310A (en) * | 2021-07-14 | 2021-11-19 | 广西电网有限责任公司桂林供电局 | Alternating current system branch fault monitoring system and method |
| CN113740768A (en) * | 2021-07-22 | 2021-12-03 | 南方电网深圳数字电网研究院有限公司 | Zero line fault detection device, method, electronic equipment and storage medium |
| CN113777532A (en) * | 2021-11-10 | 2021-12-10 | 武汉中电国为技术有限公司 | System, method and device for recognizing zero-line and phase-loss of power secondary equipment side |
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Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102638024A (en) * | 2012-04-16 | 2012-08-15 | 北京航天发射技术研究所 | Neutral line break protector |
| CN103116087A (en) * | 2012-09-26 | 2013-05-22 | 珠海瑞特电气设备有限公司 | Electric power alternating current-direct current (AC/DC) power source crosstalk computer monitoring protective device |
| CN103116087B (en) * | 2012-09-26 | 2015-10-28 | 珠海瑞特电气设备有限公司 | Electric power power of alterating and direct current crosstalk microcomputer monitoring protective device |
| CN105589008B (en) * | 2014-11-18 | 2019-02-19 | 德信东源电力技术服务（北京）有限公司 | Open phase fault detection method and device |
| CN104659739A (en) * | 2015-02-06 | 2015-05-27 | 广东南冠电气有限公司 | Circuit breaker with neutral line fault default phase protection function |
| CN106405305A (en) * | 2015-07-30 | 2017-02-15 | 浙江正泰电器股份有限公司 | Zero line open-phase detection circuit and method for detecting open phase of zero line |
| CN106405305B (en) * | 2015-07-30 | 2024-02-27 | 浙江正泰电器股份有限公司 | Zero line phase failure detection circuit and method for detecting zero line phase failure |
| CN105448609A (en) * | 2015-11-19 | 2016-03-30 | 广东电网有限责任公司珠海供电局 | Voltage trip device |
| CN107069701A (en) * | 2016-12-07 | 2017-08-18 | 上海磊跃自动化设备有限公司 | 380V or 220V current supply circuit supervising devices |
| CN106655140A (en) * | 2017-02-14 | 2017-05-10 | 国网新疆电力公司伊犁供电公司 | Zero line breakage detection protection device for low-voltage power distribution network |
| CN107681633B (en) * | 2017-11-21 | 2023-07-14 | 国网宁夏电力有限公司宁东供电公司 | Intelligent secondary voltage protection device for voltage transformer |
| CN107681633A (en) * | 2017-11-21 | 2018-02-09 | 国网宁夏电力有限公司宁东供电公司 | voltage transformer secondary voltage intelligent protection device |
| CN109061394A (en) * | 2018-09-14 | 2018-12-21 | 国网江苏省电力有限公司镇江供电分公司 | Null line breaking alarm positioning device and method |
| CN109061394B (en) * | 2018-09-14 | 2023-10-13 | 国网江苏省电力有限公司镇江供电分公司 | Zero line breakage alarm positioning device and method for three-phase four-wire system power supply system |
| CN110992636A (en) * | 2019-12-29 | 2020-04-10 | 杭州拓深科技有限公司 | Electrical fire early warning method |
| CN113093060A (en) * | 2021-04-13 | 2021-07-09 | 厦门理工学院 | Method, device and equipment for detecting zero line breakage of power distribution network |
| CN113093060B (en) * | 2021-04-13 | 2022-05-20 | 厦门理工学院 | Method, device and equipment for detecting zero line breakage of power distribution network |
| CN113671310A (en) * | 2021-07-14 | 2021-11-19 | 广西电网有限责任公司桂林供电局 | Alternating current system branch fault monitoring system and method |
| CN113740768A (en) * | 2021-07-22 | 2021-12-03 | 南方电网深圳数字电网研究院有限公司 | Zero line fault detection device, method, electronic equipment and storage medium |
| CN113740768B (en) * | 2021-07-22 | 2024-05-14 | 南方电网数字平台科技(广东)有限公司 | Zero line fault detection device and method, electronic equipment and storage medium |
| CN113777532A (en) * | 2021-11-10 | 2021-12-10 | 武汉中电国为技术有限公司 | System, method and device for recognizing zero-line and phase-loss of power secondary equipment side |
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| CN101964516B (en) | 2013-04-24 |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 400014 Zhongshan Road, Yuzhong District, No. three, No. 21, No. Co-patentee after: Chongqing Sakura Energy Technology Co., Ltd. Patentee after: Chongqing City Electrical Power Co. Address before: 400014 Zhongshan Road, Yuzhong District, No. three, No. 21, No. Co-patentee before: Chongqing Yinghua Electric Switch Co., Ltd. Patentee before: Chongqing City Electrical Power Co. |