CN208092160U - A kind of starting spare transformer open phase detection system based on optical ct - Google Patents

Abstract

The starting spare transformer open phase detection system based on optical ct that the utility model discloses a kind of, including optical ct and phase interruption testing device.The phase interruption testing device of the utility model accesses optical ct current signal, it calculates in real time and starts spare transformer high-pressure side three-phase current fundamental voltage amplitude, when any phase current is less than its no-load current, then it is judged to that open phase fault occurs, alarm signal is provided through delay and notifies operating personnel's timely processing, improves the operational reliability that power plant starts standby power system.

Description

A kind of starting spare transformer open phase detection system based on optical ct

Technical field

The utility model is related to the monitoring for protection fields that power plant starts spare transformer system, relate more specifically to generate electricity Factory starts the detecting system of spare transformer system open phase fault.

Background technology

World nuclear runs Experience Feedback (SOER 2015-1Safety of the NAB National Association 0f Broadcasters (WANO) in 2015 Challenges from Open Phase Events) in refer to the disconnection faults of several nuclear power stations emphatically, and thus lead The serious consequence of cause, it is desirable to cause to pay attention in the industry, make corresponding safe precaution measure.

Such as on January 30th, 2012, No. 2 units of human relations nuclear power station were visitd due on the porcelain insulating casing of 345kV switchyards by the U.S. Lead is fallen, and causes to start the on high-tension side high resistance earthing fault of spare transformer, this failure causes two and starts spare change Depressor C phase single-phase wire breaks.C phase decompressions cause starting spare transformer to produce unbalance voltage, and reactor protection system is correct The imbalance for having differentiated 6.9kV busbar voltages, reactor shutdown.It also results in by the several of starting spare transformer SAT power supplies Platform large-size machine is tripped due to phase current overcurrent, including essential service water pump, component cooling pump etc..8 points are about crossed Clock, the abnormal instruction of voltage and on the spot report find that No. 2 starting spare transformers are smoldered, and master control room operator disconnects manually The lead-in circuit breaker of the 4kV safety level busbares of dynamic spare transformer institute band, and then Emergency diesel is made to be supplied to 4kV safety level busbares Electricity.The equipment fault that the event exposes switchyard causes disconnected phase, protection and automatic device not to be alarmed accordingly, not quilt in time Operations staff has found, causes reactor shutdown occur and starts the accident of spare transformer damage.

There is also such as Bruce A1 units, No. 3 units of Forsmark, No. 2 units of Vandellos are several in the past The open phase fault that severity differs all occurred between year, has caused a series of event, has seriously threatened the safety of nuclear power station Operation.

Up to now, it yet there are no the open report for starting spare transformer high-pressure side open phase detection system Related product.For This, the utility model proposes a kind of the starting spare transformer open phase detection system based on optical ct, Sensitive Detection idle condition The on high-tension side open phase fault of lower starting spare transformer reminds operations staff's timely processing.

Utility model content

The purpose of this utility model is：To solve the spare change of starting to power plant zero load proposed in above application practice The demand of depressor open phase fault Sensitive Detection devises a kind of starting spare transformer open phase detection system based on optical ct.

The technical solution of the utility model is：

A kind of starting spare transformer open phase detection system based on optical ct includes phase interruption testing device and is installed on Play the standby on high-tension side optical ct of change；Wherein phase interruption testing device access optical ct current signal and breaker aided location；It is described Phase interruption testing device includes analog acquisition unit AC_I, digital signal processing unit DSP, it is mono- into collecting unit BI, MON to open Member, signal relay；

Optical ct acquisition starts spare transformer high-pressure side three-phase current, and current signal enters phase interruption testing device analog quantity Collecting unit AC_I is then output to digital signal processing unit DSP；

Opening into collecting unit BI for intake signal access phase interruption testing device, is then output to digital signal processing unit DSP；

Digital signal processing unit DSP is connected by internal bus with AC_I and BI units；

MON units are connected by internal bus with DSP unit and signal relay.

Further, the MON units by internal bus and LCD MODULE and debugging module, communication module, beat Impression block, clock synchronization module are connected.

The beneficial effects of the utility model：It is to be detected by the way that optical ct is applied to starting spare transformer open phase fault, Monitoring starts each phase current in spare transformer high-pressure side in real time, can differentiate the starting spare transformer in the case of no-load current is smaller Open phase fault solves the difficulty that can not be reacted under idle condition and start spare transformer open phase fault.

Description of the drawings

Fig. 1 is a kind of starting spare transformer open phase detection system construction drawing based on optical ct.

Specific implementation mode

A kind of starting spare transformer open phase detection system based on optical ct, including phase interruption testing device and be installed on The on high-tension side optical ct of dynamic spare transformer.Wherein optical ct parameter need according to start spare transformer rated voltage, Electric current, in-site installation condition, starts spare transformer no-load current to determine at environment temperature.

The utility model starts spare transformer high-pressure side three-phase current amplitude by the application of optical ct, in real time monitoring, It can differentiate the starting spare transformer open phase fault in the case of smaller no-load current, starting can not be reacted by solving under idle condition The problem of spare transformer open phase fault.

Below in conjunction with attached drawing, the utility model is described in further detail：

As shown in Figure 1, a kind of starting spare transformer open phase detection system based on optical ct, including phase interruption testing device The on high-tension side optical ct of spare transformer is started with being installed on.Wherein phase interruption testing device access optical ct current signal and open circuit Device aided location when any phase current is less than its no-load current under grid-connected state, then is judged to that open phase fault occurs, through prolonging When provide alarm signal.

The parameter of optical ct is needed according to the rated voltage of starting spare transformer, electric current, environment temperature, in-site installation item Part starts spare transformer no-load current to determine.According to the statistics to multiple scenes, standby change high-pressure side no-load current range is played In 0.2~0.5A ranges, then optical ct will ensure accurately measure in the range, could meet started under idle condition it is spare The needs of transformer open phase detection.In order to provide the separate equal signals of open phase fault, the generally installation 3 of spare transformer high-pressure side is started Group optical ct, detects A, B, C three-phase current respectively.

Phase interruption testing device operation principle is as follows：

Optical ct acquisition starts spare transformer high-pressure side three-phase current, and current signal enters phase interruption testing device analog quantity Collecting unit AC_I is exported after shaping filter is handled and is given digital signal processing unit DSP；

Intake signal access phase interruption testing device is opened into collecting unit BI, and output is to number after light-coupled isolation is handled Word signal processing unit DSP；

Digital signal processing unit DSP receives AC_I and BI element output signals by internal bus, carries out Fourier's meter Calculation and logic judgment calculate and start spare transformer high-pressure side three-phase current amplitude, and provide circuit breaker position；

MON units receive the starting spare transformer three-phase current amplitude and open circuit that DSP unit provides by internal bus Device aided location carries out logic decision；If meeting the phase decision condition of breaking, through the output contact that is delayed to signal relay and same When light open-phase indicting lamp.

MON units connect LCD MODULE by internal bus, for showing starting on phase interruption testing device liquid crystal Each phase current in spare transformer high-pressure side and other real-time status；

MON units are also connected with debugging module, the debugging for starting spare transformer open phase detection system；

MON units are also connected with communication module, print module, clock synchronization module, provide printing, clock synchronization and Communications service.

Claims (2)

1. a kind of starting spare transformer open phase detection system based on optical ct, it is characterised in that：It include open phase detection dress Set and be installed on the standby on high-tension side optical ct of change；Wherein phase interruption testing device access optical ct current signal and breaker auxiliary Position；The phase interruption testing device includes analog acquisition unit AC_I, digital signal processing unit DSP, opens into collecting unit BI, MON unit, signal relay；

Optical ct acquisition starts spare transformer high-pressure side three-phase current, and current signal enters phase interruption testing device analog acquisition Unit AC_I is then output to digital signal processing unit DSP；

Opening into collecting unit BI for intake signal access phase interruption testing device, is then output to digital signal processing unit DSP；

Digital signal processing unit DSP is connected by internal bus with AC_I and BI units；

MON units are connected by internal bus with DSP unit and signal relay.

2. a kind of starting spare transformer open phase detection system based on optical ct as described in claim 1, it is characterised in that： The MON units pass through internal bus and LCD MODULE and debugging module, communication module, print module, clock synchronization module phase Even.