CN201766408U - Circuit protection switching device - Google Patents

Abstract

The utility model discloses a line protection switching device, which relates to the technical field of line protection devices. The device has a protection device for automatically identifying whether there is a fault in the line I and line II that need to be protected; a current switching circuit connected to the line I, line II and the protection device; a voltage switch connected to the line I, line II and the protection device Loop: The control power supply and the jumping and closing loop of the switch connected to the line Ⅰ, line Ⅱ and the protection device. The advantages are: saving investment in substation equipment; promoting more convenient and flexible power grid operation.

Description

Line Protection Switching Device

technical field

The utility model relates to the technical field of line protection devices, in particular to a line protection switching device, which is suitable for substations with dual-power supply open-loop operation at and below 110KV.

Background technique

With the continuous improvement of the power grid structure, most of the substations of 11KV and below have changed to a double-circuit open-loop power supply mode. According to the previous design requirements, a set of protective devices must be installed on each of the two power supply lines to meet the requirements of changes in the daily power grid operation mode. Due to the increase in the number of protection devices, the operation mode of the power grid becomes complicated, and the investment in equipment is increased at the same time.

Contents of the invention

In order to solve the above-mentioned shortcomings of the prior art, the utility model provides a line protection switching device, which has the characteristics of low investment in protection equipment, convenient operation, flexible operation mode, etc., and can be used in conjunction with various types of protection devices.

The utility model is realized by the following technical scheme: a line protection switching device, including: line I, line II and a protection device for automatic identification of whether there is a fault in line I, line II, and is characterized in that it also includes: Current switching circuit connected to line Ⅰ, line Ⅱ and protective device; voltage switching circuit connected to line Ⅰ, line Ⅱ and protective device; control power supply and switch jumping and closing circuit connected to line Ⅰ, line Ⅱ and protective device .

The beneficial effects of the utility model are: the equipment investment of the substation is saved; the operation mode of the power grid is promoted to be more convenient and flexible.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Fig. 1 is a block diagram of the utility model;

Figure 2 is a wiring diagram of the current switching circuit;

Fig. 3 is a wiring diagram of a voltage switching circuit;

Figure 4 is a wiring diagram of the tripping and closing circuits for controlling the power supply and switches.

Detailed ways

As shown in Figure 1, the line protection switching device has a protection device for automatically identifying whether there is a fault in line I and line II; a current switching circuit connected to line I, line II and the protection device; connected to line I, line II and The voltage switching circuit connected to the protection device; the control power supply and the jumping and closing circuit of the switch connected to the line I, line II and the protection device.

As shown in Figure 2, the current switching circuit adopts the DL-SD type pressure plate, the middle terminal of the DL-SD type pressure plate is connected to the protection device, and the terminals at the other two ends of the DL-SD type pressure plate are respectively connected to the protection of line Ⅰ and line Ⅱ. CT loop connection. Switching between line Ⅰ and line Ⅱ is realized by switching the pressure plate. The DL-SD type pressure plate is divided into upper and lower layers, so that the normal working current can be connected safely and reliably, and the open circuit caused by poor contact can be prevented. On the other hand, it is also possible to switch the CT circuit when the line is not powered off: put the current circuit in use on the upper laminate, and then short-circuit the CT circuit after detaching it. After confirming that the CT circuit is short-circuited, then connect the lower laminate to the protection The CT circuit is separated; when the CT circuit of the protected line is put into operation, the lower laminate is reliably connected to the protective CT circuit, and then the upper laminate is reliably connected to the protective CT circuit. In Figure 2, it can be clearly seen that the CT loop of line I is in a short-circuit state, and the CT loop of line II is directly connected to the protection device.

As shown in Figure 3, the voltage switching circuit uses LW2-2, 2, 2, 2/F4-8X transfer switches to realize manual voltage switching, and the 2, 6, 10, 14 terminals of the transfer switch are connected to the PT circuit of line Ⅰ , The terminals 1 and 4, 5 and 8, 9 and 12, 13 and 16 of the transfer switch are connected respectively and then connected to the protection device, and the terminals 3, 7, 11 and 15 of the transfer switch are connected to the PT circuit of line II. When the switch is turned to the 1 position, the protection device is connected to the line I voltage circuit; when the switch is turned to the 2 position, the protection device is connected to the line II voltage circuit.

As shown in Figure 4, the switching and closing circuits of the control power supply and switch use LW2-2, 2, 2, 2/F4-8X transfer switches to realize manual switching, and the 2, 6, 10, 14 terminals of the transfer switch are connected to the The control circuit connection of line Ⅰ, the terminals 1 and 4, 5 and 8, 9 and 12, 13 and 16 of the transfer switch are respectively connected and then connected to the protection device, the terminals 3, 7, 11 and 15 of the transfer switch are connected to the line Ⅱ control loop connection. When the switch is turned to position 1, the protection device connects to line Ⅰ to control the power supply and the tripping and closing circuit; when the switch is turned to position 2, the protection device connects to line Ⅱ to control the power supply and the tripping and closing circuit. Whether the opening and closing circuit between the protection device and the switch is intact is monitored by the tripping and closing position relay in the protection device and sends out a warning signal.

Working process: When the current switching pressure plate and the control switch are all turned to the 1 position, the line I is protected; the same current switching pressure plate and the control switch are all turned to the 2 position to protect the line II. The signal part of the protection device does not need to be switched. When it is used for which line, it can be regarded as the signal sent by which line, and it can be treated as a public part.

Claims (4)

1. route protection switching device shifter comprises: circuit I, circuit II and the circuit I, the circuit II that are used for identification automatically have trouble-free protective device, it is characterized in that: also comprise the current switching loop that is connected with protective device with circuit I, circuit II; The voltage switching circuit that is connected with protective device with circuit I, circuit II; The control power supply that is connected with protective device with circuit I, circuit II and the jump, closing loop of switch.

2. route protection switching device shifter according to claim 1; it is characterized in that: DL-SD type pressing plate is adopted in described current switching loop; the indirect terminal of DL-SD type pressing plate is connected with protective device, and the binding post at the other two ends of DL-SD type pressing plate is connected with the protection CT loop of circuit I, circuit II respectively.

3. route protection switching device shifter according to claim 1 is characterized in that: described voltage switching circuit adopts LW2-2,2,2,2/F4-8X change over switch; 2,6,10,14 binding posts of change over switch are connected with the PT loop of circuit I; change over switch 1 and 4,5 and 8,9 and 12,13 be connected with protective device again after 16 binding posts link to each other respectively, 3,7,11,15 binding posts of change over switch are connected with the PT loop of circuit II.

4. route protection switching device shifter according to claim 1 is characterized in that: the jump, closing loop of described control power supply and switch adopts LW2-2,2,2,2/F4-8X change over switch; 2,6,10,14 binding posts of change over switch are connected with the control loop of circuit I; change over switch 1 and 4,5 and 8,9 and 12,13 be connected with protective device again after 16 binding posts link to each other respectively, 3,7,11,15 binding posts of change over switch are connected with the control loop of circuit II.

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