RU1806410C - Position monitoring system for nuclear reactor control element - Google Patents

Abstract

Field of application: nuclear energy, in particular, devices for monitoring the position of the regulator. The essence of the invention: the first is introduced into the position control system of the nuclear reactor regulator - Ne sample storage device, maximum and minimum voltage isolation units, first and third resistors, and the second terminal of the supply voltage is connected to terminal N through the first resistor th sensor coils, outputs of the bc windings of the first - N-ro isolation transformers are connected to the inputs of the first - N-ro of the sampling-storage devices, whose gate inputs are combined and connected to the output to a device, the input of which is connected to the first and second terminals of the first resistor, the first one is N-ro sampling-storage devices, the outputs of which are connected to the first and Nth inputs of the maximum isolation unit and the minimum voltage isolation unit, as well as the first inputs, respectively the first one is N-ro voltage comparison blocks, the output of the maximum voltage isolation block through the second resistor is connected to the second inputs of the first N-ro voltage comparison blocks, and through the third resistor is connected to the output of the voltage block and minimum voltage, while the sampling-storage device is made in the form of a comparator, at the output of which an anode is connected to a diode, the cathode of which is the output of the sampling-storage device and connected to the first terminals of the capacitor and resistor and the inverting input of the comparator, the non-inverting input of which is the input of the sample-storage device, the second terminals of the capacitor and resistor are connected to a common bus, the gate input of the comparator is the gate input of the sample-storage device. 1 C.p. f-ls, 3 ill. y fe 00 oh

Description

with

The invention relates to the field of nuclear energy, and in particular to systems for controlling the position of a regulatory body.

The purpose of the invention is to increase the reliability of the control of the position of the regulator by using in the system

only more temperature-stable inductive component voltages from the coils and comparing them with a continuously monitored reference voltage.

In FIG. 1 is a structural diagram of a system for monitoring the position of a regulatory body; in FIG. 2 - the principle of isolation of the inductively constituent voltage of the sample storage device; in FIG. 3 is a timing diagram of the operation of the ontrol system of the position of the regulator. The control system of the position of the regulator contains (see Fig. 1) a linear sensor 1 with inductive coils 1.1-1.p, regulator 2, magnetically a shunt 3, rigidly connected to the regulator, isolation transformers 4.1-4.P , sampling and storage devices 5.1-5.P, comparator 6 of the strobe pulses, blocks 7 and 8, respectively, of the maximum and minimum voltages, comparison blocks 9.1-9.P, signal processing unit position 10, resistor 11 in a series-connected chain of sensor coils resistors 12 and 13 in series but connected circuit blocks 7 and 8 outputs.

The position sensor 1 consists of n single winding coils 1.1-1. P located along the path of the shunt 3 and the regulator 2. One of the free ends connected in series to the coils is connected to the first terminal 14, the other (the output of the first coil) through a resistor 11 is connected to terminal 15 of the supply

for example Coils 1.1-1.P are connected to the primary windings of the corresponding isolation transformers 4.1-4.P, designed to bring different potential voltages from the coils when connected in series to the same potential. The secondary windings of isolation transformers 4.1-4.P are connected to the inputs of the corresponding devices in the storage-storage 5.1-B.p. The voltage from the resistor 11 is fed to the input of the comparator b, the output of which is connected to the gating inputs of the 5.1-bp sampling-storage devices. The output of each sample-storage device is connected to the first inputs of the corresponding comparison blocks 9.1-9. P, as well as to the inputs of the maximum isolation unit 7 (the coil is closed by the Uciu shunt) and the minimum isolation unit 8 (the coil is not closed by the Ksh shunt) voltage. The outputs of blocks 7 and 8 through the resistors 12 and 13 are combined and form the required value of the monitored reference voltage (Common Uon Ucm) at the connection point of the resistances. The reference voltage is supplied to the second inputs of the comparison blocks 9.1-9.p, where it is compared with the voltage from the outputs of the sampling-storage devices 5.1-5.P. The outputs of the comparison blocks 9.1-E.p are connected respectively to

the inputs of the position signal processing unit 10.

The position control system operates as follows.

Let in the initial position by shunt 3 the magnetic circuit of only coil 1.1 is closed. Voltage 11o (see Fig. 2,3), taken from any of the coils 1.1 - 1, p and supplied through isolation transformers 4.1

0 - 4.p to the inputs of the sampling and storage devices 5.1-bp, consists of two components of active Ur, which coincides in phase with the current through the coil I.Ln of the sensor and inductive UL, which outpaces the current by

5 quarter period. The input voltage of the comparator 6 is supplied with a resistor 11. The strobe pulses generated by the comparator 6 coincide in phase with the current and, therefore, with the active component Ur of the total voltage Uo of the coils. The strobe pulses lock the sampling and storage devices 5.1-5. П for the duration of the positive half-wave of the active component from the time moment when the active component Ur 2: 0. By this time, the voltage Uo on the coil will have time to increase only to a value equal to the maximum value of the inductive component UL.

0, when the temperature of the sensor coils changes, their active resistance changes, and therefore, the active component Ur. However, due to the fact that the strobe pulses lock the sampling and storage devices during the time of operation of the positive half-wave

active component, weekend at. sampling and storage device

5.1-5.P will remain unchanged and equal.

maximum values of inductive components of UL voltage, coils 1.1-1.

With the same current flowing through the coils 1.1-1.P, the voltage on the coil 1.1 is greater (the coil is closed with a shunt of 5 volts) than with the unclosed shunt coils of 1.2-1.p; The voltage at the storage capacitor 17 of the sampling-storage device 5.1 will have time to rise to the moment of the occurrence of the blocking strobe

0 greater value (Us.i Uciu) than the voltage across the capacitors 17 of the 5.1-bp sampling and storage devices (Us, 2-5.n Yes). The capacitor 17 and the resistor 18 in the sample storage devices are selected so that

5, a minimum discharge period of the capacitor was provided at the required system speed. When the next positive half-wave voltage arrives, the capacitor recharges to the value of the maximum inductive component of the voltage. The voltages from the outputs of the retrieval-storage devices are supplied to the maximum voltage isolation unit 7 and the minimum voltage isolation unit 8. At the input of block 7, there will be a voltage Umax U5.1 Ps, and at the output of block 8, the selection of the minimum voltage, Umin Us.2.-5.n is, from the common point of the connection of resistors 12 and 13, the reference voltage (Kssh Uon U6ui) it is fed to the inputs of the comparison blocks 9.1-Э.п, where it is compared with the voltages from the outputs of the sampling-storage devices 5.1-5. П, At the output of the comparison block 9.1, the voltage will be equal to the level of a logical unit, since Us.1 is 11 usd Uon. and at the outputs of the remaining blocks of comparison 9.2 - 9.p - the level of logical zero, since Us.2-5.n Uon. With further movement of the control 2, shunt 3 closes the magnetic circuit of coil 1.2. The voltage at the output of the retrieval-storage device 5.2 will become greater than the reference voltage, while the voltage at the output of the comparison unit 9., 2 will become equal to the level of a logical unit, When 3 coils 1.3-1 are sequentially closed by a shunt 3, P at the outputs of the comparison units 9.3-9. P will also sequentially display the voltages of the logical unit. These changes in the state of the outputs of the comparison units after the position signal processing unit 10 has converted the position are displayed on the operator display indicating the location of the regulator.

Thus, in transient modes of operation of a nuclear reactor, when the temperature of the sensor coils changes, there will be no possible disruption to the control system of the position of the nuclear reactor regulator. In addition, the manufacturing technology of the sensor is simplified by aligning the resistance of the sensor coils.

Claims (2)

SUMMARY OF THE INVENTION 1. A control system for controlling the position of a nuclear reactor control element, comprising a linear position sensor with a first — Nth induction coil, a magnetic shunt magnetically rigidly connected to the regulator, the first — Nth isolation transformers, first — Nth blocks voltage comparison, a comparator and a position signal processing unit, the first - Nth inputs of which are connected to the outputs of the first - N-ro voltage comparison units, the first - N-inductive coils are connected in series, the output of the Nth coil is connected to the first to the supply voltage terminal, the first N-coils are connected to the primary windings, respectively, of the first N-ro isolation transformers, respectively, in order to increase the reliability of monitoring the position control system of the regulator, the first - Ne sampling devices are introduced into it -storage, maximum and minimum voltage isolation units, first to third resistors, the second terminal of the supply voltage through the first resistor connected to the output of the Nth sensor coil, the terminals of the secondary windings of the first - N-ro isolation x transformers are connected to the inputs of the first, N-ro, sample-storage devices, the gate inputs of which are combined and connected to the output of a comparator, the input of which is connected to the first and second terminals of the first resistor, the first, N-ro, of sample-storage devices, outputs which are connected respectively to the first - N-th inputs of the maximum isolation unit and the minimum voltage isolation unit, as well as to the first inputs of the first - N-ro voltage comparison units, the output of the maximum direct voltage via a second resistor connected to the second inputs of the first - N-ro blocks and comparing the voltages across the third resistor connected to the output isolation block minimum voltage. 2. The system according to claim 1, characterized in that each sample-storage device is made in the form of a comparator based on an operational amplifier, the output of which is an anode connected to a diode, the cathode of which is the output of the sample-storage device and connected to the first terminals of the capacitor and a resistor and an inverting input of a comparator, the non-inverting input of which is an input of a sampling-storage device, the second inputs of a capacitor and a resistor are connected to a common bus, the gating input of a comparator is a gating input of a device sampling-storage Twa. Uot S i L  / U Rt Fig, / Uot y-7vx l & FIG. 2 Fig 3