CN103983914A - Testing device and method for secondary circuit of electric isolating knife switch - Google Patents

Abstract

A test device and test method for the secondary circuit of an electric isolation knife switch, which consists of four AC input terminals, a three-phase AC air switch, three control output terminals, six phase detection terminals, a red light HD, and a green light LD , two relays K1 and K2, the control output terminal G1 is connected to the remote control public terminal of the electric operating mechanism of the isolated knife switch, the G3 terminal is connected to the remote control closing terminal, and the G33 terminal is connected to the remote control opening terminal; the phase detection terminal is connected to the motor The upper end of the air switch of the secondary circuit is connected to the secondary line of the opposite end that is separated from the wiring of the motor body; the AC input terminal is connected to the external power supply, the AC air switch QF is closed, and the closing button and opening button are respectively pressed for testing. Using this device to test the secondary circuit of the electric isolation knife switch can avoid various failures in the secondary circuit that lead to electric opening and closing, and ensure that the isolation knife switch is put into operation correctly; it can shorten the maintenance cycle of the electric isolation knife switch, and reduce the scope and time of power outages , to ensure the stable operation of the power system.

Description

Electric isolation switch secondary circuit test device and test method

technical field

The invention relates to a test device and a test method for a secondary circuit of an electric isolation knife switch, and belongs to the field of test for comprehensive automation equipment of electric power systems.

Background technique

Isolation switch is a main equipment used in conjunction with circuit breakers in substations and transmission and distribution lines. With the increasing degree of automation of the power grid and the widespread implementation of unattended stations, more and more electric switch put into operation in the grid. The isolating switch, especially the bus isolating switch, is not only a device in the switch compartment, but also connected to the bus. The maintenance of the bus isolating switch requires both the bus power failure and the switching interval, which brings considerable problems to the maintenance of the bus isolating switch. Especially when the electric mechanism of the isolating knife switch operated by the bus is faulty, the verification test cannot be performed, so many electric isolating knife switches are in an abnormal state, which brings great hidden dangers to the operation of the power grid. At the same time, there are many components in the secondary circuit of the electric isolation knife switch, and the failure of any component will lead to the failure of normal opening and closing, especially when dealing with such failures, the test cannot be carried out after replacing the components.

At this stage, there has always been a gap in equipment technology for testing the secondary circuit of the electric isolating knife switch, and there is no special testing device. In a new substation, under normal circumstances, when all the secondary lines are connected, the knife switch is hand-operated to the middle position, and then the remote control test is performed, which is time-consuming and laborious, and accidentally causes the motor to burn out. In substations that are already in operation, when replacing electric knife switches or dealing with circuit faults, the test is generally not possible. For example, a complete test requires bus power failure and changes in operation mode, causing unnecessary safety hazards. Especially for 110kV and above voltage level electric isolation knife switch, it is very difficult to cut off the bus power, or the power failure time is very short. If this test is not carried out, it will seriously affect the safe operation of the power grid or cause the power failure time to be too long and the power failure scope to expand. In short, once there is a problem with the secondary circuit of the electric isolation knife switch, it will cause harm in the following three aspects. ⑴ During the remote control test, if the circuit is wrong, it is easy to cause the motor to burn out and the components to be damaged. ⑵ It is impossible to check whether the wiring of the secondary circuit is correct, and it is impossible to achieve pre-accident pre-control; ⑶ A lot of manpower, material resources and time are wasted. It is a very important subject to invent a test device to verify the correctness of the secondary circuit of the electric isolating knife switch according to the actual situation on site.

Contents of the invention

In order to avoid the above disadvantages, the present invention proposes a safe and reliable test device for the secondary circuit of the electric isolation knife switch and a corresponding test method. The test device is easy to operate and can thoroughly check the secondary circuit of the electric isolation knife switch. Pre-accident pre-control ensures the safe and stable operation of the power grid.

The technical solution adopted to solve the problem of the present invention is: the test device consists of four AC input terminals, a three-phase AC air switch, three control output terminals, six phase detection terminals, a red light HD, a green light LD, two The N terminal of the AC input terminal is connected to the control output terminal G1 through the stop button; one end of the phase detection terminal U1 is connected to the upper end of the AC air switch, and the other end is connected to the control output terminal G3 through the closing button and the coil of relay K1. Connect the control output terminal G33 through the opening button and the relay K2 coil, and connect the phase detection terminals V1 and W1 to the upper end of the AC air switch respectively; the first excitation normally open contacts on the relays K1 and K2 are connected through the phase detection terminal U2, and the phase detection terminals The second excitation normally open contact on relay K1 and K2 is connected through phase detection terminal V2, and the third excitation normally open contact on relay K1 and K2 is connected through phase detection terminal W2; the red light string is in the closing circuit, and the green light string is in the opening circuit .

The test method for the secondary circuit of the electric isolating knife switch is: the control output terminal G1 is connected to the remote control public terminal of the electric operating mechanism of the isolating knife switch, the G3 terminal is connected to the remote closing terminal of the electric operating mechanism of the isolating knife switch, and the G33 terminal is connected to the remote control terminal of the electric operating mechanism of the isolating knife switch. The remote control opening terminal of the brake electric operating mechanism is connected; the phase detection terminals U1, V1, W1 are respectively connected to the upper end of the AC air switch of the motor secondary circuit, and the phase detection terminals U2, V2, W2 are respectively connected to the opposite end of the motor body wiring Connect the secondary line; connect the AC input terminals U, V, W, and N to the external power supply, close the AC air switch QF, and press the closing button. If the red light is on, it means that the motor circuit and phase sequence are correct. Otherwise, find out the reason. Until the red light is on; press the opening button, the green light is on, indicating that the motor opening circuit is correct, otherwise you should find out the reason until the green light is on.

The positive effect of the present invention is: it is possible to check the correctness of the secondary circuit of the electric isolation switch, especially the phase sequence of the opening and closing motor; when the switch is rebuilt and expanded to maintain the switch, the busbar runs with electricity, and the actual electric operation cannot be performed. And the test method can verify the correctness of the secondary circuit of the electric isolation switch and ensure the correctness of the electric operation of the isolation switch connected to the operating grid; it can thoroughly check the secondary circuit of the electric isolation switch to avoid various errors; The test can be carried out when the switch is not installed, which shortens the power outage time of the isolated switch, improves labor efficiency, and ensures the stable operation of the power system.

Description of drawings

Fig. 1 is a schematic diagram of the test principle of the present invention; Fig. 2 is a conventional electric isolation knife switch control and motor circuit diagram.

Detailed ways

As shown in Figure 1, the test device consists of four AC input terminals, a three-phase AC air switch, three control output terminals, six phase detection terminals, a red light, a green light, and two relays. Terminal U terminal 19 is connected to terminal 1 of AC air switch 16, terminal V 20 is connected to terminal 3 of AC air switch 16, terminal W 21 is connected to terminal 5 of AC air switch 16, terminal N 18 is connected to terminal 1 of stop button 4 Connected; control output terminal G1 terminal 6 is connected with stop button 3 terminal 2, G3 terminal 7 is connected with one end of relay K ₁ 5 coil, G33 terminal 9 is connected with one end of relay K ₂ 8 coil; phase detection terminal U ₁ terminal 13 It is connected with terminal 2 of AC air switch 16, V ₁ terminal 14 is connected with terminal 4 of AC air switch 16, W ₁ terminal 15 is connected with terminal 6 of AC air switch 16; phase detection terminal U ₂ terminal 10 is connected with relay K ₁ 5 The excitation normally open contact terminal 1 of the relay K ₁ 5 is connected with the excitation normally open contact terminal 1 of the relay K ₂ ; the phase detection terminal V ₂ terminal 11 is connected with the excitation normally open contact of the relay K ₁ 5 The contact ends are connected, wherein the excitation normally open contact 3 of the relay K ₁ 8 is connected with the excitation normally open contact 3 of the relay K ₂ ; the phase detection terminal W ₂ terminal 12 is connected with the excitation normally open contact 5 of the relay K ₁ 5, Wherein the excitation normally open contact terminal 5 of the relay K ₁₅ is connected with the excitation normally open contact terminal 5 of the relay K ₂ 8 .

Its test method is:

(1) The AC input terminals U, V, W, and N in Figure 1 are connected to the power supply of the external terminal box;

(2) The control output terminals G1, G3, G33 in Figure 1 are connected to the G1, G3, G33 terminals in Figure 2;

(3) The phase detection terminals U1, V1, W1 in Figure 1 are connected to the U1, V1, W1 terminals in Figure 2;

(4) Disassemble the U2, V2, W2 terminal motor end in Figure 2, and get rid of the motor;

(5) The phase detection terminals U2, V2, W2 in Figure 1 are connected to the U2, V2, W2 terminals in Figure 2;

(6) Close the AC air switch 16;

(7) Press the closing button HA 3, if the red light 17 is on, it means that the motor circuit and phase sequence are correct, otherwise you should find out the reason until the red light is on;

(8) Press the opening button FA 2, the green light 1 is on, indicating that the motor opening circuit is correct, otherwise you should find out the reason until the green light is on.

(9) During the test, if you need to stop, press the stop button TA 4.

(10) Remove the test wiring, restore the motor terminal wiring, and the test is completed.

(11) According to the above traffic light instructions, it is judged that the secondary circuit of the electric isolation switch is correct.

Claims (2)

1. An electric isolation knife switch secondary circuit test device is characterized in that it consists of four AC input terminals, a three-phase AC air switch, three control output terminals, six phase detection terminals, a red light HD, It consists of a green light LD and two relays K1 and K2, in which the N terminal of the AC input terminal is connected to the control output terminal G1 through the stop button; one end of the phase detection terminal U1 is connected to the upper end of the AC air switch, and the other end is connected to the closing button and the coil of the relay K1 The control output terminal G3 is connected to the control output terminal G33 through the opening button and the coil of the relay K2, and the phase detection terminals V1 and W1 are respectively connected to the upper end of the AC air switch; the first excitation normally open contacts on the relays K1 and K2 are connected through the phase detection terminal U2 , the second excitation normally open contact on the relay K1, K2 is connected through the phase detection terminal V2, the third excitation normally open contact on the relay K1, K2 is connected through the phase detection terminal W2; the red light string is in the closing circuit, the green light string in the opening circuit. 2. The electric isolation switch secondary circuit test device according to claim 1, its test method is: the control output terminal G1 end is connected with the remote control common terminal of the isolation switch electric operating mechanism, and the G3 terminal is electrically operated with the isolation switch The remote control closing terminal of the mechanism is connected, and the G33 terminal is connected to the remote control opening terminal of the electric operating mechanism of the isolation knife switch; the phase detection terminals U1, V1, and W1 are respectively connected to the upper end of the AC air switch of the motor secondary circuit, and the phase detection terminals U2, V2 and W2 are respectively connected to the secondary wires at the opposite end of the motor body; the AC input terminals U, V, W, and N are connected to the external power supply, close the AC air switch QF, and press the closing button, such as the red light is on It means that the motor circuit and phase sequence are correct, otherwise you should find out the reason until the red light is on; press the opening button, the green light is on to indicate that the motor opening circuit is correct, otherwise you should find out the reason until the green light is on.