Relay verification device for automatic experiment of hydropower station

Abstract

The utility model discloses a relay verification device for an automatic experiment of a hydropower station. The relay verification device comprises relays KA1, KA2, KA3, KA4 and KA5. The relay base KA1 comprises four pairs of normally open and normally closed contacts, the relay base KA2 and the relay base KA3 comprise three pairs of normally open and normally closed contacts, and the relay base KA4 and the relay base KA5 comprise two pairs of normally open and normally closed contacts; and base power supply contacts A1 and A2 of the relays KA1, KA2, KA3, KA4 and KA5 are connected in parallel, one end of the base power supply contacts A1 and A2 is electrically connected with a relay protection instrument U after parallel connection, and the other end of the base power supply contacts A1 and A2 is electrically connected with a resistance meter R0 through an air switch QF2. The device solves the problems that in the prior art, the number of relays in a large hydropower station is large, time needed for completing verification is long, and manpower and material resources are consumed, and has the advantage that rapid verification of the intermediate relay can be completed with low cost.

Description

Technical Field

[0001] This utility model belongs to the field of relay protection technology, specifically relating to a relay verification device used in hydropower station automation experiments. Background Technology

[0002] In automated equipment, relays are crucial local components, playing a vital role in the safe and stable operation of the equipment. Automatic control relies on the correct operation of relays. If a relay malfunctions or fails to operate, it can lead to malfunctions in the automatic control system, and in severe cases, cause major electrical or mechanical accidents. For the Baihetan Hydropower Station, the reliability of relays is particularly critical, as numerous protective measures depend on their operation. A relay malfunction can cause shutdowns or even the malfunction of high-speed doors. To ensure the normal functioning of relays, they must be calibrated to ensure that their coil resistance, operating and return voltages, and the resistance of each contact point during operation and return are all within normal ranges. Large hydropower stations have numerous pieces of equipment, and to ensure precise control, relay calibration is required during annual unit maintenance. Most relays used in the automatic control systems of large hydropower stations have three or four pairs of contacts. Using conventional methods to calibrate hundreds of relays during intensive unit maintenance is time-consuming and affects the maintenance schedule. Therefore, a relay calibration device for hydropower station automation experiments needs to be designed to solve these problems. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a relay calibration device for automated testing of hydropower stations. This device solves the problem in the prior art that large hydropower stations have a large number of relays, and the time required to complete the calibration is long and the manpower and material resources are large. It has the feature of being able to quickly calibrate intermediate relays at a lower cost.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] The relay calibration device used for hydropower station automation experiments includes relays KA1, KA2, KA3, KA4 and KA5; the base of relay KA1 includes four pairs of normally open and normally closed contacts, the bases of relays KA2 and KA3 include three pairs of normally open and normally closed contacts, and the bases of relays KA4 and KA5 include two pairs of normally open and normally closed contacts; the power supply contacts A1 and A2 of the bases of relays KA1, KA2, KA3, KA4 and KA5 are all connected in parallel, one end of which is electrically connected to the relay protection instrument U, and the other end is electrically connected to the ohmmeter R0 through the circuit breaker QF2.

[0006] Preferably, the first and second normally open contacts of relays KA1, KA2, KA3, KA4 and KA5 are connected in parallel; the first and second normally closed contacts of relays KA1, KA2, KA3, KA4 and KA5 are connected in parallel.

[0007] Preferably, the third set of normally open contacts of relays KA1, KA2 and KA3 are connected in parallel; the third set of normally closed contacts of relays KA1, KA2 and KA3 are connected in parallel.

[0008] Preferably, the four pairs of normally open and normally closed contacts of the KA1 relay are electrically connected to the terminal block, and the power contacts A1 and A2 of the KA1 relay base are electrically connected to the lower end of the circuit breaker QF1, and are electrically connected to the relay protection device U through the circuit breaker QF1.

[0009] Preferably, the normally open contacts 11 and 14, 21 and 24, 31 and 34, 41 and 44 of the KA1 relay base are electrically connected to the terminal block, and the other end is electrically connected to the ohmmeters R1, R2, R3 and R4, respectively; wherein the normally open contacts 11 and 14 are connected to the ohmmeter R1 via the circuit breaker QF3.

[0010] Preferably, the normally closed contacts 11 and 12, 21 and 22, 31 and 32, 41 and 42 of the KA1 relay base are electrically connected to the terminal block, and the other end is electrically connected to the ohmmeters R5, R6, R7 and R8, respectively.

[0011] The beneficial effects of this utility model are as follows:

[0012] 1. This device has low cost. Apart from the external equipment, this device only requires 3 circuit breakers, 9 resistance meters, and some wires. It is low-cost, economical and efficient.

[0013] 2. It is fast and can complete the verification of multiple relays in a short time, which greatly improves maintenance efficiency.

[0014] 3. Fully automatic: This device only requires operating the circuit breaker and outputting voltage through an external device to complete relay verification. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the system connection of this utility model. Detailed Implementation

[0016] Example 1:

[0017] like Figure 1As shown, the relay calibration device used for hydropower station automation experiments includes relays KA1, KA2, KA3, KA4 and KA5; the base of relay KA1 includes four pairs of normally open and normally closed contacts, the bases of relays KA2 and KA3 include three pairs of normally open and normally closed contacts, and the bases of relays KA4 and KA5 include two pairs of normally open and normally closed contacts; the power supply contacts A1 and A2 of the bases of relays KA1, KA2, KA3, KA4 and KA5 are all connected in parallel, one end of which is electrically connected to the relay protection instrument U, and the other end is electrically connected to the ohmmeter R0 through the circuit breaker QF2.

[0018] Preferably, the first and second normally open contacts of relays KA1, KA2, KA3, KA4 and KA5 are connected in parallel; the first and second normally closed contacts of relays KA1, KA2, KA3, KA4 and KA5 are connected in parallel.

[0019] Preferably, the third set of normally open contacts of relays KA1, KA2 and KA3 are connected in parallel; the third set of normally closed contacts of relays KA1, KA2 and KA3 are connected in parallel.

[0020] Preferably, the four pairs of normally open and normally closed contacts of the KA1 relay are electrically connected to the terminal block, and the power contacts A1 and A2 of the KA1 relay base are electrically connected to the lower end of the circuit breaker QF1, and are electrically connected to the relay protection device U through the circuit breaker QF1.

[0021] Preferably, the normally open contacts 11 and 14, 21 and 24, 31 and 34, 41 and 44 of the KA1 relay base are electrically connected to the terminal block, and the other end is electrically connected to the ohmmeters R1, R2, R3 and R4, respectively; wherein the normally open contacts 11 and 14 are connected to the ohmmeter R1 via the circuit breaker QF3.

[0022] Preferably, the normally closed contacts 11 and 12, 21 and 22, 31 and 32, 41 and 42 of the KA1 relay base are electrically connected to the terminal block, and the other end is electrically connected to the ohmmeters R5, R6, R7 and R8, respectively.

[0023] Example 2:

[0024] The working principle of the above-mentioned automatic intermediate relay calibration device is as follows:

[0025] The relay protector determines whether the relay has activated and deactivated by judging the continuity of the contacts between the digital input A and the common terminal N. When the voltage rises to the activation value, the relay activates, and the normally open contacts 11 and 14 of the relay between the digital input A and the common terminal N change from open to closed. The resistance between A and the common terminal N changes from zero to infinite. Therefore, the relay protector determines that the relay has activated, and the output voltage begins to drop. When the voltage drops to the relay's return value, contacts 11 and 14 change from closed to open. The resistance between A and the common terminal N changes from infinite to zero. The relay protection device therefore determines that the relay has reset and stops outputting voltage. In actual testing, ohmmeter R1 is connected in parallel with the normally open contacts 11 and 14 of the relay. Although the internal resistance of the ohmmeter is large, it is not infinite. The relay protection device always determines that the switch input is in the ON state. Therefore, when the voltage rises to the relay's operating value, the relay protection device's switch input signal is always OFF, making it impossible to determine that the relay has activated. By using the newly added circuit breaker QF3, QF3 is opened before the voltage is increased, ensuring that the relay protection device's switch input signal is OFF. After reaching the operating voltage, contacts 11 and 14 are closed. Closing QF3 at this time does not affect the parallel resistance being in the ON state, allowing the relay protection device to correctly determine that the relay has activated. Opening QF3 before the relay reaches its return value ensures that the resistance of contacts 11 and 14 becomes the sole criterion for the relay protection device's switch input signal, allowing the relay protection device to correctly determine the relay reset signal.

[0026] Example 3:

[0027] The working process of the above-mentioned automatic intermediate relay calibration device is as follows:

[0028] Before use, first connect the voltage outputs UA and UN of the external relay protection device to the incoming line of circuit breaker QF1, and connect the switch input A and common terminal N of the relay protection device to the incoming line of circuit breaker QF3. Select the "Auto Increment" and "Action Return" modes for the relay protection device. During the relay calibration process, ensure that all circuit breakers are in the open state before the relay protection device provides voltage. Insert the relay with calibration into the corresponding model base, close QF2, and record the coil resistance R0. Disconnect QF2, close QF3, and record the normally open contact resistances R1, R2, R3, R4 and normally closed contact resistances R5, R6, R7, R8 when the relay is not activated. Close QF1, disconnect QF3, and use the relay protection device to output voltage. After the relay activates, close QF3 and record the normally open contact resistances R1, R2, R3, R4 and normally closed contact resistances R5, R6, R7, R8 when the relay is activated. Disconnect QF3 before the relay reaches the return value. When the relay protection device's output voltage drops to the relay's return value, the device stops applying voltage and automatically displays the operating voltage V1 and the return voltage value V2. Record V1 and V2. Observe the data V1, V2, R0, R1, R2, R3, R4, R5, R6, R7, and R8. If all meet the national standard requirements, the relay is qualified.

[0029] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The embodiments and features described in this application can be arbitrarily combined without conflict. The protection scope of this utility model should be defined as the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. A relay verification device for hydropower plant automation experiment, characterized in that: The relay KA1, KA2, KA3, KA4 and KA5; KA1 relay base includes four pairs of normally open and normally closed contact, KA2 and KA3 relay base includes three pairs of normally open and normally closed contact, KA4 and KA5 relay base includes two pairs of normally open and normally closed contact; the base power contact A1 and A2 of relay KA1, KA2, KA3, KA4 and KA5 are connected in parallel, and one end of the parallel connection is electrically connected with the relay protection instrument, and the other end is electrically connected with the resistance table R0 through the air switch QF2.

2. The relay verification device for the automation experiment of hydropower station according to claim 1, characterized in that: The first group and the second group of normally open contact of the relay KA1, KA2, KA3, KA4 and KA5 are connected in parallel; the first group and the second group of normally closed contact of the relay KA1, KA2, KA3, KA4 and KA5 are connected in parallel.

3. The relay verification device for the automation experiment of hydropower station according to claim 1, characterized in that: The third group of normally open contact of the relay KA1, KA2 and KA3 are connected in parallel; the third group of normally closed contact of the relay KA1, KA2 and KA3 are connected in parallel.

4. The relay verification device for the automation experiment of hydropower station according to claim 1, characterized in that: The four pairs of normally open and normally closed contact of the KA1 relay are electrically connected to the terminal block, the power contact A1 and A2 of the KA1 relay base are electrically connected with the lower end of the air switch QF1, and are electrically connected with the relay protection instrument through the air switch QF1.

5. The relay verification device for hydropower plant automation laboratory experiment according to claim 1, characterized in that: The normally open contact 11 and 14, 21 and 24, 31 and 34, 41 and 44 of the KA1 relay base are respectively electrically connected with the terminal block, and the other ends are respectively electrically connected with the resistance table R1, R2, R3 and R4; wherein the normally open contact 11 and 14 are connected with the resistance table R1 through the air switch QF3.

6. The relay verification device for hydropower plant automation laboratory experiment according to claim 1, characterized in that: The normally closed contact 11 and 12, 21 and 22, 31 and 32, 41 and 42 of the KA1 relay base are respectively electrically connected with the terminal block, and the other ends are respectively electrically connected with the resistance table R5, R6, R7 and R8.

Images