CN106646123B - A kind of transmission line of electricity broken string area judging method of relatively residual voltage - Google Patents

A kind of transmission line of electricity broken string area judging method of relatively residual voltage Download PDF

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Publication number
CN106646123B
CN106646123B CN201611119617.0A CN201611119617A CN106646123B CN 106646123 B CN106646123 B CN 106646123B CN 201611119617 A CN201611119617 A CN 201611119617A CN 106646123 B CN106646123 B CN 106646123B
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China
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transmission line
electricity
voltage
zero
residual voltage
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CN106646123A (en
Inventor
谢华
赵青春
陆金凤
张洪喜
沈军
王玉龙
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NR Electric Co Ltd
NR Engineering Co Ltd
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NR Electric Co Ltd
NR Engineering Co Ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08Locating faults in cables, transmission lines, or networks
    • G01R31/081Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/085Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08Locating faults in cables, transmission lines, or networks
    • G01R31/088Aspects of digital computing

Abstract

A kind of transmission line of electricity broken string area judging method that the present invention discloses relatively residual voltage acquires this side three-phase current of transmission line of electricity and three-phase voltage when judging that power grid has disconnection fault near transmission line of electricity first;Calculate this side zero-sequence current and this side residual voltage;Further according to this side zero-sequence current and this side residual voltage being calculated, if calculating, the opposite side zero sequence virtual voltage in the transmission line of electricity does not occur for broken string, and sends the zero sequence virtual voltage to opposite side, while receiving this side zero sequence virtual voltage that opposite side is sent;Compare this side residual voltage and this side zero sequence virtual voltage that opposite side is sent, broken string region is differentiated according to criterion.Such method of discrimination facilitates in heavy current grounding system, and relay protection selectively cuts off disconnection fault.

Description

A kind of transmission line of electricity broken string area judging method of relatively residual voltage
Technical field
The invention belongs to field of relay protection in power, in particular to a kind of transmission line of electricity broken string of relatively residual voltage Area judging method.
Background technique
In heavy current grounding system, transmission line of electricity is single-phase or two-phase broken string belongs to disconnected phase state, it is formed with short circuit Short circuits are different, belong to open conductors.Although disconnection fault is serious without short trouble, also rotating electric machine and system are transported Capable and relay protection has certain influence.If disconnection fault cannot effectively be cut off, route will be in non-full-operating state, appearance Negative phase-sequence, zero-sequence current may cause relay protection of power system leapfrog movement, and scope of power outage is caused to expand.
In the line protective devices of external certain producers, it is configured with the element of circuit breaking monitoring function.When multistage line When disconnection fault occurs for a certain transmission line of electricity in road, more than one route may determine that disconnection fault occurs for system, but single Pure circuit breaking monitoring function element is but not easy to position the specific location of disconnection fault, and relay protection can not accomplish there is selection Property cut off faulty line, keep scope of power outage minimum.Therefore, it is necessary to further investigate to this problem, transmission line of electricity is proposed The method of discrimination in broken string region.
This case is based on the above demand and generates.
Summary of the invention
The purpose of the present invention is to provide a kind of transmission line of electricity broken string area judging method of relatively residual voltage, help In in heavy current grounding system, relay protection selectively cuts off disconnection fault.
In order to achieve the above objectives, solution of the invention is:
A kind of transmission line of electricity broken string area judging method of relatively residual voltage, includes the following steps:
Step 1, this side three-phase current of transmission line of electricity and three-phase voltage are acquired;
Step 2, this side zero-sequence current and this side residual voltage are calculated;
Step 3, this side zero-sequence current and this side residual voltage being calculated according to step 2, if calculating, broken string does not occur The opposite side zero sequence virtual voltage in the transmission line of electricity, and the zero sequence virtual voltage is sent to opposite side, while receiving what opposite side was sent This side zero sequence virtual voltage;
Step 4, compare this side residual voltage and this side zero sequence virtual voltage that opposite side is sent, broken string area is differentiated according to criterion Domain.
In above-mentioned steps 2, this side zero-sequence currentCalculation formula be:
Wherein,Respectively this side three-phase current of transmission line of electricity.
In above-mentioned steps 2, this side residual voltageCalculation formula be:
Wherein,Respectively this side three-phase voltage of transmission line of electricity.
In above-mentioned steps 3, the calculation formula of opposite side zero sequence virtual voltage is:
Wherein, Z1L0For power transmission line zero-sequence impedance,For this side residual voltage,For this side zero-sequence current,The opposite side zero sequence virtual voltage calculated for this side.
In above-mentioned steps 4, the content of criterion is:IfThen determine that broken string occurs in the power transmission line Road;Otherwise, it is determined that broken string is occurred in the transmission line of electricity;Wherein,For this side residual voltage,It is sent for opposite side This side zero sequence virtual voltage, UsetFor criterion threshold value, | | to take amplitude operation.
If the difference for this side zero sequence virtual voltage that this side residual voltage and opposite side are sent is sentenced no more than criterion threshold value Fixed broken string is occurred in the transmission line of electricity;If this side residual voltage and the difference for this side zero sequence virtual voltage that opposite side is sent are big In criterion threshold value, then determine that broken string occurs in the transmission line of electricity.
Before above-mentioned steps 1, first judging transmission line of electricity, nearby whether there is or not disconnection faults for power grid, near transmission line of electricity determines When power grid has disconnection fault, then carry out step 1.
After adopting the above scheme, this side zero sequence that the present invention is sent by comparing this side residual voltage and opposite side is virtually electric Pressure accurately differentiates the region that disconnection fault is occurred, facilitates in heavy current grounding system, relay protection is selectively Cut off disconnection fault.
Detailed description of the invention
Fig. 1 is general flow chart of the invention;
Fig. 2 is specific flow chart of the invention.
Specific embodiment
Below with reference to attached drawing, technical solution of the present invention is described in detail.
As depicted in figs. 1 and 2, the present invention provides a kind of transmission line of electricity broken string area judging method of relatively residual voltage, When transmission line of electricity, which determines neighbouring power grid, disconnection fault, following steps are carried out:
Step 1, this side three-phase current of transmission line of electricity is acquiredThree-phase voltageAnd Opposite side three-phase currentThree-phase voltage
Step 2, the data acquired according to step 1, calculate separately the zero-sequence current and residual voltage of route two sides:
This side zero-sequence current
This side residual voltage
Opposite side zero-sequence current
Opposite side residual voltage
Step 3, this side zero-sequence current and this side residual voltage that transmission line of electricity two sides are calculated according to step 2 respectively, If calculating, the opposite side zero sequence virtual voltage in the transmission line of electricity does not occur for broken string, and sends the zero sequence virtual voltage to opposite side, together When receive this side zero sequence virtual voltage for sending of opposite side;
Wherein, by taking this side as an example, the calculation formula of this side zero sequence virtual voltage is:
Wherein, Z1L0For power transmission line zero-sequence impedance,For this side residual voltage,For this side zero-sequence current,The opposite side zero sequence virtual voltage calculated for this side.
Step 4, compare this side residual voltage and this side zero sequence virtual voltage that opposite side is sent, differentiated according to following criterion disconnected Line region:If this side zero sequence virtual voltage that this side residual voltage is sent close to opposite side, determining broken string not is occurred at this Transmission line of electricity;If this side residual voltage keeps off this side zero sequence virtual voltage sent in opposite side, determine that broken string occurs at this Transmission line of electricity.
That is, ifThen determine that broken string occurs in the transmission line of electricity,
Wherein,For this side zero sequence virtual voltage that opposite side is sent, UsetFor criterion threshold value, | | to take amplitude to transport It calculates.
The above examples only illustrate the technical idea of the present invention, and this does not limit the scope of protection of the present invention, all According to the technical idea provided by the invention, any changes made on the basis of the technical scheme each falls within the scope of the present invention Within.

Claims (5)

  1. A kind of area judging method 1. transmission line of electricity of relatively residual voltage breaks, it is characterised in that include the following steps:
    Step 1, this side three-phase current of transmission line of electricity and three-phase voltage are acquired;
    Step 2, this side zero-sequence current and this side residual voltage are calculated;
    Step 3, this side zero-sequence current and this side residual voltage being calculated according to step 2, if calculating, broken string does not occur at this Zero sequence virtual voltage in opposite side when transmission line of electricity, and the zero sequence virtual voltage is sent to opposite side, while receiving this side that opposite side is sent Zero sequence virtual voltage;
    Step 4, compare this side residual voltage and this side zero sequence virtual voltage that opposite side is sent, broken string region is differentiated according to criterion;
    In the step 4, the content of criterion is:IfThen determine that broken string occurs in the transmission line of electricity;It is no Then, determining broken string not is occurred in the transmission line of electricity;Wherein,For this side residual voltage,The sheet sent for opposite side Side zero sequence virtual voltage, UsetFor criterion threshold value, | | to take amplitude operation.
  2. The area judging method 2. a kind of transmission line of electricity of relatively residual voltage as described in claim 1 breaks, it is characterised in that: In the step 2, this side zero-sequence currentCalculation formula be:
    Wherein,Respectively this side three-phase current of transmission line of electricity.
  3. The area judging method 3. a kind of transmission line of electricity of relatively residual voltage as described in claim 1 breaks, it is characterised in that: In the step 2, this side residual voltageCalculation formula be:
    Wherein,Respectively this side three-phase voltage of transmission line of electricity.
  4. The area judging method 4. a kind of transmission line of electricity of relatively residual voltage as described in claim 1 breaks, it is characterised in that: In the step 3, the calculation formula of opposite side zero sequence virtual voltage is:
    Wherein, Z1L0For power transmission line zero-sequence impedance,For this side residual voltage,For this side zero-sequence current,For The opposite side zero sequence virtual voltage that this side calculates.
  5. The area judging method 5. a kind of transmission line of electricity of relatively residual voltage as described in claim 1 breaks, it is characterised in that: Before the step 1, first judge transmission line of electricity nearby power grid whether there is or not disconnection fault, when transmission line of electricity determine power grid nearby have it is disconnected When line failure, then carry out step 1.
CN201611119617.0A 2016-12-08 2016-12-08 A kind of transmission line of electricity broken string area judging method of relatively residual voltage Active CN106646123B (en)

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CN107394755A (en) * 2017-06-30 2017-11-24 南京南瑞继保电气有限公司 A kind of guard method for avoiding the unordered action of transmission line of electricity broken string
CN107367669A (en) * 2017-07-12 2017-11-21 南京南瑞继保电气有限公司 The method that broken string transmission line of electricity is locked based on negative sequence network
CN107390076A (en) * 2017-07-12 2017-11-24 南京南瑞继保电气有限公司 The method that broken string transmission line of electricity is locked using negative sequence voltage
CN110082644A (en) * 2019-05-23 2019-08-02 国电南瑞科技股份有限公司 Relay protection circuit CT broken string recognition methods and fault positioning method for transmission line

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