CN201274477Y - Detection apparatus for optical fiber longitudinal differential protection - Google Patents
Detection apparatus for optical fiber longitudinal differential protection Download PDFInfo
- Publication number
- CN201274477Y CN201274477Y CNU2008201914895U CN200820191489U CN201274477Y CN 201274477 Y CN201274477 Y CN 201274477Y CN U2008201914895 U CNU2008201914895 U CN U2008201914895U CN 200820191489 U CN200820191489 U CN 200820191489U CN 201274477 Y CN201274477 Y CN 201274477Y
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Abstract
The utility model relates to an optical-fiber longitudinal differential protection and detection device, consisting of an optical signal receiver unit and an optical signal transmitter unit. The optical signal receiver unit includes an optical-fiber receiver and a receiver demodulation circuit. The input end of the optical-fiber receiver is connected with an optical signal transmitting end of a relay protection device through optical fiber. The output end of the optical-fiber receiver is connected with the receiver demodulation circuit. The optical signal transmitter unit consists of a main vibration frequency division circuit, a transmitter modulation circuit, a frequency shift control circuit and an optical source; wherein, the main vibration frequency division circuit and the transmitter modulation circuit are connected with the input end of the frequency shift control circuit; the output end of the frequency shift control circuit is connected with the control end of the optical source; and the output end of the optical source is connected with the optical signal receiving end of the relay protection device through optical fiber. The utility model obtains the goals of detecting the optical signal receiving sensitivity of the relay protection devices at the both sides, tuning the tolerance and conducting the united attenuation test in the same station and overcoming the defects in the current simple method of using short-connected tail fiber to transmit and receive signals.
Description
Technical field
The utility model belongs to a kind of optical fiber detector, particularly a kind of optical-fiber longitudinal difference protection checkout gear.
Background technology
Fiber optic protection is the main protection of supertension line, and important effect is played in the safe and reliable safety to electric power system of passage, stable operation.Comprehensive all kinds of fault is out of service mainly due to the bad fiber optic protection that causes of construction technology; its problem is: a) the breakpoint welding is of low quality; make near the fiber core of breakpoint be subjected to the effect of stress, cause optical fiber attenuation index instability, influence fiber optic protection and normally move.B) optical fiber articulation dust stratification and owing to all kinds of faults make the welding of breakpoint too much cause the passage attenuation to increase, and cause the protective device channel alarm, cause fiber optic protection out of service.
The vertical difference of relaying protection device is used fibre circuit and is connected; but because human failure or natural disaster accident; often damage the fiber optic cables circuit; when recovering the debugging of fibre circuit and fiber optic protection; sit in the right seat for guaranteeing fibre circuit; accurate, must satisfy the optical-fiber longitudinal difference protection debugging and detect requirement, guarantee the operation of the vertical difference of relaying protection safe and stable arrangement.
At present, though the patent of aspects such as optical-fiber line fault, optical fibre channel detection, optical-fiber longitudinal difference protection is arranged.General employing tail optical fiber short circuit sends and receives (Fig. 1) when protective relaying device is debugged; optical-fibre channel and protective device are whole to be connected and both sides (are this side and offside but exist; manage this side as power plant, power department management offside) uniting and adjustment, the inconvenience profit of on-the-spot actual condition such as inspection.In the relaying protection debugging, when either side is done the bilateral united test, debug with two cover protective relaying devices; Especially at smelter, the production scene inclement condition, the inspection time is tighter, and influence surface is big, belongs under the specified conditions making that above-mentioned detection mode is more inconvenient.
Summary of the invention
The purpose of this utility model provides a kind of optical-fiber longitudinal difference protection checkout gear that just can detect both sides protective relaying device adjustment test in the same side, to overcome above-mentioned deficiency.
To achieve these goals, the utility model is made of the circuit in shell and the shell, its circuit is made of light signal receiving element and light signal transmitter unit, be characterized in: the light signal receiving element is made of fiber optic receiver and receiving demodulation circuit, the input of fiber optic receiver links to each other with the light signal transmitting terminal of protective relaying device by optical fiber, and the output and the receiving demodulation circuit of fiber optic receiver join; The light signal transmitter unit is made of main shaking-frequency dividing circuit, transmission modulation circuit, shift frequency control circuit and light source; wherein main shaking-frequency dividing circuit links to each other with shift frequency control circuit input respectively with the transmission modulation circuit; the control end of shift frequency control circuit output and light source joins, and the output of light source is connected with the light signal receiving terminal of protective relaying device by optical fiber.
Above-mentioned shell is provided with light-receiving indication green light, light power meter table, light emission red light and light and launches adjustable device, wherein light-receiving indication green light links to each other with receiving demodulation circuit in the light signal receiving element, light emission red light and light launch that the shift frequency control circuit joins in adjustable device and the light signal transmitter unit, the light power meter table respectively with the light signal receiving element in receiving demodulation circuit be connected with shift frequency control circuit in the light signal transmitter unit.
The utility model has overcome the overlong time that the check of prior art field adjustable, detection failure exist; problems such as condition imperfection; realized that the optical-fiber longitudinal difference protection bug check meets the rules requirement, satisfied production scene real work situation, thereby improved the security reliability of protective relaying device.The utility model is the detection fiber passage accurately; and judge whether the communication of sending and receiving letter is working properly; detect the both sides protective relaying device simultaneously, light signal receiving sensitivity, nargin are adjusted and the united test of attenuation, satisfy the optical-fiber longitudinal difference protection debugging and detect requirement.The utility model testing result is accurate, directly perceived, flexible and convenient operation.
Description of drawings
Fig. 1 is an existing fiber longitudinal difference protection checkout gear theory diagram.
Fig. 2 is the utility model theory diagram.
Fig. 3 is the utility model shell layout plan.
Embodiment
Below in conjunction with accompanying drawing the utility model is described in further detail.
The utility model (Fig. 1) comprises light signal receiving element and light signal transmitter unit, and the principle of light signal receiving element is: light signal becomes the signal of telecommunication after receiving, and through amplifying rectification, carries out incoming level and differentiates, and modulating pulse wave is exported on another road after shaping; Both the signal of relevant pulse mode was reduced into the corresponding protection signal form by receiving demodulation; The principle of light signal transmitter unit is: the guard signal (analog current signal or trip signal signal) of required transmission is transformed into the pulse singaling that can adopt the optical-fibre channel transmission, and modulation system is that pulse-code modulation (PCM), light source are LED.The crystal master oscillator frequenc that sends is XXKHz, output two class frequencys behind the frequency division: low frequency and high-frequency; When normally not transmitting order, low-frequency signals is through amplifying rear drive LED, the light pulse signal of output low frequency rate, and this moment, low-frequency signals was equivalent to monitored signal (fG); When the order input is arranged, forbid low-frequency signals output, switch to high-frequency signal, amplify rear drive LED, high-frequency signal is equivalent to order frequency (f
T), the power output of optical fiber is relevant with the size of current that flows through LED, changes the size of electric current among the LED, can change luminous power.
The utility model is provided with indicator light on shell, the normal green light of collection of letters fibre circuit communication is bright, and the normal red light of fibre circuit communication of posting a letter is bright, and the light power meter table shows power, launches the size that adjustable device is used for regulating the light source led electric current.
The utility model if this side device from ring test, only needs optical fiber is inserted this side, just can detect receiving sensitivity, nargin and the attenuation of the utility model and optical fiber enamel dish when using.Detect this side and the test of offside device loopback detection if desired,, only need the optical fiber access of offside is of the present utility model to side, just can detect sending and receiving both sides fibre circuit passage light signal receiving sensitivity, nargin and attenuation respectively.When the utility model detects optical cable and optical fibres damage recovery in provisional maintenance, also can take the loopback interlock to detect test connection, detection fiber line channel attenuation and receiving margin.
The utility model realized at same station detect both sides protective relaying device light signal receiving sensitivity, nargin is adjusted and the united test of attenuation, has overcome the defective of the existing letter leakage method that sends and receive with the tail optical fiber short circuit.The utility model need not peripheral auxiliary equipment, and cost is low, and is simple in structure, and debugging is convenient, and is reliable, satisfies the requirement of production scene relaying protection inspection fast, and effect is obvious, and economic benefit is outstanding.
The content that is not described in detail in this specification belongs to this area professional and technical personnel's known prior art.
Claims (2)
1, a kind of optical-fiber longitudinal difference protection checkout gear, constitute by the circuit in shell and the shell, its circuit is made of light signal receiving element and light signal transmitter unit, it is characterized in that: the light signal receiving element is made of fiber optic receiver and receiving demodulation circuit, the input of fiber optic receiver links to each other with the light signal transmitting terminal of protective relaying device by optical fiber, and the output and the receiving demodulation circuit of fiber optic receiver join; The light signal transmitter unit is made of main shaking-frequency dividing circuit, transmission modulation circuit, shift frequency control circuit and light source; wherein main shaking-frequency dividing circuit links to each other with shift frequency control circuit input respectively with the transmission modulation circuit; the control end of shift frequency control circuit output and light source joins, and the output of light source is connected with the light signal receiving terminal of protective relaying device by optical fiber.
2, optical-fiber longitudinal difference protection checkout gear as claimed in claim 1; it is characterized in that: shell is provided with light-receiving indication green light, light power meter table, light emission red light and light and launches adjustable device; wherein light-receiving indication green light links to each other with receiving demodulation circuit in the light signal receiving element; light emission red light and light launch that the shift frequency control circuit joins in adjustable device and the light signal transmitter unit, the light power meter table respectively with the light signal receiving element in receiving demodulation circuit be connected with shift frequency control circuit in the light signal transmitter unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201914895U CN201274477Y (en) | 2008-10-17 | 2008-10-17 | Detection apparatus for optical fiber longitudinal differential protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201914895U CN201274477Y (en) | 2008-10-17 | 2008-10-17 | Detection apparatus for optical fiber longitudinal differential protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201274477Y true CN201274477Y (en) | 2009-07-15 |
Family
ID=40884816
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201914895U Expired - Fee Related CN201274477Y (en) | 2008-10-17 | 2008-10-17 | Detection apparatus for optical fiber longitudinal differential protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201274477Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102819947A (en) * | 2011-06-10 | 2012-12-12 | 辽宁省电力有限公司大连供电公司 | LED and multimode fiber remote signaling signal acquisition device |
| CN102832702A (en) * | 2011-06-10 | 2012-12-19 | 辽宁省电力有限公司大连供电公司 | Laser-single mode fiber remote signaling signal sampling device |
| CN104267276A (en) * | 2014-09-23 | 2015-01-07 | 中冶天工上海十三冶建设有限公司 | Method for inspecting high-voltage motor longitudinal differential protection by means of low-voltage locked-rotor currents |
-
2008
- 2008-10-17 CN CNU2008201914895U patent/CN201274477Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102819947A (en) * | 2011-06-10 | 2012-12-12 | 辽宁省电力有限公司大连供电公司 | LED and multimode fiber remote signaling signal acquisition device |
| CN102832702A (en) * | 2011-06-10 | 2012-12-19 | 辽宁省电力有限公司大连供电公司 | Laser-single mode fiber remote signaling signal sampling device |
| CN104267276A (en) * | 2014-09-23 | 2015-01-07 | 中冶天工上海十三冶建设有限公司 | Method for inspecting high-voltage motor longitudinal differential protection by means of low-voltage locked-rotor currents |
| CN104267276B (en) * | 2014-09-23 | 2017-03-29 | 中冶天工上海十三冶建设有限公司 | Method high-tension motor longitudinal differential protection checked with low pressure locked rotor current |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090715 Termination date: 20141017 |
|
| EXPY | Termination of patent right or utility model |