CN105810509A

CN105810509A - Delay relay

Info

Publication number: CN105810509A
Application number: CN201610292967.0A
Authority: CN
Inventors: 夏冰
Original assignee: JINTAN POWER SUPPLY Co OF JIANGSU ELECTRIC POWER Co; State Grid Corp of China SGCC; State Grid Jiangsu Electric Power Co Ltd; Changzhou Power Supply Co of Jiangsu Electric Power Co
Current assignee: JINTAN POWER SUPPLY Co OF JIANGSU ELECTRIC POWER Co; State Grid Corp of China SGCC; State Grid Jiangsu Electric Power Co Ltd; Changzhou Power Supply Co of Jiangsu Electric Power Co
Priority date: 2010-09-29
Filing date: 2010-09-29
Publication date: 2016-07-27
Anticipated expiration: 2030-09-29
Also published as: CN105810509B; CN102005719A; CN102005719B

Abstract

The invention relates to a delay relay comprising a voltage sampling circuit connected with a three-phase power supply, an operation comparator detection circuit connected with the voltage sampling circuit and used for comparing a sampling voltage with a preset reference voltage to judge that whether the detected three-phase power supply is undervoltage or in a phase failure, an undervoltage output circuit connected with the operation comparator detection circuit and used for outputting an instantaneous action signal for remote signaling when detecting the undervoltage failure, and a timing controller connected with a timing trigger signal output end of the undervoltage output circuit and used for outputting a delay action signal for remote signaling after the undervoltage time of the undervoltage failure reaches a set delay. The relay provided by the invention can replace complete functions implemented by the combination of five relays in the prior art, the screen position space in a control cabinet is saved, the wiring in installation is simplified, the material and energy losses are reduced, and the economical development mode which is green, environment-friendly and low-carbon is embodied.

Description

Time-delay relay

Technical field

The present invention relates to the technical field of the three-phase alternating voltage supervising device in transformer station or power plant, specifically a kind of three-phase is under-voltage, phase shortage time-delay relay.

Background technology

At present; the three-phase alternating voltage put into operation at each node of electrical network is all monitored by many transformer stations, power plant; what employ up to is the phase shortage to PT voltage and under-voltage detects on the spot; then match with all kinds of protective relaying devices, the precision of the safety of power generation, electric-power metering is provided sound assurance.

Presently used three-phase alternating voltage measure loop is generally made up of five relays: A, B, C phase voltage is detected by three low-voltage relays respectively, and a time relay carries out time delay, an auxiliary reclay output signal contact.

When shield in cabinet have multi-segment voltage bus time, it is often necessary to tens relays are installed in a switch board, not only consumptive material, power consumption, and in cabinet, element is numerous and diverse, and cabling is chaotic, debugging, maintenance difficulty.

Summary of the invention

The technical problem to be solved in the present invention is to provide that a kind of three-phase is under-voltage, phase shortage time-delay relay, with the repertoire realized after substituting five relay assemblies of prior art, not only save screen bit space in switch board, and simplify installation wiring, reduce material, energy loss, embody the Economic Development Mode of green, environmental protection, low-carbon (LC).

In order to solve above-mentioned technical problem, the invention provides a kind of time-delay relay, including: the voltage sample circuit being connected with three phase mains, be connected with voltage sample circuit for comparing sampled voltage and preset reference voltage, to determine, whether tested three phase mains under-voltage or the computing comparator testing circuit of phase shortage, the under-voltage output circuit for exporting remote signalling snap action signal when recording under-voltage fault being connected with computing comparator testing circuit, the timing controller for exporting remote signalling deferred action signal after the under-voltage time of described under-voltage fault reaches the time delay set that signal output part is connected is triggered with the timing of under-voltage output circuit.

Further, described under-voltage output circuit is connected to the three-phase fault display lamp for indicating described under-voltage fault.

Further, this time-delay relay also includes: accessory power supply, the DC/DC changer being connected with this accessory power supply, the reference voltage circuit that is connected with DC/DC changer；The reference voltage output end of this reference voltage circuit is connected with the reference voltage input of described computing comparator testing circuit.

Further, the panel of described time-delay relay is provided with the three-phase operation display lamp of the running status indicating described three phase mains.

Further, described timing controller includes: enumerator that 0.1S time-base generator, outfan with this 0.1S time-base generator are connected and by the deferred action signal relay of this counter controls；The timing of under-voltage output circuit triggers signal output part and is connected with the triggering signal input part of 0.1S time-base generator, the contact of deferred action signal relay is connected with deferred action signal contact, and the snap action signal output part of described under-voltage output circuit is connected with snap action signal contact.

The technique scheme of the present invention has the advantage that the time-delay relay of (1) present invention utilizes direct current back work power supply compared to existing technology, is transformed to relay working power through DC/DC, and provides precision voltage reference；A, B, C three-phase alternating voltage needing monitoring is sampled by relay, indicate its running status at panel simultaneously, after the three-phase alternating voltage that sampling comes is compared by computing comparator testing circuit respectively with preset reference voltage, determine whether detected voltage under-voltage or phase shortage, after timer internal time delay, export indicating fault at relay panel, be simultaneously emitted by contact point signal and do remote signalling.(2) present invention adopts the key technology such as Width funtion Micro Energy Lose switch power technology, Micro Energy Lose semiconductor integrated circuit technology, it is suitable for the straight-flow system that voltage is 110V or 220V simultaneously, it both can be directly applied to newly-built electric substation, it is also possible to is applied in old electric substation transformation project.

Accompanying drawing explanation

In order to make present disclosure be more likely to be clearly understood, below according to specific embodiment and in conjunction with accompanying drawing, the present invention is further detailed explanation, wherein:

Fig. 1 is the circuit structure block diagram of the time-delay relay in embodiment；

Fig. 2 is the schematic diagram of the panel of described time-delay relay；

Fig. 3 is the binding post schematic diagram of described time-delay relay, and wherein Uf is the terminals of accessory power supply；

Fig. 4 is the electrical schematic diagram of described time-delay relay；Wherein, a1--is that A phase voltage runs instruction；A2--A phase voltage indicating fault；U1, U2, U3, U4--computing comparator；U5--0.1S time-base generator；U6--enumerator；J1--snap action signal relay；J2--deferred action signal relay；8--snap action signal contact；9--deferred action signal contact.

Fig. 5 is the function logic schematic diagram of described time-delay relay.

Detailed description of the invention

See Fig. 1-5, the time-delay relay of the present embodiment includes: the voltage sample circuit being connected with three phase mains, be connected with voltage sample circuit for comparing sampled voltage and preset reference voltage, to determine, whether tested three phase mains under-voltage or the computing comparator testing circuit of phase shortage, the under-voltage output circuit for exporting remote signalling snap action signal when recording under-voltage fault being connected with computing comparator testing circuit, the timing controller for exporting remote signalling deferred action signal after the under-voltage time of described under-voltage fault reaches the time delay set that signal output part is connected is triggered with the timing of under-voltage output circuit.

Described under-voltage output circuit is connected to the three-phase fault display lamp for indicating described under-voltage fault.

This time-delay relay also includes: accessory power supply, the DC/DC changer (that is: DC voltage converter) being connected with this accessory power supply, the reference voltage circuit that is connected with DC/DC changer；The reference voltage output end of this reference voltage circuit is connected with the reference voltage input of described computing comparator testing circuit.The DC output end of DC/DC changer is also connected with the internal work power supply of time-delay relay.

The panel of described time-delay relay is provided with the three-phase operation display lamp of the running status indicating described three phase mains.

Described timing controller includes: enumerator that 0.1S time-base generator, outfan with this 0.1S time-base generator are connected and by the deferred action signal relay J2 of this counter controls；The timing of under-voltage output circuit triggers signal output part and is connected with the triggering signal input part of 0.1S time-base generator, the contact of deferred action signal relay J2 is connected with deferred action signal contact, and the snap action signal output part (i.e. the contact of snap action signal relay J1) of described under-voltage output circuit is connected with snap action signal contact.

When being applied to three-phase alternating voltage monitoring, A, B, C, N in Fig. 3 is accessed the three-phase alternating voltage needing monitoring, DC source is accessed at the two ends of Uf, then A, B, C three-phase alternating voltage is sampled, the three-phase alternating voltage that sampling is come by computing comparator U1, U2 and U3 compares with preset reference voltage respectively, if each phase voltage is normal, then on panel, indicate each phase voltage running status；As detected under-voltage, on panel, then indicate each phase voltage abnormality, and drive snap action signal relay J1, output remote signalling snap action signal to snap action signal contact 8, trigger 0.1S time-base generator U5 simultaneously, and make enumerator U6 carry out timing, if false voltage does not recover, and reach deferred action signal relay J2 action after the delay time adjusted, export remote signalling deferred action signal to deferred action signal contact contact 9.

Obviously, above-described embodiment is only for clearly demonstrating example of the present invention, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here without also cannot all of embodiment be given exhaustive.And the apparent change that these spirit belonging to the present invention are extended out or variation are still among protection scope of the present invention.

Claims

null1. a time-delay relay，It is characterized in that including: the voltage sample circuit being connected with three phase mains、Be connected with voltage sample circuit for comparing sampled voltage and preset reference voltage, to determine, whether tested three phase mains under-voltage or the computing comparator testing circuit of open-phase fault、The under-voltage output circuit for exporting remote signalling snap action signal when recording under-voltage fault being connected with computing comparator testing circuit、The timing controller for exporting remote signalling deferred action signal after the under-voltage time of described under-voltage fault reaches the time delay set that signal output part is connected is triggered with the timing of under-voltage output circuit、Accessory power supply、The DC/DC changer being connected with this accessory power supply、The reference voltage circuit being connected with DC/DC changer，The reference voltage output end of this reference voltage circuit is connected with the reference voltage input of described computing comparator testing circuit；

Described timing controller includes: enumerator that 0.1S time-base generator, outfan with this 0.1S time-base generator are connected and by the deferred action signal relay of this counter controls；The timing of under-voltage output circuit triggers signal output part and is connected with the triggering signal input part of 0.1S time-base generator, the contact of deferred action signal relay is connected with deferred action signal contact, and the snap action signal output part of described under-voltage output circuit is connected with snap action signal contact；；

The panel of described time-delay relay is provided with the three-phase operation display lamp of the running status indicating described three phase mains；

When described time-delay relay is applied to three-phase alternating voltage monitoring, the three-phase alternating voltage that sampling is come by computing comparator testing circuit compares with preset reference voltage respectively, if each phase voltage is normal, then indicates each phase voltage running status on panel.