CN110239398B - A kind of in-phase power supply traction substation feeder protection tripping method - Google Patents

Abstract

The invention discloses a method for protecting and tripping a feeder line of a same-phase power supply traction substation, and belongs to the technical field of traction power supply of electrified railways. And an outlet of the in-phase traction substation is provided with a charged neutral section, and when the in-phase traction substation normally operates, the left arm and the right arm are communicated with each other through the contact net. When the left arm or the right arm contacts the net and has a fault, the protection device disconnects the left arm or the right arm from the net, and only the left arm or the right arm is powered off; a neutral section joint tripping protection device is added in the neutral section, and when the left arm contact net fails, the left arm contact net protection device sends a tripping instruction to the left arm contact net circuit breaker and simultaneously sends a joint tripping command to the neutral section joint tripping protection device; when the neutral section joint tripping protection device receives a joint tripping command, if a vehicle is on the current neutral section and the running direction is from right to left, the neutral section breaker is immediately tripped to lose the power of the neutral section; if the current neutral section has no vehicle, the united jump command is remembered within a certain time, whether the vehicle exists in the neutral section or not is detected, and the vehicle is detected to be tripped immediately within the time.

Description

A kind of in-phase power supply traction substation feeder protection tripping method

technical field

The invention belongs to the technical field of AC electrified railway traction power supply.

Background technique

The single-phase system has the advantages of simple structure, low construction cost, convenient operation and maintenance, etc., which determines that single-phase power frequency AC power is generally used to supply power to railway locomotives in electrified railways. The power system hopes that all loads will draw three-phase symmetrical fundamental current from the power grid to make full use of the capacity of equipment and lines and reduce the harm of reactive current and harmonic current to the system. In order to meet this requirement, the electrified railway adopts the scheme of phase sequence rotation and sub-phase power supply. Every 20-25km along the railway is used as a power supply section, and each section is powered by different phases in the power grid in turn. A phase separation section of about 30m is set up, and the phase separation is carried out by a phase separation device. When the loads of the locomotives running on the sections where each phase is supplied separately is the same, the three-phase load of the power system can be balanced in a large range.

However, since the size of the traction load of each section cannot be the same at any time, the split-phase and subsection scheme only alleviates the influence of the three-phase unbalance to a certain extent, and does not fundamentally solve the problem of the single-phase power consumption of the railway load on the entire public power grid. influences. Electrified railways are forced to revise the design scheme and increase investment due to the problem of affecting the power quality, and the situation of passive situation often occurs.

At the same time, due to the existence of the electrical phase separation device, when the locomotive runs to the end of a power supply section, it must go through a series of complex operations such as de-stage and power failure, and then slide to the next section and then resume normal operation item by item. It increases the complexity of the locomotive operation, and at the same time seriously restricts the improvement of the running speed of the locomotive and the exertion of the traction force.

For this reason, some experts have proposed the same-phase power supply technology, which is to install a same-phase power supply device in the traction substation. However, in the case of the same-phase power supply, when the power supply arm is faulty, if the catenary of the left and right arms trips together, the power outage range is expanded compared to when the same-phase power supply technology is not used. If only the faulty arm is tripped, it is possible for the train to enter the non-electrical area (the catenary of the fault-tripped power supply arm) with the load from the energized area (the catenary of the unfaulted arm), resulting in the hidden danger of arcing, burning and even burning of the contact. network.

SUMMARY OF THE INVENTION

The purpose of the invention is to provide a feeder protection tripping method of the same-phase power supply traction substation, which can effectively solve the problem that the neutral section of the outlet of the original traction substation is electrified. The technical problem of controlling the tripping of the live neutral section at the same time.

The present invention solves the technical problem and adopts the technical scheme as follows: a feeder protection tripping method of a traction substation for same-phase power supply, wherein the traction transformer of the traction substation obtains A, B and C three-phase electric energy from the public power grid, The a-phase electricity and b-phase electricity outputted by the same-phase power supply device after compensation, the a-phase electricity is divided into three paths, the first path is connected to the left arm catenary T1 via the feeder F12, the circuit breaker DL ₁₂ and the current transformer LH ₁₂ , _The second path is connected to the right arm catenary T2 via the feeder F10 and the circuit breaker _DL10 and the current transformer LH10, and the third path is connected to the neutral section Ta via the feeder F1 and the circuit breaker DL1 and the current transformer LH1; the b The phases are electrically connected to the rail and the ground; the current transformer LH ₁₂ , the current transformer LH ₁₀ , and the current transformer LH ₁ are respectively connected to the input of the protection device BH12 of the feeder F12 , the protection device BH10 of the feeder F10 and the neutral section Ta junction trip protection device LB terminal, and detect the currents of the left arm catenary T1, the right arm catenary T2 and the neutral section Ta respectively; the output of the protection device BH12 of the feeder F12, the protection device BH10 of the feeder F10 and the jump protection device LB of the neutral section Ta The terminals are respectively connected to the control terminals of the circuit breaker DL ₁₂ , the circuit breaker DL ₁₀ , and the circuit breaker DL ₁ ; the circuit breaker DL ₁₂ , the circuit breaker DL ₁₀ , and the circuit breaker DL ₁ are used to disconnect the left arm catenary respectively in the event of a fault T1, right arm catenary T2 and neutral segment Ta; note GJ1 as the segmenter of left arm catenary T1 and neutral segment Ta, GJ2 as segmenter of right arm catenary T2 and neutral segment Ta; normal operation When the circuit breaker DL ₁₂ , the circuit breaker DL ₁₀ , and the circuit breaker DL ₁ are all closed, the left and right arm catenary T1 and T2 are connected to form the same-phase power supply;

(1) When the left arm catenary T1 fails, the protection device BH12 opens the circuit breaker _DL12 , causing the left arm catenary T1 to lose power; similarly, when the right arm catenary T2 fails, the protection device BH10 opens the circuit breaker _DL10 , resulting in a power failure of the right arm catenary T2;

(2) Add a joint tripping protection device LB in the neutral section Ta; A. When the left arm catenary T1 fails, the protection device BH12 sends a tripping command to the circuit breaker _DL12 at the same time as sending a joint tripping command to the neutral section Ta. The combined trip protection device LB; when the combined trip protection device LB receives the combined trip command, if there is a load on the current neutral section Ta, and the train travel direction is from right to left, the circuit breaker DL ₁ will be disconnected immediately to make the neutral Section Ta loses power; if the current neutral section Ta is unloaded, the combined trip command will be remembered within the specified time, and continue to detect whether the neutral section has a load. Once a load is detected, the circuit breaker DL ₁ will be disconnected immediately. After the specified time, the combined trip command will be restored; B. When the right arm catenary T2 fails, the protection device BH10 sends a trip command to the circuit breaker DL ₁₀ at the same time as sending a combined trip command to the combined trip protection device LB; the combined trip protection device LB When receiving the combined trip command, if there is a load on the current neutral section Ta and the train's running direction is from left to right, the circuit breaker DL ₁ will be tripped immediately to de-energize the neutral section Ta; if the current neutral section Ta has no power load, then remember the combined trip command within the specified time, and continue to detect whether there is a load in the neutral section Ta, within the specified time, if there is a load detected, the trip will be tripped immediately, and if the specified time is exceeded, the combined trip command will be reset;

(3) When the neutral section Ta fails, if it is a single-line electrified railway, the circuit breaker DL ₁₂ , the circuit breaker DL ₁ , and the circuit breaker DL ₁₀ are tripped at the same time, so that the left arm catenary T1 , the right arm catenary T2 and the neutral section are tripped Ta loses power at the same time; if it is a double-track electrified railway, the circuit breaker DL ₁ will be tripped. Assuming that the train travels from left to right, the circuit breaker DL ₁₂ and the circuit breaker DL ₁ will be tripped at the same time to make the left arm catenary and the neutral section Ta. Simultaneous loss of power; if the train travel direction is from right to left, the circuit breaker DL ₁₀ and the circuit breaker DL ₁ are tripped at the same time to make the right arm catenary T2 and the neutral section Ta lose power at the same time;

(4) The running direction of the train in the neutral section Ta is judged according to the current detected by the current transformer LH ₁ , the current transformer LH ₁₂ , and the current transformer LH ₁₀ : when the train travels from the left arm catenary to the neutral section Ta and does not enter the When the neutral section Ta, the current transformer LH ₁ detects that the current is very small and close to 0, the current transformer LH ₁₂ and the current transformer LH ₁₀ detect that the currents are equal in magnitude, and the current transformer LH ₁₀ flows into the neutral section Ta, the current The transformer LH ₁₂ flows out of the neutral section Ta; when the vehicle enters the neutral section Ta, the current detected by the current transformer LH ₁ is the sum of the current transformer LH ₁₂ and the current transformer LH ₁₀ , and the current transformer LH ₁₂ The current direction changes from flowing out of the neutral section Ta to flowing into the neutral section Ta, and the current direction of the current transformer LH ₁₀ remains unchanged; when the train moves from the right to the neutral section Ta and does not enter the neutral section Ta, the current transformer The current detected by LH ₁ is very small and close to 0, the current detected by the current transformer LH ₁₂ and the current transformer LH ₁₀ are equal in magnitude, the current transformer LH ₁₀ flows out of the neutral section Ta, and the current transformer LH ₁₂ flows into the neutral section Ta; When the train enters the neutral section Ta, the current detected by the current transformer LH ₁ is the sum of the currents detected by the current transformer LH ₁₂ and the current transformer LH ₁₀ , and the detected current of the current transformer LH ₁₀ The direction changes from flowing out of the neutral section Ta to flowing into the neutral section Ta, and the detected current direction of the current transformer LH ₁₂ remains unchanged.

Compared with the prior art, the beneficial effects of the present invention are:

1. Control the live neutral section to avoid new short-circuit accidents caused by the pantograph short-circuiting the catenary of the non-fault section and the catenary of the fault section when the train enters the fault section from the non-fault section, and the train enters the no-fault section with load. The hidden danger of arcing caused by the electric area will not cause arcing and burning, or even burn the catenary and cause accidents.

2. When the left arm catenary of the same-phase power supply traction substation fails, only the left arm catenary is tripped; when the right arm catenary fails, only the right arm catenary is tripped. Reduce the scope of power outages and improve the reliability of the power supply of the traction network.

3. The method of the present invention is suitable for single-line direct supply or AT electrified railway, and double-line direct supply or AT electrified railway.

Description of drawings

FIG. 1 is a schematic diagram of an embodiment of the present invention.

FIG. 2 is a schematic diagram of the connection between the protection device and the jumper of the present invention.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

Fig. 1 shows, a specific embodiment of the present invention is:

A feeder protection tripping method for a traction substation with in-phase power supply, wherein the traction transformer of the traction substation obtains A, B, C three-phase electric energy from a public power grid, and outputs a-phase electricity and b-phase electricity after compensation by a co-phase power supply device , the a-phase electricity is divided into three paths, the first path is connected to the left arm catenary T1 via the feeder F12, the circuit breaker DL ₁₂ and the current transformer LH ₁₂ , and the second path is connected to the left arm catenary T1 via the feeder F10 and the circuit breaker DL ₁₀ and the current mutual inductor The device LH ₁₀ is connected to the right arm catenary T2, and the third path is connected to the neutral section Ta through the feeder F1 and the circuit breaker DL ₁ and the current transformer LH ₁ ; the b-phase is electrically connected to the rail and the ground; the current transformer LH ₁₂ , current transformer LH ₁₀ , current transformer LH ₁ are respectively connected to the input end of the protection device BH12 of the feeder F12, the protection device BH10 of the feeder F10 and the neutral section Ta jumping protection device LB, and respectively detect the left arm catenary T1 and the right The current of the arm catenary T2 and the neutral section Ta; the output ends of the protection device BH12 of the feeder F12, the protection device BH10 of the feeder F10 and the tripping protection device LB of the neutral section Ta are respectively connected to the circuit breaker DL ₁₂ and the circuit breaker DL ₁₀ , the control terminal of the circuit breaker DL ₁ ; the circuit breaker DL ₁₂ , the circuit breaker DL ₁₀ , and the circuit breaker DL ₁ are used to disconnect the left arm catenary T1, the right arm catenary T2 and the neutral section Ta respectively under fault conditions; GJ1 is the sectionalizer of the left arm catenary T1 and the neutral section Ta, GJ2 is the sectionalizer of the right arm catenary T2 and the neutral section Ta; during normal operation, the circuit breaker DL ₁₂ , the circuit breaker DL ₁₀ , the circuit breaker DL ₁ is closed, and the left and right arm catenary T1 and T2 are connected to form the same-phase power supply; it is characterized in that:

(1) When the left arm catenary T1 fails, the protection device BH12 opens the circuit breaker _DL12 , causing the left arm catenary T1 to lose power; similarly, when the right arm catenary T2 fails, the protection device BH10 opens the circuit breaker _DL10 , resulting in a power failure of the right arm catenary T2;

(2) Add a joint tripping protection device LB in the neutral section Ta; A. When the left arm catenary T1 fails, the protection device BH12 sends a tripping command to the circuit breaker _DL12 at the same time as sending a joint tripping command to the neutral section Ta. The combined trip protection device LB; when the combined trip protection device LB receives the combined trip command, if there is a load on the current neutral section Ta, and the train travel direction is from right to left, the circuit breaker DL ₁ will be disconnected immediately to make the neutral Section Ta loses power; if the current neutral section Ta is unloaded, the combined trip command will be remembered within the specified time, and continue to detect whether the neutral section has a load. Once a load is detected, the circuit breaker DL ₁ will be disconnected immediately. After the specified time, the combined trip command will be restored; B. When the right arm catenary T2 fails, the protection device BH10 sends a trip command to the circuit breaker DL ₁₀ at the same time as sending a combined trip command to the combined trip protection device LB; the combined trip protection device LB When receiving the combined trip command, if there is a load on the current neutral section Ta and the train's running direction is from left to right, the circuit breaker DL ₁ will be tripped immediately to de-energize the neutral section Ta; if the current neutral section Ta has no power load, then remember the combined trip command within the specified time, and continue to detect whether there is a load in the neutral section Ta, within the specified time, if there is a load detected, the trip will be tripped immediately, and if the specified time is exceeded, the combined trip command will be reset;

(3) When the neutral section Ta fails, if it is a single-line electrified railway, the circuit breaker DL ₁₂ , the circuit breaker DL ₁ , and the circuit breaker DL ₁₀ are tripped at the same time, so that the left arm catenary T1 , the right arm catenary T2 and the neutral section are tripped Ta loses power at the same time; if it is a double-track electrified railway, the circuit breaker DL1 will be tripped. Assuming that the train travels from left to right, the circuit breaker DL ₁₂ and the circuit breaker DL ₁ will be tripped at the same time to make the left arm catenary and the neutral section Ta at the same time. Loss of power; if the train travels from right to left, trip the circuit breaker DL ₁₀ and the circuit breaker DL ₁ at the same time to make the right arm catenary T2 and the neutral section Ta lose power at the same time;

(4) The running direction of the train in the neutral section Ta is judged according to the current detected by the current transformer LH ₁ , the current transformer LH ₁₂ , and the current transformer LH ₁₀ : when the train travels from the left arm catenary to the neutral section Ta and does not enter the When the neutral section Ta, the current transformer LH ₁ detects that the current is very small and close to 0, the current transformer LH ₁₂ and the current transformer LH ₁₀ detect that the currents are equal in magnitude, and the current transformer LH ₁₀ flows into the neutral section Ta, the current The transformer LH12 flows out of the neutral section Ta; when the vehicle enters the neutral section Ta, the current detected by the current transformer LH ₁ is the sum of the current transformer LH ₁₂ and the current transformer LH ₁₀ , and the current of the current transformer LH ₁₂ The direction changes from flowing out of the neutral section Ta to flowing into the neutral section Ta, and the current direction of the current transformer LH ₁₀ remains unchanged; when the train moves from the right to the neutral section Ta and does not enter the neutral section Ta, the current transformer LH ₁ The detected current is very small and close to 0, the current detected by the current transformer LH ₁₂ and the current transformer LH ₁₀ are equal in magnitude, the current transformer LH ₁₀ flows out of the neutral section Ta, and the current transformer LH ₁₂ flows into the neutral section Ta ; When the train enters the neutral section Ta, the current detected by the current transformer LH ₁ is the sum of the currents detected by the current transformer LH ₁₂ and the current transformer LH ₁₀ , and the detected current direction of the current transformer LH ₁₀ The direction of the detected current of the current transformer LH ₁₂ remains unchanged from flowing out of the neutral section Ta to flowing into the neutral section Ta.

FIG. 2 shows the connection relationship between the protection device and the jumper of the present invention: the current transformer LH ₁₂ , the current transformer LH ₁₀ , and the current transformer LH ₁ respectively detect the current of the left arm catenary T1 , the right arm catenary T2 and the neutral section Ta , and connect the feeder F12 protection device BH12, the feeder F10 protection device BH10 and the input end of the neutral section Ta jumper protection device LB respectively; the feeder F12 protection device BH12, the feeder F10 protection device BH10 and the neutral section Ta jumper protection device LB The output terminals of the circuit breakers are respectively connected to the control terminals of the circuit breaker DL ₁₂ , the circuit breaker DL ₁₀ , and the circuit breaker DL ₁ .

Claims (1)

1. A feeder protection tripping method of the same-phase power supply traction substation, the traction transformer of the traction substation obtains A, B, C three-phase electric energy from the public power grid, and the output a-phase power and b-phase power after compensation by the same-phase power supply device Phase electricity, the a-phase electricity is divided into three paths, the first path is connected to the left arm catenary T1 through the feeder F12 and the circuit breaker DL ₁₂ and the current transformer LH ₁₂ , and the second path is connected to the left arm catenary T1 through the feeder F10 and the circuit breaker DL ₁₀ and The current transformer LH ₁₀ is connected to the right arm catenary T2, and the third path is connected to the neutral section Ta through the feeder F1 and the circuit breaker DL ₁ and the current transformer LH ₁ ; the b-phase is electrically connected to the rail and the ground; the current transformer LH ₁₂ , current transformer LH ₁₀ , and current transformer LH ₁ are respectively connected to the input ends of the protection device BH12 of the feeder F12 , the protection device BH10 of the feeder F10 and the protection device LB of the neutral section Ta jumper, and detect the left arm catenary T1 respectively and the current of the right arm catenary T2 and the neutral section Ta; the output ends of the protection device BH12 of the feeder F12, the protection device BH10 of the feeder F10 and the joint trip protection device LB of the neutral section Ta are respectively connected to the circuit breaker DL ₁₂ and the circuit breaker DL ₁₀ , the control terminal of the circuit breaker DL ₁ ; the circuit breaker DL ₁₂ , the circuit breaker DL ₁₀ , and the circuit breaker DL ₁ are used to disconnect the left arm catenary T1 , the right arm catenary T2 and the neutral section Ta respectively under fault conditions ; Denote GJ1 as the sectionalizer of the left arm catenary T1 and the neutral section Ta, GJ2 as the sectionalizer of the right arm catenary T2 and the neutral section Ta; during normal operation, the circuit breaker DL ₁₂ , the circuit breaker DL ₁₀ , The circuit breakers DL ₁ are all closed, and the left and right arm catenary T1 and T2 are connected to form the same-phase power supply; it is characterized in that: (1) When the left arm catenary T1 fails, the protection device BH12 opens the circuit breaker _DL12 , causing the left arm catenary T1 to lose power; similarly, when the right arm catenary T2 fails, the protection device BH10 opens the circuit breaker _DL10 , resulting in a power failure of the right arm catenary T2; (2) Add a joint tripping protection device LB in the neutral section Ta; A. When the left arm catenary T1 fails, the protection device BH12 sends a tripping command to the circuit breaker _DL12 at the same time as sending a joint tripping command to the neutral section Ta. The combined trip protection device LB; when the combined trip protection device LB receives the combined trip command, if there is a load on the current neutral section Ta, and the train travel direction is from right to left, the circuit breaker DL ₁ will be disconnected immediately to make the neutral Section Ta loses power; if the current neutral section Ta is unloaded, the combined trip command will be remembered within the specified time, and continue to detect whether the neutral section has a load. Once a load is detected, the circuit breaker DL ₁ will be disconnected immediately. After the specified time, the combined trip command will be restored; B. When the right arm catenary T2 fails, the protection device BH10 sends a trip command to the circuit breaker DL ₁₀ at the same time as sending a combined trip command to the combined trip protection device LB; the combined trip protection device LB When receiving the combined trip command, if there is a load on the current neutral section Ta and the train's running direction is from left to right, the circuit breaker DL ₁ will be tripped immediately to de-energize the neutral section Ta; if the current neutral section Ta has no power load, then remember the combined trip command within the specified time, and continue to detect whether there is a load in the neutral section Ta, within the specified time, if there is a load detected, the trip will be tripped immediately, and if the specified time is exceeded, the combined trip command will be reset; (3) When the neutral section Ta fails, if it is a single-line electrified railway, the circuit breaker DL ₁₂ , the circuit breaker DL ₁ , and the circuit breaker DL ₁₀ are tripped at the same time, so that the left arm catenary T1 , the right arm catenary T2 and the neutral section are tripped Ta loses power at the same time; if it is a double-track electrified railway, the circuit breaker DL ₁ will be tripped. Assuming that the train travels from left to right, the circuit breaker DL ₁₂ and the circuit breaker DL ₁ will be tripped at the same time to make the left arm catenary and the neutral section Ta. Simultaneous loss of power; if the train travel direction is from right to left, the circuit breaker DL ₁₀ and the circuit breaker DL ₁ are tripped at the same time to make the right arm catenary T2 and the neutral section Ta lose power at the same time; (4) The running direction of the train in the neutral section Ta is judged according to the current detected by the current transformer LH ₁ , the current transformer LH ₁₂ , and the current transformer LH ₁₀ : when the train travels from the left arm catenary to the neutral section Ta and does not enter the In the neutral section Ta, the current transformer LH1 detects that the current is very small and close to 0, the current transformer LH ₁₂ and the current transformer LH ₁₀ detect that the currents are equal in magnitude, and the current transformer LH ₁₀ flows into the neutral section Ta, and the current mutual inductance When the vehicle enters the neutral section Ta, the current detected by the current transformer LH ₁ is the sum of the current transformer LH ₁₂ and the current transformer LH ₁₀ , and the current _of the current transformer LH ₁₂ The direction changes from flowing out of the neutral section Ta to flowing into the neutral section Ta, and the current direction of the current transformer LH ₁₀ remains unchanged; when the train moves from the right to the neutral section Ta and does not enter the neutral section Ta, the current transformer LH ₁ The detected current is very small and close to 0, the current detected by the current transformer LH ₁₂ and the current transformer LH ₁₀ are equal in magnitude, the current transformer LH ₁₀ flows out of the neutral section Ta, and the current transformer LH ₁₂ flows into the neutral section Ta ; When the train enters the neutral section Ta, the current detected by the current transformer LH ₁ is the sum of the currents detected by the current transformer LH ₁₂ and the current transformer LH ₁₀ , and the detected current direction of the current transformer LH ₁₀ The direction of the detected current of the current transformer LH ₁₂ remains unchanged from flowing out of the neutral section Ta to flowing into the neutral section Ta.

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