CN103532111A - Incoming line and outgoing line protector of switching station - Google Patents

Abstract

The invention discloses a protection device for incoming and outgoing lines of a switch station, which includes an incoming line and several outgoing line branches, the incoming line is connected with a circuit breaker switch, and each outgoing line branch is equipped with a load switch , each of the load switches is connected to an outgoing line protection measurement and control device, the circuit breaker switch is connected to an incoming line protection measurement and control device, and the outgoing line protection measurement and control device is connected to a parallel connection of several open-in switches. On the input switch row, the output of the input switch row is to the incoming line protection measurement and control device. The invention does not need to replace the load switch, and through the linkage control mode, when the outlet branch short-circuits, the faulty outlet branch is isolated, and the power supply of the non-faulty outlet branch is quickly restored, thereby avoiding a large-scale power failure.

Description

A switch station incoming line and outgoing line protection device

technical field

The invention relates to a protection device for a power system, in particular to a protection device for incoming and outgoing lines of a switch station.

Background technique

The switch station generally includes incoming lines and several outgoing line branches. The 10KV high voltage is input through the incoming lines and then output to power users by each outgoing line branch. The traditional switchyard protection is to connect the circuit breaker switch on the incoming line, and connect a load switch on each outgoing line branch. According to the characteristics of the circuit breaker switch and the load switch, the circuit breaker switch can cut off and connect the load current and the short circuit current circuit, but the load switch can only cut off and connect the load current circuit. Due to the progress of economic production, the demand for electricity is gradually rising, and the number of power users is also rising, so the branch lines are also increasing. Under the traditional switch station protection method, if there is a short-circuit current in an outgoing line branch, the incoming line power supply needs to be disconnected through the circuit breaker switch. When the number of power users continues to rise, large-scale power outages are caused, which seriously affects economic production. Not only that, but under normal circumstances, the load switch connected to the outgoing line is protected by a fuse. As a one-time protection element, the fuse cannot be used after completing a protection action and needs to be replaced, which increases the cost of fuse procurement and labor installation. Therefore, there is a proposal to replace the load switches on the outlet branches with circuit breaker switches, which can directly disconnect the outlet branches with short-circuit faults. However, the cost of the circuit breaker switch is much higher than that of the load switch. Replacing all load switches with circuit breaker switches will greatly increase the cost of equipment.

Contents of the invention

The problem to be solved by the present invention is to provide a protection device for incoming and outgoing lines of a switch station, which can partially cut off the power of the outgoing line branches with short-circuit faults, and restore the power supply to the non-faulty outgoing line branches. It avoids a large-scale power outage, reduces the economic loss caused by the power outage, and does not need to replace the original load switch, and will not increase the equipment cost. Replace the original fuse protection with digital relay protection, saving the cost of purchasing and installing fuses manually.

In order to solve the above technical problems, the present invention adopts the following technical solution: a protection device for incoming and outgoing lines of a switch station, including one incoming line and several outgoing line branches, the incoming line is connected with a circuit breaker switch, and each of the A load switch is arranged on each outgoing line branch, and each load switch is connected with an outgoing line protection measurement and control device, and the circuit breaker switch is connected with an incoming line protection measurement and control device, and the outgoing line protection measurement and control device is connected to a Several switch-in switches are connected in parallel on a switch-in switch bank, and the switch-in switch bank is output to the line-in protection measurement and control device.

Preferably, both the incoming line protection measurement and control device and the outgoing line protection measurement and control device are digital relay protection devices.

Preferably, each outgoing line protection measurement and control device is equipped with an outgoing line side current transformer and an outgoing line side control unit, and the incoming line protection measurement and control device is provided with an incoming line side current transformer and an incoming line side control unit;

Current transformer on the outlet side: connect to the outlet branch where it is located, detect the current data on the outlet branch and send it to the control unit on the outlet side;

Outlet side control unit: connected to the load switch to control the action of the load switch, and connected to the input switch bank to control the action of the circuit breaker switch;

Current transformer on the incoming line side: connected to the incoming line, detects the current data of the incoming line and transmits it to the control unit on the incoming line side;

Line side control unit: controls the action of the circuit breaker switch.

Preferably, each outlet protection measurement and control device is equipped with an outlet side terminal block, including an outlet linkage trip terminal, an outlet linkage closing terminal and an outlet linkage opening terminal. There are two outlet linkage trip terminals, respectively One terminal and the second terminal, the outgoing line side control unit is connected to the input switch bank through the first terminal, and the input line side control unit is connected to the incoming line side control unit through the open input switch bar, and the outgoing line side control unit is connected to the incoming line protection measurement and control through the second terminal The prompt circuit of the device, there are also two outgoing line linkage closing terminals, which are respectively the third terminal and the fourth terminal. The control unit on the incoming line side and the outgoing line side control unit are also connected to the prompt circuit of the incoming line protection measurement and control device through the fourth terminal. The control unit on the outgoing line side sends a prompt signal of linkage tripping and linkage closing to the prompt circuit of the incoming line protection measurement and control device through the second terminal and the fourth terminal respectively, and the outgoing line linkage opening terminal is connected to the detection of the incoming line protection measurement and control device. The circuit is used to judge the action state of the circuit breaker switch. The terminal block on the outlet side is also provided with a load trip terminal and a load detection terminal. The control unit on the outlet side sends an opening command to the load switch through the load trip terminal to control the action of the load switch. , and the outlet side control unit judges the action state of the load switch through the load detection terminal.

Preferably, an incoming line side terminal block is provided in the incoming line protection measurement and control device, including a bus trip terminal, an incoming line linkage trip terminal, an incoming line linkage closing terminal, and an incoming line linkage opening terminal. The incoming line protection measurement and control device The prompt circuit includes an incoming line linkage tripping terminal and an incoming line linkage closing terminal, the second terminal and the fourth terminal are respectively connected to the incoming line linkage tripping terminal and the incoming line linkage closing terminal, and the detection and control device for the incoming line protection The circuit includes an incoming line linkage opening terminal, the outgoing line linkage opening terminal is connected to the incoming line linkage opening terminal, and the incoming line side control unit is connected to the circuit breaker switch through the bus trip terminal to control the action of the circuit breaker switch .

After adopting the technical scheme, the present invention has the following advantages:

Through the linkage control mode of the incoming line protection measurement and control device, the outgoing line protection measurement and control device, the circuit breaker switch and the load switch, when a short circuit occurs in the outgoing line branch, the faulty outgoing line branch can be partially isolated and the power supply of the non-faulty outgoing line branch can be restored. . Wide-scale power outages are avoided, and economic losses caused by power outages are reduced. The traditional load switch is still used on the outlet branch, which will not increase the equipment cost.

Description of drawings

The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

Fig. 1 is the switch station incoming line and outgoing line protection wiring principle diagram of the present invention;

Figure 2 is the linkage control wiring diagram of the incoming line and one outgoing line branch.

Detailed ways

For the protection of the incoming and outgoing lines of the switchyard, it is usually connected with a circuit breaker switch on the incoming line and a load switch on the outgoing line. Since the load switch can only disconnect the faulty line caused by the load current but cannot disconnect the faulty line caused by the short-circuit current, if the traditional method is used, when a short-circuit fault occurs in the outgoing line branch, the tripping of the circuit breaker switch will cause the entire power supply area of the switch station to fail. outage.

A switch station incoming line and outgoing line protection device of the present invention, as shown in Figure 1-2, includes an incoming line 1 and several outgoing line branches 2, the incoming line 1 is connected with a circuit breaker switch, the Each outgoing line branch 2 is provided with a load switch, each of the load switches is connected to an outgoing line protection measurement and control device 4, and the circuit breaker switch is connected to an incoming line protection measurement and control device 3, and the outgoing line protection measurement and control device 3 4 are all connected to a switch bank composed of several switch switches connected in parallel, and the switch bank is output to the incoming line protection measurement and control device 3 . When a short-circuit fault occurs in a branch of the outgoing line, the outgoing line protection measurement and control device 4 on the outgoing line branch detects a short-circuit signal, and through the incoming line protection measurement and control device 3, the outgoing line protection measurement and control device 4, the circuit breaker switch, the load switch and the input switch row The linkage control mode with mutual logical cooperation isolates the outlet branch 2 where the short-circuit fault occurs. The definition of the linkage control method refers to linking the control circuits of the controlled objects with each other according to the requirements of the simple logical relationship between the controlled objects by using interlocking and blocking conditions to form a specific logical relationship, thereby realizing automatic operation . When the outgoing line protection measurement and control device 4 detects and judges that a short-circuit fault occurs in the branch of the outgoing line, it sends a switch-in signal to the open-in switch bank to send a linkage trip command to the incoming line protection measurement and control device 3, and through the incoming line protection measurement and control device 3 The circuit breaker switch is controlled to trip, and the power supply area of the whole switchyard is cut off. Since the incoming line has no voltage and the outgoing line branch 2 has no current, the incoming line protection measurement and control device 3 sends the input signal for linkage trip detection to the input switch bank, and the input switch bank is connected to the outgoing line protection measurement and control device 4, The outgoing line protection measurement and control device 4 sends an opening command to the load switch, the load switch is opened, and the faulty outgoing line branch is isolated. In order not to affect the power supply of the non-fault outgoing line branch, the outgoing line protection measurement and control device 4 sends a switch-in signal to the open-in switch bank, and sends the linkage closing command to the incoming line protection measurement and control device 3, which is controlled by the incoming line protection measurement and control device 3 The circuit breaker switch is closed, and the non-fault outgoing branch circuit resumes normal power supply. A large-scale power outage is avoided, the economic loss caused by the power outage is reduced, and the traditional load switch can still be used on the outgoing line branch without using a circuit breaker switch as a replacement, which reduces the equipment cost.

In the protection of the incoming line 1 and outgoing line of the traditional switch station, the circuit breaker switch is equipped with a digital relay protection device, and the load switch is equipped with a fuse protection device. Since the fuse is a one-time component, it needs to be replaced after use. As a preferred embodiment, the incoming line protection measurement and control device 3 and the outgoing line protection measurement and control device 4 are both digital relay protection devices. The digital relay protection device can be used repeatedly, which saves the cost of replacing and purchasing fuses, and avoids repeated investment in construction.

As an embodiment, each outgoing line protection measurement and control device 4 is equipped with an outgoing line side current transformer and an outgoing line side control unit. The outlet-side current transformer is connected to the outlet branch 2 where it is located, and the current data on the outlet branch 2 is detected and sent to the outlet-side control unit. The outgoing line side control unit is connected to the load switch to control the action of the load switch, and is connected to the input switch bank to control the action of the circuit breaker switch. The incoming line protection measurement and control device 3 is provided with an incoming line side current transformer and an incoming line side control unit. The current transformer at the incoming line side is connected to the incoming line 1, detects the current data of the incoming line 1 and transmits it to the incoming line side control unit. The incoming line side control unit controls the action of the circuit breaker switch. The transformation ratio of the current transformer on the incoming line side is greater than the transformation ratio of the current transformer on the outgoing line side. When a fault occurs in the outgoing line branch 2, the fault current will first exceed the overcurrent protection setting in the incoming line protection measurement and control device, and the outgoing line The protection measurement and control device starts the protection action first. The transformation ratio of the current transformer refers to the current ratio between the primary winding and the secondary winding of the current transformer.

As a preferred embodiment, referring to Fig. 2 for details, each outgoing line protection measurement and control device 4 is provided with an outgoing line side terminal block, including outgoing line linkage tripping terminals, outgoing line linkage closing terminals, outgoing line linkage opening terminals, load tripping terminals and load detection terminal. The incoming line protection measurement and control device 3 is provided with an incoming line side terminal block, including a bus trip terminal, an incoming line linkage trip terminal, an incoming line linkage closing terminal and an incoming line linkage opening terminal.

There are two outgoing-line linkage tripping terminals, namely the first terminal and the second terminal. The control unit on the outgoing line side is connected to the input switch bank through the first terminal, and is connected to the incoming line side control unit by the input switch bank. The outgoing line side control unit is connected to the prompt circuit of the incoming line protection measurement and control device through the second terminal. There are also two outgoing line linkage closing terminals, which are the third terminal and the fourth terminal. The control unit on the outgoing line side is connected to the input switch bank through the third terminal, and is connected to the control unit on the incoming line side by the input switch bank. , the outgoing line side control unit is also connected to the prompt circuit of the incoming line protection measurement and control device through the fourth terminal. The control unit on the outgoing line side controls the opening and closing of the input switches corresponding to the associated tripping and closing on the input switch row through the first terminal and the third terminal linked tripping and linked closing commands respectively. After the input switch connected to the linkage tripping or linkage closing circuit is closed and turned on, the linkage tripping or linkage closing command is sent to the incoming line side control unit of the incoming line protection measurement and control device. At the same time, the control unit on the outgoing line side sends a prompt signal of linkage tripping and linkage closing to the prompt circuit of the incoming line protection measurement and control device through the second terminal and the fourth terminal respectively, and the incoming line side control unit detects the signal of the incoming line protection measurement and control device. After prompting the corresponding signal sent by the circuit, the corresponding control command is sent to the circuit breaker switch to control the tripping or closing of the circuit breaker switch. The prompt circuit of the incoming line protection measurement and control device includes an incoming line linkage tripping terminal and an incoming line linkage closing terminal, and the second terminal and the fourth terminal are respectively connected to the incoming line linkage tripping terminal and the incoming line linkage closing terminal. The outgoing line linkage open-in terminal is connected to the detection circuit of the incoming line protection measurement and control device to judge the operating state of the circuit breaker switch. The detection circuit of the incoming line protection measurement and control device includes an incoming line linkage opening terminal, and the outgoing line linkage opening terminal is connected to the incoming line linkage opening terminal. The terminal block on the outgoing line side is also provided with a load trip terminal and a load detection terminal. The control unit on the outgoing line side sends an opening command to the load switch through the load trip terminal to control the action of the load switch, and the control unit on the outgoing line side passes the load detection terminal. Determine the operating state of the load switch. The control unit at the incoming line side is connected to the circuit breaker switch through the bus trip terminal to control the action of the circuit breaker switch. The switch row is composed of switches connected in parallel. When the detection circuit performs signal detection, as long as one switch has a switch input signal so that the control unit on the outgoing line side is connected to the control unit on the incoming line side, it can be detected by the detection circuit. detected.

In this preferred embodiment, taking the TW816PZ incoming line protection measurement and control device and the TW816PZ outgoing line protection measurement and control device as examples, the steps of the linkage control method are as follows: the outgoing line side current transformer in the outgoing line protection measurement and control device detects and sends to the outgoing line side control unit, when the outlet side control unit judges that a short-circuit fault occurs in the outlet branch, the outlet side control unit is connected to the input switch bank through the first terminal, and the input switch bank is connected to the input side control unit. The side control unit is connected to the incoming line linkage trip terminal through the second terminal. The incoming line side control unit sends a trip command after detecting the linkage trip signal of the incoming line linkage trip terminal, and the circuit breaker switch trips, cutting off the power supply of the entire power supply area of the switch station. powered by. In order to avoid misoperation, the incoming line side control unit is connected to the circuit breaker switch through the incoming line linkage input terminal, judges whether the circuit breaker switch has tripped, and detects the current signal of the incoming line through the incoming line side transformer. After it is determined that the circuit breaker switch has tripped, the tripped command is sent to the control unit on the outgoing line side through the outgoing line linkage opening terminal, and the outgoing line side control unit sends the opening command to the load switch through the load trip terminal, and the load switch is opened. The outgoing branch circuit is disconnected from the power supply. In order to avoid misoperation, the control unit on the outgoing line side detects whether the load switch has been opened through the load detection terminal. The row is connected to the control unit on the incoming line side, while the control unit on the outgoing line side is connected to the incoming line linkage closing terminal through the fourth terminal, and the incoming line side control unit sends a closing signal after detecting the linkage closing signal of the incoming line linkage closing terminal. command, the circuit breaker switch is closed. In order to avoid misoperation, the incoming line side control unit is connected to the circuit breaker switch through the incoming line linkage open terminal to detect the closing signal of the circuit breaker switch.

There are also busbar faults (so-called incoming line faults) and faults caused by load currents on the outgoing line branches on the incoming and outgoing lines of the switchyard. The bus fault is mainly detected by the current transformer on the incoming line side and sent to the incoming line side control unit. The incoming line side control unit sends a trip command through the bus trip terminal to control the circuit breaker switch to trip. The load current fault on the outgoing line branch is mainly detected by the current transformer on the outgoing line side, and sent to the outgoing line side control unit. When the outgoing line side control unit judges the load current fault, it sends an opening command and is controlled by the load trip terminal. The load switch is opened.

Except above-mentioned preferred embodiment, the present invention also has other embodiments, and those skilled in the art can make various changes and deformations according to the present invention, as long as they do not depart from the spirit of the present invention, all should belong to the scope defined in the appended claims of the present invention scope.

Claims (5)

1. A switch station incoming and outgoing line protection device, including an incoming line (1) and several outgoing line branches (2), the incoming line (1) is connected to a circuit breaker switch, and each outgoing line Each branch (2) is equipped with a load switch, which is characterized in that each of the load switches is connected with an outgoing line protection measurement and control device (4), and the circuit breaker switch is connected with an incoming line protection measurement and control device (3) , the outgoing line protection measurement and control devices are all connected to a switching input switch row formed by parallel connection of several switching input switches, and the switching input switch row is output to the incoming line protection measurement and control device. 2. The switch station incoming and outgoing line protection device according to claim 1, characterized in that: the incoming line protection measurement and control device (3) and the outgoing line protection measurement and control device (4) are both digital relay protection devices. 3. The switch station incoming and outgoing line protection device according to claim 2, characterized in that: each outgoing line protection measurement and control device (4) is equipped with an outgoing line side current transformer and an outgoing line side control unit, and the incoming line The line protection measurement and control device (3) is equipped with a current transformer on the incoming line side and a control unit on the incoming line side; Current transformer on the outlet side: connect to the outlet branch (2), detect the current data on the outlet branch (2) and send it to the control unit on the outlet side; Outlet side control unit: connected to the load switch to control the action of the load switch, and connected to the input switch bank to control the action of the circuit breaker switch; Current transformer at the incoming line side: connected to the incoming line (1), detects the current data of the incoming line (1) and transmits it to the control unit at the incoming line side; Line side control unit: controls the action of the circuit breaker switch. 4. The switch station incoming and outgoing line protection device according to claim 3, characterized in that: each outgoing line protection measurement and control device (4) is equipped with an outgoing line side terminal block, including outgoing line linkage tripping terminals, outgoing line linkage closing There are two outgoing line linkage tripping terminals, the first terminal and the second terminal respectively. The control unit on the outgoing line side is connected to the input switch bank through the first terminal, and the input switch bank It is connected to the control unit on the incoming line side, and the control unit on the outgoing line side is connected to the prompt circuit of the incoming line protection measurement and control device through the second terminal. There are also two outgoing line linkage closing terminals, which are respectively the third terminal and the fourth terminal. The side control unit is connected to the input switch bank through the third terminal, and the input switch bank is connected to the incoming line side control unit, and the outgoing line side control unit is also connected to the prompt circuit of the incoming line protection measurement and control device through the fourth terminal. The control unit on the outgoing line side controls the operation of the input switch row through the first terminal and the third terminal respectively, and at the same time, the control unit on the outgoing line side sends linkage tripping and linkage to the prompt circuit of the incoming line protection measurement and control device through the second terminal and the fourth terminal respectively. Closing prompt signal, the outgoing line linkage opening terminal is connected to the detection circuit of the incoming line protection measurement and control device to judge the operating state of the circuit breaker switch, and the outgoing line side terminal row is also provided with a load trip terminal and a load detection terminal, The outlet-side control unit sends an opening command to the load switch through the load trip terminal to control the action of the load switch, and the outlet-side control unit judges the action state of the load switch through the load detection terminal. 5. The switch station incoming and outgoing line protection device according to claim 4, characterized in that: the incoming line protection measurement and control device (3) is provided with an incoming line side terminal block, including a bus trip terminal, an incoming line linkage trip terminal, Incoming line linkage closing terminal and incoming line linkage opening terminal, the prompt circuit of the incoming line protection measurement and control device includes an incoming line linkage tripping terminal and an incoming line linkage closing terminal, and the second terminal and the fourth terminal are respectively connected to Incoming line linkage trip terminal and incoming line linkage closing terminal, the detection circuit of the incoming line protection measurement and control device includes an incoming line linkage opening terminal, and the outgoing line linkage opening terminal is connected to the incoming line linkage opening terminal, so The control unit on the incoming line side is connected to the circuit breaker switch through the bus trip terminal to control the action of the circuit breaker switch.

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