CN111711174B - Relay protection method for multi-stage switching station series connection traction network - Google Patents
Relay protection method for multi-stage switching station series connection traction network Download PDFInfo
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- CN111711174B CN111711174B CN201911139724.3A CN201911139724A CN111711174B CN 111711174 B CN111711174 B CN 111711174B CN 201911139724 A CN201911139724 A CN 201911139724A CN 111711174 B CN111711174 B CN 111711174B
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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
- H02H7/262—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 switching or blocking orders
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Abstract
The invention discloses a relay protection method for a traction network connected in series in a multi-stage switching station, wherein the traction network is powered by a traction substation and an n-stage switching station in series, and circuit breakers are arranged on a feeder line of the traction substation, an incoming line and a feeder line of each stage of switching station; respectively carrying out protection setting calculation on a substation feeder line, a switching station incoming line, a front n-1-level switching station feeder line and an nth-level switching station feeder line; and then the configuration is protected according to the corresponding calculation result. The invention can reduce the protection level and shorten the trip time; has the characteristics of low cost, simple and convenient realization and the like.
Description
Technical Field
The invention belongs to the field of power supply protection of a power grid, and particularly relates to a relay protection method for a multi-stage switching station series connection traction network.
Background
In railway junction areas, large stations and railway branch lead-in places, because of more power supply units, in order to improve the flexibility and reliability of power supply, an expansion feeder line of a switching station is usually required to be arranged for supplying power, so that the structure of a traction network is gradually complicated, the number of relay protection matching stages is increased, and the protection speed is not easy to meet.
For protection of a multi-stage switching station series traction network, in current engineering application, circuit breakers are mainly arranged at a traction substation feeder line, a switching station inlet line and a feeder line at each stage respectively to perform multi-stage complex protection coordination, and faults cannot be removed as quickly as possible in order to meet the selectivity of actions among the protections; similarly, because the protection coordination is complex, the phenomenon of override trip caused by improper protection coordination can occur in the engineering, the power failure range is enlarged, and the on-site transportation order is greatly influenced.
At present, the research on relay protection methods of a multi-stage switching station series traction network can be repeated, only a student optimizes the protection quick-action performance by shortening the protection action delay, and research and analysis are not performed on the aspect of protection configuration.
Disclosure of Invention
In order to better solve the problems of multiple protection stages, long trip time and the like of a multi-stage switching station in the current engineering application, the invention provides a relay protection method of a traction network connected in series with the multi-stage switching station.
The invention relates to a relay protection method for a traction network connected in series with a multi-stage switching station, wherein the traction network is powered by a traction substation and an n-stage switching station in series, and circuit breakers are arranged on a feeder line of the traction substation, an incoming line and a feeder line of each stage of switching station; respectively carrying out protection setting calculation on a substation feeder line, a switching station incoming line, a front n-1-level switching station feeder line and an nth-level switching station feeder line; and then the protection configuration is calculated according to the corresponding calculation result.
The feeder protection configuration of the substation is distance I section, distance II section, distance III section, current quick break, low-voltage starting overcurrent, current increment and reclosing;
the switching station inlet line comprises single inlet line operation and double inlet line parallel connection, and the single inlet line operation protection configuration is voltage-loss automatic switching; the double-inlet-wire parallel protection configuration is a distance I section and a detected voltage reclosing switch;
The front n-1-level switching station feeder line protection is configured into a distance I section, a distance II section, a current quick-break, a low-voltage starting overcurrent, a current increment and a reclosing switch;
the nth stage switching station feeder line protection is configured to be a distance I section, a distance II section, low-voltage starting overcurrent, current increment and reclosing.
The protection setting calculation of the distance I section is as follows:
the reactance constant value calculation formula is as follows:
in the formula: kkFor a reliable coefficient, 0.85 is taken when a substation feeder line and a front n-1-level switching station feeder line are subjected to setting calculation, and 1.5 is taken when a switching station inlet line and an nth-level switching station feeder line are subjected to calculation; l is0For length of supply line, x0Is a unit reactance of the power supply line, L1Is the length of the contact net, x1Is the unit reactance of the contact network, nCTFor current transformer transformation ratio, nPTThe transformation ratio of the voltage transformer is obtained.
The resistance constant value calculation formula is as follows:
in the formula: kkIs a reliable coefficient, the value is 1.2, UminIs the lowest operating voltage of the substation or switching station, Ifh.maxIs the maximum load current of the feeder line,
in order to be the load impedance angle,
is the line impedance angle.
The operation time was set to 0.1 s.
The distance II section protection setting calculation of the feeder line of the substation is as follows:
the reactance constant value calculation formula is as follows:
in the formula: kkThe reliability coefficient is 0.85, K fThe current splitting coefficient is adopted, the single inlet wire operation of the switching station is 1, and the double inlet wire parallel connection is 2; l is2The value of (a) is the length of the contact network of the shortest line in the 1-stage switching station, x2Is a 1-level switching station contact net unit reactance;
the resistance constant value is the same as the resistance constant value of the distance I section;
the action time limit is matched with the time limit of the distance I section of the feeder line of the 1-level switching station, and the action time limit is defined as the time limit of the distance I section of the feeder line of the 1-level switching station plus the time delay delta T;
the feeder protection setting calculation of the first n-1-stage switching station is as follows:
in the formula: kkThe reliability coefficient is 1.5; kfThe current splitting coefficient is adopted, the single incoming line operation of the next stage switching station is 1, and the double incoming lines are connected in parallel to be 2; l is2The value of (A) is the length value of the contact network of the longest line in the next stage switching station;
the resistance constant value is the same as the resistance constant value of the section I.
The action time limit is matched with the time limit of the distance I section of the feeder line of the next-stage switching station, and the action time limit is set by adding the time limit of the distance I section of the feeder line of the next-stage switching station with the time delay delta T;
the distance II section of the nth stage switching station feeder line is only set for the compound line traction network, and the protection setting calculation is as follows:
the reactance constant value setting formula is as follows:
in the formula: kkTaking 1.2 as a reliable coefficient;
the resistance constant value is the same as the resistance constant value of the section I.
The action time limit is matched with the time limit of the section I away from the subarea, and the action time limit is set by adding the time limit of the section I away from the subarea with the time delay delta T;
The protection setting calculation of the distance III section is as follows:
the reactance constant value calculation formula is as follows:
in the formula: kkFor reliability factor, take 1.2, L3Length of contact net of longest line in 1-stage switching station, x3Is the unit reactance of the contact network of the switching station.
The resistance constant value is the same as the resistance constant value of the section I.
The action time limit is set to be the time limit of the distance II section plus delta T.
The current quick-break protection setting calculation is as follows:
the action current setting formula is as follows:
in the formula: k iskTaking 1.2 as a reliable coefficient; i isd.maxThe maximum short-circuit current flowing through a substation or a substation feeder circuit breaker when a fault occurs at a substation feeder outlet is switched.
And (4) checking the sensitivity according to the maximum short-circuit current at the feeder circuit breaker of the substation or the stage, which is shown in a formula (6).
In the formula: i isd.b.maxThe maximum short circuit current of a fault at a feeder circuit breaker of a substation is switched for the substation or this stage.
If the sensitivity is not satisfied, the current is not applied to be quickly cut off.
The operation time was set to 0.1 s.
The low-voltage starting overcurrent protection setting calculation is as follows:
the action voltage setting formula is as follows:
in the formula: u shapeminIs the lowest operating voltage, K, of a substation or a local substationkFor the reliability factor, 1.2 was taken.
The action current setting formula is as follows:
in the formula: kkTo be secured Counting, taking 1.2; k islmFor sensitivity coefficient, take 1.2, Ifh.maxFor the maximum load current of the feeder, Id.minThe minimum short-circuit current is the minimum short-circuit current flowing through the protection installation of the substation when the tail end of the line fails in a single line or when the subarea station fails in a compound line.
And (3) action time limit: the action time limit is the same between the substation and the distance III section; the action time limit of the front n-1 stage switching station and the distance II section is the same; in the nth stage switching station, the single line has the same action time limit as the distance I section, and the multiple line has the same action time limit as the distance II section.
The current increment protection setting calculation is as follows:
the action current setting formula is as follows:
in the formula: kkTaking 1.0 as a reliable coefficient; i ise.maxThe rated current of the electric locomotive or the motor train unit with the maximum power running on the line is obtained.
And (3) action time limit: the action time limit is the same between the substation and the distance III section; the action time limit of the front n-1 stage switching station and the distance II section is the same; in the nth stage switching station, the single line has the same action time limit as the distance I section, and the multiple line has the same action time limit as the distance II section.
The reclosing time is defined as 2 s; the return time period was defined as 20 s.
The voltage of the no-voltage auto-switch is fixed to 50V, and the operation time is fixed to 3 s.
The action voltage of the detected pressure reclosing is set to be 70V; the operation time is set to 3 s.
The beneficial technical effects of the invention are as follows:
the invention provides an optimized protection method for a multi-stage switching station series traction network, which reduces the protection stage number and shortens the tripping time;
the invention provides a whole set of protection configuration and setting calculation method aiming at a multi-stage switching station series connection traction network, which can be directly applied to engineering practice;
the method can be realized by changing corresponding software functions in the existing protection device, and has the characteristics of low cost, simple and convenient realization and the like.
Drawings
FIG. 1 is a schematic diagram of power supplied via an n-stage switching station;
fig. 2 is a schematic diagram of power supplied through a 2-stage switching station.
Detailed Description
The invention is described in further detail below with reference to the figures and specific embodiments.
The invention discloses a relay protection method for a traction network connected in series with a multi-stage switching station, wherein the traction network is powered by a traction substation and an n-stage switching station in series, and the power supply schematic diagram is shown in figure 1. The circuit breakers are arranged on the feeder line of the traction substation and the inlet line and the feeder line of each stage of switching station, and the corresponding protection functions are configured according to the table 1.
TABLE 1 traction network protection arrangement supplied by n-stage switching station
1. Substation feeder protection setting calculation
Distance I section
Reactance setting value: setting of switching station not exceeding 1 stage according to protection range, see formula (1)
In the formula: kk-reliability factor, take 0.85; l is0-the supply line length in kilometres (km); x is the number of0-unit reactance of the supply line in ohms per kilometre (Ω/km); l is1-contact line length in kilometres (km); x is the number of1-unit reactance of the catenary in ohms per kilometre (Ω/km); n isCT-current transformer transformation ratio; n isPT-voltage transformer transformation ratio.
Resistance constant value: and setting according to the avoided minimum load impedance, and obtaining a formula (2).
In the formula: kk-reliability factor, take 1.2; u shapemin-minimum operating voltage of the substation in volts (V); i isxfahm.-maximum load current of the feeder in amperes (a);
-load impedance angle in degrees (°);
line impedance angle in degrees (°).
And (3) action time limit: the setting is generally 0.1 s.
Distance II section
Reactance setting value: and the distance I section of the feeder line of the switching station is set according to the protection range not exceeding 1 stage, which is shown in a formula (3).
In the formula: kk-reliability factor, take 0.85; l is1-the length of the catenary from the substation to the 1 st-stage switchyard in kilometres (km); kfThe flow dividing coefficient is that 1 is taken for the single inlet wire operation of the 1-level switching station, and 2 is taken for the double inlet wire parallel connection; l is2The length of a contact network of the shortest line in the 1-level switching station is kilometer (km); x is the number of 2And the unit reactance of a contact network of a 1-level switching station is in ohm per kilometer (omega/km).
Resistance constant value: the constant value is the same as the constant value of the resistance of the section I away.
And (3) action time limit: and the time limit of the distance I section of the feeder line of the 1-level switching station is matched with the time limit of the distance I section of the feeder line of the 1-level switching station, and the time limit is defined as the sum of the time limit of the distance I section of the feeder line of the 1-level switching station and delta T.
Distance III section
Reactance setting value: and providing complete far backup setting for a 1-stage switching station feeder line, see formula (4).
In the formula: kk-reliability factor, take 1.2; l is3The length of a contact network of the longest line in the 1-level switching station is kilometer (km); x is the number of3And the unit reactance of a contact network of the 1-level switching station is ohm per kilometer (omega/km).
Resistance constant value: the resistance constant value is the same as that of the distance I section.
And (3) action time limit: and the time limit of the feeder line distance II section of the 1-level switching station is matched with the time limit of the feeder line distance II section of the 1-level switching station, and the time limit is defined as the sum of the time limit of the feeder line distance II section of the 1-level switching station and the delta T.
Quick break of current
Operating current: and setting the maximum short-circuit current at the feeder outlet of the switching station according to the 1-stage switching mode, which is shown in a formula (5).
In the formula: kk-reliability factor, take 1.2; i isd.maxAnd the maximum short-circuit current flowing through the feeder circuit breaker of the substation when the feeder outlet of the 1-level switching substation is in fault is in ampere (A).
And (4) checking the sensitivity according to the maximum short-circuit current at the feeder circuit breaker of the substation, which is shown in a formula (6).
In the formula: I.C. Ad.b.max-maximum short circuit current in amperes (a) for the fault at the feeder circuit breaker of the substation.
If the sensitivity is not satisfied, the current can be cut off rapidly without being input.
And (4) action time limit: the setting is generally 0.1 s.
Low voltage starting overcurrent
Operating voltage: and setting according to the avoided minimum operation voltage, and obtaining a formula (7).
In the formula: kkThe reliability factor, taken as 1.2.
Operating current: the terminal fault is set according to the maximum load current of the feed line and enough sensitivity of the terminal fault is ensured, see formula (8).
In the formula: kk-reliability factor, take 1.2; klmSensitivity factor, typically 1.2; i isd.minMinimum short-circuit current (single line) at end-of-line fault, minimum short-circuit current (multiple line) in amperes (a) flowing through the protective installation of the substation at substation fault.
And (3) action time limit: the action time limit is the same as that of the distance III section.
Increment of current
Operating current: the maximum increment is set within a power frequency period according to the load current of the hidden line, and the rated current of a single-train electric locomotive or a motor train unit is generally estimated according to a formula (9).
In the formula: kk-reliability factor, typically taken to be 1.0; i ise.max-rated current in amperes (a) for the maximum power electric locomotive or motor train unit on which the line operates.
And (3) action time limit: the action time limit is the same as that of the distance III section.
Reclosing lock
Reclosing time limit: generally setting to 2 s; resetting time limit: typically 20 s.
2. Switching station feeder protection setting calculation
The first n-1 level switching station feeder protection:
distance I section
Reactance setting value: and the protection range does not exceed the setting of the next stage switching station, which is the same as the formula (1). In the formula, L0Taking the length value of the power supply line of the next stage switching station; l is1And taking the length value of the contact net of the next stage switching station.
Resistance constant value: setting according to the avoiding minimum load impedance, and the same as the formula (2).
And (3) action time limit: the setting is generally 0.1 s.
Distance II section
Reactance setting value: according to the method for providing far backup setting for the next stage of switching station feeder line, the formula is as follows:
in the formula: kkThe reliability coefficient is 1.5; kfThe current splitting coefficient is adopted, the single incoming line operation of the next stage switching station is 1, and the double incoming lines are connected in parallel to be 2; l is2The value of (a) is the length value of the contact network of the longest line in the next stage switching station.
Resistance constant value: the resistance constant value is the same as that of the distance I section.
And (3) action time limit: and the time limit of the distance I section of the feeder line of the next stage of switching station is matched with the time limit of the distance I section of the feeder line of the next stage of switching station, and the time limit is added with delta T.
Quick break of current
Operating current: and (4) setting the maximum short-circuit current at the feeder outlet of the switching station according to the same formula (5) when the next stage of switching station is avoided.
And (4) according to the maximum short-circuit current checking sensitivity of the feeder circuit breaker of the switching station, the maximum short-circuit current checking sensitivity is the same as the formula (6).
And (4) action time limit: the setting is generally 0.1 s.
Low voltage starting overcurrent
Operating voltage: setting according to the avoided lowest operation voltage, and the same as the formula (7).
Operating current: and (4) setting according to the maximum load current of the feed line and the condition that the fault at the tail end has enough sensitivity, which is the same as the formula (8).
And (3) action time limit: the action time limit is the same as that of the distance II.
Increment of current
The operating current is calculated by equation (9).
And (3) action time limit: the action time limit is the same as that of the distance II.
Reclosing lock
Reclosing time limit: generally setting to 2 s; resetting time limit: typically 20 s.
Feeder protection of the nth stage switching station:
distance I section
Reactance setting value: and (4) setting the single-line structure traction network according to the total length of the protection circuit, which is the same as the formula (1). In the formula: reliability factor Kk1.5 is taken.
For a compound line structure traction network, setting a circuit breaker of a sub-area is not exceeded according to a protection range, K in the formula (1)kTake 0.85.
To ensure reliable tripping in short line faults, the primary value of the reactance setting should generally not be less than 2 Ω.
Resistance constant value: and setting according to the avoided minimum load impedance, and obtaining a formula (2). In the formula: reliability factor KkTaking 1.2; u shapeminAnd taking the lowest operation voltage value of the nth stage switching station.
And (4) action time limit: the setting is generally 0.1 s.
Distance II section (only to compound line traction net)
Reactance setting value: for the compound line structure traction network, the full length of the uplink and the downlink is set according to the protection, specifically
In the formula: kkTake 1.2.
Resistance constant value: the resistance constant value is the same as that of the distance I section.
And (3) action time limit: and matching with the time limit of the section I away from the subarea, and setting the time limit of the section I away from the subarea plus delta T.
Low voltage starting overcurrent
Operating voltage: by avoiding the lowest operating voltageAnd (5) setting, which is the same as the formula (7). In the formula: u shapeminTaking the lowest operation voltage value of the n-stage switching station; kkTake 1.2.
Operating current: and (4) setting according to the maximum load current of the feed line and the condition that the fault at the tail end has enough sensitivity, which is the same as the formula (8). In the formula: kkTake 1.2.
And (3) action time limit: the action time limit is the same as that of the distance I (single line) and the action time limit is the same as that of the distance II (multiple lines).
Increment of current
The operating current is calculated by equation (9).
And (3) action time limit: the action time limit is the same as that of the distance I (single line) and the action time limit is the same as that of the distance II (multiple lines).
Reclosing lock
Reclosing time limit: generally setting to 2 s; resetting time limit: typically 20 s.
3. Open-close station inlet wire protection setting calculation (Single inlet wire operation)
The voltage constant value of the voltage-loss self-throw is generally set to 50V, and the operation time is generally set to 3 s.
4. Open-close station inlet line protection setting calculation (double inlet line parallel)
Distance I section
Reactance setting value: and (4) setting according to the total length of the protection inlet wire, and obtaining the same formula (1). In the formula: kk1.5 is taken.
Resistance constant value: setting according to the avoiding minimum load impedance, and the same as the formula (2).
And (3) action time limit: the setting is generally 0.1 s.
Detecting pressure reclosing
Operating voltage: the setting is 70V; and (3) action time limit: the whole was set to 3 s.
In the embodiment, a 2-stage switching station is used as an example for supplying power, a schematic diagram of the power supply is shown in fig. 2, and the protection function is configured according to table 2.
TABLE 1 traction network protection arrangement supplied via 2-stage switching station
Substation feeder protection setting calculation
Distance I section
Reactance setting value: setting of switching station not exceeding 1 stage according to protection range
Resistance constant value: setting by avoiding minimum load impedance
And (3) action time limit: the whole was set to 0.1 s.
Distance II section
Reactance setting value: and the distance I section of the feeder line of the switching station is set according to the protection range not exceeding 1 level.
Resistance constant value: the resistance constant value is the same as that of the distance I section.
And (3) action time limit: the whole was set to 0.2 s.
Distance III section
Reactance setting value: and providing complete far backup setting for a 1-stage switching station feeder line.
Resistance constant value: the resistance constant value is the same as that of the distance I section.
And (3) action time limit: the whole was set to 0.3 s.
Quick break of current
Operating current: and setting the maximum short-circuit current at the feeder outlet of the switching station according to the condition of avoiding 1-stage switching.
And (4) checking the sensitivity according to the maximum short-circuit current at the feeder circuit breaker of the substation, which is shown in a formula.
And (3) action time limit: the whole was set to 0.1 s.
Low voltage starting overcurrent
Operating voltage: and setting according to the condition of avoiding the lowest operation voltage.
Operating current: and the maximum load current of the feeder line is avoided and the terminal fault is ensured to have enough sensitivity to be set.
And (3) action time limit: the whole was set to 0.3 s.
Increment of current
Operating current: and setting according to the maximum increment within one power frequency period of the load current of the hidden line, and estimating according to the rated current of the single-row electric locomotive or the motor train unit.
And (3) action time limit: the whole was set to 0.3 s.
Reclosing lock
Reclosing time limit: setting the time to be 2 s; resetting time limit: the whole was 20 s.
1-stage switching station feeder protection setting calculation
Distance I section
Reactance setting value: and the protection range does not exceed the setting of 2-stage switching stations.
Resistance constant value: avoiding the minimum load impedance setting.
And (3) action time limit: the whole was set to 0.1 s.
Distance II section
Reactance setting value: and providing far backup setting for the feeder line of the 2-stage switching station.
Resistance constant value: the resistance constant value is the same as that of the distance I section.
And (3) action time limit: the whole was set to 0.2 s.
Quick break of current
Operating current: and setting the maximum short-circuit current at the feeder outlet of the switching station according to the avoiding of 2 stages.
And the maximum short-circuit current checking sensitivity at the feeder circuit breaker of the substation is opened and closed according to the 1 level.
And (4) action time limit: the whole was set to 0.1 s.
Low voltage starting overcurrent
Operating voltage: and setting according to the condition of avoiding the lowest operation voltage.
Operating current: and the maximum load current of the feeder line is avoided and the terminal fault is ensured to have enough sensitivity to be set.
And (3) action time limit: the whole was set to 0.2 s.
Increment of current
Operating current: and setting according to the maximum increment within one power frequency period of the load current of the hidden line, and estimating according to the rated current of the single-row electric locomotive or the motor train unit.
And (3) action time limit: the whole was set to 0.2 s.
Reclosing lock
Reclosing time limit: setting the time to be 2 s; resetting time limit: the whole was 20 s.
2-stage switching station feeder protection setting calculation
Distance I section
Reactance setting value: setting according to the whole length of the protection circuit.
The first order value of the reactance setting should be greater than 2 omega.
Resistance constant value: avoiding the minimum load impedance setting.
And (3) action time limit: the whole was set to 0.1 s.
Low voltage starting overcurrent
Operating voltage: and setting according to the condition of avoiding the lowest operation voltage.
Operating current: setting according to the maximum load current of the hidden feeder line and ensuring enough sensitivity of the end fault, see formula
And (3) action time limit: the whole was set to 0.1 s.
Increment of current
Operating current: and setting according to the maximum increment within one power frequency period of the load current of the hidden line, and estimating according to the rated current of the single-row electric locomotive or the motor train unit.
And (3) action time limit: the whole was set to 0.1 s.
Reclosing lock
Reclosing time limit: setting the time to be 2 s; resetting time limit: the whole was 20 s.
Open-close station inlet wire protection setting calculation (Single inlet wire operation)
The voltage of the no-voltage auto-switch is fixed to 50V, and the operation time is fixed to 3 s.
Open-close station inlet line protection setting calculation (double inlet line parallel)
Distance I section
Reactance setting value: setting according to the whole length of the protection inlet wire.
Resistance constant value: set by avoiding minimum load impedance.
And (3) action time limit: the whole was set to 0.1 s.
Detecting pressure reclosing
Operating voltage: the setting is 70V; and (3) action time limit: the whole was set to 3 s.
Claims (1)
1. A relay protection method for a multi-stage switching station series connection traction network is characterized in that the traction network is powered by a traction substation and n-stage switching stations in series connection, and circuit breakers are arranged on feeder lines of the traction substation and inlet lines and feeder lines of the switching stations at all stages; respectively carrying out protection setting calculation on a substation feeder line, a switching station incoming line, a front n-1-level switching station feeder line and an nth-level switching station feeder line; then protection configuration is carried out according to corresponding calculation results;
the protection configuration of the feeder line of the substation is distance I section, distance II section, distance III section, current quick break, low-voltage starting overcurrent, current increment and reclosing;
The inlet wire of the switching station comprises single inlet wire operation and double inlet wire parallel connection, and the single inlet wire operation protection configuration is voltage-loss automatic switching; the double-inlet-wire parallel protection configuration is a distance I section and a detected voltage reclosing switch;
the front n-1-level switching station feeder line protection is configured into a distance I section, a distance II section, a current quick break, a low-voltage starting overcurrent, a current increment and a reclosing switch;
the nth stage switching station feeder line protection configuration is distance I section, distance II section, low-voltage starting overcurrent, current increment and reclosing;
the distance I section protection setting calculation is as follows:
the reactance constant value calculation formula is as follows:
in the formula: kkFor a reliable coefficient, 0.85 is taken when a substation feeder line and a front n-1-level switching station feeder line are subjected to setting calculation, and 1.5 is taken when a switching station inlet line and an nth-level switching station feeder line are subjected to calculation; l is0For length of supply line, x0Is a unit reactance of the power supply line, L1Is the length of the contact net, x1Is the unit reactance of the contact network, nCTFor current transformer transformation ratio, nPTThe transformation ratio of the voltage transformer is obtained;
the resistance constant value calculation formula is as follows:
in the formula: kkIs a reliable coefficient, the value is 1.2, UminIs the lowest operating voltage of the substation or switching station, Ifh.maxIs the maximum load current of the feeder line,
in order to be the load impedance angle,
is the line impedance angle;
Setting the operation time to 0.1 s;
the distance II section protection setting calculation of the feeder line of the substation is as follows:
the reactance setting value calculation formula is as follows:
in the formula: kkThe reliability coefficient is 0.85, KfThe current splitting coefficient is adopted, the single inlet wire operation of the switching station is 1, and the double inlet wire parallel connection is 2; l is2The value of (a) is the length of the contact network of the shortest line in the 1-stage switching station, x2Is a 1-level switching station contact net unit reactance;
the resistance constant value is the same as the resistance constant value of the distance I section;
the action time limit is matched with the time limit of the distance I section of the feeder line of the 1-level switching station, and the action time limit is defined as the time limit of the distance I section of the feeder line of the 1-level switching station plus the time delay delta T;
and (3) the distance II section protection setting calculation of the front n-1 stage switching station:
the reactance constant value calculation formula is as follows:
in the formula: kkThe reliability coefficient is 1.5; kfThe current splitting coefficient is adopted, the single incoming line operation of the next stage switching station is 1, and the double incoming lines are connected in parallel to be 2; l is2The value of (A) is the length value of the contact network of the longest line in the next stage switching station; x is the number of2The unit reactance of the contact network of the next stage switching station;
the resistance constant value is the same as the resistance constant value of the distance I section;
the action time limit is matched with the time limit of the distance I section of the feeder line of the next-stage switching station, and the action time limit is set by adding the time limit of the distance I section of the feeder line of the next-stage switching station with the time delay delta T;
The distance II section of the nth stage switching station feeder line is only set for the compound line traction network, and the protection setting calculation is as follows:
the reactance constant value setting formula is as follows:
in the formula: kkTaking 1.2 as a reliable coefficient;
the resistance constant value is the same as the resistance constant value of the distance I section;
the action time limit is matched with the time limit of the section I away from the subarea, and the action time limit is set by adding the time limit of the section I away from the subarea with the time delay delta T;
the distance III section protection setting calculation is as follows:
the reactance constant value calculation formula is as follows:
in the formula: kkFor reliability factor, take 1.2, L3Length of contact net of longest line in 1-stage switching station, x3Is a unit reactance of a switching station contact network;
the resistance constant value is the same as the resistance constant value of the distance I section;
setting the action time limit to be the time limit of the distance II section plus delta T;
the current quick-break protection setting calculation is as follows:
the action current setting formula is as follows:
in the formula: kkTaking 1.2 as a reliable coefficient; i isd.maxThe maximum short-circuit current flowing through the substation or the breaker of the substation feeder line when the fault occurs at the outlet of the substation feeder line;
checking the sensitivity according to the maximum short-circuit current at the feeder circuit breaker of the substation or the stage, see formula
In the formula: i isd.b.maxThe maximum short-circuit current of the fault at the feeder circuit breaker of the substation is switched for the substation or the stage;
If the sensitivity is not satisfied, the current is not put into the circuit to be quickly cut off;
setting the operation time to 0.1 s;
the low-voltage starting overcurrent protection setting calculation is as follows:
the action voltage setting formula is as follows:
in the formula: u shapeminIs the lowest operating voltage, K, of a substation or a local substationkTaking 1.2 as a reliable coefficient;
the action current setting formula is as follows:
in the formula: kkTaking 1.2 as a reliable coefficient; klmFor sensitivity coefficient, take 1.2, Ifh.maxFor maximum load current of the feeder, Id.minThe minimum short-circuit current is the minimum short-circuit current when the tail end of a line fails during single line or the minimum short-circuit current flowing through the protection installation position of the substation during fault of a subarea substation during compound line;
and (3) action time limit: the action time limit is the same between the substation and the distance III section; the action time limit of the front n-1 stage switching station and the distance II section is the same; in the nth stage switching station, the single line time is the same as the action time limit of the first section of the distance, and the multiple line time is the same as the action time limit of the second section of the distance;
the current increment protection setting calculation is as follows:
the action current setting formula is as follows:
in the formula: kkTaking 1.0 as a reliable coefficient; i ise.maxRated current of the electric locomotive or the motor train unit with the maximum power running for the line;
and (3) action time limit: the action time limit is the same between the substation and the distance III section; the action time limit of the front n-1 stage switching station and the distance II section is the same; in the nth stage switching station, the single line time is the same as the action time limit of the first section of the distance, and the multiple line time is the same as the action time limit of the second section of the distance;
The reclosing time is set to be 2 s; the resetting time is defined as 20 s;
the voltage fixed value of the voltage-loss automatic switching is set to be 50V, and the voltage fixed value is set to be 3s during operation;
the action voltage of the detected voltage reclosure is set to be 70V; the operation time is set to 3 s.
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