CN206848431U - A kind of intelligent electric energy meter device of detecting magnetic holding relays in batches - Google Patents

Abstract

A batch detection device for magnetic latching relays of smart electric energy meters, including: isolation transformer (T), 16 thyristor dielectric solid state relays (SCR1~SCR16), current transformer (CT), sampling resistor (R), electronic load, DSP and LCD screen. The isolation transformer is connected to the 220V AC power supply, 16 tested relays (K1~K16) are connected in series on the same current loop, and each tested relay is connected in parallel with a thyristor dielectric solid state relay; the electronic load is connected in series on the current loop, DSP The output terminal of the current transformer is connected to the control terminal of the electronic load; the current transformer samples the current value of the current loop, and the sampling resistor is connected in parallel to the output terminal of the current transformer, and the collected current value is converted into a voltage signal, and input to the DSP, and the DSP judges Whether the detected current is within the allowable range, and then control the electronic load and change the resistance of the electronic load; the DSP output is connected to the LCD screen, which can display the current value and the number of times each relay operates in real time.

Description

A batch detection device for magnetic latching relays of smart electric energy meters

technical field

The utility model relates to a batch detection device for a magnetic latching relay of an intelligent electric energy meter, which belongs to the technical field of electric energy measurement.

Background technique

In recent years, my country's smart grid has entered the stage of comprehensive construction. With the rapid development of smart grid, smart energy meter, as an important part of smart grid, has been widely used. When the user is in arrears, the remote master station/power sales system can send a trip command to cut off the power for the user; after the user recharges, the remote master station/power sales system will send a closing command to close the switch for the user. In the electric energy meter, the load switch plays the role of turning on and off the current, so the reliable operation of the magnetic latching relay has a non-negligible effect on the normal operation of the power system.

According to the magnetic latching relay industry standard JB/T10923-2010 "Magnetic latching relay for electronic energy meters" and the relevant requirements of the State Grid Corporation of China's smart energy meter technical standards, the electrical life test of the magnetic latching relay needs to be switched on and off 6000 times (300 times/ Hours), the number of tests is large and time-consuming, and the State Grid Corporation of China has a large number of smart energy meter types and suppliers for each bidding. The current detection device cannot realize batch simultaneous detection of magnetic latching relays, which seriously affects the detection efficiency.

Contents of the invention

The purpose of the utility model is, in order to overcome the deficiencies of the prior art, to provide a batch detection device for magnetic latching relays of smart electric energy meters, which is used for batch detection of magnetic latching relays of intelligent electric energy meters.

The technical scheme of the utility model is a batch detection device for magnetic holding relays of smart electric energy meters, including isolation transformer T, 16 thyristor medium solid state relays, current transformer CT, sampling resistor R, electronic load, DSP and liquid crystal screen .

The primary side of the isolation transformer is connected to the 220V AC power supply; on the secondary side of the isolation transformer, 16 tested relays (K1-K16) are connected in series on the same current loop, and each tested relay is connected in parallel with a thyristor dielectric solid state Relays (SCR1～SCR16); the electronic load is connected in series on the current loop, and the output terminal of the DSP is connected to the control terminal of the electronic load; in the current loop connected in series on the primary side of the current transformer, the sampling resistor is connected in parallel to the output terminal of the current transformer, The sampling resistor is connected to the DSP; the DSP is connected to the electronic load.

The sampling resistor converts the current value collected from the current transformer into a voltage signal and inputs it to the DSP.

The DSP judges whether the detected current is within the allowable range, and then controls the electronic load to change the resistance value of the electronic load; the output of the DSP is connected to the LCD screen, and the LCD screen can display the current value and the number of actions of each relay in real time.

The test principle of the device is as follows: at the beginning of the test, all the tested relays are in the closed state, and all the thyristor dielectric solid state relays are in the disconnected state, and the resistance value of the electronic load is determined to ensure that the current is within the allowable range; To perform a switch-on test on the relay, first disconnect the tested relay K1, and then close the silicon-controlled dielectric solid-state relay SCR1. Due to the large conduction voltage drop of the solid-state relay, the current in the line will decrease, and the DSP will judge the detected Whether the current is within the allowable range, and then control the electronic load, change the resistance of the electronic load so that the current is within the allowable range, and carry out the test in sequence until all 16 tested relays have completed the switch-on test; at this time, all the tested relays are In the open state, all thyristor dielectric solid state relays are in the closed state. Then perform a closing test on the tested relay K1, first disconnect the SCR medium solid-state relay SCR1, and then close the tested relay K1, the same DSP adjusts the electronic load according to the real-time current value to ensure that the current is within the allowable range, according to The tests are carried out sequentially until all 16 tested relays have completed the closing test; at this time, all the tested relays are in the closed state, and all the thyristor dielectric solid state relays are in the open state. In this way, a pull-on test of all relays under inspection is completed, the number of on-off times is completed according to the technical standards, and the above test is repeated until the end of the test.

Compared with the prior art, the utility model has the beneficial effects that: the utility model provides a device for batch detection of magnetic latching relays of smart electric energy meters, which can carry out batch detection of magnetic latching relays of intelligent electric energy meters.

Description of drawings

Fig. 1 is the circuit schematic diagram of the utility model device.

detailed description

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail:

Shown in Fig. 1 is the structural representation of the utility model device.

In this embodiment, a batch detection device for magnetic latching relays of an intelligent electric energy meter includes an isolation transformer T, 16 thyristor dielectric solid state relays SCR1-SCR16, a current transformer CT, a sampling resistor R, an electronic load, a DSP and a liquid crystal screen.

The isolation transformer is connected to the 220V AC power supply, and 16 tested relays K1-K16 are connected in series on the same current loop, and each tested relay is connected in parallel with a thyristor dielectric solid state relay; the electronic load is connected in series on the current loop, and the output of the DSP terminal is connected to the control terminal of the electronic load; in the current loop connected in series with the primary side of the current transformer; the sampling resistor is connected in parallel to the output terminal of the current transformer, and the collected current value is converted into a voltage signal, and input to the DSP, and the DSP judges Whether the detected current is within the allowable range, and then control the electronic load, change the resistance of the electronic load, so that the current is within the allowable range (59.8A ~ 60.2A); the DSP output is connected to the LCD screen, and the LCD screen can display the current value in real time And the number of times each relay operates.

At the beginning of the test, all the tested relays are in the closed state, and all the thyristor dielectric solid state relays are in the disconnected state. Determine the resistance value of the electronic load to ensure that the current is within the allowable range; Disconnect the tested relay K1, and then close the SCR solid-state relay SCR1. Due to the large conduction voltage drop of the solid-state relay, the current in the line will decrease, and the DSP will judge whether the detected current is within the allowable range. Then control the electronic load, change the resistance value of the electronic load so that the current is within the allowable range, and carry out tests in sequence until all 16 tested relays have completed the switch-on test; at this time, all the tested relays are in the disconnected state, and all possible The silicon-controlled dielectric solid-state relays are all in the closed state. Then perform a closing test on the tested relay K1, first disconnect the SCR medium solid-state relay SCR1, and then close the tested relay K1, the same DSP adjusts the electronic load according to the real-time current value to ensure that the current is within the allowable range, according to The tests are carried out sequentially until all the 16 tested relays have completed the closing test; at this time, all the tested relays are in the closed state, and all the thyristor dielectric solid state relays are in the disconnected state, thus completing the testing of all the tested relays. A pull-on test. According to the requirements of the relevant standards of the magnetic latching relay, repeat the above test at a current of 60A, make and break 6000 times until the end of the test.

Claims (3)

1. A batch detection device for magnetic latching relays of smart watt-hour meters, characterized in that, said device comprises isolation transformers, 16 thyristor medium solid-state relays, current transformers, sampling resistors, electronic loads, DSP and liquid crystal screens; The primary side of the isolation transformer is connected to the 220V AC power supply; on the secondary side of the isolation transformer, 16 tested relays are connected in series on the same current loop, and each tested relay is connected in parallel with a thyristor dielectric solid state relay; the electronic load is connected in series In the current loop, the output terminal of the DSP is connected to the control terminal of the electronic load; in the current loop where the primary side of the current transformer is connected in series, the sampling resistor is connected in parallel to the output terminal of the current transformer, and the sampling resistor is connected to the DSP; the DSP is connected to the electronic load. 2. A batch detection device for magnetic latching relays of a smart energy meter according to claim 1, wherein the sampling resistor converts the current value collected from the current transformer into a voltage signal and inputs it to the DSP. 3. A batch detection device for magnetic latching relays of a smart electric energy meter according to claim 1, wherein the DSP judges whether the detected current is within the allowable range, and then controls the electronic load to change the resistance of the electronic load ; The DSP output is connected to the LCD screen, and the LCD screen can display the current value and the number of actions of each relay in real time.