CN103457350A - Automatic throw-in equipment of emergency power supply - Google Patents

Abstract

The invention discloses an automatic input device for a backup power supply. In the secondary side circuit of the voltage transformer PT of the main power supply and the backup power supply, the starting coil of the two-position relay and the power supply contact of the control end of the reset coil are connected, and the two-position mutual The normally open contact of the lock relay SWJ electrically connects the secondary side circuits of the voltage transformer PT of the main power supply and the backup power supply with the main power bus 110KV-4 and the backup power bus 110KV-5 respectively, and further realizes the 110KV voltage transformer Parallel and parallel operation modes on the PT secondary side; the beneficial effect of the present invention is that it effectively solves the design defects and deficiencies of the primary equipment, improves the reliability of the power supply system operation; avoids the protection rejection caused by improper operation The occurrence of major accidents such as movement and misoperation; satisfying the reliable power consumption of important users, and improving the professional level of relay protection.

Description

A backup power automatic input device

technical field

The invention relates to the professional technical field of substation operation of electric power system; in particular, it relates to a backup self-injection device that can automatically put the standby power into operation quickly when the common working power is disconnected due to power system failure or other reasons.

Background technique

With the increasing modernization of people's production and life in our country, people's demand and dependence on power are also multiplying, and the requirements for power quality are becoming more stringent. The goal of controlling and uninterrupted power supply is moving forward. Some power users especially have more prominent requirements for uninterrupted power supply. Therefore, the mutual switching of various power sources to ensure uninterrupted power supply and high reliability of power supply has become an important part of the protection and control loop in modern power distribution projects.

In the power supply system, the standby automatic switching device is a device that automatically switches on the backup power supply after the factory working power supply disappears. The standby self-switching device is a device that can quickly put the backup power supply or backup equipment or other normal power supply into operation after the power system failure or other reasons cause the normal working power supply to be disconnected, so that the users with the original working power supply can quickly restore power supply. An automatic control device.

When the 110KV part of the substation was originally designed, the 110KV voltage transformer PT was set on the busbar. However, due to the compact structure of the COMPASS combined electrical switch and insufficient distance, the 110KV voltage transformer PT was relocated to the 110KV incoming line side. In this way, the wiring method of the voltage transformer PT cannot meet the logical requirements of the backup and automatic switching of the 110KV inner bridge wiring, and it is impossible to realize the function of the backup and automatic switching. If the modification is not carried out, the 110KV standby automatic switching device will malfunction or refuse to operate, causing huge losses to the power grid.

Contents of the invention

The technical problem to be solved by the present invention is to provide an automatic input device for a backup power supply that can meet the logical requirements of 110KV internal bridge wiring.

The technical solution adopted in the present invention is a backup power automatic input device, including the main power supply, the secondary side circuit of the main power voltage transformer PT, the main power circuit breaker, the main power bus, the bus tie switch, the backup power, The secondary side circuit of the backup power voltage transformer PT, the backup power circuit breaker and the backup power bus, the main power is electrically connected to the main power bus through the main power circuit breaker, and the backup power is connected through the backup power circuit breaker and the backup power bus Electrically connected, the main power bus is electrically connected to the standby power bus through a bus tie switch, and also includes a two-position interlock relay SWJ, one end of the start coil and reset coil control end of the two-position interlock relay SWJ is connected to the bus The self-injection device of the coupler switch is electrically connected to the control power supply, and the other end of the start coil and reset coil control end of the double-position interlock relay SWJ is respectively connected to one end of the normally open contact DL1 and one end of the normally closed contact DL2 of the bus tie switch Electrically connected, the other end of the normally open contact DL1 of the bus tie switch and the other end of the normally closed contact DL2 are respectively electrically connected to the DC control power supply of the self-injection device of the bus tie switch, and the two-position interlock relay SWJ The two ends of the controlled normally open contact are respectively electrically connected with a group of three-phase power A630 B630 C630 after switching of the main power circuit breaker and another group of three-phase power A640 B640 C640 after switching of the backup power circuit breaker. When the tie switch is in the close position and the main power circuit breaker or backup power circuit breaker is in the off position, the DL1 of the normally open contact of the bus tie switch is closed, the two-position interlock relay SWJ operates, and the three-phase power A630 B630 C630 and the three-phase The phase power A640 B640 C640 automatically runs in parallel; when the bus tie switch is in the split position, the main power circuit breaker and the backup power circuit breaker are in the closed position, the normally closed contact DL2 of the bus tie switch is closed, and the two-position interlock relay The SWJ action returns, and the three-phase power A630 B630 C630 and the three-phase power A640 B640 C640 automatically run separately.

The model of the two-position interlock relay SWJ is DSC-11.

The beneficial effect of the present invention is that, adopting the technical scheme of the two-position interlocking relay, the wiring mode of the secondary side wiring of the voltage transformer PT is improved, which meets the logical requirements of the complex automatic switching device, and solves the design defects and problems of the primary equipment. Insufficient, improving the reliability of the power supply system operation; avoiding the occurrence of major accidents such as protection refusal and misoperation caused by improper operation; Reliable operation meets the reliable power consumption of important users and improves the professional work level of relay protection.

Description of drawings

Fig. 1 is the electrical schematic diagram of the existing backup power supply automatic input device system;

Fig. 2 is the electrical schematic diagram of the controlled part of the dual-position interlocking relay of the backup power automatic input device system of the present invention;

Fig. 3 is the electrical schematic diagram of the power supply part of the dual-position interlocking relay of the backup power automatic input device of the present invention;

In the picture:

145. Bus tie switch

111. Main power circuit breaker 112. Standby power circuit breaker

1. The DC control power supply of the bus tie automatic switching device 2. The power supply of the bus tie automatic switching device

110KV-4, main power supply busbar                                                                                                                 110KV-5, Standby power supply busbar. 

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

As shown in Figures 1 to 3, the backup power automatic input device of the present invention includes the main power supply, the secondary side circuit of the main power voltage transformer PT, the main power circuit breaker 111, the main power bus 110KV-4, and the bus tie switch 145. Backup power supply, the secondary side circuit of the backup power voltage transformer PT, the backup power circuit breaker 112 and the backup power bus 110KV-5, the main power is electrically connected to the main power bus 110KV-4 through the main power circuit breaker 111, The backup power supply is electrically connected to the backup power bus 110KV-5 through the backup power circuit breaker 112, and the main power bus 110KV-4 is electrically connected to the backup power bus 110KV-5 through the bus tie switch 145, and the two-position interlock Relay SWJ, one end of the start coil and reset coil control end of the two-position interlock relay SWJ is electrically connected to the control power supply 2 of the bus tie switch 145 self-injection device, and the two-position interlock relay SWJ start coil and reset coil control The other end of the bus tie switch 145 is electrically connected to one end of the normally open contact DL1 and one end of the normally closed contact DL2, and the other end of the normally open contact DL1 of the bus tie switch 145 is connected to the normally closed contact The other end of DL2 is electrically connected to the DC control power supply 1 of the self-injection device of the bus tie switch 145 respectively, and the two ends of the controlled normally open contact of the two-position interlock relay SWJ are respectively connected to one of the main power circuit breakers 111 after switching. A group of three-phase power A630 B630 C630 and another group of three-phase power A640 B640 C640 are electrically connected after being switched by the backup power circuit breaker 112. When in position, DL1 of the normally open contact of the bus tie switch 145 is closed, and the two-position interlock relay SWJ acts, so that the three-phase power A630 B630 C630 and the three-phase power A640 B640 C640 are automatically paralleled to meet the logic of the mutual investment mode Requirements: When the bus tie switch 145 is in the split position, and the main power circuit breaker 111 and the backup power circuit breaker 112 are in close position, the normally closed contact DL2 of the bus tie switch 145 is closed, and the two-position interlock relay SWJ operates Return to make the three-phase power A630 B630 C630 and the three-phase power A640 B640 C640 automatically run separately to meet the logic requirements of the automatic transfer mode, and the output of the automatic mutual transfer mode is the three-phase power A B C.

The model of the two-position interlock relay SWJ is DSC-11.

The voltage transformer PT of the 110KV substation is on the 110KV incoming line side, which cannot meet the wiring principles of the 110KV microcomputer backup automatic switching device. In order to save costs and improve economic benefits, the incoming line voltage transformer PT is transformed into a bus voltage transformer PT by transforming the secondary wiring of the voltage transformer PT loop to meet the backup and self-input function of the power supply.

In the secondary side circuit of the voltage transformer PT of the main power supply and the backup power supply, connect the power supply contacts of the start coil and reset coil control end of the two-position relay, and connect the main power supply through the normally open contact of the two-position interlock relay SWJ. The voltage transformer PT secondary side circuit of the backup power supply is electrically connected with the main power bus 110KV-4 and the backup power bus 110KV-5 respectively, further realizing the parallel and separate operation modes of the 110KV voltage transformer PT secondary side .

The two-position relay automatically adapts to the self-injection and mutual-injection mode of the 110KV inner bridge connection through the switching of the 110KV bus tie switch 145.

The invention adopts the technical scheme of double-position interlocking relay, which improves the wiring mode of the secondary wiring of the voltage transformer PT, satisfies the logical requirements of the complex automatic switching device, solves the design defects and deficiencies of the primary equipment, and improves the power supply. The reliability of the system operation; avoiding the occurrence of major accidents such as protection refusal and misoperation caused by improper operation; effectively improving the reliability of the automatic mutual switching device, thus ensuring the reliable operation of the power supply grid and satisfying important users The reliable power consumption has improved the professional work level of relay protection.

The present invention can also be widely used in substation transformation work of similar design and wiring mode, provides good technical support and enlightenment for other power supply units, enhances the reliability of equipment operation, and effectively improves economic benefits.

It is worth pointing out that the scope of protection of the present invention is not limited to the above-mentioned specific examples. According to the basic technical concept of the present invention, basically the same structure can also be used to achieve the purpose of the present invention, as long as those of ordinary skill in the art do not need to be creative Labor, that is, the conceivable implementation modes, all belong to the protection scope of the present invention.

Claims (2)

1. an automatic throw-in equipment of emergency power supply, comprise, main power source, the secondary side circuit of main power voltage instrument transformer PT, main power source circuit breaker (111), main power source bus (110KV-4), bus connection switch (145), stand-by power supply, the secondary side circuit of backup power source voltage instrument transformer PT, auxiliaries-supply circuit-breaker (112) and stand-by power supply bus (110KV-5), described main power source is electrically connected to main power source bus (110KV-4) by main power source circuit breaker (111), described stand-by power supply is electrically connected to by auxiliaries-supply circuit-breaker (112) and stand-by power supply bus (110KV-5), described main power source bus (110KV-4) is electrically connected to stand-by power supply bus (110KV-5) by bus connection switch (145), it is characterized in that, also comprise, two-position interlock relay SWJ, the actuating coil of described two-position interlock relay SWJ and an end of resetting coil control end are controlled power supply (2) with described bus connection switch (145) automatic bus and are electrically connected to, the other end of described two-position interlock relay SWJ actuating coil and resetting coil control end is electrically connected to the end of the normally opened contact DL1 of described bus connection switch (145) and the end of normally-closed contact DL2 respectively, the DL1 other end of the normally opened contact of described bus connection switch (145) and the other end of normally-closed contact DL2 are electrically connected to the automatic bus DC control supply (1) of bus connection switch (145) respectively, the two ends of the controlled normally opened contact of described two-position interlock relay SWJ are electrically connected to one group of three-phase electricity A630 B630 C630 after main power source circuit breaker (111) switching and another group three-phase electricity A640 B640 C640 after auxiliaries-supply circuit-breaker (112) switching respectively, when described bus connection switch (145) in co-bit, main power source circuit breaker (111) or auxiliaries-supply circuit-breaker (112) are when dividing position, the DL1 closure of the normally opened contact of described bus connection switch (145), two-position interlock relay SWJ action, three-phase electricity A630 B630 C630 and the operation of three-phase electricity A640 B640 C640 automatic Synchronization, when described bus connection switch (145) in minute the position, main power source circuit breaker (111) and auxiliaries-supply circuit-breaker (112) are in co-bit, the normally-closed contact DL2 closure of described bus connection switch (145), interlock relay SWJ action in two-position is returned, three-phase electricity A630 B630 C630 and the automatic fanout operation of three-phase electricity A640 B640 C640.

2. automatic throw-in equipment of emergency power supply according to claim 1, is characterized in that, the model of described two-position interlock relay SWJ is DSC-11.

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