CN101588057A - Relay protection device - Google Patents
Relay protection device Download PDFInfo
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- CN101588057A CN101588057A CNA2008100378908A CN200810037890A CN101588057A CN 101588057 A CN101588057 A CN 101588057A CN A2008100378908 A CNA2008100378908 A CN A2008100378908A CN 200810037890 A CN200810037890 A CN 200810037890A CN 101588057 A CN101588057 A CN 101588057A
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Abstract
The invention relates to a relay protection device which is used for the relay protection to electrical power equipment. The relay protection device comprises a first body, a second body connected with the first body, n electronic transformers which are connected with an interface of the second body through shielding wires, wherein the electronic transformers are used for acquiring the voltage value or the current value of the electrical power equipment; and the second body comprises n surge protection units and n self-adapting units which are correspondingly connected with the surge protection units, wherein n is natural number. The invention has the advantages of reduced cost, simple design, safety, reliability as well as convenient operation and maintenance.
Description
Technical field
The present invention relates to a kind of device that is used for the electric power system relaying protection.
Background technology
Fast development along with electronic technology; in electric power system; usually can use microcomputer to realize the relaying protection of power equipment; for example; shown in Figure 1 is the general microcomputer protective relay device block diagram of prior art; comprise first body 1 '; n built-in instrument transformer 2 ' that is connected with first body 1 ' respectively; n traditional instrument transformer 3 ' that is connected with built-in instrument transformer 2 ' respectively by plain conductor; wherein traditional instrument transformer 3 ' comprises current transformer and voltage transformer 33 '; current transformer comprises the current measurement instrument transformer 32 ' that is used for current protection current in loop protection instrument transformer 31 ' and is used for current measurement circuit again, and n is a natural number.
Above-mentioned current transformer is several amperes when the nominal operation state, may surpass 100 amperes under nonserviceabling, and voltage transformer is generally hectovolt.The power that these electric current, voltage transformers provided is considerably beyond the needs of microprocessor in the present microcomputer protective relay device; therefore; present built-in instrument transformer 2 ' adopts small current, voltage transformer as the electric quantity acquisition element basically, uses general microcomputer protective relay device to have following characteristics:
1. must use have good linearty, less differ with the electric current of anti-saturation, voltage transformer as built-in instrument transformer.Present technological level can accomplish that 20 times of rated current are unsaturated, and phase difference can control to somewhat.Because the specification requirement height of these instrument transformers so have higher price, has increased the cost of product.
2. because high accuracy and anti-saturation are a pair of implacable contradiction to current transformer, therefore in protective device, measure the loop and protect the loop can adopt two kinds of instrument transformers respectively, this has increased production cost again.
3. traditional Current Transformer Secondary can not be opened a way, and voltage transformer secondary can not short circuit.Therefore the reliability of the current circuit of protective device must be guaranteed to insert, must when debugging, operating current loop, its phenomenon of not opening a way must be guaranteed simultaneously.Must seal in fuse with the protection voltage transformer at voltage transformer circuit.These all will reduce the reliability of whole protecting system, the cost that increases operation and safeguard.
4. because traditional instrument transformer method of attachment is more, the current/voltage loop connection that must cause receiving device is more, causes error easily, brings difficulty to debugging.
Summary of the invention
In order to overcome the deficiency that above-mentioned prior art exists, the present invention aims to provide a kind of protective relaying device, to realize reducing cost raising reliability, the purpose of adaptation development of new techniques.
A kind of protective relaying device of the present invention; be used for power equipment is carried out relaying protection; comprise first body; it is characterized in that: it also comprises second body and n the electric mutual inductor that is connected with the interface of described second body by shielding conductor respectively that is connected with described first body, wherein:
Electric mutual inductor is used to gather the magnitude of voltage or the current value of described power equipment;
Second body comprise n surge protection unit and n respectively with the adaptive unit of the corresponding connection in described surge protection unit, wherein:
The surge protection unit is used for eliminating the sharp cutting edge of a knife or a sword pulse of described electric mutual inductor output signal;
Adaptive unit is used for the scope of described surge protection element output signal is carried out corresponding configuration;
Wherein, n is a natural number.
In above-mentioned protective relaying device, described first body comprises the corresponding successively n that connects an anti-interference unit, a n filter unit, n AD converting unit and CPU, and n is a natural number, wherein:
Anti-interference unit, corresponding connection with described adaptive unit is used for eliminating the interference signal of described adaptive unit output signal;
Filter unit is used for eliminating the high frequency or the low frequency signal of described anti-interference element output signal;
The AD converting unit is used for the analog signal conversion of described filter unit output is become digital signal;
CPU is used to receive the digital signal from described AD converting unit output, calculates actual numerical value, and judges according to prerequisite, realizes the relaying protection function.
In above-mentioned protective relaying device, described central control unit comprises:
Computing module is used to receive the digital signal from described AD converting unit output, and calculates the actual charge value of output;
The function setting and the module of adjusting are used for receiving the extraneous signal of importing by man-machine interface, carry out the setting and the protection setting value of correlation function;
Memory module is connected with the described function setting and the module of adjusting, and is used to store the setting value from described function setting and the module of adjusting output;
Relatively reach logic judgment module, be connected with described computing module, memory module respectively, be used to receive charge value on the one hand from described computing module output, receive simultaneously from the setting value of described memory module output, described charge value and setting value are compared judgement, and output processing signals and shows signal; Be used to receive the switching value signal of extraneous input on the other hand, carry out logic determines, and export corresponding switching value signal.
In above-mentioned protective relaying device, described central control unit also has a communication interface, is used for the communication with host computer or miscellaneous equipment.
Owing to adopted above-mentioned technical solution; the novel electronic instrument transformer that the present invention adopts is the low-power instrument transformer; these analog quantitys of this electric mutual inductor output can be used for protection; also can be used for measuring; can be directly used in calculating, therefore have reduce cost, simplicity of design, safe and reliable, operation and advantage easy to maintenance.
Description of drawings
Fig. 1 is the block diagram of the general microcomputer protective relay device of prior art;
Fig. 2 is the block diagram of a kind of protective relaying device of the present invention;
Fig. 3 is the block diagram of central control unit in a kind of protective relaying device of the present invention.
Embodiment
The present invention is described in detail below in conjunction with accompanying drawing.
As shown in Figure 1; the present invention, promptly a kind of protective relaying device is used for power equipment is carried out relaying protection; comprise first body 1, second body 2 that is connected with first body 1 and n electric mutual inductor 3 that is connected with the interface (not shown) of second body 2 respectively by shielding conductor 4, wherein:
Electric mutual inductor 3 is used to gather the magnitude of voltage or the current value of described power equipment, can adopt the product of Shanghai MWB Mutual Inductor Co. Ltd. at present, but be not limited to this product;
Wherein, n is a natural number.
First body 1 among the present invention comprises the corresponding successively n that connects an anti-interference unit 11, a n filter unit 12, a n AD converting unit 13 and CPU 14, and n is a natural number, wherein:
As shown in Figure 3, CPU 14 comprises:
The function setting and the module 142 of adjusting are used for receiving the extraneous signal of importing by man-machine interface 140, and this signal is set by the user usually, as the protection of which type of needs, and the setting of the line correlation function of going forward side by side and protection setting value;
Relatively reach logic judgment module 144, be connected with computing module 141, memory module 143 respectively, be used to receive charge value on the one hand from computing module 141 outputs, receive simultaneously from the setting value of memory module 143 outputs, this charge value and setting value are compared judgement, and the output processing signals, for example send tripping operation or alarm signal; And the output shows signal, be used to show coherent signal or content; Be used to receive the switching value signal of extraneous input on the other hand, carry out logic determines, promptly judge the state of the power equipment relevant, and export corresponding switching value signal with this protective relaying device.
Electric mutual inductor 3 among the present invention comprises voltage electronic instrument transformer 31 in the voltage circuit and the current electrons instrument transformer 32 in the current circuit, wherein, the specified output of the secondary of voltage electronic instrument transformer 31 only is several volts, the output of the secondary of current electrons instrument transformer 32 only is several millivolts, and between linear zone also considerably beyond the small-sized instrument transformer of general current/voltage.
In sum, the present invention has following characteristics:
1. needn't use the small current voltage transformer, obviously reduce the cost of product.
Between the electric mutual inductor linear zone also considerably beyond general small-sized instrument transformer, can satisfy fully and measure and the needs of protection.Removed the designing requirement in two kinds of loops in the protective device from.
3. electric mutual inductor is the low-power instrument transformer, and the specified output of voltage transformer secondary only is several volts, and Current Transformer Secondary output only is several millivolts, has improved the fail safe of secondary circuit greatly.Convenient operation and maintenance.
4. the special purpose interface that uses electric mutual inductor to provide, transmission signals uses shielded type cable.The problem that does not have wiring error.The simplified system wiring increases reliability.
Below embodiment has been described in detail the present invention in conjunction with the accompanying drawings, and those skilled in the art can make the many variations example to the present invention according to the above description.Thereby some details among the embodiment should not constitute limitation of the invention, and the scope that the present invention will define with appended claims is as protection scope of the present invention.
Claims (4)
1. protective relaying device; be used for power equipment is carried out relaying protection; comprise first body, it is characterized in that: it also comprises second body and n the electric mutual inductor that is connected with the interface of described second body by shielding conductor respectively that is connected with described first body, wherein:
Electric mutual inductor is used to gather the magnitude of voltage or the current value of described power equipment;
Second body comprise n surge protection unit and n respectively with the adaptive unit of the corresponding connection in described surge protection unit, wherein:
The surge protection unit is used for eliminating the sharp cutting edge of a knife or a sword pulse of described electric mutual inductor output signal;
Adaptive unit is used for the scope of described surge protection element output signal is carried out corresponding configuration;
Wherein, n is a natural number.
2. protective relaying device according to claim 1 is characterized in that: described first body comprises the corresponding successively n that connects an anti-interference unit, a n filter unit, n AD converting unit and CPU, and n is a natural number, wherein:
Anti-interference unit, corresponding connection with described adaptive unit is used for eliminating the interference signal of described adaptive unit output signal;
Filter unit is used for eliminating the high frequency or the low frequency signal of described anti-interference element output signal;
The AD converting unit is used for the analog signal conversion of described filter unit output is become digital signal;
CPU is used to receive the digital signal from described AD converting unit output, calculates actual numerical value, and judges according to prerequisite, realizes the relaying protection function.
3. protective relaying device according to claim 2 is characterized in that: described central control unit comprises:
Computing module is used to receive the digital signal from described AD converting unit output, and calculates the actual charge value of output;
The function setting and the module of adjusting are used for receiving the extraneous signal of importing by man-machine interface, carry out the setting and the protection setting value of correlation function;
Memory module is connected with the described function setting and the module of adjusting, and is used to store the setting value from described function setting and the module of adjusting output;
Relatively reach logic judgment module, be connected with described computing module, memory module respectively, be used to receive charge value on the one hand from described computing module output, receive simultaneously from the setting value of described memory module output, described charge value and setting value are compared judgement, and output processing signals and shows signal; Be used to receive the switching value signal of extraneous input on the other hand, carry out logic determines, and export corresponding switching value signal.
4. according to claim 2 or 3 described protective relaying devices, it is characterized in that: described central control unit also has a communication interface, is used for the communication with host computer or miscellaneous equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100378908A CN101588057B (en) | 2008-05-22 | 2008-05-22 | Relay protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100378908A CN101588057B (en) | 2008-05-22 | 2008-05-22 | Relay protection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101588057A true CN101588057A (en) | 2009-11-25 |
| CN101588057B CN101588057B (en) | 2011-05-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100378908A Expired - Fee Related CN101588057B (en) | 2008-05-22 | 2008-05-22 | Relay protection device |
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| Country | Link |
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| CN (1) | CN101588057B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102998595A (en) * | 2012-12-14 | 2013-03-27 | 大连国通电气有限公司 | Cable uniform current detection device and method for achieving same |
| CN104391145A (en) * | 2014-12-03 | 2015-03-04 | 广东电网有限责任公司茂名供电局 | Online low voltage detection device for electric leakage and electric energy steal and implement method thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003070151A (en) * | 2001-08-27 | 2003-03-07 | Toshiba Corp | Protective relay |
| JP2003274636A (en) * | 2002-03-15 | 2003-09-26 | Omron Corp | Solid state relay |
| CN201204441Y (en) * | 2008-05-22 | 2009-03-04 | 上海继电器有限公司 | Protective-relay device for power equipment |
-
2008
- 2008-05-22 CN CN2008100378908A patent/CN101588057B/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102998595A (en) * | 2012-12-14 | 2013-03-27 | 大连国通电气有限公司 | Cable uniform current detection device and method for achieving same |
| CN104391145A (en) * | 2014-12-03 | 2015-03-04 | 广东电网有限责任公司茂名供电局 | Online low voltage detection device for electric leakage and electric energy steal and implement method thereof |
| CN104391145B (en) * | 2014-12-03 | 2016-05-11 | 广东电网有限责任公司茂名供电局 | Online low-voltage leakage power stealing testing arrangement and its implementation |
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| Publication number | Publication date |
|---|---|
| CN101588057B (en) | 2011-05-18 |
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| C14 | Grant of patent or utility model | ||
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Owner name: PEOPLE'S ELECTRICAL APPLIANCE FACTORY, SHANGHAI EL Free format text: FORMER OWNER: SHANGHAI RELAY CO., LTD. Effective date: 20130626 |
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Free format text: CORRECT: ADDRESS; FROM: 200072 PUTUO, SHANGHAI TO: 200072 ZHABEI, SHANGHAI |
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| TR01 | Transfer of patent right |
Effective date of registration: 20130626 Address after: 200072 No. 3015, Gonghe Road, Shanghai, Zhabei District Patentee after: People's Electrical Appliance Factory, Shanghai Electrical Appliance Co., Ltd. Address before: 200072 No. 949, Wanrong Road, Shanghai Patentee before: Shanghai Relay Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110518 Termination date: 20210522 |
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| CF01 | Termination of patent right due to non-payment of annual fee |