CN104332194A - New grouping method for control-rod position detector coils - Google Patents

Abstract

The invention belongs to grouping methods for pressurized-water-reactor nuclear power station control-rod position coils, and concretely relates to a grouping method for pressurized-water-reactor nuclear power station control-rod position detector coils. The grouping method comprises the following steps: dividing 16 coils of an A group according to the odd and even sequence into an A1 subgroup and an A2 subgroup and enable each subgroup to have 8 coils; then performing positive wiring and negative wiring on the coils of each subgroup according to the odd and even sequence; designing an independent rod-position measure channel of each subgroup, processing an induction voltage signal of the subgroup and generating a rod-position measure signal of the subgroup; and then combining processed signals A1 subgroup and A2 subgroup, so as to obtain a code same to an original A code. The method comprises the advantages that the sensitivity of measure precision and measure results on thresholds is reduced, the shaping threshold regulating work for rod-position measure channels is greatly simplified, the debugging and test periods for the rod-position measure channels are shortened, and phenomena such as flash and jump of rod-position display are avoided.

Description

A kind of new control rod stick location probe coil group technology

Technical field

The invention belongs to a kind of pressurized water reactor nuclear power station control bar rod bit line circle group technology, be specifically related to a kind of group technology of pressurized water reactor nuclear power station control bar stick location probe coil.

Background technology

RCC assembly (RCCA) is arranged in primary Ioops high temperature and high pressure environment, generally utilizes the principle of electromagnetic induction to carry out to the measurement of its position.

At present, the stick location probe of domestic PWR nuclear power plant mainly comprises the parts such as primary coil (also referred to as primary coil), measuring coil, ancillary coil three kinds of coils and coil rack, capsul and outer tube.Primary coil is a long solenoid, along whole stroke coiling.Measuring coil and ancillary coil are all secondary coils, coaxial with primary coil.Primary coil is for generation of alternating magnetic field; Multiple measuring coil is used for the position of Survey control rod in reactor core, and grouping forms excellent position Signal coding; Ancillary coil is used for primary current and regulates.

In order to roughly determine the position of control rod, the measuring coil of sufficient amount must be set.The number of measuring coil and spacing according to the length of driving shaft stroke and will wish that the resolution reached is determined.In order to reduce the quantity of wiring between detector and signal processing channel, reducing the quantity of signal handling equipment, also must divide into groups to measuring coil.

The each mechanical step-length degree of control rod driving shaft of current domestic most pressurized-water reactor nuclear power plant is 15.875mm, and total travel is 228 steps.Detector resolution is 8 steps (127mm), measuring coil 31, is divided into A, B, C, D, E five groups, and whole measurement stroke is 256 machinery steps.

Each group of coil is numbered:

E group (first group) coil 16

D group (second group) coil 824

C group (the 3rd group) coil 4122028

B group (the 4th group) coil 26101418222630

A group (the 5th group) coil 135791113151719212325272931

Therefore A group measuring coil quantity is maximum, and be 16, coil-span is 16 steps, and B group coil-span is 32 steps, and C group coil-span is 64 steps, and the spacing of D group coil is 128 steps, therefore A group coil having the greatest impact to measuring stick position.

Test and nuclear power scene actual moving process in, the rod position measurement waveform of A, B, C and D group induced voltage is illustrated in fig. 1 shown below.As can be seen from Figure 1:

The waveform comparison of B, C and D group is desirable, and high-low voltage is equidistantly staggered to be occurred, transient process is clear, and without flex point, waveform gradient greatly, voltage acute variation stroke is short, and therefore rod position measurement passage is easy to carry out shaping to it and process is converted to digital signal.

The wave form distortion of A group is serious, there is calabash shaped waveform, its 0 voltage stroke is very short, most cucurbit parcel voltage is more than 50%V, knee voltage is also close to 50%V, therefore waveform threshold voltage adjust very difficult: if threshold voltage is less than knee voltage or higher than cucurbit parcel voltage, 0 stroke and 1 stroke length will be made to differ greatly, affect measuring accuracy; If threshold voltage fixes between knee voltage and cucurbit parcel voltage, the phenomenon of the flicker of measuring stick position will occur during cluster motion, jumping.

A group wave shaping threshold voltage is difficult to regulate, and makes scene carry out the debugging of control rod rod position measurement passage and test is wasted time and energy very much, and the cycle is longer, and the flicker easily causing measuring stick position to show and jump, affects the control of reactor operator to reactor.

Summary of the invention

The object of this invention is to provide a kind of the present invention when not changing stick location probe physical construction and electric parameter, carry out again dividing into groups by stick location probe A group measuring coil, signal transacting and synthesis, produce measuring stick position, thus solve that former stick location probe A group winding waveform is difficult to adjust, excellent position display easily flicker, jump, debug and the shortcoming such as the test period is longer.

The present invention is achieved in that a kind of new control rod stick location probe coil group technology, and it comprises the following steps:

(1) in all immovable situation of electric parameter of layout in detector of the quantity of the kind of former stick location probe physical construction, coil, coil, coil and measuring coil, 16 coils of A group are split again, former A group coil is divided into A1, A2 two subgroups by odd, even order, each subgroup 8 coils, concrete packet mode is:

A1 subgroup coil 1,5,9,13,17,21,25,29

A2 subgroup coil 3,7,11,15,19,23,27,31

(2) coil of each subgroup just connect successively according to odd, even order again, reverse wiring, namely A1 subgroup 1,9,17,25 just connects, 5,13,21,29 reversal connections; A2 subgroup 3,11,19,27 just connects, 7,15,23,31 reversal connections;

(3) each subgroup designs separately independently rod position measurement passage, processes the induced voltage signal of this subgroup, produces the measuring stick position signal of this subgroup;

(4) again A1, A2 two subgroups are synthesized by signal after process, obtain the coding identical with former A code;

(5) to encode with other measuring stick position of formation control rod together with B, C, D, E.

Advantage of the present invention is, when not changing the structure, electric parameter, coil layout etc. of former stick location probe, by means of only being 2 subgroups to the A group coil Further Division of original measuring coil, then its measuring-signal is processed respectively, last mode of synthesizing former A coded signal again, improve rod position measurement precision, reduction measuring accuracy and measurement result are to the susceptibility of threshold value, greatly simplify the adjustment work of rod position measurement passage shaping threshold value, shorten debugging and the test period of rod position measurement passage, avoid the flashing of display bar position, jump phenomena.New rod position measurement coil group technology, do not change the physical construction of former stick location probe, the kind of coil, the quantity of coil, the layout of coil in detector and the electric parameter etc. of measuring coil, only need the rewiring of A group coil, other grouping is constant, therefore scheme is simple, easily implements.New rod position measurement coil group technology, the A group measuring coil of former stick location probe is divided into two subgroups by odd even order, the coil of each subgroup just connects successively according to odd, even order again, reversal connection, and adopt independently rod position measurement passage to process the signal of each subgroup coil respectively, finally at the excellent position signal of the former A code of synthesis, produce the measuring stick position of every root control rod.The defects such as new rod position measurement coil group technology overcomes former stick location probe Measurement channel waveform threshold value and is difficult to adjust, and the display of excellent position glimmer, beat, shorten and affect and the debugging of maintainer and the cycle of test, improve economy and the security of nuclear power plant.

Accompanying drawing explanation

Fig. 1 is the excellent digit wave form figure of A, B, C and D code;

Fig. 2 is former stick location probe structure and grouping schematic diagram;

Fig. 3 is structure and the grouping schematic diagram of new stick location probe coil grouping.

Embodiment

Below in conjunction with drawings and Examples, the present invention is described in detail:

A new control rod stick location probe coil group technology, it comprises the following steps:

(1) in all immovable situation of electric parameter of layout in detector of the quantity of the kind of former stick location probe physical construction, coil, coil, coil and measuring coil, 16 coils of A group are split again, former A group coil is divided into A1, A2 two subgroups by odd, even order, each subgroup 8 coils.Concrete packet mode is:

A1 subgroup (the 5th group) coil 1,5,9,13,17,21,25,29

A2 subgroup (the 6th group) coil 3,7,11,15,19,23,27,31

Certainly, the title of two subgroups also can be exchanged.

(2) coil of each subgroup just connect successively according to odd, even order again, reverse wiring, namely A1 subgroup 1,9,17,25 just connects, 5,13,21,29 reversal connections; A2 subgroup 3,11,19,27 just connects, 7,15,23,31 reversal connections.

(3) each subgroup designs separately independently rod position measurement passage, processes the induced voltage signal of this subgroup, produces the measuring stick position signal of this subgroup.

According to the method described above A group coil is divided into groups, make the spacing of two coils of each subgroup inside become 32 steps by 16 steps of original A group, namely identical with the spacing of B group coil.Like this, the measuring stick position signal of the Measurement channel process of each subgroup is identical with the signal of B group, its induction voltage waveform just has the similar feature of B group coil, high-low voltage is equidistantly staggered to be occurred, transient process is clear, without flex point, waveform gradient is large, voltage acute variation stroke is short, and therefore rod position measurement passage is easy to carry out shaping to it and process is converted to digital signal.

(4) again A1, A2 two subgroups are synthesized by signal after process, obtain the coding identical with former A code.

(5) last, the measuring stick position of formation control rod together with other encode B, C, D, E.

Through above-mentioned process, just by adopting the measuring stick position signal of 6 new codings, being reduced into 5 original codings, producing the measuring stick position of control rod.

And any change is not made to other group such as B, C, D and E group, affect minimum.

The structure of former stick location probe and grouping schematic diagram are as Fig. 2:

In the structure and grouping of former stick location probe, 16 coils of A group are by positive and negative series winding, export A group excellent position signal, A group signal waveform is difficult to adjust, debugging and the test period longer, there is flicker, jumping phenomena in the display of rod position, disturbs the control of reactor operator to reactor, have impact on economy and the security of nuclear power plant.

The structure of new stick location probe coil grouping and grouping schematic diagram be as shown in Figure 3:

In the present invention, B, C, D and E group is constant, only A group coil is divided into two subgroups by odd, even order further, the coil of each subgroup is again by odd, even order positive and negative serial connection successively, produce two signals, again by two independently rod position measurement passage carry out adjusting and process of signal, finally again by two signal syntheses A group signals.Instant invention overcomes former stick location probe Problems existing.

Claims (1)

1. a new control rod stick location probe coil group technology, is characterized in that: it comprises the following steps:

(1) in all immovable situation of electric parameter of layout in detector of the quantity of the kind of former stick location probe physical construction, coil, coil, coil and measuring coil, 16 coils of A group are split again, former A group coil is divided into A1, A2 two subgroups by odd, even order, each subgroup 8 coils, concrete packet mode is:

A1 subgroup (the 5th group) coil 1,5,9,13,17,21,25,29

A2 subgroup (the 6th group) coil 3,7,11,15,19,23,27,31

(2) coil of each subgroup just connect successively according to odd, even order again, reverse wiring, namely A1 subgroup 1,9,17,25 just connects, 5,13,21,29 reversal connections; A2 subgroup 3,11,19,27 just connects, 7,15,23,31 reversal connections;

(3) each subgroup designs separately independently rod position measurement passage, processes the induced voltage signal of this subgroup, produces the measuring stick position signal of this subgroup;

(4) again A1, A2 two subgroups are synthesized by signal after process, obtain the coding identical with former A code;

(5) to encode with other measuring stick position of formation control rod together with B, C, D, E.