SU100291A1 - Device for measuring the time interval between the closing (or opening) of two contacts - Google Patents

Description

In some cases, for example, when the relay is adjusted for simultaneous closing (or opening) of contacts, it is necessary to measure the small time interval between the closing (or opening) of two contacts and at the same time determine which of the contacts was closed first.

For measuring the small time intervals between the closure (or opening) of two contacts included in some auxiliary circuit, devices are known based on storing the pulse obtained when switching contacts in a "storage capacitor" and then extracting the voltage up to which the capacitor was charged. However, these devices work only with one specific sequence of closing (or opening) of contacts.

The proposed device, related to the same type of devices, consists of three main components: 1) a set of resistances connected according to the bridge scheme; 2) a memory cascade containing “memory capacitors and diodes connected to the output diagon. An indicated bridge, and 3) an electrical measuring device connected to the output of the memory cascade and showing P1, its measured time interval.

A feature of the proposed device is the ability to determine the order of contact triggering.

This is achieved by connecting the contacts, the time interval between the closing or opening moments of which is connected to the measurement, to the resistance of the adjacent shoulders of the bridge so that when one of the contacts is triggered, a rectangular current pulse occurs at the output of the bridge, which stops when the other contact is triggered determined by the contact sequence. As a measuring instrument, an instrument is used in which the direction of deflection of the indicator is determined by the polarity of the current pulse.

The drawing shows a circuit diagram of the proposed device.

MOCT A, formed by resistances 1 - Re, is the first device node. It serves to transform the measured time interval between the closure (or opening) of the contacts / and // B the direct molten current pulse, the polarity of which depends on the sequence of the action of the contacts.

The elements of the bridge are chosen so that /, / ,,; /, R-- jRe. It is obvious that the bridge will be balanced with the mustache: u1.ii, that KoiiT KTbi / and // are either both closed, or both of Zaz () Mkkuty. During a time loop, when one of the contacts is closed and the other is open, when the bridge is paired, a current pulse arises in the diagonal bridge, the amplitude of which depends on the voltage; nstochnik; . power, and polarity - from the sequence of action of the tested coacts.

The second node of the device is a cascade of memory, also a high power supply, in the form of a bridge B. This bridge, which contains diodes D1 and D and “reclosed” coherent capacitors Ci and Cz, serves to store the impulse issued by the bridge / 1, in one of the Co) -) Ci or C. donsators, in charge, IC1-1M () from the moment of a pulse.

Wiring capacitors C and C diodes D n D; according to the scheme of the bridge, 5th sprinter1-; it is the ncluti-numbered point that measures the size of the current state of the system, the current of the rest of the units.

The third zzel device p) is a measuring bridge B, which forms the first lamp / L // 3 and is made repetitively and Rs v. having a 15 diagonal switch magnetoelectricity with a key and a meter and a meter; a meter; VJ / 1 with a zero middle scale.

The work of the device proceeds in the following way.

Before measuring s.peduet times) to push capacitors C | nS-, lockG) for a short time by doubling the keypad KN. After the CI button is opened, the circuit is initially set to W – n: contacts / and //, for example, open, bridge A is equilibrium, if potentials at points a and b are equal, potentials at capacitors C and 0-2, and therefore , and on grids .champ // i and L2 are also equal;

the bridge B is also balanced, the potentials are at points in n g of the rampa, and the arrow of the MA instrument is small.

When one of the tested contacts, for example, contact ./, is closed, the resistance R- is unrocked, the equilibrium of bridge A is violated, the potential at point a increases, and capacitor C begins to charge through diode Yes and resistance. At the same time, the potential of the pa of the L-triode grid changes, which causes a)) unbalance.

Coidensato) C-, is charged before the contact contact closing mechanism //.

When the contact is closed, // bridge / 1 onova comes to equilibrium, and bridge B remains unresponsive, since 1 is the presence of a diode Before the obstacles} discharge voltage cv.

If the first // contact is closed, and then the contact /, then the process will proceed ana, it is logical, with the only difference that this will increase the npi note of Niial at point b, the capacitor C will charge through diode D and e, and R arrow device MA

DEFLT1-GTSYA in PROPERTIVE POSITION 1.

The operation of the device will be similar to iroil even if, with the contacts closed and / and //, it is necessary to measure, in;) the interfluence between the circuit: -; - |) ogogo ir druogogp 1 pitakto.

 I re dm s tn 3 obreet with P and

Claims (4)

1. A device for measuring the time interval between the moments of closing (or opening) of two contacts, consisting of count; resistance set connected according to the bridge circuit, memory cascade, contained, its “storage co-sources” and diodes and connected to the output diagonal of the indicated a bridge, and an electrical measuring instrument connected to the output of the memory cascade and showing the measured time interval, which is the time. This is due to the fact that, in order to determine the order of contact triggering, the latter are connected to the resistances of the adjacent arms of the bridge in such a way that when one of the contacts springs, a right-sized current pulse occurs at the output of the bridge, which stops the contact and the polarity of which is determined by the contact-response sequence, and as an electrical measuring instrument, an instrument is used which has right. Indicator deflection is determined by the polarity of the nmPulse current. 2. Devices by TI. 1. From the circuit, so that in the cascade of the pairs of capacitors E3 and the diodes are connected according to the bridge circuit to eliminate the measurement tolerance. arise nsy due to the presence of a current resting diodes. 3. The device according to claim 1. About tl and Cha is that the test contacts are connected in parallel to the part of the resistance of the corresponding KKch bridge of the bridge to prevent short circuit of the power supply. 4. The device according to claim 1 using a dial-up magnetoelectric milliammeter with a zero in the middle of the scale as an electrical measuring instrument, showing the first half of the time interval between the contact response times and the last; n, the efficiency of their operation.