CN107782989B - Rapid joint debugging test method for three-terminal optical difference protection channel of line - Google Patents
Rapid joint debugging test method for three-terminal optical difference protection channel of line Download PDFInfo
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- CN107782989B CN107782989B CN201610726630.6A CN201610726630A CN107782989B CN 107782989 B CN107782989 B CN 107782989B CN 201610726630 A CN201610726630 A CN 201610726630A CN 107782989 B CN107782989 B CN 107782989B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/263—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of measured values
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Abstract
The invention relates to a quick joint debugging test method for three-terminal optical difference protection channels of a circuit, wherein two optical fiber channels M, N and a 110KV circuit T are respectively arranged at the three terminals; the method comprises the following steps: M-N channel optical fiber differential protection joint debugging; checking the drawing and the wiring of cables inside and outside the screen, preventing mistaken touch, and recording data; testing the performance of the optical fiber channel; testing the power of the light emitter; testing the light receiving sensitivity; testing the light receiving power; channel sampling test; differential protection tripping test; remote trip test: the steps and the method of the second M-T channel, the third N-M channel, the fourth N-T channel, the fifth T-N channel and the sixth T-M channel are the same as the step one. The method has the advantages of saving the power failure time of a power supply office through rapid joint adjustment, greatly shortening the construction time of photovoltaic power generation engineering and providing favorable guarantee for smooth production.
Description
Technical Field
The invention relates to a joint debugging test method of an optical difference protection channel, in particular to a rapid joint debugging test method of a circuit three-end optical difference protection channel.
Background
At present, two-end optical fiber differential is generally adopted, the basic principle of optical fiber split-phase current differential protection is that sampling data of each phase of current is transmitted to the opposite side in real time by means of an optical fiber channel, the current sampling data of the opposite side is received at the same time, and the two-side protection utilizes the local and opposite side current data to perform phase splitting and differential current calculation after synchronous processing.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a rapid joint debugging test method for a three-terminal optical difference protection channel of a circuit, efficiently, rapidly and accurately realizes a relay protection function, saves the completion time of a power supply bureau and an engineering project, and realizes an earlier project production plan.
In order to solve the technical problem, the invention is realized as follows:
a quick joint debugging test method for a three-terminal optical difference protection channel of a circuit is characterized by comprising the following steps: the three ends are respectively provided with two optical fiber channels M, N and a 110KV line T; the method comprises the following steps:
the method comprises the following steps: M-N channel optical fiber differential protection joint debugging;
(1) checking the drawing and the wiring of cables inside and outside the screen, preventing mistaken touch, and recording data;
(2) testing the performance of the optical fiber channel;
1) testing the power of the light emitter;
measuring the power of a light emitter of the protection device by using an optical power meter and a tail fiber, wherein the power is consistent with a nominal value on a channel plug-in, and the error is +/-3 dBm;
2) testing the light receiving sensitivity;
selecting the optical wavelength of the optical attenuator, wherein the optical wavelength is consistent with the wavelength of the protection device, slowly adjusting the attenuation of the optical attenuator to enable the optical wavelength to gradually increase from 0dBm to the error rate of the device and enable a channel abnormity warning relay to act, and then, returning the optical attenuator back to the channel abnormity warning to just recover; the error between the receiving sensitivity and the nominal value is not more than 3 dBm;
3) testing the light receiving power;
checking the receiving power of the optical fiber from the opposite side by using an optical power meter, checking the receiving margin and ensuring that the receiving power margin is more than 6 dB; the situation of overload or lower than minimum receiving sensitivity cannot occur;
receiving power-receiving sensitivity
(3) Channel sampling test;
confirming the CT transformation ratio on two sides of the channel, wherein the polarity of the CT points, adding three-phase symmetrical rated current into a current loop of the current loop, and checking whether a current sampling value of the current loop is correct or not; when three symmetrical rated currents are added into the current loop on the opposite side, whether the sampling value of the current on the opposite side in the device on the side is correct is checked;
respectively adding an A-phase 1A, B-phase 2A, C-phase 3A asymmetric three-phase current into a current loop of the current; when the A phase 1A, B phase 2A, C phase 3A asymmetric three-phase current is added into the current loop of the opposite side, the sampling value of the current of the opposite side in the device of the side is correct and the phase is checked;
(4) differential protection tripping test: the circuit breakers on the two sides are closed, and differential protection is put into operation;
(5) remote trip test:
1) the local side sends out a long jump command, and the opposite side receives the long jump command: correct;
2) the opposite side sends out a long jump command, and the side receives the long jump command: correct;
3) when the remote jump is controlled to be 0 by the side, the side circuit breaker is closed, and the differential is opened without starting; the side sends a remote tripping command, and the side breaker acts, and vice versa;
4) when the remote jump is controlled to be 1 by the side, the side circuit breaker is closed, and the differential is opened without starting; the local side sends a remote tripping command, and the opposite side breaker does not act; when the opposite side circuit breaker is closed and differential motion is started, the local side sends a remote tripping command, and the opposite side circuit breaker acts, and vice versa;
step two, the M-T channel optical fiber differential protection joint debugging is the same as the step one;
step three, the N-M channel optical fiber differential protection joint debugging is carried out, and the steps are the same as the step one;
step four, the N-T channel optical fiber differential protection joint debugging is carried out, and the steps are the same as the step one;
step five, the T-N channel optical fiber differential protection joint debugging is carried out, and the steps are the same as the step one;
and step six, performing T-M channel optical fiber differential protection joint debugging, wherein the steps are the same as the step one.
The rapid joint debugging test method for the circuit three-terminal optical difference protection channel is characterized by comprising the following steps of: when the power of the light emitter is tested in the first step, the wavelength of the selected optical power meter is consistent with the wavelength of the device; firstly, testing by using special tail fibers provided by manufacturers; before testing, whether the tail fiber head is clean or not should be checked; the connector is connected with the protection device and the optical power meter in a reliable contact manner; the measured emitter power should be the sum of the measured value and the attenuation of 0.3dBm for 2 connectors.
The rapid joint debugging test method for the circuit three-terminal optical difference protection channel is characterized by comprising the following steps of: in the first step, the receiving power margin in the optical receiving power test is 10 dB.
The invention has the beneficial effects that: the project is that two photovoltaic power stations are simultaneously connected into a 110KV power transmission line, so that three-end optical fiber differential protection is needed for line protection, and the special requirement is obvious. In order to meet the field requirement, a certain channel is allowed to exit the protection and continue to operate; when a channel exits, the communication state of the channel is not checked any more, and the protection becomes two-terminal differential. The logic of the two-terminal differential and the three-terminal differential is consistent, and only the AC quantity of the exiting channel is changed into 0 to participate in calculation. The best mode of the invention is three-terminal joint debugging, because two photovoltaic power stations share one 110KV power transmission line, the engineering cost and the construction cost of the power transmission line of the engineering outside line are greatly saved, the power failure time of a power supply bureau is saved by using the method for fast joint debugging, the construction time of the photovoltaic power generation engineering is greatly shortened, and the method provides favorable guarantee for smooth production.
Drawings
The invention is described in further detail below with reference to the following figures and embodiments:
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
As shown in fig. 1: a quick joint debugging test method for three-terminal optical difference protection channels of a circuit is disclosed, wherein two optical fiber channels M, N and a 110KV circuit T are respectively arranged at the three terminals; in the figure, PRS-753DT is the model of the relay protection device; the method comprises the following steps:
the method comprises the following steps: M-N channel optical fiber differential protection joint debugging;
(1) checking the drawing and the wiring of cables inside and outside the screen, preventing mistaken touch, and recording data; the suggested records table is as follows:
| serial number | Access/tear down | Executive man | Loop numbering | Recovery | Executive man |
| 1 | Fiber termination box B11 | N-side to M-side optical differential protection | |||
| 2 | Fiber termination box B12 | N-side to M-side optical differential protection | |||
| 3 | Fiber optic termination box D11 | N-side to M-side optical differential protection | |||
| 4 | Fiber optic termination box D12 | N-side to M-side optical differential protection | |||
| 5 | Ac current terminal block 1ID1 | Current terminal number of N-side light difference protection device | |||
| 6 | Ac current terminal block 1ID2 | Current terminal number of N-side light difference protection device | |||
| 7 | Ac current terminal block 1ID3 | Current terminal number of N-side light difference protection device | |||
| 8 | Ac current terminal block 1ID4 | Current terminal number of N-side light difference protection device |
(2) Testing the performance of the optical fiber channel;
1) testing the power of the light emitter;
measuring the power of a light emitter of the protection device by using an optical power meter and a tail fiber, wherein the power is consistent with a nominal value on a channel plug-in, and the error is +/-3 dBm;
when the illuminator power is tested, the optical wavelength of the selected optical power meter is consistent with the wavelength of the device; firstly, testing by using special tail fibers provided by manufacturers; before testing, whether the tail fiber head is clean or not should be checked; the connector is connected with the protection device and the optical power meter in a reliable contact manner; the measured emitter power should be the sum of the measured value and the attenuation of 0.3dBm for 2 connectors;
2) testing the light receiving sensitivity;
selecting the optical wavelength of the optical attenuator, wherein the optical wavelength is consistent with the wavelength of the protection device, slowly adjusting the attenuation of the optical attenuator to enable the optical wavelength to gradually increase from 0dBm to the error rate of the device and enable a channel abnormity warning relay to act, and then, returning the optical attenuator back to the channel abnormity warning to just recover; the error between the receiving sensitivity and the nominal value is not more than 3 dBm;
3) testing the light receiving power;
checking the receiving power of the optical fiber from the opposite side by using an optical power meter, checking the receiving margin, and ensuring that the receiving power margin is more than 6dB, preferably 10 dB; the situation of overload or lower than minimum receiving sensitivity cannot occur;
receiving power-receiving sensitivity
(3) Channel sampling test;
confirming the transformation ratio of the CT (current transformer) on two sides of the channel, enabling the polarity of the CT to point, adding three-phase symmetrical rated current into a current loop of the current loop, and checking whether a current sampling value of the current loop is correct or not; when three symmetrical rated currents are added into a current loop on the opposite side, whether the sampling value of the current on the opposite side in the device on the opposite side is correct is checked, the data is recorded, and a recording table is suggested as follows:
respectively adding an A-phase 1A, B-phase 2A, C-phase 3A asymmetric three-phase current into a current loop of the current; when the opposite side adds the A phase 1A, B phase 2A, C phase 3A asymmetric three-phase current in the current loop respectively, the opposite side current sampling value in the device of the side is correct and phase checking is carried out, and data are recorded, the suggested table is as follows:
(4) differential protection tripping test: the circuit breakers on the two sides are closed and differential protection is put into operation, and the following table can be referred to:
(5) remote trip test:
1) the local side sends out a long jump command, and the opposite side receives the long jump command: correct;
2) the opposite side sends out a long jump command, and the side receives the long jump command: correct;
3) when the remote jump is controlled to be 0 by the side, the side circuit breaker is closed, and the differential is opened without starting; the side sends a remote tripping command, and the side breaker acts, and vice versa;
4) when the remote jump is controlled to be 1 by the side, the side circuit breaker is closed, and the differential is opened without starting; the local side sends a remote tripping command, and the opposite side breaker does not act; when the opposite side circuit breaker is closed and differential motion is started, the local side sends a remote tripping command, and the opposite side circuit breaker acts, and vice versa;
step two, the M-T channel optical fiber differential protection joint debugging is the same as the step one;
step three, the N-M channel optical fiber differential protection joint debugging is carried out, and the steps are the same as the step one;
step four, the N-T channel optical fiber differential protection joint debugging is carried out, and the steps are the same as the step one;
step five, the T-N channel optical fiber differential protection joint debugging is carried out, and the steps are the same as the step one;
and step six, performing T-M channel optical fiber differential protection joint debugging, wherein the steps are the same as the step one.
Claims (3)
1. A quick joint debugging test method for a three-terminal optical difference protection channel of a circuit is characterized by comprising the following steps: the three ends are respectively provided with two optical fiber channels M, N and a 110KV line T; the method comprises the following steps:
the method comprises the following steps: M-N channel optical fiber differential protection joint debugging;
(1) checking the drawing and the wiring of cables inside and outside the screen, preventing mistaken touch, and recording data;
(2) testing the performance of the optical fiber channel;
1) testing the power of the light emitter;
measuring the power of a light emitter of the protection device by using an optical power meter and a tail fiber, wherein the power is consistent with a nominal value on a channel plug-in, and the error is +/-3 dBm;
2) testing the light receiving sensitivity;
selecting the optical wavelength of the optical attenuator, wherein the optical wavelength is consistent with the wavelength of the protection device, slowly adjusting the attenuation of the optical attenuator to enable the optical wavelength to gradually increase from 0dBm to the error rate of the device and enable a channel abnormity warning relay to act, and then, returning the optical attenuator back to the channel abnormity warning to just recover; the error between the receiving sensitivity and the nominal value is not more than 3 dBm;
3) testing the light receiving power;
checking the receiving power of the optical fiber from the opposite side by using an optical power meter, checking the receiving margin and ensuring that the receiving power margin is more than 6 dB; the situation of overload or lower than minimum receiving sensitivity cannot occur;
power margin = reception power-reception sensitivity
(3) Channel sampling test;
confirming the CT transformation ratio on two sides of the channel, wherein the polarity of the CT points, adding three-phase symmetrical rated current into a current loop of the current loop, and checking whether a current sampling value of the current loop is correct or not; when three symmetrical rated currents are added into the current loop on the opposite side, whether the sampling value of the current on the opposite side in the device on the side is correct is checked;
respectively adding an A-phase 1A, B-phase 2A, C-phase 3A asymmetric three-phase current into a current loop of the current loop; when the A phase 1A, B phase 2A, C phase 3A asymmetric three-phase current is added into the current loop of the opposite side, whether the sampling value of the current of the opposite side in the device of the side is correct or not is checked, and the phase is checked;
(4) differential protection tripping test: the circuit breakers on the two sides are closed, and differential protection is put into operation;
(5) remote trip test:
1) the local side sends out a long jump command, and the opposite side receives the long jump command: correct;
2) the opposite side sends out a long jump command, and the side receives the long jump command: correct;
3) when the remote jump is controlled to be 0 by the side, the side circuit breaker is closed, and the differential is opened without starting; the side sends a remote tripping command, and the side breaker acts, and vice versa;
4) when the remote jump is controlled to be 1 by the side, the side circuit breaker is closed, and the differential is opened without starting; the local side sends a remote tripping command, and the opposite side breaker does not act; when the opposite side circuit breaker is closed and differential motion is started, the local side sends a remote tripping command, and the opposite side circuit breaker acts, and vice versa;
step two, the M-T channel optical fiber differential protection joint debugging is the same as the step one;
step three, the N-M channel optical fiber differential protection joint debugging is carried out, and the steps are the same as the step one;
step four, the N-T channel optical fiber differential protection joint debugging is carried out, and the steps are the same as the step one;
step five, the T-N channel optical fiber differential protection joint debugging is carried out, and the steps are the same as the step one;
and step six, performing T-M channel optical fiber differential protection joint debugging, wherein the steps are the same as the step one.
2. The line three-terminal optical difference protection channel fast joint debugging test method according to claim 1, characterized in that: when the power of the light emitter is tested in the first step, the wavelength of the selected optical power meter is consistent with the wavelength of the device; firstly, testing by using special tail fibers provided by manufacturers; before testing, whether the tail fiber head is clean or not should be checked; the connector is connected with the protection device and the optical power meter in a reliable contact manner; the measured emitter power should be the sum of the measured value and the attenuation of 0.3dBm for 2 connectors.
3. The line three-terminal optical difference protection channel fast joint debugging test method according to claim 1, characterized in that: in the first step, the receiving power margin in the optical receiving power test is 10 dB.
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| CN113391098B (en) * | 2021-06-15 | 2023-04-07 | 贵州电网有限责任公司 | Optical difference protection coaxial cable channel control device and control method thereof |
| CN114509616B (en) * | 2021-08-26 | 2023-07-14 | 国网河北省电力有限公司石家庄供电分公司 | Power failure analysis household problem investigation method |
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| CN102721882A (en) * | 2012-06-18 | 2012-10-10 | 辽宁省电力有限公司营口供电公司 | Intelligent and conventional transformer substation optical fiber longitudinal difference protection channel joint debugging test method |
| CN104242261A (en) * | 2014-08-27 | 2014-12-24 | 国家电网公司 | Control method for switching on and off of differential protection function of T-joint electric transmission line |
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2016
- 2016-08-26 CN CN201610726630.6A patent/CN107782989B/en active Active
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| CN101075753A (en) * | 2007-05-18 | 2007-11-21 | 南京力导科技股份有限公司 | Method for sampling and processing transmission data with transmission line optical-fiber longitudinal difference protection |
| CN101677183A (en) * | 2008-09-16 | 2010-03-24 | 河南省电力公司许昌供电公司 | Self-adaptive master-slave positioning method for three-terminal differential protection |
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