JPS58178268A - Test circuit - Google Patents

Abstract

PURPOSE:To enable flexible use of automatic and manual testing for large and small quantity of sample equipment respectively by controlling both testing modes with a computer in a proper combination adapted for common use. CONSTITUTION:A relay 10 is activated by a signal from a microcomputer to close a contact 10a1. Voltage of a voltage tap (a) on the secondary side of a transformer 2 is fed to a sample equipment 8 through a relay contact 11a1 while it is applied between input terminals x1 and x2 of a digital panel meter 9 through a divider 3 and a contact 11a2 for indication of voltage. In response to the operation of lock switch 6, a contact 6C is opened to lock the automatic testing. With the closing of a manual testing switch 1, voltage on the secondary side of the transformer 2 fed to the sample equipment 8 through a circuit 7-1 of a rotary switch 7 and a contact 6A while it is applied between the terminals x1 and x2 of the meter 9 through the divider 5 and the contact 16a1 for indication.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a test circuit used for testing protective relays, etc., and its purpose is to provide a test circuit that can perform both automatic testing using a microcomputer, etc. and manual testing. A test circuit according to a certain 0 to 1 jiK includes a power supply unit that generates a sound for the amount of electricity required for the test, a manual switching circuit for manually switching the test amount of electricity, an automatic switching circuit for automatically switching the test amount of electricity, and the above-mentioned. Manual switching circuit lock type
A lock circuit that uses l as a start condition for automatic testing, a path (9) that generates an electrical quantity display signal to the p1 data output section in conjunction with the switching operation of the manual switching circuit, and a switching operation of the automatic switching circuit. The present invention will be described in detail below based on the illustrated embodiments. 1 shows an embodiment of the present invention, in which the amount of electricity tested is voltage. In the figure, / is a test switch, C is a transformer as a power source, and the secondary side is provided with a predetermined voltage cod 141 and C. J, u, and j are voltage dividers, and B is a locking switch, which is a contact point that immediately closes or opens.

4B, and a contact 40 that is in the opposite open/close state. 7 is a rotary switch with 8 contacts and 2 circuits, and 7 is a device to be tested (for example, a maintenance II relay), which is connected between output terminals TL and 11. 9 is a digital panel meter as a data output section, 10 to /6 are relays, which are switched by the signal from the relay node 0-/JF, i ff microcomputer.Of these, relay 10 is used to start the test. Its & contacts lO&l are connected in parallel with the test switch /. Relays //~/J are used for automatic switching of the test voltage, and each relay contact //al,
/Jul and /Jal are connected to the output terminal t1 and voltage taps 49, 49 and 49 of the transformer. This is because a manual switching circuit is connected in parallel with this automatic switching circuit, which is made up of a contact 1m of the μ-switch ≦ and a rotary switch 70, one of which is connected to an O circuit.

On the other hand, the digital panel meter V connected between the input power terminals via the other circuit 7-4 of the relay 1~14#'i rotary switch 7 and the contact 4B of the locking switch 4 is Input terminal Xl.

Rounding output terminal of X11 data output yx I /1 m
71s power supply 'lt'l and decimal point signal terminal, eb
l e 131 e 'b Lut-Equipped with 91 input terminals /Jam
@ /4'a1. /jjl @ /4a1t- The divided voltages of the voltage dividers j, @, and J are selectively inputted to the decimal point signal terminal b1 *
bl + bl K is the decimal point signal from the micro combinator and the relay slag, /3. /40 contacts/Hiro*@,
Signals from the opening and closing of /jam and /4am are input.

Next, the operation will be described.

(1) Automatic test In the case of an automatic test, when the lock switch 4f is set to the ill state, one of the start conditions for the automatic control circuit (E not shown) controlled by the microcomputer is satisfied by the closing of its contact 4C. . Also, at this time, the manual switching circuit is in the lock state 1 because switch 40 point 4m is open.
There is 1IAK.

Any one of the relays //, /ko, /J is energized by a signal from the microcomputer. For example, when relay /l is energized, point C) @ point //11, //ILI is closed and the voltage tap on the secondary side of transformer CO is selected.

At the same time, the input terminal of the digital panel meter is embarrassing.

Kl is connected to a voltage divider JK@. Further, a signal from the microcomputer is applied to terminal bxK, whereby an appropriate decimal point is displayed in the voltage display of the digital panel meter.

This completes the automatic test preparation. Thereafter, the p-relay 10 is energized by the signal sent from the 9-microcomputer, and its II point IQ&1 is closed.

As a result, the voltage on the secondary side of the transformer - the voltage on the tube is transferred to test machine 1 through relay contact 171K. # is supplied.

At the same time, this voltage is applied between the digital panel meter O input terminals XI eXz via the voltage divider J and the contact //&@f, and the voltage is displayed and the output terminal 71 +
The data from 71*7m is unpacked and the voltage value is stored in the memory of the microcomputer.

After that, when one predetermined test is completed, a signal from the microcomputer is sent to relay 10. // is deactivated one after another,
Return to the initial state.

On the other hand, when the relay saw or /J is energized, the relay contacts 1 and 3a1 and 1 and 3a1 are closed, and the voltage tap or the terminal on the secondary side of the transformer is closed. is selected, a decimal point signal is applied to the terminal tk or b3, and the same operation as described above is performed.

If the switch for one switch is operated so that points 4 and jB are closed, the contact 10 will open, and the conditions for starting the automatic control circuit by the micro combinator will not be established, and the automatic test will be locked. contact 4 of switch 1 for
4] 1SC) A manual switching circuit is formed by closing the circuit. For example, the movable element of the rotary switch 70 has a contact point H! as shown in the figure. When 40 is touched, the voltage tag on the secondary side of the transformer is selected. At the same time, relay /6 is energized, so its contacts /J&1 and /jam are closed, and the input terminals X1eXl of the daisyllel panel meter.
Partial pressure 1 in Seki! j is connected, and the decimal point is connected to the terminal l
By selecting , the decimal point display becomes appropriate for voltage display.

This completes the manual test preparation. When the test switch / is turned on in this state, the voltage on the secondary side of the transformer @JO is transferred to the test equipment lK via the rotary switch 70 (one circuit 7 - / and the lock switch 4011).
At the same time, this voltage is applied to voltage divider S and contact 74al.
'1 to the input terminal X1 of the digital panel meter.
It is applied between eXI and the voltage value is displayed. The manual test is completed when the test switch / is opened at the end of the specified test.0 If you want to change the test voltage in the above manual test, you only need to operate the rotary switch, and the contact port of one circuit 7-/ Or, if you switch to A', A is selected for the voltage tap. At the same time, relay/1 or slag is energized, and its contacts 15a1, lj&l★9, slag &1 and 1s are closed to form a required test circuit, and a manual test can be performed in the same manner as described above.

In the above embodiment, the rotary switch 7 is configured to drive the relay sag ~/6, but if a rotary switch with 8 contacts and 4 circuits is used, the relay sag ~/6 will be driven by the rotary switch 7.
can be omitted. ! Although illustrations and explanations have been omitted, the input power supply end, that is, the relay IO contact/□al and the test
There is a regulator in front of the switch that can be adjusted either automatically or manually9, making it possible to finely set the test voltage. Furthermore, although the test circuit has been illustrated for voltage, it can be implemented similarly for a current test circuit.

(1) Since it is a common type that can perform both automatic and manual tests using Taro Computer and Personal Computer, automatic tests and manual tests can be performed for large-volume models.
For small-volume models, p1 is highly flexible and can be used appropriately for manual testing.

(11) 4 to be tested! The power supply unit for supplying electricity to the device is shared between automatic and manual tests, and the circuit configuration is simple and economical.

(iie) The digital panel meter can be used in common for both automatic testing and manual testing, and the decimal point can be displayed appropriately, making it functionally superior.

(Iψ Automatic testing and manual testing can be simply locked using a locking switch.

[Brief explanation of drawings]

1 is a circuit diagram showing an embodiment of a test circuit according to the present invention; FIG. /...Test switch, Co...Transformer, j-j...
・Voltage divider, 4...Lock switch, 7...Rotary switch, l...Equipment under test, Di...digital panel meter, lO~/4...relay.

Claims (1)

[Claims] (1) A power supply unit that generates the amount of electricity required for the test, a manual switching circuit that manually switches the amount of electricity to be tested, an automatic switching circuit that automatically switches the amount of electricity to be tested, and a lock state a of the manual switching circuit. a lock circuit that makes the automatic test start condition, a circuit that generates an electric quantity display signal in conjunction with the switching operation of the manual switching circuit and applies it to the data output section, and a circuit that operates in conjunction with the switching operation of the automatic switching I step. A test circuit 0 comprising a circuit for applying an electric quantity display signal to a power output and a data output section.