1, the principle of action
Inductive overcurrent relays use the secondary current of the current transformer to generate a magnetic field within the relay to force the disk to rotate, but the current flowing through it must be greater than the current of the current setting plate in order to rotate.
2, overvoltage relay <br> <br> overvoltage relay, referred to as the OV, its main purpose is that when the system is abnormal voltage increases to 120% above the rated value, the overvoltage protection relay trip the circuit breaker electrical equipment Protected from damage, the structure and operation principle of the inductive overvoltage relay are similar to those of the overcurrent relay. Only the main coil is different.
3, under voltage relay <br> <br> under voltage relay, referred to as UV, configured the same as the overvoltage relay, except that the inner contact and the wheel will turn immediately when the applied voltage.
4, the ground overvoltage relay <br> <br> ground overvoltage relay, referred OVG, said ground or alarm relay referred GR, which had the same configuration as voltage relays, using a non-grounded phase three-wire system, a ground connected to open delta The grounding transformer is used to detect the zero-phase voltage.
5, the ground overcurrent relay <br> <br> ground overcurrent relay, referred to the GCR, ground fault protection relay is a high-pressure line.
The main purpose:
1) Grounding over-current protection of high-resistance grounding system;
2) Generator stator winding ground protection;
3) Interphase short-circuit protection of phase-separated generators;
4) Overheat protection of grounding transformer.
6, selective ground relay <br> <br> selective ground relay, referred to as SG, also known as the directional ground relay, abbreviated DG, grounding system for use in a non-protective effect of distribution lines, overhead lines and cable systems can also be used .
Selective grounding relay: zero phase sequence current detected by the ground voltage transformer. When the line is grounded, the selective grounding relay can reliably indicate the fault line and generate an alarm, and select the fault line to disconnect it according to its needs, and continue Send power to normal lines.
7, the relay phase <br> <br> phase relays, referred to the OPR, or phase protection relay, referred to the PHR, the three-phase lines, with a supply terminal when the line disconnection caused by a single phase, if not immediately have When the line is cut off, the motor will be single-phase operation and burned.
8, the ratio differential relay <br> <br> ratio differential relays, referred to as the RDR, is applied to make the alternating current motor transformer differential protection alternator, conventionally used overcurrent protection relays, is generated by an external fault When the abnormal current flows through the protection device, if the transformer, the current on the primary and secondary sides is unbalanced or the characteristics of the current transformer are inconsistent, under these circumstances, this phenomenon will be extended several times, and the relay will malfunction.
Low carbon USS flat washers, typically used with Grade 8 or hardened steel bolting, are used under bolt heads or nuts to increase the bearing surface area, or to offer protection so that the nut or bolt can be rotated without distortion of the bearing surface. Flat washers are also used to give tightness to a joint, to prevent leakage, and especially to distribute pressure under the head of a bolt or nut. Dimensional specifications are governed by ASME B18.21.1. USS (United States Standard) flat washers have a larger outer diameter than SAE (Society of Automotive Engineers) flat washers, and can be utilized in nearly any application. ASTM F844 covers the standard specifications for unhardened steel flat washers for general use. Available in zinc plated finish. Zinc plating sacrifices itself, corroding before the base material, offering added corrosion resistance.
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