Homemade Relay Voltage Current Parameter Checker, RELAY TESTER
Keywords: Homemade Relay Voltage Current Parameter Checker
Homemade relay voltage current parameter calibrator
The author developed a voltage for relay protection, current relay tester. It is easy for technicians to check and adjust the stamping of relays.
When assembling the relay protection screen. To ensure the reliability of the protection screen. Each time you have to operate the voltage value, the operating current value, the voltage value, the release of the voltage value, and the discharge current value is verified. These projects are completed by a calibrator of our outsourcing. The advantages of this calibrator of the purchase are all functional, in addition to the validated voltage, except, the relay parameters such as the impedance, frequency, and the like can be verified. The disadvantage is that the calibrator is very large, and it is similar to the size of the household suitcase, and it is very heavy. Every time you use it, you must carry it, it is very inconvenient to use. To this end, we decided to make a simple calibrator. To measure the voltage and current value of the generally verified, discard the calibration function of the non-usage parameters, and the selected device is as appropriate, so that the volume of the calibrator is greatly reduced. Volume portable.
The principle of circuit is shown in Figure 1, and the physical schematic is shown in Figure 2.
First, circuit structure
1. The current relay check circuit is constituted by a single-phase self-coupling device Ty, a high pressure capacitor C, a current transformer LH, an input button AN2, an output current switch S2, and a current table A. Current relay check circuit.
2. The voltage relay check circuit is constituted by the pressure regulator Ty, the rectifier bridge heap QL, the DC output switch S1, the point button AN1, and the voltage gauge V.
In the current relay calibration circuit, the purpose of the primary capacitance C of the current transformer LH is to increase the impedance of the voltage regulator output loop. This is to prevent the impedance of the regulator output circuit too low, slightly not paying attention, once the voltage regulator output voltage is high, it may burn the risk of the regulator; the second is to make the operating sensitivity too high, as long as Missing the output voltage of a presser voltage, and the secondary current of the current transformer LH is very large, it is difficult to fine, and the accuracy is not adjusted.
Second, the current relay verification
The first step: first tuned the tuning value of the current relay (such as 10a) to be verified, and the coil is connected to the 3, 4 terminals in Fig. 1, and the regulator is tuned in zero.
Step 2: Closing the power switch S on the panel panel, the power indicator LED is lit, the voltage regulator charges, and then the switch S2 is closed, and the pressure regulator handwheel is slowed slowly. The output voltage is gradually increased by zero, and the current of the current transformer LH is coupled, and the current on the secondary side is also increased, until the current relay moves.
Step 3: Keep the pressure regulator position, disconnect S2, the current relay returns, press the point button AN2, the current relay should be reliable (otherwise, try the pressure regulator to enter the mountain), at this time, the current table is read The value is recorded.
Step 4: The switch S2 is closed, and the voltage regulator output voltage is lowered, and the current relay is returned, and then increase the voltage regulator output voltage, so that the current relay is actuated ... and repeat the third step, the above process repeat Three times, the average value is the current active current value. This action value is compared to its intended value, the smaller the difference, indicating that the current relay has a high accuracy and is qualified. Error absolute value {(set value action value) / set value} *%
After the above steps are completed, the closing S2 slowly reduces the voltage output voltage so that the current relay is just returned, and the value of the current table is recorded. So procedures repeated three times. Take the average of the return value of the current relay. The smaller the difference, the smaller the difference, indicating that the delay of the current relay is small, the higher the action sensitivity.
When all tests are all tested, turn the pressurizer to zero, disconnect the power switch S.
Third, the calibration of the voltage relay
First adjust the tuning value of the voltage relay to be verified, and connect its coil to the checkter 5, 6 terminal. Check the pressure regulator should be in zero, close up the power switch S and the DC output switch S1. Slowly increase the regulator output voltage to make the voltage relay just actions. Keep the voltage regulator output tun electricity, disconnecting S1 Press AN1, and the voltage relay should reliably. Record the value of the voltage meter. This process should be repeated three times, and the average value is taken, that is, the actuation voltage value. The measurement method of the return value and the evaluation of the performance of the performance of the relay is similar to the calibration of the current relay, which is no longer detailed.
Fourth, the component is determined
1. The regulator TY is selected from the 90W miniature, since it is a short time and the relay within 10A is mainly verified.
2 The button and the switch are selected 10A or more and the size is small.
3. The current transformer LH needs homemade, finds a LMZ100 / 5 current transformer, open its shell, the coil is removed, the iron core is insulated, and then 100 线 线 线 线 密 密 密 密 密 密 密 密 密 密 密 密, The vicinity of the vice-around 1.2mm lacquered wire is 10, the original, the second winding is insulated, and the final immersion is dry. Other parameters are shown in Figure 1.
V. Calibration instrument parameters
1. Use power supply voltage 220VAC
2. Maximum output current 15A
3, maximum output voltage 250VAC
4. Working method: short working system
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