CN115201621A - Fault processing and isolating method adopting arc suppression coil branch current method - Google Patents

Fault processing and isolating method adopting arc suppression coil branch current method Download PDF

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Publication number
CN115201621A
CN115201621A CN202110393886.0A CN202110393886A CN115201621A CN 115201621 A CN115201621 A CN 115201621A CN 202110393886 A CN202110393886 A CN 202110393886A CN 115201621 A CN115201621 A CN 115201621A
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fault
arc suppression
suppression coil
branch
current
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李景禄
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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
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
    • 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
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil

Abstract

The invention discloses a fault processing and isolating method by adopting an arc suppression coil branch current method, which is characterized in that when a power grid normally runs in an arc suppression coil grounding mode, the branch current and the increment of the branch current of the arc suppression coil are detected, when the branch current increment of the arc suppression coil reaches a certain value, the power grid is judged to have a single-phase grounding fault, firstly, the arc suppression coil carries out arc suppression on the grounding fault, and then, the fault property is judged according to the branch current increment of the arc suppression coil after a certain time. And when the fault is judged to be a permanent fault, dynamically switching to a resistance grounding mode, selecting a grounding fault line by a feeder zero sequence current amplitude comparison method, and realizing fault area isolation by matching with the intelligent switch of the distribution line.

Description

Fault processing and isolating method adopting arc suppression coil branch current method
Technical Field
The invention mainly belongs to the field of neutral point grounding of a power distribution network, and particularly relates to a fault judgment, fault processing and fault area isolation method for an arc suppression coil grounding mode, which is used for solving the problem of fault judgment, fault processing and fault area isolation of the neutral point arc suppression coil grounding mode of the power distribution network.
Background
When a single-phase earth fault occurs in a power distribution network in an arc suppression coil grounding mode, zero-sequence current flowing through a fault circuit is residual current compensated by the arc suppression coil, zero-sequence current flowing through a non-fault circuit is earth capacitance current of the circuit and is influenced by tuning of the arc suppression coil and difference of capacitance current of each circuit, the zero-sequence current of the fault circuit and the zero-sequence current of the non-fault circuit are irregular in size, the fault circuit cannot be determined by adopting a zero-sequence current amplitude comparison method, and fault line selection cannot be performed by adopting a zero-sequence current line selection method. In order to solve the problem of fault line selection in the arc suppression coil grounding mode, various grounding line selection methods are developed for arc suppression coil compensation power grids at home and abroad, such as: the method comprises a transient current method, a residual current increment method, a 5 th harmonic wave method, an S injection method, an arc suppression coil and resistance method, an active component method, an information fusion method and other grounding line selection methods, but due to various factors such as the influence of structural difference of a power distribution network, the influence of field interference, the influence of signal acquisition sensitivity, the influence of working point drift of electronic components and the like, the problem of accuracy of compensating the grounding line selection of a power grid cannot be solved so far, and particularly the problem of low accuracy of line selection when line breakage and high resistance grounding occur.
The primary and secondary fusion intelligent switch installed on the distribution line aims to perform regional isolation according to the region where the fault occurs when the distribution network has a fault, but when the arc suppression coil treats the ground fault, the current flowing through a fault loop is residual current compensated by the arc suppression coil, and the current has great dispersion under the influence of the tuning of the automatic arc suppression coil, is sometimes even zero, but is generally required to be less than 10 amperes; the current flowing through the head end of the non-fault loop is the earth capacitance current of the line, and the current changes along with the distribution of the earth capacitance of the line on a feeder line, and sudden change can be generated on the boundary point of the overhead line and the cable line of the overhead and cable mixed line, so that when a single-phase earth fault occurs, the zero sequence current amplitude value flowing through the fault line and the non-fault line is irregular, not only is the earth line selection difficult, but also because the zero sequence current flowing through the fault line is small, and the sudden change of the zero sequence current flowing through the non-fault loop causes that the primary-secondary integrated intelligent switch can not adopt the zero sequence current protection and differential protection method to realize fault area isolation. Namely, the arc suppression coil grounding mode conflicts with the intelligent switch in the function of processing single-phase grounding, so that the intelligent switch cannot perform regional isolation on single-phase grounding faults.
The power distribution network changes in an operation mode in an arc suppression coil grounding mode, neutral point displacement voltage can generate unstable change when arc suppression coil adjustment and power grid unstable disturbance occur, in addition, an automatic tracking arc suppression coil started by a neutral point displacement voltage fixed value cannot be started due to low neutral point displacement voltage when a high-resistance grounding mode is adopted, unstable change of the neutral point displacement voltage can be caused by switching on and off of an arc suppression coil damping resistor and adjustment of the arc suppression coil, and great difficulty can be brought to fault starting and fault property judgment by adopting the neutral point displacement voltage.
Therefore, a regional isolation method which can solve the problems of high-resistance earth fault starting, fault property judgment, earth line selection and permanent earth fault of an arc suppression coil earth mode, is matched with an intelligent switch and realizes the fault of the single-phase earth fault is very necessary.
Disclosure of Invention
In order to solve the problems, the invention provides a fault judgment, fault treatment and fault area isolation method adopting arc suppression coil current increment, a knife switch K is connected in series with a neutral point of a grounding transformer of an arc suppression coil complete set device, and an arc suppression branch switch QF is arranged on the secondary side of the knife switch K L Connected to current transformer TA L And an arc suppression coil branch circuit formed by an arc suppression coil; a resistance branch switch QF is connected in parallel beside the arc suppression coil branch R Resistor R and current transformer TA R A resistance branch circuit is formed; each feeder line is provided with a zero sequence current transformer and zero sequence current protection; and an intelligent switch with zero-sequence current protection and a communication background is arranged at a feed line node.
When the power grid normally operates, the knife switch K is switched on and the arc suppression branch switch QF L Switch-on, resistance branch switch QF R Opening a brake, wherein the power grid operates in an arc suppression coil grounding mode; current transformer TA by arc suppression coil branch L Collecting branch current I of arc suppression coil L0 (ii) a When at T 0 Constantly detecting stable increment delta I of arc suppression coil branch current L If the difference is larger than or equal to delta, the power grid is judged to have a stable single-phase earth fault, and T is set 0 As a starting point of the occurrence of the ground fault, firstly, arc extinction processing is carried out on the ground fault by an arc extinction coil; and delta is a criterion for judging whether the single-phase earth fault occurs or not, and is set according to the detection sensitivity of the arc suppression coil branch current transformer.
Time delay delta T 1 After that, e.g. arc suppression coil branch current I L <I L0 And δ, judging that the ground fault is a transient fault, and successfully extinguishing the arc of the arc suppression coil; delta T 1 This value is obtained experimentally for the longest time for the arc suppression coil to eliminate transient single-phase ground faults.
Time delay delta T 1 After that, the air conditioner is started to work,if, for example, the branch current I of the arc suppression coil L ≥I L0 + delta, judging that the grounding fault is a permanent fault, and arc suppression failure of the arc suppression coil; at the moment, the resistor branch switch QF is closed R Time delay DeltaT 2 QF branch switch for switching off arc suppression coil L Dynamically switching to a neutral point to be grounded through a resistor, wherein a feeder line with the largest zero-sequence current in the feeder lines is a ground fault line; delta T 2 For switching on the resistor branch switch QF R And taking 1 second as the transition process time of the rear power grid.
Time delay delta T after selection of ground fault line 3 During the period, the fault area is isolated according to the zero sequence current value I of the earth fault line G0 Zero sequence current setting value I of intelligent switch 0D Comparing, if the zero sequence current I of the earth fault line G0 ≥I 0D Starting zero sequence current protection of intelligent switches of each node of the feeder line to isolate a fault region; delta T 3 The longest time for completing fault area isolation for the intelligent switch of the distribution line.
Zero sequence current setting value I of intelligent switch zero sequence protection 0D By maximum capacitive current to ground I in the feed line mxc0 Obtained by modification, namely: i is 0D =K j K y K x I mxc0 ，K j The seasonal variation coefficient of the feeder line to ground capacitance current; k y The change coefficient of the operation mode of the feeder line to ground capacitance current; k is x And selecting a coefficient for zero sequence current protection.
The time constant value of the intelligent switch zero sequence protection is set in a differentiation mode, namely: setting the zero sequence protection time fixed value of the intelligent switches on all the end nodes on the feeder line to be minimum; the zero sequence protection time constant value of each contact intelligent switch connected in series on the feeder line from the tail end of the feeder line to the power supply side is gradually increased; setting the zero sequence protection time fixed value of the intelligent switch of the superior node at the connection part of the branch line and the main line of the feeder line according to the maximum incremental time in the serially connected nodes; the zero sequence protection time fixed value of the feeder line outlet switch is maximum, and the time is set as T k Then Δ T 3 >T k 。
If the zero sequence current I of the earth fault line G0 <I 0D Communicating with the background of the feeder intelligent switch, checking the zero sequence current of each node of the fault feeder through a background control system of the feeder intelligent switch, and realizing fault area isolation according to the zero sequence current distribution of each node; if zero-sequence current flows through the end node of the feeder line or the end node of the branch, disconnecting the intelligent switch of the node to carry out fault isolation; if the node is a middle node on the feeder line, if the node is detected to have zero-sequence current flowing through and all lower-level nodes of the node are not detected to have zero-sequence current flowing through, the intelligent switch of the node is disconnected for fault area isolation.
QF (quad Flat No-lead) switch for switching on arc extinction branch circuit after fault area isolation is completed L Break the resistor branch switch QF R Resetting the device; if it cannot be at Δ T for any reason 3 The fault area is isolated within time, and the arc-extinguishing branch switch QF is still switched on L Break the resistor branch switch QF R The device is reset forcibly.
K j Taking 1.3-1.5 as seasonal variation coefficient of the capacitance-to-ground current of the feeder line; k y Taking 1.3-1.5 as the variation coefficient of the operation mode of the feed line-to-ground capacitance current; k x The zero-sequence current protection selection coefficient adopted for ensuring the maximum zero-sequence current avoiding the non-fault feeder line is 1.3-1.5.
ΔT 3 Time required for fault zone isolation for feeder intelligence switches, Δ T 3 And the zero sequence current protection time is larger than the fixed value of the zero sequence current protection time of the fault feeder line outlet switch.
The invention has the following advantages:
1. the method solves the starting of the high-resistance grounding fault by using the stable increment of the branch current of the arc suppression coil, and eliminates the disturbance influence of the change of the operation mode of the power grid and the inductance adjustment of the arc suppression coil.
2. The method solves the problem of judging transient faults and permanent faults by using the stable increment of the branch current of the arc suppression coil.
3. The invention solves the worldwide technical problem of grounding and line selection in the arc suppression coil grounding mode.
4. The invention solves the problem of conflict of the arc suppression coil mode on the isolation function of the fault area of the intelligent switch of the distribution line.
5. The method provided by the invention is simple and easy to implement, and can be used for transforming the operated arc suppression coil.
Drawings
FIG. 1 is a wiring diagram of the device.
Detailed Description
A disconnecting link K is connected in series with a neutral point of a grounding transformer of the arc suppression coil complete set device, and a secondary edge of the disconnecting link K is connected with an arc suppression branch switch QF L Connected to current transformer TA L And an arc suppression coil branch circuit formed by the arc suppression coil; a resistance branch switch QF is connected in parallel beside the arc suppression coil branch R Resistor R and current transformer TA R A resistance branch circuit is formed; each feeder line is provided with a zero sequence current transformer and zero sequence current protection; and an intelligent switch with zero sequence current protection and a communication background is arranged on a feed line node.
When the power grid normally operates, the knife switch K closes the switch and the arc extinguishing branch switch QF L Switch-on and resistance branch switch QF R Opening a brake, wherein the power grid operates in an arc suppression coil grounding mode; current transformer TA by arc suppression coil branch L Collecting branch current I of arc suppression coil L0 (ii) a When at T 0 Constantly detecting stable increment delta I of arc suppression coil branch current L If the difference is larger than or equal to delta, the power grid is judged to have a stable single-phase earth fault, and T is set 0 As a starting point of the occurrence of the ground fault, firstly, arc extinction processing is carried out on the ground fault by an arc extinction coil; and delta is a criterion for judging whether the single-phase earth fault occurs or not, and is set according to the detection sensitivity of the arc suppression coil branch current transformer.
Time delay delta T 1 After that, e.g. arc suppression coil branch current I L <I L0 + delta, judging that the grounding fault is a transient fault, and successfully extinguishing the arc of the arc suppression coil; delta T 1 This value is obtained experimentally for the longest time for the arc suppression coil to eliminate transient single-phase ground faults.
Time delay delta T 1 Then, if, for example, the arc suppression coil branch current I L ≥I L0 And + delta, judging that the earth fault is a permanent fault, and arc suppression coil fails to extinguish arc(ii) a At the moment, the resistor branch switch QF is switched on R Time delay DeltaT 2 QF branch switch for switching off arc suppression coil L Dynamically switching to a neutral point in a resistance grounding mode, wherein a feeder line with the largest zero sequence current in the feeder lines is a grounding fault line; delta T 2 For switching on the resistor branch switch QF R And taking 1 second as the transition process time of the rear power grid.
Time delay delta T after selection of ground fault line 3 During the period, fault area isolation is carried out according to the zero sequence current value I of the earth fault line G0 Zero sequence current setting value I of intelligent switch 0D Comparing, if the zero sequence current I of the earth fault line G0 ≥I 0D Starting zero sequence current protection of intelligent switches of each node of the feeder line to isolate a fault area; delta T 3 The longest time for completing fault area isolation for the intelligent switch of the distribution line.
Zero sequence current setting value I of intelligent switch zero sequence protection 0D Through the maximum capacitance-to-ground current I in each feeder mxc0 Obtained by modification, namely: i is 0D =K j K y K x I mxc0 ，K j The seasonal variation coefficient of the feeder line to ground capacitance current; k y The change coefficient of the operation mode of the feeder line to ground capacitance current; k x And selecting a coefficient for zero sequence current protection.
The time constant value of the intelligent switch zero sequence protection is set in a differentiation mode, namely: setting the zero sequence protection time fixed value of the intelligent switches on all the end nodes on the feeder line to be minimum; the zero sequence protection time constant value of each contact intelligent switch connected in series on the feeder line from the tail end of the feeder line to the power supply side is gradually increased; setting the zero sequence protection time fixed value of the intelligent switch of the upper node at the connection position of the branch line and the feeder line main line according to the maximum incremental time in the serially connected nodes; the zero sequence protection time fixed value of the feeder line outlet switch is maximum, and the time is set as T k Then Δ T 3 >T k 。
If the zero sequence current I of the earth fault line G0 <I 0D Then, the system communicates with the background of the feeder intelligent switch, and the fault feeder is checked through a background control system of the feeder intelligent switchThe zero sequence current of each node of the line realizes fault area isolation according to the zero sequence current distribution of each node; if zero-sequence current flows through the end node of the feeder line or the end node of the branch, disconnecting the intelligent switch of the node to carry out fault isolation; if the node is a middle node on the feeder line, if the node is detected to have zero-sequence current flowing through and all lower-level nodes of the node do not detect zero-sequence current flowing through, the intelligent switch of the node is disconnected to carry out fault area isolation.
QF (quad Flat No-lead) switch for switching on arc extinction branch circuit after fault area isolation is completed L Break the resistor branch switch QF R Resetting the device; if it cannot be at Δ T for any reason 3 The fault area is isolated within time, and the arc-extinguishing branch switch QF is still switched on L Break the resistor branch switch QF R The device is reset forcibly.
K j 1.3-1.5 is taken as the seasonal variation coefficient of the capacitance current of the feeder line to the ground; k is y Taking 1.3-1.5 as the variation coefficient of the operation mode of the feeder line to ground capacitance current; k x The zero-sequence current protection selection coefficient adopted for ensuring the maximum zero-sequence current avoiding the non-fault feeder line is 1.3-1.5.
ΔT 3 Time required for fault zone isolation for feeder intelligence switches, Δ T 3 And the zero sequence current protection time is larger than the fixed value of the zero sequence current protection time of the fault feeder line outlet switch.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.

Claims (3)

1. A fault processing and fault isolating method adopting an arc suppression coil branch current method is characterized in that: a disconnecting link K is connected in series with the neutral point of the grounding transformer of the arc suppression coil complete set device, and the secondary edge of the disconnecting link K is connected with an arc suppression branch switch QF L Connected with a current transformer TA L And an arc suppression coil branch circuit formed by the arc suppression coil; a resistance branch switch QF is connected in parallel beside the arc suppression coil branch R Resistor R and current transformer TA R A resistance branch circuit is formed; each feeder line is provided with a zero sequence current transformer and zero sequence current protection; an intelligent switch with a zero-sequence current protection and communication background is arranged on a feeder line node;
when the power grid normally operates, the knife switch K closes the switch and the arc extinguishing branch switch QF L Switch-on, resistance branch switch QF R Opening a brake, wherein the power grid operates in an arc suppression coil grounding mode; current transformer TA by arc suppression coil branch L Collecting branch current I of arc suppression coil L0 When at T 0 Constantly detecting stable increment delta I of arc suppression coil branch current L If the difference is larger than or equal to delta, the power grid is judged to have a stable single-phase earth fault, and T is set 0 As a starting point of the occurrence of the ground fault, firstly, arc extinction processing is carried out on the ground fault by an arc extinction coil; delta is a criterion for judging whether the single-phase earth fault occurs or not, and is set according to the detection sensitivity of the arc suppression coil branch current transformer;
time delay delta T 1 After that, e.g. arc suppression coil branch current I L <I L0 + delta, judging that the grounding fault is a transient fault, and successfully extinguishing the arc of the arc suppression coil; delta T 1 The longest time for eliminating the transient single-phase earth fault for the arc suppression coil is obtained through experiments;
time delay delta T 1 Then, if, for example, the arc suppression coil branch current I L ≥I L0 + delta, judging that the grounding fault is a permanent fault, and arc extinction failure of the arc extinction coil; at the moment, the resistor branch switch QF is switched on R Time delay Δ T 2 QF branch switch for switching off arc suppression coil L Dynamically switching to a neutral point to be grounded through a resistor, wherein a feeder line with the largest zero-sequence current in the feeder lines is a ground fault line; delta T 2 For switching on the resistor branch switch QF R Taking 1 second as the transition process time of the rear power grid;
time delay delta T after selection of ground fault line 3 During the period, the fault area is isolated according to the zero sequence current value I of the earth fault line G0 Zero sequence current setting with intelligent switchValue I 0D Comparing, if the zero sequence current I of the earth fault line G0 ≥I 0D Starting zero sequence current protection of intelligent switches of each node of the feeder line to isolate a fault area; delta T 3 The longest time for completing fault area isolation for the intelligent switch of the distribution line;
zero sequence current setting value I of intelligent switch zero sequence protection 0D Through the maximum capacitance-to-ground current I in the feeder mxc0 Obtained by modification, namely: I.C. A 0D =K j K y K x I mxc0 ，K j The seasonal variation coefficient of the feeder line to ground capacitance current; k is y The change coefficient of the operation mode of the feeder line to ground capacitance current; k is x Selecting a coefficient for zero sequence current protection;
the time constant value of the intelligent switch zero sequence protection is set in a differentiation mode, namely: setting the zero sequence protection time constant value of the intelligent switches on all the tail end nodes on the feeder line to be minimum; the zero sequence protection time constant value of each contact intelligent switch connected in series on the feeder line from the tail end of the feeder line to the power supply side is gradually increased; setting the zero sequence protection time fixed value of the intelligent switch of the upper node at the connection position of the branch line and the feeder line main line according to the maximum incremental time in the serially connected nodes; the zero sequence protection time fixed value of the feeder line outlet switch is maximum, and the time is set as T k Then Δ T 3 >T k ；
If the zero sequence current I of the earth fault line G0 <I 0D Communicating with the background of the feeder intelligent switch, checking the zero sequence current of each node of the fault feeder through a background control system of the feeder intelligent switch, and realizing fault area isolation according to the zero sequence current distribution of each node; if zero-sequence current flows through the end node of the feeder line or the end node of the branch, disconnecting the intelligent switch of the node to carry out fault isolation; if the node is an intermediate node on the feeder line, if the node is detected to have zero-sequence current flowing through and all lower-level nodes of the node do not detect zero-sequence current flowing through, disconnecting the intelligent switch of the node to carry out fault area isolation;
QF (quad Flat No-lead) arc extinguishing branch switch which is closed after fault area isolation is completed L Break the resistor branch switch QF R Resetting the device; if it cannot be at Δ T for any reason 3 The fault area is isolated within time, and the arc-extinguishing branch switch QF is still switched on L Break the resistor branch switch QF R The device is forced to reset.
2. The fault handling and fault isolating method using the crowbar coil branch current method as set forth in claim 1, wherein: k j Taking 1.3-1.5 as seasonal variation coefficient of the capacitance-to-ground current of the feeder line; k is y Taking 1.3-1.5 as the variation coefficient of the operation mode of the feed line-to-ground capacitance current; k is x The zero-sequence current protection selection coefficient adopted for ensuring the maximum zero-sequence current avoiding the non-fault feeder line is 1.3-1.5.
3. The method for fault handling and fault isolation by arc suppression coil branch current method according to claim 1, wherein: delta T 3 Time required for fault zone isolation for feeder intelligence switches, Δ T 3 And the zero sequence current protection time is larger than the fixed value of the zero sequence current protection time of the fault feeder line outlet switch.
CN202110393886.0A 2021-04-13 2021-04-13 Fault processing and isolating method adopting arc suppression coil branch current method Pending CN115201621A (en)

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CN202110393886.0A CN115201621A (en) 2021-04-13 2021-04-13 Fault processing and isolating method adopting arc suppression coil branch current method

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Application Number Priority Date Filing Date Title
CN202110393886.0A CN115201621A (en) 2021-04-13 2021-04-13 Fault processing and isolating method adopting arc suppression coil branch current method

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CN115201621A true CN115201621A (en) 2022-10-18

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