SU1684746A1 - Device for testing of serviceability of relay protection - Google Patents

Description

one

(21) 4750159/21

(22) 16.U 89

(46) 15.10.91, Kyul. v 38

(71) Novosibirsk Electrotechnical

INSTITUTE

(72) L.I. Shalin, R.V. Ivanov and A.L.Shalin

(53) 621.31.925 (088.8)

(56) Copyright griddetelstlo USSR № 1032513, cl. G, 0 R 31/02, 1462.

(54) DEVICE LIA MONITORING ISPR / - RELAY PROTECTION

(57) The invention relates to the control - but - measuring devices. The purpose of the invention — PONPCHGNIR of control validity — is achieved by inserting an additional adder 4 and a switching element 5 into the device. At one of the inputs of each sum or ... 3, the switching element 5 is compensated for the compensating signal r on the auxiliary input mmchthor.h 4, which leads to a computation in the output signals of the input adders 1 ... 3 of the same components of the control ignals. As a result, the device can control such objects, the signal of the test points of which can and (change its own value for the normal duty of protection. The device contains a measurement unit 6, an element 7 counter, a diode bridge 8, a comparator 9., an element 10 time lag.

with Ј

WITH

The invention relates to instrumentation and is designed to monitor the health of components, blocks, modules, circuit boards and relay protection circuits made on active elements, the signals at control points of which, in standby mode, the internal protection is constant or equally variable. for example, in various. Phase devices zshchity. direct current voltage.

The purpose of the invention is to increase the reliability of the control by comparing by BTiif-niP other control signals of the same type of blocks, for example, i different Lazah protection.

In the drawing, a schematic diagram of the device is attached.

A device for monitoring the performance of a speech zag: yty seals the adders 1, 2, 3, the main inputs of which serve as inputs to the device, in an amount equal to the number of controlled plug-in modules. Input summars 1, 2, 3 are preassigned to sum the incoming signals to them.

The device also contains an additional adder A, designed to sum the signals arriving at it. The main inputs of the additional adder 4 are connected to the corresponding inputs from the socket. Output additional hc-mllgl 4 through

ABOUT

oo

4 j

O5

switching element 5 is connected to the combined compensating inputs of adders 1, 2, 3. Switching element 5 is designed to open and close the output signal circuit of additional adder 4.

The outputs of the adders 1, 2, 3, 4 are connected to the corresponding inputs of the measuring unit 6, which is intended to measure the incoming signals to it one by one.

The outputs of the control element 7, designed to monitor the operability of the proposed device, are connected to the test inputs of the corresponding adders 1, 2, 3, 4.

The outputs of the adders 1, 2, 3 are also connected to the inputs of the multi-shoulder diode 8, designed to separate the maximum and minimum of the incoming signals.

The outputs of the multi-shoulder diode bridge 8 are connected to the inputs of a dual-input comparator 9, which is designed to generate a single output signal when the input signals exceed the trigger threshold.

The output of the two-input comparator 9 is connected to the input of the time-delay element 10 for creating a time delay of the order of 10-15 seconds. The output of the element 10 time delay serves as the output device.

The adder 1 contains an amplifier 11 in a microcircuit design, the non-inverting input of which is connected to the common wire, and the inverting input through resistors 12 is connected to the main inputs of the adder 1, through the power supply stage 13 - to the compensating input of the adder 1, and through a resistor 14 - to the test input of the adder 1. Resistor 15 is designed to provide negative feedback, and resistors 16, 17 are for adjusting adder 1.

Adders 2, 3 are made similar to adder 1.

An additional adder 4 contains a microcircuit amplifier 18 in a non-inverting input of which is connected to the common wire, and inverting through resistors 19 is connected to the main inputs, and through the reactor 20 - to the test input of an additional adder 4, the resistor 21 is designed to provide a negative reverse connection, and the resistors 22, 23 - to adjust the additional adder 4.

The switching element 5 contains an electric button 24 with contacting contacts connected between the input and the output of the element 5.

Measurement unit 6 comprises electrical buttons 25 for selecting a signal to be measured. One output of each electric button 25 serves as an input to the unit 6, and the combined second outputs of the buttons 25 through a resistor 26 are connected to the combined first terminals of both contact groups of the dual switch 27. The dual switch 27 is designed to change the polarity of the voltage on the small-sized voltmeter 28 intended for measuring signal and connected between the switching contacts of both contact groups of the dual switch 27. The combined second terminals of both contact groups of the double switch 27 with dineny a common wire. The electric button 29, connected in parallel to the resistor 26, is intended to change the sensitivity range of the measurement unit 6.

Control element 7 contains electrical buttons 30 in an amount equal to the total number of adders 1, 2, 3, 4. One output of each button is connected to the power supply bus, and the other serves as an output of element 7.

Multi-shoulder diode bridge 8 is made according to the standard scheme and contains diodes 31, 32. The combined cathodes of diodes 31 and the anodes of diodes 32 serve as inputs to the multi-shoulder diode bridge 8. The combined anodes of diodes 31 serve as the first output, and the combined cathodes of diodes 32 are the second output of the multi-arm diode bridge eight.

The two-way comparator 9 contains dividers of resistors 33, 34 and 35, 36, connecting the inputs of the two-input comparator 9 with the non-inverting and inverting inputs of the amplifier 37 in a microchip design. A resistor 38 connected between the positive power supply bus and the non-inverting input of amplifier 37, and a resistor 39 connected between the minus power supply bus and the inverting input of amplifier 37 are designed to provide the necessary threshold for the comparator 9. A chain of ballast connected in series the resistor AO and the diode 41, is designed to shunt the positive polarity signal at the output of the amplifier 37 and pass only the negative polarity signal to the output of the two-input comparator 9. The LED 42, connected in series with the resistor 43 between the output of the two-input comparator 9 and the common wire, is intended to signal the operation of the two-input comparator 9.

Element Yu time delay is made according to the standard scheme. As element 10, any electromechanical or electronic time switch can be used with a response time of 10-15 seconds and instantaneous return. The output element Yu time delay serves as the output device.

The device is designed to monitor the health of a group of similar type of interchangeable protection modules located, for example, in different phases. Previously, the inputs of the adder 1 are connected to the control points of the first monitored module, the inputs of the adder 2 to the control points of the second module to so on. The inputs of the additional adder 4 are connected to the control points of all monitored security modules included in the group in question. The condition for the inclusion of replaceable protection modules into one controlled group is the approximate equality of the control signals of these modules in the duty mode of the proper protection. The control signals taken from the control points of these protection modules can vary significantly during operation, but in the duty protection mode, the signals at the same control points of different protection modules included in the controlled group should be approximately equal to each other.

The control points on the monitored replaceable protection modules are the outputs of the microcircuits, the outputs of the transistors, relays and other elements, the signals on which, in the duty mode of the operative protection, represent the DC voltage.

Before putting the device into operation, it must be configured. With

0

five

0

five

In this case, the protection and well-designed yoi roystpo must be given out strenuously from the power supply and, if possible, can more accurately simulate the signals that are mighty present in the controlled-mode modules powered by the mode: TWA. When setting up adders 1,. 3, press button 24 in 5 switching and thereby interrupt the signal circuit from additional adder 4 to the compensating inputs of adders 1, 2, 3. The potentiometer motors 13 in the adders should be in the upper position, i.e. The maximum resistance value is entered. After that, the button 25 in the measurement unit 6 is pressed, which corresponds to the adjustable adder 1, 2 or 3, and the readings of the voltmeter 28 are read. If the needle of the voltmeter 28 is pressed against the left stop, i.e. the reverse polarity is applied to it, the dual switch 27 is switched and the polarity of the signal supplied to the voltmeter 28 is changed. Then move the slider of the potentiometer 17 in the tunable adder, until the voltmeter 28 reads zero. After the presetting, press the button 29 in the measurement unit 6, thereby increasing the sensitivity of the voltmeter 28, and adjust it more precisely in the manner described above.

Then similarly adjust the remaining adders 2 and 3.

When setting up an additional adder 4, it should be borne in mind that its transfer coefficient must be less than that of adders 1, 2, 3. For example, when using three adders 1, 2 and 3 and equal to the unit of their transfer coefficient, the transfer coefficient of the additional adder 4 should be equal to 1/3. If five adders are used, then the transfer coefficient of the additional adder 4 should be 1/5 and so 0 Next. The required magnitude of the transmission coefficient of the additional adder 4 is provided by the appropriate choice of the resistance of the feedback resistor 21.

Additional adder 4 is configured by voltmeter 28 in the same way as adders 1, 2, 3.

After setting the additional adder 4 button 24 in the element 5

0

five

0

five

five

switching again closes. The protection mode is simulated again, but with different signals at the control points of the monitored protection modules. It is desirable that these signals be significantly different from those that occurred during the previous setup, but still correspond to the duty mode of the serviceable shields. In this case, it is possible to simulate, for example, changes in the load of the protected object, frequency and voltage in the power network, the deviation of the voltages coming from the power supply unit from their nominal values, and so on. Since all these changes equally affect the operation of all those security modules that are included in the controlled group, the imbalance that occurs on the input adders 1, 2, 3, 4 will also be the same. Since the button 24 in the switching element 5 is closed, the unbalance signal taken from the output of the additional adder 4 can compensate for the unbalance of the adder 1, 2, 3. For this, additional adjustment is made of the adders 1, 2, 3. The setting is similar to that described earlier the difference is that the button 24 is closed and the adjustment is made by resistors 13 included in the adders 1, 2, 3. The purpose of this adjustment is to ensure that with all possible changes of the control signals taken from the monitored modules th protection in its duty mode, the signals at the outputs of adders 1, 2, 3 remain close to zero.

The trigger threshold of the two-input comparator 9 is adjusted from those small unbalances that may occur at the outputs of the adders 1, 2, 3 in the process of operation due to inaccurate adjustments, misalignment-aging of elements, and so on. This is ensured by the appropriate choice of, for example, resistors 38, 39.

The operability of the proposed device can be checked by alternately pressing the button 30 in the element 7. When pressing each button, the corresponding adder is unbalanced, the two-input comparator 9 is triggered and the LED 42, which is included in it, turns on. After 10-15 seconds, a signal appears at the output of the time delay element 10, which is displayed on the control panel of the board PROTECTION FAIL.

After the described configuration and verification of the proposed device, together with controlled protection can be put into operation.

In the initial state — in the duty mode of good protection, due to the above-described setting, the signals at the outputs of the adders 1.2, 3 are set to zero, the two-input comparator 9 is in the failed state, and there is no signal at its output. There is no signal at the output of the element 10 time delay. LED 42 does not illuminate.

When damage occurs in controlled replacement protection modules, in which at least one pilot signal changes significantly, the corresponding adders are broken. The maximum unbalance signals of the adders 1, 2, 3 through the multi-arm diode bridge 8 are fed to the inputs of the two-input comparator 9. If these signals exceed the comparator threshold, the two-input comparator 9 is triggered and a single signal of negative polarity appears at its output which triggers element 1C delay. After 10-15 seconds at the output of element 10, a signal appears that arrives at the control panel and flashes the scoreboard. PROTECTION IS FAIL.

i When a control signal appears on the control panel PROTECT FAIL, it is checked whether the LED 42 is lit on the relay. If the LED 42 is illuminated, the two-input comparator 9 actually worked, then alternately, by pressing the button 25 in the measuring unit 6, according to the indications of the voltmeter 28, the output adder 1, 2, 3 is shown on the output side of the largest mismatch signal. The replaceable protection module corresponding to this adder is considered damaged. It is replaced with a working one, after which protection can be reintroduced into operation.

 Significant signals can appear at the outputs of adders 1, 2, 3 and with good protection.

for example, when short circuits are x on the protected object, near it or in other similar modes, i.e. in alarm mode. However, the proposed device is rebuilt from the alarm mode due to the time delay of the element 10. Therefore, a signal about the failure of protection in the alarm mode will not be issued.

Thus, the device is suitable not only for monitoring the health of such interchangeable protection modules, the signals at the control points of which are constant DC voltage, but can also monitor the health of such protection modules, all or part of the control signals of which They are DC voltages, the magnitude of which can vary considerably in the duty mode.

Claims (1)

Invention Formula A device for monitoring the health of relay protection, containing adders for the number of control objects, measurement unit, control element, comparator, exposure element, diode bridge with the number of arms according to the number of control objects, the inputs of the adders are connected to the corresponding inputs of the device, and the outputs are connected to the corresponding inputs of the measurement unit, the input element the time delays are connected to the comparator output, and the output is connected to the device output, the comparator inputs are connected to the corresponding outputs of the diode bridge, the inputs of which are connected to the corresponding outputs of the adders, characterized in that, in order to increase the reliability of the control, an additional 0 the adder, the switching element, the inputs of the additional adder are connected to the corresponding inputs of the device, and the output is connected to the corresponding input of the measuring unit 5 and through a switching element with compensating inputs of adders, the controlling inputs of which are connected to the corresponding outputs of the control element. Inputs / - Inputs 38 cKZH -0 + 36 34 KZ 0 | gp-gt to fault signal Inputs