CN116316471A - High-voltage line protection device and protection method integrating protection function of reactor - Google Patents
High-voltage line protection device and protection method integrating protection function of reactor Download PDFInfo
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- CN116316471A CN116316471A CN202310065777.5A CN202310065777A CN116316471A CN 116316471 A CN116316471 A CN 116316471A CN 202310065777 A CN202310065777 A CN 202310065777A CN 116316471 A CN116316471 A CN 116316471A
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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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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00016—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus
- H02J13/00017—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus using optical fiber
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
- H02J13/0004—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers involved in a protection system
Abstract
The invention discloses a high-voltage line protection device and a protection method integrating a protection function of a reactor, wherein a high-voltage line is erected between transformer substations on two sides, each transformer substation is provided with a collection module, a circuit breaker and a reactor, and the reactor comprises a main reactor and a neutral point reactor which are connected in series; the high-voltage line end is connected to a bus of the transformer substation through a circuit breaker, and is grounded through a reactor; the acquisition module is used for acquiring a head end current value and a tail end voltage value of the circuit breaker, and a head end current value and a tail end current value of the main reactor; the two protection devices are connected with each other and perform information interaction, each protection device is connected to the acquisition module and the circuit breaker of each transformer substation, and is used for acquiring the acquisition information of the acquisition module and the position information of the circuit breaker and controlling the on-off of the circuit breaker based on a protection method; the invention realizes the physical integration and information fusion of the circuit protection and the reactor protection, reduces the complexity of the whole secondary system and improves the relay protection reliability.
Description
Technical Field
The invention relates to a high-voltage line protection device and a protection method integrating a reactor protection function, and belongs to the technical field of relay protection.
Background
The relay protection device is an important component part of the power system and is one of important measures for protecting the safe operation of the power system. Unlike on-land substations, offshore booster stations have small platform space, more compact equipment space, and in addition, offshore maintenance is more difficult, requiring simpler and more reliable equipment and circuits. The existing offshore wind power protection configuration uses a land transformer substation scheme, the types of protection devices are many, the operation and maintenance flow is complex, and the cost is high, so that the research of a special relay protection configuration scheme aiming at the characteristics of the offshore wind power is urgently needed to be developed, the relay protection performance is improved, and the safe and efficient operation of the offshore wind power is ensured.
The existing protection configuration scheme on the offshore wind power transmission line adopts a land transformer station scheme, and a line protection device and a reactor protection device are respectively and independently configured, so that the occupied space is large, the loop matching is complex, and the design construction and maintenance of offshore wind power are not facilitated; meanwhile, the electric quantity information acquired by the circuit protection and the reactor protection cannot be shared from the technical level, so that the circuit protection needs to estimate the current flowing through the reactor through complex iterative operation, transient components at the initial stage of the fault are often not accurate enough, and the accurate judgment of the differential protection is further affected; for the protection of the reactor, the state of the circuit breaker on the opposite side cannot be known, and the RLC oscillation current often causes turn-to-turn protection misoperation when the line is out of operation or is empty and charged.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a high-voltage line protection device and a protection method for integrating the protection function of a reactor, which realize the physical integration and information fusion of line protection and reactor protection, reduce the complexity of the whole secondary system and improve the relay protection reliability.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
in a first aspect, the invention provides a high-voltage line protection device integrating a protection function of a reactor, wherein the high-voltage line is erected between transformer substations on two sides, each transformer substation is provided with an acquisition module, a circuit breaker and a reactor, and the reactor comprises a main reactor and a neutral point reactor which are connected in series; the high-voltage line end is connected to a bus of the transformer substation through a circuit breaker, and is grounded through a reactor; the acquisition module is used for acquiring a head end current value and a tail end voltage value of the circuit breaker, and a head end current value and a tail end current value of the main reactor; the two protection devices are connected with each other and conduct information interaction, each protection device is connected to the output end of the acquisition module of each transformer substation and the signal end and the control end of the circuit breaker, and the protection device is used for acquiring the head end current value and the tail end voltage value of the circuit breaker, the head end current value and the tail end current value of the main reactor and the position information of the circuit breaker, which are acquired by the acquisition module, and controlling the on-off of the circuit breaker.
Optionally, the acquisition module comprises a first current transformer, a second current transformer, a third current transformer and a voltage transformer; primary sides of the first current transformer and the voltage transformer are respectively connected to the head end and the tail end of the circuit breaker, and primary sides of the second current transformer and the third current transformer are respectively connected to the head end and the tail end of the main reactor; the secondary sides of the first current transformer, the second current transformer, the third current transformer and the voltage transformer are all connected to the protection device.
Optionally, the two protection devices are connected with each other through optical fibers and a ping-pong synchronization algorithm is adopted to ensure the data synchronization of the two protection devices, so that information interaction is realized.
In a second aspect, the present invention provides a high-voltage line protection method integrating a protection function of a reactor, based on the protection device, including:
acquiring the sensing data of the side and the opposite side acquired by the side and the opposite side protection components, and judging whether the sensing data of the side and the opposite side meet any preset starting element or not;
if any starting element is met, judging whether the sensing data of the side and the opposite side meet the preset fault protection or not;
if the fault protection is met, generating faults, and determining that the faults are faults in the circuit area or faults in the reactor area according to the met fault protection;
if the circuit is in the fault in the circuit area, tripping the circuit breakers on the side and the opposite side, judging whether to allow the circuit reclosing input, if so, closing the circuit breakers on the side and the opposite side by the circuit reclosing action, and if not, closing the circuit reclosing;
and if the fault is in the reactor zone, tripping the side and opposite side circuit breakers and locking the line to reclose.
Optionally, the starting element comprises a current abrupt starting element, a zero sequence current starting element, a reactor differential current abrupt starting element and a reactor auxiliary starting element.
Optionally, the current abrupt amount starting element satisfies the following conditions: any one of the head end current value of the circuit breaker, the head end current value and the tail end current value of the main reactor meets the following conditions:
|[i m.Φ (k)-i m.Φ (k-n)]-[i m.Φ (k-n)-i m.Φ (k-2n)]|≥I m.ε
wherein i is m.Φ (k)、i m.Φ (k-n)、i m.Φ (k-2 n) is the current value at the time of k, k-n, k-2n respectively
n is the period of the traffic of the power system, I m.ε Starting a threshold for the current abrupt change, wherein phi=A, B and C are phases A, B and C, and m=1, 2 and 3 are the head end of the circuit breaker, the head end and the tail end of the main reactor;
the zero sequence current starting element meets the following conditions: any one of the head end current value of the circuit breaker, the head end current value and the tail end current value of the main reactor meets the following conditions:
3I m.0 >3I m.0Qd
in the formula, 3I m.0 The value is zero sequence current value
Is, +.>
3I m.0Qd Starting a fixed value for the zero sequence current;
the reactor differential current abrupt change starting element meets the following conditions:
|[i d.Φ (k)-i d.Φ (k-n)]-[i d.Φ (k-n)-i d.Φ (k-2n)]|≥I ε
wherein i is d.Φ (k)、i d.Φ (k-n)、i d.Φ (k-2 n) is the sum of the current values of the head end and the tail end of the main reactor at the moments of k, k-n and k-2n, i d.Φ (k)＝i 2.Φ (k)+i 3.Φ (k),i d.Φ (k-n)＝i 2.Φ (k-n)+i 3.Φ (k-n),i d.Φ (k-2n)＝i 2.Φ (k-2n)+i 3. Φ(k-2n)，I ε Starting a threshold for the reactor differential current abrupt quantity;
the auxiliary starting element of the reactor meets the following conditions: either one of the first condition and the second condition is satisfied:
condition one:
I d.Φ >I d.QdSet
condition II:
3I d.0 >I d.QdSet
wherein I is d.Φ Is the magnitude of the current vector sum of the head end and the tail end of the main reactor,
3I d.0 is the amplitude of the zero sequence current vector sum of the head end and the tail end of the main reactor, +.>
I dQdSet The threshold is started for the differential current of the reactor.
Optionally, the fault protection comprises line longitudinal differential protection, line distance protection, line zero sequence overcurrent protection, reactor differential protection, turn-to-turn protection, main reactance overcurrent protection, main reactance zero sequence overcurrent protection and neutral point reactor overcurrent protection.
Optionally, the action conditions of the line longitudinal differential protection are as follows:
wherein Φ=A, B, C is A, B, C phase, I' d.Φ The value of the steady-state differential current is the amplitude of the vector sum of steady-state phase currents at two sides of the high-voltage line,
I re·Φ the value of the steady-state braking current is the amplitude value of the steady-state phase current vector difference at the two sides of the high-voltage line,/>
The phase current vector difference of the front ends of the circuit breakers at the two sides of the high-voltage line and the front end of the main reactor is respectively; p is the ratio brake coefficient; i mk The differential current action of the high-voltage line is fixed;
the action conditions of the line distance protection are as follows: the grounding distance impedance or the inter-phase distance impedance satisfies a preset action range, and the grounding distance impedance
The method comprises the following steps:
wherein Z is 0 、Z 1 The zero sequence impedance and the positive sequence impedance of the high-voltage circuit are respectively; kz is zero sequence current compensation coefficient, 3I 1.0 Is the head end zero sequence current value of the breaker,
the current value is the head end current value and the tail end voltage value of the circuit breaker;
the phase-to-phase impedance
The method comprises the following steps:
wherein Φ=ab, BC, CA is AB, BC, CA is interphase,
the phase-to-phase current value and the voltage value of the head end of the circuit breaker;
the action conditions of the zero sequence overcurrent protection of the circuit are as follows:
3I 1.0 >I set1
in the formula, 3I 1.0 Is the head end zero sequence current value of the breaker, I set1 A zero sequence overcurrent fixed value is set for the head end of the circuit breaker;
the operation conditions of the differential protection of the reactor are as follows: the differential equation or the differential quick-break protection equation meets the preset action condition, and the differential equation is as follows:
wherein I is d.Φ Is the magnitude of the current vector sum of the head end and the tail end of the main reactor,
I dQdSet for the reactor differential current starting threshold, p'For braking coefficient, I' reΦ For braking current, +.>
The differential quick-break protection equation is as follows:
I d·Φ >I cdsdmk
wherein I is cdsdmk Setting a value for differential quick-break protection;
the action conditions of the inter-turn protection are as follows:
175°≤arg(3U 1.0 /3I 2.0 )≤325°
in 3U 1.0 For the end zero sequence voltage value of the circuit breaker,
3I 2.0 the zero sequence current value of the head end of the main reactor is +.>
For the end voltage value and the rated voltage value of the circuit breaker, < >>
The current value and the rated current value of the head end of the main reactor;
the action conditions of the main reactance overcurrent protection are as follows:
in the method, in the process of the invention,
the primary current value of the primary reactor, I set2 The method comprises the steps of overcurrent setting value for the head end of a main reactor;
the action conditions of the main reactance zero sequence overcurrent protection are as follows:
3I 2.0 >I set3
wherein I is set3 The zero sequence overcurrent constant value is the head end of the main reactor;
the action conditions of the neutral point reactor overcurrent protection are as follows:
wherein I is set4 The value is fixed for the head end overcurrent of the neutral point reactor.
Optionally, the determining that the fault is a fault in the line area or a fault in the reactor area according to the satisfied fault protection includes:
if the satisfied fault protection is at least one of line longitudinal differential protection, line distance protection and line zero sequence overcurrent protection, the fault is a fault in a line area;
and if the satisfied fault protection is at least one of reactor differential protection, turn-to-turn protection, main reactance overcurrent protection, main reactance zero sequence overcurrent protection and neutral point reactor overcurrent protection, the fault is a fault in a reactor zone.
Optionally, the conditions for allowing the line reclosing to be put in include:
when a single mode is put into operation, if the line longitudinal differential protection, the line distance protection or the line zero sequence overcurrent protection action is performed, judging that the high-voltage line has single-phase faults and sending out a single phase of the tripping circuit breaker, wherein the position information of the single phase is separated and the current is less than 0.04I 1n ，
Rated current value of the head end of the main reactor;
when the triple mode is put into operation, if the line longitudinal differential protection, the line distance protection or the line zero sequence overcurrent protection action occurs, the high-voltage line generates unidirectional/multiphase faults and sends out three phases of the tripping circuit breaker, and the position information of the three phases is divided into three phases with current less than 0.04I 1n 。
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a high-voltage line protection device integrating a reactor protection function and a protection method thereof, wherein a protection component is arranged on the side and the opposite side, so that the head end current value and the tail end voltage value of a circuit breaker, the head end current value and the tail end current value of a main reactor and the position information of the circuit breaker are respectively collected, and information interaction is carried out, thereby realizing the physical integration and information fusion of line protection and reactor protection, and reducing the complexity of the whole secondary system; the fault area is searched through the judgment of the starting element and the fault protection, and the protection action is carried out, so that the relay protection reliability is improved; the invention reduces the occupied area of the platform of the offshore booster station and reduces the secondary equipment investment in the offshore wind power construction while optimizing the overall performance of the lifting device. For the power transmission line with the shunt reactor of the land transformer substation, the scheme is still applicable.
Drawings
Fig. 1 is a schematic diagram of a high-voltage line protection device with integrated reactor protection function according to an embodiment of the present invention;
fig. 2 is a flowchart of a high-voltage line protection method integrating a protection function of a reactor according to a second embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical solution of the invention and are not intended to limit the scope of protection of the invention.
Embodiment one:
the embodiment of the invention provides a high-voltage line protection device integrating a protection function of a reactor, wherein a high-voltage line is erected between two side substations (namely a primary side substation and a secondary side substation), each side of the substation is provided with a collection module, a circuit breaker and a reactor, and the reactor comprises a main reactor and a neutral point reactor which are connected in series; the high-voltage line end is connected to a bus of the transformer substation through a circuit breaker, and is grounded through a reactor; the acquisition module is used for acquiring a head end current value and a tail end voltage value of the circuit breaker, and a head end current value and a tail end current value of the main reactor; the two protection devices are connected with each other and conduct information interaction, each protection device is connected to the output end of the acquisition module of each transformer substation and the signal end and the control end of the circuit breaker, and the protection device is used for acquiring the head end current value and the tail end voltage value of the circuit breaker, the head end current value and the tail end current value of the main reactor and the position information of the circuit breaker, which are acquired by the acquisition module, and controlling the on-off of the circuit breaker.
As shown in fig. 1, the present embodiment provides a schematic diagram of a high-voltage line protection device with integrated reactor protection function:
(1) The side transformer substation is provided with a side breaker BRK 1 The system comprises a main reactor at the side, a neutral point reactor at the side and a collecting module at the side, wherein the collecting module at the side comprises a first current transformer CT 1 CT of the second current transformer 2 CT of third current transformer 3 Potential transformer PT 1 The method comprises the steps of carrying out a first treatment on the surface of the First current transformer CT 1 And a potential transformer PT 1 Is connected to the circuit breaker BRK respectively 1 The head end and the tail end of the second current transformer CT 2 And a third current transformer CT 3 Is connected to the head end and the tail end of the main reactor respectively; first current transformer CT 1 CT of the transformer, second current transformer 2 CT of third current transformer 3 Potential transformer PT 1 The secondary sides of the two-way valve are connected to the primary side protection device; the side protection devices are also respectively connected to the circuit breakers BRK 1 A signal terminal and a control terminal.
(2) The opposite side transformer substation is provided with an opposite side breaker BRK 2 The contralateral main reactor, the contralateral neutral point reactor and the contralateral acquisition module comprise a first current transformer CT 4 CT of the second current transformer 5 CT of third current transformer 6 Potential transformer PT 2 The method comprises the steps of carrying out a first treatment on the surface of the First current transformer CT 4 And a potential transformer PT 2 Is connected to the circuit breaker BRK respectively 2 The head end and the tail end of the second current transformer CT 5 And a third current transformer CT 6 Is connected to the primary side of the primary reactance respectivelyA head end and a tail end of the device; first current transformer CT 4 CT of the transformer, second current transformer 5 CT of third current transformer 6 Potential transformer PT 2 Is connected to the opposite side protection device; the opposite side protection devices are also respectively connected to the circuit breaker BRK 2 A signal terminal and a control terminal.
(3) The two side protection devices are connected with each other through optical fibers, and the data synchronization of the two side protection devices is guaranteed by adopting a ping-pong synchronization algorithm, so that information interaction is realized.
Embodiment two:
as shown in fig. 2, the present invention provides a high-voltage line protection method integrating a protection function of a reactor, and the protection device provided based on the first embodiment includes the following steps:
1. acquiring the sensing data of the side and the opposite side acquired by the side and the opposite side protection components, and judging whether the sensing data of the side and the opposite side meet any preset starting element or not;
1.1, the local side sensing data comprises: circuit breaker BRK 1 Is the head-end current value of (2)
And terminal voltage value>
Head-end current value of main reactor +.>
And terminal current value->
Circuit breaker BRK 1 Is provided.
1.2, contralateral sensory data comprises: circuit breaker BRK 2 Is the head-end current value of (2)
And terminal voltage value>
Head-end current value of main reactor +.>
And terminal current value->
Circuit breaker BRK 2 Is provided.
1.3, the starting element comprises a current abrupt starting element, a zero sequence current starting element, a reactor differential current abrupt starting element and a reactor auxiliary starting element;
taking the present side sensor data (m=1, 2, 3) as an example:
(1) The current abrupt amount starting element satisfies the following conditions: any one of the head end current value of the circuit breaker, the head end current value and the tail end current value of the main reactor meets the following conditions:
|[i m.Φ (k)-i m.Φ (k-n)]-[i m.Φ (k-n)-i m.Φ (k-2n)]|≥I m.ε
wherein i is m.Φ (k)、i m.Φ (k-n)、i m.Φ (k-2 n) is the current value at the time of k, k-n, k-2n respectively
n is the period of the traffic of the power system, I m.ε Starting a threshold for the current abrupt change, wherein phi=A, B and C are phases A, B and C, and m=1, 2 and 3 are the head end of the circuit breaker, the head end and the tail end of the main reactor;
(2) The zero sequence current starting element meets the following conditions: any one of the head end current value of the circuit breaker, the head end current value and the tail end current value of the main reactor meets the following conditions:
3I m.0 >3I m.0Qd
in the formula, 3I m.0 The value is zero sequence current value
Is, +.>
3I m.0Qd Is zero sequence currentStarting a fixed value;
(3) The satisfaction conditions of the reactor differential current abrupt change starting element are as follows:
|[i d.Φ (k)-i d.Φ (k-n)]-[i d.Φ (k-n)-i d.Φ (k-2n)]|≥I ε
wherein i is d.Φ (k)、i d.Φ (k-n)、i d.Φ (k-2 n) is the sum of the current values of the head end and the tail end of the main reactor at the moments of k, k-n and k-2n, i d.Φ (k)＝i 2.Φ (k)+i 3.Φ (k),i d.Φ (k-n)＝i 2.Φ (k-n)+i 3.Φ (k-n),i d.Φ (k-2n)＝i 2.Φ (k-2n)+i 3.Φ (k-2n)，I ε Starting a threshold for the reactor differential current abrupt quantity;
(4) The auxiliary starting element of the reactor meets the following conditions: either one of the first condition and the second condition is satisfied:
condition one:
I d.Φ >I d.QdSet
condition II:
3I d.0 >I d.QdSet
wherein I is d.Φ Is the magnitude of the current vector sum of the head end and the tail end of the main reactor,
3I d.0 is the amplitude of the zero sequence current vector sum of the head end and the tail end of the main reactor, +.>
I dQdSet The threshold is started for the differential current of the reactor.
2. If any starting element is met, judging whether the sensing data of the side and the opposite side meet the preset fault protection or not; the fault protection comprises line longitudinal differential protection, line distance protection, line zero sequence overcurrent protection, reactor differential protection, turn-to-turn protection, main reactance overcurrent protection, main reactance zero sequence overcurrent protection and neutral point reactor overcurrent protection;
(1) The action conditions of the longitudinal differential protection of the circuit are as follows:
wherein Φ=A, B, C is A, B, C phase, I' d.Φ The value of the steady-state differential current is the amplitude of the vector sum of steady-state phase currents at two sides of the high-voltage line,
I re·Φ the value of the steady-state braking current is the amplitude value of the steady-state phase current vector difference at the two sides of the high-voltage line,/>
Phase current vector difference of the head ends of the circuit breakers at two sides of the high-voltage line and the head end of the main reactor respectively>
p is the ratio brake coefficient, typically taking 0.6; i mk The differential current action of the high-voltage line is fixed;
(2) The action conditions of the line distance protection are as follows: the grounding distance impedance or the inter-phase distance impedance meets the preset action range, and the grounding distance impedance
The method comprises the following steps:
wherein Z is 0 、Z 1 The zero sequence impedance and the positive sequence impedance of the high-voltage circuit are respectively; kz is zero sequence current compensation coefficient, 3I 1.0 Is the head end zero sequence current value of the breaker,
the current value is the head end current value and the tail end voltage value of the circuit breaker;
phase-to-phase distance impedance
The method comprises the following steps:
wherein Φ=ab, BC, CA is AB, BC, CA is interphase,
the phase-to-phase current value and the voltage value of the head end of the circuit breaker; />
(3) The action conditions of the zero sequence overcurrent protection of the circuit are as follows:
3I 1.0 >I set1
in the formula, 3I 1.0 Is the head end zero sequence current value of the breaker, I set1 A zero sequence overcurrent fixed value is set for the head end of the circuit breaker;
(4) The operation conditions of the differential protection of the reactor are as follows: the differential equation or the differential quick-break protection equation meets the preset action condition, and the differential equation is as follows:
wherein I is d.Φ Is the magnitude of the current vector sum of the head end and the tail end of the main reactor,
I dQdSet differential power for reactorThe flow-on threshold, p 'is the braking coefficient, typically 0.6, I' re·Φ In order to brake the current flow,
the differential quick-break protection equation is:
I d·Φ >I cdsdmk
wherein I is cdsdmk Setting a value for differential quick-break protection;
(5) The action conditions of the inter-turn protection are as follows:
175°≤arg(3U 1.0 /3I 2.0 )≤325°
in 3U 1.0 For the end zero sequence voltage value of the circuit breaker,
3I 2.0 the zero sequence current value of the head end of the main reactor is +.>
For the end voltage value and the rated voltage value of the circuit breaker, < >>
The current value and the rated current value of the head end of the main reactor;
(6) The action conditions of the main reactance overcurrent protection are as follows:
in the method, in the process of the invention,
the primary current value of the primary reactor, I set2 The method comprises the steps of overcurrent setting value for the head end of a main reactor;
(7) The action conditions of the main reactance zero sequence overcurrent protection are as follows:
3I 2.0 >I set3
wherein I is set3 The zero sequence overcurrent constant value is the head end of the main reactor;
(8) The operation conditions of the over-current protection of the neutral point reactor are as follows:
wherein I is set4 The value is fixed for the head end overcurrent of the neutral point reactor.
3. If the fault protection is met, generating faults, and determining that the faults are faults in the circuit area or faults in the reactor area according to the met fault protection;
if the satisfied fault protection is at least one of line longitudinal differential protection, line distance protection and line zero sequence overcurrent protection, the fault is a fault in a line area;
and if the satisfied fault protection is at least one of reactor differential protection, turn-to-turn protection, main reactance overcurrent protection, main reactance zero sequence overcurrent protection and neutral point reactor overcurrent protection, the fault is a fault in a reactor zone.
4. If the circuit is in the fault in the circuit area, tripping the circuit breakers on the side and the opposite side, judging whether to allow the circuit reclosing input, if so, closing the circuit breakers on the side and the opposite side by the circuit reclosing action, and if not, closing the circuit reclosing;
the conditions for line reclosing permission input include:
when the single mode is put into operation, if the line longitudinal differential protection, the line distance protection or the line zero sequence overcurrent protection action is performed, judging that the high-voltage line has single-phase faults and sending out a single phase of the tripping circuit breaker, wherein the single-phase position information is separated and the current is less than 0.04I 1n ；
When the triple mode is put into operation, if the longitudinal differential protection, the distance protection or the zero sequence overcurrent protection action of the circuit occur, the high-voltage line fails unidirectionally/multiphasally and breaks out the three phases of the breakerThe position information of (a) is divided into the following parts and the current is less than 0.04I 1n 。
5. If the fault is in the reactor zone, tripping the side and opposite side circuit breakers and locking the circuit to reclose, wherein the method specifically comprises the following steps:
if the fault is in the region of the reactor on the side, tripping the breaker on the side and locking the reclosing of the line on the side, and simultaneously sending a far tripping signal to trip the breaker on the side and locking the reclosing of the line on the side through the optical fiber channel;
if the fault is in the region of the opposite side reactor, the opposite side circuit breaker is tripped and the opposite side circuit reclosing is locked, and meanwhile, a far tripping signal is sent through the optical fiber channel to trip the opposite side circuit breaker and the opposite side circuit reclosing is locked.
It will be apparent to those skilled in the art that embodiments of the application may be provided as a method, system, or computer program product. Thus, the application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the subject application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk memory, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The subject application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the subject application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While the foregoing is directed to the preferred embodiments of the present invention, it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (10)
1. The high-voltage line protection device integrating the protection function of the reactor is characterized in that the high-voltage line is erected between substations on two sides, each side of the substation is provided with an acquisition module, a circuit breaker and a reactor, and the reactor comprises a main reactor and a neutral point reactor which are connected in series; the high-voltage line end is connected to a bus of the transformer substation through a circuit breaker, and is grounded through a reactor; the acquisition module is used for acquiring a head end current value and a tail end voltage value of the circuit breaker, and a head end current value and a tail end current value of the main reactor; the two protection devices are connected with each other and conduct information interaction, each protection device is connected to the output end of the acquisition module of each transformer substation and the signal end and the control end of the circuit breaker, and the protection device is used for acquiring the head end current value and the tail end voltage value of the circuit breaker, the head end current value and the tail end current value of the main reactor and the position information of the circuit breaker, which are acquired by the acquisition module, and controlling the on-off of the circuit breaker.
2. The high-voltage line protection device integrated with a reactor protection function according to claim 1, wherein the acquisition module comprises a first current transformer, a second current transformer, a third current transformer and a voltage transformer; primary sides of the first current transformer and the voltage transformer are respectively connected to the head end and the tail end of the circuit breaker, and primary sides of the second current transformer and the third current transformer are respectively connected to the head end and the tail end of the main reactor; the secondary sides of the first current transformer, the second current transformer, the third current transformer and the voltage transformer are all connected to the protection device.
3. The high-voltage line protection device integrated with the protection function of the reactor according to claim 1, wherein the two protection devices are connected with each other through optical fibers and a ping-pong synchronization algorithm is adopted to ensure the data synchronization of the two protection devices, so that information interaction is realized.
4. A high-voltage line protection method integrating a reactor protection function, characterized by comprising, based on the protection device of any one of claims 1-3:
acquiring the sensing data of the side and the opposite side acquired by the side and the opposite side protection components, and judging whether the sensing data of the side and the opposite side meet any preset starting element or not;
if any starting element is met, judging whether the sensing data of the side and the opposite side meet the preset fault protection or not;
if the fault protection is met, generating faults, and determining that the faults are faults in the circuit area or faults in the reactor area according to the met fault protection;
if the circuit is in the fault in the circuit area, tripping the circuit breakers on the side and the opposite side, judging whether to allow the circuit reclosing input, if so, closing the circuit breakers on the side and the opposite side by the circuit reclosing action, and if not, closing the circuit reclosing;
and if the fault is in the reactor zone, tripping the side and opposite side circuit breakers and locking the line to reclose.
5. The method according to claim 4, wherein the starting element comprises a current abrupt starting element, a zero sequence current starting element, a reactor differential current abrupt starting element, and a reactor auxiliary starting element.
6. The method for protecting a high-voltage line integrated with a reactor protection function according to claim 5, wherein the current abrupt amount starting element satisfies the following conditions: any one of the head end current value of the circuit breaker, the head end current value and the tail end current value of the main reactor meets the following conditions:
|[i m.Φ (k)-i m.Φ (k-n)]-[i m.Φ (k-n)-i m.Φ (k-2n)]|≥I m.ε
wherein i is m.Φ (k)、i m.Φ (k-n)、i m.Φ (k-2 n) is the current value at the time of k, k-n, k-2n respectively
n is the period of the traffic of the power system, I m.ε Starting a threshold for the current abrupt change, wherein phi=A, B and C are phases A, B and C, and m=1, 2 and 3 are the head end of the circuit breaker, the head end and the tail end of the main reactor;
the zero sequence current starting element meets the following conditions: any one of the head end current value of the circuit breaker, the head end current value and the tail end current value of the main reactor meets the following conditions:
3I m.0 >3I m.0Qd
in the formula, 3I m.0 The value is zero sequence current value
Is, +.>
3I m.0Qd Starting a fixed value for the zero sequence current;
the reactor differential current abrupt change starting element meets the following conditions:
|[i d.Φ (k)-i d.Φ (k-n)]-[i d.Φ (k-n)-i d.Φ (k-2n)]|≥I ε
wherein i is d.Φ (k)、i d.Φ (k-n)、i d.Φ (k-2 n) is the sum of the current values of the head end and the tail end of the main reactor at the moments of k, k-n and k-2n, i d.Φ (k)＝i 2.Φ (k)+i 3.Φ (k),i d.Φ (k-n)＝i 2.Φ (k-n)+i 3.Φ (k-n),i d.Φ (k-2n)＝i 2.Φ (k-2n)+i 3.Φ (k-2n)，I ε Starting a threshold for the reactor differential current abrupt quantity;
the auxiliary starting element of the reactor meets the following conditions: either one of the first condition and the second condition is satisfied:
condition one:
I d.Φ >I d.QdSet
condition II:
3I d.0 >I d.QdSet
wherein I is d.Φ Is the magnitude of the current vector sum of the head end and the tail end of the main reactor,
3I d.0 is the amplitude of the zero sequence current vector sum of the head end and the tail end of the main reactor, +.>
I dQdSet The threshold is started for the differential current of the reactor.
7. The method for protecting a high-voltage line integrated with a reactor protection function according to claim 4, wherein the fault protection comprises line longitudinal differential protection, line distance protection, line zero sequence overcurrent protection, reactor differential protection, turn-to-turn protection, main reactance overcurrent protection, main reactance zero sequence overcurrent protection and neutral point reactor overcurrent protection.
8. The method for protecting a high-voltage line with integrated reactor protection according to claim 7, wherein the operation conditions of the line longitudinal differential protection are as follows:
wherein Φ=A, B, C is A, B, C phase, I' d.Φ The value of the steady-state differential current is the amplitude of the vector sum of steady-state phase currents at two sides of the high-voltage line,
I re·Φ the value of the steady-state braking current is the amplitude value of the steady-state phase current vector difference at the two sides of the high-voltage line,/>
The phase current vector difference of the front ends of the circuit breakers at the two sides of the high-voltage line and the front end of the main reactor is respectively; p is the ratio brake coefficient; i mk The differential current action of the high-voltage line is fixed;
the action conditions of the line distance protection are as follows: the grounding distance impedance or the inter-phase distance impedance satisfies a preset action range, and the grounding distance impedance
The method comprises the following steps:
wherein Z is 0 、Z 1 The zero sequence impedance and the positive sequence impedance of the high-voltage circuit are respectively; kz is zero sequence current compensation coefficient, 3I 1.0 Is the head end zero sequence current value of the breaker,
the current value is the head end current value and the tail end voltage value of the circuit breaker;
the phase-to-phase impedance
The method comprises the following steps:
wherein Φ=ab, BC, CA is AB, BC, CA is interphase,
the phase-to-phase current value and the voltage value of the head end of the circuit breaker;
the action conditions of the zero sequence overcurrent protection of the circuit are as follows:
3I 1.0 >I set1
in the formula, 3I 1.0 Is the head end zero sequence current value of the breaker, I set1 A zero sequence overcurrent fixed value is set for the head end of the circuit breaker;
the operation conditions of the differential protection of the reactor are as follows: the differential equation or the differential quick-break protection equation meets the preset action condition, and the differential equation is as follows:
wherein I is d.Φ Is the magnitude of the current vector sum of the head end and the tail end of the main reactor,
I dQdSet the differential current of the reactor is used as a starting threshold, p 'is a braking coefficient, I' re·Φ For braking current, +.>
The differential quick-break protection equation is as follows:
I d·Φ >I cdsdmk
wherein I is cdsdmk Setting a value for differential quick-break protection;
the action conditions of the inter-turn protection are as follows:
175°≤arg(3U 1.0 /3I 2.0 )≤325°
in 3U 1.0 For the end zero sequence voltage value of the circuit breaker,
3I 2.0 the zero sequence current value of the head end of the main reactor is +.>
For the circuit breaker end voltage value and rated voltage value,
current at head end of main reactorValues and rated current values;
the action conditions of the main reactance overcurrent protection are as follows:
in the method, in the process of the invention,
the primary current value of the primary reactor, I set2 The method comprises the steps of overcurrent setting value for the head end of a main reactor;
the action conditions of the main reactance zero sequence overcurrent protection are as follows:
3I 2.0 >I set3
wherein I is set3 The zero sequence overcurrent constant value is the head end of the main reactor;
the action conditions of the neutral point reactor overcurrent protection are as follows:
wherein I is set4 The value is fixed for the head end overcurrent of the neutral point reactor.
9. The method for protecting a high-voltage line with integrated reactor protection according to claim 7, wherein the determining that the fault is a fault in the line area or a fault in the reactor area according to the satisfied fault protection comprises:
if the satisfied fault protection is at least one of line longitudinal differential protection, line distance protection and line zero sequence overcurrent protection, the fault is a fault in a line area;
and if the satisfied fault protection is at least one of reactor differential protection, turn-to-turn protection, main reactance overcurrent protection, main reactance zero sequence overcurrent protection and neutral point reactor overcurrent protection, the fault is a fault in a reactor zone.
10. The method for protecting a high-voltage line integrated with a reactor protection function according to claim 7, wherein the conditions for line reclosing permission input include:
when a single mode is put into operation, if the line longitudinal differential protection, the line distance protection or the line zero sequence overcurrent protection action is performed, judging that the high-voltage line has single-phase faults and sending out a single phase of the tripping circuit breaker, wherein the position information of the single phase is separated and the current is less than 0.04I 1n ，
Rated current value of the head end of the main reactor;
when the triple mode is put into operation, if the line longitudinal differential protection, the line distance protection or the line zero sequence overcurrent protection action occurs, the high-voltage line generates unidirectional/multiphase faults and sends out three phases of the tripping circuit breaker, and the position information of the three phases is divided into three phases with current less than 0.04I 1n 。
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| CN202310065777.5A CN116316471A (en) | 2023-01-13 | 2023-01-13 | High-voltage line protection device and protection method integrating protection function of reactor |
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