CN205583386U - Voltage hardware of double bus scheme's of transformer substation dualization of generating line merging cells configuration is connected - Google Patents

Abstract

The utility model discloses a double-configured voltage hardware connection of a bus merging unit for double-bus connection in a substation. A bus PT merging unit with the same configuration as before is installed on each section of the bus intelligent control cabinet, and the two merging units have the same configuration. A complete set of OLP optical fiber automatic switching device is added to each busbar intelligent control cabinet, and a remote expert intelligent judgment system is also included. The remote expert intelligent judgment system is used to realize automatic capture of abnormal information and remote switching control. The remote The expert intelligent judgment system includes a bus voltage monitoring relay wiring circuit and a remote intelligent switching control logic circuit. The utility model can realize self-healing and seamless switching control of faulty equipment by increasing related equipment input and logic control loops, greatly improving the reliability of power grid equipment operation, and can arrange equipment maintenance at any time, improving the convenience of maintenance.

Description

Voltage hardware with dual configuration of bus merging unit for double bus connection in substation connect

technical field

The utility model relates to a voltage configuration scheme for a 110 kV system, in particular to a voltage hardware connection for dual configuration of a bus merging unit of a double bus connection in a substation.

Background technique

As we all know, the bus PT of the double-bus connection mode supplies power to multiple devices at multiple intervals at the same time. Once a fault occurs, the impact will be huge, the coordination of regional protection settings will be deteriorated, and it may even cause a large number of devices in the power grid to refuse to operate or trip over the level. In recent years, with the accelerated construction and continuous operation of smart substations, merging units and smart terminals have been widely used to change the traditional substation output and output mode research and development and design concepts. At present, all 110kV single-configuration protection and safety automatic devices in the 220kV intelligent station are cascaded to draw the bus voltage from the 110kV section I bus merging unit, as shown in Figures 1 and 2. DC power supply design: 110kV Section I and Section II bus merge unit DC power supply respectively leads to Section I and Section II power supply of DC power supply system, 110kV line interval protection, measurement and control, control and intelligent component power supply are distributed according to odd and even interval numbers. Generally, segment I of the DC power supply is used for odd-numbered intervals, and segment II is used for even-numbered intervals. As shown in Figure 3 and 4. The main problems in the existing bus configuration scheme are as follows: 1) 110kVI section bus merging unit equipment failure, resulting in the loss of all 110kV line interval voltages cascaded with its bus voltage, distance protection and fast section zero-sequence protection with directional elements. If it is blocked, only long-time PT disconnection overcurrent protection and zero-sequence protection (generally setting action time is 3~4 seconds) are retained. Any line or component failure in this power grid operation mode is bound to be caused by the difficulty of protection setting coordination. Leapfrog actions expand the scope of faults, and may even cause multiple lines to trip at the same time. 2) The protection, control and intelligent components of even-numbered intervals and the cascaded bus merging unit are not connected to the same segment of DC power supply. In the case of failure of DC power supply section I, all 110kV line protection voltages are lost, and the impact is the same as that of 1 )analyze.

Utility model content

The purpose of this utility model is to overcome the deficiencies of the prior art, and to provide an automatic switching control of main and backup equipment, which can effectively isolate faulty equipment, greatly improve the reliability of power grid equipment operation, and can arrange equipment maintenance at any time. The hardware connection of the 110 kV system voltage configuration scheme of the smart substation double busbar wiring method that improves the convenience of maintenance.

A kind of voltage hardware connection with double configuration of the bus merging unit of the double bus connection in the substation, including I and II buses, I and II bus intelligent control cabinets, and I and II bus PT merging units, which are installed on each section of the bus intelligent control cabinet A set of bus PT merging units with the same configuration as before, that is, bus PT merging unit A and bus PT merging unit B are installed in each bus intelligent control cabinet. It can output bus voltage I and bus II externally. In order to realize the seamless switching of main and backup devices of bus voltage, a complete set of OLP optical fiber automatic switching device is added to each bus intelligent control cabinet. When the two sets of combined units are normal Next, the A set of merging units works as the main equipment, and the B set of merging units works as hot standby equipment, and also includes a remote expert intelligent judgment system, which is used to realize automatic capture of abnormal information and remote switching control. The remote expert intelligent judgment system includes a bus voltage monitoring relay wiring circuit and a remote intelligent switching control logic circuit.

Based on the existing busbar voltage design, the utility model installs a set of busbar PT merging unit with the same configuration as before on each section of busbar intelligent control cabinet, that is, I busbar intelligent control cabinet is equipped with I busbar PT merging unit. Unit A and I busbar PT merging unit B have the same configuration, both have the bus voltage parallel function, and both can output I bus and II bus voltage to the outside. In order to realize the seamless switching of the main and backup devices of the bus voltage, a complete set of OLP optical fiber automatic switching devices needs to be added to each bus intelligent control cabinet. When the two sets of equipment are normal, the A set works as the main equipment, and the B set The set is used as hot standby equipment. When the failure of the merging device of set A causes cascading or leads to the relevant interval of the bus equipment, the SV cascading abnormality or PT disconnection signal occurs, or it is accompanied by abnormalities such as DC disappearance of the bus merging unit of set A or device lockout. Information, and real-time monitoring and comprehensive judgment of the busbar intelligent control cabinet protection measurement, metering AC voltage input, B-set merging unit, and hard contact signal of the OLP device, remote expert intelligent judgment (comprehensive logic based on the above-mentioned working status and abnormal information Discrimination), to realize automatic capture of abnormal information and remote switching control.

The 110 kV system voltage configuration scheme of the intelligent substation dual-bus connection mode can also be switched by manual remote or local manual control to drive the OLP device.

The wiring circuit of the bus voltage monitoring relay is specifically: installing AB and BC phase low-voltage monitoring relays on each bus protection and metering secondary winding of each bus intelligent control cabinet, and the output voltage of the bus voltage transformer is normal and When the wiring is normal, the relay input coil has a secondary voltage of 100V, so the low-voltage relay does not operate; when the output voltage of the bus voltage transformer and the wiring are abnormal, the AB and BC phase low-voltage monitoring relays detect that the input voltage is lower than 70V, At this time, the relay operates, and the two low-voltage monitoring relay alarm signal contacts of the bus section I are connected in parallel to the bus intelligent terminal equipment in the bus intelligent control cabinet of the bus section, and the two low-voltage monitoring relay alarm signal contacts of the bus section II are also connected in parallel The cabinet's bus intelligent terminal equipment. The added busbar PT merging unit device B has the busbar protection, metering and opening voltage input of sections I and II connected in parallel with the input of the busbar PT merging unit device A, and is connected in parallel to the back end of the low-voltage monitoring relay. The working power of the merging unit device B is provided by Independent DC circuit breaker supply, the power is taken from the DC power input of the bus intelligent control cabinet of this section; the device lockout and DC power failure signal are connected to the bus intelligent terminal equipment of the bus intelligent control cabinet of this section, and the combined unit device A and the combined unit device B are both Configure the pigtail jumper to the input end of the OLP device, and at the same time connect the cascade branch optical cable to the output end of the OLP device. The power supply of the added OLP device is supplied by an independent DC circuit breaker, and the power is taken from the DC power supply of the intelligent control cabinet of the busbar. Input; the fault signal of the OLP device is also connected to the bus intelligent terminal equipment of the bus intelligent control cabinet of this section, and the two-position standby opening point of the bus intelligent terminal equipment of the bus intelligent control cabinet of this section is used, and the outlets available for switching on and off are connected in series at the same time Control the pressure plate to realize remote control automatic or manual switching control. The output point is connected with the newly added local manual switching control button on the cabinet and then connected to the switching circuit of the OLP device to form a remote and local optical fiber switching control circuit to control the power supply. The working power supply of the intelligent terminal equipment of the bus that adopts the intelligent control cabinet of the bus.

In summary, the utility model has the following advantages compared with the prior art:

The utility model can realize self-healing and seamless switching control of faulty equipment by increasing investment in related equipment and logic control loops and combining corresponding controls, greatly improving the reliability of power grid equipment operation, and can arrange equipment maintenance at any time to improve maintenance. convenience.

Description of drawings

Fig. 1 is a schematic diagram of wiring of a 110kV section I bus merging unit in the prior art.

Fig. 2 is a schematic diagram of the wiring of the merging unit of the 110kV II section bus in the prior art.

Fig. 3 is a schematic diagram of section I wiring of the 110kV system interval DC power supply.

Figure 4 is a schematic diagram of section II wiring of the 110kV system interval DC power supply.

Fig. 5 is a wiring circuit diagram of the 110kVI section bus of the utility model with a voltage monitoring relay installed.

Fig. 6 is a schematic circuit diagram of switching control of 110kVI section bus merging unit of the utility model.

Fig. 7 is the wiring circuit diagram of the 110kVII section bus of the utility model equipped with a voltage monitoring relay.

Fig. 8 is a schematic circuit diagram of switching control of 110kVII section bus merging unit of the present invention.

detailed description

Below in conjunction with embodiment the utility model is described in more detail.

Example 1

A dual-configuration voltage hardware connection of a bus merging unit for double-bus wiring in a substation, specifically installing a set of bus PT merging units with the same configuration as before on each bus intelligent control cabinet. That is to say, the intelligent control cabinet of the busbar I is equipped with the PT merging unit A of the busbar I and the PT merging unit B of the busbar I. The configuration of the two merging units is the same, and both have the parallel function of the busbar voltage, and both can output busbar I and II bus voltages externally. . That is to say, the intelligent control cabinet of bus II is equipped with PT combining unit A of bus II and PT combining unit B of bus II. . In order to realize the seamless switching of the main and standby devices of the bus voltage, a complete set of OLP optical fiber automatic switching device needs to be added to each bus intelligent control cabinet. When the two sets of equipment are normal, the A set works as the main equipment, and the B set As a hot standby device, when the failure of the merging device of A set causes cascading or leads to the relevant interval of the bus equipment, SV cascading abnormality or PT disconnection signal appears, or accompanied by abnormal information such as DC disappearance of the bus merging unit of A set or device blocking , and the real-time monitoring and comprehensive judgment of the busbar intelligent control cabinet protection measurement, metering AC voltage input, B-set merging unit and OLP device hard contact signal, remote expert intelligent judgment (comprehensive logic judgment based on the above working status and abnormal information ), to realize automatic capture of abnormal information and remote switching control, or in the case of failure of remote intelligent judgment, the operation and maintenance personnel on duty can drive the OLP device to switch through manual remote or local manual control, the wiring circuit diagram of the bus voltage monitoring relay, switching Schematic diagram of the control circuit, remote intelligent switching control logic diagram.

The utility model is specifically as follows: the following main equipment needs to be added to the original design scheme: 1) Each section of the bus intelligent control cabinet is equipped with a bus merging device, and the double bus connection is 2 sets; 2) Each section of the bus intelligent control cabinet is equipped with 1 One set of OLP optical fiber automatic switching device, 2 sets for double-bus wiring; 3) Each bus section needs to be equipped with 4 AC input voltage monitoring relays for bus intelligent control cabinet, 8 for double-bus wiring.

2. Loop wiring situation (in this article, the PT intelligent control cabinet of section I busbar is taken as an example, and the section II busbar is the same): 1) Install AB and BC phase low-voltage monitoring relays in each section of busbar protection and metering secondary windings (generally set at 70V), when the output voltage of the bus voltage transformer is normal and the wiring is normal, the relay input coil has a secondary voltage of 100V, so the low voltage relay does not operate; when the output voltage of the bus voltage transformer and the wiring are abnormal, the AB and BC phases are low The voltage monitoring relay detects that the input voltage is lower than 70V. At this time, the relay operates, and the two low-voltage monitoring relay alarm signal contacts of the I-section bus are connected together and then connected to the I-section bus intelligent terminal equipment, and the II-section bus two low-voltage monitoring relays alarm The signal contacts are also connected in parallel to the intelligent terminal equipment of the I-section busbar. 2) The added busbar PT merging unit device B, its I and II section busbar protection, metering, opening voltage input and busbar PT merging unit device A input are connected in parallel, and are connected in parallel to the back end of the low voltage monitoring relay; PT merging unit device B The working power is supplied by an independent DC circuit breaker, and the power is taken from the DC power input of the cabinet; the device is locked and the DC power-off signal is connected to the I-section bus intelligent terminal. 3) The merging unit device A and the merging unit device B are equipped with pigtail jumpers to the input end of the OLP device, and at the same time connect the optical cables of the cascading branches to the output end of the OLP device. 4) The power supply of the added OLP device is supplied by an independent DC circuit breaker, and the power is taken from the DC power input of the cabinet; the device fault signal is connected to the intelligent terminal equipment of the I-section bus. 5) Utilize the dual-position backup output point of the intelligent terminal equipment in the I-female PT intelligent control cabinet, and at the same time connect in series the output control platen that can be switched on and off to realize remote control automatic or manual switching control. This output point is newly added on the same cabinet The on-site manual switching control button is connected to the switching circuit of the OLP device to form a remote and on-site optical fiber switching control circuit, and the control power supply uses the working power supply of the intelligent terminal equipment of the cabinet.

The parts not described in this embodiment are the same as the prior art.

Claims (3)

1. A voltage hardware connection with double configuration of bus merging unit for double bus connection in substation, including I and II bus, I and II bus intelligent control cabinet, I and II bus PT merging unit, characterized in that: in each section A bus PT merging unit with the same configuration as before is installed on the bus intelligent control cabinet, that is, a bus PT merging unit A and a bus PT merging unit B are installed in each bus intelligent control cabinet. The two merging units have the same configuration and have The parallel function of the bus voltage can output bus voltage I and bus II externally. In order to realize the seamless switching of the main and backup devices of the bus voltage, a complete set of OLP optical fiber automatic switching device is added to each bus intelligent control cabinet. When the two Under normal circumstances, the merging unit of the set A works as the main equipment, and the merging unit of the B set works as the hot standby equipment. It also includes a remote expert intelligent judgment system. The remote expert intelligent judgment system is used to automatically capture abnormal information and remotely For switching control, the remote expert intelligent judgment system includes a bus voltage monitoring relay wiring circuit and a remote intelligent switching control logic circuit. 2. The voltage hardware connection of the double configuration of the bus merging unit of the substation double bus connection according to claim 1, characterized in that: the voltage connection of the double configuration of the double bus connection bus merging unit of the substation can also be manually remote Or manually control and drive the OLP device to switch on the spot. 3. According to claim 1 or 2, the voltage hardware connection of the dual configuration of the bus merging unit of the double bus connection of the substation is characterized in that: the wiring circuit of the bus voltage monitoring relay is specifically in each section of the bus intelligent control cabinet Each busbar protection and metering secondary winding is equipped with AB and BC phase low voltage monitoring relays. When the output voltage of the busbar voltage transformer is normal and the wiring is normal, the relay input coil has a secondary voltage of 100V, so the low voltage relay does not operate; When the output voltage of the bus voltage transformer is abnormal and the wiring is abnormal, the AB and BC phase low-voltage monitoring relays detect that the input voltage is lower than 70V. At this time, the relay operates, and the two low-voltage monitoring relay alarm signal contacts of the I-section bus are connected together and then connected. The bus intelligent terminal equipment of the bus intelligent control cabinet in this section, the two low-voltage monitoring relay alarm signal contacts of the bus section II are also connected to the bus intelligent terminal equipment of this cabinet, and the added bus PT merging unit device B has its I and II bus sections Protection, metering, opening voltage input are connected in parallel with the input of busbar PT merging unit device A, and are connected in parallel to the back end of the low voltage monitoring relay. The working power of merging unit device B is supplied by an independent DC circuit breaker, and the power is taken from the intelligent control of the busbar The DC power input of the cabinet; the device lockout and DC power-off signal are connected to the bus intelligent terminal equipment of the bus intelligent control cabinet in this section. The merging unit device A and the merging unit device B are equipped with pigtail jumpers to the input end of the OLP device. The cascade branch optical cable connection is connected to the output end of the OLP device, and the power supply of the added OLP device is supplied by an independent DC circuit breaker, and the power is taken from the DC power input of the intelligent control cabinet of the bus; the fault signal of the OLP device is also connected to the intelligent control of the bus The bus intelligent terminal equipment of the cabinet uses the dual-position standby opening point of the bus intelligent terminal equipment of the bus intelligent control cabinet in this section, and at the same time connects in series the exit control pressure plate that can be switched on and off to realize remote control automatic or manual switching control, the output point The newly added local manual switching control button on the same cabinet is connected to the switching circuit of the OLP device to form a remote and local optical fiber switching control circuit. The control power supply uses the working power supply of the bus intelligent terminal equipment of the bus intelligent control cabinet.