CN113036733A - Traction network power supply arm relay protection method based on directional current element - Google Patents
Traction network power supply arm relay protection method based on directional current element Download PDFInfo
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Abstract
本发明公开了一种基于方向电流元件的牵引网供电臂继电保护方法。牵引网的所亭通过断路器连接到供电臂，断路器配置馈线保护装置；馈线保护装置包括方向电流元件，馈线保护装置还构成保护单元；馈线保护装置的方向电流元件启动后跳开馈线保护装置对应的断路器并向同组保护单元的馈线保护装置发送联跳信号或闭锁信号；馈线保护装置收到联跳信号后跳开对应的断路器，收到闭锁信号后闭锁保护；方向电流元件的启动条件按照供电臂全长整定。本发明的有益效果在于，能单独保护供电臂全长；通过联跳信号弥补保护范围的不足、通过闭锁信号弥补选择性的不足，构成对供电臂的整体保护；能在故障后快速隔离故障供电臂，且不中断非故障侧供电臂的供电。
The invention discloses a relay protection method for a power supply arm of a traction network based on a directional current element. The pavilion of the traction network is connected to the power supply arm through a circuit breaker, and the circuit breaker is equipped with a feeder protection device; the feeder protection device includes a directional current element, and the feeder protection device also constitutes a protection unit; after the directional current element of the feeder protection device is activated, the feeder protection device is tripped The corresponding circuit breaker sends an inter-trip signal or blocking signal to the feeder protection device of the same group of protection units; the feeder protection device trips the corresponding circuit breaker after receiving the inter-trip signal, and blocks the protection after receiving the blocking signal; The starting conditions are set according to the full length of the power supply arm. The beneficial effect of the invention is that the full length of the power supply arm can be independently protected; the deficiency of the protection range is compensated by the jump signal, and the deficiency of the selectivity is compensated by the blocking signal, so as to constitute the overall protection of the power supply arm; the fault power supply can be quickly isolated after the fault. arm without interrupting the power supply to the non-faulty supply arm.
Description
Technical Field
The invention relates to the technical field of electrified railway power supply, in particular to a traction network power supply arm relay protection method based on a directional current element.
Background
The high-speed railway motor train unit has the characteristics of high running speed, high traction power, short departure interval and the like. The multinational high-speed railway adopts a full parallel AT power supply mode, and homonymous wires of an uplink line and a downlink line are respectively connected in parallel in a substation, an AT station and a subarea station, and the power supply mode has the advantages of reducing the unit impedance of a traction network, improving the network voltage of the traction network, improving the power supply capacity, reducing the electromagnetic interference and the like. However, when a fault occurs on a line, the relay protection has the characteristics of large fault current, multiple fault loops, complex fault current distribution and the like, all fault loops of a substation, an AT station and a subarea station need to be cut off to isolate a fault section, and the protection has the contradiction between rapidity and selectivity.
At present, when a high-speed railway traction network breaks down, the current relay protection method firstly trips a substation to protect uplink and downlink circuit breakers, and then parallel disconnection and fault isolation are realized according to a no-voltage criterion and a reclosing switch. The protection method cannot distinguish the power supply arm with the fault, the power supply arms on the upper line and the lower line must be powered off firstly when the fault is isolated, then the deficiency of protection selectivity is made up by means of reclosing, the power supply recovery time is long, and the power failure range is expanded.
In patent CN 103715670 a, "a high-speed railway power supply arm joint tripping protection method based on impedance characteristics", impedance protection with quadrilateral action characteristics is respectively configured in a substation, an AT station and a subarea, and the integral protection of the power supply arm is formed by joint tripping signals. In patent CN 103715671 a, "a high-speed railway power supply arm joint debugging protection method based on current characteristics", a current ratio criterion and an overcurrent criterion are configured in a substation, a direction overcurrent criterion is configured in an AT station and a subarea, and an integral protection for a power supply arm is formed by joint tripping signals. According to the two schemes, the power supply section from the substation to the AT substation is protected by the substation and the AT substation, the power supply section from the AT substation to the subarea substation is protected by the AT substation and the subarea substation, all the protection devices cannot independently protect the whole power supply arm, and protection is refused once communication faults occur.
Disclosure of Invention
The invention discloses a traction network power supply arm relay protection method based on a directional current element, which can quickly isolate a fault power supply arm after a fault, does not interrupt the power supply of a non-fault side power supply arm, and gives consideration to the selectivity and the quick action of protection.
The non-power supply station pavilion is provided with a circuit breaker (a single-line power supply arm) or two circuit breakers (a compound-line power supply arm), and the technical scheme of the protection method is as follows:
a power supply arm relay protection method of a traction network based on a directional current element is disclosed, wherein the traction network comprises more than two kiosks, each kiosk is connected to a power supply arm through a circuit breaker, and each circuit breaker is provided with a feeder line protection device; the feeder protection device of the circuit breaker configuration on the power supply side comprises a forward current element, and the feeder protection device of the circuit breaker configuration on the non-power supply side comprises a forward current element and a reverse current element; the forward direction points to the power supply arm for the pavilion, and the reverse direction points to the pavilion for the power supply arm; all feeder line protection devices connected with the circuit breaker configuration of the same power supply arm form a group of protection units; after a forward current element of any feeder line protection device is started and a locking signal sent by the feeder line protection devices of the same group of protection units is not received within a time delay t, tripping off a circuit breaker corresponding to the feeder line protection device and sending a joint tripping signal to the feeder line protection devices of the same group of protection units; after a reverse current element of any feeder line protection device is started, a locking signal is sent to the feeder line protection devices of the same group of protection units; after any feeder line protection device receives the joint tripping signal, tripping off a circuit breaker corresponding to the feeder line protection device; after any feeder line protection device receives the locking signal, locking protection is carried out; and the starting condition of the forward current element or the reverse current element is set according to the full length of the power supply arm.
Further, the power supply arm comprises an upstream power supply arm and a downstream power supply arm.
Only one circuit breaker is arranged on a parallel line of the non-power supply station pavilion, and the technical scheme of the protection method is as follows:
a power supply arm relay protection method of a traction network based on directional current elements is characterized in that the traction network comprises more than two stations, the power supply stations are connected to an uplink power supply arm and a downlink power supply arm through an uplink breaker and a downlink breaker respectively, parallel line breakers are arranged on parallel lines of non-power supply stations, and each breaker is provided with a feeder line protection device; the feeder line protection devices of the uplink circuit breaker and the downlink circuit breaker comprise forward current elements pointing to the power supply arm, and the feeder line protection device of the parallel circuit breaker comprises forward current elements pointing to the uplink power supply arm and reverse current elements pointing to the downlink power supply arm; the feeder line protection devices of the uplink circuit breakers and all the parallel line circuit breakers form an uplink protection unit, and the feeder line protection devices of the downlink circuit breakers and all the parallel line circuit breakers form a downlink protection unit; after a forward current element of a feeder protection device of an uplink circuit breaker is started and a locking signal sent by the feeder protection device of an uplink protection unit is not received within a time delay t, tripping off a circuit breaker corresponding to the feeder protection device and sending a joint tripping signal to the feeder protection device of the uplink protection unit; after a forward current element of a feeder protection device of a downlink circuit breaker is started and a locking signal sent by the feeder protection device of a downlink protection unit is not received within a time delay t, tripping off a circuit breaker corresponding to the feeder protection device and sending a joint tripping signal to the feeder protection device of the downlink protection unit; after a forward current element of a feeder line protection device of any parallel line breaker is started, a locking signal is sent to a feeder line protection device of a downstream breaker; tripping off a circuit breaker corresponding to the feeder line protection device after time delay t', and sending a joint tripping signal to the feeder line protection device of the uplink protection unit; after a reverse current element of a feeder line protection device of any parallel line breaker is started, a locking signal is sent to the feeder line protection device of the upward breaker; tripping off a circuit breaker corresponding to the feeder line protection device after time delay t', and sending a joint tripping signal to the feeder line protection device of the downlink protection unit; after any feeder line protection device receives the joint tripping signal, tripping off a circuit breaker corresponding to the feeder line protection device; after any feeder line protection device receives the locking signal, locking protection is carried out; and the starting condition of the forward current element or the reverse current element is set according to the full length of the power supply arm.
The beneficial effect of the invention is that,
(1) directional current elements are configured on the feeder line protection devices of all the kiosks, and each protection is set according to the total length of the protection power supply arm, so that the total length of the power supply arm can be independently protected.
(2) And all feeder line protection devices of the same power supply arm are connected, the deficiency of the protection range is made up through a united jump signal, and the deficiency of selectivity is made up through a locking signal, so that the integral protection of the power supply arm is formed.
(3) The fault power supply arm can be quickly isolated after the fault, the power supply of the non-fault side power supply arm is not interrupted, and the selectivity and the quick-acting property of protection are considered.
Drawings
Fig. 1 is a schematic diagram of a fully parallel AT power supply with dual circuit breakers.
FIG. 2 is a schematic diagram showing the operation characteristics of a directional current device.
Fig. 3 is a logic diagram of the action of the double-breaker mode protection 1.
Fig. 4 is a logic diagram of the action of the double-breaker mode protection 2.
Fig. 5 is a logic diagram of the action of the double-breaker mode protection 3.
Fig. 6 is a logic diagram of the action of the double breaker mode protection 4.
Fig. 7 is a logic diagram of the action of the double breaker mode protection 5.
Fig. 8 is a logic diagram of the action of the double breaker mode protection 6.
Fig. 9 is a schematic diagram of a single-circuit breaker fully-parallel AT power supply.
Fig. 10 is a logic diagram of the single breaker mode protection 1 action.
Fig. 11 is a logic diagram of single breaker mode protection 2 action.
Fig. 12 is a logic diagram of the single breaker mode protection 3 action.
Fig. 13 is a logic diagram of the single breaker mode protection 4 action.
Figure 14 schematic diagram of dual breaker mode normal power supply.
Figure 15 schematic diagram of a dual breaker mode handoff.
Fig. 16 normal power supply schematic for single breaker mode.
Fig. 17 a single breaker mode power supply schematic.
FIG. 18 is a schematic diagram of a multi-line direct-supply normal power supply.
Figure 19 is a schematic diagram of a multi-line direct supply handoff.
FIG. 20 is a schematic diagram of power supply via a multi-stage switching station. Wherein, (a) is a single-line mode, and (b) is a double-line mode.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
(1) Protection method for double circuit breaker mode
The double-breaker full-parallel AT traction network is provided with two parallel power supply lines, namely an uplink power supply arm and a downlink power supply arm, wherein the leads of the two power supply arms are connected in parallel AT a substation, an AT place and a subarea place, and two breakers are arranged on the parallel lines, as shown in figure 1. In the figure, 1QF to 6QF are circuit breakers respectively installed in a substation, an AT station and a subarea station, and the circuit breakers are controlled to trip by corresponding feeder line protection devices 1 to 6 (hereinafter referred to as feeder line protection or protection 1 to 6).
The method for protecting the relay of the power supply arm of the traction network based on the directional current element comprises the following steps:
when the traction network fails, the protection 3 and the protection 4 flow fault currents with the same magnitude and opposite directions. Similarly, the current at the protection 5 and 6 also satisfies this rule. That is, the current direction of the AT site and the partition site can distinguish whether the fault occurs upstream or downstream: if the positive direction of the current element in the specified direction points to the line from the bus, when a fault occurs in the power supply arm AT the side, the positive current element of the AT and the subarea is started, and otherwise, the reverse current element is started.
And a forward current element is configured on the feeder line protection at the power supply side, a forward current element and a reverse current element are configured on the feeder line protection at the non-power supply side, the forward direction points to a circuit from a bus, and all the protections are set according to the total length of the protection power supply arm. Taking fig. 1 as an example, forward current elements are arranged in protections 1 and 2, forward current elements and reverse current elements are arranged in protections 3 to 6, and each protection current setting value avoids the maximum load current setting:
Iset.S＝K1Imax.S (1)
in the formula Iset.SFor the setting value of the overcurrent protection of each pavilion, a lower corner mark S represents a substation, an AT station or a subarea station; k1For the reliability factor, 1.2 is usually taken; i ismax.SThe maximum load current for each pavilion when the line is in normal operation.
For the direction overcurrent protection of the AT place and the subarea place, the positive direction criterion is as follows:
in the formula (I), the compound is shown in the specification,
the angle is a sensitive angle, and the angle is generally 70 degrees for the traction net;
for each kiosk bus voltage;
the current was measured for each protection, and the operating characteristics are shown in fig. 2.
After any protected forward current element is started and does not receive a blocking signal of the same group of protection after a period of time, tripping off a corresponding circuit breaker of the protection, and simultaneously sending a joint tripping signal to the same group of protection; and after any protection receives the joint tripping signal of the same group, the circuit breaker corresponding to the protection is immediately tripped. After any protected reverse current element is started, a locking signal is immediately sent to the same group of protection; and after any protection receives the locking signal, the protection is locked immediately. Taking the protections 1-6 in fig. 1 as an example, the protections 1, 3, 5 and the protections 2, 4, 6 are connected through a high-speed communication network to form a group of protection units, and the operation logic is shown in fig. 3-8.
If the traction network is a single-wire power supply arm, for example, only the upstream power supply arm in fig. 1, the protection logic is the same as that of the single-wire power supply arm.
(2) Protection method in single breaker mode
The single-circuit-breaker full-parallel AT traction network is provided with two parallel power supply circuits, namely an uplink power supply arm and a downlink power supply arm, wherein the leads of the two power supply arms are connected in parallel AT a substation, an AT station and a subarea, and a circuit breaker is arranged on the parallel line, as shown in fig. 9. In the figure, 1QF to 4QF are circuit breakers which are respectively arranged in a substation, an AT station and a subarea station and are controlled to trip by corresponding protections 1 to 4.
If the positive direction of the current element in the specified direction points to an uplink, when the uplink traction network fails, fault current flows from the downlink to the uplink through the protection devices 3 and 4, and the positive current elements of the protection devices 3 and 4 are started; when the downlink traction network has a fault, fault current flows from the uplink to the downlink through the protection 3 and the protection 4, and reverse current elements of the protection 3 and the protection 4 are started.
And a forward current element is configured on the feeder line protection at the power supply side, a forward current element and a reverse current element are configured on the feeder line protection at the non-power supply side, the forward direction points to an uplink, and all the protections are set according to the total length of the protection power supply arm. Taking fig. 9 as an example, the forward current elements are configured in the protections 1 and 2, the forward and reverse current elements are configured in the protections 3 and 4, and the setting values and the positive direction criteria of the protections are also determined according to the formulas (1) and (2).
After a forward current element of the feeder protection at the power supply side is started and a blocking signal of the same group of protection is not received after a period of time, tripping off a corresponding circuit breaker of the protection, and simultaneously sending a joint tripping signal to the same group of protection; after a forward or reverse current element of the non-power-supply-side feeder protection is started, a locking signal is immediately sent to the power-supply-side feeder protection in the opposite direction, after a period of time, the corresponding circuit breaker of the protection is tripped, and a joint tripping signal is sent to the power-supply-side feeder protection in the same direction and the rest non-power-supply-side feeder protection. After any protection receives the joint tripping signal, the circuit breaker corresponding to the protection is immediately tripped; and after any protection receives the locking signal, the protection is locked immediately. Taking the protections 1-4 in fig. 9 as an example, the protections 1, 3, 4 and the protections 2, 3, 4 are connected through the high-speed communication network to form a group of protection units, and the operation logic is shown in fig. 10-13.
The specific embodiment is as follows:
1. dual breaker mode normal power supply
For the dual breaker mode normal power mode as shown in fig. 14, the protection embodiment is as follows:
arranging a forward current element in the protection 1 and the protection 2; and forward and reverse current elements are arranged in the protection 3-6, and the forward direction points to the line from the bus. Protections 1, 3, 5 and protections 2, 4, 6 each constitute two sets of protection units with a high-speed communication network. After any protected forward current element is started, if a blocking signal is not received after 20ms of delay, tripping off a corresponding circuit breaker, and sending a joint tripping signal to the same group of protection; after the reverse current element of any protection is started, a locking signal is sent to the other protections in the same group. After any protection receives the joint tripping signal, the corresponding circuit breaker is immediately tripped; and after any protection receives the locking signal, the protection is locked immediately.
2. Dual breaker mode power supply across zones
For the dual breaker mode handoff mode as shown in fig. 15, the substation SS2 is taken out of service and the substation SS1 is handed off via the disconnect switch 1QS of the sub-station SP. The protection embodiment is as follows:
arranging a forward current element in the protection 1, 2, 7 and 8; and forward and reverse current elements are arranged in the protection 3-6, 9 and 10, and the forward direction points to a line from a bus. Protection 1, 3, 5; protection 2, 4, 6; protection 7, 9; the protections 8, 10 are each configured as four groups of protection units using a high-speed communication network. After any protective forward current element is started, if the locking signal is not received after 20ms of delay, the corresponding circuit breaker is tripped, and a joint tripping signal is sent to the same group of protection. After the reverse current element of any protection is started, a locking signal is sent to the other protections in the same group. After any protection receives the joint tripping signal, the corresponding circuit breaker is immediately tripped; and after any protection receives the locking signal, the protection is locked immediately.
3. Normal power supply in single breaker mode
For the single breaker mode normal supply mode as shown in fig. 16, the protection implementation is as follows:
arranging a forward current element in the protection 1 and the protection 2; the protection 3, 4 is provided with a forward current element and a reverse current element, and the forward direction points to the upstream power supply arm. Protections 1, 3, 4 and protections 2, 3, 4 each constitute two sets of protection units with a high-speed communication network. After the forward current elements of the protection 1 and the protection 2 are started, if the locking signal is not received after 20ms of delay, the corresponding circuit breaker is tripped, and a joint tripping signal is sent to the same group of protection. After a forward current element of the protection 3 is started, a locking signal is immediately sent to the protection 2, after 20ms of delay, the corresponding circuit breaker is tripped, and a joint tripping signal is sent to the protection 1 and the protection 4; and after the reverse current element of the protection 3 is started, a locking signal is immediately sent to the protection 1, after 20ms of delay, the corresponding circuit breaker is tripped, and a joint tripping signal is sent to the protection 2 and the protection 4. The action logic of protection 4 is similar to protection 3. After any protection receives the joint tripping signal, the corresponding circuit breaker is immediately tripped; and after any protection receives the locking signal, the protection is locked immediately.
4. Single breaker mode power supply across zones
For the single breaker mode handoff mode as shown in fig. 17, the substation SS2 is taken out of service and the substation SS1 is handed off via the disconnect switches 1QS and 2QS of the sub-station SP. The protection embodiment is as follows:
arranging a forward current element in the protection 1 and the protection 2; and forward and reverse current elements are arranged in the protection 3-6, and the forward direction points to the uplink power supply arm. After the forward current elements of the protection 1 and the protection 2 are started, if the locking signal is not received after 20ms of delay, the corresponding circuit breaker is tripped, and a joint tripping signal is sent to the same group of protection. After a forward current element of the protection 3 is started, a locking signal is immediately sent to the protection 2, after 20ms of delay, the corresponding circuit breaker is tripped, and a joint tripping signal is sent to the protection 1 and the protections 4-6; and after the reverse current element of the protection 3 is started, a locking signal is immediately sent to the protection 1, after 20ms of delay, the corresponding circuit breaker is tripped, and a joint tripping signal is sent to the protection 2 and the protection 4-6. The action logic of protections 4-6 is similar to that of protection 3. After any protection receives the joint tripping signal, the corresponding circuit breaker is immediately tripped; and after any protection receives the locking signal, the protection is locked immediately.
5. Multiple line direct supply normal power supply
For normal power supply in the multiple-line direct power supply mode as shown in fig. 18, the protection implementation is as follows:
arranging a forward current element in the protection 1 and the protection 2; a forward current element and a reverse current element are arranged in the protection 3, and the forward direction points to the upstream power supply arm. Protections 1, 3 and protections 2, 3 constitute two sets of protection units, respectively, with a high-speed communication network. After the forward current elements of the protection 1 and the protection 2 are started, if the locking signal is not received after 20ms of delay, the corresponding circuit breaker is tripped, and a joint tripping signal is sent to the same group of protection. After a forward current element of the protection 3 is started, a locking signal is immediately sent to the protection 2, after 20ms of delay, the corresponding circuit breaker is tripped, and a joint tripping signal is sent to the protection 1; and after the reverse current element of the protection 3 is started, a locking signal is immediately sent to the protection 1, after 20ms of delay, the corresponding circuit breaker is tripped, and a joint tripping signal is sent to the protection 2. After any protection receives the joint tripping signal, the corresponding circuit breaker is immediately tripped; and after any protection receives the locking signal, the protection is locked immediately.
6. Complex line direct supply cross-region power supply
For the single breaker mode handoff mode as shown in fig. 19, the substation SS2 is taken out of service and the substation SS1 is handed off via the disconnect switches 1QS and 2QS of the sub-station SP. The protection embodiment is as follows:
arranging a forward current element in the protection 1 and the protection 2; the protection 3, 4 is provided with a forward current element and a reverse current element, and the forward direction points to the upstream power supply arm. Protections 1, 3, 4 and protections 2, 3, 4 each constitute two sets of protection units with a high-speed communication network. After the forward current elements of the protection 1 and the protection 2 are started, if the locking signal is not received after 20ms of delay, the corresponding circuit breaker is tripped, and a joint tripping signal is sent to the same group of protection. After a forward current element of the protection 3 is started, a locking signal is immediately sent to the protection 2, after 20ms of delay, the corresponding circuit breaker is tripped, and a joint tripping signal is sent to the protection 1 and the protection 4; and after the reverse current element of the protection 3 is started, a locking signal is immediately sent to the protection 1, after 20ms of delay, the corresponding circuit breaker is tripped, and a joint tripping signal is sent to the protection 2 and the protection 4. The action logic of protection 4 is similar to protection 3. After any protection receives the joint tripping signal, the corresponding circuit breaker is immediately tripped; and after any protection receives the locking signal, the protection is locked immediately.
7. Power supply via multi-stage switching station
For the power supply through the multi-stage switching station as shown in fig. 20, and the power supply of the substation SS1 through the multi-stage switching stations SSP1, SSP2, etc., the protection implementation is as follows:
arranging a forward current element in the protection 1, 2, 5 and 6; the protection 3, 4, 7, 8 is provided with a forward current element and a reverse current element, and the forward direction is directed to the line from the bus. The protections 1, 3, 2, 4, 5, 7 and 6, 8 respectively form four groups of protection units by using a high-speed communication network. After any protective forward current element is started, if the locking signal is not received after 20ms of delay, the corresponding circuit breaker is tripped, and a joint tripping signal is sent to the same group of protection. After the reverse current element of any protection is started, a locking signal is sent to the other protections in the same group. After any protection receives the joint tripping signal, the corresponding circuit breaker is immediately tripped; and after any protection receives the locking signal, the protection is locked immediately. This scheme is applicable to both single line mode and dual line mode, as shown in fig. 20(a) and 20 (b).
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| CN114094547A (en) * | 2021-10-27 | 2022-02-25 | 南京南瑞继保电气有限公司 | Protection method and protection device for compound line direct supply traction network |
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| CN113036733B (en) | 2022-11-22 |
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