CN109599849B - Differential protection method for AT section of electrified railway - Google Patents

Differential protection method for AT section of electrified railway Download PDF

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CN109599849B
CN109599849B CN201811442592.7A CN201811442592A CN109599849B CN 109599849 B CN109599849 B CN 109599849B CN 201811442592 A CN201811442592 A CN 201811442592A CN 109599849 B CN109599849 B CN 109599849B
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section
current
head end
voltage
line
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CN109599849A (en
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李书谦
易东
苏骆宁
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Chengdu Shanghua Electric Co Ltd
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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

Abstract

The invention discloses an electrified railway AT section differential protection method, which specifically comprises the steps of synchronously measuring the voltage and the current AT the first end and the last end of an AT section contact line and the current AT the first end and the last end of a negative feeder line by adopting a communication channel; simultaneously, the absolute value of the sum of the current vectors AT the first end and the last end of the AT section contact line and the preset rated current threshold of the AT section contact line are operated and judged to detect whether the AT section has a short-circuit fault or not; if the AT section contact line and/or the AT section negative feeder line has short-circuit fault, the relay protection device sends a tripping command and cuts off the AT section negative feeder line or/and the AT section contact line; and if not, continuing to operate. The invention can eliminate the influence of factors such as traction network structure, operation mode and the like, is suitable for the situation of non-metal short circuit fault with larger transition resistance, and has high protection reliability and sensitivity.

Description

Differential protection method for AT section of electrified railway
Technical Field
The invention relates to the technical field of traction power supply of electrified railways, in particular to a differential protection method for an AT section of an electrified railway.
Background
China has attracted attention in railway construction and achieves good results. By 2017, the business mileage of the railway in China reaches 12.7 km, wherein the operating mileage of the high-speed railway is increased to 2.5 km, which accounts for two thirds of the world and is the first to live in the world stably. High speed railways have without exception employed electric traction. With the increase of the mileage of the high-speed railway, the safe and good operation of the traction power supply system cannot be paid high attention.
The AT (Auto Transformer) power supply mode has the advantages of longer power supply section and larger power supply capacity, can better meet the requirements of high running density, high running speed and large power supply capacity of the high-speed railway, and becomes the mainstream power supply mode of the high-speed railway in China AT the present stage.
The traction net is not standby and exposed in the nature, and the bow net is contacted at a high speed, so that the fault is easily caused, the power failure is caused, and the normal operation is influenced. The high-speed electrified railway AT traction network runs in a downlink and parallel mode, the structure is complex, the uplink and downlink power supply arms trip AT the same time when a fault occurs, then the fault is isolated by superposition, and the reliability of power supply is greatly reduced. AT present, the group of the plum of southwest traffic university combines low voltage to distinguish train flow taking and faults, and can perform sectional tripping of the AT section under more serious faults: the fault of the uplink contact line T only cuts off the uplink contact line T of the AT section, and the fault of the uplink negative feeder line F only cuts off the uplink negative feeder line F of the AT section; the fault of the downlink contact line T only cuts off the downlink contact line T of the AT section, and the fault of the downlink negative feeder line F only cuts off the downlink negative feeder line F of the AT section. However, it is not possible to distinguish between a slight fault and a change in the traction network voltage (in particular, the traction network voltage is not reduced).
Disclosure of Invention
The invention aims to provide a differential protection method for an AT section of an electrified railway, which not only can effectively eliminate the influence of factors such as the structure, the operation mode and the transition resistance of an AT traction network, but also can solve the technical problems of slight fault of the AT traction network and differential protection of voltage change of the traction network.
In order to solve the above technical problems, the present invention adopts a technical solution of:
a differential protection method for an AT section of an electrified railway comprises the following specific steps:
the method comprises the following steps: synchronously measuring the voltage and the current AT the head end and the tail end of the AT section contact wire and the current AT the head end and the tail end of the negative feeder line by adopting a communication channel, and setting the head end voltage of the AT section contact wire as UT1Head end current of IT1Terminal voltage is UT2And a terminal current of IT2And the head end current of the AT section negative feeder line is IF1And a terminal current of IF2；
Step two: simultaneously, the absolute value of the vector sum of the current AT the first end and the current AT the last end of the AT section contact line is judged
Figure BDA0001885004270000011
Rated current threshold I preset with AT section contact lineTsetThe magnitude relation of the positive and negative voltage and the absolute value of the vector sum of the current AT the first and the last ends of the AT section negative feeder line
Figure BDA0001885004270000021
Rated current threshold I preset with AT section negative feederFsetDetecting whether the AT section has short circuit fault or not according to the size relation;
step three: if the AT section contact line and/or the AT section negative feeder line has short-circuit fault, the relay protection device sends a tripping command and cuts off the AT section negative feeder line or/and the AT section contact line; if not, continuing to operate;
wherein when
Figure BDA0001885004270000022
If the fault occurs, the contact line is determined to have a short-circuit fault, the relay protection device sends a tripping instruction, the breaker trips, and the contact line of the fault section is cut off; when in use
Figure BDA0001885004270000023
When the fault occurs, the negative feeder line is determined to have a short-circuit fault, the relay protection device sends a tripping instruction, the breaker trips, and the negative feeder line in the fault section is cut off; when it is satisfied with
Figure BDA0001885004270000024
Andand when the fault occurs, the short circuit fault is determined to occur on the contact line and the negative feeder line at the same time, the relay protection device sends a tripping instruction, the breaker trips, and the contact line and the negative feeder line in the fault section are cut off at the same time.
Preferably, ITsetSet according to the maximum load current of the train under avoidance, and ITset2.0-3.0 times of the rated current of the train can be obtained.
Preferably, IFsetAccording toAccording toAvoiding maximum unbalance current setting, andFsetthe rated current of the train can be 0.2-0.4 times.
Preferably, the condition for determining short-circuit fault of the AT segment contact line in the third step further includes: except for the absolute value of the sum of the current vectors AT the first end and the last end of the AT segment contact line
Figure BDA0001885004270000026
Greater than a rated current threshold I preset by the AT section contact lineTsetIn addition to the conditions of (1), the head end voltage U of the AT section contact line is also satisfiedT1Or terminal voltage UT2Less than rated voltage threshold U of AT section contact wireTset。
Preferably, the condition for determining short-circuit fault of the AT segment contact line in the third step further includes: except that the sum of the current vectors of the first end and the tail end of the AT section contact line is satisfiedAbsolute value of (2)
Figure BDA0001885004270000027
Greater than a rated current threshold I preset by the AT section contact lineTsetIn addition to the conditions of (1), the head end voltage U of the AT section contact line is also satisfiedT1And terminal voltage UT2Greater than rated voltage threshold value U of AT section contact wireTsetHead end current I of AT section contact wireT1And terminal current IT2The rate of change with time is kT1And kT2And k isT1And kT2Are all greater than a constant value kTsetHead end current I of AT section contact wireT1And terminal current IT2The trend of the change is opposite.
Further preferably, ITsetAccording to avoiding maximum unbalance current setting, andTsetthe rated current of the train can be 0.2-0.4 times.
Further preferably, UTsetAnd 16kV may be taken.
Preferably, the communication channel is a fiber-optic communication channel.
Compared with the prior art, the technology of the invention has the beneficial effects that:
the method has the advantages that the fault of the negative feeder line F is judged by the fact that the current difference between the head end and the tail end of the negative feeder line F of the AT section is larger than a preset rated current threshold, and the method has high accuracy.
Judging whether the contact line T has a fault and combining I by the fact that the current difference between the head end and the tail end of the AT section contact line T is larger than a preset rated current threshold valueT1And IT2The fault of the contact line T is judged according to the change of time, the train flow taking and the high and low resistance faults can be distinguished, and the method has high accuracy.
And thirdly, protecting the scheme from the influence of the AT traction network structure, the operation mode and the like.
Fourthly, the universality is good, and the implementation is easy.
Drawings
FIG. 1 is a basic flow diagram of an embodiment of the present invention.
Fig. 2 is a schematic diagram of a TR short circuit according to an embodiment of the present invention.
FIG. 3 is a schematic diagram of an FR short circuit of an embodiment of the invention.
Detailed Description
In order to easily understand the inventive idea of the present invention, the working principle of the present invention is briefly described, specifically: the invention sets the rated voltage of the AT traction network of the electrified railway as E and the length of the AT section as D, and synchronously measures the voltage U of the head end of the contact wire T of the AT sectionT1And head end current IT1Terminal voltage UT2And terminal current IT2Negative feeder line F head end voltage UF1And head end current IF1Terminal UF2And terminal current IF2Then the current difference between the head and the tail of the AT section contact line T is larger than a fixed value, and IT1And IT2Whether the contact line T has faults or not is judged according to the change of time, and finally, fundamental phasor is needed for current and voltage, and the polarity of the current and voltage transformers is required to be consistent with the standard requirement in the graph.
As shown in fig. 1, an embodiment of the present invention provides a differential protection method for an AT section of an electrified railway, wherein the differential protection method specifically includes the following steps:
the method comprises the following steps: synchronously measuring the voltage and the current AT the head end and the tail end of the AT section contact wire T and the current AT the head end and the tail end of the negative feeder F by adopting a communication channel, and setting the head end voltage of the AT section contact wire T as UT1Head end current of IT1Terminal voltage is UT2And a terminal current of IT2And the head end current of the AT section negative feeder F is IF1And a terminal current of IF2. In the embodiment of the present invention, the communication channel is an optical fiber communication channel. In addition, in order to ensure the symmetry of the measurement data of the contact line T and the negative feeder F, the head end voltage U of the negative feeder F of the AT section is applied in practical applicationF1And terminal voltage UF2The measurements are also synchronized.
Step two: simultaneously, the absolute value of the current vector sum of the first end and the last end of the AT section contact line T is judgedRated current threshold I preset with AT section contact line TTsetAnd the magnitude relation of the AT section negative feeder FAbsolute value of vector sum of current at first end and current at last end
Figure BDA0001885004270000041
Rated current threshold I preset with AT section negative feeder FFsetDetecting whether the AT section has short circuit fault or not according to the size relation;
step three: if the AT section contact wire T and/or the AT section negative feeder F have short-circuit faults, the relay protection device sends out a tripping command and cuts off (namely isolates) the AT section negative feeder F or/and the AT section contact wire T; and if not, the train continues to normally run.
The embodiment of the invention specifically comprises the following steps: when in use
Figure BDA0001885004270000042
If the fault occurs, the contact line T is determined to have a short-circuit fault, the relay protection device sends a tripping instruction, the breaker trips, and the contact line T in the fault section is cut off; when in use
Figure BDA0001885004270000043
When the fault occurs, the negative feeder line F is determined to have a short-circuit fault, the relay protection device sends a tripping instruction, the breaker trips, and the negative feeder line F in the fault section is cut off; when it is satisfied with
Figure BDA0001885004270000044
Andand when the fault occurs, the contact line T and the negative feeder F are determined to have short-circuit faults at the same time, the relay protection device sends a tripping instruction, the breaker trips, and the contact line T and the negative feeder F in the fault section are cut off at the same time. The technical scheme of the embodiment of the invention realizes differential protection under the condition that the negative feeder line F has slight fault and the contact line T has larger or slight fault.
In the embodiment of the invention, when
Figure BDA0001885004270000046
In the meantime, the AT section is judged to have a negative feeder F short circuit fault and simultaneously sends out a trip commandCutting off the AT section negative feeder F; wherein IFsetIs a predetermined rated current threshold value and the threshold value IFset According toAvoiding maximum unbalance current setting, andFsetthe rated current of the train can be 0.2-0.4 times. This is the case to achieve differential protection in the event of a slight fault in the negative feed F.
In the embodiment of the invention, when
Figure BDA0001885004270000047
And if the short circuit fault of the contact wire T occurs in the AT section, a tripping command is sent out, and the contact wire T of the AT section is cut off. Wherein ITsetSet according to the maximum load current of the train under avoidance, and ITset2.0-3.0 times of the rated current of the train can be obtained. This is the case in which a large differential flow is achieved in the case where a large fault (regardless of the voltage) occurs at the contact line T.
In the embodiment of the present invention, the condition for determining that the AT segment contact line T has a short-circuit fault in the third step further includes: except for the absolute value of the sum of the current vectors AT the first end and the last end of the AT segment contact line T
Figure BDA0001885004270000048
Greater than the rated current threshold I preset by the AT section contact line TTsetIn addition to the conditions of (1), the head end voltage U of the AT section contact line T is also satisfiedT1Or terminal voltage UT2Less than rated voltage threshold value U of AT section contact line TTset. In addition, ITsetAccording to avoiding maximum unbalance current setting, andTsetthe rated current of the train can be 0.2-0.4 times. This is the case to achieve differential protection with differential flow in case of slight failure of the contact line T and a drop in the traction network voltage. In the embodiment of the invention UTsetAnd 16kV may be taken.
In the embodiment of the present invention, the condition for determining that the AT segment contact line T has a short-circuit fault in the third step further includes: except for the absolute value of the sum of the current vectors AT the first end and the last end of the AT segment contact line T
Figure BDA0001885004270000051
Greater than the rated current threshold I preset by the AT section contact line TTsetIn addition to the conditions of (1), the head end voltage U of the AT section contact line T is also satisfiedT1And terminal voltage UT2Greater than rated voltage threshold value U of AT section contact line TTsetHead end current I of AT section contact wire TT1And terminal current IT2The rate of change with time is kT1And kT2And k isT1And kT2Are all greater than a constant value kTsetHead end current I of AT section contact wire TT1And terminal current IT2The trend of the change is opposite. Wherein, the head end current I of the AT section contact line TT1And terminal current IT2Is contrary to the change trend of IT1And IT2One becoming larger and one becoming smaller. In addition, ITsetAccording to avoiding maximum unbalance current setting, andTsetthe rated current of the train can be 0.2-0.4 times. This is the case to achieve differential protection with a slight fault in the contact line T and with a differential flow without a drop in the traction network voltage. In the embodiment of the present invention, the constant value kTsetRelated to the speed of movement of the train. In the embodiment of the invention UTsetAnd 16kV may be taken.
The relay protection device comprises a sampling board, a CPU board, a switching-out relay board and the like, wherein sampling data are firstly sent to the CPU board, then the CPU logic calculation is carried out, then a tripping instruction is output to a breaker by driving a relay, and finally the tripping or cutting off of an AT section fault line is realized by breaking a circuit through the breaker. Since the specific structure of the relay protection device in the embodiment of the present invention is not a focus of the content of the present invention, details are not described herein.
For a better understanding of the embodiment of the present invention, reference will now be made to the following embodiments, as illustrated in fig. 2 and 3:
as shown in FIG. 2, let the rated voltage of the AT traction network of the electrified railway be E, the length of the AT section be D, and the resistance ZsSynchronous measurement AT section contact line T head end voltage UT1And head end current IT1Terminal voltage UT2And terminal current IT2Is negativeFeed line F head end voltage UF1And head end current IF1Terminal voltage UF2And terminal current IF2When the short-circuit fault occurs to the AT section contact wire T, the following three cases are considered:
(1) when in use
Figure BDA0001885004270000052
And when the short circuit fault of the contact wire T occurs in the AT section, a tripping command is sent out, and the contact wire T of the AT section is cut off. I isTsetThe train rated current is a preset rated current threshold value, the threshold value is set according to the maximum load current of a train which is kept away, and 2.0-3.0 times of the train rated current can be generally taken. This is the case where the differential current is large, i.e., differential regardless of the voltage variation.
(2) When in useAnd U isT1Or UT2And when the voltage is less than 16kV, judging that the short circuit fault of the contact wire T occurs in the AT section, sending a tripping command, and cutting off the contact wire T of the AT section. I isTsetThe train rated current setting method is a preset rated current threshold value, the threshold value is set according to the maximum current of a train which is kept away, and 0.2-0.4 times of the train rated current can be generally taken. This is the case with differential current and differential protection with voltage step down variation.
(3) When in use
Figure BDA0001885004270000061
UT1And UT2Greater than 16kV, IT1And IT2Rate of change with time of kT1And kT2Are all greater than a certain value kTsetAnd I isT1And IT2One is larger and the other is smaller, the short circuit fault of the contact wire T occurs in the AT section, a tripping command is sent, and the contact wire T of the AT section is cut off. I isTsetThe train rated current setting method is a preset rated current threshold value, the threshold value is set according to the maximum current of a train which is kept away, and 0.2-0.4 times of the train rated current can be generally taken. This is a differential protection with differential flow but no voltage drop variation.
As shown in FIG. 3, the rated voltage of the AT traction network of the electrified railway is set as E, ALength of T section is D, resistance ZsSynchronously measuring the voltage U of the T head end of the AT section contact lineT1And head end current IT1Terminal voltage UT2And terminal current IT2Negative feeder line F head end voltage UF1And head end current IF1Terminal voltage UF2And terminal current IF2. Since no vehicle passes through the negative feeder F in the electrified railway, the current flowing into the negative feeder F and the current flowing out of the negative feeder F are equal in magnitude and opposite in direction according to the kirchhoff current law; when in use
Figure BDA0001885004270000062
And if the short circuit fault of the negative feeder line F occurs in the AT section, a tripping command is sent out, and the negative feeder line F of the AT section is cut off. I isFsetA predetermined rated current threshold value IFset According toThe maximum unbalanced current setting is avoided, and 0.2-0.4 times of the rated current of the train can be generally selected.
Therefore, the invention synchronously measures the difference between the currents of the head end and the tail end of the AT section contact line T which are greater than a fixed value and combined with I through the optical fiber differential protection deviceT1And IT2Judging whether the contact line T has a fault or not according to the change of time; and synchronously measuring that the current difference between the head end and the tail end of the AT section negative feeder F is greater than a fixed value to judge whether the negative feeder F has a fault. The method can distinguish train flow taking and high and low resistance faults, and has high accuracy. In addition, the invention is not only suitable for the situation of non-metal short-circuit fault with larger transition resistance, and has high protection reliability and sensitivity, but also is widely suitable for relay protection of the AT traction power supply system of the electrified railway.

Claims (6)

1. A differential protection method for an AT section of an electrified railway is characterized by comprising the following specific steps:
the method comprises the following steps: synchronously measuring the voltage and the current AT the head end and the tail end of the AT section contact wire (T) and the current AT the head end and the tail end of the negative feeder line (F) by adopting a communication channel, wherein the head end voltage of the AT section contact wire (T) is set as
Figure FDA0002327296170000011
Head end current of
Figure FDA0002327296170000012
Terminal voltage of
Figure FDA0002327296170000013
And a terminal current ofAnd the head end current of the AT section negative feeder line (F) is
Figure FDA0002327296170000015
And a terminal current of
Figure FDA0002327296170000016
Step two: simultaneously, the absolute value of the current vector sum of the first end and the last end of the AT section contact line (T) is judgedRated current threshold value preset with AT section contact line (T)
Figure FDA0002327296170000018
The magnitude relation of the positive and negative feed lines (F) and the absolute value of the vector sum of the current AT the first end and the current AT the last end of the negative feed line (F) of the AT section
Figure FDA0002327296170000019
Rated current threshold value preset with AT section negative feeder line (F)
Figure FDA00023272961700000110
Detecting whether the AT section has short circuit fault or not according to the size relation;
step three: if the AT section contact wire (T) and/or the AT section negative feeder (F) has short-circuit fault, the relay protection device sends a tripping command and cuts off the AT section negative feeder (F) or/and the AT section negative feeder (T); if not, the normal operation is continued;
the judgment condition for the short-circuit fault of the AT section contact wire (T) comprises the following steps:
Figure FDA00023272961700000111
head end voltage of AT section contact wire (T)
Figure FDA00023272961700000132
And terminal voltage
Figure FDA00023272961700000133
Greater than the rated voltage threshold of the AT section contact line (T)Head end current of AT section contact wire T
Figure FDA00023272961700000129
And terminal current
Figure FDA00023272961700000128
The rate of change with time is respectivelyAnd
Figure FDA00023272961700000116
and is
Figure FDA00023272961700000117
Andare all greater than a constant value
Figure FDA00023272961700000119
Head end current of AT section contact wire TAnd terminal current
Figure FDA00023272961700000131
The change trend of (A) is opposite; when in use
Figure FDA00023272961700000120
And if so, determining that the negative feeder line (F) has a short-circuit fault.
2. The electrified railway AT section differential protection method of claim 1, wherein:setting according to the maximum load current of the train, and
Figure FDA00023272961700000122
and taking 2.0-3.0 times of the rated current of the train.
3. The electrified railway AT section differential protection method of claim 1, wherein:
Figure FDA00023272961700000123
set according to the maximum unbalance current being avoided, and
Figure FDA00023272961700000124
and taking 0.2-0.4 times of the rated current of the train.
4. The electrified railway AT section differential protection method of claim 1, wherein:set according to the maximum unbalance current being avoided, and
Figure FDA00023272961700000126
and taking 0.2-0.4 times of the rated current of the train.
5. The electrified railway AT section differential protection method of claim 1, wherein:16kV was taken.
6. The electrified railway AT section differential protection method of claim 1, wherein: the communication channel adopts an optical fiber communication channel.
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