CN113036734B - Traction network power supply arm relay protection method based on directional current increment element - Google Patents
Traction network power supply arm relay protection method based on directional current increment element Download PDFInfo
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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
- H02H7/28—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 for meshed systems
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Abstract
The invention discloses a traction network power supply arm relay protection method based on a directional current increment element. The pavilion of the traction network is connected to a power supply arm through a circuit breaker, and the circuit breaker is provided with a feeder line protection device; the feeder line protection device comprises a directional current increment element and also forms a protection unit; after the directional current increment element is started, tripping off a circuit breaker corresponding to the feeder line protection device and sending a joint tripping signal or a locking signal to the feeder line protection devices of the same group of protection units; the feeder line protection device trips off a corresponding circuit breaker after receiving the joint tripping signal, and locks and protects after receiving a locking signal; and setting the starting condition of the directional current increment element according to the full length of the power supply arm. The invention has the advantages that the full length of the power supply arm can be independently protected; the deficiency of the protection range is made up through the jump signal, and the deficiency of the selectivity is made up through the locking signal, so that the integral protection of the power supply arm is formed; the fault power supply arm can be quickly isolated after the fault, and the power supply of the non-fault side power supply arm is not interrupted.
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 increment 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 the full parallel AT power supply mode, connects the homonymy wire of the up-and-down line in parallel respectively AT the electric substation, AT institute and subregion, and this kind of power supply mode has advantages such as reducing and pulls net unit impedance, improves and pulls net voltage, improvement power supply ability, reduction electromagnetic interference. 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 103715670A, "a high speed railway power supply arm joint tripping protection method based on impedance characteristics", impedance protection with quadrilateral action characteristics is configured in a substation, an AT site and a subarea, and the integral protection of the power supply arm is formed by joint tripping signals. In patent CN 103715671A, "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 a joint tripping signal. According to the two schemes, the power supply section between the substation and the AT station is jointly protected through the protection of the substation and the AT station, the power supply section between the AT station and the subarea station is jointly protected through the protection of the AT station and the subarea station, all protection devices cannot independently protect the whole power supply arm, and protection refusal is caused once communication faults occur.
Disclosure of Invention
The invention discloses a traction network power supply arm relay protection method based on a directional current increment 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 increment 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 of the supply side comprises a forward current increment element, and the feeder protection device of the circuit breaker configuration of the non-supply side comprises a forward current increment element and a reverse current increment 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 increment 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 tripping signal to the feeder line protection devices of the same group of protection units; after a reverse current increment 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 increment element or the reverse current increment 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 a directional current increment element 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, a parallel line breaker is arranged on a parallel line of a non-power supply station, 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 increment elements pointing to the power supply arm, and the feeder line protection device of the parallel circuit breaker comprises forward current increment elements pointing to the uplink power supply arm and reverse current increment 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 increment 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 increment 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 increment element of a feeder protection device of any parallel circuit breaker is started, a locking signal is sent to the feeder protection device of a downstream circuit 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 increment 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 increment element or the reverse current increment element is set according to the full length of the power supply arm.
The beneficial effect of the invention is that,
(1) The feeder line protection devices of all the pavilions are provided with directional current increment elements, each protection is set according to the total length of the protection power supply arm, and 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 of the operation characteristics of the directional current increment element.
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-current 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 installed in a substation, an AT station and a substation, respectively, and are controlled to trip by corresponding feeder protection devices 1 to 6 (hereinafter referred to as feeder 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 increment element comprises the following steps:
when the traction network has a fault, fault currents with the same magnitude and opposite directions flow through the protection devices 3 and 4, and the current is the variation of the current before and after the fault, namely the current increment. Similarly, the current increments at protections 5 and 6 also satisfy this rule. That is, the current increment direction of the AT site and the partition site can distinguish whether the fault occurs in the uplink or the downlink: if the positive direction of the current increment element in the specified direction points to the line from the bus, when a fault occurs on the power supply arm AT the side, the positive current increment element of the AT and the subarea is started, and otherwise, the reverse current increment element is started.
A forward current increment element is configured on the feeder protection at the power supply side, a forward current increment element and a reverse current increment element are configured on the feeder 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 full length of a protection power supply arm. Taking fig. 1 as an example, the protection 1 and the protection 2 are provided with forward current increment elements, the protection 3 to the protection 6 are provided with forward current increment elements, and each protection current increment setting value is set according to the maximum current change within one cycle:
ΔI set.S ＝K 1 ΔI max.S (1)
in the formula,. DELTA.I set.S For the setting value of the current increment protection of each pavilion, a lower corner mark S represents a substation, an AT station or a subarea station; k 1 For the reliability factor, 1.2 is usually taken; delta I max.S The maximum current change in one cycle of each pavilion during normal operation of the line is realized.
For the directional current increment 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 the bus voltage variation of each pavilion in a cycle,
the bus voltage is the voltage of the bus at the current moment,
a cycle front bus voltage;
measuring the current variation for each protection within a cycle,
for the current value to be measured at the present moment,
the current values were measured for a cycle front. The directional motion characteristic is shown in fig. 2.
After any protected forward current increment 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 increment 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 to 6 in fig. 1 as an example, the protections 1, 3, and 5 and the protections 2, 4, and 6 are connected via a high-speed communication network to form a group of protection units, and the operation logics thereof are shown in fig. 3 to 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-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 station and a subarea, and a breaker is arranged on the parallel line, as shown in fig. 9. In the figure, 1QF to 4QF are circuit breakers arranged in a substation, an AT station and a subarea station respectively, and the circuit breakers are controlled to trip by corresponding protections 1 to 4.
If the current increment 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 3 and the protection 4, and the forward current increment elements of the protection 3 and the protection 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 the reverse current increment original elements of the protection 3 and the protection 4 are started.
And a forward current increment element is configured on the feeder line protection at the power supply side, a forward current increment element and a reverse current increment 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 full length of the protection power supply arm. Taking fig. 9 as an example, the forward current increment elements are configured in the protections 1 and 2, the forward and reverse current increment elements are configured in the protections 3 and 4, and the setting value and the forward direction criterion of each protection are also determined according to the formulas (1) and (2).
After a forward current increment element of the feeder protection at the power supply side is started and a locking signal of the same group of protection is not received after a period of time, tripping 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 increment 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 to 4 in fig. 9 as an example, the protections 1, 3, and 4 and the protections 2, 3, and 4 are connected via a high-speed communication network to form a group of protection units, and the operation logics thereof are shown in fig. 10 to 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:
configuring a forward current increment element in the protection 1 and the protection 2; and forward and reverse current increment elements are arranged in the protections 3-6, and the forward direction is directed to the line from the bus. Protections 1, 3, 5 and protections 2, 4, 6 each form two sets of protection units using a high-speed communications network. After any protected forward current increment element is started, if a locking 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; and after the reverse current increment 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 handoff disconnect switch 1QS of the substation SP. The protection embodiment is as follows:
configuring a forward current increment element at the protections 1, 2, 7 and 8; and forward and reverse current increment elements are arranged in the protections 3-6, 9 and 10, and the forward direction is directed to the line from the 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 protected forward current increment element is started, if the locking signal is not received after 20ms of delay, the corresponding circuit breaker is tripped off, and a joint tripping signal is sent to the same group of protection. After the reverse current increment 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; after any protection receives the blocking signal, the protection is blocked immediately.
3. Normal power supply in single breaker mode
For the single breaker mode normal power mode as shown in fig. 16, the protection implementation is as follows:
configuring a forward current increment element in the protection 1 and the protection 2; forward and reverse current increment elements are provided in the protection 3, 4, the forward direction pointing towards the upstream 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 increment elements of the protection 1 and the protection 2 are started, if the locking signal is not received after delaying for 20ms, the corresponding circuit breaker is tripped off, and a joint tripping signal is sent to the same group of protection. After a forward current increment 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 increment 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 off; 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 handoff isolators 1QS and 2QS of the substation SP. The protection embodiment is as follows:
configuring a forward current increment element in the protection 1 and the protection 2; and forward and reverse current increment elements are arranged in the protections 3-6, and the forward direction points to the uplink power supply arm. After the forward current increment elements of the protection 1 and the protection 2 are started, if the locking signal is not received after delaying for 20ms, the corresponding circuit breaker is tripped off, and a joint tripping signal is sent to the same group of protection. After a forward current increment 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 increment 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 protections 4-6. The action logic of protections 4-6 is similar to protection 3. After any protection receives the joint tripping signal, the corresponding circuit breaker is immediately tripped; after any protection receives the blocking signal, the protection is blocked 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:
configuring a forward current increment element in the protection 1 and the protection 2; a forward and reverse current increment element is provided in the protection 3, the forward direction pointing towards the upstream supply arm. Protections 1 and 3 and protections 2 and 3 respectively form two groups of protection units by using a high-speed communication network. After the forward current increment 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 increment 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 increment 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. Multiple line direct supply cross-area 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 handoff isolators 1QS and 2QS of the substation SP. The protection embodiment is as follows:
configuring a forward current increment element in the protection 1 and the protection 2; forward and reverse current delta elements are provided in the protection 3, 4, the forward direction pointing towards the upstream 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 increment 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 increment 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 increment 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 via the multi-stage switching station shown in fig. 20, and the power supply of the substation SS1 via the multi-stage switching stations SSP1, SSP2, etc., the protection implementation is as follows:
configuring a forward current increment element in the protection 1, 2, 5 and 6; the protection 3, 4, 7, 8 is provided with a forward and a reverse current increment 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 protected forward current increment 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 increment 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 off; 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).
Claims (3)
1. A traction network power supply arm relay protection method based on a directional current increment element is characterized in that,
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 is configured with a forward current increment element, and the feeder protection device of the circuit breaker configuration on the non-power supply side is configured with a forward current increment element and a reverse current increment 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 increment 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 tripping signal to the feeder line protection devices of the same group of protection units;
after a reverse current increment 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 increment element or the reverse current increment element is set according to the full length of the protection power supply arm.
2. The method for traction network power supply arm relay protection based on the directional current increment element as claimed in claim 1, wherein the power supply arm comprises an upstream power supply arm and a downstream power supply arm.
3. A power supply arm relay protection method of a traction network based on a directional current increment element is characterized in that the traction network comprises more than two kiosks, the power supply kiosks are connected to an uplink power supply arm and a downlink power supply arm through an uplink breaker and a downlink breaker respectively, a parallel line breaker is arranged on a parallel line of a non-power supply kiosk, 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 are provided with forward current increment elements pointing to the power supply arm, and the feeder line protection devices of the parallel circuit breaker are provided with forward current increment elements pointing to the uplink power supply arm and reverse current increment 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 increment 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 increment 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 increment element of a feeder line protection device of any parallel circuit breaker is started, a locking signal is sent to the feeder line protection device of a downstream circuit breaker; after the 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 device of the uplink protection unit;
after a reverse current increment 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 increment element or the reverse current increment element is set according to the full length of the protection power supply arm.
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| CN103715670B (en) * | 2013-12-30 | 2016-05-18 | 西南交通大学 | A kind of high-speed railway supply arm connection based on impedance characteristic is jumped guard method |
| CN103941149B (en) * | 2014-03-25 | 2016-06-08 | 四川旷谷信息工程有限公司 | Electrified railway traction networks localization of fault method |
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| CN102166969A (en) * | 2011-03-17 | 2011-08-31 | 许继集团有限公司 | Electrified railway in-phase power supply device and multi-target coordinated instantaneous current control method |
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